* [PATCH v3 01/10] mtrace: Deprecate mallwatch and tr_break
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 02/10] Add mcheck tests to malloc Siddhesh Poyarekar
` (8 subsequent siblings)
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
The variable and function pair appear to provide a way for users to
set conditional breakpoints in mtrace when a specific address is
returned by the allocator. This can be achieved by using conditional
breakpoints in gdb so it is redundant. There is no documentation of
this interface in the manual either, so it appears to have been a hack
that got added to debug malloc. Deprecate these symbols and do not
call tr_break anymore.
Reviewed-by: DJ Delorie <dj@redhat.com>
---
NEWS | 4 ++++
malloc/mtrace.c | 57 +++++++++++++++++--------------------------------
2 files changed, 24 insertions(+), 37 deletions(-)
diff --git a/NEWS b/NEWS
index 60933bd975..8e72946c3f 100644
--- a/NEWS
+++ b/NEWS
@@ -93,6 +93,10 @@ Deprecated and removed features, and other changes affecting compatibility:
package managers that delete removed files late during the package
upgrade or downgrade process.
+* The symbols mallwatch and tr_break are now deprecated and no longer used in
+ mtrace. Similar functionality can be achieved by using conditional
+ breakpoints within mtrace functions from within gdb.
+
Changes to build and runtime requirements:
* On Linux, the shm_open, sem_open, and related functions now expect the
diff --git a/malloc/mtrace.c b/malloc/mtrace.c
index b65b21a933..6c2c58b706 100644
--- a/malloc/mtrace.c
+++ b/malloc/mtrace.c
@@ -50,8 +50,25 @@ static char *malloc_trace_buffer;
__libc_lock_define_initialized (static, lock);
-/* Address to breakpoint on accesses to... */
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
+/* Compatibility symbols that were introduced to help break at allocation sites
+ for specific memory allocations. This is unusable with ASLR, although gdb
+ may allow predictable allocation addresses. Even then, gdb has watchpoint
+ and conditional breakpoint support which should provide the same
+ functionality without having this kludge. These symbols are preserved in
+ case some applications ended up linking against them but they don't actually
+ do anything anymore; not that they did much before anyway. */
+
void *mallwatch;
+compat_symbol (libc, mallwatch, mallwatch, GLIBC_2_0);
+
+void
+tr_break (void)
+{
+}
+compat_symbol (libc, tr_break, tr_break, GLIBC_2_0);
+#endif
+
/* Old hook values. */
static void (*tr_old_free_hook) (void *ptr, const void *);
@@ -61,19 +78,6 @@ static void *(*tr_old_realloc_hook) (void *ptr, size_t size,
static void *(*tr_old_memalign_hook) (size_t __alignment, size_t __size,
const void *);
-/* This function is called when the block being alloc'd, realloc'd, or
- freed has an address matching the variable "mallwatch". In a debugger,
- set "mallwatch" to the address of interest, then put a breakpoint on
- tr_break. */
-
-extern void tr_break (void) __THROW;
-libc_hidden_proto (tr_break)
-void
-tr_break (void)
-{
-}
-libc_hidden_def (tr_break)
-
static void
tr_where (const void *caller, Dl_info *info)
{
@@ -167,12 +171,6 @@ tr_freehook (void *ptr, const void *caller)
tr_where (caller, info);
/* Be sure to print it first. */
fprintf (mallstream, "- %p\n", ptr);
- if (ptr == mallwatch)
- {
- __libc_lock_unlock (lock);
- tr_break ();
- __libc_lock_lock (lock);
- }
set_default_hooks ();
if (tr_old_free_hook != NULL)
(*tr_old_free_hook)(ptr, caller);
@@ -203,9 +201,6 @@ tr_mallochook (size_t size, const void *caller)
__libc_lock_unlock (lock);
- if (hdr == mallwatch)
- tr_break ();
-
return hdr;
}
@@ -214,9 +209,6 @@ tr_reallochook (void *ptr, size_t size, const void *caller)
{
void *hdr;
- if (ptr == mallwatch)
- tr_break ();
-
Dl_info mem;
Dl_info *info = lock_and_info (caller, &mem);
@@ -247,9 +239,6 @@ tr_reallochook (void *ptr, size_t size, const void *caller)
__libc_lock_unlock (lock);
- if (hdr == mallwatch)
- tr_break ();
-
return hdr;
}
@@ -274,9 +263,6 @@ tr_memalignhook (size_t alignment, size_t size, const void *caller)
__libc_lock_unlock (lock);
- if (hdr == mallwatch)
- tr_break ();
-
return hdr;
}
@@ -296,10 +282,7 @@ release_libc_mem (void)
#endif
-/* We enable tracing if either the environment variable MALLOC_TRACE
- is set, or if the variable mallwatch has been patched to an address
- that the debugging user wants us to stop on. When patching mallwatch,
- don't forget to set a breakpoint on tr_break! */
+/* We enable tracing if the environment variable MALLOC_TRACE is set. */
void
mtrace (void)
@@ -321,7 +304,7 @@ mtrace (void)
#else
mallfile = getenv (mallenv);
#endif
- if (mallfile != NULL || mallwatch != NULL)
+ if (mallfile != NULL)
{
char *mtb = malloc (TRACE_BUFFER_SIZE);
if (mtb == NULL)
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* [PATCH v3 02/10] Add mcheck tests to malloc
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 01/10] mtrace: Deprecate mallwatch and tr_break Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-06 14:50 ` Stefan Liebler
2021-07-02 2:35 ` [PATCH v3 03/10] Move glibc.malloc.check implementation into its own file Siddhesh Poyarekar
` (7 subsequent siblings)
9 siblings, 1 reply; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Like malloc-check, add generic rules to run all tests in malloc by
linking with libmcheck.a so as to provide coverage for mcheck().
Currently the following 12 tests fail:
FAIL: malloc/tst-malloc-backtrace-mcheck
FAIL: malloc/tst-malloc-fork-deadlock-mcheck
FAIL: malloc/tst-malloc-stats-cancellation-mcheck
FAIL: malloc/tst-malloc-tcache-leak-mcheck
FAIL: malloc/tst-malloc-thread-exit-mcheck
FAIL: malloc/tst-malloc-thread-fail-mcheck
FAIL: malloc/tst-malloc-usable-static-mcheck
FAIL: malloc/tst-malloc-usable-static-tunables-mcheck
FAIL: malloc/tst-malloc-usable-tunables-mcheck
FAIL: malloc/tst-malloc_info-mcheck
FAIL: malloc/tst-memalign-mcheck
FAIL: malloc/tst-posix_memalign-mcheck
and they have been added to tests-exclude-mcheck for now to keep
status quo. At least the last two can be attributed to bugs in
mcheck() but I haven't fixed them here since they should be fixed by
removing malloc hooks. Others need to be triaged to check if they're
due to mcheck bugs or due to actual bugs.
Reviewed-by: DJ Delorie <dj@redhat.com>
---
Rules | 15 ++++++++++++++-
malloc/Makefile | 35 +++++++++++++++++++++++++++++++++++
2 files changed, 49 insertions(+), 1 deletion(-)
diff --git a/Rules b/Rules
index c6b635c3f7..ba13598df6 100644
--- a/Rules
+++ b/Rules
@@ -155,6 +155,7 @@ xtests: tests $(xtests-special)
else
tests: $(tests:%=$(objpfx)%.out) $(tests-internal:%=$(objpfx)%.out) \
$(tests-container:%=$(objpfx)%.out) \
+ $(tests-mcheck:%=$(objpfx)%-mcheck.out) \
$(tests-malloc-check:%=$(objpfx)%-malloc-check.out) \
$(tests-special) $(tests-printers-out)
xtests: tests $(xtests:%=$(objpfx)%.out) $(xtests-special)
@@ -166,7 +167,8 @@ ifeq ($(run-built-tests),no)
tests-expected =
else
tests-expected = $(tests) $(tests-internal) $(tests-printers) \
- $(tests-container) $(tests-malloc-check:%=%-malloc-check)
+ $(tests-container) $(tests-malloc-check:%=%-malloc-check) \
+ $(tests-mcheck:%=%-mcheck)
endif
tests:
$(..)scripts/merge-test-results.sh -s $(objpfx) $(subdir) \
@@ -192,6 +194,7 @@ else
binaries-pie-tests =
binaries-pie-notests =
endif
+binaries-mcheck-tests = $(tests-mcheck:%=%-mcheck)
binaries-malloc-check-tests = $(tests-malloc-check:%=%-malloc-check)
else
binaries-all-notests =
@@ -202,6 +205,7 @@ binaries-static-tests =
binaries-static =
binaries-pie-tests =
binaries-pie-notests =
+binaries-mcheck-tests =
binaries-malloc-check-tests =
endif
@@ -226,6 +230,15 @@ $(addprefix $(objpfx),$(binaries-shared-tests)): %: %.o \
$(+link-tests)
endif
+ifneq "$(strip $(binaries-mcheck-tests))" ""
+$(addprefix $(objpfx),$(binaries-mcheck-tests)): %-mcheck: %.o \
+ $(link-extra-libs-tests) \
+ $(sort $(filter $(common-objpfx)lib%,$(link-libc))) \
+ $(common-objpfx)malloc/libmcheck.a \
+ $(addprefix $(csu-objpfx),start.o) $(+preinit) $(+postinit)
+ $(+link-tests)
+endif
+
ifneq "$(strip $(binaries-malloc-check-tests))" ""
$(addprefix $(objpfx),$(binaries-malloc-check-tests)): %-malloc-check: %.o \
$(link-extra-libs-tests) \
diff --git a/malloc/Makefile b/malloc/Makefile
index 9bc2e50a9a..c8256abbbf 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -77,6 +77,26 @@ tests-exclude-malloc-check = tst-malloc-check tst-malloc-usable \
# Run all tests with MALLOC_CHECK_=3
tests-malloc-check = $(filter-out $(tests-exclude-malloc-check),$(tests))
+# Tests that don't play well with mcheck. They are either bugs in mcheck or
+# the tests expect specific internal behavior that is changed due to linking to
+# libmcheck.a.
+tests-exclude-mcheck = tst-mallocstate \
+ tst-safe-linking tst-malloc-usable \
+ tst-malloc-backtrace \
+ tst-malloc-fork-deadlock \
+ tst-malloc-stats-cancellation \
+ tst-malloc-tcache-leak \
+ tst-malloc-thread-exit \
+ tst-malloc-thread-fail \
+ tst-malloc-usable-static \
+ tst-malloc-usable-static-tunables \
+ tst-malloc-usable-tunables \
+ tst-malloc_info \
+ tst-memalign \
+ tst-posix_memalign
+
+tests-mcheck = $(filter-out $(tests-exclude-mcheck), $(tests))
+
routines = malloc morecore mcheck mtrace obstack reallocarray \
scratch_buffer_dupfree \
scratch_buffer_grow scratch_buffer_grow_preserve \
@@ -118,6 +138,11 @@ $(objpfx)tst-mallocfork3: $(shared-thread-library)
$(objpfx)tst-mallocfork3-mcheck: $(shared-thread-library)
$(objpfx)tst-malloc-fork-deadlock: $(shared-thread-library)
$(objpfx)tst-malloc-stats-cancellation: $(shared-thread-library)
+$(objpfx)tst-malloc-backtrace-mcheck: $(shared-thread-library)
+$(objpfx)tst-malloc-thread-exit-mcheck: $(shared-thread-library)
+$(objpfx)tst-malloc-thread-fail-mcheck: $(shared-thread-library)
+$(objpfx)tst-malloc-fork-deadlock-mcheck: $(shared-thread-library)
+$(objpfx)tst-malloc-stats-cancellation-mcheck: $(shared-thread-library)
$(objpfx)tst-malloc-backtrace-malloc-check: $(shared-thread-library)
$(objpfx)tst-malloc-thread-exit-malloc-check: $(shared-thread-library)
$(objpfx)tst-malloc-thread-fail-malloc-check: $(shared-thread-library)
@@ -253,17 +278,24 @@ $(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c
$(tests:%=$(objpfx)%.o): CPPFLAGS += -DTEST_NO_MALLOPT
$(objpfx)tst-interpose-nothread: $(objpfx)tst-interpose-aux-nothread.o
+$(objpfx)tst-interpose-nothread-mcheck: $(objpfx)tst-interpose-aux-nothread.o
$(objpfx)tst-interpose-nothread-malloc-check: \
$(objpfx)tst-interpose-aux-nothread.o
$(objpfx)tst-interpose-thread: \
$(objpfx)tst-interpose-aux-thread.o $(shared-thread-library)
+$(objpfx)tst-interpose-thread-mcheck: \
+ $(objpfx)tst-interpose-aux-thread.o $(shared-thread-library)
$(objpfx)tst-interpose-thread-malloc-check: \
$(objpfx)tst-interpose-aux-thread.o $(shared-thread-library)
$(objpfx)tst-interpose-static-nothread: $(objpfx)tst-interpose-aux-nothread.o
+$(objpfx)tst-interpose-static-nothread-mcheck: \
+ $(objpfx)tst-interpose-aux-nothread.o
$(objpfx)tst-interpose-static-nothread-malloc-check: \
$(objpfx)tst-interpose-aux-nothread.o
$(objpfx)tst-interpose-static-thread: \
$(objpfx)tst-interpose-aux-thread.o $(static-thread-library)
+$(objpfx)tst-interpose-static-thread-mcheck: \
+ $(objpfx)tst-interpose-aux-thread.o $(static-thread-library)
$(objpfx)tst-interpose-static-thread-malloc-check: \
$(objpfx)tst-interpose-aux-thread.o $(static-thread-library)
@@ -280,6 +312,9 @@ $(objpfx)tst-dynarray-fail-mem.out: $(objpfx)tst-dynarray-fail.out
$(objpfx)tst-malloc-tcache-leak: $(shared-thread-library)
$(objpfx)tst-malloc_info: $(shared-thread-library)
$(objpfx)tst-mallocfork2: $(shared-thread-library)
+$(objpfx)tst-malloc-tcache-leak-mcheck: $(shared-thread-library)
+$(objpfx)tst-malloc_info-mcheck: $(shared-thread-library)
+$(objpfx)tst-mallocfork2-mcheck: $(shared-thread-library)
$(objpfx)tst-malloc-tcache-leak-malloc-check: $(shared-thread-library)
$(objpfx)tst-malloc_info-malloc-check: $(shared-thread-library)
$(objpfx)tst-mallocfork2-malloc-check: $(shared-thread-library)
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3 02/10] Add mcheck tests to malloc
2021-07-02 2:35 ` [PATCH v3 02/10] Add mcheck tests to malloc Siddhesh Poyarekar
@ 2021-07-06 14:50 ` Stefan Liebler
2021-07-06 15:54 ` Siddhesh Poyarekar
0 siblings, 1 reply; 28+ messages in thread
From: Stefan Liebler @ 2021-07-06 14:50 UTC (permalink / raw)
To: libc-alpha
On 02/07/2021 04:35, Siddhesh Poyarekar via Libc-alpha wrote:
> Like malloc-check, add generic rules to run all tests in malloc by
> linking with libmcheck.a so as to provide coverage for mcheck().
> Currently the following 12 tests fail:
>
> FAIL: malloc/tst-malloc-backtrace-mcheck
> FAIL: malloc/tst-malloc-fork-deadlock-mcheck
> FAIL: malloc/tst-malloc-stats-cancellation-mcheck
> FAIL: malloc/tst-malloc-tcache-leak-mcheck
> FAIL: malloc/tst-malloc-thread-exit-mcheck
> FAIL: malloc/tst-malloc-thread-fail-mcheck
> FAIL: malloc/tst-malloc-usable-static-mcheck
> FAIL: malloc/tst-malloc-usable-static-tunables-mcheck
> FAIL: malloc/tst-malloc-usable-tunables-mcheck
> FAIL: malloc/tst-malloc_info-mcheck
> FAIL: malloc/tst-memalign-mcheck
> FAIL: malloc/tst-posix_memalign-mcheck
>
> and they have been added to tests-exclude-mcheck for now to keep
> status quo. At least the last two can be attributed to bugs in
> mcheck() but I haven't fixed them here since they should be fixed by
> removing malloc hooks. Others need to be triaged to check if they're
> due to mcheck bugs or due to actual bugs.
>
> Reviewed-by: DJ Delorie <dj@redhat.com>
Hi Siddhesh,
starting with this commit, malloc/tst-realloc-mcheck fails if build with
gcc 7.5 on s390x:
Error: realloc (NULL, 0) returned NULL.
With gcc 7.5:
p = realloc (NULL, 0);
realloc is really called, which is using reallochook, which always
returns NULL:
static void *
reallochook (void *ptr, size_t size, const void *caller)
{
if (size == 0)
{
freehook (ptr, caller);
return NULL;
}
With e.g. gcc 9.1:
malloc(0) is called, which is using mallochook. It is using
hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1);
...
return (void *) (hdr + 1);
=> != NULL
Can you please have a look? And perhaps also filter out this test?
Bye,
Stefan
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3 02/10] Add mcheck tests to malloc
2021-07-06 14:50 ` Stefan Liebler
@ 2021-07-06 15:54 ` Siddhesh Poyarekar
2021-07-08 23:37 ` H.J. Lu
0 siblings, 1 reply; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-06 15:54 UTC (permalink / raw)
To: Stefan Liebler, libc-alpha
On 7/6/21 8:20 PM, Stefan Liebler via Libc-alpha wrote:
> Hi Siddhesh,
>
> starting with this commit, malloc/tst-realloc-mcheck fails if build with
> gcc 7.5 on s390x:
> Error: realloc (NULL, 0) returned NULL.
>
> With gcc 7.5:
> p = realloc (NULL, 0);
> realloc is really called, which is using reallochook, which always
> returns NULL:
> static void *
> reallochook (void *ptr, size_t size, const void *caller)
> {
> if (size == 0)
> {
> freehook (ptr, caller);
> return NULL;
> }
>
> With e.g. gcc 9.1:
> malloc(0) is called, which is using mallochook. It is using
> hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1);
> ...
> return (void *) (hdr + 1);
> => != NULL
>
> Can you please have a look? And perhaps also filter out this test?
Thanks, that is an mcheck bug that gcc seems to have masked. I'll push
a patch filter it out. I'll also need to update my hooks patch to fix
this bug in mcheck.
Thanks,
Siddhesh
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3 02/10] Add mcheck tests to malloc
2021-07-06 15:54 ` Siddhesh Poyarekar
@ 2021-07-08 23:37 ` H.J. Lu
2021-07-09 0:06 ` H.J. Lu
0 siblings, 1 reply; 28+ messages in thread
From: H.J. Lu @ 2021-07-08 23:37 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: Stefan Liebler, GNU C Library
On Tue, Jul 6, 2021 at 8:54 AM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>
> On 7/6/21 8:20 PM, Stefan Liebler via Libc-alpha wrote:
> > Hi Siddhesh,
> >
> > starting with this commit, malloc/tst-realloc-mcheck fails if build with
> > gcc 7.5 on s390x:
> > Error: realloc (NULL, 0) returned NULL.
> >
> > With gcc 7.5:
> > p = realloc (NULL, 0);
> > realloc is really called, which is using reallochook, which always
> > returns NULL:
> > static void *
> > reallochook (void *ptr, size_t size, const void *caller)
> > {
> > if (size == 0)
> > {
> > freehook (ptr, caller);
> > return NULL;
> > }
> >
> > With e.g. gcc 9.1:
> > malloc(0) is called, which is using mallochook. It is using
> > hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1);
> > ...
> > return (void *) (hdr + 1);
> > => != NULL
> >
> > Can you please have a look? And perhaps also filter out this test?
>
> Thanks, that is an mcheck bug that gcc seems to have masked. I'll push
> a patch filter it out. I'll also need to update my hooks patch to fix
> this bug in mcheck.
>
> Thanks,
> Siddhesh
It also caused:
https://sourceware.org/bugzilla/show_bug.cgi?id=28068
on x32.
--
H.J.
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3 02/10] Add mcheck tests to malloc
2021-07-08 23:37 ` H.J. Lu
@ 2021-07-09 0:06 ` H.J. Lu
2021-07-09 1:46 ` Siddhesh Poyarekar
0 siblings, 1 reply; 28+ messages in thread
From: H.J. Lu @ 2021-07-09 0:06 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: Stefan Liebler, GNU C Library
On Thu, Jul 8, 2021 at 4:37 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Tue, Jul 6, 2021 at 8:54 AM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
> >
> > On 7/6/21 8:20 PM, Stefan Liebler via Libc-alpha wrote:
> > > Hi Siddhesh,
> > >
> > > starting with this commit, malloc/tst-realloc-mcheck fails if build with
> > > gcc 7.5 on s390x:
> > > Error: realloc (NULL, 0) returned NULL.
> > >
> > > With gcc 7.5:
> > > p = realloc (NULL, 0);
> > > realloc is really called, which is using reallochook, which always
> > > returns NULL:
> > > static void *
> > > reallochook (void *ptr, size_t size, const void *caller)
> > > {
> > > if (size == 0)
> > > {
> > > freehook (ptr, caller);
> > > return NULL;
> > > }
> > >
> > > With e.g. gcc 9.1:
> > > malloc(0) is called, which is using mallochook. It is using
> > > hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1);
> > > ...
> > > return (void *) (hdr + 1);
> > > => != NULL
> > >
> > > Can you please have a look? And perhaps also filter out this test?
> >
> > Thanks, that is an mcheck bug that gcc seems to have masked. I'll push
> > a patch filter it out. I'll also need to update my hooks patch to fix
> > this bug in mcheck.
> >
> > Thanks,
> > Siddhesh
>
> It also caused:
>
> https://sourceware.org/bugzilla/show_bug.cgi?id=28068
>
> on x32.
mcheck.c doesn't take MALLOC_ALIGNMENT into account. Will it be removed
or fixed?
--
H.J.
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3 02/10] Add mcheck tests to malloc
2021-07-09 0:06 ` H.J. Lu
@ 2021-07-09 1:46 ` Siddhesh Poyarekar
2021-07-09 3:53 ` [PATCH] Add a generic malloc test for MALLOC_ALIGNMENT H.J. Lu
2021-07-12 18:02 ` [PATCH v3 02/10] Add mcheck tests to malloc Matheus Castanho
0 siblings, 2 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-09 1:46 UTC (permalink / raw)
To: H.J. Lu; +Cc: Stefan Liebler, GNU C Library
On 7/9/21 5:36 AM, H.J. Lu wrote:
>> It also caused:
>>
>> https://sourceware.org/bugzilla/show_bug.cgi?id=28068
>>
>> on x32.
>
> mcheck.c doesn't take MALLOC_ALIGNMENT into account. Will it be removed
> or fixed?
Very interesting, I think it's best to exclude the test for mcheck on
x32 for now. I'll fix mcheck once the malloc hooks patchset[1] is in.
On a separate note, this test probably deserves to be run on all
architectures for MALLOC_ALIGNMENT.
Siddhesh
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH] Add a generic malloc test for MALLOC_ALIGNMENT
2021-07-09 1:46 ` Siddhesh Poyarekar
@ 2021-07-09 3:53 ` H.J. Lu
2021-07-09 4:07 ` Siddhesh Poyarekar
2021-07-12 18:02 ` [PATCH v3 02/10] Add mcheck tests to malloc Matheus Castanho
1 sibling, 1 reply; 28+ messages in thread
From: H.J. Lu @ 2021-07-09 3:53 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: Stefan Liebler, GNU C Library
[-- Attachment #1: Type: text/plain, Size: 604 bytes --]
On Thu, Jul 8, 2021 at 6:46 PM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>
> On 7/9/21 5:36 AM, H.J. Lu wrote:
> >> It also caused:
> >>
> >> https://sourceware.org/bugzilla/show_bug.cgi?id=28068
> >>
> >> on x32.
> >
> > mcheck.c doesn't take MALLOC_ALIGNMENT into account. Will it be removed
> > or fixed?
>
> Very interesting, I think it's best to exclude the test for mcheck on
> x32 for now. I'll fix mcheck once the malloc hooks patchset[1] is in.
>
> On a separate note, this test probably deserves to be run on all
> architectures for MALLOC_ALIGNMENT.
>
> Siddhesh
Like this?
--
H.J.
[-- Attachment #2: 0001-Add-a-generic-malloc-test-for-MALLOC_ALIGNMENT.patch --]
[-- Type: text/x-patch, Size: 8980 bytes --]
From dfe77e157c8edc48a27b7c72c880b2a0d8a9859a Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Thu, 8 Jul 2021 20:48:14 -0700
Subject: [PATCH] Add a generic malloc test for MALLOC_ALIGNMENT
1. Add sysdeps/generic/malloc-size.h to define size related macros for
malloc.
2. Move x86_64/tst-mallocalign1.c malloc and replace ALIGN_MASK with
MALLOC_ALIGN_MASK.
---
malloc/Makefile | 1 +
malloc/malloc-internal.h | 41 +-----------
{sysdeps/x86_64 => malloc}/tst-mallocalign1.c | 28 ++++----
sysdeps/generic/malloc-machine.h | 1 -
sysdeps/generic/malloc-size.h | 65 +++++++++++++++++++
sysdeps/x86_64/Makefile | 4 --
6 files changed, 80 insertions(+), 60 deletions(-)
rename {sysdeps/x86_64 => malloc}/tst-mallocalign1.c (69%)
create mode 100644 sysdeps/generic/malloc-size.h
diff --git a/malloc/Makefile b/malloc/Makefile
index 37a9a4efab..b685ed6d61 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
tst-malloc-stats-cancellation \
tst-tcfree1 tst-tcfree2 tst-tcfree3 \
tst-safe-linking \
+ tst-mallocalign1 \
tests-static := \
tst-interpose-static-nothread \
diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h
index 258f29584e..0c7b5a183c 100644
--- a/malloc/malloc-internal.h
+++ b/malloc/malloc-internal.h
@@ -21,46 +21,7 @@
#include <malloc-machine.h>
#include <malloc-sysdep.h>
-
-/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
- chunk sizes.
-
- The default version is the same as size_t.
-
- While not strictly necessary, it is best to define this as an
- unsigned type, even if size_t is a signed type. This may avoid some
- artificial size limitations on some systems.
-
- On a 64-bit machine, you may be able to reduce malloc overhead by
- defining INTERNAL_SIZE_T to be a 32 bit `unsigned int' at the
- expense of not being able to handle more than 2^32 of malloced
- space. If this limitation is acceptable, you are encouraged to set
- this unless you are on a platform requiring 16byte alignments. In
- this case the alignment requirements turn out to negate any
- potential advantages of decreasing size_t word size.
-
- Implementors: Beware of the possible combinations of:
- - INTERNAL_SIZE_T might be signed or unsigned, might be 32 or 64 bits,
- and might be the same width as int or as long
- - size_t might have different width and signedness as INTERNAL_SIZE_T
- - int and long might be 32 or 64 bits, and might be the same width
-
- To deal with this, most comparisons and difference computations
- among INTERNAL_SIZE_Ts should cast them to unsigned long, being
- aware of the fact that casting an unsigned int to a wider long does
- not sign-extend. (This also makes checking for negative numbers
- awkward.) Some of these casts result in harmless compiler warnings
- on some systems. */
-#ifndef INTERNAL_SIZE_T
-# define INTERNAL_SIZE_T size_t
-#endif
-
-/* The corresponding word size. */
-#define SIZE_SZ (sizeof (INTERNAL_SIZE_T))
-
-/* The corresponding bit mask value. */
-#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
-
+#include <malloc-size.h>
/* Called in the parent process before a fork. */
void __malloc_fork_lock_parent (void) attribute_hidden;
diff --git a/sysdeps/x86_64/tst-mallocalign1.c b/malloc/tst-mallocalign1.c
similarity index 69%
rename from sysdeps/x86_64/tst-mallocalign1.c
rename to malloc/tst-mallocalign1.c
index 33a6375777..d0c66e435c 100644
--- a/sysdeps/x86_64/tst-mallocalign1.c
+++ b/malloc/tst-mallocalign1.c
@@ -17,17 +17,16 @@
#include <stdio.h>
#include <stdlib.h>
+#include <inttypes.h>
+#include <malloc-size.h>
-/* Specified by x86-64 psABI. */
-#define ALIGN_MASK (16 - 1)
-
-void *
+static void *
test (size_t s)
{
void *p = malloc (s);
- printf ("malloc: %ld, %p: %ld\n", (unsigned long) s, p,
- ((unsigned long) p) & ALIGN_MASK);
+ printf ("malloc: %zu, %p: %zu\n", s, p,
+ ((uintptr_t) p) & MALLOC_ALIGN_MASK);
return p;
}
@@ -38,35 +37,34 @@ do_test (void)
int ret = 0;
p = test (2);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (8);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (13);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (16);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (23);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (43);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (123);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
return ret;
}
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
+#include <support/test-driver.c>
diff --git a/sysdeps/generic/malloc-machine.h b/sysdeps/generic/malloc-machine.h
index a71f2361f5..121d8ad0c9 100644
--- a/sysdeps/generic/malloc-machine.h
+++ b/sysdeps/generic/malloc-machine.h
@@ -21,7 +21,6 @@
#define _GENERIC_MALLOC_MACHINE_H
#include <atomic.h>
-#include <malloc-alignment.h>
#ifndef atomic_full_barrier
# define atomic_full_barrier() __asm ("" ::: "memory")
diff --git a/sysdeps/generic/malloc-size.h b/sysdeps/generic/malloc-size.h
new file mode 100644
index 0000000000..7605fe961e
--- /dev/null
+++ b/sysdeps/generic/malloc-size.h
@@ -0,0 +1,65 @@
+/* Define INTERNAL_SIZE_T, SIZE_SZ, MALLOC_ALIGNMENT and MALLOC_ALIGN_MASK
+ for malloc.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _GENERIC_MALLOC_SIZE_H
+#define _GENERIC_MALLOC_SIZE_H
+
+#include <malloc-alignment.h>
+
+/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
+ chunk sizes.
+
+ The default version is the same as size_t.
+
+ While not strictly necessary, it is best to define this as an
+ unsigned type, even if size_t is a signed type. This may avoid some
+ artificial size limitations on some systems.
+
+ On a 64-bit machine, you may be able to reduce malloc overhead by
+ defining INTERNAL_SIZE_T to be a 32 bit `unsigned int' at the
+ expense of not being able to handle more than 2^32 of malloced
+ space. If this limitation is acceptable, you are encouraged to set
+ this unless you are on a platform requiring 16byte alignments. In
+ this case the alignment requirements turn out to negate any
+ potential advantages of decreasing size_t word size.
+
+ Implementors: Beware of the possible combinations of:
+ - INTERNAL_SIZE_T might be signed or unsigned, might be 32 or 64 bits,
+ and might be the same width as int or as long
+ - size_t might have different width and signedness as INTERNAL_SIZE_T
+ - int and long might be 32 or 64 bits, and might be the same width
+
+ To deal with this, most comparisons and difference computations
+ among INTERNAL_SIZE_Ts should cast them to unsigned long, being
+ aware of the fact that casting an unsigned int to a wider long does
+ not sign-extend. (This also makes checking for negative numbers
+ awkward.) Some of these casts result in harmless compiler warnings
+ on some systems. */
+#ifndef INTERNAL_SIZE_T
+# define INTERNAL_SIZE_T size_t
+#endif
+
+/* The corresponding word size. */
+#define SIZE_SZ (sizeof (INTERNAL_SIZE_T))
+
+/* The corresponding bit mask value. */
+#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
+
+
+#endif /* _GENERIC_MALLOC_SIZE_H */
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 3fc03f4a19..22c5b63ab5 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -13,10 +13,6 @@ sysdep_routines += _mcount
sysdep_noprof += _mcount
endif
-ifeq ($(subdir),malloc)
-tests += tst-mallocalign1
-endif
-
ifeq ($(subdir),string)
sysdep_routines += strcasecmp_l-nonascii strncase_l-nonascii
gen-as-const-headers += locale-defines.sym
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH] Add a generic malloc test for MALLOC_ALIGNMENT
2021-07-09 3:53 ` [PATCH] Add a generic malloc test for MALLOC_ALIGNMENT H.J. Lu
@ 2021-07-09 4:07 ` Siddhesh Poyarekar
2021-07-09 12:24 ` [PATCH v2] " H.J. Lu
0 siblings, 1 reply; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-09 4:07 UTC (permalink / raw)
To: H.J. Lu; +Cc: Stefan Liebler, GNU C Library
> diff --git a/malloc/Makefile b/malloc/Makefile
> index 37a9a4efab..b685ed6d61 100644
> --- a/malloc/Makefile
> +++ b/malloc/Makefile
> @@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
> tst-malloc-stats-cancellation \
> tst-tcfree1 tst-tcfree2 tst-tcfree3 \
> tst-safe-linking \
> + tst-mallocalign1 \
>
Please remove the trailing '\'. OK otherwise.
Thanks,
Siddhesh
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v2] Add a generic malloc test for MALLOC_ALIGNMENT
2021-07-09 4:07 ` Siddhesh Poyarekar
@ 2021-07-09 12:24 ` H.J. Lu
2021-07-09 13:00 ` Siddhesh Poyarekar
0 siblings, 1 reply; 28+ messages in thread
From: H.J. Lu @ 2021-07-09 12:24 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: Stefan Liebler, GNU C Library
[-- Attachment #1: Type: text/plain, Size: 915 bytes --]
On Thu, Jul 8, 2021 at 9:07 PM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>
> > diff --git a/malloc/Makefile b/malloc/Makefile
> > index 37a9a4efab..b685ed6d61 100644
> > --- a/malloc/Makefile
> > +++ b/malloc/Makefile
> > @@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
> > tst-malloc-stats-cancellation \
> > tst-tcfree1 tst-tcfree2 tst-tcfree3 \
> > tst-safe-linking \
> > + tst-mallocalign1 \
> >
>
> Please remove the trailing '\'. OK otherwise.
>
Changes in the v2 patch
1. Add a comment in malloc/tst-mallocalign1.c to indicate that it is
used to verify that MALLOC_ALIGNMENT is honored by malloc.
2. Include <malloc-alignment.h> in malloc-size.h after SIZE_SZ is
defined since <malloc-alignment.h> may use SIZE_SZ.
BTW, I kept the trailing '\' since it is used in all other places in
malloc/Makefile.
OK for master?
Thanks.
--
H.J.
[-- Attachment #2: v2-0001-Add-a-generic-malloc-test-for-MALLOC_ALIGNMENT.patch --]
[-- Type: text/x-patch, Size: 9653 bytes --]
From f538de896904ee77c17391af7007a085a40235a1 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Thu, 8 Jul 2021 20:48:14 -0700
Subject: [PATCH v2] Add a generic malloc test for MALLOC_ALIGNMENT
Changes in the v2 patch
1. Add a comment in malloc/tst-mallocalign1.c to indicate that it is
used to verify that MALLOC_ALIGNMENT is honored by malloc.
2. Include <malloc-alignment.h> in malloc-size.h after SIZE_SZ is
defined since <malloc-alignment.h> may use SIZE_SZ.
BTW, I kept the trailing '\' since it is used all other places in
malloc/Makefile.
H.J.
---
1. Add sysdeps/generic/malloc-size.h to define size related macros for
malloc.
2. Move x86_64/tst-mallocalign1.c malloc and replace ALIGN_MASK with
MALLOC_ALIGN_MASK.
---
malloc/Makefile | 1 +
malloc/malloc-internal.h | 41 +-----------
{sysdeps/x86_64 => malloc}/tst-mallocalign1.c | 31 +++++----
sysdeps/generic/malloc-machine.h | 1 -
sysdeps/generic/malloc-size.h | 64 +++++++++++++++++++
sysdeps/x86_64/Makefile | 4 --
6 files changed, 81 insertions(+), 61 deletions(-)
rename {sysdeps/x86_64 => malloc}/tst-mallocalign1.c (65%)
create mode 100644 sysdeps/generic/malloc-size.h
diff --git a/malloc/Makefile b/malloc/Makefile
index 37a9a4efab..b685ed6d61 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
tst-malloc-stats-cancellation \
tst-tcfree1 tst-tcfree2 tst-tcfree3 \
tst-safe-linking \
+ tst-mallocalign1 \
tests-static := \
tst-interpose-static-nothread \
diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h
index 258f29584e..0c7b5a183c 100644
--- a/malloc/malloc-internal.h
+++ b/malloc/malloc-internal.h
@@ -21,46 +21,7 @@
#include <malloc-machine.h>
#include <malloc-sysdep.h>
-
-/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
- chunk sizes.
-
- The default version is the same as size_t.
-
- While not strictly necessary, it is best to define this as an
- unsigned type, even if size_t is a signed type. This may avoid some
- artificial size limitations on some systems.
-
- On a 64-bit machine, you may be able to reduce malloc overhead by
- defining INTERNAL_SIZE_T to be a 32 bit `unsigned int' at the
- expense of not being able to handle more than 2^32 of malloced
- space. If this limitation is acceptable, you are encouraged to set
- this unless you are on a platform requiring 16byte alignments. In
- this case the alignment requirements turn out to negate any
- potential advantages of decreasing size_t word size.
-
- Implementors: Beware of the possible combinations of:
- - INTERNAL_SIZE_T might be signed or unsigned, might be 32 or 64 bits,
- and might be the same width as int or as long
- - size_t might have different width and signedness as INTERNAL_SIZE_T
- - int and long might be 32 or 64 bits, and might be the same width
-
- To deal with this, most comparisons and difference computations
- among INTERNAL_SIZE_Ts should cast them to unsigned long, being
- aware of the fact that casting an unsigned int to a wider long does
- not sign-extend. (This also makes checking for negative numbers
- awkward.) Some of these casts result in harmless compiler warnings
- on some systems. */
-#ifndef INTERNAL_SIZE_T
-# define INTERNAL_SIZE_T size_t
-#endif
-
-/* The corresponding word size. */
-#define SIZE_SZ (sizeof (INTERNAL_SIZE_T))
-
-/* The corresponding bit mask value. */
-#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
-
+#include <malloc-size.h>
/* Called in the parent process before a fork. */
void __malloc_fork_lock_parent (void) attribute_hidden;
diff --git a/sysdeps/x86_64/tst-mallocalign1.c b/malloc/tst-mallocalign1.c
similarity index 65%
rename from sysdeps/x86_64/tst-mallocalign1.c
rename to malloc/tst-mallocalign1.c
index 33a6375777..294e821afe 100644
--- a/sysdeps/x86_64/tst-mallocalign1.c
+++ b/malloc/tst-mallocalign1.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 2012-2021 Free Software Foundation, Inc.
+/* Verify that MALLOC_ALIGNMENT is honored by malloc.
+ Copyright (C) 2012-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -17,17 +18,16 @@
#include <stdio.h>
#include <stdlib.h>
+#include <inttypes.h>
+#include <malloc-size.h>
-/* Specified by x86-64 psABI. */
-#define ALIGN_MASK (16 - 1)
-
-void *
+static void *
test (size_t s)
{
void *p = malloc (s);
- printf ("malloc: %ld, %p: %ld\n", (unsigned long) s, p,
- ((unsigned long) p) & ALIGN_MASK);
+ printf ("malloc: %zu, %p: %zu\n", s, p,
+ ((uintptr_t) p) & MALLOC_ALIGN_MASK);
return p;
}
@@ -38,35 +38,34 @@ do_test (void)
int ret = 0;
p = test (2);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (8);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (13);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (16);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (23);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (43);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (123);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
return ret;
}
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
+#include <support/test-driver.c>
diff --git a/sysdeps/generic/malloc-machine.h b/sysdeps/generic/malloc-machine.h
index a71f2361f5..121d8ad0c9 100644
--- a/sysdeps/generic/malloc-machine.h
+++ b/sysdeps/generic/malloc-machine.h
@@ -21,7 +21,6 @@
#define _GENERIC_MALLOC_MACHINE_H
#include <atomic.h>
-#include <malloc-alignment.h>
#ifndef atomic_full_barrier
# define atomic_full_barrier() __asm ("" ::: "memory")
diff --git a/sysdeps/generic/malloc-size.h b/sysdeps/generic/malloc-size.h
new file mode 100644
index 0000000000..41901b9a44
--- /dev/null
+++ b/sysdeps/generic/malloc-size.h
@@ -0,0 +1,64 @@
+/* Define INTERNAL_SIZE_T, SIZE_SZ, MALLOC_ALIGNMENT and MALLOC_ALIGN_MASK
+ for malloc.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _GENERIC_MALLOC_SIZE_H
+#define _GENERIC_MALLOC_SIZE_H
+
+/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
+ chunk sizes.
+
+ The default version is the same as size_t.
+
+ While not strictly necessary, it is best to define this as an
+ unsigned type, even if size_t is a signed type. This may avoid some
+ artificial size limitations on some systems.
+
+ On a 64-bit machine, you may be able to reduce malloc overhead by
+ defining INTERNAL_SIZE_T to be a 32 bit `unsigned int' at the
+ expense of not being able to handle more than 2^32 of malloced
+ space. If this limitation is acceptable, you are encouraged to set
+ this unless you are on a platform requiring 16byte alignments. In
+ this case the alignment requirements turn out to negate any
+ potential advantages of decreasing size_t word size.
+
+ Implementors: Beware of the possible combinations of:
+ - INTERNAL_SIZE_T might be signed or unsigned, might be 32 or 64 bits,
+ and might be the same width as int or as long
+ - size_t might have different width and signedness as INTERNAL_SIZE_T
+ - int and long might be 32 or 64 bits, and might be the same width
+
+ To deal with this, most comparisons and difference computations
+ among INTERNAL_SIZE_Ts should cast them to unsigned long, being
+ aware of the fact that casting an unsigned int to a wider long does
+ not sign-extend. (This also makes checking for negative numbers
+ awkward.) Some of these casts result in harmless compiler warnings
+ on some systems. */
+#ifndef INTERNAL_SIZE_T
+# define INTERNAL_SIZE_T size_t
+#endif
+
+/* The corresponding word size. */
+#define SIZE_SZ (sizeof (INTERNAL_SIZE_T))
+
+#include <malloc-alignment.h>
+
+/* The corresponding bit mask value. */
+#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
+
+#endif /* _GENERIC_MALLOC_SIZE_H */
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 3fc03f4a19..22c5b63ab5 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -13,10 +13,6 @@ sysdep_routines += _mcount
sysdep_noprof += _mcount
endif
-ifeq ($(subdir),malloc)
-tests += tst-mallocalign1
-endif
-
ifeq ($(subdir),string)
sysdep_routines += strcasecmp_l-nonascii strncase_l-nonascii
gen-as-const-headers += locale-defines.sym
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v2] Add a generic malloc test for MALLOC_ALIGNMENT
2021-07-09 12:24 ` [PATCH v2] " H.J. Lu
@ 2021-07-09 13:00 ` Siddhesh Poyarekar
2021-07-09 13:31 ` [PATCH v3] " H.J. Lu
0 siblings, 1 reply; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-09 13:00 UTC (permalink / raw)
To: H.J. Lu; +Cc: Stefan Liebler, GNU C Library
On 7/9/21 5:54 PM, H.J. Lu wrote:
> On Thu, Jul 8, 2021 at 9:07 PM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>>
>>> diff --git a/malloc/Makefile b/malloc/Makefile
>>> index 37a9a4efab..b685ed6d61 100644
>>> --- a/malloc/Makefile
>>> +++ b/malloc/Makefile
>>> @@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
>>> tst-malloc-stats-cancellation \
>>> tst-tcfree1 tst-tcfree2 tst-tcfree3 \
>>> tst-safe-linking \
>>> + tst-mallocalign1 \
>>>
>>
>> Please remove the trailing '\'. OK otherwise.
>>
>
> Changes in the v2 patch
>
> 1. Add a comment in malloc/tst-mallocalign1.c to indicate that it is
> used to verify that MALLOC_ALIGNMENT is honored by malloc.
> 2. Include <malloc-alignment.h> in malloc-size.h after SIZE_SZ is
> defined since <malloc-alignment.h> may use SIZE_SZ.
>
> BTW, I kept the trailing '\' since it is used in all other places in
> malloc/Makefile.
>
> OK for master?
I forgot to ask, does it run successfully on i686 and arm? IIRC it too
requires 16 byte alignment and hence both i686 and x32 will fail.
If they don't succeed then it may make sense to add
tests-exclude-mcheck += tst-mallocalign1
for x32 and i686.
Siddhesh
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v3] Add a generic malloc test for MALLOC_ALIGNMENT
2021-07-09 13:00 ` Siddhesh Poyarekar
@ 2021-07-09 13:31 ` H.J. Lu
2021-07-09 13:34 ` Siddhesh Poyarekar
0 siblings, 1 reply; 28+ messages in thread
From: H.J. Lu @ 2021-07-09 13:31 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: Stefan Liebler, GNU C Library
[-- Attachment #1: Type: text/plain, Size: 1516 bytes --]
On Fri, Jul 9, 2021 at 6:00 AM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>
> On 7/9/21 5:54 PM, H.J. Lu wrote:
> > On Thu, Jul 8, 2021 at 9:07 PM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
> >>
> >>> diff --git a/malloc/Makefile b/malloc/Makefile
> >>> index 37a9a4efab..b685ed6d61 100644
> >>> --- a/malloc/Makefile
> >>> +++ b/malloc/Makefile
> >>> @@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
> >>> tst-malloc-stats-cancellation \
> >>> tst-tcfree1 tst-tcfree2 tst-tcfree3 \
> >>> tst-safe-linking \
> >>> + tst-mallocalign1 \
> >>>
> >>
> >> Please remove the trailing '\'. OK otherwise.
> >>
> >
> > Changes in the v2 patch
> >
> > 1. Add a comment in malloc/tst-mallocalign1.c to indicate that it is
> > used to verify that MALLOC_ALIGNMENT is honored by malloc.
> > 2. Include <malloc-alignment.h> in malloc-size.h after SIZE_SZ is
> > defined since <malloc-alignment.h> may use SIZE_SZ.
> >
> > BTW, I kept the trailing '\' since it is used in all other places in
> > malloc/Makefile.
> >
> > OK for master?
>
> I forgot to ask, does it run successfully on i686 and arm? IIRC it too
> requires 16 byte alignment and hence both i686 and x32 will fail.
It fails on i686 and x32.
> If they don't succeed then it may make sense to add
>
> tests-exclude-mcheck += tst-mallocalign1
>
> for x32 and i686.
>
> Siddhesh
Here is the v3 patch to add tst-mallocalign1 to tests-exclude-mcheck
for i386 and x32.
OK for master?
--
H.J.
[-- Attachment #2: v3-0001-Add-a-generic-malloc-test-for-MALLOC_ALIGNMENT.patch --]
[-- Type: text/x-patch, Size: 10454 bytes --]
From 8343b90bf0180c011838259fa29aa5958337e656 Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Thu, 8 Jul 2021 20:48:14 -0700
Subject: [PATCH v3] Add a generic malloc test for MALLOC_ALIGNMENT
1. Add sysdeps/generic/malloc-size.h to define size related macros for
malloc.
2. Move x86_64/tst-mallocalign1.c to malloc and replace ALIGN_MASK with
MALLOC_ALIGN_MASK.
3. Add tst-mallocalign1 to tests-exclude-mcheck for i386 and x32 since
mcheck doesn't honor MALLOC_ALIGNMENT.
---
malloc/Makefile | 1 +
malloc/malloc-internal.h | 41 +-----------
{sysdeps/x86_64 => malloc}/tst-mallocalign1.c | 31 +++++----
sysdeps/generic/malloc-machine.h | 1 -
sysdeps/generic/malloc-size.h | 64 +++++++++++++++++++
sysdeps/i386/Makefile | 4 ++
sysdeps/x86_64/Makefile | 4 --
sysdeps/x86_64/x32/Makefile | 4 ++
8 files changed, 89 insertions(+), 61 deletions(-)
rename {sysdeps/x86_64 => malloc}/tst-mallocalign1.c (65%)
create mode 100644 sysdeps/generic/malloc-size.h
diff --git a/malloc/Makefile b/malloc/Makefile
index 37a9a4efab..b685ed6d61 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
tst-malloc-stats-cancellation \
tst-tcfree1 tst-tcfree2 tst-tcfree3 \
tst-safe-linking \
+ tst-mallocalign1 \
tests-static := \
tst-interpose-static-nothread \
diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h
index 258f29584e..0c7b5a183c 100644
--- a/malloc/malloc-internal.h
+++ b/malloc/malloc-internal.h
@@ -21,46 +21,7 @@
#include <malloc-machine.h>
#include <malloc-sysdep.h>
-
-/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
- chunk sizes.
-
- The default version is the same as size_t.
-
- While not strictly necessary, it is best to define this as an
- unsigned type, even if size_t is a signed type. This may avoid some
- artificial size limitations on some systems.
-
- On a 64-bit machine, you may be able to reduce malloc overhead by
- defining INTERNAL_SIZE_T to be a 32 bit `unsigned int' at the
- expense of not being able to handle more than 2^32 of malloced
- space. If this limitation is acceptable, you are encouraged to set
- this unless you are on a platform requiring 16byte alignments. In
- this case the alignment requirements turn out to negate any
- potential advantages of decreasing size_t word size.
-
- Implementors: Beware of the possible combinations of:
- - INTERNAL_SIZE_T might be signed or unsigned, might be 32 or 64 bits,
- and might be the same width as int or as long
- - size_t might have different width and signedness as INTERNAL_SIZE_T
- - int and long might be 32 or 64 bits, and might be the same width
-
- To deal with this, most comparisons and difference computations
- among INTERNAL_SIZE_Ts should cast them to unsigned long, being
- aware of the fact that casting an unsigned int to a wider long does
- not sign-extend. (This also makes checking for negative numbers
- awkward.) Some of these casts result in harmless compiler warnings
- on some systems. */
-#ifndef INTERNAL_SIZE_T
-# define INTERNAL_SIZE_T size_t
-#endif
-
-/* The corresponding word size. */
-#define SIZE_SZ (sizeof (INTERNAL_SIZE_T))
-
-/* The corresponding bit mask value. */
-#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
-
+#include <malloc-size.h>
/* Called in the parent process before a fork. */
void __malloc_fork_lock_parent (void) attribute_hidden;
diff --git a/sysdeps/x86_64/tst-mallocalign1.c b/malloc/tst-mallocalign1.c
similarity index 65%
rename from sysdeps/x86_64/tst-mallocalign1.c
rename to malloc/tst-mallocalign1.c
index 33a6375777..294e821afe 100644
--- a/sysdeps/x86_64/tst-mallocalign1.c
+++ b/malloc/tst-mallocalign1.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 2012-2021 Free Software Foundation, Inc.
+/* Verify that MALLOC_ALIGNMENT is honored by malloc.
+ Copyright (C) 2012-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -17,17 +18,16 @@
#include <stdio.h>
#include <stdlib.h>
+#include <inttypes.h>
+#include <malloc-size.h>
-/* Specified by x86-64 psABI. */
-#define ALIGN_MASK (16 - 1)
-
-void *
+static void *
test (size_t s)
{
void *p = malloc (s);
- printf ("malloc: %ld, %p: %ld\n", (unsigned long) s, p,
- ((unsigned long) p) & ALIGN_MASK);
+ printf ("malloc: %zu, %p: %zu\n", s, p,
+ ((uintptr_t) p) & MALLOC_ALIGN_MASK);
return p;
}
@@ -38,35 +38,34 @@ do_test (void)
int ret = 0;
p = test (2);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (8);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (13);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (16);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (23);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (43);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
p = test (123);
- ret |= (unsigned long) p & ALIGN_MASK;
+ ret |= (uintptr_t) p & MALLOC_ALIGN_MASK;
free (p);
return ret;
}
-#define TEST_FUNCTION do_test ()
-#include "../test-skeleton.c"
+#include <support/test-driver.c>
diff --git a/sysdeps/generic/malloc-machine.h b/sysdeps/generic/malloc-machine.h
index a71f2361f5..121d8ad0c9 100644
--- a/sysdeps/generic/malloc-machine.h
+++ b/sysdeps/generic/malloc-machine.h
@@ -21,7 +21,6 @@
#define _GENERIC_MALLOC_MACHINE_H
#include <atomic.h>
-#include <malloc-alignment.h>
#ifndef atomic_full_barrier
# define atomic_full_barrier() __asm ("" ::: "memory")
diff --git a/sysdeps/generic/malloc-size.h b/sysdeps/generic/malloc-size.h
new file mode 100644
index 0000000000..41901b9a44
--- /dev/null
+++ b/sysdeps/generic/malloc-size.h
@@ -0,0 +1,64 @@
+/* Define INTERNAL_SIZE_T, SIZE_SZ, MALLOC_ALIGNMENT and MALLOC_ALIGN_MASK
+ for malloc.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _GENERIC_MALLOC_SIZE_H
+#define _GENERIC_MALLOC_SIZE_H
+
+/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
+ chunk sizes.
+
+ The default version is the same as size_t.
+
+ While not strictly necessary, it is best to define this as an
+ unsigned type, even if size_t is a signed type. This may avoid some
+ artificial size limitations on some systems.
+
+ On a 64-bit machine, you may be able to reduce malloc overhead by
+ defining INTERNAL_SIZE_T to be a 32 bit `unsigned int' at the
+ expense of not being able to handle more than 2^32 of malloced
+ space. If this limitation is acceptable, you are encouraged to set
+ this unless you are on a platform requiring 16byte alignments. In
+ this case the alignment requirements turn out to negate any
+ potential advantages of decreasing size_t word size.
+
+ Implementors: Beware of the possible combinations of:
+ - INTERNAL_SIZE_T might be signed or unsigned, might be 32 or 64 bits,
+ and might be the same width as int or as long
+ - size_t might have different width and signedness as INTERNAL_SIZE_T
+ - int and long might be 32 or 64 bits, and might be the same width
+
+ To deal with this, most comparisons and difference computations
+ among INTERNAL_SIZE_Ts should cast them to unsigned long, being
+ aware of the fact that casting an unsigned int to a wider long does
+ not sign-extend. (This also makes checking for negative numbers
+ awkward.) Some of these casts result in harmless compiler warnings
+ on some systems. */
+#ifndef INTERNAL_SIZE_T
+# define INTERNAL_SIZE_T size_t
+#endif
+
+/* The corresponding word size. */
+#define SIZE_SZ (sizeof (INTERNAL_SIZE_T))
+
+#include <malloc-alignment.h>
+
+/* The corresponding bit mask value. */
+#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
+
+#endif /* _GENERIC_MALLOC_SIZE_H */
diff --git a/sysdeps/i386/Makefile b/sysdeps/i386/Makefile
index a2e8c0b128..8fb65c0f17 100644
--- a/sysdeps/i386/Makefile
+++ b/sysdeps/i386/Makefile
@@ -5,6 +5,10 @@ asm-CPPFLAGS += -DGAS_SYNTAX
# The i386 `long double' is a distinct type we support.
long-double-fcts = yes
+ifeq ($(subdir),malloc)
+tests-exclude-mcheck += tst-mallocalign1
+endif
+
ifeq ($(subdir),math)
# These functions change the rounding mode internally and need to
# update both the SSE2 rounding mode and the 387 rounding mode. See
diff --git a/sysdeps/x86_64/Makefile b/sysdeps/x86_64/Makefile
index 3fc03f4a19..22c5b63ab5 100644
--- a/sysdeps/x86_64/Makefile
+++ b/sysdeps/x86_64/Makefile
@@ -13,10 +13,6 @@ sysdep_routines += _mcount
sysdep_noprof += _mcount
endif
-ifeq ($(subdir),malloc)
-tests += tst-mallocalign1
-endif
-
ifeq ($(subdir),string)
sysdep_routines += strcasecmp_l-nonascii strncase_l-nonascii
gen-as-const-headers += locale-defines.sym
diff --git a/sysdeps/x86_64/x32/Makefile b/sysdeps/x86_64/x32/Makefile
index 8748956563..62919c79f1 100644
--- a/sysdeps/x86_64/x32/Makefile
+++ b/sysdeps/x86_64/x32/Makefile
@@ -1,3 +1,7 @@
+ifeq ($(subdir),malloc)
+tests-exclude-mcheck += tst-mallocalign1
+endif
+
ifeq ($(subdir),math)
# Since x32 returns 32-bit long int and 64-bit long long int in the
# same 64-bit register, we make the 32b-bit lround an alias of the
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3] Add a generic malloc test for MALLOC_ALIGNMENT
2021-07-09 13:31 ` [PATCH v3] " H.J. Lu
@ 2021-07-09 13:34 ` Siddhesh Poyarekar
0 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-09 13:34 UTC (permalink / raw)
To: H.J. Lu; +Cc: Stefan Liebler, GNU C Library
On 7/9/21 7:01 PM, H.J. Lu wrote:
> On Fri, Jul 9, 2021 at 6:00 AM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>>
>> On 7/9/21 5:54 PM, H.J. Lu wrote:
>>> On Thu, Jul 8, 2021 at 9:07 PM Siddhesh Poyarekar <siddhesh@gotplt.org> wrote:
>>>>
>>>>> diff --git a/malloc/Makefile b/malloc/Makefile
>>>>> index 37a9a4efab..b685ed6d61 100644
>>>>> --- a/malloc/Makefile
>>>>> +++ b/malloc/Makefile
>>>>> @@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
>>>>> tst-malloc-stats-cancellation \
>>>>> tst-tcfree1 tst-tcfree2 tst-tcfree3 \
>>>>> tst-safe-linking \
>>>>> + tst-mallocalign1 \
>>>>>
>>>>
>>>> Please remove the trailing '\'. OK otherwise.
>>>>
>>>
>>> Changes in the v2 patch
>>>
>>> 1. Add a comment in malloc/tst-mallocalign1.c to indicate that it is
>>> used to verify that MALLOC_ALIGNMENT is honored by malloc.
>>> 2. Include <malloc-alignment.h> in malloc-size.h after SIZE_SZ is
>>> defined since <malloc-alignment.h> may use SIZE_SZ.
>>>
>>> BTW, I kept the trailing '\' since it is used in all other places in
>>> malloc/Makefile.
>>>
>>> OK for master?
>>
>> I forgot to ask, does it run successfully on i686 and arm? IIRC it too
>> requires 16 byte alignment and hence both i686 and x32 will fail.
>
> It fails on i686 and x32.
>
>> If they don't succeed then it may make sense to add
>>
>> tests-exclude-mcheck += tst-mallocalign1
>>
>> for x32 and i686.
>>
>> Siddhesh
>
> Here is the v3 patch to add tst-mallocalign1 to tests-exclude-mcheck
> for i386 and x32.
>
> OK for master?
>
Looks good to me.
Thanks,
Siddhesh
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v3 02/10] Add mcheck tests to malloc
2021-07-09 1:46 ` Siddhesh Poyarekar
2021-07-09 3:53 ` [PATCH] Add a generic malloc test for MALLOC_ALIGNMENT H.J. Lu
@ 2021-07-12 18:02 ` Matheus Castanho
2021-07-13 1:06 ` Siddhesh Poyarekar
1 sibling, 1 reply; 28+ messages in thread
From: Matheus Castanho @ 2021-07-12 18:02 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: H.J. Lu, Stefan Liebler, libc-alpha
Siddhesh Poyarekar <siddhesh@gotplt.org> writes:
> On 7/9/21 5:36 AM, H.J. Lu wrote:
>>> It also caused:
>>>
>>> https://sourceware.org/bugzilla/show_bug.cgi?id=28068
>>>
>>> on x32.
>> mcheck.c doesn't take MALLOC_ALIGNMENT into account. Will it be removed
>> or fixed?
>
> Very interesting, I think it's best to exclude the test for mcheck on x32 for
> now. I'll fix mcheck once the malloc hooks patchset[1] is in.
>
I just noticed this test is also failing on powerpc32. Similar to
x32. Does it make sense to exclude it there too?
--
Matheus Castanho
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v3 03/10] Move glibc.malloc.check implementation into its own file
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 01/10] mtrace: Deprecate mallwatch and tr_break Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 02/10] Add mcheck tests to malloc Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 9:05 ` Andreas Schwab
2021-07-02 2:35 ` [PATCH v3 04/10] malloc: Move malloc hook references to hooks.c Siddhesh Poyarekar
` (6 subsequent siblings)
9 siblings, 1 reply; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Separate the malloc check implementation from the malloc hooks. They
still use the hooks but are now maintained in a separate file.
---
malloc/Makefile | 3 +-
malloc/hooks.c | 371 +---------------------------------------
malloc/malloc-check.c | 390 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 393 insertions(+), 371 deletions(-)
create mode 100644 malloc/malloc-check.c
diff --git a/malloc/Makefile b/malloc/Makefile
index c8256abbbf..47013d44aa 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -271,7 +271,8 @@ $(objpfx)memusage: memusage.sh
# Extra dependencies
-$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c
+$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c \
+ malloc-check.c
# Compile the tests with a flag which suppresses the mallopt call in
# the test skeleton.
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 8080c3f40e..57a9b55788 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -49,376 +49,7 @@ memalign_hook_ini (size_t alignment, size_t sz, const void *caller)
return __libc_memalign (alignment, sz);
}
-/* Whether we are using malloc checking. */
-static int using_malloc_checking;
-
-/* Activate a standard set of debugging hooks. */
-void
-__malloc_check_init (void)
-{
- using_malloc_checking = 1;
- __malloc_hook = malloc_check;
- __free_hook = free_check;
- __realloc_hook = realloc_check;
- __memalign_hook = memalign_check;
-}
-
-/* When memory is tagged, the checking data is stored in the user part
- of the chunk. We can't rely on the user not having modified the
- tags, so fetch the tag at each location before dereferencing
- it. */
-#define SAFE_CHAR_OFFSET(p,offset) \
- ((unsigned char *) tag_at (((unsigned char *) p) + offset))
-
-/* A simple, standard set of debugging hooks. Overhead is `only' one
- byte per chunk; still this will catch most cases of double frees or
- overruns. The goal here is to avoid obscure crashes due to invalid
- usage, unlike in the MALLOC_DEBUG code. */
-
-static unsigned char
-magicbyte (const void *p)
-{
- unsigned char magic;
-
- magic = (((uintptr_t) p >> 3) ^ ((uintptr_t) p >> 11)) & 0xFF;
- /* Do not return 1. See the comment in mem2mem_check(). */
- if (magic == 1)
- ++magic;
- return magic;
-}
-
-/* Visualize the chunk as being partitioned into blocks of 255 bytes from the
- highest address of the chunk, downwards. The end of each block tells
- us the size of that block, up to the actual size of the requested
- memory. Our magic byte is right at the end of the requested size, so we
- must reach it with this iteration, otherwise we have witnessed a memory
- corruption. */
-static size_t
-malloc_check_get_size (mchunkptr p)
-{
- size_t size;
- unsigned char c;
- unsigned char magic = magicbyte (p);
-
- assert (using_malloc_checking == 1);
-
- for (size = CHUNK_HDR_SZ + memsize (p) - 1;
- (c = *SAFE_CHAR_OFFSET (p, size)) != magic;
- size -= c)
- {
- if (c <= 0 || size < (c + CHUNK_HDR_SZ))
- malloc_printerr ("malloc_check_get_size: memory corruption");
- }
-
- /* chunk2mem size. */
- return size - CHUNK_HDR_SZ;
-}
-
-/* Instrument a chunk with overrun detector byte(s) and convert it
- into a user pointer with requested size req_sz. */
-
-static void *
-mem2mem_check (void *ptr, size_t req_sz)
-{
- mchunkptr p;
- unsigned char *m_ptr = ptr;
- size_t max_sz, block_sz, i;
- unsigned char magic;
-
- if (!ptr)
- return ptr;
-
- p = mem2chunk (ptr);
- magic = magicbyte (p);
- max_sz = memsize (p);
-
- for (i = max_sz - 1; i > req_sz; i -= block_sz)
- {
- block_sz = MIN (i - req_sz, 0xff);
- /* Don't allow the magic byte to appear in the chain of length bytes.
- For the following to work, magicbyte cannot return 0x01. */
- if (block_sz == magic)
- --block_sz;
-
- *SAFE_CHAR_OFFSET (m_ptr, i) = block_sz;
- }
- *SAFE_CHAR_OFFSET (m_ptr, req_sz) = magic;
- return (void *) m_ptr;
-}
-
-/* Convert a pointer to be free()d or realloc()ed to a valid chunk
- pointer. If the provided pointer is not valid, return NULL. */
-
-static mchunkptr
-mem2chunk_check (void *mem, unsigned char **magic_p)
-{
- mchunkptr p;
- INTERNAL_SIZE_T sz, c;
- unsigned char magic;
-
- if (!aligned_OK (mem))
- return NULL;
-
- p = mem2chunk (mem);
- sz = chunksize (p);
- magic = magicbyte (p);
- if (!chunk_is_mmapped (p))
- {
- /* Must be a chunk in conventional heap memory. */
- int contig = contiguous (&main_arena);
- if ((contig &&
- ((char *) p < mp_.sbrk_base ||
- ((char *) p + sz) >= (mp_.sbrk_base + main_arena.system_mem))) ||
- sz < MINSIZE || sz & MALLOC_ALIGN_MASK || !inuse (p) ||
- (!prev_inuse (p) && ((prev_size (p) & MALLOC_ALIGN_MASK) != 0 ||
- (contig && (char *) prev_chunk (p) < mp_.sbrk_base) ||
- next_chunk (prev_chunk (p)) != p)))
- return NULL;
-
- for (sz = CHUNK_HDR_SZ + memsize (p) - 1;
- (c = *SAFE_CHAR_OFFSET (p, sz)) != magic;
- sz -= c)
- {
- if (c == 0 || sz < (c + CHUNK_HDR_SZ))
- return NULL;
- }
- }
- else
- {
- unsigned long offset, page_mask = GLRO (dl_pagesize) - 1;
-
- /* mmap()ed chunks have MALLOC_ALIGNMENT or higher power-of-two
- alignment relative to the beginning of a page. Check this
- first. */
- offset = (unsigned long) mem & page_mask;
- if ((offset != MALLOC_ALIGNMENT && offset != 0 && offset != 0x10 &&
- offset != 0x20 && offset != 0x40 && offset != 0x80 && offset != 0x100 &&
- offset != 0x200 && offset != 0x400 && offset != 0x800 && offset != 0x1000 &&
- offset < 0x2000) ||
- !chunk_is_mmapped (p) || prev_inuse (p) ||
- ((((unsigned long) p - prev_size (p)) & page_mask) != 0) ||
- ((prev_size (p) + sz) & page_mask) != 0)
- return NULL;
-
- for (sz = CHUNK_HDR_SZ + memsize (p) - 1;
- (c = *SAFE_CHAR_OFFSET (p, sz)) != magic;
- sz -= c)
- {
- if (c == 0 || sz < (c + CHUNK_HDR_SZ))
- return NULL;
- }
- }
-
- unsigned char* safe_p = SAFE_CHAR_OFFSET (p, sz);
- *safe_p ^= 0xFF;
- if (magic_p)
- *magic_p = safe_p;
- return p;
-}
-
-/* Check for corruption of the top chunk. */
-static void
-top_check (void)
-{
- mchunkptr t = top (&main_arena);
-
- if (t == initial_top (&main_arena) ||
- (!chunk_is_mmapped (t) &&
- chunksize (t) >= MINSIZE &&
- prev_inuse (t) &&
- (!contiguous (&main_arena) ||
- (char *) t + chunksize (t) == mp_.sbrk_base + main_arena.system_mem)))
- return;
-
- malloc_printerr ("malloc: top chunk is corrupt");
-}
-
-static void *
-malloc_check (size_t sz, const void *caller)
-{
- void *victim;
- size_t nb;
-
- if (__builtin_add_overflow (sz, 1, &nb))
- {
- __set_errno (ENOMEM);
- return NULL;
- }
-
- __libc_lock_lock (main_arena.mutex);
- top_check ();
- victim = _int_malloc (&main_arena, nb);
- __libc_lock_unlock (main_arena.mutex);
- return mem2mem_check (tag_new_usable (victim), sz);
-}
-
-static void
-free_check (void *mem, const void *caller)
-{
- mchunkptr p;
-
- if (!mem)
- return;
-
- int err = errno;
-
- /* Quickly check that the freed pointer matches the tag for the memory.
- This gives a useful double-free detection. */
- if (__glibc_unlikely (mtag_enabled))
- *(volatile char *)mem;
-
- __libc_lock_lock (main_arena.mutex);
- p = mem2chunk_check (mem, NULL);
- if (!p)
- malloc_printerr ("free(): invalid pointer");
- if (chunk_is_mmapped (p))
- {
- __libc_lock_unlock (main_arena.mutex);
- munmap_chunk (p);
- }
- else
- {
- /* Mark the chunk as belonging to the library again. */
- (void)tag_region (chunk2mem (p), memsize (p));
- _int_free (&main_arena, p, 1);
- __libc_lock_unlock (main_arena.mutex);
- }
- __set_errno (err);
-}
-
-static void *
-realloc_check (void *oldmem, size_t bytes, const void *caller)
-{
- INTERNAL_SIZE_T chnb;
- void *newmem = 0;
- unsigned char *magic_p;
- size_t rb;
-
- if (__builtin_add_overflow (bytes, 1, &rb))
- {
- __set_errno (ENOMEM);
- return NULL;
- }
- if (oldmem == 0)
- return malloc_check (bytes, NULL);
-
- if (bytes == 0)
- {
- free_check (oldmem, NULL);
- return NULL;
- }
-
- /* Quickly check that the freed pointer matches the tag for the memory.
- This gives a useful double-free detection. */
- if (__glibc_unlikely (mtag_enabled))
- *(volatile char *)oldmem;
-
- __libc_lock_lock (main_arena.mutex);
- const mchunkptr oldp = mem2chunk_check (oldmem, &magic_p);
- __libc_lock_unlock (main_arena.mutex);
- if (!oldp)
- malloc_printerr ("realloc(): invalid pointer");
- const INTERNAL_SIZE_T oldsize = chunksize (oldp);
-
- if (!checked_request2size (rb, &chnb))
- {
- __set_errno (ENOMEM);
- goto invert;
- }
-
- __libc_lock_lock (main_arena.mutex);
-
- if (chunk_is_mmapped (oldp))
- {
-#if HAVE_MREMAP
- mchunkptr newp = mremap_chunk (oldp, chnb);
- if (newp)
- newmem = chunk2mem_tag (newp);
- else
-#endif
- {
- /* Note the extra SIZE_SZ overhead. */
- if (oldsize - SIZE_SZ >= chnb)
- newmem = oldmem; /* do nothing */
- else
- {
- /* Must alloc, copy, free. */
- top_check ();
- newmem = _int_malloc (&main_arena, rb);
- if (newmem)
- {
- memcpy (newmem, oldmem, oldsize - CHUNK_HDR_SZ);
- munmap_chunk (oldp);
- }
- }
- }
- }
- else
- {
- top_check ();
- newmem = _int_realloc (&main_arena, oldp, oldsize, chnb);
- }
-
- DIAG_PUSH_NEEDS_COMMENT;
-#if __GNUC_PREREQ (7, 0)
- /* GCC 7 warns about magic_p may be used uninitialized. But we never
- reach here if magic_p is uninitialized. */
- DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized");
-#endif
- /* mem2chunk_check changed the magic byte in the old chunk.
- If newmem is NULL, then the old chunk will still be used though,
- so we need to invert that change here. */
-invert:
- if (newmem == NULL)
- *magic_p ^= 0xFF;
- DIAG_POP_NEEDS_COMMENT;
-
- __libc_lock_unlock (main_arena.mutex);
-
- return mem2mem_check (tag_new_usable (newmem), bytes);
-}
-
-static void *
-memalign_check (size_t alignment, size_t bytes, const void *caller)
-{
- void *mem;
-
- if (alignment <= MALLOC_ALIGNMENT)
- return malloc_check (bytes, NULL);
-
- if (alignment < MINSIZE)
- alignment = MINSIZE;
-
- /* If the alignment is greater than SIZE_MAX / 2 + 1 it cannot be a
- power of 2 and will cause overflow in the check below. */
- if (alignment > SIZE_MAX / 2 + 1)
- {
- __set_errno (EINVAL);
- return 0;
- }
-
- /* Check for overflow. */
- if (bytes > SIZE_MAX - alignment - MINSIZE)
- {
- __set_errno (ENOMEM);
- return 0;
- }
-
- /* Make sure alignment is power of 2. */
- if (!powerof2 (alignment))
- {
- size_t a = MALLOC_ALIGNMENT * 2;
- while (a < alignment)
- a <<= 1;
- alignment = a;
- }
-
- __libc_lock_lock (main_arena.mutex);
- top_check ();
- mem = _int_memalign (&main_arena, alignment, bytes + 1);
- __libc_lock_unlock (main_arena.mutex);
- return mem2mem_check (tag_new_usable (mem), bytes);
-}
+#include "malloc-check.c"
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25)
diff --git a/malloc/malloc-check.c b/malloc/malloc-check.c
new file mode 100644
index 0000000000..dcab880510
--- /dev/null
+++ b/malloc/malloc-check.c
@@ -0,0 +1,390 @@
+/* glibc.malloc.check implementation.
+ Copyright (C) 2001-2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Wolfram Gloger <wg@malloc.de>, 2001.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If
+ not, see <https://www.gnu.org/licenses/>. */
+
+
+/* Whether we are using malloc checking. */
+static int using_malloc_checking;
+
+/* Activate a standard set of debugging hooks. */
+void
+__malloc_check_init (void)
+{
+ using_malloc_checking = 1;
+ __malloc_hook = malloc_check;
+ __free_hook = free_check;
+ __realloc_hook = realloc_check;
+ __memalign_hook = memalign_check;
+}
+
+/* When memory is tagged, the checking data is stored in the user part
+ of the chunk. We can't rely on the user not having modified the
+ tags, so fetch the tag at each location before dereferencing
+ it. */
+#define SAFE_CHAR_OFFSET(p,offset) \
+ ((unsigned char *) tag_at (((unsigned char *) p) + offset))
+
+/* A simple, standard set of debugging hooks. Overhead is `only' one
+ byte per chunk; still this will catch most cases of double frees or
+ overruns. The goal here is to avoid obscure crashes due to invalid
+ usage, unlike in the MALLOC_DEBUG code. */
+
+static unsigned char
+magicbyte (const void *p)
+{
+ unsigned char magic;
+
+ magic = (((uintptr_t) p >> 3) ^ ((uintptr_t) p >> 11)) & 0xFF;
+ /* Do not return 1. See the comment in mem2mem_check(). */
+ if (magic == 1)
+ ++magic;
+ return magic;
+}
+
+/* Visualize the chunk as being partitioned into blocks of 255 bytes from the
+ highest address of the chunk, downwards. The end of each block tells
+ us the size of that block, up to the actual size of the requested
+ memory. Our magic byte is right at the end of the requested size, so we
+ must reach it with this iteration, otherwise we have witnessed a memory
+ corruption. */
+static size_t
+malloc_check_get_size (mchunkptr p)
+{
+ size_t size;
+ unsigned char c;
+ unsigned char magic = magicbyte (p);
+
+ assert (using_malloc_checking == 1);
+
+ for (size = CHUNK_HDR_SZ + memsize (p) - 1;
+ (c = *SAFE_CHAR_OFFSET (p, size)) != magic;
+ size -= c)
+ {
+ if (c <= 0 || size < (c + CHUNK_HDR_SZ))
+ malloc_printerr ("malloc_check_get_size: memory corruption");
+ }
+
+ /* chunk2mem size. */
+ return size - CHUNK_HDR_SZ;
+}
+
+/* Instrument a chunk with overrun detector byte(s) and convert it
+ into a user pointer with requested size req_sz. */
+
+static void *
+mem2mem_check (void *ptr, size_t req_sz)
+{
+ mchunkptr p;
+ unsigned char *m_ptr = ptr;
+ size_t max_sz, block_sz, i;
+ unsigned char magic;
+
+ if (!ptr)
+ return ptr;
+
+ p = mem2chunk (ptr);
+ magic = magicbyte (p);
+ max_sz = memsize (p);
+
+ for (i = max_sz - 1; i > req_sz; i -= block_sz)
+ {
+ block_sz = MIN (i - req_sz, 0xff);
+ /* Don't allow the magic byte to appear in the chain of length bytes.
+ For the following to work, magicbyte cannot return 0x01. */
+ if (block_sz == magic)
+ --block_sz;
+
+ *SAFE_CHAR_OFFSET (m_ptr, i) = block_sz;
+ }
+ *SAFE_CHAR_OFFSET (m_ptr, req_sz) = magic;
+ return (void *) m_ptr;
+}
+
+/* Convert a pointer to be free()d or realloc()ed to a valid chunk
+ pointer. If the provided pointer is not valid, return NULL. */
+
+static mchunkptr
+mem2chunk_check (void *mem, unsigned char **magic_p)
+{
+ mchunkptr p;
+ INTERNAL_SIZE_T sz, c;
+ unsigned char magic;
+
+ if (!aligned_OK (mem))
+ return NULL;
+
+ p = mem2chunk (mem);
+ sz = chunksize (p);
+ magic = magicbyte (p);
+ if (!chunk_is_mmapped (p))
+ {
+ /* Must be a chunk in conventional heap memory. */
+ int contig = contiguous (&main_arena);
+ if ((contig &&
+ ((char *) p < mp_.sbrk_base ||
+ ((char *) p + sz) >= (mp_.sbrk_base + main_arena.system_mem))) ||
+ sz < MINSIZE || sz & MALLOC_ALIGN_MASK || !inuse (p) ||
+ (!prev_inuse (p) && ((prev_size (p) & MALLOC_ALIGN_MASK) != 0 ||
+ (contig && (char *) prev_chunk (p) < mp_.sbrk_base) ||
+ next_chunk (prev_chunk (p)) != p)))
+ return NULL;
+
+ for (sz = CHUNK_HDR_SZ + memsize (p) - 1;
+ (c = *SAFE_CHAR_OFFSET (p, sz)) != magic;
+ sz -= c)
+ {
+ if (c == 0 || sz < (c + CHUNK_HDR_SZ))
+ return NULL;
+ }
+ }
+ else
+ {
+ unsigned long offset, page_mask = GLRO (dl_pagesize) - 1;
+
+ /* mmap()ed chunks have MALLOC_ALIGNMENT or higher power-of-two
+ alignment relative to the beginning of a page. Check this
+ first. */
+ offset = (unsigned long) mem & page_mask;
+ if ((offset != MALLOC_ALIGNMENT && offset != 0 && offset != 0x10 &&
+ offset != 0x20 && offset != 0x40 && offset != 0x80 && offset != 0x100 &&
+ offset != 0x200 && offset != 0x400 && offset != 0x800 && offset != 0x1000 &&
+ offset < 0x2000) ||
+ !chunk_is_mmapped (p) || prev_inuse (p) ||
+ ((((unsigned long) p - prev_size (p)) & page_mask) != 0) ||
+ ((prev_size (p) + sz) & page_mask) != 0)
+ return NULL;
+
+ for (sz = CHUNK_HDR_SZ + memsize (p) - 1;
+ (c = *SAFE_CHAR_OFFSET (p, sz)) != magic;
+ sz -= c)
+ {
+ if (c == 0 || sz < (c + CHUNK_HDR_SZ))
+ return NULL;
+ }
+ }
+
+ unsigned char* safe_p = SAFE_CHAR_OFFSET (p, sz);
+ *safe_p ^= 0xFF;
+ if (magic_p)
+ *magic_p = safe_p;
+ return p;
+}
+
+/* Check for corruption of the top chunk. */
+static void
+top_check (void)
+{
+ mchunkptr t = top (&main_arena);
+
+ if (t == initial_top (&main_arena) ||
+ (!chunk_is_mmapped (t) &&
+ chunksize (t) >= MINSIZE &&
+ prev_inuse (t) &&
+ (!contiguous (&main_arena) ||
+ (char *) t + chunksize (t) == mp_.sbrk_base + main_arena.system_mem)))
+ return;
+
+ malloc_printerr ("malloc: top chunk is corrupt");
+}
+
+static void *
+malloc_check (size_t sz, const void *caller)
+{
+ void *victim;
+ size_t nb;
+
+ if (__builtin_add_overflow (sz, 1, &nb))
+ {
+ __set_errno (ENOMEM);
+ return NULL;
+ }
+
+ __libc_lock_lock (main_arena.mutex);
+ top_check ();
+ victim = _int_malloc (&main_arena, nb);
+ __libc_lock_unlock (main_arena.mutex);
+ return mem2mem_check (tag_new_usable (victim), sz);
+}
+
+static void
+free_check (void *mem, const void *caller)
+{
+ mchunkptr p;
+
+ if (!mem)
+ return;
+
+ int err = errno;
+
+ /* Quickly check that the freed pointer matches the tag for the memory.
+ This gives a useful double-free detection. */
+ if (__glibc_unlikely (mtag_enabled))
+ *(volatile char *)mem;
+
+ __libc_lock_lock (main_arena.mutex);
+ p = mem2chunk_check (mem, NULL);
+ if (!p)
+ malloc_printerr ("free(): invalid pointer");
+ if (chunk_is_mmapped (p))
+ {
+ __libc_lock_unlock (main_arena.mutex);
+ munmap_chunk (p);
+ }
+ else
+ {
+ /* Mark the chunk as belonging to the library again. */
+ (void)tag_region (chunk2mem (p), memsize (p));
+ _int_free (&main_arena, p, 1);
+ __libc_lock_unlock (main_arena.mutex);
+ }
+ __set_errno (err);
+}
+
+static void *
+realloc_check (void *oldmem, size_t bytes, const void *caller)
+{
+ INTERNAL_SIZE_T chnb;
+ void *newmem = 0;
+ unsigned char *magic_p;
+ size_t rb;
+
+ if (__builtin_add_overflow (bytes, 1, &rb))
+ {
+ __set_errno (ENOMEM);
+ return NULL;
+ }
+ if (oldmem == 0)
+ return malloc_check (bytes, NULL);
+
+ if (bytes == 0)
+ {
+ free_check (oldmem, NULL);
+ return NULL;
+ }
+
+ /* Quickly check that the freed pointer matches the tag for the memory.
+ This gives a useful double-free detection. */
+ if (__glibc_unlikely (mtag_enabled))
+ *(volatile char *)oldmem;
+
+ __libc_lock_lock (main_arena.mutex);
+ const mchunkptr oldp = mem2chunk_check (oldmem, &magic_p);
+ __libc_lock_unlock (main_arena.mutex);
+ if (!oldp)
+ malloc_printerr ("realloc(): invalid pointer");
+ const INTERNAL_SIZE_T oldsize = chunksize (oldp);
+
+ if (!checked_request2size (rb, &chnb))
+ {
+ __set_errno (ENOMEM);
+ goto invert;
+ }
+
+ __libc_lock_lock (main_arena.mutex);
+
+ if (chunk_is_mmapped (oldp))
+ {
+#if HAVE_MREMAP
+ mchunkptr newp = mremap_chunk (oldp, chnb);
+ if (newp)
+ newmem = chunk2mem_tag (newp);
+ else
+#endif
+ {
+ /* Note the extra SIZE_SZ overhead. */
+ if (oldsize - SIZE_SZ >= chnb)
+ newmem = oldmem; /* do nothing */
+ else
+ {
+ /* Must alloc, copy, free. */
+ top_check ();
+ newmem = _int_malloc (&main_arena, rb);
+ if (newmem)
+ {
+ memcpy (newmem, oldmem, oldsize - CHUNK_HDR_SZ);
+ munmap_chunk (oldp);
+ }
+ }
+ }
+ }
+ else
+ {
+ top_check ();
+ newmem = _int_realloc (&main_arena, oldp, oldsize, chnb);
+ }
+
+ DIAG_PUSH_NEEDS_COMMENT;
+#if __GNUC_PREREQ (7, 0)
+ /* GCC 7 warns about magic_p may be used uninitialized. But we never
+ reach here if magic_p is uninitialized. */
+ DIAG_IGNORE_NEEDS_COMMENT (7, "-Wmaybe-uninitialized");
+#endif
+ /* mem2chunk_check changed the magic byte in the old chunk.
+ If newmem is NULL, then the old chunk will still be used though,
+ so we need to invert that change here. */
+invert:
+ if (newmem == NULL)
+ *magic_p ^= 0xFF;
+ DIAG_POP_NEEDS_COMMENT;
+
+ __libc_lock_unlock (main_arena.mutex);
+
+ return mem2mem_check (tag_new_usable (newmem), bytes);
+}
+
+static void *
+memalign_check (size_t alignment, size_t bytes, const void *caller)
+{
+ void *mem;
+
+ if (alignment <= MALLOC_ALIGNMENT)
+ return malloc_check (bytes, NULL);
+
+ if (alignment < MINSIZE)
+ alignment = MINSIZE;
+
+ /* If the alignment is greater than SIZE_MAX / 2 + 1 it cannot be a
+ power of 2 and will cause overflow in the check below. */
+ if (alignment > SIZE_MAX / 2 + 1)
+ {
+ __set_errno (EINVAL);
+ return 0;
+ }
+
+ /* Check for overflow. */
+ if (bytes > SIZE_MAX - alignment - MINSIZE)
+ {
+ __set_errno (ENOMEM);
+ return 0;
+ }
+
+ /* Make sure alignment is power of 2. */
+ if (!powerof2 (alignment))
+ {
+ size_t a = MALLOC_ALIGNMENT * 2;
+ while (a < alignment)
+ a <<= 1;
+ alignment = a;
+ }
+
+ __libc_lock_lock (main_arena.mutex);
+ top_check ();
+ mem = _int_memalign (&main_arena, alignment, bytes + 1);
+ __libc_lock_unlock (main_arena.mutex);
+ return mem2mem_check (tag_new_usable (mem), bytes);
+}
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3 03/10] Move glibc.malloc.check implementation into its own file
2021-07-02 2:35 ` [PATCH v3 03/10] Move glibc.malloc.check implementation into its own file Siddhesh Poyarekar
@ 2021-07-02 9:05 ` Andreas Schwab
2021-07-02 9:29 ` Siddhesh Poyarekar
0 siblings, 1 reply; 28+ messages in thread
From: Andreas Schwab @ 2021-07-02 9:05 UTC (permalink / raw)
To: Siddhesh Poyarekar via Libc-alpha; +Cc: Siddhesh Poyarekar, fweimer
On Jul 02 2021, Siddhesh Poyarekar via Libc-alpha wrote:
> diff --git a/malloc/Makefile b/malloc/Makefile
> index c8256abbbf..47013d44aa 100644
> --- a/malloc/Makefile
> +++ b/malloc/Makefile
> @@ -271,7 +271,8 @@ $(objpfx)memusage: memusage.sh
>
>
> # Extra dependencies
> -$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c
> +$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c \
> + malloc-check.c
I don't see any need for these manual dependencies.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v3 03/10] Move glibc.malloc.check implementation into its own file
2021-07-02 9:05 ` Andreas Schwab
@ 2021-07-02 9:29 ` Siddhesh Poyarekar
2021-07-02 9:59 ` Andreas Schwab
0 siblings, 1 reply; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 9:29 UTC (permalink / raw)
To: Andreas Schwab, Siddhesh Poyarekar via Libc-alpha; +Cc: fweimer
On 7/2/21 2:35 PM, Andreas Schwab wrote:
> On Jul 02 2021, Siddhesh Poyarekar via Libc-alpha wrote:
>
>> diff --git a/malloc/Makefile b/malloc/Makefile
>> index c8256abbbf..47013d44aa 100644
>> --- a/malloc/Makefile
>> +++ b/malloc/Makefile
>> @@ -271,7 +271,8 @@ $(objpfx)memusage: memusage.sh
>>
>>
>> # Extra dependencies
>> -$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c
>> +$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c \
>> + malloc-check.c
>
> I don't see any need for these manual dependencies.
May I just drop all the dependencies altogether in a separate patch
then? I see that arena.c and hooks.c dependencies also get
autogenerated in malloc.o{,s}.d.
Siddhesh
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v3 03/10] Move glibc.malloc.check implementation into its own file
2021-07-02 9:29 ` Siddhesh Poyarekar
@ 2021-07-02 9:59 ` Andreas Schwab
0 siblings, 0 replies; 28+ messages in thread
From: Andreas Schwab @ 2021-07-02 9:59 UTC (permalink / raw)
To: Siddhesh Poyarekar; +Cc: Siddhesh Poyarekar via Libc-alpha, fweimer
On Jul 02 2021, Siddhesh Poyarekar wrote:
> May I just drop all the dependencies altogether in a separate patch then?
Sure.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v3 04/10] malloc: Move malloc hook references to hooks.c
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
` (2 preceding siblings ...)
2021-07-02 2:35 ` [PATCH v3 03/10] Move glibc.malloc.check implementation into its own file Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 05/10] glibc.malloc.check: Wean away from malloc hooks Siddhesh Poyarekar
` (5 subsequent siblings)
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Make the core malloc code hooks free and instead only have entry
points for _*_debug_before inline functions.
This also introduces the first (albeit very constrained) breakage for
malloc hooks behaviour. The hook variables no longer call
ptmalloc_init, it is called directly on first invocation of an
allocator function. This breaks debugging hooks that may depend on
overriding the hook symbols with their own implementations due to
which ptmalloc_init is never called. In other words, it breaks hooks
users that use the malloc hooks to have their own implementation of
malloc that is conflicting with glibc malloc, which is not the
intended use of the hooks as documented.
None of the three debugging hooks in glibc depend on this behaviour
and hence continue to work as before. In any case, future patches
that move the hooks out into their own layer ought to bring back this
functionality. As a result, the breakage will not be visible to the
user in the end.
Reviewed-by: DJ Delorie <dj@redhat.com>
---
malloc/arena.c | 2 -
malloc/hooks.c | 110 ++++++++++++++++++++++++++++++++-------
malloc/malloc-internal.h | 1 +
malloc/malloc.c | 85 ++++++++++--------------------
4 files changed, 119 insertions(+), 79 deletions(-)
diff --git a/malloc/arena.c b/malloc/arena.c
index 7eb110445e..1861d20006 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -44,8 +44,6 @@
/***************************************************************************/
-#define top(ar_ptr) ((ar_ptr)->top)
-
/* A heap is a single contiguous memory region holding (coalesceable)
malloc_chunks. It is allocated with mmap() and always starts at an
address aligned to HEAP_MAX_SIZE. */
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 57a9b55788..4960aafd08 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -21,35 +21,107 @@
corrupt pointer is detected: do nothing (0), print an error message
(1), or call abort() (2). */
-/* Hooks for debugging versions. The initial hooks just call the
- initialization routine, then do the normal work. */
+/* Define and initialize the hook variables. These weak definitions must
+ appear before any use of the variables in a function (arena.c uses one). */
+#ifndef weak_variable
+/* In GNU libc we want the hook variables to be weak definitions to
+ avoid a problem with Emacs. */
+# define weak_variable weak_function
+#endif
+
+/* Forward declarations. */
+
+#if HAVE_MALLOC_INIT_HOOK
+void (*__malloc_initialize_hook) (void) __attribute__ ((nocommon));
+compat_symbol (libc, __malloc_initialize_hook,
+ __malloc_initialize_hook, GLIBC_2_0);
+#endif
+
+void weak_variable (*__free_hook) (void *__ptr,
+ const void *) = NULL;
+void *weak_variable (*__malloc_hook)
+ (size_t __size, const void *) = NULL;
+void *weak_variable (*__realloc_hook)
+ (void *__ptr, size_t __size, const void *) = NULL;
+void *weak_variable (*__memalign_hook)
+ (size_t __alignment, size_t __size, const void *) = NULL;
+
+static void ptmalloc_init (void);
-static void *
-malloc_hook_ini (size_t sz, const void *caller)
+#include "malloc-check.c"
+
+static __always_inline bool
+_malloc_debug_before (size_t bytes, void **victimp, const void *address)
{
- __malloc_hook = NULL;
- ptmalloc_init ();
- return __libc_malloc (sz);
+ _Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2,
+ "PTRDIFF_MAX is not more than half of SIZE_MAX");
+
+ void *(*hook) (size_t, const void *)
+ = atomic_forced_read (__malloc_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ *victimp = (*hook)(bytes, address);
+ return true;
+ }
+ return false;
}
-static void *
-realloc_hook_ini (void *ptr, size_t sz, const void *caller)
+static __always_inline bool
+_free_debug_before (void *mem, const void *address)
{
- __malloc_hook = NULL;
- __realloc_hook = NULL;
- ptmalloc_init ();
- return __libc_realloc (ptr, sz);
+ void (*hook) (void *, const void *)
+ = atomic_forced_read (__free_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ (*hook)(mem, address);
+ return true;
+ }
+ return false;
}
-static void *
-memalign_hook_ini (size_t alignment, size_t sz, const void *caller)
+static __always_inline bool
+_realloc_debug_before (void *oldmem, size_t bytes, void **victimp,
+ const void *address)
{
- __memalign_hook = NULL;
- ptmalloc_init ();
- return __libc_memalign (alignment, sz);
+ void *(*hook) (void *, size_t, const void *) =
+ atomic_forced_read (__realloc_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ *victimp = (*hook)(oldmem, bytes, address);
+ return true;
+ }
+
+ return false;
}
-#include "malloc-check.c"
+static __always_inline bool
+_memalign_debug_before (size_t alignment, size_t bytes, void **victimp,
+ const void *address)
+{
+ void *(*hook) (size_t, size_t, const void *) =
+ atomic_forced_read (__memalign_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ *victimp = (*hook)(alignment, bytes, address);
+ return true;
+ }
+ return false;
+}
+
+static __always_inline bool
+_calloc_debug_before (size_t bytes, void **victimp, const void *address)
+{
+ void *(*hook) (size_t, const void *) =
+ atomic_forced_read (__malloc_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ *victimp = (*hook)(bytes, address);
+ if (*victimp != NULL)
+ memset (*victimp, 0, bytes);
+ return true;
+ }
+ return false;
+}
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25)
diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h
index 258f29584e..ee0f5697af 100644
--- a/malloc/malloc-internal.h
+++ b/malloc/malloc-internal.h
@@ -61,6 +61,7 @@
/* The corresponding bit mask value. */
#define MALLOC_ALIGN_MASK (MALLOC_ALIGNMENT - 1)
+#define top(ar_ptr) ((ar_ptr)->top)
/* Called in the parent process before a fork. */
void __malloc_fork_lock_parent (void) attribute_hidden;
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 0e2e1747e0..75ca6ec3f0 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -2013,30 +2013,6 @@ static void malloc_consolidate (mstate);
# define weak_variable weak_function
#endif
-/* Forward declarations. */
-static void *malloc_hook_ini (size_t sz,
- const void *caller) __THROW;
-static void *realloc_hook_ini (void *ptr, size_t sz,
- const void *caller) __THROW;
-static void *memalign_hook_ini (size_t alignment, size_t sz,
- const void *caller) __THROW;
-
-#if HAVE_MALLOC_INIT_HOOK
-void (*__malloc_initialize_hook) (void) __attribute__ ((nocommon));
-compat_symbol (libc, __malloc_initialize_hook,
- __malloc_initialize_hook, GLIBC_2_0);
-#endif
-
-void weak_variable (*__free_hook) (void *__ptr,
- const void *) = NULL;
-void *weak_variable (*__malloc_hook)
- (size_t __size, const void *) = malloc_hook_ini;
-void *weak_variable (*__realloc_hook)
- (void *__ptr, size_t __size, const void *)
- = realloc_hook_ini;
-void *weak_variable (*__memalign_hook)
- (size_t __alignment, size_t __size, const void *)
- = memalign_hook_ini;
void weak_variable (*__after_morecore_hook) (void) = NULL;
/* This function is called from the arena shutdown hook, to free the
@@ -2065,6 +2041,9 @@ free_perturb (char *p, size_t n)
#include <stap-probe.h>
+/* ----------------- Support for debugging hooks -------------------- */
+#include "hooks.c"
+
/* ------------------- Support for multiple arenas -------------------- */
#include "arena.c"
@@ -2425,10 +2404,6 @@ do_check_malloc_state (mstate av)
#endif
-/* ----------------- Support for debugging hooks -------------------- */
-#include "hooks.c"
-
-
/* ----------- Routines dealing with system allocation -------------- */
/*
@@ -3225,13 +3200,12 @@ __libc_malloc (size_t bytes)
mstate ar_ptr;
void *victim;
- _Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2,
- "PTRDIFF_MAX is not more than half of SIZE_MAX");
+ if (__malloc_initialized < 0)
+ ptmalloc_init ();
+
+ if (_malloc_debug_before (bytes, &victim, RETURN_ADDRESS (0)))
+ return victim;
- void *(*hook) (size_t, const void *)
- = atomic_forced_read (__malloc_hook);
- if (__builtin_expect (hook != NULL, 0))
- return (*hook)(bytes, RETURN_ADDRESS (0));
#if USE_TCACHE
/* int_free also calls request2size, be careful to not pad twice. */
size_t tbytes;
@@ -3292,13 +3266,11 @@ __libc_free (void *mem)
mstate ar_ptr;
mchunkptr p; /* chunk corresponding to mem */
- void (*hook) (void *, const void *)
- = atomic_forced_read (__free_hook);
- if (__builtin_expect (hook != NULL, 0))
- {
- (*hook)(mem, RETURN_ADDRESS (0));
- return;
- }
+ if (__malloc_initialized < 0)
+ ptmalloc_init ();
+
+ if (_free_debug_before (mem, RETURN_ADDRESS (0)))
+ return;
if (mem == 0) /* free(0) has no effect */
return;
@@ -3351,10 +3323,11 @@ __libc_realloc (void *oldmem, size_t bytes)
void *newp; /* chunk to return */
- void *(*hook) (void *, size_t, const void *) =
- atomic_forced_read (__realloc_hook);
- if (__builtin_expect (hook != NULL, 0))
- return (*hook)(oldmem, bytes, RETURN_ADDRESS (0));
+ if (__malloc_initialized < 0)
+ ptmalloc_init ();
+
+ if (_realloc_debug_before (oldmem, bytes, &newp, RETURN_ADDRESS (0)))
+ return newp;
#if REALLOC_ZERO_BYTES_FREES
if (bytes == 0 && oldmem != NULL)
@@ -3490,6 +3463,9 @@ void *
__libc_memalign (size_t alignment, size_t bytes)
{
void *address = RETURN_ADDRESS (0);
+ if (__malloc_initialized < 0)
+ ptmalloc_init ();
+
return _mid_memalign (alignment, bytes, address);
}
@@ -3499,10 +3475,8 @@ _mid_memalign (size_t alignment, size_t bytes, void *address)
mstate ar_ptr;
void *p;
- void *(*hook) (size_t, size_t, const void *) =
- atomic_forced_read (__memalign_hook);
- if (__builtin_expect (hook != NULL, 0))
- return (*hook)(alignment, bytes, address);
+ if (_memalign_debug_before (alignment, bytes, &p, address))
+ return p;
/* If we need less alignment than we give anyway, just relay to malloc. */
if (alignment <= MALLOC_ALIGNMENT)
@@ -3612,16 +3586,11 @@ __libc_calloc (size_t n, size_t elem_size)
sz = bytes;
- void *(*hook) (size_t, const void *) =
- atomic_forced_read (__malloc_hook);
- if (__builtin_expect (hook != NULL, 0))
- {
- mem = (*hook)(sz, RETURN_ADDRESS (0));
- if (mem == 0)
- return 0;
+ if (__malloc_initialized < 0)
+ ptmalloc_init ();
- return memset (mem, 0, sz);
- }
+ if (_calloc_debug_before (sz, &mem, RETURN_ADDRESS (0)))
+ return mem;
MAYBE_INIT_TCACHE ();
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* [PATCH v3 05/10] glibc.malloc.check: Wean away from malloc hooks
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
` (3 preceding siblings ...)
2021-07-02 2:35 ` [PATCH v3 04/10] malloc: Move malloc hook references to hooks.c Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 06/10] mcheck: " Siddhesh Poyarekar
` (4 subsequent siblings)
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Set up a new internal debugging hooks flag variable and migrate
glibc.malloc.check to it so that it no longer uses the malloc hooks.
Reviewed-by: DJ Delorie <dj@redhat.com>
---
malloc/arena.c | 4 +--
malloc/hooks.c | 63 ++++++++++++++++++++++++++++++++++++++++++-
malloc/malloc-check.c | 30 ++++++---------------
malloc/malloc.c | 9 +------
4 files changed, 73 insertions(+), 33 deletions(-)
diff --git a/malloc/arena.c b/malloc/arena.c
index 1861d20006..357a3b0b30 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -210,7 +210,7 @@ TUNABLE_CALLBACK (set_mallopt_check) (tunable_val_t *valp)
{
int32_t value = (int32_t) valp->numval;
if (value != 0)
- __malloc_check_init ();
+ __malloc_debug_enable (MALLOC_CHECK_HOOK);
}
# define TUNABLE_CALLBACK_FNDECL(__name, __type) \
@@ -400,7 +400,7 @@ ptmalloc_init (void)
}
}
if (s && s[0] != '\0' && s[0] != '0')
- __malloc_check_init ();
+ __malloc_debug_enable (MALLOC_CHECK_HOOK);
#endif
#if HAVE_MALLOC_INIT_HOOK
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 4960aafd08..77855801c8 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -21,6 +21,8 @@
corrupt pointer is detected: do nothing (0), print an error message
(1), or call abort() (2). */
+# include <stdbool.h>
+
/* Define and initialize the hook variables. These weak definitions must
appear before any use of the variables in a function (arena.c uses one). */
#ifndef weak_variable
@@ -29,6 +31,14 @@
# define weak_variable weak_function
#endif
+/* The internal malloc debugging hooks. */
+enum malloc_debug_hooks
+{
+ MALLOC_NONE_HOOK = 0,
+ MALLOC_CHECK_HOOK = 1 << 0, /* MALLOC_CHECK_ or glibc.malloc.check. */
+};
+static unsigned __malloc_debugging_hooks;
+
/* Forward declarations. */
#if HAVE_MALLOC_INIT_HOOK
@@ -48,6 +58,24 @@ void *weak_variable (*__memalign_hook)
static void ptmalloc_init (void);
+static __always_inline bool
+__is_malloc_debug_enabled (enum malloc_debug_hooks flag)
+{
+ return __malloc_debugging_hooks & flag;
+}
+
+static __always_inline void
+__malloc_debug_enable (enum malloc_debug_hooks flag)
+{
+ __malloc_debugging_hooks |= flag;
+}
+
+static __always_inline void
+__malloc_debug_disable (enum malloc_debug_hooks flag)
+{
+ __malloc_debugging_hooks &= ~flag;
+}
+
#include "malloc-check.c"
static __always_inline bool
@@ -63,6 +91,12 @@ _malloc_debug_before (size_t bytes, void **victimp, const void *address)
*victimp = (*hook)(bytes, address);
return true;
}
+
+ if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ {
+ *victimp = malloc_check (bytes);
+ return true;
+ }
return false;
}
@@ -76,6 +110,12 @@ _free_debug_before (void *mem, const void *address)
(*hook)(mem, address);
return true;
}
+
+ if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ {
+ free_check (mem);
+ return true;
+ }
return false;
}
@@ -91,6 +131,12 @@ _realloc_debug_before (void *oldmem, size_t bytes, void **victimp,
return true;
}
+ if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ {
+ *victimp = realloc_check (oldmem, bytes);
+ return true;
+ }
+
return false;
}
@@ -105,6 +151,13 @@ _memalign_debug_before (size_t alignment, size_t bytes, void **victimp,
*victimp = (*hook)(alignment, bytes, address);
return true;
}
+
+ if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ {
+ *victimp = memalign_check (alignment, bytes);
+ return true;
+ }
+
return false;
}
@@ -120,6 +173,14 @@ _calloc_debug_before (size_t bytes, void **victimp, const void *address)
memset (*victimp, 0, bytes);
return true;
}
+
+ if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ {
+ *victimp = malloc_check (bytes);
+ if (*victimp != NULL)
+ memset (*victimp, 0, bytes);
+ return true;
+ }
return false;
}
@@ -195,7 +256,7 @@ malloc_set_state (void *msptr)
__realloc_hook = NULL;
__free_hook = NULL;
__memalign_hook = NULL;
- using_malloc_checking = 0;
+ __malloc_debug_disable (MALLOC_CHECK_HOOK);
/* Patch the dumped heap. We no longer try to integrate into the
existing heap. Instead, we mark the existing chunks as mmapped.
diff --git a/malloc/malloc-check.c b/malloc/malloc-check.c
index dcab880510..a85e519498 100644
--- a/malloc/malloc-check.c
+++ b/malloc/malloc-check.c
@@ -18,20 +18,6 @@
not, see <https://www.gnu.org/licenses/>. */
-/* Whether we are using malloc checking. */
-static int using_malloc_checking;
-
-/* Activate a standard set of debugging hooks. */
-void
-__malloc_check_init (void)
-{
- using_malloc_checking = 1;
- __malloc_hook = malloc_check;
- __free_hook = free_check;
- __realloc_hook = realloc_check;
- __memalign_hook = memalign_check;
-}
-
/* When memory is tagged, the checking data is stored in the user part
of the chunk. We can't rely on the user not having modified the
tags, so fetch the tag at each location before dereferencing
@@ -69,7 +55,7 @@ malloc_check_get_size (mchunkptr p)
unsigned char c;
unsigned char magic = magicbyte (p);
- assert (using_malloc_checking == 1);
+ assert (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK));
for (size = CHUNK_HDR_SZ + memsize (p) - 1;
(c = *SAFE_CHAR_OFFSET (p, size)) != magic;
@@ -203,7 +189,7 @@ top_check (void)
}
static void *
-malloc_check (size_t sz, const void *caller)
+malloc_check (size_t sz)
{
void *victim;
size_t nb;
@@ -222,7 +208,7 @@ malloc_check (size_t sz, const void *caller)
}
static void
-free_check (void *mem, const void *caller)
+free_check (void *mem)
{
mchunkptr p;
@@ -256,7 +242,7 @@ free_check (void *mem, const void *caller)
}
static void *
-realloc_check (void *oldmem, size_t bytes, const void *caller)
+realloc_check (void *oldmem, size_t bytes)
{
INTERNAL_SIZE_T chnb;
void *newmem = 0;
@@ -269,11 +255,11 @@ realloc_check (void *oldmem, size_t bytes, const void *caller)
return NULL;
}
if (oldmem == 0)
- return malloc_check (bytes, NULL);
+ return malloc_check (bytes);
if (bytes == 0)
{
- free_check (oldmem, NULL);
+ free_check (oldmem);
return NULL;
}
@@ -348,12 +334,12 @@ invert:
}
static void *
-memalign_check (size_t alignment, size_t bytes, const void *caller)
+memalign_check (size_t alignment, size_t bytes)
{
void *mem;
if (alignment <= MALLOC_ALIGNMENT)
- return malloc_check (bytes, NULL);
+ return malloc_check (bytes);
if (alignment < MINSIZE)
alignment = MINSIZE;
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 75ca6ec3f0..60753446a1 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1124,13 +1124,6 @@ static void munmap_chunk(mchunkptr p);
static mchunkptr mremap_chunk(mchunkptr p, size_t new_size);
#endif
-static void* malloc_check(size_t sz, const void *caller);
-static void free_check(void* mem, const void *caller);
-static void* realloc_check(void* oldmem, size_t bytes,
- const void *caller);
-static void* memalign_check(size_t alignment, size_t bytes,
- const void *caller);
-
/* ------------------ MMAP support ------------------ */
@@ -5078,7 +5071,7 @@ musable (void *mem)
p = mem2chunk (mem);
- if (__builtin_expect (using_malloc_checking == 1, 0))
+ if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
return malloc_check_get_size (p);
if (chunk_is_mmapped (p))
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* [PATCH v3 06/10] mcheck: Wean away from malloc hooks
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
` (4 preceding siblings ...)
2021-07-02 2:35 ` [PATCH v3 05/10] glibc.malloc.check: Wean away from malloc hooks Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 07/10] mtrace: " Siddhesh Poyarekar
` (3 subsequent siblings)
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Split the mcheck implementation into the debugging hooks and the user
visible implementation so that the debugging hooks (in mcheck-hooks.c)
can be embedded like malloc-check.c.
Further, add *_debug_after debugging hooks into malloc so that mcheck
can then be adapted to using the debugging hooks instead of fiddling
with hooks variables. This adds an extra conditional branch at the
end of the allocator functions but it should have minimal effect in
the default use case.
Initialization using -lmcheck now depends on a new exported variable
__libc_lmcheck which is a const flag that mcheck-init can override.
While this simplifies the mcheck implementation, it still does not
make the interface thread safe as access to its internal structures is
still unprotected.
---
include/malloc.h | 10 +-
malloc/Makefile | 7 +-
malloc/Versions | 3 +
malloc/arena.c | 5 +
malloc/hooks.c | 133 ++++--
malloc/malloc.c | 115 +++--
malloc/mcheck-hooks.c | 411 ++++++++++++++++++
malloc/mcheck-init.c | 14 +-
malloc/mcheck.c | 369 +---------------
sysdeps/mach/hurd/i386/libc.abilist | 1 +
sysdeps/unix/sysv/linux/aarch64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/alpha/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arc/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arm/be/libc.abilist | 1 +
sysdeps/unix/sysv/linux/arm/le/libc.abilist | 1 +
sysdeps/unix/sysv/linux/csky/libc.abilist | 1 +
sysdeps/unix/sysv/linux/hppa/libc.abilist | 1 +
sysdeps/unix/sysv/linux/i386/libc.abilist | 1 +
sysdeps/unix/sysv/linux/ia64/libc.abilist | 1 +
.../sysv/linux/m68k/coldfire/libc.abilist | 1 +
.../unix/sysv/linux/m68k/m680x0/libc.abilist | 1 +
.../sysv/linux/microblaze/be/libc.abilist | 1 +
.../sysv/linux/microblaze/le/libc.abilist | 1 +
.../sysv/linux/mips/mips32/fpu/libc.abilist | 1 +
.../sysv/linux/mips/mips32/nofpu/libc.abilist | 1 +
.../sysv/linux/mips/mips64/n32/libc.abilist | 1 +
.../sysv/linux/mips/mips64/n64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/nios2/libc.abilist | 1 +
.../linux/powerpc/powerpc32/fpu/libc.abilist | 1 +
.../powerpc/powerpc32/nofpu/libc.abilist | 1 +
.../linux/powerpc/powerpc64/be/libc.abilist | 1 +
.../linux/powerpc/powerpc64/le/libc.abilist | 1 +
.../unix/sysv/linux/riscv/rv32/libc.abilist | 1 +
.../unix/sysv/linux/riscv/rv64/libc.abilist | 1 +
.../unix/sysv/linux/s390/s390-32/libc.abilist | 1 +
.../unix/sysv/linux/s390/s390-64/libc.abilist | 1 +
sysdeps/unix/sysv/linux/sh/be/libc.abilist | 1 +
sysdeps/unix/sysv/linux/sh/le/libc.abilist | 1 +
.../sysv/linux/sparc/sparc32/libc.abilist | 1 +
.../sysv/linux/sparc/sparc64/libc.abilist | 1 +
.../unix/sysv/linux/x86_64/64/libc.abilist | 1 +
.../unix/sysv/linux/x86_64/x32/libc.abilist | 1 +
42 files changed, 651 insertions(+), 449 deletions(-)
create mode 100644 malloc/mcheck-hooks.c
diff --git a/include/malloc.h b/include/malloc.h
index b77761f74d..bb1123d9d3 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -4,6 +4,11 @@
# ifndef _ISOMAC
# include <rtld-malloc.h>
+# include <stdbool.h>
+# include <mcheck.h>
+
+struct malloc_state;
+typedef struct malloc_state *mstate;
/* In the GNU libc we rename the global variable
`__malloc_initialized' to `__libc_malloc_initialized'. */
@@ -11,8 +16,9 @@
/* Nonzero if the malloc is already initialized. */
extern int __malloc_initialized attribute_hidden;
-struct malloc_state;
-typedef struct malloc_state *mstate;
+enum mcheck_status __mcheck_checkptr (const void *) attribute_hidden;
+extern int __mcheck_initialize (void (*) (enum mcheck_status), bool)
+ attribute_hidden;
# endif /* !_ISOMAC */
diff --git a/malloc/Makefile b/malloc/Makefile
index 47013d44aa..76b8a18a7e 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -91,9 +91,7 @@ tests-exclude-mcheck = tst-mallocstate \
tst-malloc-usable-static \
tst-malloc-usable-static-tunables \
tst-malloc-usable-tunables \
- tst-malloc_info \
- tst-memalign \
- tst-posix_memalign
+ tst-malloc_info
tests-mcheck = $(filter-out $(tests-exclude-mcheck), $(tests))
@@ -272,7 +270,8 @@ $(objpfx)memusage: memusage.sh
# Extra dependencies
$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c \
- malloc-check.c
+ malloc-check.c \
+ mcheck-hooks.c
# Compile the tests with a flag which suppresses the mallopt call in
# the test skeleton.
diff --git a/malloc/Versions b/malloc/Versions
index 62e4698a08..e138eaa24b 100644
--- a/malloc/Versions
+++ b/malloc/Versions
@@ -67,6 +67,9 @@ libc {
GLIBC_2.33 {
mallinfo2;
}
+ GLIBC_2.34 {
+ __libc_lmcheck;
+ }
GLIBC_PRIVATE {
# Internal startup hook for libpthread.
__libc_malloc_pthread_startup;
diff --git a/malloc/arena.c b/malloc/arena.c
index 357a3b0b30..a8500a25c9 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -403,6 +403,11 @@ ptmalloc_init (void)
__malloc_debug_enable (MALLOC_CHECK_HOOK);
#endif
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
+ if (__libc_lmcheck)
+ __mcheck_initialize (NULL, false);
+#endif
+
#if HAVE_MALLOC_INIT_HOOK
void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook);
if (hook != NULL)
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 77855801c8..7b500e5671 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -36,6 +36,7 @@ enum malloc_debug_hooks
{
MALLOC_NONE_HOOK = 0,
MALLOC_CHECK_HOOK = 1 << 0, /* MALLOC_CHECK_ or glibc.malloc.check. */
+ MALLOC_MCHECK_HOOK = 1 << 1, /* mcheck() */
};
static unsigned __malloc_debugging_hooks;
@@ -77,113 +78,181 @@ __malloc_debug_disable (enum malloc_debug_hooks flag)
}
#include "malloc-check.c"
+#include "mcheck-hooks.c"
static __always_inline bool
-_malloc_debug_before (size_t bytes, void **victimp, const void *address)
+_malloc_debug_before (size_t *bytesp, void **victimp, const void *address)
{
_Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2,
- "PTRDIFF_MAX is not more than half of SIZE_MAX");
+ "PTRDIFF_MAX is not more than half of SIZE_MAX");
void *(*hook) (size_t, const void *)
= atomic_forced_read (__malloc_hook);
if (__builtin_expect (hook != NULL, 0))
{
- *victimp = (*hook)(bytes, address);
+ *victimp = (*hook)(*bytesp, address);
return true;
}
- if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ if (__glibc_unlikely (__malloc_debugging_hooks))
{
- *victimp = malloc_check (bytes);
- return true;
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
+ && malloc_mcheck_before (bytesp, victimp))
+ return true;
+ if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))
+ {
+ *victimp = malloc_check (*bytesp);
+ return true;
+ }
}
return false;
}
+static __always_inline void *
+_malloc_debug_after (void *mem, size_t bytes, const void *address)
+{
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
+ mem = malloc_mcheck_after (mem, bytes);
+ return mem;
+}
+
static __always_inline bool
-_free_debug_before (void *mem, const void *address)
+_free_debug_before (void **mem, const void *address)
{
void (*hook) (void *, const void *)
= atomic_forced_read (__free_hook);
if (__builtin_expect (hook != NULL, 0))
{
- (*hook)(mem, address);
+ (*hook)(*mem, address);
return true;
}
- if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ if (__glibc_unlikely (__malloc_debugging_hooks))
{
- free_check (mem);
- return true;
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
+ *mem = free_mcheck (*mem);
+ if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))
+ {
+ free_check (*mem);
+ return true;
+ }
}
return false;
}
static __always_inline bool
-_realloc_debug_before (void *oldmem, size_t bytes, void **victimp,
- const void *address)
+_realloc_debug_before (void **oldmem, size_t *bytesp, size_t *oldsize,
+ void **victimp, const void *address)
{
void *(*hook) (void *, size_t, const void *) =
atomic_forced_read (__realloc_hook);
if (__builtin_expect (hook != NULL, 0))
{
- *victimp = (*hook)(oldmem, bytes, address);
+ *victimp = (*hook)(*oldmem, *bytesp, address);
return true;
}
- if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ if (__glibc_unlikely (__malloc_debugging_hooks))
{
- *victimp = realloc_check (oldmem, bytes);
- return true;
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
+ && realloc_mcheck_before (oldmem, bytesp, oldsize, victimp))
+ return true;
+ if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))
+ {
+ *victimp = realloc_check (*oldmem, *bytesp);
+ return true;
+ }
}
return false;
}
+static __always_inline void *
+_realloc_debug_after (void *mem, void *oldmem, size_t bytes, size_t oldsize,
+ const void *address)
+{
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
+ mem = realloc_mcheck_after (mem, oldmem, bytes, oldsize);
+ return mem;
+}
+
static __always_inline bool
-_memalign_debug_before (size_t alignment, size_t bytes, void **victimp,
- const void *address)
+_memalign_debug_before (size_t alignment, size_t *bytesp, void **victimp,
+ const void *address)
{
void *(*hook) (size_t, size_t, const void *) =
atomic_forced_read (__memalign_hook);
if (__builtin_expect (hook != NULL, 0))
{
- *victimp = (*hook)(alignment, bytes, address);
+ *victimp = (*hook)(alignment, *bytesp, address);
return true;
}
-
- if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ if (__glibc_unlikely (__malloc_debugging_hooks))
{
- *victimp = memalign_check (alignment, bytes);
- return true;
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
+ && memalign_mcheck_before (alignment, bytesp, victimp))
+ return true;
+ if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))
+ {
+ *victimp = memalign_check (alignment, *bytesp);
+ return true;
+ }
}
return false;
}
+static __always_inline void *
+_memalign_debug_after (void *mem, size_t alignment, size_t bytes,
+ const void *address)
+{
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
+ mem = memalign_mcheck_after (mem, alignment, bytes);
+ return mem;
+}
+
static __always_inline bool
-_calloc_debug_before (size_t bytes, void **victimp, const void *address)
+_calloc_debug_before (size_t *bytesp, void **victimp, const void *address)
{
void *(*hook) (size_t, const void *) =
atomic_forced_read (__malloc_hook);
if (__builtin_expect (hook != NULL, 0))
{
- *victimp = (*hook)(bytes, address);
+ *victimp = (*hook)(*bytesp, address);
+
if (*victimp != NULL)
- memset (*victimp, 0, bytes);
+ memset (*victimp, 0, *bytesp);
+
return true;
}
- if (__glibc_unlikely (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK)))
+ /* Memory is zeroed out in the AFTER hook. */
+ if (__glibc_unlikely (__malloc_debugging_hooks))
{
- *victimp = malloc_check (bytes);
- if (*victimp != NULL)
- memset (*victimp, 0, bytes);
- return true;
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
+ && malloc_mcheck_before (bytesp, victimp))
+ return true;
+ if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))
+ {
+ *victimp = malloc_check (*bytesp);
+ return true;
+ }
}
return false;
}
+static __always_inline void *
+_calloc_debug_after (void *mem, size_t bytes, const void *address)
+{
+ if (__glibc_unlikely (__malloc_debugging_hooks) && mem != NULL)
+ {
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
+ mem = malloc_mcheck_after (mem, bytes);
+ memset (mem, 0, bytes);
+ }
+ return mem;
+}
+
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25)
/* Support for restoring dumped heaps contained in historic Emacs
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 60753446a1..c899619e50 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -3191,13 +3191,14 @@ void *
__libc_malloc (size_t bytes)
{
mstate ar_ptr;
- void *victim;
+ void *victim = NULL;
+ size_t orig_bytes = bytes;
if (__malloc_initialized < 0)
ptmalloc_init ();
- if (_malloc_debug_before (bytes, &victim, RETURN_ADDRESS (0)))
- return victim;
+ if (_malloc_debug_before (&bytes, &victim, RETURN_ADDRESS (0)))
+ goto out;
#if USE_TCACHE
/* int_free also calls request2size, be careful to not pad twice. */
@@ -3205,7 +3206,8 @@ __libc_malloc (size_t bytes)
if (!checked_request2size (bytes, &tbytes))
{
__set_errno (ENOMEM);
- return NULL;
+ victim = NULL;
+ goto out;
}
size_t tc_idx = csize2tidx (tbytes);
@@ -3217,7 +3219,8 @@ __libc_malloc (size_t bytes)
&& tcache->counts[tc_idx] > 0)
{
victim = tcache_get (tc_idx);
- return tag_new_usable (victim);
+ victim = tag_new_usable (victim);
+ goto out;
}
DIAG_POP_NEEDS_COMMENT;
#endif
@@ -3227,7 +3230,7 @@ __libc_malloc (size_t bytes)
victim = tag_new_usable (_int_malloc (&main_arena, bytes));
assert (!victim || chunk_is_mmapped (mem2chunk (victim)) ||
&main_arena == arena_for_chunk (mem2chunk (victim)));
- return victim;
+ goto out;
}
arena_get (ar_ptr, bytes);
@@ -3249,7 +3252,9 @@ __libc_malloc (size_t bytes)
assert (!victim || chunk_is_mmapped (mem2chunk (victim)) ||
ar_ptr == arena_for_chunk (mem2chunk (victim)));
- return victim;
+
+out:
+ return _malloc_debug_after (victim, orig_bytes, RETURN_ADDRESS (0));
}
libc_hidden_def (__libc_malloc)
@@ -3262,7 +3267,7 @@ __libc_free (void *mem)
if (__malloc_initialized < 0)
ptmalloc_init ();
- if (_free_debug_before (mem, RETURN_ADDRESS (0)))
+ if (_free_debug_before (&mem, RETURN_ADDRESS (0)))
return;
if (mem == 0) /* free(0) has no effect */
@@ -3315,23 +3320,30 @@ __libc_realloc (void *oldmem, size_t bytes)
INTERNAL_SIZE_T nb; /* padded request size */
void *newp; /* chunk to return */
+ size_t orig_bytes = bytes, debug_osize = 0;
if (__malloc_initialized < 0)
ptmalloc_init ();
- if (_realloc_debug_before (oldmem, bytes, &newp, RETURN_ADDRESS (0)))
- return newp;
+ if (_realloc_debug_before (&oldmem, &bytes, &debug_osize, &newp,
+ RETURN_ADDRESS (0)))
+ goto out;
#if REALLOC_ZERO_BYTES_FREES
if (bytes == 0 && oldmem != NULL)
{
- __libc_free (oldmem); return 0;
+ __libc_free (oldmem);
+ newp = NULL;
+ goto out;
}
#endif
/* realloc of null is supposed to be same as malloc */
if (oldmem == 0)
- return __libc_malloc (bytes);
+ {
+ newp = __libc_malloc (bytes);
+ goto out;
+ }
/* Perform a quick check to ensure that the pointer's tag matches the
memory's tag. */
@@ -3365,7 +3377,8 @@ __libc_realloc (void *oldmem, size_t bytes)
if (!checked_request2size (bytes, &nb))
{
__set_errno (ENOMEM);
- return NULL;
+ newp = NULL;
+ goto out;
}
if (chunk_is_mmapped (oldp))
@@ -3377,7 +3390,10 @@ __libc_realloc (void *oldmem, size_t bytes)
/* Must alloc, copy, free. */
void *newmem = __libc_malloc (bytes);
if (newmem == 0)
- return NULL;
+ {
+ newp = NULL;
+ goto out;
+ }
/* Copy as many bytes as are available from the old chunk
and fit into the new size. NB: The overhead for faked
mmapped chunks is only SIZE_SZ, not CHUNK_HDR_SZ as for
@@ -3385,7 +3401,8 @@ __libc_realloc (void *oldmem, size_t bytes)
if (bytes > oldsize - SIZE_SZ)
bytes = oldsize - SIZE_SZ;
memcpy (newmem, oldmem, bytes);
- return newmem;
+ newp = newmem;
+ goto out;
}
void *newmem;
@@ -3400,21 +3417,29 @@ __libc_realloc (void *oldmem, size_t bytes)
reused. There's a performance hit for both us and the
caller for doing this, so we might want to
reconsider. */
- return tag_new_usable (newmem);
+ newp = tag_new_usable (newmem);
+ goto out;
}
#endif
/* Note the extra SIZE_SZ overhead. */
if (oldsize - SIZE_SZ >= nb)
- return oldmem; /* do nothing */
+ {
+ newp = oldmem; /* do nothing */
+ goto out;
+ }
/* Must alloc, copy, free. */
newmem = __libc_malloc (bytes);
if (newmem == 0)
- return 0; /* propagate failure */
+ {
+ newp = NULL; /* propagate failure */
+ goto out;
+ }
memcpy (newmem, oldmem, oldsize - CHUNK_HDR_SZ);
munmap_chunk (oldp);
- return newmem;
+ newp = newmem;
+ goto out;
}
if (SINGLE_THREAD_P)
@@ -3423,7 +3448,7 @@ __libc_realloc (void *oldmem, size_t bytes)
assert (!newp || chunk_is_mmapped (mem2chunk (newp)) ||
ar_ptr == arena_for_chunk (mem2chunk (newp)));
- return newp;
+ goto out;
}
__libc_lock_lock (ar_ptr->mutex);
@@ -3448,7 +3473,9 @@ __libc_realloc (void *oldmem, size_t bytes)
}
}
- return newp;
+out:
+ return _realloc_debug_after (newp, oldmem, orig_bytes, debug_osize,
+ RETURN_ADDRESS (0));
}
libc_hidden_def (__libc_realloc)
@@ -3467,13 +3494,17 @@ _mid_memalign (size_t alignment, size_t bytes, void *address)
{
mstate ar_ptr;
void *p;
+ size_t orig_bytes = bytes;
- if (_memalign_debug_before (alignment, bytes, &p, address))
- return p;
+ if (_memalign_debug_before (alignment, &bytes, &p, address))
+ goto out;
/* If we need less alignment than we give anyway, just relay to malloc. */
if (alignment <= MALLOC_ALIGNMENT)
- return __libc_malloc (bytes);
+ {
+ p = __libc_malloc (bytes);
+ goto out;
+ }
/* Otherwise, ensure that it is at least a minimum chunk size */
if (alignment < MINSIZE)
@@ -3484,7 +3515,8 @@ _mid_memalign (size_t alignment, size_t bytes, void *address)
if (alignment > SIZE_MAX / 2 + 1)
{
__set_errno (EINVAL);
- return 0;
+ p = NULL;
+ goto out;
}
@@ -3502,7 +3534,8 @@ _mid_memalign (size_t alignment, size_t bytes, void *address)
p = _int_memalign (&main_arena, alignment, bytes);
assert (!p || chunk_is_mmapped (mem2chunk (p)) ||
&main_arena == arena_for_chunk (mem2chunk (p)));
- return tag_new_usable (p);
+ p = tag_new_usable (p);
+ goto out;
}
arena_get (ar_ptr, bytes + alignment + MINSIZE);
@@ -3520,7 +3553,9 @@ _mid_memalign (size_t alignment, size_t bytes, void *address)
assert (!p || chunk_is_mmapped (mem2chunk (p)) ||
ar_ptr == arena_for_chunk (mem2chunk (p)));
- return tag_new_usable (p);
+ p = tag_new_usable (p);
+out:
+ return _memalign_debug_after (p, alignment, orig_bytes, RETURN_ADDRESS (0));
}
/* For ISO C11. */
weak_alias (__libc_memalign, aligned_alloc)
@@ -3582,8 +3617,8 @@ __libc_calloc (size_t n, size_t elem_size)
if (__malloc_initialized < 0)
ptmalloc_init ();
- if (_calloc_debug_before (sz, &mem, RETURN_ADDRESS (0)))
- return mem;
+ if (_calloc_debug_before (&sz, &mem, RETURN_ADDRESS (0)))
+ goto out;
MAYBE_INIT_TCACHE ();
@@ -3639,7 +3674,10 @@ __libc_calloc (size_t n, size_t elem_size)
/* Allocation failed even after a retry. */
if (mem == 0)
- return 0;
+ {
+ mem = NULL;
+ goto out;
+ }
mchunkptr p = mem2chunk (mem);
@@ -3647,7 +3685,10 @@ __libc_calloc (size_t n, size_t elem_size)
regardless of MORECORE_CLEARS, so we zero the whole block while
doing so. */
if (__glibc_unlikely (mtag_enabled))
- return tag_new_zero_region (mem, memsize (p));
+ {
+ mem = tag_new_zero_region (mem, memsize (p));
+ goto out;
+ }
INTERNAL_SIZE_T csz = chunksize (p);
@@ -3655,9 +3696,9 @@ __libc_calloc (size_t n, size_t elem_size)
if (chunk_is_mmapped (p))
{
if (__builtin_expect (perturb_byte, 0))
- return memset (mem, 0, sz);
+ memset (mem, 0, sz);
- return mem;
+ goto out;
}
#if MORECORE_CLEARS
@@ -3677,7 +3718,10 @@ __libc_calloc (size_t n, size_t elem_size)
assert (nclears >= 3);
if (nclears > 9)
- return memset (d, 0, clearsize);
+ {
+ memset (d, 0, clearsize);
+ goto out;
+ }
else
{
@@ -3701,7 +3745,8 @@ __libc_calloc (size_t n, size_t elem_size)
}
}
- return mem;
+out:
+ return _calloc_debug_after (mem, bytes, RETURN_ADDRESS (0));
}
/*
diff --git a/malloc/mcheck-hooks.c b/malloc/mcheck-hooks.c
new file mode 100644
index 0000000000..f3520c7659
--- /dev/null
+++ b/malloc/mcheck-hooks.c
@@ -0,0 +1,411 @@
+/* mcheck debugging hooks for malloc.
+ Copyright (C) 1990-2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Written May 1989 by Mike Haertel.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <mcheck.h>
+#include <libintl.h>
+
+/* Arbitrary magical numbers. */
+#define MAGICWORD 0xfedabeeb
+#define MAGICFREE 0xd8675309
+#define MAGICBYTE ((char) 0xd7)
+#define MALLOCFLOOD ((char) 0x93)
+#define FREEFLOOD ((char) 0x95)
+
+/* Function to call when something awful happens. */
+static void (*abortfunc) (enum mcheck_status);
+
+struct hdr
+{
+ size_t size; /* Exact size requested by user. */
+ unsigned long int magic; /* Magic number to check header integrity. */
+ struct hdr *prev;
+ struct hdr *next;
+ void *block; /* Real block allocated, for memalign. */
+ unsigned long int magic2; /* Extra, keeps us doubleword aligned. */
+};
+
+/* This is the beginning of the list of all memory blocks allocated.
+ It is only constructed if the pedantic testing is requested. */
+struct hdr *__mcheck_root;
+
+/* Nonzero if pedentic checking of all blocks is requested. */
+static bool pedantic;
+
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
+/* Flag to initialize mcheck on first malloc invocation through -lmcheck.
+ libmcheck.a overrides this with a strong symbol initialized to 1. The
+ symbol cannot be linked against directly during build. */
+const int __libc_lmcheck __attribute__ ((weak));
+compat_symbol (libc, __libc_lmcheck, __libc_lmcheck, GLIBC_2_34);
+#endif
+
+#if defined _LIBC || defined STDC_HEADERS || defined USG
+# include <string.h>
+# define flood memset
+#else
+static void flood (void *, int, size_t);
+static void
+flood (void *ptr, int val, size_t size)
+{
+ char *cp = ptr;
+ while (size--)
+ *cp++ = val;
+}
+#endif
+
+static enum mcheck_status
+checkhdr (const struct hdr *hdr)
+{
+ enum mcheck_status status;
+ bool mcheck_used = __is_malloc_debug_enabled (MALLOC_MCHECK_HOOK);
+
+ if (!mcheck_used)
+ /* Maybe the mcheck used is disabled? This happens when we find
+ an error and report it. */
+ return MCHECK_OK;
+
+ switch (hdr->magic ^ ((uintptr_t) hdr->prev + (uintptr_t) hdr->next))
+ {
+ default:
+ status = MCHECK_HEAD;
+ break;
+ case MAGICFREE:
+ status = MCHECK_FREE;
+ break;
+ case MAGICWORD:
+ if (((char *) &hdr[1])[hdr->size] != MAGICBYTE)
+ status = MCHECK_TAIL;
+ else if ((hdr->magic2 ^ (uintptr_t) hdr->block) != MAGICWORD)
+ status = MCHECK_HEAD;
+ else
+ status = MCHECK_OK;
+ break;
+ }
+ if (status != MCHECK_OK)
+ {
+ mcheck_used = 0;
+ (*abortfunc) (status);
+ mcheck_used = 1;
+ }
+ return status;
+}
+
+enum mcheck_status
+__mcheck_checkptr (const void *ptr)
+{
+ if (!__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
+ return MCHECK_DISABLED;
+
+ if (ptr != NULL)
+ return checkhdr (((struct hdr *) ptr) - 1);
+
+ /* Walk through all the active blocks and test whether they were tampered
+ with. */
+ struct hdr *runp = __mcheck_root;
+
+ /* Temporarily turn off the checks. */
+ pedantic = false;
+
+ while (runp != NULL)
+ {
+ (void) checkhdr (runp);
+
+ runp = runp->next;
+ }
+
+ /* Turn checks on again. */
+ pedantic = true;
+
+ return MCHECK_OK;
+}
+
+static void
+unlink_blk (struct hdr *ptr)
+{
+ if (ptr->next != NULL)
+ {
+ ptr->next->prev = ptr->prev;
+ ptr->next->magic = MAGICWORD ^ ((uintptr_t) ptr->next->prev
+ + (uintptr_t) ptr->next->next);
+ }
+ if (ptr->prev != NULL)
+ {
+ ptr->prev->next = ptr->next;
+ ptr->prev->magic = MAGICWORD ^ ((uintptr_t) ptr->prev->prev
+ + (uintptr_t) ptr->prev->next);
+ }
+ else
+ __mcheck_root = ptr->next;
+}
+
+static void
+link_blk (struct hdr *hdr)
+{
+ hdr->prev = NULL;
+ hdr->next = __mcheck_root;
+ __mcheck_root = hdr;
+ hdr->magic = MAGICWORD ^ (uintptr_t) hdr->next;
+
+ /* And the next block. */
+ if (hdr->next != NULL)
+ {
+ hdr->next->prev = hdr;
+ hdr->next->magic = MAGICWORD ^ ((uintptr_t) hdr
+ + (uintptr_t) hdr->next->next);
+ }
+}
+
+static void *
+free_mcheck (void *ptr)
+{
+ if (pedantic)
+ __mcheck_checkptr (NULL);
+ if (ptr)
+ {
+ struct hdr *hdr = ((struct hdr *) ptr) - 1;
+ checkhdr (hdr);
+ hdr->magic = MAGICFREE;
+ hdr->magic2 = MAGICFREE;
+ unlink_blk (hdr);
+ hdr->prev = hdr->next = NULL;
+ flood (ptr, FREEFLOOD, hdr->size);
+ ptr = hdr->block;
+ }
+ return ptr;
+}
+
+static bool
+malloc_mcheck_before (size_t *sizep, void **victimp)
+{
+ size_t size = *sizep;
+
+ if (pedantic)
+ __mcheck_checkptr (NULL);
+
+ if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1))
+ {
+ __set_errno (ENOMEM);
+ *victimp = NULL;
+ return true;
+ }
+
+ *sizep = sizeof (struct hdr) + size + 1;
+ return false;
+}
+
+static void *
+malloc_mcheck_after (void *mem, size_t size)
+{
+ struct hdr *hdr = mem;
+
+ if (hdr == NULL)
+ return NULL;
+
+ hdr->size = size;
+ link_blk (hdr);
+ hdr->block = hdr;
+ hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD;
+ ((char *) &hdr[1])[size] = MAGICBYTE;
+ flood ((void *) (hdr + 1), MALLOCFLOOD, size);
+ return (void *) (hdr + 1);
+}
+
+static bool
+memalign_mcheck_before (size_t alignment, size_t *sizep, void **victimp)
+{
+ struct hdr *hdr;
+ size_t slop, size = *sizep;
+
+ /* Punt to malloc to avoid double headers. */
+ if (alignment <= MALLOC_ALIGNMENT)
+ {
+ *victimp = __libc_malloc (size);
+ return true;
+ }
+
+ if (pedantic)
+ __mcheck_checkptr (NULL);
+
+ slop = (sizeof *hdr + alignment - 1) & - alignment;
+
+ if (size > ~((size_t) 0) - (slop + 1))
+ {
+ __set_errno (ENOMEM);
+ *victimp = NULL;
+ return true;
+ }
+
+ *sizep = slop + size + 1;
+ return false;
+}
+
+static void *
+memalign_mcheck_after (void *block, size_t alignment, size_t size)
+{
+ if (block == NULL)
+ return NULL;
+
+ /* This was served by __libc_malloc, so return as is. */
+ if (alignment <= MALLOC_ALIGNMENT)
+ return block;
+
+ size_t slop = (sizeof (struct hdr) + alignment - 1) & - alignment;
+ struct hdr *hdr = ((struct hdr *) (block + slop)) - 1;
+
+ hdr->size = size;
+ link_blk (hdr);
+ hdr->block = (void *) block;
+ hdr->magic2 = (uintptr_t) block ^ MAGICWORD;
+ ((char *) &hdr[1])[size] = MAGICBYTE;
+ flood ((void *) (hdr + 1), MALLOCFLOOD, size);
+ return (void *) (hdr + 1);
+}
+
+static bool
+realloc_mcheck_before (void **ptrp, size_t *sizep, size_t *oldsize,
+ void **victimp)
+{
+ size_t size = *sizep;
+ void *ptr = *ptrp;
+
+ /* Handle special cases to avoid adding multiple headers. */
+ if (size == 0)
+ {
+ __libc_free (ptr);
+ *victimp = NULL;
+ return true;
+ }
+
+ if (ptr == NULL)
+ {
+ *victimp = __libc_malloc (size);
+ *oldsize = 0;
+ return true;
+ }
+
+ if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1))
+ {
+ __set_errno (ENOMEM);
+ *victimp = NULL;
+ *oldsize = 0;
+ return true;
+ }
+
+ if (pedantic)
+ __mcheck_checkptr (NULL);
+
+ struct hdr *hdr;
+ size_t osize;
+
+ /* Update the oldptr for glibc realloc. */
+ *ptrp = hdr = ((struct hdr *) ptr) - 1;
+
+ osize = hdr->size;
+
+ checkhdr (hdr);
+ unlink_blk (hdr);
+ if (size < osize)
+ flood ((char *) ptr + size, FREEFLOOD, osize - size);
+
+ *oldsize = osize;
+ *sizep = sizeof (struct hdr) + size + 1;
+ return false;
+}
+
+static void *
+realloc_mcheck_after (void *ptr, void *oldptr, size_t size, size_t osize)
+{
+ struct hdr *hdr = ptr;
+
+ if (hdr == NULL)
+ return NULL;
+
+ /* Malloc already added the header so don't tamper with it. */
+ if (oldptr == NULL)
+ return ptr;
+
+ hdr->size = size;
+ link_blk (hdr);
+ hdr->block = hdr;
+ hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD;
+ ((char *) &hdr[1])[size] = MAGICBYTE;
+ if (size > osize)
+ flood ((char *) (hdr + 1) + osize, MALLOCFLOOD, size - osize);
+ return (void *) (hdr + 1);
+}
+
+__attribute__ ((noreturn))
+static void
+mabort (enum mcheck_status status)
+{
+ const char *msg;
+ switch (status)
+ {
+ case MCHECK_OK:
+ msg = _ ("memory is consistent, library is buggy\n");
+ break;
+ case MCHECK_HEAD:
+ msg = _ ("memory clobbered before allocated block\n");
+ break;
+ case MCHECK_TAIL:
+ msg = _ ("memory clobbered past end of allocated block\n");
+ break;
+ case MCHECK_FREE:
+ msg = _ ("block freed twice\n");
+ break;
+ default:
+ msg = _ ("bogus mcheck_status, library is buggy\n");
+ break;
+ }
+#ifdef _LIBC
+ __libc_fatal (msg);
+#else
+ fprintf (stderr, "mcheck: %s", msg);
+ fflush (stderr);
+ abort ();
+#endif
+}
+
+int
+__mcheck_initialize (void (*func) (enum mcheck_status), bool in_pedantic)
+{
+ abortfunc = (func != NULL) ? func : &mabort;
+
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
+ goto out;
+
+ switch (__malloc_initialized)
+ {
+ case -1:
+ ptmalloc_init ();
+ /* FALLTHROUGH */
+ case 0:
+ __malloc_debug_enable (MALLOC_MCHECK_HOOK);
+ break;
+ default:
+ break;
+ }
+
+ if (!__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
+ return -1;
+
+out:
+ pedantic = in_pedantic;
+ return 0;
+}
diff --git a/malloc/mcheck-init.c b/malloc/mcheck-init.c
index 9ee69ee5f8..e3d08ae05f 100644
--- a/malloc/mcheck-init.c
+++ b/malloc/mcheck-init.c
@@ -17,17 +17,7 @@
/* The object of this file should be installed as libmcheck.a,
so one can do -lmcheck to turn on mcheck. */
-
-#include <malloc.h>
-#include <mcheck.h>
#include <shlib-compat.h>
-static void
-turn_on_mcheck (void)
-{
- mcheck (NULL);
-}
-
-void (*__malloc_initialize_hook) (void) = turn_on_mcheck;
-compat_symbol_reference (libc, __malloc_initialize_hook,
- __malloc_initialize_hook, GLIBC_2_0);
+const int __libc_lmcheck = 1;
+compat_symbol_reference (libc, __libc_lmcheck, __libc_lmcheck, GLIBC_2_34);
diff --git a/malloc/mcheck.c b/malloc/mcheck.c
index 2a1fc645d4..f60766eded 100644
--- a/malloc/mcheck.c
+++ b/malloc/mcheck.c
@@ -1,4 +1,4 @@
-/* Standard debugging hooks for `malloc'.
+/* The mcheck() interface.
Copyright (C) 1990-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written May 1989 by Mike Haertel.
@@ -23,378 +23,22 @@
# include <mcheck.h>
# include <stdint.h>
# include <stdio.h>
-# include <libintl.h>
# include <errno.h>
#endif
-/* Old hook values. */
-static void (*old_free_hook)(void *ptr, const void *);
-static void *(*old_malloc_hook) (size_t size, const void *);
-static void *(*old_memalign_hook) (size_t alignment, size_t size,
- const void *);
-static void *(*old_realloc_hook) (void *ptr, size_t size,
- const void *);
-
-/* Function to call when something awful happens. */
-static void (*abortfunc) (enum mcheck_status);
-
-/* Arbitrary magical numbers. */
-#define MAGICWORD 0xfedabeeb
-#define MAGICFREE 0xd8675309
-#define MAGICBYTE ((char) 0xd7)
-#define MALLOCFLOOD ((char) 0x93)
-#define FREEFLOOD ((char) 0x95)
-
-struct hdr
-{
- size_t size; /* Exact size requested by user. */
- unsigned long int magic; /* Magic number to check header integrity. */
- struct hdr *prev;
- struct hdr *next;
- void *block; /* Real block allocated, for memalign. */
- unsigned long int magic2; /* Extra, keeps us doubleword aligned. */
-};
-
-/* This is the beginning of the list of all memory blocks allocated.
- It is only constructed if the pedantic testing is requested. */
-static struct hdr *root;
-
-static int mcheck_used;
-
-/* Nonzero if pedentic checking of all blocks is requested. */
-static int pedantic;
-
-#if defined _LIBC || defined STDC_HEADERS || defined USG
-# include <string.h>
-# define flood memset
-#else
-static void flood (void *, int, size_t);
-static void
-flood (void *ptr, int val, size_t size)
-{
- char *cp = ptr;
- while (size--)
- *cp++ = val;
-}
-#endif
-
-static enum mcheck_status
-checkhdr (const struct hdr *hdr)
-{
- enum mcheck_status status;
-
- if (!mcheck_used)
- /* Maybe the mcheck used is disabled? This happens when we find
- an error and report it. */
- return MCHECK_OK;
-
- switch (hdr->magic ^ ((uintptr_t) hdr->prev + (uintptr_t) hdr->next))
- {
- default:
- status = MCHECK_HEAD;
- break;
- case MAGICFREE:
- status = MCHECK_FREE;
- break;
- case MAGICWORD:
- if (((char *) &hdr[1])[hdr->size] != MAGICBYTE)
- status = MCHECK_TAIL;
- else if ((hdr->magic2 ^ (uintptr_t) hdr->block) != MAGICWORD)
- status = MCHECK_HEAD;
- else
- status = MCHECK_OK;
- break;
- }
- if (status != MCHECK_OK)
- {
- mcheck_used = 0;
- (*abortfunc) (status);
- mcheck_used = 1;
- }
- return status;
-}
-
void
mcheck_check_all (void)
{
- /* Walk through all the active blocks and test whether they were tampered
- with. */
- struct hdr *runp = root;
-
- /* Temporarily turn off the checks. */
- pedantic = 0;
-
- while (runp != NULL)
- {
- (void) checkhdr (runp);
-
- runp = runp->next;
- }
-
- /* Turn checks on again. */
- pedantic = 1;
+ __mcheck_checkptr (NULL);
}
#ifdef _LIBC
libc_hidden_def (mcheck_check_all)
#endif
-static void
-unlink_blk (struct hdr *ptr)
-{
- if (ptr->next != NULL)
- {
- ptr->next->prev = ptr->prev;
- ptr->next->magic = MAGICWORD ^ ((uintptr_t) ptr->next->prev
- + (uintptr_t) ptr->next->next);
- }
- if (ptr->prev != NULL)
- {
- ptr->prev->next = ptr->next;
- ptr->prev->magic = MAGICWORD ^ ((uintptr_t) ptr->prev->prev
- + (uintptr_t) ptr->prev->next);
- }
- else
- root = ptr->next;
-}
-
-static void
-link_blk (struct hdr *hdr)
-{
- hdr->prev = NULL;
- hdr->next = root;
- root = hdr;
- hdr->magic = MAGICWORD ^ (uintptr_t) hdr->next;
-
- /* And the next block. */
- if (hdr->next != NULL)
- {
- hdr->next->prev = hdr;
- hdr->next->magic = MAGICWORD ^ ((uintptr_t) hdr
- + (uintptr_t) hdr->next->next);
- }
-}
-static void
-freehook (void *ptr, const void *caller)
-{
- if (pedantic)
- mcheck_check_all ();
- if (ptr)
- {
- struct hdr *hdr = ((struct hdr *) ptr) - 1;
- checkhdr (hdr);
- hdr->magic = MAGICFREE;
- hdr->magic2 = MAGICFREE;
- unlink_blk (hdr);
- hdr->prev = hdr->next = NULL;
- flood (ptr, FREEFLOOD, hdr->size);
- ptr = hdr->block;
- }
- __free_hook = old_free_hook;
- if (old_free_hook != NULL)
- (*old_free_hook)(ptr, caller);
- else
- free (ptr);
- __free_hook = freehook;
-}
-
-static void *
-mallochook (size_t size, const void *caller)
-{
- struct hdr *hdr;
-
- if (pedantic)
- mcheck_check_all ();
-
- if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1))
- {
- __set_errno (ENOMEM);
- return NULL;
- }
-
- __malloc_hook = old_malloc_hook;
- if (old_malloc_hook != NULL)
- hdr = (struct hdr *) (*old_malloc_hook)(sizeof (struct hdr) + size + 1,
- caller);
- else
- hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1);
- __malloc_hook = mallochook;
- if (hdr == NULL)
- return NULL;
-
- hdr->size = size;
- link_blk (hdr);
- hdr->block = hdr;
- hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD;
- ((char *) &hdr[1])[size] = MAGICBYTE;
- flood ((void *) (hdr + 1), MALLOCFLOOD, size);
- return (void *) (hdr + 1);
-}
-
-static void *
-memalignhook (size_t alignment, size_t size,
- const void *caller)
-{
- struct hdr *hdr;
- size_t slop;
- char *block;
-
- if (pedantic)
- mcheck_check_all ();
-
- slop = (sizeof *hdr + alignment - 1) & - alignment;
-
- if (size > ~((size_t) 0) - (slop + 1))
- {
- __set_errno (ENOMEM);
- return NULL;
- }
-
- __memalign_hook = old_memalign_hook;
- if (old_memalign_hook != NULL)
- block = (*old_memalign_hook)(alignment, slop + size + 1, caller);
- else
- block = memalign (alignment, slop + size + 1);
- __memalign_hook = memalignhook;
- if (block == NULL)
- return NULL;
-
- hdr = ((struct hdr *) (block + slop)) - 1;
-
- hdr->size = size;
- link_blk (hdr);
- hdr->block = (void *) block;
- hdr->magic2 = (uintptr_t) block ^ MAGICWORD;
- ((char *) &hdr[1])[size] = MAGICBYTE;
- flood ((void *) (hdr + 1), MALLOCFLOOD, size);
- return (void *) (hdr + 1);
-}
-
-static void *
-reallochook (void *ptr, size_t size, const void *caller)
-{
- if (size == 0)
- {
- freehook (ptr, caller);
- return NULL;
- }
-
- struct hdr *hdr;
- size_t osize;
-
- if (pedantic)
- mcheck_check_all ();
-
- if (size > ~((size_t) 0) - (sizeof (struct hdr) + 1))
- {
- __set_errno (ENOMEM);
- return NULL;
- }
-
- if (ptr)
- {
- hdr = ((struct hdr *) ptr) - 1;
- osize = hdr->size;
-
- checkhdr (hdr);
- unlink_blk (hdr);
- if (size < osize)
- flood ((char *) ptr + size, FREEFLOOD, osize - size);
- }
- else
- {
- osize = 0;
- hdr = NULL;
- }
- __free_hook = old_free_hook;
- __malloc_hook = old_malloc_hook;
- __memalign_hook = old_memalign_hook;
- __realloc_hook = old_realloc_hook;
- if (old_realloc_hook != NULL)
- hdr = (struct hdr *) (*old_realloc_hook)((void *) hdr,
- sizeof (struct hdr) + size + 1,
- caller);
- else
- hdr = (struct hdr *) realloc ((void *) hdr,
- sizeof (struct hdr) + size + 1);
- __free_hook = freehook;
- __malloc_hook = mallochook;
- __memalign_hook = memalignhook;
- __realloc_hook = reallochook;
- if (hdr == NULL)
- return NULL;
-
- hdr->size = size;
- link_blk (hdr);
- hdr->block = hdr;
- hdr->magic2 = (uintptr_t) hdr ^ MAGICWORD;
- ((char *) &hdr[1])[size] = MAGICBYTE;
- if (size > osize)
- flood ((char *) (hdr + 1) + osize, MALLOCFLOOD, size - osize);
- return (void *) (hdr + 1);
-}
-
-__attribute__ ((noreturn))
-static void
-mabort (enum mcheck_status status)
-{
- const char *msg;
- switch (status)
- {
- case MCHECK_OK:
- msg = _ ("memory is consistent, library is buggy\n");
- break;
- case MCHECK_HEAD:
- msg = _ ("memory clobbered before allocated block\n");
- break;
- case MCHECK_TAIL:
- msg = _ ("memory clobbered past end of allocated block\n");
- break;
- case MCHECK_FREE:
- msg = _ ("block freed twice\n");
- break;
- default:
- msg = _ ("bogus mcheck_status, library is buggy\n");
- break;
- }
-#ifdef _LIBC
- __libc_fatal (msg);
-#else
- fprintf (stderr, "mcheck: %s", msg);
- fflush (stderr);
- abort ();
-#endif
-}
-
-/* Memory barrier so that GCC does not optimize out the argument. */
-#define malloc_opt_barrier(x) \
- ({ __typeof (x) __x = x; __asm ("" : "+m" (__x)); __x; })
-
int
mcheck (void (*func) (enum mcheck_status))
{
- abortfunc = (func != NULL) ? func : &mabort;
-
- /* These hooks may not be safely inserted if malloc is already in use. */
- if (__malloc_initialized <= 0 && !mcheck_used)
- {
- /* We call malloc() once here to ensure it is initialized. */
- void *p = malloc (0);
- /* GCC might optimize out the malloc/free pair without a barrier. */
- p = malloc_opt_barrier (p);
- free (p);
-
- old_free_hook = __free_hook;
- __free_hook = freehook;
- old_malloc_hook = __malloc_hook;
- __malloc_hook = mallochook;
- old_memalign_hook = __memalign_hook;
- __memalign_hook = memalignhook;
- old_realloc_hook = __realloc_hook;
- __realloc_hook = reallochook;
- mcheck_used = 1;
- }
-
- return mcheck_used ? 0 : -1;
+ return __mcheck_initialize (func, false);
}
#ifdef _LIBC
libc_hidden_def (mcheck)
@@ -403,14 +47,11 @@ libc_hidden_def (mcheck)
int
mcheck_pedantic (void (*func) (enum mcheck_status))
{
- int res = mcheck (func);
- if (res == 0)
- pedantic = 1;
- return res;
+ return __mcheck_initialize (func, true);
}
enum mcheck_status
mprobe (void *ptr)
{
- return mcheck_used ? checkhdr (((struct hdr *) ptr) - 1) : MCHECK_DISABLED;
+ return __mcheck_checkptr (ptr);
}
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index fcfe64f26b..27e8f14bb5 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2223,6 +2223,7 @@ GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
GLIBC_2.34 __isnanf128 F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 _hurd_libc_proc_init F
GLIBC_2.34 dladdr F
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index ea7fdabc5a..2265dad80a 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2376,6 +2376,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index 8b1adc918b..47fc4f6cf8 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2475,6 +2475,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist
index 740f39add4..8d1471b667 100644
--- a/sysdeps/unix/sysv/linux/arc/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arc/libc.abilist
@@ -2135,6 +2135,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
index 6f41d2c0fa..dfd4103860 100644
--- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist
@@ -221,6 +221,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
index 695f809fce..d3f6b8fd8c 100644
--- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist
@@ -218,6 +218,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist
index cc017b487f..ecf3a8b659 100644
--- a/sysdeps/unix/sysv/linux/csky/libc.abilist
+++ b/sysdeps/unix/sysv/linux/csky/libc.abilist
@@ -2349,6 +2349,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index b6b087d6ac..bb714a710c 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -2302,6 +2302,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index 40f740253b..a7b6d8b4ed 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2486,6 +2486,7 @@ GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
GLIBC_2.34 __isnanf128 F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index 157f244ea0..23bfd68b8f 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -2313,6 +2313,7 @@ GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
GLIBC_2.34 __isnanf128 F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index bbc40bb608..9e789900dd 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -222,6 +222,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index 5aba59e956..94eb746dd4 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -2429,6 +2429,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
index bfa665f086..f45ba3758a 100644
--- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist
@@ -2400,6 +2400,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
index cf93327b44..bae3991de7 100644
--- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist
@@ -2397,6 +2397,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index 1ff01ce150..827a4845de 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -2394,6 +2394,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index 104d8cbc02..a8c7bade80 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -2392,6 +2392,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index 6285d3c8f8..f7b45b1c57 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -2400,6 +2400,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index 6a4c1816d4..ea313e3df3 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -2364,6 +2364,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index 4cc199dbdb..2b98816248 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2439,6 +2439,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index 46a5759c0a..e0bb842406 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -2456,6 +2456,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index 10ac038d7c..3894dffc2e 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -2489,6 +2489,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
index eaa36b3fc7..ed2e897c77 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist
@@ -2277,6 +2277,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
index 9d7c55a4b5..d7f68309ec 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist
@@ -2572,6 +2572,7 @@ GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
GLIBC_2.34 __isnanf128 F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
index b902197ee9..f710c934a5 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist
@@ -2137,6 +2137,7 @@ GLIBC_2.33 write F
GLIBC_2.33 writev F
GLIBC_2.33 wscanf F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index 9609912bd5..cbd15300df 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2337,6 +2337,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index 8f11602d61..2b61b2bef5 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -2454,6 +2454,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index 876aa5ea80..dd87763a14 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -2314,6 +2314,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
index c4b037321b..c27f302acd 100644
--- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist
@@ -2309,6 +2309,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
index fbceadac42..0f7542cc8b 100644
--- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist
@@ -2306,6 +2306,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 12f050136c..f8239149d7 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -2449,6 +2449,7 @@ GLIBC_2.34 __glob64_time64 F
GLIBC_2.34 __globfree64_time64 F
GLIBC_2.34 __gmtime64 F
GLIBC_2.34 __gmtime64_r F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __localtime64 F
GLIBC_2.34 __localtime64_r F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index bc99f6f6d7..f2284b29ff 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -2336,6 +2336,7 @@ GLIBC_2.33 mknodat F
GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index 0d98e85292..7494e490cf 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -2292,6 +2292,7 @@ GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
GLIBC_2.34 __isnanf128 F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index b6d917c71e..2ddc8b8de6 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2391,6 +2391,7 @@ GLIBC_2.33 stat F
GLIBC_2.33 stat64 F
GLIBC_2.34 _Fork F
GLIBC_2.34 __isnanf128 F
+GLIBC_2.34 __libc_lmcheck D 0x4
GLIBC_2.34 __libc_start_main F
GLIBC_2.34 __mq_open_2 F
GLIBC_2.34 __pthread_cleanup_routine F
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* [PATCH v3 07/10] mtrace: Wean away from malloc hooks
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
` (5 preceding siblings ...)
2021-07-02 2:35 ` [PATCH v3 06/10] mcheck: " Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 08/10] Remove " Siddhesh Poyarekar
` (2 subsequent siblings)
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Split mtrace hooks into before and after and adapt to the new internal
debugging hooks infrastructure. With this, the malloc hooks are
unused internally and can be removed from the main library.
This also eliminates the only use of memalign through a PLT in the
library, so checklocalplt data needs to be updated to reflect that.
---
include/malloc.h | 1 +
malloc/Makefile | 3 +-
malloc/hooks.c | 40 ++-
malloc/mtrace-hooks.c | 137 ++++++++++
malloc/mtrace.c | 233 +-----------------
sysdeps/generic/localplt.data | 1 -
sysdeps/mach/hurd/i386/localplt.data | 1 -
sysdeps/unix/sysv/linux/aarch64/localplt.data | 1 -
sysdeps/unix/sysv/linux/alpha/localplt.data | 1 -
sysdeps/unix/sysv/linux/arc/localplt.data | 1 -
sysdeps/unix/sysv/linux/arm/localplt.data | 1 -
sysdeps/unix/sysv/linux/csky/localplt.data | 1 -
sysdeps/unix/sysv/linux/hppa/localplt.data | 1 -
sysdeps/unix/sysv/linux/i386/localplt.data | 1 -
sysdeps/unix/sysv/linux/ia64/localplt.data | 1 -
.../sysv/linux/m68k/coldfire/localplt.data | 1 -
.../unix/sysv/linux/m68k/m680x0/localplt.data | 1 -
.../unix/sysv/linux/microblaze/localplt.data | 1 -
sysdeps/unix/sysv/linux/nios2/localplt.data | 1 -
.../linux/powerpc/powerpc32/fpu/localplt.data | 1 -
.../powerpc/powerpc32/nofpu/localplt.data | 1 -
.../linux/powerpc/powerpc64/localplt.data | 1 -
sysdeps/unix/sysv/linux/riscv/localplt.data | 1 -
sysdeps/unix/sysv/linux/s390/localplt.data | 1 -
sysdeps/unix/sysv/linux/sh/localplt.data | 1 -
.../sysv/linux/sparc/sparc32/localplt.data | 1 -
.../sysv/linux/sparc/sparc64/localplt.data | 1 -
sysdeps/x86_64/localplt.data | 1 -
28 files changed, 184 insertions(+), 253 deletions(-)
create mode 100644 malloc/mtrace-hooks.c
diff --git a/include/malloc.h b/include/malloc.h
index bb1123d9d3..6169d486f5 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -15,6 +15,7 @@ typedef struct malloc_state *mstate;
#define __malloc_initialized __libc_malloc_initialized
/* Nonzero if the malloc is already initialized. */
extern int __malloc_initialized attribute_hidden;
+extern FILE *__mtrace_mallstream attribute_hidden;
enum mcheck_status __mcheck_checkptr (const void *) attribute_hidden;
extern int __mcheck_initialize (void (*) (enum mcheck_status), bool)
diff --git a/malloc/Makefile b/malloc/Makefile
index 76b8a18a7e..c9879c44e7 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -271,7 +271,8 @@ $(objpfx)memusage: memusage.sh
# Extra dependencies
$(foreach o,$(all-object-suffixes),$(objpfx)malloc$(o)): arena.c hooks.c \
malloc-check.c \
- mcheck-hooks.c
+ mcheck-hooks.c \
+ mtrace-hooks.c
# Compile the tests with a flag which suppresses the mallopt call in
# the test skeleton.
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 7b500e5671..7f3b07ca44 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -37,6 +37,7 @@ enum malloc_debug_hooks
MALLOC_NONE_HOOK = 0,
MALLOC_CHECK_HOOK = 1 << 0, /* MALLOC_CHECK_ or glibc.malloc.check. */
MALLOC_MCHECK_HOOK = 1 << 1, /* mcheck() */
+ MALLOC_MTRACE_HOOK = 1 << 2, /* mtrace() */
};
static unsigned __malloc_debugging_hooks;
@@ -79,6 +80,7 @@ __malloc_debug_disable (enum malloc_debug_hooks flag)
#include "malloc-check.c"
#include "mcheck-hooks.c"
+#include "mtrace-hooks.c"
static __always_inline bool
_malloc_debug_before (size_t *bytesp, void **victimp, const void *address)
@@ -111,8 +113,13 @@ _malloc_debug_before (size_t *bytesp, void **victimp, const void *address)
static __always_inline void *
_malloc_debug_after (void *mem, size_t bytes, const void *address)
{
- if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
- mem = malloc_mcheck_after (mem, bytes);
+ if (__glibc_unlikely (__malloc_debugging_hooks))
+ {
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
+ mem = malloc_mcheck_after (mem, bytes);
+ if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK))
+ mem = malloc_mtrace_after (mem, bytes, address);
+ }
return mem;
}
@@ -129,6 +136,8 @@ _free_debug_before (void **mem, const void *address)
if (__glibc_unlikely (__malloc_debugging_hooks))
{
+ if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK))
+ free_mtrace (mem, address);
if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
*mem = free_mcheck (*mem);
if (__is_malloc_debug_enabled (MALLOC_CHECK_HOOK))
@@ -171,8 +180,13 @@ static __always_inline void *
_realloc_debug_after (void *mem, void *oldmem, size_t bytes, size_t oldsize,
const void *address)
{
- if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
- mem = realloc_mcheck_after (mem, oldmem, bytes, oldsize);
+ if (__glibc_unlikely (__malloc_debugging_hooks))
+ {
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
+ mem = realloc_mcheck_after (mem, oldmem, bytes, oldsize);
+ if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK))
+ mem = realloc_mtrace_after (mem, oldmem, bytes, address);
+ }
return mem;
}
@@ -206,8 +220,13 @@ static __always_inline void *
_memalign_debug_after (void *mem, size_t alignment, size_t bytes,
const void *address)
{
- if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
- mem = memalign_mcheck_after (mem, alignment, bytes);
+ if (__glibc_unlikely (__malloc_debugging_hooks))
+ {
+ if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK) && mem != NULL)
+ mem = memalign_mcheck_after (mem, alignment, bytes);
+ if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK))
+ mem = memalign_mtrace_after (mem, bytes, address);
+ }
return mem;
}
@@ -244,11 +263,16 @@ _calloc_debug_before (size_t *bytesp, void **victimp, const void *address)
static __always_inline void *
_calloc_debug_after (void *mem, size_t bytes, const void *address)
{
- if (__glibc_unlikely (__malloc_debugging_hooks) && mem != NULL)
+ if (__glibc_unlikely (__malloc_debugging_hooks))
{
if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK))
mem = malloc_mcheck_after (mem, bytes);
- memset (mem, 0, bytes);
+ if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK))
+ mem = malloc_mtrace_after (mem, bytes, address);
+ /* mtrace uses __libc_calloc to do the zeroing. */
+ if (mem != NULL && __is_malloc_debug_enabled (MALLOC_CHECK_HOOK
+ | MALLOC_MCHECK_HOOK))
+ memset (mem, 0, bytes);
}
return mem;
}
diff --git a/malloc/mtrace-hooks.c b/malloc/mtrace-hooks.c
new file mode 100644
index 0000000000..c1c6d6a6e9
--- /dev/null
+++ b/malloc/mtrace-hooks.c
@@ -0,0 +1,137 @@
+
+# include <libc-lock.h>
+
+#include <kernel-features.h>
+
+FILE *__mtrace_mallstream;
+
+__libc_lock_define_initialized (static, lock);
+
+static void
+tr_where (const void *caller, Dl_info *info)
+{
+ if (caller != NULL)
+ {
+ if (info != NULL)
+ {
+ char *buf = (char *) "";
+ if (info->dli_sname != NULL)
+ {
+ size_t len = strlen (info->dli_sname);
+ buf = alloca (len + 6 + 2 * sizeof (void *));
+
+ buf[0] = '(';
+ __stpcpy (_fitoa (caller >= (const void *) info->dli_saddr
+ ? caller - (const void *) info->dli_saddr
+ : (const void *) info->dli_saddr - caller,
+ __stpcpy (__mempcpy (buf + 1, info->dli_sname,
+ len),
+ caller >= (void *) info->dli_saddr
+ ? "+0x" : "-0x"),
+ 16, 0),
+ ")");
+ }
+
+ fprintf (__mtrace_mallstream, "@ %s%s%s[%p] ",
+ info->dli_fname ? : "", info->dli_fname ? ":" : "",
+ buf, caller);
+ }
+ else
+ fprintf (__mtrace_mallstream, "@ [%p] ", caller);
+ }
+}
+
+static Dl_info *
+lock_and_info (const void *caller, Dl_info *mem)
+{
+ if (caller == NULL)
+ return NULL;
+
+ Dl_info *res = _dl_addr (caller, mem, NULL, NULL) ? mem : NULL;
+
+ __libc_lock_lock (lock);
+
+ return res;
+}
+
+static bool
+free_mtrace (void *ptr, const void *caller)
+{
+ if (ptr == NULL)
+ return true;
+
+ Dl_info mem;
+ Dl_info *info = lock_and_info (caller, &mem);
+ tr_where (caller, info);
+ /* Be sure to print it first. */
+ fprintf (__mtrace_mallstream, "- %p\n", ptr);
+ __libc_lock_unlock (lock);
+
+ /* Continue on to free. */
+ return false;
+}
+
+static void *
+malloc_mtrace_after (void *block, size_t size, const void *caller)
+{
+ Dl_info mem;
+ Dl_info *info = lock_and_info (caller, &mem);
+
+ tr_where (caller, info);
+ /* We could be printing a NULL here; that's OK. */
+ fprintf (__mtrace_mallstream, "+ %p %#lx\n", block,
+ (unsigned long int) size);
+
+ __libc_lock_unlock (lock);
+
+ return block;
+}
+
+static void *
+realloc_mtrace_after (void *block, const void *oldptr, size_t size,
+ const void *caller)
+{
+ Dl_info mem;
+ Dl_info *info = lock_and_info (caller, &mem);
+
+ tr_where (caller, info);
+ if (block == NULL)
+ {
+ if (size != 0)
+ /* Failed realloc. */
+ fprintf (__mtrace_mallstream, "! %p %#lx\n", oldptr,
+ (unsigned long int) size);
+ else
+ fprintf (__mtrace_mallstream, "- %p\n", oldptr);
+ }
+ else if (oldptr == NULL)
+ fprintf (__mtrace_mallstream, "+ %p %#lx\n", block,
+ (unsigned long int) size);
+ else
+ {
+ fprintf (__mtrace_mallstream, "< %p\n", oldptr);
+ tr_where (caller, info);
+ fprintf (__mtrace_mallstream, "> %p %#lx\n", block,
+ (unsigned long int) size);
+ }
+
+ __libc_lock_unlock (lock);
+
+ return block;
+}
+
+static void *
+memalign_mtrace_after (void *block, size_t size, const void *caller)
+{
+ Dl_info mem;
+ Dl_info *info = lock_and_info (caller, &mem);
+
+ tr_where (caller, info);
+ /* We could be printing a NULL here; that's OK. */
+ fprintf (__mtrace_mallstream, "+ %p %#lx\n", block,
+ (unsigned long int) size);
+
+ __libc_lock_unlock (lock);
+
+ return block;
+}
diff --git a/malloc/mtrace.c b/malloc/mtrace.c
index 6c2c58b706..2cc4507e25 100644
--- a/malloc/mtrace.c
+++ b/malloc/mtrace.c
@@ -22,7 +22,6 @@
# define _MALLOC_INTERNAL
# include <malloc.h>
# include <mcheck.h>
-# include <libc-lock.h>
#endif
#include <dlfcn.h>
@@ -35,20 +34,14 @@
#include <libc-internal.h>
#include <dso_handle.h>
-
#include <libio/iolibio.h>
#define setvbuf(s, b, f, l) _IO_setvbuf (s, b, f, l)
#define fwrite(buf, size, count, fp) _IO_fwrite (buf, size, count, fp)
-#include <kernel-features.h>
-
#define TRACE_BUFFER_SIZE 512
-static FILE *mallstream;
-static const char mallenv[] = "MALLOC_TRACE";
static char *malloc_trace_buffer;
-
-__libc_lock_define_initialized (static, lock);
+static const char mallenv[] = "MALLOC_TRACE";
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
/* Compatibility symbols that were introduced to help break at allocation sites
@@ -69,204 +62,6 @@ tr_break (void)
compat_symbol (libc, tr_break, tr_break, GLIBC_2_0);
#endif
-
-/* Old hook values. */
-static void (*tr_old_free_hook) (void *ptr, const void *);
-static void *(*tr_old_malloc_hook) (size_t size, const void *);
-static void *(*tr_old_realloc_hook) (void *ptr, size_t size,
- const void *);
-static void *(*tr_old_memalign_hook) (size_t __alignment, size_t __size,
- const void *);
-
-static void
-tr_where (const void *caller, Dl_info *info)
-{
- if (caller != NULL)
- {
- if (info != NULL)
- {
- char *buf = (char *) "";
- if (info->dli_sname != NULL)
- {
- size_t len = strlen (info->dli_sname);
- buf = alloca (len + 6 + 2 * sizeof (void *));
-
- buf[0] = '(';
- __stpcpy (_fitoa (caller >= (const void *) info->dli_saddr
- ? caller - (const void *) info->dli_saddr
- : (const void *) info->dli_saddr - caller,
- __stpcpy (__mempcpy (buf + 1, info->dli_sname,
- len),
- caller >= (void *) info->dli_saddr
- ? "+0x" : "-0x"),
- 16, 0),
- ")");
- }
-
- fprintf (mallstream, "@ %s%s%s[%p] ",
- info->dli_fname ? : "", info->dli_fname ? ":" : "",
- buf, caller);
- }
- else
- fprintf (mallstream, "@ [%p] ", caller);
- }
-}
-
-static Dl_info *
-lock_and_info (const void *caller, Dl_info *mem)
-{
- if (caller == NULL)
- return NULL;
-
- Dl_info *res = _dl_addr (caller, mem, NULL, NULL) ? mem : NULL;
-
- __libc_lock_lock (lock);
-
- return res;
-}
-
-static void tr_freehook (void *, const void *);
-static void * tr_mallochook (size_t, const void *);
-static void * tr_reallochook (void *, size_t, const void *);
-static void * tr_memalignhook (size_t, size_t, const void *);
-
-/* Set all the default non-trace hooks. */
-static __always_inline void
-set_default_hooks (void)
-{
- __free_hook = tr_old_free_hook;
- __malloc_hook = tr_old_malloc_hook;
- __realloc_hook = tr_old_realloc_hook;
- __memalign_hook = tr_old_memalign_hook;
-}
-
-/* Set all of the tracing hooks used for mtrace. */
-static __always_inline void
-set_trace_hooks (void)
-{
- __free_hook = tr_freehook;
- __malloc_hook = tr_mallochook;
- __realloc_hook = tr_reallochook;
- __memalign_hook = tr_memalignhook;
-}
-
-/* Save the current set of hooks as the default hooks. */
-static __always_inline void
-save_default_hooks (void)
-{
- tr_old_free_hook = __free_hook;
- tr_old_malloc_hook = __malloc_hook;
- tr_old_realloc_hook = __realloc_hook;
- tr_old_memalign_hook = __memalign_hook;
-}
-
-static void
-tr_freehook (void *ptr, const void *caller)
-{
- if (ptr == NULL)
- return;
-
- Dl_info mem;
- Dl_info *info = lock_and_info (caller, &mem);
- tr_where (caller, info);
- /* Be sure to print it first. */
- fprintf (mallstream, "- %p\n", ptr);
- set_default_hooks ();
- if (tr_old_free_hook != NULL)
- (*tr_old_free_hook)(ptr, caller);
- else
- free (ptr);
- set_trace_hooks ();
- __libc_lock_unlock (lock);
-}
-
-static void *
-tr_mallochook (size_t size, const void *caller)
-{
- void *hdr;
-
- Dl_info mem;
- Dl_info *info = lock_and_info (caller, &mem);
-
- set_default_hooks ();
- if (tr_old_malloc_hook != NULL)
- hdr = (void *) (*tr_old_malloc_hook)(size, caller);
- else
- hdr = (void *) malloc (size);
- set_trace_hooks ();
-
- tr_where (caller, info);
- /* We could be printing a NULL here; that's OK. */
- fprintf (mallstream, "+ %p %#lx\n", hdr, (unsigned long int) size);
-
- __libc_lock_unlock (lock);
-
- return hdr;
-}
-
-static void *
-tr_reallochook (void *ptr, size_t size, const void *caller)
-{
- void *hdr;
-
- Dl_info mem;
- Dl_info *info = lock_and_info (caller, &mem);
-
- set_default_hooks ();
- if (tr_old_realloc_hook != NULL)
- hdr = (void *) (*tr_old_realloc_hook)(ptr, size, caller);
- else
- hdr = (void *) realloc (ptr, size);
- set_trace_hooks ();
-
- tr_where (caller, info);
- if (hdr == NULL)
- {
- if (size != 0)
- /* Failed realloc. */
- fprintf (mallstream, "! %p %#lx\n", ptr, (unsigned long int) size);
- else
- fprintf (mallstream, "- %p\n", ptr);
- }
- else if (ptr == NULL)
- fprintf (mallstream, "+ %p %#lx\n", hdr, (unsigned long int) size);
- else
- {
- fprintf (mallstream, "< %p\n", ptr);
- tr_where (caller, info);
- fprintf (mallstream, "> %p %#lx\n", hdr, (unsigned long int) size);
- }
-
- __libc_lock_unlock (lock);
-
- return hdr;
-}
-
-static void *
-tr_memalignhook (size_t alignment, size_t size, const void *caller)
-{
- void *hdr;
-
- Dl_info mem;
- Dl_info *info = lock_and_info (caller, &mem);
-
- set_default_hooks ();
- if (tr_old_memalign_hook != NULL)
- hdr = (void *) (*tr_old_memalign_hook)(alignment, size, caller);
- else
- hdr = (void *) memalign (alignment, size);
- set_trace_hooks ();
-
- tr_where (caller, info);
- /* We could be printing a NULL here; that's OK. */
- fprintf (mallstream, "+ %p %#lx\n", hdr, (unsigned long int) size);
-
- __libc_lock_unlock (lock);
-
- return hdr;
-}
-
-
#ifdef _LIBC
/* This function gets called to make sure all memory the library
@@ -276,7 +71,7 @@ static void __libc_freeres_fn_section
release_libc_mem (void)
{
/* Only call the free function if we still are running in mtrace mode. */
- if (mallstream != NULL)
+ if (__mtrace_mallstream != NULL)
__libc_freeres ();
}
#endif
@@ -293,7 +88,7 @@ mtrace (void)
char *mallfile;
/* Don't panic if we're called more than once. */
- if (mallstream != NULL)
+ if (__mtrace_mallstream != NULL)
return;
#ifdef _LIBC
@@ -310,15 +105,15 @@ mtrace (void)
if (mtb == NULL)
return;
- mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null", "wce");
- if (mallstream != NULL)
+ __mtrace_mallstream = fopen (mallfile != NULL ? mallfile : "/dev/null",
+ "wce");
+ if (__mtrace_mallstream != NULL)
{
/* Be sure it doesn't malloc its buffer! */
malloc_trace_buffer = mtb;
- setvbuf (mallstream, malloc_trace_buffer, _IOFBF, TRACE_BUFFER_SIZE);
- fprintf (mallstream, "= Start\n");
- save_default_hooks ();
- set_trace_hooks ();
+ setvbuf (__mtrace_mallstream, malloc_trace_buffer, _IOFBF,
+ TRACE_BUFFER_SIZE);
+ fprintf (__mtrace_mallstream, "= Start\n");
#ifdef _LIBC
if (!added_atexit_handler)
{
@@ -336,15 +131,11 @@ mtrace (void)
void
muntrace (void)
{
- if (mallstream == NULL)
+ if (__mtrace_mallstream == NULL)
return;
- /* Do the reverse of what done in mtrace: first reset the hooks and
- MALLSTREAM, and only after that write the trailer and close the
- file. */
- FILE *f = mallstream;
- mallstream = NULL;
- set_default_hooks ();
+ FILE *f = __mtrace_mallstream;
+ __mtrace_mallstream = NULL;
fprintf (f, "= End\n");
fclose (f);
diff --git a/sysdeps/generic/localplt.data b/sysdeps/generic/localplt.data
index e2083c0ce6..9b4f35786a 100644
--- a/sysdeps/generic/localplt.data
+++ b/sysdeps/generic/localplt.data
@@ -4,7 +4,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/mach/hurd/i386/localplt.data b/sysdeps/mach/hurd/i386/localplt.data
index 94064ecbc5..47fbe1e2a7 100644
--- a/sysdeps/mach/hurd/i386/localplt.data
+++ b/sysdeps/mach/hurd/i386/localplt.data
@@ -6,7 +6,6 @@
libc.so: calloc + REL R_386_GLOB_DAT
libc.so: free + REL R_386_GLOB_DAT
libc.so: malloc + REL R_386_GLOB_DAT
-libc.so: memalign + REL R_386_GLOB_DAT
libc.so: realloc + REL R_386_GLOB_DAT
libm.so: matherr + REL R_386_GLOB_DAT
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/aarch64/localplt.data b/sysdeps/unix/sysv/linux/aarch64/localplt.data
index 2c14b652ef..348b3f3793 100644
--- a/sysdeps/unix/sysv/linux/aarch64/localplt.data
+++ b/sysdeps/unix/sysv/linux/aarch64/localplt.data
@@ -4,7 +4,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# If outline atomics are used, libgcc (built outside of glibc) may
diff --git a/sysdeps/unix/sysv/linux/alpha/localplt.data b/sysdeps/unix/sysv/linux/alpha/localplt.data
index 43f6fdaea1..44bf36f4f1 100644
--- a/sysdeps/unix/sysv/linux/alpha/localplt.data
+++ b/sysdeps/unix/sysv/linux/alpha/localplt.data
@@ -18,7 +18,6 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc + RELA R_ALPHA_GLOB_DAT
libc.so: free + RELA R_ALPHA_GLOB_DAT
libc.so: malloc + RELA R_ALPHA_GLOB_DAT
-libc.so: memalign + RELA R_ALPHA_GLOB_DAT
libc.so: realloc + RELA R_ALPHA_GLOB_DAT
libm.so: matherr + RELA R_ALPHA_GLOB_DAT
# We used to offer inline functions that used this, so it must be exported.
diff --git a/sysdeps/unix/sysv/linux/arc/localplt.data b/sysdeps/unix/sysv/linux/arc/localplt.data
index 4479e8ee8a..ac5332caf7 100644
--- a/sysdeps/unix/sysv/linux/arc/localplt.data
+++ b/sysdeps/unix/sysv/linux/arc/localplt.data
@@ -1,6 +1,5 @@
libc.so: realloc
libc.so: malloc
-libc.so: memalign
libc.so: calloc
libc.so: free
# At -Os, a struct assignment in libgcc-static pulls this in
diff --git a/sysdeps/unix/sysv/linux/arm/localplt.data b/sysdeps/unix/sysv/linux/arm/localplt.data
index eb315da2f1..78896444c6 100644
--- a/sysdeps/unix/sysv/linux/arm/localplt.data
+++ b/sysdeps/unix/sysv/linux/arm/localplt.data
@@ -1,7 +1,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: raise
libc.so: realloc
libm.so: matherr
diff --git a/sysdeps/unix/sysv/linux/csky/localplt.data b/sysdeps/unix/sysv/linux/csky/localplt.data
index 0ed8650b65..817ab2659a 100644
--- a/sysdeps/unix/sysv/linux/csky/localplt.data
+++ b/sysdeps/unix/sysv/linux/csky/localplt.data
@@ -4,7 +4,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
# The TLS-enabled version of these functions is interposed from libc.so.
ld.so: _dl_signal_error
diff --git a/sysdeps/unix/sysv/linux/hppa/localplt.data b/sysdeps/unix/sysv/linux/hppa/localplt.data
index 09893d4dcf..baf857a750 100644
--- a/sysdeps/unix/sysv/linux/hppa/localplt.data
+++ b/sysdeps/unix/sysv/linux/hppa/localplt.data
@@ -4,7 +4,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libc.so: __sigsetjmp
libc.so: _IO_funlockfile
diff --git a/sysdeps/unix/sysv/linux/i386/localplt.data b/sysdeps/unix/sysv/linux/i386/localplt.data
index 5334875b4b..f9bf7fb410 100644
--- a/sysdeps/unix/sysv/linux/i386/localplt.data
+++ b/sysdeps/unix/sysv/linux/i386/localplt.data
@@ -4,7 +4,6 @@ libc.so: _Unwind_Find_FDE + REL R_386_GLOB_DAT
libc.so: calloc + REL R_386_GLOB_DAT
libc.so: free + REL R_386_GLOB_DAT
libc.so: malloc + REL R_386_GLOB_DAT
-libc.so: memalign + REL R_386_GLOB_DAT
libc.so: realloc + REL R_386_GLOB_DAT
libm.so: matherr + REL R_386_GLOB_DAT
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/ia64/localplt.data b/sysdeps/unix/sysv/linux/ia64/localplt.data
index 1c566a503e..174fb88128 100644
--- a/sysdeps/unix/sysv/linux/ia64/localplt.data
+++ b/sysdeps/unix/sysv/linux/ia64/localplt.data
@@ -1,7 +1,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
libm.so: matherrf
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
index 3c5efb7204..42fa90508c 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
@@ -2,7 +2,6 @@ libc.so: __m68k_read_tp
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
index 843f4e25f2..34bd4c1aca 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
@@ -3,7 +3,6 @@ libc.so: __m68k_read_tp
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/microblaze/localplt.data b/sysdeps/unix/sysv/linux/microblaze/localplt.data
index 0e98d5251e..c3801314c9 100644
--- a/sysdeps/unix/sysv/linux/microblaze/localplt.data
+++ b/sysdeps/unix/sysv/linux/microblaze/localplt.data
@@ -2,7 +2,6 @@ libc.so: __errno_location
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The dynamic loader needs __tls_get_addr for TLS.
diff --git a/sysdeps/unix/sysv/linux/nios2/localplt.data b/sysdeps/unix/sysv/linux/nios2/localplt.data
index b37987c7c0..17fcfdd4db 100644
--- a/sysdeps/unix/sysv/linux/nios2/localplt.data
+++ b/sysdeps/unix/sysv/linux/nios2/localplt.data
@@ -6,7 +6,6 @@ libc.so: __gedf2
libc.so: malloc
libc.so: __gtsf2 ?
libc.so: __nesf2
-libc.so: memalign
libc.so: __mulsf3
libc.so: __floatunsisf
libc.so: __addsf3
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
index a02dd5cc24..c0af84eef7 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
@@ -2,7 +2,6 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
index d8072597b7..581e54b95c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
@@ -30,7 +30,6 @@ libc.so: abort ?
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: memset ?
libc.so: realloc
libm.so: copysignl ?
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
index bb498fbe3a..d69b7ae646 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
@@ -1,7 +1,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/riscv/localplt.data b/sysdeps/unix/sysv/linux/riscv/localplt.data
index 0a235592c3..e6d5330d5b 100644
--- a/sysdeps/unix/sysv/linux/riscv/localplt.data
+++ b/sysdeps/unix/sysv/linux/riscv/localplt.data
@@ -4,7 +4,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: memset ?
libc.so: realloc
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/s390/localplt.data b/sysdeps/unix/sysv/linux/s390/localplt.data
index a02dd5cc24..c0af84eef7 100644
--- a/sysdeps/unix/sysv/linux/s390/localplt.data
+++ b/sysdeps/unix/sysv/linux/s390/localplt.data
@@ -2,7 +2,6 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/sh/localplt.data b/sysdeps/unix/sysv/linux/sh/localplt.data
index 3225177c50..6491b9e37b 100644
--- a/sysdeps/unix/sysv/linux/sh/localplt.data
+++ b/sysdeps/unix/sysv/linux/sh/localplt.data
@@ -4,7 +4,6 @@
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libc.so: _Unwind_Find_FDE
libc.so: _exit
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
index be51efd566..38309a1393 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
@@ -16,7 +16,6 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
index 809062d46c..6a216f3a5a 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
@@ -15,7 +15,6 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
-libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/x86_64/localplt.data b/sysdeps/x86_64/localplt.data
index 8f41e92870..d1f2e26612 100644
--- a/sysdeps/x86_64/localplt.data
+++ b/sysdeps/x86_64/localplt.data
@@ -6,7 +6,6 @@
libc.so: calloc + RELA R_X86_64_GLOB_DAT
libc.so: free + RELA R_X86_64_GLOB_DAT
libc.so: malloc + RELA R_X86_64_GLOB_DAT
-libc.so: memalign + RELA R_X86_64_GLOB_DAT
libc.so: realloc + RELA R_X86_64_GLOB_DAT
libm.so: matherr + RELA R_X86_64_GLOB_DAT
# The TLS-enabled version of these functions is interposed from libc.so.
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* [PATCH v3 08/10] Remove malloc hooks
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
` (6 preceding siblings ...)
2021-07-02 2:35 ` [PATCH v3 07/10] mtrace: " Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 09/10] Remove __after_morecore_hook Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 10/10] Remove __morecore and __default_morecore Siddhesh Poyarekar
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Make malloc hooks symbols compat-only so that new applications cannot
link against them and remove the declarations from the API. The
existing hooks variables are not used in the library anymore.
Legacy applications that need hooks functionality need to preload a
new DSO libmalloc_compathooks.so, which interposes the libc malloc
functions to execute hooks if they exist.
Also remove all references to the malloc hooks in the manual. Mention
the removal in NEWS and also warn that libmalloc_compathooks.so is a
temporary measure and may be removed in a future version of glibc.
memalign makes a comeback as a PLT reference since the initialization
hooks use them. tst-mallocstate now needs libmalloc_compathooks.so
since it uses __malloc_initialize_hook to set up initial heap state to
emumate emacs.
Reviewed-by: DJ Delorie <dj@redhat.com>
---
Makeconfig | 2 +-
NEWS | 9 +
malloc/Makefile | 15 +-
malloc/arena.c | 5 -
malloc/hooks.c | 114 ++++++-----
malloc/malloc-compathooks.c | 166 +++++++++++++++
malloc/malloc.c | 10 -
malloc/malloc.h | 14 --
manual/memory.texi | 191 +-----------------
sysdeps/generic/localplt.data | 1 +
sysdeps/mach/hurd/i386/localplt.data | 1 +
sysdeps/unix/sysv/linux/aarch64/localplt.data | 1 +
sysdeps/unix/sysv/linux/alpha/localplt.data | 1 +
sysdeps/unix/sysv/linux/arc/localplt.data | 1 +
sysdeps/unix/sysv/linux/arm/localplt.data | 1 +
sysdeps/unix/sysv/linux/csky/localplt.data | 1 +
sysdeps/unix/sysv/linux/hppa/localplt.data | 1 +
sysdeps/unix/sysv/linux/i386/localplt.data | 1 +
sysdeps/unix/sysv/linux/ia64/localplt.data | 1 +
.../sysv/linux/m68k/coldfire/localplt.data | 1 +
.../unix/sysv/linux/m68k/m680x0/localplt.data | 1 +
.../unix/sysv/linux/microblaze/localplt.data | 1 +
sysdeps/unix/sysv/linux/nios2/localplt.data | 1 +
.../linux/powerpc/powerpc32/fpu/localplt.data | 1 +
.../powerpc/powerpc32/nofpu/localplt.data | 1 +
.../linux/powerpc/powerpc64/localplt.data | 1 +
sysdeps/unix/sysv/linux/riscv/localplt.data | 1 +
sysdeps/unix/sysv/linux/s390/localplt.data | 1 +
sysdeps/unix/sysv/linux/sh/localplt.data | 1 +
.../sysv/linux/sparc/sparc32/localplt.data | 1 +
.../sysv/linux/sparc/sparc64/localplt.data | 1 +
sysdeps/x86_64/localplt.data | 1 +
32 files changed, 284 insertions(+), 265 deletions(-)
create mode 100644 malloc/malloc-compathooks.c
diff --git a/Makeconfig b/Makeconfig
index 407df9e6a1..991d6d3e99 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -951,7 +951,7 @@ libio-include = -I$(..)libio
built-modules = iconvprogs iconvdata ldconfig lddlibc4 libmemusage \
libSegFault libpcprofile librpcsvc locale-programs \
memusagestat nonlib nscd extramodules libnldbl libsupport \
- testsuite
+ testsuite libmalloc_compathooks
in-module = $(subst -,_,$(firstword $(libof-$(basename $(@F))) \
$(libof-$(<F)) \
diff --git a/NEWS b/NEWS
index 8e72946c3f..cebe8384bf 100644
--- a/NEWS
+++ b/NEWS
@@ -97,6 +97,15 @@ Deprecated and removed features, and other changes affecting compatibility:
mtrace. Similar functionality can be achieved by using conditional
breakpoints within mtrace functions from within gdb.
+* The deprecated memory allocation hooks __malloc_hook, __realloc_hook,
+ __memalign_hook and __free_hook are now removed from the API. Compatibility
+ symbols are present to support legacy programs but new applications can no
+ longer link to these symbols. Further, the hooks no longer have any effect
+ on glibc functionality. A compatibility DSO libmalloc_compathooks.so has
+ been provided as a transitional measure to get hook functionality back for
+ legacy programs until they are updated to remove references to the memory
+ allocation hooks.
+
Changes to build and runtime requirements:
* On Linux, the shm_open, sem_open, and related functions now expect the
diff --git a/malloc/Makefile b/malloc/Makefile
index c9879c44e7..8674f5dc97 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -42,6 +42,7 @@ tests := mallocbug tst-malloc tst-valloc tst-calloc tst-obstack \
tst-malloc-stats-cancellation \
tst-tcfree1 tst-tcfree2 tst-tcfree3 \
tst-safe-linking \
+ tst-compathooks-off tst-compathooks-on
tests-static := \
tst-interpose-static-nothread \
@@ -113,8 +114,8 @@ routines = malloc morecore mcheck mtrace obstack reallocarray \
install-lib := libmcheck.a
non-lib.a := libmcheck.a
-# Additional library.
-extra-libs = libmemusage
+# Additional libraries.
+extra-libs = libmemusage libmalloc_compathooks
extra-libs-others = $(extra-libs)
# Helper objects for some tests.
@@ -129,6 +130,9 @@ test-extras = \
libmemusage-routines = memusage
libmemusage-inhibit-o = $(filter-out .os,$(object-suffixes))
+libmalloc_compathooks-routines = malloc-compathooks
+libmalloc_compathooks-inhibit-o = $(filter-out .os,$(object-suffixes))
+
$(objpfx)tst-malloc-backtrace: $(shared-thread-library)
$(objpfx)tst-malloc-thread-exit: $(shared-thread-library)
$(objpfx)tst-malloc-thread-fail: $(shared-thread-library)
@@ -319,3 +323,10 @@ $(objpfx)tst-mallocfork2-mcheck: $(shared-thread-library)
$(objpfx)tst-malloc-tcache-leak-malloc-check: $(shared-thread-library)
$(objpfx)tst-malloc_info-malloc-check: $(shared-thread-library)
$(objpfx)tst-mallocfork2-malloc-check: $(shared-thread-library)
+
+tst-compathooks-on-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-compathooks-on-mcheck-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-compathooks-on-malloc-check-ENV = \
+ LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-mallocstate-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
+tst-mallocstate-malloc-check-ENV = LD_PRELOAD=$(objpfx)libmalloc_compathooks.so
diff --git a/malloc/arena.c b/malloc/arena.c
index a8500a25c9..8591c8ea56 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -408,11 +408,6 @@ ptmalloc_init (void)
__mcheck_initialize (NULL, false);
#endif
-#if HAVE_MALLOC_INIT_HOOK
- void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook);
- if (hook != NULL)
- (*hook)();
-#endif
__malloc_initialized = 1;
}
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 7f3b07ca44..397220aaba 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -42,23 +42,84 @@ enum malloc_debug_hooks
static unsigned __malloc_debugging_hooks;
/* Forward declarations. */
+static void ptmalloc_init (void);
-#if HAVE_MALLOC_INIT_HOOK
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_24)
void (*__malloc_initialize_hook) (void) __attribute__ ((nocommon));
compat_symbol (libc, __malloc_initialize_hook,
__malloc_initialize_hook, GLIBC_2_0);
+
+# define MALLOC_INIT_HOOK() ({ \
+ void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook); \
+ if (hook != NULL) \
+ (*hook)(); \
+})
+#else
+# define MALLOC_INIT_HOOK()
#endif
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
+
+static void *malloc_hook_ini (size_t, const void *) __THROW;
+static void *realloc_hook_ini (void *, size_t, const void *) __THROW;
+static void *memalign_hook_ini (size_t, size_t, const void *) __THROW;
+
void weak_variable (*__free_hook) (void *__ptr,
const void *) = NULL;
void *weak_variable (*__malloc_hook)
- (size_t __size, const void *) = NULL;
+ (size_t __size, const void *) = malloc_hook_ini;
void *weak_variable (*__realloc_hook)
- (void *__ptr, size_t __size, const void *) = NULL;
+ (void *__ptr, size_t __size, const void *) = realloc_hook_ini;
void *weak_variable (*__memalign_hook)
- (size_t __alignment, size_t __size, const void *) = NULL;
+ (size_t __alignment, size_t __size, const void *) = memalign_hook_ini;
-static void ptmalloc_init (void);
+compat_symbol (libc, __free_hook, __free_hook, GLIBC_2_0);
+compat_symbol (libc, __malloc_hook, __malloc_hook, GLIBC_2_0);
+compat_symbol (libc, __realloc_hook, __realloc_hook, GLIBC_2_0);
+compat_symbol (libc, __memalign_hook, __memalign_hook, GLIBC_2_0);
+
+/* These hooks will get executed only through the interposed allocator
+ functions in libmalloc_compathooks. This means that the calls to malloc,
+ realloc, etc. will lead back into the interposed functions, which is what we
+ want.
+
+ These initial hooks are assumed to be called in a single-threaded context,
+ so it is safe to reset all hooks at once upon initialization. */
+
+static void
+generic_hook_ini (void)
+{
+ __malloc_hook = NULL;
+ __realloc_hook = NULL;
+ __memalign_hook = NULL;
+ if (__malloc_initialized < 0)
+ {
+ ptmalloc_init ();
+ MALLOC_INIT_HOOK ();
+ }
+}
+
+static void *
+malloc_hook_ini (size_t sz, const void *caller)
+{
+ generic_hook_ini ();
+ return malloc (sz);
+}
+
+static void *
+realloc_hook_ini (void *ptr, size_t sz, const void *caller)
+{
+ generic_hook_ini ();
+ return realloc (ptr, sz);
+}
+
+static void *
+memalign_hook_ini (size_t alignment, size_t sz, const void *caller)
+{
+ generic_hook_ini ();
+ return memalign (alignment, sz);
+}
+#endif
static __always_inline bool
__is_malloc_debug_enabled (enum malloc_debug_hooks flag)
@@ -88,14 +149,6 @@ _malloc_debug_before (size_t *bytesp, void **victimp, const void *address)
_Static_assert (PTRDIFF_MAX <= SIZE_MAX / 2,
"PTRDIFF_MAX is not more than half of SIZE_MAX");
- void *(*hook) (size_t, const void *)
- = atomic_forced_read (__malloc_hook);
- if (__builtin_expect (hook != NULL, 0))
- {
- *victimp = (*hook)(*bytesp, address);
- return true;
- }
-
if (__glibc_unlikely (__malloc_debugging_hooks))
{
if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
@@ -126,14 +179,6 @@ _malloc_debug_after (void *mem, size_t bytes, const void *address)
static __always_inline bool
_free_debug_before (void **mem, const void *address)
{
- void (*hook) (void *, const void *)
- = atomic_forced_read (__free_hook);
- if (__builtin_expect (hook != NULL, 0))
- {
- (*hook)(*mem, address);
- return true;
- }
-
if (__glibc_unlikely (__malloc_debugging_hooks))
{
if (__is_malloc_debug_enabled (MALLOC_MTRACE_HOOK))
@@ -153,14 +198,6 @@ static __always_inline bool
_realloc_debug_before (void **oldmem, size_t *bytesp, size_t *oldsize,
void **victimp, const void *address)
{
- void *(*hook) (void *, size_t, const void *) =
- atomic_forced_read (__realloc_hook);
- if (__builtin_expect (hook != NULL, 0))
- {
- *victimp = (*hook)(*oldmem, *bytesp, address);
- return true;
- }
-
if (__glibc_unlikely (__malloc_debugging_hooks))
{
if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
@@ -194,13 +231,6 @@ static __always_inline bool
_memalign_debug_before (size_t alignment, size_t *bytesp, void **victimp,
const void *address)
{
- void *(*hook) (size_t, size_t, const void *) =
- atomic_forced_read (__memalign_hook);
- if (__builtin_expect (hook != NULL, 0))
- {
- *victimp = (*hook)(alignment, *bytesp, address);
- return true;
- }
if (__glibc_unlikely (__malloc_debugging_hooks))
{
if (__is_malloc_debug_enabled (MALLOC_MCHECK_HOOK)
@@ -233,18 +263,6 @@ _memalign_debug_after (void *mem, size_t alignment, size_t bytes,
static __always_inline bool
_calloc_debug_before (size_t *bytesp, void **victimp, const void *address)
{
- void *(*hook) (size_t, const void *) =
- atomic_forced_read (__malloc_hook);
- if (__builtin_expect (hook != NULL, 0))
- {
- *victimp = (*hook)(*bytesp, address);
-
- if (*victimp != NULL)
- memset (*victimp, 0, *bytesp);
-
- return true;
- }
-
/* Memory is zeroed out in the AFTER hook. */
if (__glibc_unlikely (__malloc_debugging_hooks))
{
diff --git a/malloc/malloc-compathooks.c b/malloc/malloc-compathooks.c
new file mode 100644
index 0000000000..6d1eaab774
--- /dev/null
+++ b/malloc/malloc-compathooks.c
@@ -0,0 +1,166 @@
+/* Malloc hooks compatibility DSO.
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If
+ not, see <https://www.gnu.org/licenses/>. */
+
+#include <atomic.h>
+#include <libc-symbols.h>
+#include <shlib-compat.h>
+#include <string.h>
+#include <unistd.h>
+
+extern void (*__free_hook) (void *__ptr, const void *);
+compat_symbol_reference (libc, __free_hook, __free_hook, GLIBC_2_0);
+extern void * (*__malloc_hook) (size_t __size, const void *);
+compat_symbol_reference (libc, __malloc_hook, __malloc_hook, GLIBC_2_0);
+extern void * (*__realloc_hook)
+ (void *__ptr, size_t __size, const void *);
+compat_symbol_reference (libc, __realloc_hook, __realloc_hook, GLIBC_2_0);
+extern void * (*__memalign_hook)
+ (size_t __alignment, size_t __size, const void *);
+compat_symbol_reference (libc, __memalign_hook, __memalign_hook, GLIBC_2_0);
+
+/* Support only the glibc allocators. */
+extern void *__libc_malloc (size_t);
+extern void __libc_free (void *);
+extern void *__libc_realloc (void *, size_t);
+extern void *__libc_memalign (size_t, size_t);
+extern void *__libc_valloc (size_t);
+extern void *__libc_pvalloc (size_t);
+extern void *__libc_calloc (size_t, size_t);
+
+static size_t pagesize;
+
+/* The allocator functions. */
+
+static void *
+__compathook_malloc (size_t bytes)
+{
+ void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ return (*hook)(bytes, RETURN_ADDRESS (0));
+
+ return __libc_malloc (bytes);
+}
+strong_alias (__compathook_malloc, malloc)
+
+static void
+__compathook_free (void *mem)
+{
+ void (*hook) (void *, const void *) = atomic_forced_read (__free_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ (*hook)(mem, RETURN_ADDRESS (0));
+ return;
+ }
+ __libc_free (mem);
+}
+strong_alias (__compathook_free, free)
+
+static void *
+__compathook_realloc (void *oldmem, size_t bytes)
+{
+ void *(*hook) (void *, size_t, const void *) =
+ atomic_forced_read (__realloc_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ return (*hook)(oldmem, bytes, RETURN_ADDRESS (0));
+
+ return __libc_realloc (oldmem, bytes);
+}
+strong_alias (__compathook_realloc, realloc)
+
+static void *
+__compathook_memalign (size_t alignment, size_t bytes)
+{
+ void *(*hook) (size_t, size_t, const void *) =
+ atomic_forced_read (__memalign_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ return (*hook)(alignment, bytes, RETURN_ADDRESS (0));
+
+ return __libc_memalign (alignment, bytes);
+}
+strong_alias (__compathook_memalign, memalign)
+
+static void *
+__compathook_pvalloc (size_t bytes)
+{
+ void *(*hook) (size_t, size_t, const void *) =
+ atomic_forced_read (__memalign_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ size_t rounded_bytes;
+
+ if (!pagesize)
+ pagesize = sysconf (_SC_PAGESIZE);
+
+ /* ALIGN_UP with overflow check. */
+ if (__glibc_unlikely (__builtin_add_overflow (bytes,
+ pagesize - 1,
+ &rounded_bytes)))
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+ rounded_bytes = rounded_bytes & -(pagesize - 1);
+ return (*hook)(pagesize, rounded_bytes, RETURN_ADDRESS (0));
+ }
+
+ return __libc_pvalloc (bytes);
+}
+strong_alias (__compathook_pvalloc, pvalloc)
+
+static void *
+__compathook_valloc (size_t bytes)
+{
+ void *(*hook) (size_t, size_t, const void *) =
+ atomic_forced_read (__memalign_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ if (!pagesize)
+ pagesize = sysconf (_SC_PAGESIZE);
+
+ return (*hook)(pagesize, bytes, RETURN_ADDRESS (0));
+ }
+
+ return __libc_valloc (bytes);
+}
+strong_alias (__compathook_valloc, valloc)
+
+static void *
+__compathook_calloc (size_t nmemb, size_t size)
+{
+ void *(*hook) (size_t, const void *) = atomic_forced_read (__malloc_hook);
+ if (__builtin_expect (hook != NULL, 0))
+ {
+ size_t bytes;
+
+ if (__glibc_unlikely (__builtin_mul_overflow (nmemb, size, &bytes)))
+ {
+ errno = ENOMEM;
+ return NULL;
+ }
+
+ void *mem = (*hook)(bytes, RETURN_ADDRESS (0));
+
+ if (mem != NULL)
+ memset (mem, 0, bytes);
+
+ return mem;
+ }
+
+ return __libc_calloc (nmemb, size);
+}
+strong_alias (__compathook_calloc, calloc)
diff --git a/malloc/malloc.c b/malloc/malloc.c
index c899619e50..f6d7309721 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -570,16 +570,6 @@ tag_at (void *ptr)
#define HAVE_MREMAP 0
#endif
-/* We may need to support __malloc_initialize_hook for backwards
- compatibility. */
-
-#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_24)
-# define HAVE_MALLOC_INIT_HOOK 1
-#else
-# define HAVE_MALLOC_INIT_HOOK 0
-#endif
-
-
/*
This version of malloc supports the standard SVID/XPG mallinfo
routine that returns a struct containing usage properties and
diff --git a/malloc/malloc.h b/malloc/malloc.h
index c1c0896d29..709fa454b5 100644
--- a/malloc/malloc.h
+++ b/malloc/malloc.h
@@ -165,20 +165,6 @@ extern void malloc_stats (void) __THROW;
extern int malloc_info (int __options, FILE *__fp) __THROW;
/* Hooks for debugging and user-defined versions. */
-extern void (*__MALLOC_HOOK_VOLATILE __free_hook) (void *__ptr,
- const void *)
-__MALLOC_DEPRECATED;
-extern void *(*__MALLOC_HOOK_VOLATILE __malloc_hook)(size_t __size,
- const void *)
-__MALLOC_DEPRECATED;
-extern void *(*__MALLOC_HOOK_VOLATILE __realloc_hook)(void *__ptr,
- size_t __size,
- const void *)
-__MALLOC_DEPRECATED;
-extern void *(*__MALLOC_HOOK_VOLATILE __memalign_hook)(size_t __alignment,
- size_t __size,
- const void *)
-__MALLOC_DEPRECATED;
extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void)
__MALLOC_DEPRECATED;
diff --git a/manual/memory.texi b/manual/memory.texi
index 28ec2e4e63..e66ecd582d 100644
--- a/manual/memory.texi
+++ b/manual/memory.texi
@@ -328,8 +328,6 @@ any time (or never).
* Malloc Tunable Parameters:: Use @code{mallopt} to adjust allocation
parameters.
* Heap Consistency Checking:: Automatic checking for errors.
-* Hooks for Malloc:: You can use these hooks for debugging
- programs that use @code{malloc}.
* Statistics of Malloc:: Getting information about how much
memory your program is using.
* Summary of Malloc:: Summary of @code{malloc} and related functions.
@@ -1388,170 +1386,6 @@ compatibility. Both @code{MALLOC_CHECK_} and @samp{-lmcheck} should
uncover the same bugs - but using @code{MALLOC_CHECK_} you don't need to
recompile your application.
-@node Hooks for Malloc
-@subsubsection Memory Allocation Hooks
-@cindex allocation hooks, for @code{malloc}
-
-@Theglibc{} lets you modify the behavior of @code{malloc},
-@code{realloc}, and @code{free} by specifying appropriate hook
-functions. You can use these hooks to help you debug programs that use
-dynamic memory allocation, for example.
-
-The hook variables are declared in @file{malloc.h}.
-@pindex malloc.h
-
-@defvar __malloc_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to the function that
-@code{malloc} uses whenever it is called. You should define this
-function to look like @code{malloc}; that is, like:
-
-@smallexample
-void *@var{function} (size_t @var{size}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{malloc} function was called. This value allows you to trace
-the memory consumption of the program.
-@end defvar
-
-@defvar __realloc_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to function that @code{realloc}
-uses whenever it is called. You should define this function to look
-like @code{realloc}; that is, like:
-
-@smallexample
-void *@var{function} (void *@var{ptr}, size_t @var{size}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{realloc} function was called. This value allows you to trace the
-memory consumption of the program.
-@end defvar
-
-@defvar __free_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to function that @code{free}
-uses whenever it is called. You should define this function to look
-like @code{free}; that is, like:
-
-@smallexample
-void @var{function} (void *@var{ptr}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{free} function was called. This value allows you to trace the
-memory consumption of the program.
-@end defvar
-
-@defvar __memalign_hook
-@standards{GNU, malloc.h}
-The value of this variable is a pointer to function that @code{aligned_alloc},
-@code{memalign}, @code{posix_memalign} and @code{valloc} use whenever they
-are called. You should define this function to look like @code{aligned_alloc};
-that is, like:
-
-@smallexample
-void *@var{function} (size_t @var{alignment}, size_t @var{size}, const void *@var{caller})
-@end smallexample
-
-The value of @var{caller} is the return address found on the stack when
-the @code{aligned_alloc}, @code{memalign}, @code{posix_memalign} or
-@code{valloc} functions are called. This value allows you to trace the
-memory consumption of the program.
-@end defvar
-
-You must make sure that the function you install as a hook for one of
-these functions does not call that function recursively without restoring
-the old value of the hook first! Otherwise, your program will get stuck
-in an infinite recursion. Before calling the function recursively, one
-should make sure to restore all the hooks to their previous value. When
-coming back from the recursive call, all the hooks should be resaved
-since a hook might modify itself.
-
-An issue to look out for is the time at which the hook functions
-can be safely installed. If the hook functions call the @code{malloc}-related
-functions recursively, it is necessary that @code{malloc} has already properly
-initialized itself at the time when @code{__malloc_hook} etc. is
-assigned to. On the other hand, if the hook functions provide a
-complete @code{malloc} implementation of their own, it is vital that the hooks
-are assigned to @emph{before} the very first @code{malloc} call has
-completed, because otherwise a chunk obtained from the ordinary,
-un-hooked @code{malloc} may later be handed to @code{__free_hook}, for example.
-
-Here is an example showing how to use @code{__malloc_hook} and
-@code{__free_hook} properly. It installs a function that prints out
-information every time @code{malloc} or @code{free} is called. We just
-assume here that @code{realloc} and @code{memalign} are not used in our
-program.
-
-@smallexample
-/* Prototypes for __malloc_hook, __free_hook */
-#include <malloc.h>
-
-/* Prototypes for our hooks. */
-static void my_init_hook (void);
-static void *my_malloc_hook (size_t, const void *);
-static void my_free_hook (void*, const void *);
-
-static void
-my_init (void)
-@{
- old_malloc_hook = __malloc_hook;
- old_free_hook = __free_hook;
- __malloc_hook = my_malloc_hook;
- __free_hook = my_free_hook;
-@}
-
-static void *
-my_malloc_hook (size_t size, const void *caller)
-@{
- void *result;
- /* Restore all old hooks */
- __malloc_hook = old_malloc_hook;
- __free_hook = old_free_hook;
- /* Call recursively */
- result = malloc (size);
- /* Save underlying hooks */
- old_malloc_hook = __malloc_hook;
- old_free_hook = __free_hook;
- /* @r{@code{printf} might call @code{malloc}, so protect it too.} */
- printf ("malloc (%u) returns %p\n", (unsigned int) size, result);
- /* Restore our own hooks */
- __malloc_hook = my_malloc_hook;
- __free_hook = my_free_hook;
- return result;
-@}
-
-static void
-my_free_hook (void *ptr, const void *caller)
-@{
- /* Restore all old hooks */
- __malloc_hook = old_malloc_hook;
- __free_hook = old_free_hook;
- /* Call recursively */
- free (ptr);
- /* Save underlying hooks */
- old_malloc_hook = __malloc_hook;
- old_free_hook = __free_hook;
- /* @r{@code{printf} might call @code{free}, so protect it too.} */
- printf ("freed pointer %p\n", ptr);
- /* Restore our own hooks */
- __malloc_hook = my_malloc_hook;
- __free_hook = my_free_hook;
-@}
-
-main ()
-@{
- my_init ();
- @dots{}
-@}
-@end smallexample
-
-The @code{mcheck} function (@pxref{Heap Consistency Checking}) works by
-installing such hooks.
-
@c __morecore, __after_morecore_hook are undocumented
@c It's not clear whether to document them.
@@ -1686,19 +1520,6 @@ Tell @code{malloc} to perform occasional consistency checks on
dynamically allocated memory, and to call @var{abortfn} when an
inconsistency is found. @xref{Heap Consistency Checking}.
-@item void *(*__malloc_hook) (size_t @var{size}, const void *@var{caller})
-A pointer to a function that @code{malloc} uses whenever it is called.
-
-@item void *(*__realloc_hook) (void *@var{ptr}, size_t @var{size}, const void *@var{caller})
-A pointer to a function that @code{realloc} uses whenever it is called.
-
-@item void (*__free_hook) (void *@var{ptr}, const void *@var{caller})
-A pointer to a function that @code{free} uses whenever it is called.
-
-@item void (*__memalign_hook) (size_t @var{size}, size_t @var{alignment}, const void *@var{caller})
-A pointer to a function that @code{aligned_alloc}, @code{memalign},
-@code{posix_memalign} and @code{valloc} use whenever they are called.
-
@item struct mallinfo2 mallinfo2 (void)
Return information about the current dynamic memory usage.
@xref{Statistics of Malloc}.
@@ -1733,7 +1554,7 @@ penalties for the program if the debugging mode is not enabled.
@deftypefun void mtrace (void)
@standards{GNU, mcheck.h}
-@safety{@prelim{}@mtunsafe{@mtsenv{} @mtasurace{:mtrace} @mtasuconst{:malloc_hooks} @mtuinit{}}@asunsafe{@asuinit{} @ascuheap{} @asucorrupt{} @asulock{}}@acunsafe{@acuinit{} @acucorrupt{} @aculock{} @acsfd{} @acsmem{}}}
+@safety{@prelim{}@mtunsafe{@mtsenv{} @mtasurace{:mtrace} @mtuinit{}}@asunsafe{@asuinit{} @ascuheap{} @asucorrupt{} @asulock{}}@acunsafe{@acuinit{} @acucorrupt{} @aculock{} @acsfd{} @acsmem{}}}
@c Like the mcheck hooks, these are not designed with thread safety in
@c mind, because the hook pointers are temporarily modified without
@c regard to other threads, signals or cancellation.
@@ -1758,10 +1579,10 @@ with the SUID or SGID bit set.
If the named file is successfully opened, @code{mtrace} installs special
handlers for the functions @code{malloc}, @code{realloc}, and
-@code{free} (@pxref{Hooks for Malloc}). From then on, all uses of these
-functions are traced and protocolled into the file. There is now of
-course a speed penalty for all calls to the traced functions so tracing
-should not be enabled during normal use.
+@code{free}. From then on, all uses of these functions are traced and
+protocolled into the file. There is now of course a speed penalty for all
+calls to the traced functions so tracing should not be enabled during normal
+use.
This function is a GNU extension and generally not available on other
systems. The prototype can be found in @file{mcheck.h}.
@@ -1769,7 +1590,7 @@ systems. The prototype can be found in @file{mcheck.h}.
@deftypefun void muntrace (void)
@standards{GNU, mcheck.h}
-@safety{@prelim{}@mtunsafe{@mtasurace{:mtrace} @mtasuconst{:malloc_hooks} @mtslocale{}}@asunsafe{@asucorrupt{} @ascuheap{}}@acunsafe{@acucorrupt{} @acsmem{} @aculock{} @acsfd{}}}
+@safety{@prelim{}@mtunsafe{@mtasurace{:mtrace} @mtslocale{}}@asunsafe{@asucorrupt{} @ascuheap{}}@acunsafe{@acucorrupt{} @acsmem{} @aculock{} @acsfd{}}}
@c muntrace @mtasurace:mtrace @mtslocale @asucorrupt @ascuheap @acucorrupt @acsmem @aculock @acsfd
@c fprintf (fputs) dup @mtslocale @asucorrupt @ascuheap @acsmem @aculock @acucorrupt
diff --git a/sysdeps/generic/localplt.data b/sysdeps/generic/localplt.data
index 9b4f35786a..e2083c0ce6 100644
--- a/sysdeps/generic/localplt.data
+++ b/sysdeps/generic/localplt.data
@@ -4,6 +4,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/mach/hurd/i386/localplt.data b/sysdeps/mach/hurd/i386/localplt.data
index 47fbe1e2a7..94064ecbc5 100644
--- a/sysdeps/mach/hurd/i386/localplt.data
+++ b/sysdeps/mach/hurd/i386/localplt.data
@@ -6,6 +6,7 @@
libc.so: calloc + REL R_386_GLOB_DAT
libc.so: free + REL R_386_GLOB_DAT
libc.so: malloc + REL R_386_GLOB_DAT
+libc.so: memalign + REL R_386_GLOB_DAT
libc.so: realloc + REL R_386_GLOB_DAT
libm.so: matherr + REL R_386_GLOB_DAT
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/aarch64/localplt.data b/sysdeps/unix/sysv/linux/aarch64/localplt.data
index 348b3f3793..2c14b652ef 100644
--- a/sysdeps/unix/sysv/linux/aarch64/localplt.data
+++ b/sysdeps/unix/sysv/linux/aarch64/localplt.data
@@ -4,6 +4,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# If outline atomics are used, libgcc (built outside of glibc) may
diff --git a/sysdeps/unix/sysv/linux/alpha/localplt.data b/sysdeps/unix/sysv/linux/alpha/localplt.data
index 44bf36f4f1..43f6fdaea1 100644
--- a/sysdeps/unix/sysv/linux/alpha/localplt.data
+++ b/sysdeps/unix/sysv/linux/alpha/localplt.data
@@ -18,6 +18,7 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc + RELA R_ALPHA_GLOB_DAT
libc.so: free + RELA R_ALPHA_GLOB_DAT
libc.so: malloc + RELA R_ALPHA_GLOB_DAT
+libc.so: memalign + RELA R_ALPHA_GLOB_DAT
libc.so: realloc + RELA R_ALPHA_GLOB_DAT
libm.so: matherr + RELA R_ALPHA_GLOB_DAT
# We used to offer inline functions that used this, so it must be exported.
diff --git a/sysdeps/unix/sysv/linux/arc/localplt.data b/sysdeps/unix/sysv/linux/arc/localplt.data
index ac5332caf7..4479e8ee8a 100644
--- a/sysdeps/unix/sysv/linux/arc/localplt.data
+++ b/sysdeps/unix/sysv/linux/arc/localplt.data
@@ -1,5 +1,6 @@
libc.so: realloc
libc.so: malloc
+libc.so: memalign
libc.so: calloc
libc.so: free
# At -Os, a struct assignment in libgcc-static pulls this in
diff --git a/sysdeps/unix/sysv/linux/arm/localplt.data b/sysdeps/unix/sysv/linux/arm/localplt.data
index 78896444c6..eb315da2f1 100644
--- a/sysdeps/unix/sysv/linux/arm/localplt.data
+++ b/sysdeps/unix/sysv/linux/arm/localplt.data
@@ -1,6 +1,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: raise
libc.so: realloc
libm.so: matherr
diff --git a/sysdeps/unix/sysv/linux/csky/localplt.data b/sysdeps/unix/sysv/linux/csky/localplt.data
index 817ab2659a..0ed8650b65 100644
--- a/sysdeps/unix/sysv/linux/csky/localplt.data
+++ b/sysdeps/unix/sysv/linux/csky/localplt.data
@@ -4,6 +4,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
# The TLS-enabled version of these functions is interposed from libc.so.
ld.so: _dl_signal_error
diff --git a/sysdeps/unix/sysv/linux/hppa/localplt.data b/sysdeps/unix/sysv/linux/hppa/localplt.data
index baf857a750..09893d4dcf 100644
--- a/sysdeps/unix/sysv/linux/hppa/localplt.data
+++ b/sysdeps/unix/sysv/linux/hppa/localplt.data
@@ -4,6 +4,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libc.so: __sigsetjmp
libc.so: _IO_funlockfile
diff --git a/sysdeps/unix/sysv/linux/i386/localplt.data b/sysdeps/unix/sysv/linux/i386/localplt.data
index f9bf7fb410..5334875b4b 100644
--- a/sysdeps/unix/sysv/linux/i386/localplt.data
+++ b/sysdeps/unix/sysv/linux/i386/localplt.data
@@ -4,6 +4,7 @@ libc.so: _Unwind_Find_FDE + REL R_386_GLOB_DAT
libc.so: calloc + REL R_386_GLOB_DAT
libc.so: free + REL R_386_GLOB_DAT
libc.so: malloc + REL R_386_GLOB_DAT
+libc.so: memalign + REL R_386_GLOB_DAT
libc.so: realloc + REL R_386_GLOB_DAT
libm.so: matherr + REL R_386_GLOB_DAT
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/ia64/localplt.data b/sysdeps/unix/sysv/linux/ia64/localplt.data
index 174fb88128..1c566a503e 100644
--- a/sysdeps/unix/sysv/linux/ia64/localplt.data
+++ b/sysdeps/unix/sysv/linux/ia64/localplt.data
@@ -1,6 +1,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
libm.so: matherrf
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
index 42fa90508c..3c5efb7204 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/localplt.data
@@ -2,6 +2,7 @@ libc.so: __m68k_read_tp
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
index 34bd4c1aca..843f4e25f2 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/localplt.data
@@ -3,6 +3,7 @@ libc.so: __m68k_read_tp
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/microblaze/localplt.data b/sysdeps/unix/sysv/linux/microblaze/localplt.data
index c3801314c9..0e98d5251e 100644
--- a/sysdeps/unix/sysv/linux/microblaze/localplt.data
+++ b/sysdeps/unix/sysv/linux/microblaze/localplt.data
@@ -2,6 +2,7 @@ libc.so: __errno_location
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The dynamic loader needs __tls_get_addr for TLS.
diff --git a/sysdeps/unix/sysv/linux/nios2/localplt.data b/sysdeps/unix/sysv/linux/nios2/localplt.data
index 17fcfdd4db..b37987c7c0 100644
--- a/sysdeps/unix/sysv/linux/nios2/localplt.data
+++ b/sysdeps/unix/sysv/linux/nios2/localplt.data
@@ -6,6 +6,7 @@ libc.so: __gedf2
libc.so: malloc
libc.so: __gtsf2 ?
libc.so: __nesf2
+libc.so: memalign
libc.so: __mulsf3
libc.so: __floatunsisf
libc.so: __addsf3
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
index c0af84eef7..a02dd5cc24 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/localplt.data
@@ -2,6 +2,7 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
index 581e54b95c..d8072597b7 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/localplt.data
@@ -30,6 +30,7 @@ libc.so: abort ?
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: memset ?
libc.so: realloc
libm.so: copysignl ?
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
index d69b7ae646..bb498fbe3a 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/localplt.data
@@ -1,6 +1,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/riscv/localplt.data b/sysdeps/unix/sysv/linux/riscv/localplt.data
index e6d5330d5b..0a235592c3 100644
--- a/sysdeps/unix/sysv/linux/riscv/localplt.data
+++ b/sysdeps/unix/sysv/linux/riscv/localplt.data
@@ -4,6 +4,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: memset ?
libc.so: realloc
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/s390/localplt.data b/sysdeps/unix/sysv/linux/s390/localplt.data
index c0af84eef7..a02dd5cc24 100644
--- a/sysdeps/unix/sysv/linux/s390/localplt.data
+++ b/sysdeps/unix/sysv/linux/s390/localplt.data
@@ -2,6 +2,7 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/sh/localplt.data b/sysdeps/unix/sysv/linux/sh/localplt.data
index 6491b9e37b..3225177c50 100644
--- a/sysdeps/unix/sysv/linux/sh/localplt.data
+++ b/sysdeps/unix/sysv/linux/sh/localplt.data
@@ -4,6 +4,7 @@
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libc.so: _Unwind_Find_FDE
libc.so: _exit
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
index 38309a1393..be51efd566 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/localplt.data
@@ -16,6 +16,7 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
index 6a216f3a5a..809062d46c 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/localplt.data
@@ -15,6 +15,7 @@ libc.so: _Unwind_Find_FDE
libc.so: calloc
libc.so: free
libc.so: malloc
+libc.so: memalign
libc.so: realloc
libm.so: matherr
# The TLS-enabled version of these functions is interposed from libc.so.
diff --git a/sysdeps/x86_64/localplt.data b/sysdeps/x86_64/localplt.data
index d1f2e26612..8f41e92870 100644
--- a/sysdeps/x86_64/localplt.data
+++ b/sysdeps/x86_64/localplt.data
@@ -6,6 +6,7 @@
libc.so: calloc + RELA R_X86_64_GLOB_DAT
libc.so: free + RELA R_X86_64_GLOB_DAT
libc.so: malloc + RELA R_X86_64_GLOB_DAT
+libc.so: memalign + RELA R_X86_64_GLOB_DAT
libc.so: realloc + RELA R_X86_64_GLOB_DAT
libm.so: matherr + RELA R_X86_64_GLOB_DAT
# The TLS-enabled version of these functions is interposed from libc.so.
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* [PATCH v3 09/10] Remove __after_morecore_hook
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
` (7 preceding siblings ...)
2021-07-02 2:35 ` [PATCH v3 08/10] Remove " Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
2021-07-02 2:35 ` [PATCH v3 10/10] Remove __morecore and __default_morecore Siddhesh Poyarekar
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Remove __after_morecore_hook from the API and finalize the symbol so
that it can no longer be used in new applications. Old applications
using __after_morecore_hook will find that their hook is no longer
called.
Reviewed-by: DJ Delorie <dj@redhat.com>
---
malloc/hooks.c | 3 +++
malloc/malloc.c | 30 +-----------------------------
malloc/malloc.h | 5 -----
3 files changed, 4 insertions(+), 34 deletions(-)
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 397220aaba..5e9355761a 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -78,6 +78,9 @@ compat_symbol (libc, __malloc_hook, __malloc_hook, GLIBC_2_0);
compat_symbol (libc, __realloc_hook, __realloc_hook, GLIBC_2_0);
compat_symbol (libc, __memalign_hook, __memalign_hook, GLIBC_2_0);
+void weak_variable (*__after_morecore_hook) (void) = NULL;
+compat_symbol (libc, __after_morecore_hook, __after_morecore_hook, GLIBC_2_0);
+
/* These hooks will get executed only through the interposed allocator
functions in libmalloc_compathooks. This means that the calls to malloc,
realloc, etc. will lead back into the interposed functions, which is what we
diff --git a/malloc/malloc.c b/malloc/malloc.c
index f6d7309721..296e4f9789 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1988,16 +1988,6 @@ static void malloc_consolidate (mstate);
/* -------------- Early definitions for debugging hooks ---------------- */
-/* Define and initialize the hook variables. These weak definitions must
- appear before any use of the variables in a function (arena.c uses one). */
-#ifndef weak_variable
-/* In GNU libc we want the hook variables to be weak definitions to
- avoid a problem with Emacs. */
-# define weak_variable weak_function
-#endif
-
-void weak_variable (*__after_morecore_hook) (void) = NULL;
-
/* This function is called from the arena shutdown hook, to free the
thread cache (if it exists). */
static void tcache_thread_shutdown (void);
@@ -2622,14 +2612,7 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
LIBC_PROBE (memory_sbrk_more, 2, brk, size);
}
- if (brk != (char *) (MORECORE_FAILURE))
- {
- /* Call the `morecore' hook if necessary. */
- void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
- if (__builtin_expect (hook != NULL, 0))
- (*hook)();
- }
- else
+ if (brk == (char *) (MORECORE_FAILURE))
{
/*
If have mmap, try using it as a backup when MORECORE fails or
@@ -2768,13 +2751,6 @@ sysmalloc (INTERNAL_SIZE_T nb, mstate av)
correction = 0;
snd_brk = (char *) (MORECORE (0));
}
- else
- {
- /* Call the `morecore' hook if necessary. */
- void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
- if (__builtin_expect (hook != NULL, 0))
- (*hook)();
- }
}
/* handle non-contiguous cases */
@@ -2933,10 +2909,6 @@ systrim (size_t pad, mstate av)
*/
MORECORE (-extra);
- /* Call the `morecore' hook if necessary. */
- void (*hook) (void) = atomic_forced_read (__after_morecore_hook);
- if (__builtin_expect (hook != NULL, 0))
- (*hook)();
new_brk = (char *) (MORECORE (0));
LIBC_PROBE (memory_sbrk_less, 2, new_brk, extra);
diff --git a/malloc/malloc.h b/malloc/malloc.h
index 709fa454b5..d066a05d82 100644
--- a/malloc/malloc.h
+++ b/malloc/malloc.h
@@ -164,10 +164,5 @@ extern void malloc_stats (void) __THROW;
/* Output information about state of allocator to stream FP. */
extern int malloc_info (int __options, FILE *__fp) __THROW;
-/* Hooks for debugging and user-defined versions. */
-extern void (*__MALLOC_HOOK_VOLATILE __after_morecore_hook) (void)
- __MALLOC_DEPRECATED;
-
-
__END_DECLS
#endif /* malloc.h */
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread* [PATCH v3 10/10] Remove __morecore and __default_morecore
2021-07-02 2:35 [PATCH v3 00/10] Remove malloc hooks Siddhesh Poyarekar
` (8 preceding siblings ...)
2021-07-02 2:35 ` [PATCH v3 09/10] Remove __after_morecore_hook Siddhesh Poyarekar
@ 2021-07-02 2:35 ` Siddhesh Poyarekar
9 siblings, 0 replies; 28+ messages in thread
From: Siddhesh Poyarekar @ 2021-07-02 2:35 UTC (permalink / raw)
To: libc-alpha; +Cc: dj, carlos, fweimer
Make the __morecore and __default_morecore symbols compat-only and
remove their declarations from the API.
Reviewed-by: DJ Delorie <dj@redhat.com>
---
NEWS | 5 +++++
include/stdlib.h | 3 ---
malloc/arena.c | 12 ++----------
malloc/hooks.c | 3 +++
malloc/malloc-internal.h | 5 +++++
malloc/malloc.c | 4 +---
malloc/malloc.h | 8 --------
malloc/morecore.c | 15 +++++++++++++--
8 files changed, 29 insertions(+), 26 deletions(-)
diff --git a/NEWS b/NEWS
index cebe8384bf..2533919f75 100644
--- a/NEWS
+++ b/NEWS
@@ -106,6 +106,11 @@ Deprecated and removed features, and other changes affecting compatibility:
legacy programs until they are updated to remove references to the memory
allocation hooks.
+* The __morecore and __after_morecore_hook malloc hooks and the default
+ implementation __default_morecore have been removed from the API. Existing
+ applications will continue to link against these symbols but the interfaces
+ no longer have any effect on malloc.
+
Changes to build and runtime requirements:
* On Linux, the shm_open, sem_open, and related functions now expect the
diff --git a/include/stdlib.h b/include/stdlib.h
index 1f6e1508e4..1c6f70b082 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -306,9 +306,6 @@ libc_hidden_proto (__qfcvt_r)
# define MB_CUR_MAX (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_MB_CUR_MAX))
# endif
-extern void *__default_morecore (ptrdiff_t) __THROW;
-libc_hidden_proto (__default_morecore)
-
struct abort_msg_s
{
unsigned int size;
diff --git a/malloc/arena.c b/malloc/arena.c
index 8591c8ea56..00e8b5a32f 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -272,14 +272,6 @@ next_env_entry (char ***position)
#endif
-#if defined(SHARED) || defined(USE_MTAG)
-static void *
-__failing_morecore (ptrdiff_t d)
-{
- return (void *) MORECORE_FAILURE;
-}
-#endif
-
#ifdef SHARED
extern struct dl_open_hook *_dl_open_hook;
libc_hidden_proto (_dl_open_hook);
@@ -300,7 +292,7 @@ ptmalloc_init (void)
and that morecore does not support tagged regions, then
disable it. */
if (__MTAG_SBRK_UNTAGGED)
- __morecore = __failing_morecore;
+ __always_fail_morecore = true;
mtag_enabled = true;
mtag_mmap_flags = __MTAG_MMAP_FLAGS;
@@ -313,7 +305,7 @@ ptmalloc_init (void)
generic sbrk implementation also enforces this, but it is not
used on Hurd. */
if (!__libc_initial)
- __morecore = __failing_morecore;
+ __always_fail_morecore = true;
#endif
thread_arena = &main_arena;
diff --git a/malloc/hooks.c b/malloc/hooks.c
index 5e9355761a..b40696c8b7 100644
--- a/malloc/hooks.c
+++ b/malloc/hooks.c
@@ -81,6 +81,9 @@ compat_symbol (libc, __memalign_hook, __memalign_hook, GLIBC_2_0);
void weak_variable (*__after_morecore_hook) (void) = NULL;
compat_symbol (libc, __after_morecore_hook, __after_morecore_hook, GLIBC_2_0);
+void *(*__morecore)(ptrdiff_t);
+compat_symbol (libc, __morecore, __morecore, GLIBC_2_0);
+
/* These hooks will get executed only through the interposed allocator
functions in libmalloc_compathooks. This means that the calls to malloc,
realloc, etc. will lead back into the interposed functions, which is what we
diff --git a/malloc/malloc-internal.h b/malloc/malloc-internal.h
index ee0f5697af..b104f7cdbf 100644
--- a/malloc/malloc-internal.h
+++ b/malloc/malloc-internal.h
@@ -21,6 +21,7 @@
#include <malloc-machine.h>
#include <malloc-sysdep.h>
+#include <stdbool.h>
/* INTERNAL_SIZE_T is the word-size used for internal bookkeeping of
chunk sizes.
@@ -63,6 +64,8 @@
#define top(ar_ptr) ((ar_ptr)->top)
+extern bool __always_fail_morecore attribute_hidden;
+
/* Called in the parent process before a fork. */
void __malloc_fork_lock_parent (void) attribute_hidden;
@@ -78,4 +81,6 @@ void __malloc_arena_thread_freeres (void) attribute_hidden;
/* Activate a standard set of debugging hooks. */
void __malloc_check_init (void) attribute_hidden;
+extern void *__glibc_morecore (ptrdiff_t) attribute_hidden;
+
#endif /* _MALLOC_INTERNAL_H */
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 296e4f9789..79855e93ab 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -382,10 +382,8 @@ __malloc_assert (const char *assertion, const char *file, unsigned int line,
/* Definition for getting more memory from the OS. */
-#define MORECORE (*__morecore)
+#define MORECORE (*__glibc_morecore)
#define MORECORE_FAILURE 0
-void * __default_morecore (ptrdiff_t);
-void *(*__morecore)(ptrdiff_t) = __default_morecore;
/* Memory tagging. */
diff --git a/malloc/malloc.h b/malloc/malloc.h
index d066a05d82..2df0b38050 100644
--- a/malloc/malloc.h
+++ b/malloc/malloc.h
@@ -76,14 +76,6 @@ extern void *valloc (size_t __size) __THROW __attribute_malloc__
extern void *pvalloc (size_t __size) __THROW __attribute_malloc__
__wur __attr_dealloc_free;
-/* Underlying allocation function; successive calls should return
- contiguous pieces of memory. */
-extern void *(*__morecore) (ptrdiff_t __size) __MALLOC_DEPRECATED;
-
-/* Default value of `__morecore'. */
-extern void *__default_morecore (ptrdiff_t __size)
-__THROW __attribute_malloc__ __MALLOC_DEPRECATED;
-
/* SVID2/XPG mallinfo structure */
struct mallinfo
diff --git a/malloc/morecore.c b/malloc/morecore.c
index 047228779b..c85a85c0eb 100644
--- a/malloc/morecore.c
+++ b/malloc/morecore.c
@@ -38,16 +38,27 @@ libc_hidden_proto (__sbrk)
# define NULL 0
#endif
+#if defined(SHARED) || defined(USE_MTAG)
+bool __always_fail_morecore = false;
+#endif
+
/* Allocate INCREMENT more bytes of data space,
and return the start of data space, or NULL on errors.
If INCREMENT is negative, shrink data space. */
void *
-__default_morecore (ptrdiff_t increment)
+__glibc_morecore (ptrdiff_t increment)
{
+#if defined(SHARED) || defined(USE_MTAG)
+ if (__always_fail_morecore)
+ return NULL;
+#endif
+
void *result = (void *) __sbrk (increment);
if (result == (void *) -1)
return NULL;
return result;
}
-libc_hidden_def (__default_morecore)
+#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
+compat_symbol (libc, __glibc_morecore, __default_morecore, GLIBC_2_0);
+#endif
--
2.31.1
^ permalink raw reply [flat|nested] 28+ messages in thread