* [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen
@ 2021-03-22 15:41 Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 1/7] Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745) Vivek Das Mohapatra
` (8 more replies)
0 siblings, 9 replies; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
This is a revision of a previous patchset that I posted here
regarding https://sourceware.org/bugzilla/show_bug.cgi?id=22745
The only changes from v9 are the rewording of a mislocated comment
and the removal of © in favour of (C) in copyright comments.
Introduction:
=======================================================================
As discussed in the URL above dlmopen requires a mechanism for
[optionally] sharing some objects between more than one namespace.
The following patchset provides an implementation for this: If an
object is loaded with the new RTLD_SHARED flag we instead ensure
that a "master" copy exists (and is flagged as no-delete) in the
main namespace and a thin wrapper or clone is placed in the target
namespace.
This patch series should address all the comments received on the
earlier (v1-v8) series.
This series (v9) also lifts the requirement for an ld which supports
-z unique / DT_GNU_FLAGS_1+DF_GNU_1_UNIQUE directly. If lack of
support is detected the new dynamic flag section is added via linker
scripts and a dummy dynamic-notes.os object instead.
=======================================================================
In addition this patch series implements the following:
- dlmopen will implicitly apply RTLD_SHARED to the libc/libpthread group
(requires a patched binutils/ld so that the libc family DSOs can
be flagged as requiring this behaviour)
- binutils patchset accepted upstream;
- https://sourceware.org/git/?p=binutils-gdb.git
- commit 8a87b2791181eb7fc1533ffaeb95df8d87d41493
- LD_AUDIT paths will NOT apply this implict sharing rule:
audit libraries will continue to be completely isolated.
- The mechanism for tagging DSOs as implicitly shared has been changed
from a DT_FLAGS_1 flag to a DT_VALRNGHI/LO range dynamic section tag.
(Based on feedback on the binutils side of this patch series).
- DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE
- A flag RTLD_ISOLATE which is used inernally to suppress RTLD_SHARED
behaviour when audit libraries are being loaded, and is also made available
to users who really want a completely separate copy of glibc in their new
namespace.
- Tests for the new dlmopen behaviour
- Adds the unique dso flag to htl/libpthread.so as well as nptl
I have not yet implemented, but plan to address once this series is
accepted/acceptable:
- Sensible RTLD_GLOBAL semantics for dlmopened DSOs in non-base namespaces
- dl_iterate_ns_phdr (cf dl_iterate_phdr but taking a namespace argument)
Vivek Das Mohapatra (7):
Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745)
Abstract loaded-DSO search code into a helper function
Use the new DSO finder helper function
Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745)
Implement dlmopen RTLD_SHARED flag (bug 22745)
Add dlmopen / RTLD_SHARED tests
Restore separate libc loading for the TLS/namespace storage test
Makeconfig | 3 +
Makerules | 19 +-
bits/dlfcn.h | 10 +
config.make.in | 1 +
configure | 54 +-
configure.ac | 32 +-
dynamic-notes.c | 4 +
elf/Makefile | 104 +++-
elf/dl-close.c | 43 +-
elf/dl-fini.c | 6 +-
elf/dl-init.c | 4 +-
elf/dl-load.c | 221 ++++++-
elf/dl-object.c | 78 +++
elf/dl-open.c | 109 +++-
elf/dl-sym.c | 14 +
elf/elf.h | 7 +-
elf/get-dynamic-info.h | 12 +
elf/rtld.c | 2 +-
elf/tst-dlmopen-auditmod.c | 23 +
elf/tst-dlmopen-common.h | 32 +
elf/tst-dlmopen-main.h | 873 +++++++++++++++++++++++++++
elf/tst-dlmopen-modules.h | 21 +
elf/tst-dlmopen-rtld-audit-shared1.c | 8 +
elf/tst-dlmopen-rtld-audit-shared2.c | 8 +
elf/tst-dlmopen-rtld-audit-shared3.c | 7 +
elf/tst-dlmopen-rtld-audit-shared4.c | 8 +
elf/tst-dlmopen-rtld-audit-shared5.c | 8 +
elf/tst-dlmopen-rtld-audit-shared6.c | 8 +
elf/tst-dlmopen-rtld-audit-unique1.c | 7 +
elf/tst-dlmopen-rtld-audit-unique2.c | 7 +
elf/tst-dlmopen-rtld-audit-unique3.c | 7 +
elf/tst-dlmopen-rtld-audit-unique4.c | 7 +
elf/tst-dlmopen-rtld-audit-unique5.c | 7 +
elf/tst-dlmopen-rtld-audit-unique6.c | 7 +
elf/tst-dlmopen-rtld-shared1.c | 7 +
elf/tst-dlmopen-rtld-shared1.h | 64 ++
elf/tst-dlmopen-rtld-shared2.c | 7 +
elf/tst-dlmopen-rtld-shared2.h | 66 ++
elf/tst-dlmopen-rtld-shared3.c | 7 +
elf/tst-dlmopen-rtld-shared3.h | 43 ++
elf/tst-dlmopen-rtld-shared4.c | 7 +
elf/tst-dlmopen-rtld-shared4.h | 14 +
elf/tst-dlmopen-rtld-shared5.c | 7 +
elf/tst-dlmopen-rtld-shared5.h | 25 +
elf/tst-dlmopen-rtld-shared6.c | 7 +
elf/tst-dlmopen-rtld-shared6.h | 36 ++
elf/tst-dlmopen-rtld-unique1.c | 7 +
elf/tst-dlmopen-rtld-unique1.h | 86 +++
elf/tst-dlmopen-rtld-unique2.c | 7 +
elf/tst-dlmopen-rtld-unique2.h | 25 +
elf/tst-dlmopen-rtld-unique3.c | 7 +
elf/tst-dlmopen-rtld-unique3.h | 13 +
elf/tst-dlmopen-rtld-unique4.c | 7 +
elf/tst-dlmopen-rtld-unique4.h | 14 +
elf/tst-dlmopen-rtld-unique5.c | 7 +
elf/tst-dlmopen-rtld-unique5.h | 58 ++
elf/tst-dlmopen-rtld-unique6.c | 7 +
elf/tst-dlmopen-rtld-unique6.h | 51 ++
elf/tst-dlmopen-sharedmod-norm.c | 11 +
elf/tst-dlmopen-sharedmod-uniq.c | 11 +
elf/tst-dlmopen-std-do-test.c | 12 +
elf/tst-tls-ie-dlmopen.c | 4 +-
extra-lib.mk | 3 +
htl/Makefile | 3 +
iconvdata/Makefile | 3 +
iconvdata/extra-module.mk | 4 +
include/elf.h | 2 +
include/link.h | 7 +-
nptl/Makefile | 3 +
sysdeps/generic/ldsodefs.h | 9 +
sysdeps/mips/bits/dlfcn.h | 10 +
71 files changed, 2355 insertions(+), 67 deletions(-)
create mode 100644 dynamic-notes.c
create mode 100644 elf/tst-dlmopen-auditmod.c
create mode 100644 elf/tst-dlmopen-common.h
create mode 100644 elf/tst-dlmopen-main.h
create mode 100644 elf/tst-dlmopen-modules.h
create mode 100644 elf/tst-dlmopen-rtld-audit-shared1.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared2.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared3.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared4.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared5.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared6.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique1.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique2.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique3.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique4.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique5.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique6.c
create mode 100644 elf/tst-dlmopen-rtld-shared1.c
create mode 100644 elf/tst-dlmopen-rtld-shared1.h
create mode 100644 elf/tst-dlmopen-rtld-shared2.c
create mode 100644 elf/tst-dlmopen-rtld-shared2.h
create mode 100644 elf/tst-dlmopen-rtld-shared3.c
create mode 100644 elf/tst-dlmopen-rtld-shared3.h
create mode 100644 elf/tst-dlmopen-rtld-shared4.c
create mode 100644 elf/tst-dlmopen-rtld-shared4.h
create mode 100644 elf/tst-dlmopen-rtld-shared5.c
create mode 100644 elf/tst-dlmopen-rtld-shared5.h
create mode 100644 elf/tst-dlmopen-rtld-shared6.c
create mode 100644 elf/tst-dlmopen-rtld-shared6.h
create mode 100644 elf/tst-dlmopen-rtld-unique1.c
create mode 100644 elf/tst-dlmopen-rtld-unique1.h
create mode 100644 elf/tst-dlmopen-rtld-unique2.c
create mode 100644 elf/tst-dlmopen-rtld-unique2.h
create mode 100644 elf/tst-dlmopen-rtld-unique3.c
create mode 100644 elf/tst-dlmopen-rtld-unique3.h
create mode 100644 elf/tst-dlmopen-rtld-unique4.c
create mode 100644 elf/tst-dlmopen-rtld-unique4.h
create mode 100644 elf/tst-dlmopen-rtld-unique5.c
create mode 100644 elf/tst-dlmopen-rtld-unique5.h
create mode 100644 elf/tst-dlmopen-rtld-unique6.c
create mode 100644 elf/tst-dlmopen-rtld-unique6.h
create mode 100644 elf/tst-dlmopen-sharedmod-norm.c
create mode 100644 elf/tst-dlmopen-sharedmod-uniq.c
create mode 100644 elf/tst-dlmopen-std-do-test.c
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [RFC][PATCH v10 1/7] Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745)
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
@ 2021-03-22 15:41 ` Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 2/7] Abstract loaded-DSO search code into a helper function Vivek Das Mohapatra
` (7 subsequent siblings)
8 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
Define a new flags section DT_GNU_FLAGS_1 (no more bits are available
in DT_GNU_FLAGS).
One flag is currently defined: DF_GNU_1_UNIQUE.
libc and its companion DSOs (libpthread et al) should have this
section and flag set.
---
elf/elf.h | 7 ++++++-
elf/get-dynamic-info.h | 12 ++++++++++++
include/elf.h | 2 ++
include/link.h | 1 +
4 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/elf/elf.h b/elf/elf.h
index 2a62b98d4a..448c275d10 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -896,6 +896,7 @@ typedef struct
Dyn.d_un.d_val field of the Elf*_Dyn structure. This follows Sun's
approach. */
#define DT_VALRNGLO 0x6ffffd00
+#define DT_GNU_FLAGS_1 0x6ffffdf4 /* GNU extension flags */
#define DT_GNU_PRELINKED 0x6ffffdf5 /* Prelinking timestamp */
#define DT_GNU_CONFLICTSZ 0x6ffffdf6 /* Size of conflict section */
#define DT_GNU_LIBLISTSZ 0x6ffffdf7 /* Size of library list */
@@ -910,7 +911,7 @@ typedef struct
#define DT_SYMINENT 0x6ffffdff /* Entry size of syminfo */
#define DT_VALRNGHI 0x6ffffdff
#define DT_VALTAGIDX(tag) (DT_VALRNGHI - (tag)) /* Reverse order! */
-#define DT_VALNUM 12
+#define DT_VALNUM 13
/* DT_* entries which fall between DT_ADDRRNGHI & DT_ADDRRNGLO use the
Dyn.d_un.d_ptr field of the Elf*_Dyn structure.
@@ -999,6 +1000,10 @@ typedef struct
#define DF_1_WEAKFILTER 0x20000000
#define DF_1_NOCOMMON 0x40000000
+/* State flags selectable in the `d_un.d_val' element of the DT_GNU_FLAGS_1
+ entry in the dynamic section. */
+#define DF_GNU_1_UNIQUE 0x00000001 /* Load max 1 copy of this DSO. */
+
/* Flags for the feature selection in DT_FEATURE_1. */
#define DTF_1_PARINIT 0x00000001
#define DTF_1_CONFEXP 0x00000002
diff --git a/elf/get-dynamic-info.h b/elf/get-dynamic-info.h
index d8ec32377d..8082d84ba1 100644
--- a/elf/get-dynamic-info.h
+++ b/elf/get-dynamic-info.h
@@ -175,6 +175,18 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
if (l->l_flags_1 & DF_1_NOW)
info[DT_BIND_NOW] = info[VERSYMIDX (DT_FLAGS_1)];
}
+ if (info[DT_VALTAGIDX (DT_GNU_FLAGS_1)
+ + DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM + DT_EXTRANUM] != NULL)
+ {
+ l->l_gnu_flags_1 = info[DT_VALTAGIDX (DT_GNU_FLAGS_1)
+ + DT_NUM + DT_THISPROCNUM
+ + DT_VERSIONTAGNUM + DT_EXTRANUM]->d_un.d_val;
+
+ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES)
+ && l->l_gnu_flags_1 & ~DT_GNU_1_SUPPORTED_MASK)
+ _dl_debug_printf ("\nWARNING: Unsupported flag value(s) of 0x%x in DT_GNU_FLAGS_1.\n",
+ l->l_gnu_flags_1 & ~DT_GNU_1_SUPPORTED_MASK);
+ }
if (info[DT_RUNPATH] != NULL)
/* If both RUNPATH and RPATH are given, the latter is ignored. */
info[DT_RPATH] = NULL;
diff --git a/include/elf.h b/include/elf.h
index 14ed67ff67..5eee37c294 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -25,5 +25,7 @@
(DF_1_NOW | DF_1_NODELETE | DF_1_INITFIRST | DF_1_NOOPEN \
| DF_1_ORIGIN | DF_1_NODEFLIB | DF_1_PIE)
+#define DT_GNU_1_SUPPORTED_MASK DF_GNU_1_UNIQUE
+
#endif /* !_ISOMAC */
#endif /* elf.h */
diff --git a/include/link.h b/include/link.h
index 4af16cb596..6ed35eb808 100644
--- a/include/link.h
+++ b/include/link.h
@@ -283,6 +283,7 @@ struct link_map
unsigned int l_used;
/* Various flag words. */
+ ElfW(Word) l_gnu_flags_1;
ElfW(Word) l_feature_1;
ElfW(Word) l_flags_1;
ElfW(Word) l_flags;
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [RFC][PATCH v10 2/7] Abstract loaded-DSO search code into a helper function
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 1/7] Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745) Vivek Das Mohapatra
@ 2021-03-22 15:41 ` Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 3/7] Use the new DSO finder " Vivek Das Mohapatra
` (6 subsequent siblings)
8 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
---
elf/dl-load.c | 38 ++++++++++++++++++++++++++++++++++++++
sysdeps/generic/ldsodefs.h | 4 ++++
2 files changed, 42 insertions(+)
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 2f760503c5..3ffb83cb6a 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -2007,6 +2007,44 @@ open_path (const char *name, size_t namelen, int mode,
return -1;
}
+/* Search for a shared object in a given namespace. */
+struct link_map *
+_dl_find_dso (const char *name, Lmid_t nsid)
+{
+ struct link_map *l;
+
+ for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
+ {
+ /* If the requested name matches the soname of a loaded object,
+ use that object. Elide this check for names that have not
+ yet been opened. */
+ if (__glibc_unlikely ((l->l_faked | l->l_removed) != 0))
+ continue;
+ if (!_dl_name_match_p (name, l))
+ {
+ const char *soname;
+
+ if (__glibc_likely (l->l_soname_added)
+ || l->l_info[DT_SONAME] == NULL)
+ continue;
+
+ soname = ((const char *) D_PTR (l, l_info[DT_STRTAB])
+ + l->l_info[DT_SONAME]->d_un.d_val);
+ if (strcmp (name, soname) != 0)
+ continue;
+
+ /* We have a match on a new name -- cache it. */
+ add_name_to_object (l, soname);
+ l->l_soname_added = 1;
+ }
+
+ /* We have a match. */
+ return l;
+ }
+
+ return NULL;
+}
+
/* Map in the shared object file NAME. */
struct link_map *
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index ea3f7a69d0..08791fbc0f 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -1241,6 +1241,10 @@ extern void _dl_show_scope (struct link_map *new, int from)
extern struct link_map *_dl_find_dso_for_object (const ElfW(Addr) addr);
rtld_hidden_proto (_dl_find_dso_for_object)
+extern struct link_map *_dl_find_dso (const char *name, Lmid_t nsid);
+rtld_hidden_proto (_dl_find_dso)
+
+
/* Initialization which is normally done by the dynamic linker. */
extern void _dl_non_dynamic_init (void)
attribute_hidden;
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [RFC][PATCH v10 3/7] Use the new DSO finder helper function
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 1/7] Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745) Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 2/7] Abstract loaded-DSO search code into a helper function Vivek Das Mohapatra
@ 2021-03-22 15:41 ` Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745) Vivek Das Mohapatra
` (5 subsequent siblings)
8 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
---
elf/dl-load.c | 28 +++-------------------------
1 file changed, 3 insertions(+), 25 deletions(-)
diff --git a/elf/dl-load.c b/elf/dl-load.c
index 3ffb83cb6a..f2dbe45703 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -2062,32 +2062,10 @@ _dl_map_object (struct link_map *loader, const char *name,
assert (nsid < GL(dl_nns));
/* Look for this name among those already loaded. */
- for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
+ l = _dl_find_dso (name, nsid);
+
+ if (l != NULL)
{
- /* If the requested name matches the soname of a loaded object,
- use that object. Elide this check for names that have not
- yet been opened. */
- if (__glibc_unlikely ((l->l_faked | l->l_removed) != 0))
- continue;
- if (!_dl_name_match_p (name, l))
- {
- const char *soname;
-
- if (__glibc_likely (l->l_soname_added)
- || l->l_info[DT_SONAME] == NULL)
- continue;
-
- soname = ((const char *) D_PTR (l, l_info[DT_STRTAB])
- + l->l_info[DT_SONAME]->d_un.d_val);
- if (strcmp (name, soname) != 0)
- continue;
-
- /* We have a match on a new name -- cache it. */
- add_name_to_object (l, soname);
- l->l_soname_added = 1;
- }
-
- /* We have a match. */
return l;
}
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745)
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
` (2 preceding siblings ...)
2021-03-22 15:41 ` [RFC][PATCH v10 3/7] Use the new DSO finder " Vivek Das Mohapatra
@ 2021-03-22 15:41 ` Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag " Vivek Das Mohapatra
` (4 subsequent siblings)
8 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
libc.so, libpthread.so etc should have the new unique-dso-by-default
flag set to allow dlmopen to work better (libc et al instance shared
by default when DSOs dlmopened into a new namespace).
---
Makeconfig | 3 +++
Makerules | 19 +++++++++++++-
config.make.in | 1 +
configure | 54 ++++++++++++++++++++++++++++++++++++---
configure.ac | 32 +++++++++++++++++++++--
dynamic-notes.c | 4 +++
elf/Makefile | 3 +++
| 3 +++
htl/Makefile | 3 +++
iconvdata/Makefile | 3 +++
| 4 +++
nptl/Makefile | 3 +++
12 files changed, 126 insertions(+), 6 deletions(-)
create mode 100644 dynamic-notes.c
diff --git a/Makeconfig b/Makeconfig
index 01f8638c2e..7e1116163f 100644
--- a/Makeconfig
+++ b/Makeconfig
@@ -398,6 +398,9 @@ LDFLAGS-lib.so += -Wl,-z,now
# Extra flags for dynamically linked non-test main programs.
link-extra-flags += -Wl,-z,now
endif
+ifeq ($(ld-zunique),yes)
+LDFLAGS-lib.so += -Wl,-z,unique
+endif
# Command to run after every final link (executable or shared object).
# This is invoked with $(call after-link,...), so it should operate on
diff --git a/Makerules b/Makerules
index ca9885436e..d54767f3a6 100644
--- a/Makerules
+++ b/Makerules
@@ -581,7 +581,8 @@ $(common-objpfx)shlib.lds: $(common-objpfx)config.make $(..)Makerules
PROVIDE(__start___libc_IO_vtables = .);\
__libc_IO_vtables : { *(__libc_IO_vtables) }\
PROVIDE(__stop___libc_IO_vtables = .);\
- /DISCARD/ : { *(.gnu.glibc-stub.*) }@'
+ /DISCARD/ : { *(.gnu.glibc-stub.*) }@' \
+ -e 's/^.*\*(\.dynamic).*$$/ .dynamic : { *dynamic-notes.os(.dynamic) *(.dynamic) }/'
test -s $@T
mv -f $@T $@
common-generated += shlib.lds
@@ -636,6 +637,17 @@ build-shlib-objlist = $(build-module-helper-objlist) \
# Also omits crti.o and crtn.o, which we do not want
# since we define our own `.init' section specially.
LDFLAGS-c.so = -nostdlib -nostartfiles
+
+# The stub dynamic-notes.os should not have weak/undefined symbol magic in it.
+# It's not really part of the internals, rather it is a vector for linker magic
+# which we need when the linker isn't new enough:
+%/dynamic-notes.os: CPPFLAGS += -UMODULE_NAME
+%/dynamic-notes.os: dynamic-notes.c
+
+ifeq ($(ld-zunique),yes)
+LDFLAGS-c.so += -Wl,-z,unique
+endif
+
# But we still want to link libc.so against $(libc.so-gnulib).
LDLIBS-c.so += $(libc.so-gnulib)
# Give libc.so an entry point and make it directly runnable itself.
@@ -706,6 +718,11 @@ $(common-objpfx)linkobj/libc.so: $(common-objpfx)linkobj/libc_pic.a \
$(build-shlib)
$(call after-link,$@)
+ifneq ($(ld-zunique),yes)
+$(common-objpfx)libc.so: $(common-objpfx)dynamic-notes.os
+$(common-objpfx)linkobj/libc.so: $(common-objpfx)dynamic-notes.os
+endif
+
ifeq ($(build-shared),yes)
$(common-objpfx)libc.so: $(common-objpfx)libc.map
endif
diff --git a/config.make.in b/config.make.in
index 7f47f0caa4..c2d818681b 100644
--- a/config.make.in
+++ b/config.make.in
@@ -72,6 +72,7 @@ have-cc-with-libunwind = @libc_cv_cc_with_libunwind@
fno-unit-at-a-time = @fno_unit_at_a_time@
bind-now = @bindnow@
have-hash-style = @libc_cv_hashstyle@
+ld-zunique = @ld_zunique@
use-default-link = @use_default_link@
have-cxx-thread_local = @libc_cv_cxx_thread_local@
have-loop-to-function = @libc_cv_cc_loop_to_function@
diff --git a/configure b/configure
index 37cef37413..1040130d6c 100755
--- a/configure
+++ b/configure
@@ -685,6 +685,7 @@ hardcoded_path_in_tests
enable_timezone_tools
extra_nonshared_cflags
use_default_link
+ld_zunique
sysheaders
ac_ct_CXX
CXXFLAGS
@@ -731,6 +732,7 @@ infodir
docdir
oldincludedir
includedir
+runstatedir
localstatedir
sharedstatedir
sysconfdir
@@ -843,6 +845,7 @@ datadir='${datarootdir}'
sysconfdir='${prefix}/etc'
sharedstatedir='${prefix}/com'
localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
includedir='${prefix}/include'
oldincludedir='/usr/include'
docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1095,6 +1098,15 @@ do
| -silent | --silent | --silen | --sile | --sil)
silent=yes ;;
+ -runstatedir | --runstatedir | --runstatedi | --runstated \
+ | --runstate | --runstat | --runsta | --runst | --runs \
+ | --run | --ru | --r)
+ ac_prev=runstatedir ;;
+ -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+ | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+ | --run=* | --ru=* | --r=*)
+ runstatedir=$ac_optarg ;;
+
-sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
ac_prev=sbindir ;;
-sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1232,7 +1244,7 @@ fi
for ac_var in exec_prefix prefix bindir sbindir libexecdir datarootdir \
datadir sysconfdir sharedstatedir localstatedir includedir \
oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
- libdir localedir mandir
+ libdir localedir mandir runstatedir
do
eval ac_val=\$$ac_var
# Remove trailing slashes.
@@ -1385,6 +1397,7 @@ Fine tuning of the installation directories:
--sysconfdir=DIR read-only single-machine data [PREFIX/etc]
--sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
--localstatedir=DIR modifiable single-machine data [PREFIX/var]
+ --runstatedir=DIR modifiable per-process data [LOCALSTATEDIR/run]
--libdir=DIR object code libraries [EPREFIX/lib]
--includedir=DIR C header files [PREFIX/include]
--oldincludedir=DIR C header files for non-gcc [/usr/include]
@@ -3331,6 +3344,7 @@ fi
+
# Check whether --with-default-link was given.
if test "${with_default_link+set}" = set; then :
withval=$with_default_link; use_default_link=$withval
@@ -5976,6 +5990,34 @@ fi
$as_echo "$libc_cv_hashstyle" >&6; }
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker DT_GNU_FLAGS_1/ DF_GNU_1_UNIQUE support" >&5
+$as_echo_n "checking for linker DT_GNU_FLAGS_1/ DF_GNU_1_UNIQUE support... " >&6; }
+if ${libc_cv_ld_zunique+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ cat > conftest.ld.c <<\EOF
+int x (void) { return 0; }
+EOF
+libc_cv_ld_zunique=no;
+if { ac_try='${CC-cc} -Wl,--fatal-warnings -Wl,-z,unique -shared -o conftest.ld.so conftest.ld.c'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+then
+ libc_cv_ld_zunique=yes
+else
+ echo >&5 "\
+${CC-cc} does not support -Wl,-z,unique from:
+$ac_try"
+fi;
+ld_zunique=$libc_cv_ld_zunique
+rm -f conftest*
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_zunique" >&5
+$as_echo "$libc_cv_ld_zunique" >&6; }
+
# The linker's default -shared behavior is good enough if it
# does these things that our custom linker scripts ensure that
# all allocated NOTE sections come first.
@@ -6021,10 +6063,16 @@ EOF
esac
shift 2
done
- case "$libc_seen_a$libc_seen_b" in
- yesyes)
+ case "$libc_seen_a$libc_seen_b$libc_cv_ld_zunique" in
+ yesyesyes)
libc_cv_use_default_link=yes
;;
+ yesyesno)
+ echo >&5 "\
+shared layout from:
+$ac_try
+is OK but -Wl,-z,unique is unsupported anyway"
+ ;;
*)
echo >&5 "\
$libc_seen_a$libc_seen_b from:
diff --git a/configure.ac b/configure.ac
index 16b15b6f90..178874aa12 100644
--- a/configure.ac
+++ b/configure.ac
@@ -148,6 +148,7 @@ AC_ARG_WITH([headers],
[sysheaders=''])
AC_SUBST(sysheaders)
+AC_SUBST(ld_zunique)
AC_SUBST(use_default_link)
AC_ARG_WITH([default-link],
AS_HELP_STRING([--with-default-link],
@@ -1352,6 +1353,27 @@ fi
rm -f conftest*])
AC_SUBST(libc_cv_hashstyle)
+AC_CACHE_CHECK([for linker DT_GNU_FLAGS_1/ DF_GNU_1_UNIQUE support],
+ libc_cv_ld_zunique, [dnl
+cat > conftest.ld.c <<\EOF
+int x (void) { return 0; }
+EOF
+libc_cv_ld_zunique=no;
+dnl FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
+dnl THIS IS DELIBERATELY WRONG SO WE CAN TEST BUILDING WITH A TOO-OLD LINKER
+dnl FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
+if AC_TRY_COMMAND([dnl
+${CC-cc} -Wl,--fatal-warnings -Wl,-z,unique -shared -o conftest.ld.so conftest.ld.c])
+then
+ libc_cv_ld_zunique=yes
+else
+ echo >&AS_MESSAGE_LOG_FD "\
+${CC-cc} does not support -Wl,-z,unique from:
+$ac_try"
+fi;
+ld_zunique=$libc_cv_ld_zunique
+rm -f conftest*])
+
# The linker's default -shared behavior is good enough if it
# does these things that our custom linker scripts ensure that
# all allocated NOTE sections come first.
@@ -1390,10 +1412,16 @@ EOF
esac
shift 2
done
- case "$libc_seen_a$libc_seen_b" in
- yesyes)
+ case "$libc_seen_a$libc_seen_b$libc_cv_ld_zunique" in
+ yesyesyes)
libc_cv_use_default_link=yes
;;
+ yesyesno)
+ echo >&AS_MESSAGE_LOG_FD "\
+shared layout from:
+$ac_try
+is OK but -Wl,-z,unique is unsupported anyway"
+ ;;
*)
echo >&AS_MESSAGE_LOG_FD "\
$libc_seen_a$libc_seen_b from:
diff --git a/dynamic-notes.c b/dynamic-notes.c
new file mode 100644
index 0000000000..d0b487e970
--- /dev/null
+++ b/dynamic-notes.c
@@ -0,0 +1,4 @@
+#include <link.h>
+
+const ElfW(Dyn) __dynamic_note __attribute__ ((section (".dynamic"))) =
+ { .d_tag = DT_GNU_FLAGS_1, .d_un.d_val = DF_GNU_1_UNIQUE };
diff --git a/elf/Makefile b/elf/Makefile
index 3b8e13e066..22f2a87fcb 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -102,6 +102,9 @@ endif
ifeq (yes,$(build-shared))
extra-objs = $(all-rtld-routines:%=%.os) sofini.os interp.os
+ifneq (yes,$(ld-zunique))
+extra-objs += ../dynamic-notes.os
+endif
generated += librtld.os dl-allobjs.os ld.so ldd
install-others = $(inst_rtlddir)/$(rtld-installed-name)
install-bin-script = ldd
--git a/extra-lib.mk b/extra-lib.mk
index 72f8d2e1df..4e4a447d5e 100644
--- a/extra-lib.mk
+++ b/extra-lib.mk
@@ -101,6 +101,9 @@ $(objpfx)$(lib).so: $(firstword $($(lib)-map) \
$(addprefix $(common-objpfx), \
$(filter $(lib).map, \
$(version-maps))))
+ifneq ($(ld-zunique),yes)
+$(objpfx)$(lib).so: $(common-objpfx)dynamic-notes.os
+endif
endif
endif
diff --git a/htl/Makefile b/htl/Makefile
index 895a6f777c..65ddd202a1 100644
--- a/htl/Makefile
+++ b/htl/Makefile
@@ -205,6 +205,9 @@ libc-link.so = $(common-objpfx)libc.so
extra-B-pthread.so = -B$(common-objpfx)htl/
LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst
+ifeq ($(ld-zunique),yes)
+LDFLAGS-pthread.so += -Wl,-z,unique
+endif
include ../Rules
diff --git a/iconvdata/Makefile b/iconvdata/Makefile
index 55c527a5f7..2fe2404ade 100644
--- a/iconvdata/Makefile
+++ b/iconvdata/Makefile
@@ -67,6 +67,9 @@ modules := ISO8859-1 ISO8859-2 ISO8859-3 ISO8859-4 ISO8859-5 \
ifeq ($(bind-now),yes)
LDFLAGS.so += -Wl,-z,now
endif
+ifeq ($(ld-zunique),yes)
+LDFLAGS.so += -Wl,-z,unique
+endif
modules.so := $(addsuffix .so, $(modules))
--git a/iconvdata/extra-module.mk b/iconvdata/extra-module.mk
index ecaf507624..4d81358f19 100644
--- a/iconvdata/extra-module.mk
+++ b/iconvdata/extra-module.mk
@@ -7,6 +7,10 @@ $(objpfx)$(mod).so: $(addprefix $(objpfx),$(addsuffix .os,$($(mod)-routines)))\
$(shlib-lds) $(link-libc-deps)
$(build-module-asneeded)
+ifneq ($(ld-zunique),yes)
+$(objpfx)$(mod).so: $(common-objpfx)dynamic-notes.os
+endif
+
ifneq (,$(extra-modules-left))
include extra-module.mk
endif
diff --git a/nptl/Makefile b/nptl/Makefile
index b1948cc47a..dedfe389c0 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -396,6 +396,9 @@ tests-printers-libs := $(static-thread-library)
endif
LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst
+ifeq ($(ld-zunique),yes)
+LDFLAGS-pthread.so += -Wl,-z,unique
+endif
tests += tst-cancelx7 tst-cancelx17 tst-cleanupx4
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag (bug 22745)
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
` (3 preceding siblings ...)
2021-03-22 15:41 ` [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745) Vivek Das Mohapatra
@ 2021-03-22 15:41 ` Vivek Das Mohapatra
2021-05-28 17:32 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 6/7] Add dlmopen / RTLD_SHARED tests Vivek Das Mohapatra
` (3 subsequent siblings)
8 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
This flag will instruct dlmopen to create a shared object present
in the main namespace and accessible from the selected namespace
when supplied in the MODE argument.
include/link.h: Update the link_map struct to allow proxies
We already have an l_real pointer, used for a similar purpose by
the linker for copies of ld.so in secondary namespaces. Update its
documentation and add a bitfield to indicate when link_map entry
is a proxy.
elf/dl-object.c: Implement a helper function to proxy link_map entries
Provides the minimal functionality needed to take an existing
link_map entry and create a proxy for it in the specified namespace.
elf/dl-load.c, elf/dl-open.c: Implement RTLD_SHARED dlmopen proxying
This uses the new infrastructure to implement RTLD_SHARED object
proxying via dlmopen: Instead of opening the specified object in
the requested namespace we open it in the main namespace (if it
is not already present there) and proxy it to the destination.
The following rules apply:
If a proxy of the object is already present in the requested namespace,
we simply return it (with an incremented direct-open count).
If the object is already present in the requested namespace, a dl
error is signalled, since we cannot satisfy the user's request.
Proxies are never created in the main namespace: RTLD_SHARED has no
effect when the requested namespace is LM_ID_BASE.
elf/dl-fini.c: Handle proxy link_maps in the shutdown path (bug 22745)
When cleaning up before exit we should not call destructors or
otherwise free [most of] the contents of proxied link_map entries
since they share [most of] their contents with the LM_ID_BASE
objects to which they point.
elf/dl-init.c: Skip proxy link_map entries in dl init path
Proxies should not trigger calls to DT_INIT constructors since they're
just shims that point to the real, already loaded and initialised, objects.
elf/dl-open.c: Skip libc init if namespace has no libc map
Secondary namespaces which share their libc mapping with the main
namespace cannot (and should not) have _dl_call_libc_early_init
called for them by dl_open_worker.
elf/dl-open.c: When creating a proxy check NS 0 libc map
The libc_already_loaded check normally considers the libc_map entry
in GL(dl_ns)[args->nsid].libc_map.
This is not correct for proxies, which use the libc_map from
the default namespace (as proxies are dummy entries that point
to the base namespace via their l_real members).
elf/dl-load.c, dl-open.c: Compare DSOs by file ID & check DF_GNU_1_UNIQUE
If _dl_map_object_from_fd finds that a DSO it was asked to
load into a non-base namespace is already loaded (into the
main namespace) and is flagged DF_GNU_1_UNIQUE then it should
return that DSO's link map entry.
In such cases _dl_open_worker must notice that this has
happened and continue down the link map proxy generation
path instead of normal link map entry preparation.
elf/dl-load.c: error if RTLD_SHARED = DF_GNU_1_UNIQUE semantics violated
elf/dl-open.c: Use search helper to find preloaded DT_GNU_UNIQUE DSOs
If a DSO already exists (with the same name) in the base namespace
and it is flagged DT_GNU_UNIQUE then we should behave as if a proxy
had been requested.
elf/dl-load.c: When loading DSOs in other namespaces check DT_GNU_UNIQUE
If a DSO has not already been loaded and the target is not the main
namespace then we must check to see if it's been DT_GNU_UNIQUE tagged
and load it into the main namespace instead.
dl_open_worker has alread been modified to notice the discrepancy
between the request and the result in such cases, and will set up
a proxy in the target namespace.
elf/dl-load.c: Suppress audit calls when a (new) namespace is empty
When preparing an RTLD_SHARED proxy in a new namespace
it is possible for the target namespace to be empty:
This can happen for RTLD_SHARED + LM_ID_NEWLM.
The audit infrastructure should not be invoked at this
point (as there's nothing there to audit yet).
bits/dlfcn.h, elf/dl-load.c, elf/dl-open.c, elf/rtld.c,
sysdeps/mips/bits/dlfcn.h:
Suppress inter-namespace DSO sharing for audit libraries
Audit libraries should not participate in DSO sharing: In
particular libraries tagged with DF_GNU_1_UNIQUE should not
be shared between the audit namespace and any others - they
should get their own copy.
This is signalled to the loader code by passing the RTLD_ISOLATE
flag from the relevant entry point in the dl modes argument.
elf/dl-sym.c: dlsym, dlvsym must be able to resolve symbols via proxies
---
bits/dlfcn.h | 10 ++
elf/dl-close.c | 43 +++++----
elf/dl-fini.c | 6 +-
elf/dl-init.c | 4 +-
elf/dl-load.c | 181 +++++++++++++++++++++++++++++++++----
elf/dl-object.c | 78 ++++++++++++++++
elf/dl-open.c | 109 +++++++++++++++++++++-
elf/dl-sym.c | 14 +++
elf/rtld.c | 2 +-
include/link.h | 6 +-
sysdeps/generic/ldsodefs.h | 5 +
sysdeps/mips/bits/dlfcn.h | 10 ++
12 files changed, 423 insertions(+), 45 deletions(-)
diff --git a/bits/dlfcn.h b/bits/dlfcn.h
index f3bc63e958..1366cb3546 100644
--- a/bits/dlfcn.h
+++ b/bits/dlfcn.h
@@ -32,6 +32,16 @@
visible as if the object were linked directly into the program. */
#define RTLD_GLOBAL 0x00100
+/* If the following bit is set in the MODE argument to dlmopen
+ then the target object is loaded into the main namespace (if
+ it is not already there) and a shallow copy (proxy) is placed
+ in the target namespace: This allows multiple namespaces to
+ share a single instance of a DSO. */
+#define RTLD_SHARED 0x00080
+
+/* Suppress RTLD_SHARED and/or DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE */
+#define RTLD_ISOLATE 0x00040
+
/* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
The implementation does this by default and so we can define the
value to zero. */
diff --git a/elf/dl-close.c b/elf/dl-close.c
index c51becd06b..a0432b884d 100644
--- a/elf/dl-close.c
+++ b/elf/dl-close.c
@@ -283,8 +283,9 @@ _dl_close_worker (struct link_map *map, bool force)
/* Call its termination function. Do not do it for
half-cooked objects. Temporarily disable exception
- handling, so that errors are fatal. */
- if (imap->l_init_called)
+ handling, so that errors are fatal.
+ Proxies should never have this flag set, but we double check. */
+ if (imap->l_init_called && !imap->l_proxy)
{
/* When debugging print a message first. */
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS,
@@ -360,7 +361,9 @@ _dl_close_worker (struct link_map *map, bool force)
one for the terminating NULL pointer. */
size_t remain = (new_list != NULL) + 1;
bool removed_any = false;
- for (size_t cnt = 0; imap->l_scope[cnt] != NULL; ++cnt)
+ for (size_t cnt = 0;
+ imap->l_scope && imap->l_scope[cnt] != NULL;
+ ++cnt)
/* This relies on l_scope[] entries being always set either
to its own l_symbolic_searchlist address, or some map's
l_searchlist address. */
@@ -686,8 +689,10 @@ _dl_close_worker (struct link_map *map, bool force)
/* We can unmap all the maps at once. We determined the
start address and length when we loaded the object and
- the `munmap' call does the rest. */
- DL_UNMAP (imap);
+ the `munmap' call does the rest. Proxies do not have
+ any segments of their own to unmap. */
+ if (!imap->l_proxy)
+ DL_UNMAP (imap);
/* Finally, unlink the data structure and free it. */
#if DL_NNS == 1
@@ -727,19 +732,23 @@ _dl_close_worker (struct link_map *map, bool force)
_dl_debug_printf ("\nfile=%s [%lu]; destroying link map\n",
imap->l_name, imap->l_ns);
- /* This name always is allocated. */
- free (imap->l_name);
- /* Remove the list with all the names of the shared object. */
+ /* Skip structures borrowed by proxies from the real map. */
+ if (!imap->l_proxy)
+ {
+ /* This name always is allocated. */
+ free (imap->l_name);
+ /* Remove the list with all the names of the shared object. */
- struct libname_list *lnp = imap->l_libname;
- do
- {
- struct libname_list *this = lnp;
- lnp = lnp->next;
- if (!this->dont_free)
- free (this);
- }
- while (lnp != NULL);
+ struct libname_list *lnp = imap->l_libname;
+ do
+ {
+ struct libname_list *this = lnp;
+ lnp = lnp->next;
+ if (!this->dont_free)
+ free (this);
+ }
+ while (lnp != NULL);
+ }
/* Remove the searchlists. */
free (imap->l_initfini);
diff --git a/elf/dl-fini.c b/elf/dl-fini.c
index 6dbdfe4b3e..10194488bb 100644
--- a/elf/dl-fini.c
+++ b/elf/dl-fini.c
@@ -73,7 +73,7 @@ _dl_fini (void)
assert (nloaded != 0 || GL(dl_ns)[ns]._ns_loaded == NULL);
for (l = GL(dl_ns)[ns]._ns_loaded, i = 0; l != NULL; l = l->l_next)
/* Do not handle ld.so in secondary namespaces. */
- if (l == l->l_real)
+ if (l == l->l_real || l->l_proxy)
{
assert (i < nloaded);
@@ -111,7 +111,9 @@ _dl_fini (void)
{
struct link_map *l = maps[i];
- if (l->l_init_called)
+ /* Do not call fini functions via proxies, or for
+ objects which are not marked as initialised. */
+ if (l->l_init_called && !l->l_proxy)
{
/* Make sure nothing happens if we are called twice. */
l->l_init_called = 0;
diff --git a/elf/dl-init.c b/elf/dl-init.c
index f924d26642..00ce8bb9d6 100644
--- a/elf/dl-init.c
+++ b/elf/dl-init.c
@@ -30,8 +30,8 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
need relocation, and neither do proxy objects.) */
assert (l->l_real->l_relocated || l->l_real->l_type == lt_executable);
- if (l->l_init_called)
- /* This object is all done. */
+ if (l->l_init_called || l->l_proxy)
+ /* This object is all done, or a proxy (and therefore initless). */
return;
/* Avoid handling this constructor again in case we have a circular
diff --git a/elf/dl-load.c b/elf/dl-load.c
index f2dbe45703..11513e1992 100644
--- a/elf/dl-load.c
+++ b/elf/dl-load.c
@@ -838,6 +838,53 @@ _dl_init_paths (const char *llp, const char *source,
__rtld_env_path_list.dirs = (void *) -1;
}
+static bool
+has_gnu_unique (int fd, const ElfW(Ehdr) *header, const ElfW(Phdr) *phdr)
+{
+ bool unique = false;
+ const ElfW(Phdr) *ph;
+
+ for (ph = phdr; ph < &phdr[header->e_phnum]; ++ph)
+ {
+ off64_t end;
+ off64_t pos;
+ ssize_t bytes = -1;
+ ElfW(Dyn) entry = { .d_tag = 0, .d_un.d_val = 0 };
+
+ switch (ph->p_type)
+ {
+ case PT_DYNAMIC:
+ pos = ph->p_offset;
+ end = pos + ph->p_filesz;
+
+ while (pos < end)
+ {
+ bytes = __pread64_nocancel (fd, &entry, sizeof (ElfW(Dyn)), pos);
+
+ if (__glibc_unlikely (bytes != sizeof (ElfW(Dyn))))
+ goto done;
+
+ pos += bytes;
+
+ switch (entry.d_tag)
+ {
+ case DT_GNU_FLAGS_1:
+ unique = (entry.d_un.d_val & DF_GNU_1_UNIQUE);
+ goto done;
+ break;
+
+ case DT_NULL:
+ goto done;
+ break;
+ }
+ }
+ break;
+ }
+ }
+
+ done:
+ return unique;
+}
/* Process PT_GNU_PROPERTY program header PH in module L after
PT_LOAD segments are mapped. Only one NT_GNU_PROPERTY_TYPE_0
@@ -1021,6 +1068,32 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
}
#endif
+ /* DSOs in the main namespace which are flagged DF_GNU_1_UNIQUE should only
+ be opened into the main namespace. Other namespaces should only get
+ proxies. */
+ if (__glibc_unlikely ((nsid != LM_ID_BASE) && !(mode & RTLD_ISOLATE)))
+ {
+ /* Check base ns to see if the name matched another already loaded. */
+ for (l = GL(dl_ns)[LM_ID_BASE]._ns_loaded; l != NULL; l = l->l_next)
+ if (!l->l_removed && _dl_file_id_match_p (&l->l_file_id, &id))
+ {
+ if (!(l->l_gnu_flags_1 & DF_GNU_1_UNIQUE))
+ continue;
+
+ /* Already loaded. Bump its reference count and return it. */
+ __close_nocancel (fd);
+
+ /* If the name is not listed for this object add it. */
+ free (realname);
+ add_name_to_object (l, name);
+
+ /* NOTE: It is important that our caller picks up on the fact
+ that we have NOT returned an object in the requested namespace
+ and handles the proxying correctly. */
+ return l;
+ }
+ }
+
if (mode & RTLD_NOLOAD)
{
/* We are not supposed to load the object unless it is already
@@ -1046,8 +1119,11 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
&& __glibc_unlikely (GLRO(dl_naudit) > 0))
{
struct link_map *head = GL(dl_ns)[nsid]._ns_loaded;
- /* Do not call the functions for any auditing object. */
- if (head->l_auditing == 0)
+ /* Do not call the functions for any auditing object.
+ Do not try to call auditing functions if the namespace
+ is currently empty. This can hapen when opening the first
+ DSO in a new namespace. */
+ if ((head != NULL) && (head->l_auditing == 0))
{
struct audit_ifaces *afct = GLRO(dl_audit);
for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
@@ -1073,6 +1149,32 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
else
assert (r->r_state == RT_ADD);
+ /* Load the ELF header using preallocated struct space if it's big enough. */
+ maplength = header->e_phnum * sizeof (ElfW(Phdr));
+ if (header->e_phoff + maplength <= (size_t) fbp->len)
+ phdr = (void *) (fbp->buf + header->e_phoff);
+ else
+ {
+ phdr = alloca (maplength);
+ if ((size_t) __pread64_nocancel (fd, (void *) phdr, maplength,
+ header->e_phoff) != maplength)
+ {
+ errstring = N_("cannot read file data");
+ goto lose_errno;
+ }
+ }
+
+ /* We need to check for DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE before we start
+ initialising any namespace dependent metatada. */
+ if (__glibc_unlikely ((nsid != LM_ID_BASE) && !(mode & RTLD_ISOLATE)))
+ {
+ /* Target DSO is flagged as unique: Make sure it gets loaded into
+ the base namespace. It is up to our caller to generate a proxy
+ in the target nsid. */
+ if (has_gnu_unique (fd, header, phdr))
+ nsid = LM_ID_BASE;
+ }
+
/* Enter the new object in the list of loaded objects. */
l = _dl_new_object (realname, name, l_type, loader, mode, nsid);
if (__glibc_unlikely (l == NULL))
@@ -1090,20 +1192,6 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
type = header->e_type;
l->l_phnum = header->e_phnum;
- maplength = header->e_phnum * sizeof (ElfW(Phdr));
- if (header->e_phoff + maplength <= (size_t) fbp->len)
- phdr = (void *) (fbp->buf + header->e_phoff);
- else
- {
- phdr = alloca (maplength);
- if ((size_t) __pread64_nocancel (fd, (void *) phdr, maplength,
- header->e_phoff) != maplength)
- {
- errstring = N_("cannot read file data");
- goto lose_errno;
- }
- }
-
/* On most platforms presume that PT_GNU_STACK is absent and the stack is
* executable. Other platforms default to a nonexecutable stack and don't
* need PT_GNU_STACK to do so. */
@@ -2007,6 +2095,37 @@ open_path (const char *name, size_t namelen, int mode,
return -1;
}
+/* Search for a link map proxy in the given namespace by name.
+ Consider it to be an error if the found object is not a proxy. */
+struct link_map *
+_dl_find_proxy (Lmid_t nsid, const char *name)
+{
+ struct link_map *l;
+
+ for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
+ {
+ if (__glibc_unlikely ((l->l_faked | l->l_removed) != 0))
+ continue;
+
+ if (!_dl_name_match_p (name, l))
+ continue;
+
+ /* We have a match - stop searching. */
+ break;
+ }
+
+ if (l != NULL)
+ {
+ if (l->l_proxy)
+ return l;
+
+ _dl_signal_error (EEXIST, name, NULL,
+ N_("object cannot be demoted to a proxy"));
+ }
+
+ return NULL;
+}
+
/* Search for a shared object in a given namespace. */
struct link_map *
_dl_find_dso (const char *name, Lmid_t nsid)
@@ -2060,12 +2179,42 @@ _dl_map_object (struct link_map *loader, const char *name,
assert (nsid >= 0);
assert (nsid < GL(dl_nns));
+ assert (!((mode & RTLD_ISOLATE) && (mode & RTLD_SHARED)));
+
+#ifdef SHARED
+ /* Only need to do proxy checks if 'nsid' is not LM_ID_BASE. */
+ if (__glibc_unlikely ((mode & RTLD_SHARED) && (nsid != LM_ID_BASE)))
+ {
+ /* Search the namespace in case the object is already proxied. */
+ l = _dl_find_proxy (nsid, name);
+ if (l != NULL)
+ return l;
+
+ /* Further searches should be in the base ns: We will proxy the
+ resulting object in dl_open_worker *after* it is initialised. */
+ nsid = LM_ID_BASE;
+ }
+#endif
/* Look for this name among those already loaded. */
l = _dl_find_dso (name, nsid);
if (l != NULL)
{
+#ifdef SHARED
+ /* If we are trying to load a DF_GNU_1_UNIQUE flagged DSO which WAS
+ already opened in the target NS but with RTLD_ISOLATE so it WAS NOT
+ created as a proxy we need to error out since we cannot satisfy the
+ DF_GNU_1_UNIQUE is-equivalent-to RTLD_SHARED semantics. */
+ if (!(mode & RTLD_ISOLATE) &&
+ (l->l_ns != LM_ID_BASE) &&
+ (l->l_gnu_flags_1 & DF_GNU_1_UNIQUE) &&
+ !l->l_proxy)
+ {
+ _dl_signal_error (EEXIST, name, NULL,
+ N_("object cannot be demoted to a proxy"));
+ }
+#endif
return l;
}
diff --git a/elf/dl-object.c b/elf/dl-object.c
index 1875599eb2..30a05b086f 100644
--- a/elf/dl-object.c
+++ b/elf/dl-object.c
@@ -21,6 +21,7 @@
#include <stdlib.h>
#include <unistd.h>
#include <ldsodefs.h>
+#include <libintl.h>
#include <assert.h>
@@ -50,6 +51,83 @@ _dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid)
__rtld_lock_unlock_recursive (GL(dl_load_write_lock));
}
+/* Proxy an existing link map entry into a new link map:
+ This is based on _dl_new_object, skipping the steps we know we won't need
+ because this is mostly just a shell for the l_real pointer holding the real
+ link map entry (normally l == l->l_real, but not for ld.so in non-main
+ link maps or RTLD_SHARED proxies).
+ It also flags the proxy by setting l_proxy, and sets the the no-delete
+ flag in the original if it is an lt_loaded. */
+struct link_map *
+_dl_new_proxy (struct link_map *old, int mode, Lmid_t nsid)
+{
+ const char *name;
+ struct link_map *new;
+ struct libname_list *newname;
+#ifdef SHARED
+ unsigned int na = GLRO(dl_naudit);
+
+ if ((mode & __RTLD_OPENEXEC) != 0)
+ na = DL_NNS;
+
+ size_t audit_space = na * sizeof (struct auditstate);
+#else
+# define audit_space 0
+#endif
+
+ name = old->l_name;
+
+ /* Find the original link map entry if 'old' is itself a proxy. */
+ while (old != NULL && old->l_proxy)
+ old = old->l_real;
+
+ if (old == NULL)
+ _dl_signal_error (EINVAL, name, NULL, N_("cannot proxy NULL link_map"));
+
+ /* Object already exists in the target namespace. This should get handled
+ by dl_open_worker but just in case we get this far, handle it: */
+ if (__glibc_unlikely (old->l_ns == nsid))
+ _dl_signal_error (EEXIST, name, NULL,
+ N_("existing object cannot be demoted to a proxy"));
+
+ /* Now duplicate as little of _dl_new_object as possible to get a
+ working proxied object in the target link map. */
+ new = (struct link_map *) calloc (sizeof (*new) + audit_space
+ + sizeof (struct link_map *)
+ + sizeof (*newname) + PATH_MAX, 1);
+
+ if (new == NULL)
+ _dl_signal_error (ENOMEM, name, NULL,
+ N_("cannot create shared object descriptor"));
+
+ /* Specific to the proxy. */
+ new->l_real = old;
+ new->l_proxy = 1;
+ new->l_ns = nsid;
+
+ /* Copied from the origin. */
+ new->l_libname = old->l_libname;
+ new->l_name = old->l_name;
+ /* Proxies are considered lt_loaded if the real entry type is lt_library. */
+ new->l_type = (old->l_type == lt_library) ? lt_loaded : old->l_type;
+
+ if (__glibc_unlikely (mode & RTLD_NODELETE))
+ new->l_flags_1 |= DF_1_NODELETE;
+
+ /* Specific to the origin. Ideally we'd do some accounting here but
+ for now it's easier to pin the original so the proxy remains valid. */
+ if (old->l_type == lt_loaded)
+ old->l_flags_1 |= DF_1_NODELETE;
+
+ /* Fix up the searchlist so that relocations work. */
+ _dl_map_object_deps (new, NULL, 0, 0,
+ mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));
+
+ /* And finally put the proxy in the target namespace. */
+ _dl_add_to_namespace_list (new, nsid);
+
+ return new;
+}
/* Allocate a `struct link_map' for a new object being loaded,
and enter it into the _dl_loaded list. */
diff --git a/elf/dl-open.c b/elf/dl-open.c
index ab7aaa345e..083e6b2c3f 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -484,6 +484,16 @@ dl_open_worker (void *a)
const char *file = args->file;
int mode = args->mode;
struct link_map *call_map = NULL;
+ struct link_map *preloaded = NULL;
+ bool want_proxy = false;
+ bool dl_isolate = mode & RTLD_ISOLATE;
+ Lmid_t proxy_ns = LM_ID_BASE;
+
+ /* Isolation means we should suppress all inter-namespace sharing. */
+ if (dl_isolate)
+ mode &= ~RTLD_SHARED;
+ else
+ want_proxy = mode & RTLD_SHARED;
/* Determine the caller's map if necessary. This is needed in case
we have a DST, when we don't know the namespace ID we have to put
@@ -508,6 +518,15 @@ dl_open_worker (void *a)
args->nsid = call_map->l_ns;
}
+ /* Now that we know the NS for sure, sanity check the mode. */
+ if (__glibc_likely (args->nsid == LM_ID_BASE) &&
+ __glibc_unlikely (mode & RTLD_SHARED))
+ {
+ args->mode &= ~RTLD_SHARED;
+ mode &= ~RTLD_SHARED;
+ want_proxy = 0;
+ }
+
/* The namespace ID is now known. Keep track of whether libc.so was
already loaded, to determine whether it is necessary to call the
early initialization routine (or clear libc_map on error). */
@@ -521,6 +540,24 @@ dl_open_worker (void *a)
may not be true if this is a recursive call to dlopen. */
_dl_debug_initialize (0, args->nsid);
+ /* Target Lmid is not the base and we haven't explicitly asked for a proxy:
+ We need to check for a matching DSO in the base Lmid in case it is flagged
+ DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE in which case we add RTLD_SHARED to the
+ mode and set want_proxy.
+ NOTE: RTLD_ISOLATE in the mode suppresses this behaviour. */
+ if (__glibc_unlikely (args->nsid != LM_ID_BASE) &&
+ __glibc_likely (!dl_isolate) &&
+ __glibc_likely (!want_proxy))
+ {
+ preloaded = _dl_find_dso (file, LM_ID_BASE);
+
+ if ((preloaded != NULL) && (preloaded->l_gnu_flags_1 & DF_GNU_1_UNIQUE))
+ {
+ want_proxy = true;
+ mode |= RTLD_SHARED;
+ }
+ }
+
/* Load the named object. */
struct link_map *new;
args->map = new = _dl_map_object (call_map, file, lt_loaded, 0,
@@ -541,6 +578,35 @@ dl_open_worker (void *a)
/* This object is directly loaded. */
++new->l_direct_opencount;
+ /* Proxy already existed in the target ns, nothing left to do. */
+ if (__glibc_unlikely (new->l_proxy))
+ {
+ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
+ _dl_debug_printf ("proxied file=%s [%lu]; direct_opencount=%u\n\n",
+ new->l_name, new->l_ns, new->l_direct_opencount);
+ return;
+ }
+
+ /* If we are trying to load a DF_GNU_1_UNIQUE flagged DSO which was
+ NOT ALREADY LOADED (or not loaded with the name we are using) then
+ _dl_map_object will have returned an instance from the main namespace.
+ We need to detect this and set up the RTLD_SHARED flags. */
+ if (__glibc_unlikely (args->nsid != LM_ID_BASE && new->l_ns == LM_ID_BASE))
+ {
+ want_proxy = RTLD_SHARED;
+ mode |= RTLD_SHARED;
+ }
+
+ /* If we want proxy and we get this far then the entry in 'new' will
+ be in the main namespace: we should revert to the main namespace code
+ path(s), but remember the namespace we want the proxy to be in. */
+ if (__glibc_unlikely (want_proxy))
+ {
+ proxy_ns = args->nsid;
+ args->nsid = LM_ID_BASE;
+ args->libc_already_loaded = GL(dl_ns)[LM_ID_BASE].libc_map != NULL;
+ }
+
/* It was already open. */
if (__glibc_unlikely (new->l_searchlist.r_list != NULL))
{
@@ -572,6 +638,16 @@ dl_open_worker (void *a)
assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);
+ if (__glibc_unlikely (want_proxy))
+ {
+ args->map = new = _dl_new_proxy (new, mode, proxy_ns);
+ ++new->l_direct_opencount;
+
+ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
+ _dl_debug_printf ("proxying file=%s [%lu]; direct_opencount=%u\n\n",
+ new->l_name, new->l_ns, new->l_direct_opencount);
+ }
+
return;
}
@@ -582,7 +658,8 @@ dl_open_worker (void *a)
/* Load that object's dependencies. */
_dl_map_object_deps (new, NULL, 0, 0,
- mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));
+ mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT |
+ RTLD_ISOLATE));
/* So far, so good. Now check the versions. */
for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
@@ -753,16 +830,21 @@ dl_open_worker (void *a)
namespace. */
if (!args->libc_already_loaded)
{
+ /* If this is a secondary (nsid != LM_ID_BASE) namespace then
+ it is POSSIBLE there's no libc_map at all - We use the one
+ shared with LM_ID_BASE instead (which MUST already be
+ initialised for us to even reach here). */
struct link_map *libc_map = GL(dl_ns)[args->nsid].libc_map;
#ifdef SHARED
- bool initial = libc_map->l_ns == LM_ID_BASE;
+ bool initial = (libc_map != NULL) && (libc_map->l_real->l_ns == LM_ID_BASE);
#else
/* In the static case, there is only one namespace, but it
contains a secondary libc (the primary libc is statically
linked). */
bool initial = false;
#endif
- _dl_call_libc_early_init (libc_map, initial);
+ if (libc_map != NULL)
+ _dl_call_libc_early_init (libc_map, initial);
}
#ifndef SHARED
@@ -787,10 +869,27 @@ dl_open_worker (void *a)
if (mode & RTLD_GLOBAL)
add_to_global_update (new);
+ if (__glibc_unlikely (want_proxy))
+ {
+ /* args->map is the return slot which the caller sees, but keep
+ the original value of new hanging around so we can see the
+ real link map entry (for logging etc). */
+ args->map = _dl_new_proxy (new, mode, proxy_ns);
+ ++args->map->l_direct_opencount;
+ }
+
/* Let the user know about the opencount. */
if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
- _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
- new->l_name, new->l_ns, new->l_direct_opencount);
+ {
+ _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
+ new->l_name, new->l_ns, new->l_direct_opencount);
+
+ if (args->map->l_proxy)
+ _dl_debug_printf ("proxying file=%s [%lu]; direct_opencount=%u\n\n",
+ args->map->l_name,
+ args->map->l_ns,
+ args->map->l_direct_opencount);
+ }
}
void *
diff --git a/elf/dl-sym.c b/elf/dl-sym.c
index dfd6169e12..b7252804ad 100644
--- a/elf/dl-sym.c
+++ b/elf/dl-sym.c
@@ -96,6 +96,10 @@ do_sym (void *handle, const char *name, void *who,
{
match = _dl_sym_find_caller_link_map (caller);
+ /* Proxies don't contain any symbols: Need to look at the real DSO. */
+ if (__glibc_unlikely (match->l_proxy))
+ match = match->l_real;
+
/* Search the global scope. We have the simple case where
we look up in the scope of an object which was part of
the initial binary. And then the more complex part
@@ -140,6 +144,11 @@ RTLD_NEXT used in code not dynamically loaded"));
}
struct link_map *l = match;
+
+ /* Proxies don't contain any symbols: Need to look at the real DSO. */
+ if (__glibc_unlikely (l->l_proxy))
+ l = l->l_real;
+
while (l->l_loader != NULL)
l = l->l_loader;
@@ -150,6 +159,11 @@ RTLD_NEXT used in code not dynamically loaded"));
{
/* Search the scope of the given object. */
struct link_map *map = handle;
+
+ /* Proxies don't contain any symbols: Need to look at the real DSO. */
+ if (__glibc_unlikely (map->l_proxy))
+ map = map->l_real;
+
result = GLRO(dl_lookup_symbol_x) (name, map, &ref, map->l_local_scope,
vers, 0, flags, NULL);
}
diff --git a/elf/rtld.c b/elf/rtld.c
index 94a00e2049..e02ae18c1d 100644
--- a/elf/rtld.c
+++ b/elf/rtld.c
@@ -660,7 +660,7 @@ dlmopen_doit (void *a)
struct dlmopen_args *args = (struct dlmopen_args *) a;
args->map = _dl_open (args->fname,
(RTLD_LAZY | __RTLD_DLOPEN | __RTLD_AUDIT
- | __RTLD_SECURE),
+ | __RTLD_SECURE | RTLD_ISOLATE),
dl_main, LM_ID_NEWLM, _dl_argc, _dl_argv,
__environ);
}
diff --git a/include/link.h b/include/link.h
index 6ed35eb808..55e0cad71d 100644
--- a/include/link.h
+++ b/include/link.h
@@ -107,8 +107,9 @@ struct link_map
They may change without notice. */
/* This is an element which is only ever different from a pointer to
- the very same copy of this type for ld.so when it is used in more
- than one namespace. */
+ the very same copy of this type when:
+ - A shallow copy of ld.so is placed in namespaces other than LM_ID_BASE.
+ - An object is proxied into a namespace by dlmopen with RTLD_SHARED. */
struct link_map *l_real;
/* Number of the namespace this link map belongs to. */
@@ -180,6 +181,7 @@ struct link_map
unsigned int l_relocated:1; /* Nonzero if object's relocations done. */
unsigned int l_init_called:1; /* Nonzero if DT_INIT function called. */
unsigned int l_global:1; /* Nonzero if object in _dl_global_scope. */
+ unsigned int l_proxy:1; /* Nonzero if object is a shallow copy. */
unsigned int l_reserved:2; /* Reserved for internal use. */
unsigned int l_phdr_allocated:1; /* Nonzero if the data structure pointed
to by `l_phdr' is allocated. */
diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 08791fbc0f..641176e7d9 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -978,6 +978,11 @@ extern lookup_t _dl_lookup_symbol_x (const char *undef,
struct link_map *skip_map)
attribute_hidden;
+/* Proxy an existing link map entry into a new link map */
+extern struct link_map *_dl_new_proxy (struct link_map *old,
+ int mode,
+ Lmid_t nsid)
+ attribute_hidden;
/* Restricted version of _dl_lookup_symbol_x. Searches MAP (and only
MAP) for the symbol UNDEF_NAME, with GNU hash NEW_HASH (computed
diff --git a/sysdeps/mips/bits/dlfcn.h b/sysdeps/mips/bits/dlfcn.h
index 5cec898de3..898797f863 100644
--- a/sysdeps/mips/bits/dlfcn.h
+++ b/sysdeps/mips/bits/dlfcn.h
@@ -32,6 +32,16 @@
visible as if the object were linked directly into the program. */
#define RTLD_GLOBAL 0x0004
+/* If the following bit is set in the MODE argument to dlmopen
+ then the target object is loaded into the main namespace (if
+ it is not already there) and a shallow copy (proxy) is placed
+ in the target namespace: This allows multiple namespaces to
+ share a single instance of a DSO. */
+#define RTLD_SHARED 0x00020
+
+/* Suppress RTLD_SHARED and/or DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE */
+#define RTLD_ISOLATE 0x00040
+
/* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
The implementation does this by default and so we can define the
value to zero. */
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [RFC][PATCH v10 6/7] Add dlmopen / RTLD_SHARED tests
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
` (4 preceding siblings ...)
2021-03-22 15:41 ` [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag " Vivek Das Mohapatra
@ 2021-03-22 15:41 ` Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 7/7] Restore separate libc loading for the TLS/namespace storage test Vivek Das Mohapatra
` (2 subsequent siblings)
8 siblings, 0 replies; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
---
elf/Makefile | 101 +++-
elf/tst-dlmopen-auditmod.c | 23 +
elf/tst-dlmopen-common.h | 32 +
elf/tst-dlmopen-main.h | 873 +++++++++++++++++++++++++++
elf/tst-dlmopen-modules.h | 21 +
elf/tst-dlmopen-rtld-audit-shared1.c | 8 +
elf/tst-dlmopen-rtld-audit-shared2.c | 8 +
elf/tst-dlmopen-rtld-audit-shared3.c | 7 +
elf/tst-dlmopen-rtld-audit-shared4.c | 8 +
elf/tst-dlmopen-rtld-audit-shared5.c | 8 +
elf/tst-dlmopen-rtld-audit-shared6.c | 8 +
elf/tst-dlmopen-rtld-audit-unique1.c | 7 +
elf/tst-dlmopen-rtld-audit-unique2.c | 7 +
elf/tst-dlmopen-rtld-audit-unique3.c | 7 +
elf/tst-dlmopen-rtld-audit-unique4.c | 7 +
elf/tst-dlmopen-rtld-audit-unique5.c | 7 +
elf/tst-dlmopen-rtld-audit-unique6.c | 7 +
elf/tst-dlmopen-rtld-shared1.c | 7 +
elf/tst-dlmopen-rtld-shared1.h | 64 ++
elf/tst-dlmopen-rtld-shared2.c | 7 +
elf/tst-dlmopen-rtld-shared2.h | 66 ++
elf/tst-dlmopen-rtld-shared3.c | 7 +
elf/tst-dlmopen-rtld-shared3.h | 43 ++
elf/tst-dlmopen-rtld-shared4.c | 7 +
elf/tst-dlmopen-rtld-shared4.h | 14 +
elf/tst-dlmopen-rtld-shared5.c | 7 +
elf/tst-dlmopen-rtld-shared5.h | 25 +
elf/tst-dlmopen-rtld-shared6.c | 7 +
elf/tst-dlmopen-rtld-shared6.h | 36 ++
elf/tst-dlmopen-rtld-unique1.c | 7 +
elf/tst-dlmopen-rtld-unique1.h | 86 +++
elf/tst-dlmopen-rtld-unique2.c | 7 +
elf/tst-dlmopen-rtld-unique2.h | 25 +
elf/tst-dlmopen-rtld-unique3.c | 7 +
elf/tst-dlmopen-rtld-unique3.h | 13 +
elf/tst-dlmopen-rtld-unique4.c | 7 +
elf/tst-dlmopen-rtld-unique4.h | 14 +
elf/tst-dlmopen-rtld-unique5.c | 7 +
elf/tst-dlmopen-rtld-unique5.h | 58 ++
elf/tst-dlmopen-rtld-unique6.c | 7 +
elf/tst-dlmopen-rtld-unique6.h | 51 ++
elf/tst-dlmopen-sharedmod-norm.c | 11 +
elf/tst-dlmopen-sharedmod-uniq.c | 11 +
elf/tst-dlmopen-std-do-test.c | 12 +
44 files changed, 1751 insertions(+), 1 deletion(-)
create mode 100644 elf/tst-dlmopen-auditmod.c
create mode 100644 elf/tst-dlmopen-common.h
create mode 100644 elf/tst-dlmopen-main.h
create mode 100644 elf/tst-dlmopen-modules.h
create mode 100644 elf/tst-dlmopen-rtld-audit-shared1.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared2.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared3.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared4.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared5.c
create mode 100644 elf/tst-dlmopen-rtld-audit-shared6.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique1.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique2.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique3.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique4.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique5.c
create mode 100644 elf/tst-dlmopen-rtld-audit-unique6.c
create mode 100644 elf/tst-dlmopen-rtld-shared1.c
create mode 100644 elf/tst-dlmopen-rtld-shared1.h
create mode 100644 elf/tst-dlmopen-rtld-shared2.c
create mode 100644 elf/tst-dlmopen-rtld-shared2.h
create mode 100644 elf/tst-dlmopen-rtld-shared3.c
create mode 100644 elf/tst-dlmopen-rtld-shared3.h
create mode 100644 elf/tst-dlmopen-rtld-shared4.c
create mode 100644 elf/tst-dlmopen-rtld-shared4.h
create mode 100644 elf/tst-dlmopen-rtld-shared5.c
create mode 100644 elf/tst-dlmopen-rtld-shared5.h
create mode 100644 elf/tst-dlmopen-rtld-shared6.c
create mode 100644 elf/tst-dlmopen-rtld-shared6.h
create mode 100644 elf/tst-dlmopen-rtld-unique1.c
create mode 100644 elf/tst-dlmopen-rtld-unique1.h
create mode 100644 elf/tst-dlmopen-rtld-unique2.c
create mode 100644 elf/tst-dlmopen-rtld-unique2.h
create mode 100644 elf/tst-dlmopen-rtld-unique3.c
create mode 100644 elf/tst-dlmopen-rtld-unique3.h
create mode 100644 elf/tst-dlmopen-rtld-unique4.c
create mode 100644 elf/tst-dlmopen-rtld-unique4.h
create mode 100644 elf/tst-dlmopen-rtld-unique5.c
create mode 100644 elf/tst-dlmopen-rtld-unique5.h
create mode 100644 elf/tst-dlmopen-rtld-unique6.c
create mode 100644 elf/tst-dlmopen-rtld-unique6.h
create mode 100644 elf/tst-dlmopen-sharedmod-norm.c
create mode 100644 elf/tst-dlmopen-sharedmod-uniq.c
create mode 100644 elf/tst-dlmopen-std-do-test.c
diff --git a/elf/Makefile b/elf/Makefile
index 22f2a87fcb..160135c9d6 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -196,6 +196,38 @@ static-dlopen-environment = \
tst-tls9-static-ENV = $(static-dlopen-environment)
tst-single_threaded-static-dlopen-ENV = $(static-dlopen-environment)
+dlmopen-rtld-tests-norm := \
+ tst-dlmopen-rtld-shared1 \
+ tst-dlmopen-rtld-shared2 \
+ tst-dlmopen-rtld-shared3 \
+ tst-dlmopen-rtld-shared4 \
+ tst-dlmopen-rtld-shared5 \
+ tst-dlmopen-rtld-shared6
+
+dlmopen-rtld-tests-uniq := \
+ tst-dlmopen-rtld-unique1 \
+ tst-dlmopen-rtld-unique2 \
+ tst-dlmopen-rtld-unique3 \
+ tst-dlmopen-rtld-unique4 \
+ tst-dlmopen-rtld-unique5 \
+ tst-dlmopen-rtld-unique6
+
+dlmopen-rtld-audit-tests-norm := \
+ tst-dlmopen-rtld-audit-shared1 \
+ tst-dlmopen-rtld-audit-shared2 \
+ tst-dlmopen-rtld-audit-shared3 \
+ tst-dlmopen-rtld-audit-shared4 \
+ tst-dlmopen-rtld-audit-shared5 \
+ tst-dlmopen-rtld-audit-shared6
+
+dlmopen-rtld-audit-tests-uniq := \
+ tst-dlmopen-rtld-audit-unique1 \
+ tst-dlmopen-rtld-audit-unique2 \
+ tst-dlmopen-rtld-audit-unique3 \
+ tst-dlmopen-rtld-audit-unique4 \
+ tst-dlmopen-rtld-audit-unique5 \
+ tst-dlmopen-rtld-audit-unique6
+
tests += restest1 preloadtest loadfail multiload origtest resolvfail \
constload1 order noload filter \
reldep reldep2 reldep3 reldep4 nodelete nodelete2 \
@@ -231,7 +263,11 @@ tests-internal += loadtest unload unload2 circleload1 \
neededtest neededtest2 neededtest3 neededtest4 \
tst-tls3 tst-tls6 tst-tls7 tst-tls8 tst-dlmopen2 \
tst-ptrguard1 tst-stackguard1 tst-libc_dlvsym \
- tst-create_format1 tst-tls-surplus tst-dl-hwcaps_split
+ tst-create_format1 tst-tls-surplus tst-dl-hwcaps_split \
+ $(dlmopen-rtld-tests-norm) \
+ $(dlmopen-rtld-tests-uniq) \
+ $(dlmopen-rtld-audit-tests-norm) \
+ $(dlmopen-rtld-audit-tests-uniq)
tests-container += tst-pldd tst-dlopen-tlsmodid-container \
tst-dlopen-self-container tst-preload-pthread-libc
test-srcs = tst-pathopt
@@ -286,6 +322,9 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
$(modules-execstack-$(have-z-execstack)) \
tst-dlopenrpathmod tst-deep1mod1 tst-deep1mod2 tst-deep1mod3 \
tst-dlmopen1mod tst-auditmod1 \
+ tst-dlmopen-sharedmod-norm \
+ tst-dlmopen-sharedmod-uniq \
+ tst-dlmopen-auditmod \
unload3mod1 unload3mod2 unload3mod3 unload3mod4 \
unload4mod1 unload4mod2 unload4mod3 unload4mod4 \
unload6mod1 unload6mod2 unload6mod3 \
@@ -325,6 +364,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
tst-tlsalign-lib tst-nodelete-opened-lib tst-nodelete2mod \
tst-audit11mod1 tst-audit11mod2 tst-auditmod11 \
tst-audit12mod1 tst-audit12mod2 tst-audit12mod3 tst-auditmod12 \
+ tst-dlmopen-auditmod \
tst-latepthreadmod $(tst-tls-many-dynamic-modules) \
tst-nodelete-dlclose-dso tst-nodelete-dlclose-plugin \
tst-main1mod tst-libc_dlvsym-dso tst-absolute-sym-lib \
@@ -827,6 +867,9 @@ tst-nodelete-uniquemod.so-no-z-defs = yes
tst-nodelete-rtldmod.so-no-z-defs = yes
tst-nodelete-zmod.so-no-z-defs = yes
tst-nodelete2mod.so-no-z-defs = yes
+tst-dlmopen-sharedmod-norm.so-no-z-defs = yes
+tst-dlmopen-sharedmod-uniq.so-no-z-defs = yes
+tst-dlmopen-auditmod.so-no-z-defs = yes
ifeq ($(build-shared),yes)
# Build all the modules even when not actually running test programs.
@@ -1305,6 +1348,62 @@ $(objpfx)tst-dlmopen2.out: $(objpfx)tst-dlmopen1mod.so
$(objpfx)tst-dlmopen3: $(libdl)
$(objpfx)tst-dlmopen3.out: $(objpfx)tst-dlmopen1mod.so
+ifneq ($(ld-zunique),yes)
+$(objpfx)tst-dlmopen-sharedmod-uniq.so: $(common-objpfx)dynamic-notes.os
+else
+LDFLAGS-tst-dlmopen-sharedmod-uniq.so = -Wl,-z,unique
+endif
+$(objpfx)tst-dlmopen-sharedmod-norm.so: $(libdl)
+$(objpfx)tst-dlmopen-sharedmod-uniq.so: $(libdl)
+$(objpfx)tst-dlmopen-auditmod.so: $(libdl)
+
+dlmopen-rtld-tests-norm-executables := \
+ $(foreach x,$(dlmopen-rtld-tests-norm),$(objpfx)$(x))
+dlmopen-rtld-tests-norm-out := \
+ $(foreach x,$(dlmopen-rtld-tests-norm),$(objpfx)$(x).out)
+
+dlmopen-rtld-tests-uniq-executables := \
+ $(foreach x,$(dlmopen-rtld-tests-uniq),$(objpfx)$(x))
+dlmopen-rtld-tests-uniq-out := \
+ $(foreach x,$(dlmopen-rtld-tests-uniq),$(objpfx)$(x).out)
+
+dlmopen-rtld-audit-tests-norm-executables := \
+ $(foreach x,$(dlmopen-rtld-audit-tests-norm),$(objpfx)$(x))
+dlmopen-rtld-audit-tests-norm-out := \
+ $(foreach x,$(dlmopen-rtld-audit-tests-norm),$(objpfx)$(x).out)
+
+dlmopen-rtld-audit-tests-uniq-executables := \
+ $(foreach x,$(dlmopen-rtld-audit-tests-uniq),$(objpfx)$(x))
+dlmopen-rtld-audit-tests-uniq-out := \
+ $(foreach x,$(dlmopen-rtld-audit-tests-uniq),$(objpfx)$(x).out)
+
+$(dlmopen-rtld-tests-norm-executables): $(libdl)
+$(dlmopen-rtld-tests-norm-out): $(objpfx)tst-dlmopen-sharedmod-norm.so
+
+$(dlmopen-rtld-tests-uniq-executables): $(libdl)
+$(dlmopen-rtld-tests-uniq-out): $(objpfx)tst-dlmopen-sharedmod-uniq.so
+
+
+$(dlmopen-rtld-audit-tests-norm-executables): $(libdl)
+$(dlmopen-rtld-audit-tests-norm-out): $(objpfx)tst-dlmopen-sharedmod-norm.so
+$(dlmopen-rtld-audit-tests-norm-out): $(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-shared1-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-shared2-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-shared3-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-shared4-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-shared5-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-shared6-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+
+$(dlmopen-rtld-audit-tests-uniq-executables): $(libdl)
+$(dlmopen-rtld-audit-tests-uniq-out): $(objpfx)tst-dlmopen-sharedmod-uniq.so
+$(dlmopen-rtld-audit-tests-uniq-out): $(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-unique1-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-unique2-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-unique3-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-unique4-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-unique5-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+tst-dlmopen-rtld-audit-unique6-ENV = LD_AUDIT=$(objpfx)tst-dlmopen-auditmod.so
+
$(objpfx)tst-audit1.out: $(objpfx)tst-auditmod1.so
tst-audit1-ENV = LD_AUDIT=$(objpfx)tst-auditmod1.so
diff --git a/elf/tst-dlmopen-auditmod.c b/elf/tst-dlmopen-auditmod.c
new file mode 100644
index 0000000000..d630a26cd6
--- /dev/null
+++ b/elf/tst-dlmopen-auditmod.c
@@ -0,0 +1,23 @@
+/* Audit module for tst-dlmopen-rtld-audit-*
+ 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/>. */
+
+unsigned int
+la_version (unsigned int version)
+{
+ return version;
+}
diff --git a/elf/tst-dlmopen-common.h b/elf/tst-dlmopen-common.h
new file mode 100644
index 0000000000..f070bf03b1
--- /dev/null
+++ b/elf/tst-dlmopen-common.h
@@ -0,0 +1,32 @@
+/* Common infrastructure for tst-dlmopen-rtld-*
+ 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/>. */
+
+#pragma once
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <gnu/lib-names.h>
+
+typedef struct
+{
+ const char *name;
+ void *free;
+} dlmopen_testresult;
+
+typedef dlmopen_testresult * (*dlmopen_testfunc) (void);
diff --git a/elf/tst-dlmopen-main.h b/elf/tst-dlmopen-main.h
new file mode 100644
index 0000000000..2f264499aa
--- /dev/null
+++ b/elf/tst-dlmopen-main.h
@@ -0,0 +1,873 @@
+/* Main infrastructure for tst-dlmopen-rtld-*
+ 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/>. */
+
+#pragma once
+
+/* dlmopen +/- RTLD_SHARED/RTLD_ISOLATE semantics:
+
+ RTLD_ISOLATE's purpose is to suppress all shared behaviour,
+ mainly used for LD_AUDIT code paths but available to the user
+ and also useful for constructing test case preconditions.
+
+ dlmopen should have the following behaviour:
+
+ Notation:
+ Number of namespace ('+' means make a new one in an empty NS)
+ |
+ [+]X[p] - p indicates a proxy
+ |
+ + -> new enry after the dlmopen call
+
+ Need to be able to inspect:
+
+ list of dl handles before we start (base state)
+ list of dl handles after an action in each namespace
+ ns of a given dl handle
+ _real_ ns of a given handle (ie where does a proxy point)
+
+ In the tables below each line represents a separate test.
+
+ In practice many tests can be implemented in the same executable
+ as some tests set up the required preconditions for other tests
+ if they complete successfully.
+
+ Target is a normal DSO:
+ Before | Target NS | RTLD Flags | After | handle NS | libc NS
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-shared1:
+ -------+-----------+------------+--------+-----------+---------
+ - | 0 | - | +0 | 0 | 0
+ 0 | 0 | - | 0 | 0 | 0
+ 0 | 0 | SHARED | 0 | 0 | 0
+ 0 | + | - | 0,+1 | 1 | 0
+ 0,1 | 0 | - | 0,1 | 0 | 0
+ 0,1 | 0 | SHARED | 0,1 | 0 | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-shared2:
+ -------+-----------+------------+--------+-----------+---------
+ - | 0 | SHARED | +0 | 0 | 0
+ 0 | + | SHARED | 0,+1p | 1p | 0
+ 0,1p | 0 | - | 0,1p | 0 | 0
+ 0,1p | 0 | SHARED | 0,1p | 0 | 0
+ 0,1p | 1 | - | 0,1p | 1p | 0
+ 0,1p | 1 | SHARED | 0,1p | 1p | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-shared3
+ -------+-----------+------------+--------+-----------+---------
+ - | + | - | +1 | 1 | 0
+ 1 | 0 | - | +0,1 | 0 | 0
+ 0,1 | 1 | - | 0,1 | 1 | 0
+ 0,1 | 1 | SHARED | 0,1 | ERR | -
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-shared4
+ -------+-----------+------------+--------+-----------+---------
+ - | + | SHARED | +0,+1p | 1p | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-shared5
+ -------+-----------+------------+--------+-----------+---------
+ 1 | 0 | SHARED | +0,1 | 0 | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-shared6
+ -------+-----------+------------+--------+-----------+---------
+ 1 | 1 | - | 1 | 0 | 0
+ 1 | 1 | SHARED | 1 | ERR | -
+
+ Target is a DF_GNU_1_UNIQUE DSO:
+ Before | Target NS | RTLD Flags | After | handle NS | libc NS
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-unique1:
+ -------+-----------+------------+--------+-----------+---------
+ - | 0 | - | +0 | 0 | 0
+ 0 | 0 | - | 0 | 0 | 0
+ 0 | 0 | SHARED | 0 | 0 | 0
+ 0 | + | - | 0,+1p | 1p | 0
+ 0,1p | 0 | - | 0,1p | 0 | 0
+ 0,1p | 0 | SHARED | 0,1p | 0 | 0
+ 0,1p | 1 | - | 0,1p | 1p | 0
+ 0,1p | 1 | SHARED | 0,1p | 1p | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-unique2:
+ -------+-----------+------------+--------+-----------+---------
+ - | 0 | SHARED | +0 | 0 | 0
+ 0 | + | SHARED | 0,+1p | 1p | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-unique3:
+ -------+-----------+------------+--------+-----------+---------
+ - | + | - | +0,+1p | 1p | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-unique4:
+ -------+-----------+------------+--------+-----------+---------
+ - | + | SHARED | +0,+1p | 1p | 0
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-unique5:
+ -------+-----------+------------+--------+-----------+---------
+ - | + | ISOLATE | +1 | 1 | 1
+ 1 | 0 | - | +0,1 | 0 | 0
+ 0,1 | 0 | - | 0,1 | 0 | 0
+ 0,1 | 0 | SHARED | 0,1 | 0 | 0
+ 0,1 | 1 | - | 0,1 | ERR | -
+ =======+===========+============+========+===========+=========
+ dlmopen-rtld-unique6:
+ -------+-----------+------------+--------+-----------+---------
+ - | +1 | ISOLATE | +1 | 1 | 1
+ 1 | 1 | - | 1 | ERR | -
+ 1 | 1 | SHARED | 1 | ERR | -
+ 1 | 0 | SHARED | +0,1 | 0 | 0
+ 0,1 | 1 | SHARED | 0,1 | ERR | -
+*/
+
+#include "tst-dlmopen-common.h"
+#include <dl-dtprocnum.h>
+#include <link.h>
+#include <array_length.h>
+#include <support/check.h>
+#include <support/support.h>
+#include <support/test-driver.h>
+
+#define DSO_NORMAL "$ORIGIN/tst-dlmopen-sharedmod-norm.so"
+#define DSO_UNIQUE "$ORIGIN/tst-dlmopen-sharedmod-uniq.so"
+#define DSO_TESTFN "rtld_shared_testfunc"
+#define DSO_NAMESTUB "tst-dlmopen-sharedmod-"
+#define MAX_NS 16
+
+#define ERROR(test, fmt, ...) \
+ support_print_failure_impl (__FILE__, __LINE__, "%s (%s): " fmt, \
+ test->name, test->desc, ##__VA_ARGS__)
+
+typedef enum
+ {
+ NONE = 0,
+ DSO = 1,
+ PROXY = 2,
+ NEW = 4,
+ } dso_type;
+
+typedef struct
+{
+ const char *name;
+ const char *desc;
+ int is_prep_stage;
+ const char *dso_name;
+ int failure;
+
+ struct
+ {
+ const char *dso_path;
+ Lmid_t ns;
+ int flags;
+ } args;
+
+ dso_type preloaded[MAX_NS];
+ dso_type loaded[MAX_NS];
+ dso_type handle_type;
+ Lmid_t handle_ns;
+ Lmid_t free_ns;
+} dlmopen_test_spec;
+
+typedef struct { void *handle; Lmid_t ns; } test_handle;
+static test_handle cached_handles[32];
+
+static void
+cache_test_handle (void *handle, Lmid_t ns)
+{
+ int i;
+
+ for (i = 0; i < array_length(cached_handles); i++)
+ if (cached_handles[i].handle == NULL)
+ {
+ cached_handles[i].handle = handle;
+ cached_handles[i].ns = ns;
+ break;
+ }
+}
+
+__attribute__((unused))
+static struct link_map *
+link_map_of_dl_handle (void *handle)
+{
+ struct link_map *lm = NULL;
+
+ if (dlinfo (handle, RTLD_DI_LINKMAP, &lm) == 0)
+ return lm;
+
+ printf ("dlinfo (LINKMAP) for %s in %s failed: %s\n",
+ LIBC_SO, __func__, dlerror ());
+
+ return NULL;
+}
+
+__attribute__((unused))
+static Lmid_t
+ns_of_dl_handle (void *handle)
+{
+ Lmid_t ns = 0;
+
+ if (dlinfo (handle, RTLD_DI_LMID, &ns) == 0)
+ return ns;
+
+ printf ("dlinfo (LMID) for %s in %s failed: %s\n",
+ LIBC_SO, __func__, dlerror ());
+
+ return -1;
+}
+
+__attribute__((unused))
+static Lmid_t real_ns_of_dl_handle (void *handle)
+{
+ Lmid_t ns = 0;
+ struct link_map *lm = link_map_of_dl_handle (handle);
+
+ if (lm == NULL)
+ return -1;
+
+ if (lm->l_proxy)
+ ns = ns_of_dl_handle ((void *) lm->l_real);
+ else
+ ns = ns_of_dl_handle (handle);
+
+ return ns;
+}
+
+__attribute__((unused))
+static const char *str_soname (const char *name)
+{
+ char *slash = NULL;
+
+ if (name == NULL)
+ return NULL;
+
+ if ((slash = strrchr (name, '/')))
+ return ++slash;
+ else
+ return name;
+}
+
+__attribute__((unused))
+static const char *lm_name (struct link_map *lm)
+{
+ if (lm)
+ return lm->l_name;
+
+ return NULL;
+}
+
+
+static int dlm_dso_is_loaded (void *handle)
+{
+ if (handle != RTLD_DEFAULT)
+ {
+ Dl_info sinfo = {};
+
+ if (((struct link_map *) handle)->l_type != lt_loaded)
+ return 0;
+
+ verbose_printf ("checking %p %s for %s\n",
+ handle, ((struct link_map *)handle)->l_name, DSO_TESTFN);
+
+ void *symbol = dlsym (handle, DSO_TESTFN);
+
+ dladdr (symbol, &sinfo);
+ verbose_printf (" -> %s (in %s (%p))\n",
+ sinfo.dli_fname,
+ sinfo.dli_sname,
+ sinfo.dli_saddr);
+
+ return symbol ? 1 : 0;
+ }
+
+ for (int i = 0; i < array_length(cached_handles); i++)
+ {
+ if (cached_handles[i].handle == NULL)
+ break;
+
+ if (((struct link_map *) cached_handles[i].handle)->l_type != lt_loaded)
+ continue;
+
+ verbose_printf ("checking %p %s for %s\n",
+ cached_handles[i].handle,
+ ((struct link_map *)cached_handles[i].handle)->l_name,
+ DSO_TESTFN);
+
+ if (dlsym (cached_handles[i].handle, DSO_TESTFN) != NULL)
+ return 1;
+ }
+
+ return 0;
+}
+
+static int
+call_testfunc (dlmopen_test_spec *test, void *handle)
+{
+ Dl_info dli = {};
+ struct link_map *lm = NULL;
+ dlmopen_testfunc func = NULL;
+ dlmopen_testresult *result = NULL;
+
+ if (handle != RTLD_DEFAULT)
+ func = dlsym (handle, DSO_TESTFN);
+
+ if (func == NULL)
+ {
+ ERROR (test, "test function %s not found\n", DSO_TESTFN);
+ return 0;
+ }
+
+ result = (func)();
+
+ if (result == NULL)
+ {
+ ERROR (test, "test function %s returned NULL\n", DSO_TESTFN);
+ return 0;
+ }
+
+ dladdr1 (result->free, &dli, (void **)&lm, RTLD_DL_LINKMAP);
+
+ if (lm == NULL)
+ {
+ ERROR (test, "free() implementation from test module is invalid\n");
+ return 0;
+ }
+
+ if (lm->l_ns != test->free_ns)
+ {
+ ERROR (test,
+ "free() function from test module was from ns %d, expected %d\n",
+ (int)lm->l_ns, (int)test->free_ns);
+ return 0;
+ }
+
+ printf ("%s: %s: %s in ns %d using free() from ns %d: OK\n",
+ test->name, test->args.dso_path, DSO_TESTFN,
+ (int)test->handle_ns, (int)lm->l_ns);
+
+ return 1;
+}
+
+static void *link_map_snapshot_array (void *handle, void *func, Lmid_t ns, size_t *len)
+{
+ struct link_map *lm = NULL;
+ struct link_map *start = NULL;
+
+ if (len != NULL)
+ *len = 0;
+
+ if (handle != NULL)
+ {
+ dlinfo (handle, RTLD_DI_LINKMAP, &lm);
+ }
+ else if (func != NULL)
+ {
+ Dl_info dli = {};
+
+ dladdr1 (func, &dli, (void **)&lm, RTLD_DL_LINKMAP);
+ }
+ else if (ns >= LM_ID_BASE)
+ {
+ for (int i = 0; i < array_length(cached_handles); i++)
+ {
+ if (cached_handles[i].handle == NULL)
+ break;
+
+ if (cached_handles[i].ns != ns)
+ continue;
+
+ dlinfo (cached_handles[i].handle, RTLD_DI_LINKMAP, &lm);
+ break;
+ }
+ }
+
+ if (lm == NULL)
+ return NULL;
+
+ start = lm;
+
+ while (start->l_prev)
+ start = start->l_prev;
+
+ size_t lm_size = 0;
+
+ for (lm = start; lm; lm = lm->l_next)
+ lm_size++;
+
+ struct link_map **lm_list = xcalloc (lm_size + 1, sizeof (struct link_map *));
+
+ if (len != NULL)
+ *len = lm_size;
+
+ int i = 0;
+
+ for (lm = start; lm; lm = lm->l_next)
+ lm_list[i++] = lm;
+ lm_list[i] = NULL;
+
+ return lm_list;
+}
+
+__attribute__((unused))
+static int search_link_map_array (struct link_map **lma, size_t len, void *handle)
+{
+ if (lma == NULL)
+ return 0;
+
+ if (len == 0)
+ return 0;
+
+ struct link_map *target = link_map_of_dl_handle (handle);
+
+ for (int i = 0; i < len; i++)
+ {
+ if (handle == (struct link_map *)(lma[i]))
+ return 1;
+
+ if (target->l_proxy)
+ if (target->l_real == (struct link_map *)(lma[i]))
+ return 1;
+ }
+
+ return 0;
+}
+
+#ifdef DEBUG_DSO_SEARCH
+#define TRACE2(fmt, ...) \
+ printf (" find-test-dso (%s @ %d): " fmt "\n", __FILE__, __LINE__, ##__VA_ARGS__)
+#else
+#define TRACE2(fmt, ...)
+#endif
+
+static struct link_map *
+find_test_dso_in_link_map_array (struct link_map **lma, size_t len)
+{
+ if (lma == NULL)
+ return NULL;
+
+ if (len == 0)
+ return NULL;
+
+ for (int i = 0; i < len; i++)
+ {
+ if ((lma[i] == NULL) || (lma[i]->l_name == NULL))
+ continue;
+
+ TRACE2 ("%p [%d/%d] %s", lma, i, (int)len - 1,
+ lma[i] ? (lma[i]->l_name ?: "???.so") : "NULL" );
+
+ if (lma[i] && lma[i]->l_name)
+ if (strstr (lma[i]->l_name, DSO_NAMESTUB))
+ if (dlsym (lma[i], DSO_TESTFN) != NULL)
+ return (struct link_map *)lma[i];
+ }
+
+ return NULL;
+}
+
+__attribute__((unused))
+static void *link_map_list (void *handle, void *func, int *len, Lmid_t *ns)
+{
+ struct link_map *lm = NULL;
+ struct link_map *start = NULL;
+
+ if (len)
+ *len = 0;
+
+ if (handle != NULL)
+ {
+ dlinfo (handle, RTLD_DI_LINKMAP, &lm);
+ }
+ else if (func != NULL)
+ {
+ Dl_info dli = {};
+
+ dladdr1 (func, &dli, (void **)&lm, RTLD_DL_LINKMAP);
+ }
+
+ if (lm == NULL)
+ return NULL;
+
+ if (ns)
+ *ns = lm->l_ns;
+
+ /* Rewind to start of link map list: */
+ start = lm;
+
+ while (start->l_prev != NULL)
+ start = start->l_prev;
+
+ size_t lm_size = 0;
+
+ for (lm = start; lm != NULL; lm = lm->l_next)
+ lm_size++;
+
+ if (len != NULL)
+ *len = lm_size;
+
+ return start;
+}
+
+#ifdef DEBUG_DLMOPEN_TEST_WRAPPER
+#define TRACE(fmt, ...) \
+ printf ("%s (%s @ %d): " fmt "\n", test->name, __FILE__, __LINE__, ##__VA_ARGS__)
+#else
+#define TRACE(fmt, ...)
+#endif
+
+static bool process_test_spec (dlmopen_test_spec *test)
+{
+ void *handle = NULL;
+ size_t lm_before_len[MAX_NS] = { 0 };
+ size_t lm_after_len[MAX_NS] = { 0 };
+ struct link_map **lm_before[MAX_NS] = { NULL };
+ struct link_map **lm_after[MAX_NS] = { NULL };
+ struct link_map *preloads[MAX_NS] = { NULL };
+ int want_preload = 0;
+ int test_status = false;
+
+ TRACE("LD_AUDIT = %s", getenv("LD_AUDIT") ?: "-");
+ TRACE("BEFORE SNAPSHOTS: %p", &lm_before[0]);
+ TRACE("AFTER SNAPSHOTS: %p", &lm_after[0]);
+ TRACE("preloads : %p", preloads);
+ TRACE("setup done");
+
+ if (test->args.dso_path && *test->args.dso_path && !test->dso_name)
+ test->dso_name = str_soname (test->args.dso_path);
+
+ TRACE("DSO short name: %s", test->dso_name);
+
+ /* Get the existing link map contents before the test runs: */
+ lm_before[0] = link_map_snapshot_array (NULL, process_test_spec,
+ LM_ID_BASE, &lm_before_len[0]);
+ for (int i = 1; i < MAX_NS; i++)
+ lm_before[i] = link_map_snapshot_array (NULL, NULL, i, &lm_before_len[i]);
+
+ TRACE("link map snapshots cached");
+
+ for (int i = 0; i < MAX_NS; i++)
+ {
+ if (test->preloaded[i] & PROXY)
+ {
+ struct link_map **lm = lm_before[i];
+ want_preload++;
+
+ if (lm != NULL)
+ for (int j = 0; (preloads[i] == NULL) && (j < lm_before_len[i]); j++)
+ if (dlm_dso_is_loaded (lm[j]) && lm[j]->l_proxy)
+ preloads[i] = lm[j];
+
+ if (preloads[i] == NULL)
+ {
+ ERROR (test,
+ "needed proxy for %s preloaded in NS %d, not found\n",
+ test->dso_name, i);
+ goto cleanup;
+ }
+ }
+ else if (test->preloaded[i] & DSO)
+ {
+ struct link_map **lm = lm_before[i];
+ int lm_max = lm_before_len[i];
+ want_preload++;
+
+ if (lm != NULL)
+ for (int j = 0; !preloads[i] && (j < lm_max); j++)
+ {
+ if (dlm_dso_is_loaded (lm[j]) && !lm[j]->l_proxy)
+ preloads[i] = lm[j];
+ }
+ if (!preloads[i])
+ {
+ ERROR (test,
+ "needed %s preloaded in NS %d, not found\n",
+ test->dso_name, i);
+ goto cleanup;
+ }
+ }
+ }
+ TRACE("preload checks (A)");
+
+ if (dlm_dso_is_loaded (RTLD_DEFAULT))
+ {
+ /* Test DSO module must _not_ be preloaded, and is: */
+ if (!want_preload)
+ {
+ ERROR (test, "DSO %s unexpectedly loaded before test\n", test->dso_name);
+ goto cleanup;
+ }
+ }
+ else
+ {
+ /* DSO is not loaded, and must be. In theory we can never see
+ this error as it should be caught by the preceding preload loop. */
+ if (want_preload)
+ {
+ ERROR (test, "DSO %s must be preloaded (and is not)\n", test->args.dso_path);
+ goto cleanup;
+ }
+ }
+ TRACE("preload checks (B) %s", test->name);
+
+ if (!(test->args.flags & (RTLD_NOW|RTLD_LAZY)))
+ test->args.flags |= RTLD_NOW;
+
+ handle = dlmopen (test->args.ns, test->args.dso_path, test->args.flags);
+ TRACE("dlmopen returned %p", handle);
+
+ if (handle == NULL)
+ {
+ const char *status = "failed";
+ const char *plabel = "";
+
+ if (test->failure)
+ {
+ test_status = true;
+
+ printf ("%s: dlmopen(%s, %d, 0x%0x) failed: OK (EXPECTED)\n",
+ test->name, test->args.dso_path,
+ (int)test->args.ns, (int)test->args.flags);
+ printf ("Returned: %p\n\n", handle);
+
+ goto cleanup;
+ }
+
+ if (test->is_prep_stage)
+ plabel = "(during setup of preconditions): ";
+
+ if (test->args.ns == LM_ID_BASE)
+ ERROR (test, "%sdlmopen (LM_ID_BASE, \"%s\", 0x%x) %s: %s\n",
+ plabel, test->args.dso_path, test->args.flags, status, dlerror ());
+ else
+ ERROR (test, "%sdlmopen (%d, \"%s\", 0x%x) %s: %s\n",
+ plabel, (int)test->args.ns, test->args.dso_path, test->args.flags, status,
+ dlerror ());
+
+ goto cleanup;
+ }
+ else if (test->failure)
+ {
+ ERROR (test, "dlmopen() call should have failed, but did not\n");
+ goto cleanup;
+ }
+
+ TRACE("return status checked");
+
+ if (!dlm_dso_is_loaded (handle))
+ {
+ ERROR (test, "DSO %s (%p) missing function (%s)\n",
+ test->args.dso_path, handle, DSO_TESTFN);
+ goto cleanup;
+ }
+
+ TRACE ("loaded DSO sanity checked");
+
+ Lmid_t hns = ns_of_dl_handle (handle);
+ Lmid_t real_hns = real_ns_of_dl_handle (handle);
+ Lmid_t proxy_ns = 0;
+
+ call_testfunc (test, handle);
+ TRACE (DSO_TESTFN "called");
+
+ cache_test_handle (handle, hns);
+ TRACE ("handle %p cached (ns %d)", handle, (int)hns);
+
+ /* If the real ns was different to the apparent one
+ then we have a proxy and we need to shuffle the values,
+ else leave the proxy ns as 0 as an expect.proxy_ns of 0
+ means we weren't expecting a proxy: */
+ if (real_hns != hns)
+ {
+ proxy_ns = hns;
+ hns = real_hns;
+ }
+
+ if (proxy_ns)
+ printf ("Returned: proxy ns:%d (real ns: %d)\n\n", (int)proxy_ns, (int)hns);
+ else
+ printf ("Returned: dso ns:%d\n\n", (int)hns);
+
+ Lmid_t expected;
+ if (test->handle_type & PROXY)
+ expected = proxy_ns;
+ else
+ expected = hns;
+
+ TRACE("check expected ns %d", (int)expected);
+
+ if (test->args.ns == LM_ID_NEWLM)
+ {
+ if (expected <= LM_ID_BASE)
+ {
+ ERROR (test, "DSO should have been in NS > %d, was in %d\n",
+ LM_ID_BASE, (int)expected);
+ goto cleanup;
+ }
+
+ /* For any cases where we can't predict the namespace in advance: */
+ if (test->handle_ns == LM_ID_NEWLM)
+ test->handle_ns = expected;
+ }
+ else
+ {
+ if (test->args.ns != expected)
+ {
+ ERROR (test, "DSO should have been in NS %d, was in %d\n",
+ (int)test->args.ns, (int)expected);
+ goto cleanup;
+ }
+ }
+
+ TRACE("ns %d Ok", (int)expected);
+
+if (test->handle_type & PROXY) /* Expecting a proxy. */
+ {
+ if (proxy_ns != 0) /* Got a proxy. */
+ {
+ if (test->handle_ns != proxy_ns) /* But not in the right place. */
+ {
+ ERROR (test, "DSO proxy should have been in ns %d, was in %d\n",
+ (int)test->handle_ns, (int)proxy_ns);
+ goto cleanup;
+ }
+ }
+ else /* Didn't get a proxy. */
+ {
+ ERROR (test,
+ "DSO should have been a proxy in ns %d,"
+ " was a non-proxy in ns %d\n",
+ (int)test->handle_ns, (int)hns);
+ goto cleanup;
+ }
+ }
+ else /* Not expecting a proxy. */
+ {
+ if (proxy_ns > 0)
+ {
+ ERROR (test,
+ "DSO should NOT have been a proxy,"
+ " was a proxy in ns %d (real ns %d)\n",
+ (int)proxy_ns, (int)hns);
+ goto cleanup;
+ }
+
+ if (test->handle_ns != hns)
+ {
+ ERROR (test,
+ "DSO should have been in ns %d,"
+ " was in ns %d\n",
+ (int)test->handle_ns, (int)hns);
+ goto cleanup;
+ }
+ }
+ TRACE ("proxy status Ok");
+
+ /* Get the new link map contents after the test has run: */
+ lm_after[0] = link_map_snapshot_array (NULL, process_test_spec,
+ LM_ID_BASE, &lm_after_len[0]);
+ for (int i = 1; i < MAX_NS; i++)
+ lm_after[i] = link_map_snapshot_array (NULL, NULL, i, &lm_after_len[i]);
+
+ for (int i = 0; i < MAX_NS; i++)
+ {
+ TRACE("checking status of NS %d", i);
+ void *old_handle =
+ find_test_dso_in_link_map_array (lm_before[i], lm_before_len[i]);
+ TRACE ("old handle is %p", old_handle);
+
+ void *new_handle =
+ find_test_dso_in_link_map_array (lm_after[i], lm_after_len[i]);
+ TRACE ("new handle is %p", new_handle);
+
+ if (test->loaded[i] == NONE)
+ {
+ TRACE ("ns %d requirement is NONE", i);
+ if (old_handle != NULL)
+ {
+ ERROR (test,
+ "Unexpected preload DSO %s in ns %d\n",
+ lm_name (old_handle), i);
+ goto cleanup;
+ }
+ if (new_handle != NULL)
+ {
+ ERROR (test, "Unexpected new DSO %s in ns %d\n",
+ lm_name (new_handle), i);
+ goto cleanup;
+ }
+ continue;
+ }
+
+ if (test->loaded[i] & NEW)
+ {
+ TRACE("ns %d requirement is NEW", i);
+ if (old_handle != NULL)
+ {
+ ERROR (test,
+ "DSO in ns %d should have been a new load,"
+ " found to have been preloaded\n", i);
+ goto cleanup;
+ }
+ if (new_handle == NULL)
+ {
+ ERROR (test, "Expected DSO in ns %d, not found\n", i);
+ goto cleanup;
+ }
+ }
+ else
+ {
+ TRACE("ns %d requirement is OLD", i);
+ if (new_handle == NULL)
+ {
+ ERROR (test, "Expected new DSO in ns %d, not found\n", i);
+ goto cleanup;
+ }
+
+ if (old_handle != new_handle)
+ {
+ ERROR (test, "DSO in ns %d changed. This should be impossible, "
+ "sanity check the test code\n", i);
+ goto cleanup;
+ }
+ }
+
+ if (test->loaded[i] & PROXY)
+ {
+ TRACE ("rechecking DSO status in ns %d", i);
+ if (!((struct link_map *)new_handle)->l_proxy)
+ {
+ ERROR (test, "DSO in ns %d should be a proxy but is not\n", i);
+ goto cleanup;
+ }
+ }
+ else
+ {
+ TRACE ("rechecking proxy status in ns %d", i);
+ if (((struct link_map *)new_handle)->l_proxy)
+ {
+ ERROR (test, "DSO in ns %d should NOT be a proxy but is\n", i);
+ goto cleanup;
+ }
+ }
+ }
+
+ test_status = true;
+
+ cleanup:
+ for (int i = 0; i < MAX_NS; i++)
+ free (lm_after[i]);
+ for (int i = 0; i < MAX_NS; i++)
+ free (lm_before[i]);
+
+ return test_status;
+}
diff --git a/elf/tst-dlmopen-modules.h b/elf/tst-dlmopen-modules.h
new file mode 100644
index 0000000000..63aa7730e3
--- /dev/null
+++ b/elf/tst-dlmopen-modules.h
@@ -0,0 +1,21 @@
+/* Module-specific infrastructure for tst-dlmopen-rtld-*
+ 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/>. */
+
+#pragma once
+
+#include "tst-dlmopen-common.h"
diff --git a/elf/tst-dlmopen-rtld-audit-shared1.c b/elf/tst-dlmopen-rtld-audit-shared1.c
new file mode 100644
index 0000000000..f61e00d372
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-shared1.c
@@ -0,0 +1,8 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-shared1.h"
+
+#include "tst-dlmopen-std-do-test.c"
+
diff --git a/elf/tst-dlmopen-rtld-audit-shared2.c b/elf/tst-dlmopen-rtld-audit-shared2.c
new file mode 100644
index 0000000000..93d7c9d502
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-shared2.c
@@ -0,0 +1,8 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-shared2.h"
+
+#include "tst-dlmopen-std-do-test.c"
+
diff --git a/elf/tst-dlmopen-rtld-audit-shared3.c b/elf/tst-dlmopen-rtld-audit-shared3.c
new file mode 100644
index 0000000000..bc1e8f0345
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-shared3.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-shared3.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-audit-shared4.c b/elf/tst-dlmopen-rtld-audit-shared4.c
new file mode 100644
index 0000000000..0a0ecd4317
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-shared4.c
@@ -0,0 +1,8 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-shared4.h"
+
+#include "tst-dlmopen-std-do-test.c"
+
diff --git a/elf/tst-dlmopen-rtld-audit-shared5.c b/elf/tst-dlmopen-rtld-audit-shared5.c
new file mode 100644
index 0000000000..1585e48a95
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-shared5.c
@@ -0,0 +1,8 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-shared5.h"
+
+#include "tst-dlmopen-std-do-test.c"
+
diff --git a/elf/tst-dlmopen-rtld-audit-shared6.c b/elf/tst-dlmopen-rtld-audit-shared6.c
new file mode 100644
index 0000000000..f1b21c295b
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-shared6.c
@@ -0,0 +1,8 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-shared6.h"
+
+#include "tst-dlmopen-std-do-test.c"
+
diff --git a/elf/tst-dlmopen-rtld-audit-unique1.c b/elf/tst-dlmopen-rtld-audit-unique1.c
new file mode 100644
index 0000000000..5605967a5c
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-unique1.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-unique1.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-audit-unique2.c b/elf/tst-dlmopen-rtld-audit-unique2.c
new file mode 100644
index 0000000000..8a1d5317c8
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-unique2.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-unique2.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-audit-unique3.c b/elf/tst-dlmopen-rtld-audit-unique3.c
new file mode 100644
index 0000000000..31848ea9d8
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-unique3.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-unique3.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-audit-unique4.c b/elf/tst-dlmopen-rtld-audit-unique4.c
new file mode 100644
index 0000000000..c79cb378d5
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-unique4.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-unique4.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-audit-unique5.c b/elf/tst-dlmopen-rtld-audit-unique5.c
new file mode 100644
index 0000000000..790fed9b04
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-unique5.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-unique5.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-audit-unique6.c b/elf/tst-dlmopen-rtld-audit-unique6.c
new file mode 100644
index 0000000000..0b9bbabdd2
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-audit-unique6.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 2
+#include "tst-dlmopen-rtld-unique6.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-shared1.c b/elf/tst-dlmopen-rtld-shared1.c
new file mode 100644
index 0000000000..329a9a91d9
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared1.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-shared1.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-shared1.h b/elf/tst-dlmopen-rtld-shared1.h
new file mode 100644
index 0000000000..de718fd8ca
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared1.h
@@ -0,0 +1,64 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen:0:none--ns0",
+ .desc = "dlmopen as dlopen",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .loaded = { [0] = DSO|NEW },
+ .handle_type = DSO,
+ .handle_ns = LM_ID_BASE,
+ },
+ {
+ .name = "dlmopen:0:ns0--ns0",
+ .desc = "dlmopen a preloaded DSO in the base NS",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO },
+ .handle_type = DSO,
+ .handle_ns = LM_ID_BASE,
+ },
+ {
+ .name = "dlmopen-shared:0:ns0--ns0",
+ .desc = "dlmopen a preloaded DSO in the base NS with RTLD_SHARED",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO },
+ .handle_type = DSO,
+ .handle_ns = LM_ID_BASE,
+ },
+ {
+ .name = "dlmopen:0:ns0--nsX",
+ .desc = "dlmopen a preloaded DSO in the base NS into a new NS",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_NEWLM,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO|NEW },
+ .handle_type = DSO,
+ .handle_ns = EXPECTED_NS,
+ },
+ {
+ .name = "dlmopen:0:ns0-nsX--ns0-nsX",
+ .desc = "dlmopen a preloaded DSO in the base & secondary NS into the base NS",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .handle_type = DSO,
+ .handle_ns = LM_ID_BASE,
+ },
+ {
+ .name = "dlmopen-shared:0:ns0-nsX--ns0-nsX",
+ .desc = "dlmopen a preloaded DSO in the base & secondary NS into the base NS",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .handle_type = DSO,
+ .handle_ns = LM_ID_BASE,
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-shared2.c b/elf/tst-dlmopen-rtld-shared2.c
new file mode 100644
index 0000000000..b5bfe047e5
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared2.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-shared2.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-shared2.h b/elf/tst-dlmopen-rtld-shared2.h
new file mode 100644
index 0000000000..779ce62dfb
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared2.h
@@ -0,0 +1,66 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-shared:0:none--ns0",
+ .desc = "dlmopen as dlopen with RTLD_SHARED",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .loaded = { [0] = DSO|NEW },
+ .handle_ns = LM_ID_BASE,
+ .handle_type = DSO,
+ },
+ {
+ .name = "dlmopen-shared:X:ns0--ns0-nsXp",
+ .desc = "dlmopen into a new namespace with the target already in the base NS",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_NEWLM,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY|NEW }
+ },
+ {
+ .name = "dlmopen:0:ns0-nsXp--ns0-nsXp",
+ .desc = "dlmopen into base NS while proxy already in nsX",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ {
+ .name = "dlmopen-shared:0:ns0-nsXp--ns0-nsXp",
+ .desc = "dlmopen with RTLD_SHARED into base NS while proxy already in nsX",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ {
+ .name = "dlmopen:X:ns0-nsXp--ns0-nsXp",
+ .desc = "dlmopen into NS X while proxy already in nsX",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = EXPECTED_NS,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ {
+ .name = "dlmopen-shared:X:ns0-nsXp--ns0-nsXp",
+ .desc = "dlmopen with RTLD_SHARED into NS X while proxy already in nsX",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = EXPECTED_NS,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-shared3.c b/elf/tst-dlmopen-rtld-shared3.c
new file mode 100644
index 0000000000..f1a4c0fb8a
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared3.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-shared3.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-shared3.h b/elf/tst-dlmopen-rtld-shared3.h
new file mode 100644
index 0000000000..894626b1f4
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared3.h
@@ -0,0 +1,43 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen:X:none--nsX",
+ .desc = "dlmopen into nsX, no copies preloaded",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_NEWLM,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { },
+ .loaded = { [EXPECTED_NS] = DSO|NEW },
+ },
+ {
+ .name = "dlmopen:0:nsX--ns0-nsX",
+ .desc = "dlmopen into ns 0, copy already loaded in ns X",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO|NEW, [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen:X:ns0-nsX--nsX",
+ .desc = "dlmopen into ns X, copies already in ns 0 and ns X",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = EXPECTED_NS,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-shared:X:ns0-nsX--nsX",
+ .desc = "dlmopen RTLD_SHARED into nsX with a DSO already in NS0 and NSX",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = EXPECTED_NS,
+ .args.flags = RTLD_SHARED,
+ .failure = 1,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-shared4.c b/elf/tst-dlmopen-rtld-shared4.c
new file mode 100644
index 0000000000..395ced83c2
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared4.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-shared4.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-shared4.h b/elf/tst-dlmopen-rtld-shared4.h
new file mode 100644
index 0000000000..9b4d0f06e0
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared4.h
@@ -0,0 +1,14 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-shared:X:none--ns0-nsX",
+ .desc = "dlmopen a new proxy in nsX with no preexisting dso in ns0",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_NEWLM,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { },
+ .loaded = { [0] = DSO|NEW, [EXPECTED_NS] = PROXY|NEW },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-shared5.c b/elf/tst-dlmopen-rtld-shared5.c
new file mode 100644
index 0000000000..fe830b4162
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared5.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-shared5.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-shared5.h b/elf/tst-dlmopen-rtld-shared5.h
new file mode 100644
index 0000000000..13dca63cbd
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared5.h
@@ -0,0 +1,25 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-preload:X:none--nsX",
+ .desc = "preload a DSO into ns1 to prepare for other tests",
+ .is_prep_stage = 1,
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_NEWLM,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { },
+ .loaded = { [EXPECTED_NS] = DSO|NEW },
+ },
+ {
+ .name = "dlmopen-shared:0:nsX--nsX-ns0",
+ .desc = "dlmopen RTLD_SHARED into ns0 when preloaded into nsX",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO|NEW, [EXPECTED_NS] = DSO },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-shared6.c b/elf/tst-dlmopen-rtld-shared6.c
new file mode 100644
index 0000000000..989a37d78a
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared6.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-shared6.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-shared6.h b/elf/tst-dlmopen-rtld-shared6.h
new file mode 100644
index 0000000000..de41333619
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-shared6.h
@@ -0,0 +1,36 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-preload:X:none--nsX",
+ .desc = "preload a DSO into nsX to prepare for other tests",
+ .is_prep_stage = 1,
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = LM_ID_NEWLM,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { },
+ .loaded = { [EXPECTED_NS] = DSO|NEW },
+ },
+ {
+ .name = "dlmopen:X:nsX--nsX",
+ .desc = "dlmopen a dso in nsX while already loaded there",
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = EXPECTED_NS,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ .loaded = { [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-shared:X:nsX--nsX",
+ .desc = "dlmopen RTLD_SHARED a dso in nsX while already loaded there",
+ .failure = 1,
+ .args.dso_path = DSO_NORMAL,
+ .args.ns = EXPECTED_NS,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ .loaded = { [EXPECTED_NS] = DSO },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-unique1.c b/elf/tst-dlmopen-rtld-unique1.c
new file mode 100644
index 0000000000..f2240b5cd9
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique1.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-unique1.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-unique1.h b/elf/tst-dlmopen-rtld-unique1.h
new file mode 100644
index 0000000000..4b7390f772
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique1.h
@@ -0,0 +1,86 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-unique:0:none--ns0",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into ns0",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { },
+ .loaded = { [0] = DSO|NEW },
+ },
+ {
+ .name = "dlmopen-unique:0:ns0--ns0",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into ns0 while already present",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO },
+ },
+ {
+ .name = "dlmopen-unique-shared:0:ns0--ns0",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso into ns0 while already present",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO },
+ },
+ {
+ .name = "dlmopen-unique:X:ns0--nsX",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into nsX while present in ns0",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_NEWLM,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY|NEW },
+ },
+ {
+ .name = "dlmopen-unique:0:ns0-nsXp--ns0--nsXp",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso already in ns0 proxied in nsX",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ {
+ .name = "dlmopen-shared-unique:0:ns0-nsXp--ns0-nsXp",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso into ns0 already in ns0 and proxied in nsX",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ {
+ .name = "dlmopen-unique:0:ns0-nsXp--ns0-nsXp",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into ns0 already in ns0 and proxied in nsX",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = EXPECTED_NS,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ {
+ .name = "dlmopen-unique:0:ns0-nsXp--ns0-nsXp",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso into ns0 already in ns0 and proxied in nsX",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = EXPECTED_NS,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-unique2.c b/elf/tst-dlmopen-rtld-unique2.c
new file mode 100644
index 0000000000..5dd8c2678d
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique2.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-unique2.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-unique2.h b/elf/tst-dlmopen-rtld-unique2.h
new file mode 100644
index 0000000000..bf6871ab58
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique2.h
@@ -0,0 +1,25 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-shared-unique:0:none--ns0",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso in the base ns",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { },
+ .loaded = { [0] = DSO|NEW },
+ },
+ {
+ .name = "dlmopen-shared-unique:1:ns0--ns0-ns1p",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso into ns1 while present in ns0",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_NEWLM,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { [0] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = PROXY|NEW },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-unique3.c b/elf/tst-dlmopen-rtld-unique3.c
new file mode 100644
index 0000000000..237b3adcc1
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique3.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-unique3.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-unique3.h b/elf/tst-dlmopen-rtld-unique3.h
new file mode 100644
index 0000000000..139ade0d28
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique3.h
@@ -0,0 +1,13 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-unique:X:none--ns0-ns1p",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into nsX",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_NEWLM,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { },
+ .loaded = { [0] = DSO|NEW, [EXPECTED_NS] = PROXY|NEW },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-unique4.c b/elf/tst-dlmopen-rtld-unique4.c
new file mode 100644
index 0000000000..e13ca19fc7
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique4.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-unique4.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-unique4.h b/elf/tst-dlmopen-rtld-unique4.h
new file mode 100644
index 0000000000..1a9b93c2ac
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique4.h
@@ -0,0 +1,14 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-shared-unique:X:none--ns0-nsXp",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_NEWLM,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = PROXY,
+ .preloaded = { },
+ .loaded = { [0] = DSO|NEW, [EXPECTED_NS] = PROXY|NEW },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-unique5.c b/elf/tst-dlmopen-rtld-unique5.c
new file mode 100644
index 0000000000..014b10e45e
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique5.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-unique5.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-unique5.h b/elf/tst-dlmopen-rtld-unique5.h
new file mode 100644
index 0000000000..75dca65821
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique5.h
@@ -0,0 +1,58 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-isolate-unique:X:none--nsX",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into NSX with RTLD_ISOLATE",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_NEWLM,
+ .args.flags = RTLD_ISOLATE,
+ .handle_ns = EXPECTED_NS,
+ .free_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { },
+ .loaded = { [EXPECTED_NS] = DSO|NEW },
+ },
+ {
+ .name = "dlmopen-unique:0:nsX--ns0-nsX",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso already present in NS X",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO|NEW, [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-unique:0:ns0-nsX--ns0-nsX",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso already in the base NS and NS X",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-shared-unique:0:ns0-nsX--ns0-nsX",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso already in the base NS and NS X",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-shared-unique:X:ns0-nsX--ns0-nsX",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso already in the base NS and NS X into NS X",
+ .failure = 1,
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = EXPECTED_NS,
+ .args.flags = RTLD_SHARED,
+ .handle_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ },
+ };
diff --git a/elf/tst-dlmopen-rtld-unique6.c b/elf/tst-dlmopen-rtld-unique6.c
new file mode 100644
index 0000000000..c0df189d3f
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique6.c
@@ -0,0 +1,7 @@
+#include <dlfcn.h>
+#include "tst-dlmopen-main.h"
+
+#define EXPECTED_NS 1
+#include "tst-dlmopen-rtld-unique6.h"
+
+#include "tst-dlmopen-std-do-test.c"
diff --git a/elf/tst-dlmopen-rtld-unique6.h b/elf/tst-dlmopen-rtld-unique6.h
new file mode 100644
index 0000000000..062f1f2277
--- /dev/null
+++ b/elf/tst-dlmopen-rtld-unique6.h
@@ -0,0 +1,51 @@
+static dlmopen_test_spec dltest[] =
+ {
+ {
+ .name = "dlmopen-isolate-unique:1:none--ns1--prep",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into NS1 with RTLD_ISOLATE",
+ .is_prep_stage = 1,
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_NEWLM,
+ .args.flags = RTLD_ISOLATE,
+ .handle_ns = EXPECTED_NS,
+ .free_ns = EXPECTED_NS,
+ .handle_type = DSO,
+ .preloaded = { },
+ .loaded = { [EXPECTED_NS] = DSO|NEW },
+ },
+ {
+ .name = "dlmopen-unique:1:nsX--nsX--FAIL",
+ .desc = "dlmopen a DF_GNU_1_UNIQUE dso into NSX when already there",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = EXPECTED_NS,
+ .failure = 1,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-shared-unique:X:nsX--nsX--FAIL",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso into NSX when already there",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = EXPECTED_NS,
+ .args.flags = RTLD_SHARED,
+ .failure = 1,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-shared-unique:0:nsX--ns0-nsX",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso already present in NS X",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = LM_ID_BASE,
+ .handle_ns = 0,
+ .handle_type = DSO,
+ .preloaded = { [EXPECTED_NS] = DSO },
+ .loaded = { [0] = DSO|NEW, [EXPECTED_NS] = DSO },
+ },
+ {
+ .name = "dlmopen-shared-unique:X:ns0-nsX--ns0-nsX--FAIL",
+ .desc = "dlmopen RTLD_SHARED a DF_GNU_1_UNIQUE dso already in the base NS and NS 1",
+ .args.dso_path = DSO_UNIQUE,
+ .args.ns = EXPECTED_NS,
+ .failure = 1,
+ .preloaded = { [0] = DSO, [EXPECTED_NS] = DSO },
+ },
+ };
diff --git a/elf/tst-dlmopen-sharedmod-norm.c b/elf/tst-dlmopen-sharedmod-norm.c
new file mode 100644
index 0000000000..fd049903f4
--- /dev/null
+++ b/elf/tst-dlmopen-sharedmod-norm.c
@@ -0,0 +1,11 @@
+#include "tst-dlmopen-modules.h"
+
+dlmopen_testresult *rtld_shared_testfunc (void)
+{
+ static dlmopen_testresult result;
+
+ result.name = "norm";
+ result.free = free;
+
+ return &result;
+}
diff --git a/elf/tst-dlmopen-sharedmod-uniq.c b/elf/tst-dlmopen-sharedmod-uniq.c
new file mode 100644
index 0000000000..5c9701da41
--- /dev/null
+++ b/elf/tst-dlmopen-sharedmod-uniq.c
@@ -0,0 +1,11 @@
+#include "tst-dlmopen-modules.h"
+
+dlmopen_testresult *rtld_shared_testfunc (void)
+{
+ static dlmopen_testresult result;
+
+ result.name = "noop";
+ result.free = free;
+
+ return &result;
+}
diff --git a/elf/tst-dlmopen-std-do-test.c b/elf/tst-dlmopen-std-do-test.c
new file mode 100644
index 0000000000..9f1d3a3767
--- /dev/null
+++ b/elf/tst-dlmopen-std-do-test.c
@@ -0,0 +1,12 @@
+#include <array_length.h>
+
+static int
+do_test (void)
+{
+ for (int i = 0; i < array_length (dltest); i++)
+ if (!process_test_spec (&dltest[i]))
+ return 1;
+ return 0;
+}
+
+#include <support/test-driver.c>
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* [RFC][PATCH v10 7/7] Restore separate libc loading for the TLS/namespace storage test
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
` (5 preceding siblings ...)
2021-03-22 15:41 ` [RFC][PATCH v10 6/7] Add dlmopen / RTLD_SHARED tests Vivek Das Mohapatra
@ 2021-03-22 15:41 ` Vivek Das Mohapatra
2021-03-25 15:15 ` [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
2021-04-13 17:02 ` Vivek Das Mohapatra
8 siblings, 0 replies; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-22 15:41 UTC (permalink / raw)
To: libc-alpha
tst-tls-ie-dlmopen checks to see that new namespaces consume
TLS memory as expected: This does not happen when new namespaces
share the same libc instance (since TLS is allocated only when
a new libc instance insitialises its threading infrastructure).
Adding RTLD_ISOLATE to the dlmopen flags in the test restores
the old behaviour which allows the test to check what it
actually needs to.
---
elf/tst-tls-ie-dlmopen.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/elf/tst-tls-ie-dlmopen.c b/elf/tst-tls-ie-dlmopen.c
index a579d72d2d..e67017db2d 100644
--- a/elf/tst-tls-ie-dlmopen.c
+++ b/elf/tst-tls-ie-dlmopen.c
@@ -53,7 +53,7 @@ static void *
load_and_access (Lmid_t lmid, const char *mod, const char *func)
{
/* Load module with TLS. */
- void *p = xdlmopen (lmid, mod, RTLD_NOW);
+ void *p = xdlmopen (lmid, mod, RTLD_NOW|RTLD_ISOLATE);
/* Access the TLS variable to ensure it is allocated. */
void (*f) (void) = (void (*) (void))xdlsym (p, func);
f ();
@@ -95,7 +95,7 @@ do_test (void)
than 1024 bytes are available (exact number depends on TLS optimizations
and the libc TLS use). */
printf ("The next dlmopen should fail...\n");
- void *p = dlmopen (LM_ID_BASE, "tst-tls-ie-mod4.so", RTLD_NOW);
+ void *p = dlmopen (LM_ID_BASE, "tst-tls-ie-mod4.so", RTLD_NOW|RTLD_ISOLATE);
if (p != NULL)
FAIL_EXIT1 ("error: expected dlmopen to fail because there is "
"not enough surplus static TLS.\n");
--
2.20.1
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
` (6 preceding siblings ...)
2021-03-22 15:41 ` [RFC][PATCH v10 7/7] Restore separate libc loading for the TLS/namespace storage test Vivek Das Mohapatra
@ 2021-03-25 15:15 ` Vivek Das Mohapatra
2021-04-13 17:02 ` Vivek Das Mohapatra
8 siblings, 0 replies; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-03-25 15:15 UTC (permalink / raw)
To: libc-alpha
On Mon, 22 Mar 2021, Vivek Das Mohapatra via Libc-alpha wrote:
> This is a revision of a previous patchset that I posted here
> regarding https://sourceware.org/bugzilla/show_bug.cgi?id=22745
>
> The only changes from v9 are the rewording of a mislocated comment
> and the removal of © in favour of (C) in copyright comments.
Any further comments? I'm keeping the rebase up to date and making
sure the tests continue to pass so the branch doesn't bitrot.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
` (7 preceding siblings ...)
2021-03-25 15:15 ` [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
@ 2021-04-13 17:02 ` Vivek Das Mohapatra
2021-04-29 15:25 ` Vivek Das Mohapatra
8 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-04-13 17:02 UTC (permalink / raw)
To: libc-alpha
On Mon, 22 Mar 2021, Vivek Das Mohapatra via Libc-alpha wrote:
> This is a revision of a previous patchset that I posted here
> regarding https://sourceware.org/bugzilla/show_bug.cgi?id=22745
Pinging top keep this on the radar.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen
2021-04-13 17:02 ` Vivek Das Mohapatra
@ 2021-04-29 15:25 ` Vivek Das Mohapatra
2021-05-11 17:42 ` Vivek Das Mohapatra
0 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-04-29 15:25 UTC (permalink / raw)
To: libc-alpha
On Tue, 13 Apr 2021, Vivek Das Mohapatra via Libc-alpha wrote:
> On Mon, 22 Mar 2021, Vivek Das Mohapatra via Libc-alpha wrote:
>
>> This is a revision of a previous patchset that I posted here
>> regarding https://sourceware.org/bugzilla/show_bug.cgi?id=22745
Any chance this will be on the radar in the next couple of weeks?
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen
2021-04-29 15:25 ` Vivek Das Mohapatra
@ 2021-05-11 17:42 ` Vivek Das Mohapatra
2021-05-17 19:08 ` [PING][PATCH " Vivek Das Mohapatra
0 siblings, 1 reply; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-05-11 17:42 UTC (permalink / raw)
To: libc-alpha
On Thu, 29 Apr 2021, Vivek Das Mohapatra via Libc-alpha wrote:
>>> This is a revision of a previous patchset that I posted here
>>> regarding https://sourceware.org/bugzilla/show_bug.cgi?id=22745
Pinging to keep this on the radar.
^ permalink raw reply [flat|nested] 23+ messages in thread
* [PING][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen
2021-05-11 17:42 ` Vivek Das Mohapatra
@ 2021-05-17 19:08 ` Vivek Das Mohapatra
0 siblings, 0 replies; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-05-17 19:08 UTC (permalink / raw)
To: libc-alpha
On Tue, 11 May 2021, Vivek Das Mohapatra via Libc-alpha wrote:
> On Thu, 29 Apr 2021, Vivek Das Mohapatra via Libc-alpha wrote:
>
>>>> This is a revision of a previous patchset that I posted here
>>>> regarding https://sourceware.org/bugzilla/show_bug.cgi?id=22745
>
> Pinging to keep this on the radar.
Ibid.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 1/7] Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745)
2021-03-22 15:41 ` [RFC][PATCH v10 1/7] Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745) Vivek Das Mohapatra
@ 2021-05-28 14:53 ` Adhemerval Zanella
0 siblings, 0 replies; 23+ messages in thread
From: Adhemerval Zanella @ 2021-05-28 14:53 UTC (permalink / raw)
To: Vivek Das Mohapatra, libc-alpha
On 22/03/2021 12:41, Vivek Das Mohapatra via Libc-alpha wrote:
> Define a new flags section DT_GNU_FLAGS_1 (no more bits are available
> in DT_GNU_FLAGS).
>
> One flag is currently defined: DF_GNU_1_UNIQUE.
>
> libc and its companion DSOs (libpthread et al) should have this
> section and flag set.
LGTM, thanks.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> ---
> elf/elf.h | 7 ++++++-
> elf/get-dynamic-info.h | 12 ++++++++++++
> include/elf.h | 2 ++
> include/link.h | 1 +
> 4 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/elf/elf.h b/elf/elf.h
> index 2a62b98d4a..448c275d10 100644
> --- a/elf/elf.h
> +++ b/elf/elf.h
> @@ -896,6 +896,7 @@ typedef struct
> Dyn.d_un.d_val field of the Elf*_Dyn structure. This follows Sun's
> approach. */
> #define DT_VALRNGLO 0x6ffffd00
> +#define DT_GNU_FLAGS_1 0x6ffffdf4 /* GNU extension flags */
> #define DT_GNU_PRELINKED 0x6ffffdf5 /* Prelinking timestamp */
> #define DT_GNU_CONFLICTSZ 0x6ffffdf6 /* Size of conflict section */
> #define DT_GNU_LIBLISTSZ 0x6ffffdf7 /* Size of library list */
> @@ -910,7 +911,7 @@ typedef struct
> #define DT_SYMINENT 0x6ffffdff /* Entry size of syminfo */
> #define DT_VALRNGHI 0x6ffffdff
> #define DT_VALTAGIDX(tag) (DT_VALRNGHI - (tag)) /* Reverse order! */
> -#define DT_VALNUM 12
> +#define DT_VALNUM 13
>
> /* DT_* entries which fall between DT_ADDRRNGHI & DT_ADDRRNGLO use the
> Dyn.d_un.d_ptr field of the Elf*_Dyn structure.
> @@ -999,6 +1000,10 @@ typedef struct
> #define DF_1_WEAKFILTER 0x20000000
> #define DF_1_NOCOMMON 0x40000000
>
> +/* State flags selectable in the `d_un.d_val' element of the DT_GNU_FLAGS_1
> + entry in the dynamic section. */
> +#define DF_GNU_1_UNIQUE 0x00000001 /* Load max 1 copy of this DSO. */
> +
> /* Flags for the feature selection in DT_FEATURE_1. */
> #define DTF_1_PARINIT 0x00000001
> #define DTF_1_CONFEXP 0x00000002
> diff --git a/elf/get-dynamic-info.h b/elf/get-dynamic-info.h
> index d8ec32377d..8082d84ba1 100644
> --- a/elf/get-dynamic-info.h
> +++ b/elf/get-dynamic-info.h
> @@ -175,6 +175,18 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
> if (l->l_flags_1 & DF_1_NOW)
> info[DT_BIND_NOW] = info[VERSYMIDX (DT_FLAGS_1)];
> }
> + if (info[DT_VALTAGIDX (DT_GNU_FLAGS_1)
> + + DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM + DT_EXTRANUM] != NULL)
> + {
> + l->l_gnu_flags_1 = info[DT_VALTAGIDX (DT_GNU_FLAGS_1)
> + + DT_NUM + DT_THISPROCNUM
> + + DT_VERSIONTAGNUM + DT_EXTRANUM]->d_un.d_val;
> +
> + if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES)
> + && l->l_gnu_flags_1 & ~DT_GNU_1_SUPPORTED_MASK)
> + _dl_debug_printf ("\nWARNING: Unsupported flag value(s) of 0x%x in DT_GNU_FLAGS_1.\n",
> + l->l_gnu_flags_1 & ~DT_GNU_1_SUPPORTED_MASK);
> + }
> if (info[DT_RUNPATH] != NULL)
> /* If both RUNPATH and RPATH are given, the latter is ignored. */
> info[DT_RPATH] = NULL;
> diff --git a/include/elf.h b/include/elf.h
> index 14ed67ff67..5eee37c294 100644
> --- a/include/elf.h
> +++ b/include/elf.h
> @@ -25,5 +25,7 @@
> (DF_1_NOW | DF_1_NODELETE | DF_1_INITFIRST | DF_1_NOOPEN \
> | DF_1_ORIGIN | DF_1_NODEFLIB | DF_1_PIE)
>
> +#define DT_GNU_1_SUPPORTED_MASK DF_GNU_1_UNIQUE
> +
> #endif /* !_ISOMAC */
> #endif /* elf.h */
> diff --git a/include/link.h b/include/link.h
> index 4af16cb596..6ed35eb808 100644
> --- a/include/link.h
> +++ b/include/link.h
> @@ -283,6 +283,7 @@ struct link_map
> unsigned int l_used;
>
> /* Various flag words. */
> + ElfW(Word) l_gnu_flags_1;
> ElfW(Word) l_feature_1;
> ElfW(Word) l_flags_1;
> ElfW(Word) l_flags;
>
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 2/7] Abstract loaded-DSO search code into a helper function
2021-03-22 15:41 ` [RFC][PATCH v10 2/7] Abstract loaded-DSO search code into a helper function Vivek Das Mohapatra
@ 2021-05-28 14:53 ` Adhemerval Zanella
0 siblings, 0 replies; 23+ messages in thread
From: Adhemerval Zanella @ 2021-05-28 14:53 UTC (permalink / raw)
To: Vivek Das Mohapatra, libc-alpha
LGTM with the small fix below.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
On 22/03/2021 12:41, Vivek Das Mohapatra via Libc-alpha wrote:
> ---
> elf/dl-load.c | 38 ++++++++++++++++++++++++++++++++++++++
> sysdeps/generic/ldsodefs.h | 4 ++++
> 2 files changed, 42 insertions(+)
>
> diff --git a/elf/dl-load.c b/elf/dl-load.c
> index 2f760503c5..3ffb83cb6a 100644
> --- a/elf/dl-load.c
> +++ b/elf/dl-load.c
> @@ -2007,6 +2007,44 @@ open_path (const char *name, size_t namelen, int mode,
> return -1;
> }
>
> +/* Search for a shared object in a given namespace. */
> +struct link_map *
> +_dl_find_dso (const char *name, Lmid_t nsid)
> +{
> + struct link_map *l;
> +
> + for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
No implicit check:
for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
> + {
> + /* If the requested name matches the soname of a loaded object,
> + use that object. Elide this check for names that have not
> + yet been opened. */
> + if (__glibc_unlikely ((l->l_faked | l->l_removed) != 0))
> + continue;
> + if (!_dl_name_match_p (name, l))
> + {
> + const char *soname;
> +
> + if (__glibc_likely (l->l_soname_added)
> + || l->l_info[DT_SONAME] == NULL)
> + continue;
> +
> + soname = ((const char *) D_PTR (l, l_info[DT_STRTAB])
> + + l->l_info[DT_SONAME]->d_un.d_val);
> + if (strcmp (name, soname) != 0)
> + continue;
> +
> + /* We have a match on a new name -- cache it. */
> + add_name_to_object (l, soname);
> + l->l_soname_added = 1;
> + }
> +
> + /* We have a match. */
> + return l;
> + }
> +
> + return NULL;
> +}
> +
> /* Map in the shared object file NAME. */
>
> struct link_map *
Ok.
> diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
> index ea3f7a69d0..08791fbc0f 100644
> --- a/sysdeps/generic/ldsodefs.h
> +++ b/sysdeps/generic/ldsodefs.h
> @@ -1241,6 +1241,10 @@ extern void _dl_show_scope (struct link_map *new, int from)
> extern struct link_map *_dl_find_dso_for_object (const ElfW(Addr) addr);
> rtld_hidden_proto (_dl_find_dso_for_object)
>
> +extern struct link_map *_dl_find_dso (const char *name, Lmid_t nsid);
> +rtld_hidden_proto (_dl_find_dso)
> +
> +
> /* Initialization which is normally done by the dynamic linker. */
> extern void _dl_non_dynamic_init (void)
> attribute_hidden;
>
Ok.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 3/7] Use the new DSO finder helper function
2021-03-22 15:41 ` [RFC][PATCH v10 3/7] Use the new DSO finder " Vivek Das Mohapatra
@ 2021-05-28 14:53 ` Adhemerval Zanella
0 siblings, 0 replies; 23+ messages in thread
From: Adhemerval Zanella @ 2021-05-28 14:53 UTC (permalink / raw)
To: Vivek Das Mohapatra, libc-alpha
LGTM, thanks.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
On 22/03/2021 12:41, Vivek Das Mohapatra via Libc-alpha wrote:
> ---
> elf/dl-load.c | 28 +++-------------------------
> 1 file changed, 3 insertions(+), 25 deletions(-)
>
> diff --git a/elf/dl-load.c b/elf/dl-load.c
> index 3ffb83cb6a..f2dbe45703 100644
> --- a/elf/dl-load.c
> +++ b/elf/dl-load.c
> @@ -2062,32 +2062,10 @@ _dl_map_object (struct link_map *loader, const char *name,
> assert (nsid < GL(dl_nns));
>
> /* Look for this name among those already loaded. */
> - for (l = GL(dl_ns)[nsid]._ns_loaded; l; l = l->l_next)
> + l = _dl_find_dso (name, nsid);
> +
> + if (l != NULL)
> {
> - /* If the requested name matches the soname of a loaded object,
> - use that object. Elide this check for names that have not
> - yet been opened. */
> - if (__glibc_unlikely ((l->l_faked | l->l_removed) != 0))
> - continue;
> - if (!_dl_name_match_p (name, l))
> - {
> - const char *soname;
> -
> - if (__glibc_likely (l->l_soname_added)
> - || l->l_info[DT_SONAME] == NULL)
> - continue;
> -
> - soname = ((const char *) D_PTR (l, l_info[DT_STRTAB])
> - + l->l_info[DT_SONAME]->d_un.d_val);
> - if (strcmp (name, soname) != 0)
> - continue;
> -
> - /* We have a match on a new name -- cache it. */
> - add_name_to_object (l, soname);
> - l->l_soname_added = 1;
> - }
> -
> - /* We have a match. */
> return l;
> }
>
>
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745)
2021-03-22 15:41 ` [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745) Vivek Das Mohapatra
@ 2021-05-28 14:53 ` Adhemerval Zanella
2021-05-28 16:59 ` Adhemerval Zanella
2021-05-28 17:18 ` Andreas Schwab
0 siblings, 2 replies; 23+ messages in thread
From: Adhemerval Zanella @ 2021-05-28 14:53 UTC (permalink / raw)
To: Vivek Das Mohapatra, libc-alpha
On 22/03/2021 12:41, Vivek Das Mohapatra via Libc-alpha wrote:
> libc.so, libpthread.so etc should have the new unique-dso-by-default
> flag set to allow dlmopen to work better (libc et al instance shared
> by default when DSOs dlmopened into a new namespace).
Some comments below.
> ---
> Makeconfig | 3 +++
> Makerules | 19 +++++++++++++-
> config.make.in | 1 +
> configure | 54 ++++++++++++++++++++++++++++++++++++---
> configure.ac | 32 +++++++++++++++++++++--
> dynamic-notes.c | 4 +++
> elf/Makefile | 3 +++
> extra-lib.mk | 3 +++
> htl/Makefile | 3 +++
> iconvdata/Makefile | 3 +++
> iconvdata/extra-module.mk | 4 +++
> nptl/Makefile | 3 +++
> 12 files changed, 126 insertions(+), 6 deletions(-)
> create mode 100644 dynamic-notes.c
>
> diff --git a/Makeconfig b/Makeconfig
> index 01f8638c2e..7e1116163f 100644
> --- a/Makeconfig
> +++ b/Makeconfig
> @@ -398,6 +398,9 @@ LDFLAGS-lib.so += -Wl,-z,now
> # Extra flags for dynamically linked non-test main programs.
> link-extra-flags += -Wl,-z,now
> endif
> +ifeq ($(ld-zunique),yes)
> +LDFLAGS-lib.so += -Wl,-z,unique
> +endif
>
> # Command to run after every final link (executable or shared object).
> # This is invoked with $(call after-link,...), so it should operate on
Ok.
> diff --git a/Makerules b/Makerules
> index ca9885436e..d54767f3a6 100644
> --- a/Makerules
> +++ b/Makerules
> @@ -581,7 +581,8 @@ $(common-objpfx)shlib.lds: $(common-objpfx)config.make $(..)Makerules
> PROVIDE(__start___libc_IO_vtables = .);\
> __libc_IO_vtables : { *(__libc_IO_vtables) }\
> PROVIDE(__stop___libc_IO_vtables = .);\
> - /DISCARD/ : { *(.gnu.glibc-stub.*) }@'
> + /DISCARD/ : { *(.gnu.glibc-stub.*) }@' \
> + -e 's/^.*\*(\.dynamic).*$$/ .dynamic : { *dynamic-notes.os(.dynamic) *(.dynamic) }/'
> test -s $@T
> mv -f $@T $@
> common-generated += shlib.lds
Ok.
> @@ -636,6 +637,17 @@ build-shlib-objlist = $(build-module-helper-objlist) \
> # Also omits crti.o and crtn.o, which we do not want
> # since we define our own `.init' section specially.
> LDFLAGS-c.so = -nostdlib -nostartfiles
> +
> +# The stub dynamic-notes.os should not have weak/undefined symbol magic in it.
> +# It's not really part of the internals, rather it is a vector for linker magic
> +# which we need when the linker isn't new enough:
> +%/dynamic-notes.os: CPPFLAGS += -UMODULE_NAME
> +%/dynamic-notes.os: dynamic-notes.c
> +
> +ifeq ($(ld-zunique),yes)
> +LDFLAGS-c.so += -Wl,-z,unique
> +endif
> +
> # But we still want to link libc.so against $(libc.so-gnulib).
> LDLIBS-c.so += $(libc.so-gnulib)
> # Give libc.so an entry point and make it directly runnable itself.
> @@ -706,6 +718,11 @@ $(common-objpfx)linkobj/libc.so: $(common-objpfx)linkobj/libc_pic.a \
> $(build-shlib)
> $(call after-link,$@)
>
> +ifneq ($(ld-zunique),yes)
> +$(common-objpfx)libc.so: $(common-objpfx)dynamic-notes.os
> +$(common-objpfx)linkobj/libc.so: $(common-objpfx)dynamic-notes.os
> +endif
> +
> ifeq ($(build-shared),yes)
> $(common-objpfx)libc.so: $(common-objpfx)libc.map
> endif
> diff --git a/config.make.in b/config.make.in
> index 7f47f0caa4..c2d818681b 100644
> --- a/config.make.in
> +++ b/config.make.in
> @@ -72,6 +72,7 @@ have-cc-with-libunwind = @libc_cv_cc_with_libunwind@
> fno-unit-at-a-time = @fno_unit_at_a_time@
> bind-now = @bindnow@
> have-hash-style = @libc_cv_hashstyle@
> +ld-zunique = @ld_zunique@
> use-default-link = @use_default_link@
> have-cxx-thread_local = @libc_cv_cxx_thread_local@
> have-loop-to-function = @libc_cv_cc_loop_to_function@
> diff --git a/configure b/configure
> index 37cef37413..1040130d6c 100755
> --- a/configure
> +++ b/configure
> @@ -685,6 +685,7 @@ hardcoded_path_in_tests
> enable_timezone_tools
> extra_nonshared_cflags
> use_default_link
> +ld_zunique
> sysheaders
> ac_ct_CXX
> CXXFLAGS
> @@ -731,6 +732,7 @@ infodir
> docdir
> oldincludedir
> includedir
> +runstatedir
> localstatedir
> sharedstatedir
> sysconfdir
Although it being autogenerated by autoconf, the runstatedir should be added
in a different patch. So I think it should be manually removed for now.
> @@ -843,6 +845,7 @@ datadir='${datarootdir}'
> sysconfdir='${prefix}/etc'
> sharedstatedir='${prefix}/com'
> localstatedir='${prefix}/var'
> +runstatedir='${localstatedir}/run'
> includedir='${prefix}/include'
> oldincludedir='/usr/include'
> docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
> @@ -1095,6 +1098,15 @@ do
> | -silent | --silent | --silen | --sile | --sil)
> silent=yes ;;
>
> + -runstatedir | --runstatedir | --runstatedi | --runstated \
> + | --runstate | --runstat | --runsta | --runst | --runs \
> + | --run | --ru | --r)
> + ac_prev=runstatedir ;;
> + -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
> + | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
> + | --run=* | --ru=* | --r=*)
> + runstatedir=$ac_optarg ;;
> +
> -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
> ac_prev=sbindir ;;
> -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
Ditto.
> @@ -1232,7 +1244,7 @@ fi
> for ac_var in exec_prefix prefix bindir sbindir libexecdir datarootdir \
> datadir sysconfdir sharedstatedir localstatedir includedir \
> oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
> - libdir localedir mandir
> + libdir localedir mandir runstatedir
> do
> eval ac_val=\$$ac_var
> # Remove trailing slashes.
> @@ -1385,6 +1397,7 @@ Fine tuning of the installation directories:
> --sysconfdir=DIR read-only single-machine data [PREFIX/etc]
> --sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
> --localstatedir=DIR modifiable single-machine data [PREFIX/var]
> + --runstatedir=DIR modifiable per-process data [LOCALSTATEDIR/run]
> --libdir=DIR object code libraries [EPREFIX/lib]
> --includedir=DIR C header files [PREFIX/include]
> --oldincludedir=DIR C header files for non-gcc [/usr/include]
> @@ -3331,6 +3344,7 @@ fi
>
>
>
> +
> # Check whether --with-default-link was given.
> if test "${with_default_link+set}" = set; then :
> withval=$with_default_link; use_default_link=$withval
> @@ -5976,6 +5990,34 @@ fi
> $as_echo "$libc_cv_hashstyle" >&6; }
>
>
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker DT_GNU_FLAGS_1/ DF_GNU_1_UNIQUE support" >&5
> +$as_echo_n "checking for linker DT_GNU_FLAGS_1/ DF_GNU_1_UNIQUE support... " >&6; }
> +if ${libc_cv_ld_zunique+:} false; then :
> + $as_echo_n "(cached) " >&6
> +else
> + cat > conftest.ld.c <<\EOF
> +int x (void) { return 0; }
> +EOF
> +libc_cv_ld_zunique=no;
> +if { ac_try='${CC-cc} -Wl,--fatal-warnings -Wl,-z,unique -shared -o conftest.ld.so conftest.ld.c'
> + { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
> + (eval $ac_try) 2>&5
> + ac_status=$?
> + $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
> + test $ac_status = 0; }; }
> +then
> + libc_cv_ld_zunique=yes
> +else
> + echo >&5 "\
> +${CC-cc} does not support -Wl,-z,unique from:
> +$ac_try"
> +fi;
> +ld_zunique=$libc_cv_ld_zunique
> +rm -f conftest*
> +fi
> +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ld_zunique" >&5
> +$as_echo "$libc_cv_ld_zunique" >&6; }
> +
> # The linker's default -shared behavior is good enough if it
> # does these things that our custom linker scripts ensure that
> # all allocated NOTE sections come first.
> @@ -6021,10 +6063,16 @@ EOF
> esac
> shift 2
> done
> - case "$libc_seen_a$libc_seen_b" in
> - yesyes)
> + case "$libc_seen_a$libc_seen_b$libc_cv_ld_zunique" in
> + yesyesyes)
> libc_cv_use_default_link=yes
> ;;
> + yesyesno)
> + echo >&5 "\
> +shared layout from:
> +$ac_try
> +is OK but -Wl,-z,unique is unsupported anyway"
> + ;;
> *)
> echo >&5 "\
> $libc_seen_a$libc_seen_b from:
> diff --git a/configure.ac b/configure.ac
> index 16b15b6f90..178874aa12 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -148,6 +148,7 @@ AC_ARG_WITH([headers],
> [sysheaders=''])
> AC_SUBST(sysheaders)
>
> +AC_SUBST(ld_zunique)
Move it to where it is actually set below.
> AC_SUBST(use_default_link)
> AC_ARG_WITH([default-link],
> AS_HELP_STRING([--with-default-link],
> @@ -1352,6 +1353,27 @@ fi
> rm -f conftest*])
> AC_SUBST(libc_cv_hashstyle)
>
> +AC_CACHE_CHECK([for linker DT_GNU_FLAGS_1/ DF_GNU_1_UNIQUE support],
> + libc_cv_ld_zunique, [dnl
> +cat > conftest.ld.c <<\EOF
> +int x (void) { return 0; }
> +EOF
> +libc_cv_ld_zunique=no;
Move it to the else below, as other tests do.
> +dnl FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
> +dnl THIS IS DELIBERATELY WRONG SO WE CAN TEST BUILDING WITH A TOO-OLD LINKER
> +dnl FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME
I think this is leftover from development.
> +if AC_TRY_COMMAND([dnl
> +${CC-cc} -Wl,--fatal-warnings -Wl,-z,unique -shared -o conftest.ld.so conftest.ld.c])
> +then
> + libc_cv_ld_zunique=yes
> +else
> + echo >&AS_MESSAGE_LOG_FD "\
> +${CC-cc} does not support -Wl,-z,unique from:
> +$ac_try"
> +fi;
> +ld_zunique=$libc_cv_ld_zunique
> +rm -f conftest*])
> +
> # The linker's default -shared behavior is good enough if it
> # does these things that our custom linker scripts ensure that
> # all allocated NOTE sections come first.
> @@ -1390,10 +1412,16 @@ EOF
> esac
> shift 2
> done
> - case "$libc_seen_a$libc_seen_b" in
> - yesyes)
> + case "$libc_seen_a$libc_seen_b$libc_cv_ld_zunique" in
> + yesyesyes)
> libc_cv_use_default_link=yes
> ;;
> + yesyesno)
> + echo >&AS_MESSAGE_LOG_FD "\
> +shared layout from:
> +$ac_try
> +is OK but -Wl,-z,unique is unsupported anyway"
> + ;;
> *)
> echo >&AS_MESSAGE_LOG_FD "\
> $libc_seen_a$libc_seen_b from:
I am not sure this message here add much extra diagnosit .
> diff --git a/dynamic-notes.c b/dynamic-notes.c
> new file mode 100644
> index 0000000000..d0b487e970
> --- /dev/null
> +++ b/dynamic-notes.c
> @@ -0,0 +1,4 @@
> +#include <link.h>
> +
> +const ElfW(Dyn) __dynamic_note __attribute__ ((section (".dynamic"))) =
> + { .d_tag = DT_GNU_FLAGS_1, .d_un.d_val = DF_GNU_1_UNIQUE };
I think we should put the note on the elf directory, even though it
is used on mutiples modules.
> diff --git a/elf/Makefile b/elf/Makefile
> index 3b8e13e066..22f2a87fcb 100644
> --- a/elf/Makefile
> +++ b/elf/Makefile
> @@ -102,6 +102,9 @@ endif
>
> ifeq (yes,$(build-shared))
> extra-objs = $(all-rtld-routines:%=%.os) sofini.os interp.os
> +ifneq (yes,$(ld-zunique))
> +extra-objs += ../dynamic-notes.os
> +endif
> generated += librtld.os dl-allobjs.os ld.so ldd
> install-others = $(inst_rtlddir)/$(rtld-installed-name)
> install-bin-script = ldd
Ok, although I think this implementation should be moved to elf/
> diff --git a/extra-lib.mk b/extra-lib.mk
> index 72f8d2e1df..4e4a447d5e 100644
> --- a/extra-lib.mk
> +++ b/extra-lib.mk
> @@ -101,6 +101,9 @@ $(objpfx)$(lib).so: $(firstword $($(lib)-map) \
> $(addprefix $(common-objpfx), \
> $(filter $(lib).map, \
> $(version-maps))))
> +ifneq ($(ld-zunique),yes)
> +$(objpfx)$(lib).so: $(common-objpfx)dynamic-notes.os
> +endif
> endif
>
> endif
Ditto.
> diff --git a/htl/Makefile b/htl/Makefile
> index 895a6f777c..65ddd202a1 100644
> --- a/htl/Makefile
> +++ b/htl/Makefile
> @@ -205,6 +205,9 @@ libc-link.so = $(common-objpfx)libc.so
>
> extra-B-pthread.so = -B$(common-objpfx)htl/
> LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst
> +ifeq ($(ld-zunique),yes)
> +LDFLAGS-pthread.so += -Wl,-z,unique
> +endif
>
> include ../Rules
>
Ok.
> diff --git a/iconvdata/Makefile b/iconvdata/Makefile
> index 55c527a5f7..2fe2404ade 100644
> --- a/iconvdata/Makefile
> +++ b/iconvdata/Makefile
> @@ -67,6 +67,9 @@ modules := ISO8859-1 ISO8859-2 ISO8859-3 ISO8859-4 ISO8859-5 \
> ifeq ($(bind-now),yes)
> LDFLAGS.so += -Wl,-z,now
> endif
> +ifeq ($(ld-zunique),yes)
> +LDFLAGS.so += -Wl,-z,unique
> +endif
>
> modules.so := $(addsuffix .so, $(modules))
>
Ok, it does make sense to make the iconvdata unique.
> diff --git a/iconvdata/extra-module.mk b/iconvdata/extra-module.mk
> index ecaf507624..4d81358f19 100644
> --- a/iconvdata/extra-module.mk
> +++ b/iconvdata/extra-module.mk
> @@ -7,6 +7,10 @@ $(objpfx)$(mod).so: $(addprefix $(objpfx),$(addsuffix .os,$($(mod)-routines)))\
> $(shlib-lds) $(link-libc-deps)
> $(build-module-asneeded)
>
> +ifneq ($(ld-zunique),yes)
> +$(objpfx)$(mod).so: $(common-objpfx)dynamic-notes.os
> +endif
> +
> ifneq (,$(extra-modules-left))
> include extra-module.mk
> endif
Ok.
> diff --git a/nptl/Makefile b/nptl/Makefile
> index b1948cc47a..dedfe389c0 100644
> --- a/nptl/Makefile
> +++ b/nptl/Makefile
> @@ -396,6 +396,9 @@ tests-printers-libs := $(static-thread-library)
> endif
>
> LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst
> +ifeq ($(ld-zunique),yes)
> +LDFLAGS-pthread.so += -Wl,-z,unique
> +endif
>
> tests += tst-cancelx7 tst-cancelx17 tst-cleanupx4
>
>
With the libpthread symbol move I think there is no need to add 'unique'
on libpthread.so anylonger.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745)
2021-05-28 14:53 ` Adhemerval Zanella
@ 2021-05-28 16:59 ` Adhemerval Zanella
2021-05-28 17:18 ` Andreas Schwab
1 sibling, 0 replies; 23+ messages in thread
From: Adhemerval Zanella @ 2021-05-28 16:59 UTC (permalink / raw)
To: Vivek Das Mohapatra, libc-alpha
> On 22/03/2021 12:41, Vivek Das Mohapatra via Libc-alpha wrote:
>> @@ -636,6 +637,17 @@ build-shlib-objlist = $(build-module-helper-objlist) \
>> # Also omits crti.o and crtn.o, which we do not want
>> # since we define our own `.init' section specially.
>> LDFLAGS-c.so = -nostdlib -nostartfiles
>> +
>> +# The stub dynamic-notes.os should not have weak/undefined symbol magic in it.
>> +# It's not really part of the internals, rather it is a vector for linker magic
>> +# which we need when the linker isn't new enough:
>> +%/dynamic-notes.os: CPPFLAGS += -UMODULE_NAME
Although it seems correct to built it without defining MODULE_NAME,
I wonder if there is a simpler way to define as MODULE_NAME=nonlib
(it seems be more correct than not defining any module name).
>> +%/dynamic-notes.os: dynamic-notes.c
I think this is not really required.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745)
2021-05-28 14:53 ` Adhemerval Zanella
2021-05-28 16:59 ` Adhemerval Zanella
@ 2021-05-28 17:18 ` Andreas Schwab
1 sibling, 0 replies; 23+ messages in thread
From: Andreas Schwab @ 2021-05-28 17:18 UTC (permalink / raw)
To: Adhemerval Zanella via Libc-alpha
On Mai 28 2021, Adhemerval Zanella via Libc-alpha wrote:
> Although it being autogenerated by autoconf, the runstatedir should be added
> in a different patch. So I think it should be manually removed for now.
That is the sign of a patched autoconf. Only use a vanilla version.
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] 23+ messages in thread
* Re: [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag (bug 22745)
2021-03-22 15:41 ` [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag " Vivek Das Mohapatra
@ 2021-05-28 17:32 ` Adhemerval Zanella
2021-05-28 18:02 ` Adhemerval Zanella
2021-05-28 23:22 ` Vivek Das Mohapatra
0 siblings, 2 replies; 23+ messages in thread
From: Adhemerval Zanella @ 2021-05-28 17:32 UTC (permalink / raw)
To: Vivek Das Mohapatra, libc-alpha
On 22/03/2021 12:41, Vivek Das Mohapatra via Libc-alpha wrote:
> This flag will instruct dlmopen to create a shared object present
> in the main namespace and accessible from the selected namespace
> when supplied in the MODE argument.
>
> include/link.h: Update the link_map struct to allow proxies
>
> We already have an l_real pointer, used for a similar purpose by
> the linker for copies of ld.so in secondary namespaces. Update its
> documentation and add a bitfield to indicate when link_map entry
> is a proxy.
>
> elf/dl-object.c: Implement a helper function to proxy link_map entries
>
> Provides the minimal functionality needed to take an existing
> link_map entry and create a proxy for it in the specified namespace.
>
> elf/dl-load.c, elf/dl-open.c: Implement RTLD_SHARED dlmopen proxying
>
> This uses the new infrastructure to implement RTLD_SHARED object
> proxying via dlmopen: Instead of opening the specified object in
> the requested namespace we open it in the main namespace (if it
> is not already present there) and proxy it to the destination.
>
> The following rules apply:
>
> If a proxy of the object is already present in the requested namespace,
> we simply return it (with an incremented direct-open count).
>
> If the object is already present in the requested namespace, a dl
> error is signalled, since we cannot satisfy the user's request.
>
> Proxies are never created in the main namespace: RTLD_SHARED has no
> effect when the requested namespace is LM_ID_BASE.
>
> elf/dl-fini.c: Handle proxy link_maps in the shutdown path (bug 22745)
>
> When cleaning up before exit we should not call destructors or
> otherwise free [most of] the contents of proxied link_map entries
> since they share [most of] their contents with the LM_ID_BASE
> objects to which they point.
>
> elf/dl-init.c: Skip proxy link_map entries in dl init path
>
> Proxies should not trigger calls to DT_INIT constructors since they're
> just shims that point to the real, already loaded and initialised, objects.
>
> elf/dl-open.c: Skip libc init if namespace has no libc map
>
> Secondary namespaces which share their libc mapping with the main
> namespace cannot (and should not) have _dl_call_libc_early_init
> called for them by dl_open_worker.
>
> elf/dl-open.c: When creating a proxy check NS 0 libc map
>
> The libc_already_loaded check normally considers the libc_map entry
> in GL(dl_ns)[args->nsid].libc_map.
>
> This is not correct for proxies, which use the libc_map from
> the default namespace (as proxies are dummy entries that point
> to the base namespace via their l_real members).
>
> elf/dl-load.c, dl-open.c: Compare DSOs by file ID & check DF_GNU_1_UNIQUE
>
> If _dl_map_object_from_fd finds that a DSO it was asked to
> load into a non-base namespace is already loaded (into the
> main namespace) and is flagged DF_GNU_1_UNIQUE then it should
> return that DSO's link map entry.
>
> In such cases _dl_open_worker must notice that this has
> happened and continue down the link map proxy generation
> path instead of normal link map entry preparation.
>
> elf/dl-load.c: error if RTLD_SHARED = DF_GNU_1_UNIQUE semantics violated
>
> elf/dl-open.c: Use search helper to find preloaded DT_GNU_UNIQUE DSOs
>
> If a DSO already exists (with the same name) in the base namespace
> and it is flagged DT_GNU_UNIQUE then we should behave as if a proxy
> had been requested.
>
> elf/dl-load.c: When loading DSOs in other namespaces check DT_GNU_UNIQUE
>
> If a DSO has not already been loaded and the target is not the main
> namespace then we must check to see if it's been DT_GNU_UNIQUE tagged
> and load it into the main namespace instead.
>
> dl_open_worker has alread been modified to notice the discrepancy
> between the request and the result in such cases, and will set up
> a proxy in the target namespace.
>
> elf/dl-load.c: Suppress audit calls when a (new) namespace is empty
>
> When preparing an RTLD_SHARED proxy in a new namespace
> it is possible for the target namespace to be empty:
>
> This can happen for RTLD_SHARED + LM_ID_NEWLM.
>
> The audit infrastructure should not be invoked at this
> point (as there's nothing there to audit yet).
>
> bits/dlfcn.h, elf/dl-load.c, elf/dl-open.c, elf/rtld.c,
> sysdeps/mips/bits/dlfcn.h:
> Suppress inter-namespace DSO sharing for audit libraries
>
> Audit libraries should not participate in DSO sharing: In
> particular libraries tagged with DF_GNU_1_UNIQUE should not
> be shared between the audit namespace and any others - they
> should get their own copy.
>
> This is signalled to the loader code by passing the RTLD_ISOLATE
> flag from the relevant entry point in the dl modes argument.
>
> elf/dl-sym.c: dlsym, dlvsym must be able to resolve symbols via proxies
With this patch I am seeing some regression with binutils with and
without -z unique support:
FAIL: elf/tst-dlmopen-dlerror
FAIL: elf/tst-tls-ie-dlmopen
$ ./debugglibc.sh -- elf/tst-dlmopen-dlerror --direct
[...]
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7fdf44f in _dl_open (file=<optimized out>, mode=<optimized out>, caller_dlopen=0x7ffff7dd1383, nsid=-2, argc=2, argv=0x7fffffffd5c0, env=0x7fffffffd5d8) at dl-open.c:995
995 GL(dl_ns)[nsid].libc_map = NULL;
(gdb) bt
#0 0x00007ffff7fdf44f in _dl_open (file=<optimized out>, mode=<optimized out>, caller_dlopen=0x7ffff7dd1383, nsid=-2, argc=2, argv=0x7fffffffd5c0, env=0x7fffffffd5d8) at dl-open.c:995
#1 0x00007ffff7fbf288 in dlopen_doit (a=a@entry=0x7fffffffcb70) at dlopen.c:66
#2 0x00007ffff7f0f769 in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffcad0, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:208
#3 0x00007ffff7f0f80f in __GI__dl_catch_error (objname=0x7fffffffcb30, errstring=0x7fffffffcb38, mallocedp=0x7fffffffcb2f, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:227
#4 0x00007ffff7fbf776 in _dlerror_run (operate=operate@entry=0x7ffff7fbf230 <dlopen_doit>, args=args@entry=0x7fffffffcb70) at dlerror.c:142
#5 0x00007ffff7fbf306 in __dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:87
#6 0x00007ffff7dd1383 in ?? ()
#7 0x000000000000002b in ?? ()
#8 0x00007fffffffcbd0 in ?? ()
#9 0x00007ffff7dd1370 in ?? ()
#10 0x0000000000402595 in do_test () at tst-dlmopen-dlerror.c:43
#11 0x0000000000402d75 in support_test_main (argc=1, argc@entry=2, argv=0x7fffffffd5c8, argv@entry=0x7fffffffd5c0, config=config@entry=0x7fffffffd450) at support_test_main.c:403
#12 0x0000000000402385 in main (argc=argc@entry=2, argv=argv@entry=0x7fffffffd5c0) at ../support/test-driver.c:168
#13 0x00007ffff7dff407 in __libc_start_call_main (main=main@entry=0x402350 <main>, argc=argc@entry=2, argv=argv@entry=0x7fffffffd5c0) at ../sysdeps/nptl/libc_start_call_main.h:58
#14 0x00007ffff7dff4b8 in __libc_start_main_impl (main=0x402350 <main>, argc=2, argv=0x7fffffffd5c0, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd5b8)
at ../csu/libc-start.c:411
#15 0x0000000000402411 in _start () at ../sysdeps/x86_64/start.S:116
$ ./debugglibc.sh -- elf/tst-dlmopen-dlerror --direct
[...]
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7fdf44f in _dl_open (file=<optimized out>, mode=<optimized out>, caller_dlopen=0x7ffff7dd1383, nsid=-2, argc=2, argv=0x7fffffffd5c0, env=0x7fffffffd5d8) at dl-open.c:995
995 GL(dl_ns)[nsid].libc_map = NULL;
(gdb) bt
#0 0x00007ffff7fdf44f in _dl_open (file=<optimized out>, mode=<optimized out>, caller_dlopen=0x7ffff7dd1383, nsid=-2, argc=2, argv=0x7fffffffd5c0, env=0x7fffffffd5d8) at dl-open.c:995
#1 0x00007ffff7fbf288 in dlopen_doit (a=a@entry=0x7fffffffcb70) at dlopen.c:66
#2 0x00007ffff7f0f769 in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffcad0, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:208
#3 0x00007ffff7f0f80f in __GI__dl_catch_error (objname=0x7fffffffcb30, errstring=0x7fffffffcb38, mallocedp=0x7fffffffcb2f, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:227
#4 0x00007ffff7fbf776 in _dlerror_run (operate=operate@entry=0x7ffff7fbf230 <dlopen_doit>, args=args@entry=0x7fffffffcb70) at dlerror.c:142
#5 0x00007ffff7fbf306 in __dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:87
#6 0x00007ffff7dd1383 in ?? ()
#7 0x000000000000002b in ?? ()
#8 0x00007fffffffcbd0 in ?? ()
#9 0x00007ffff7dd1370 in ?? ()
#10 0x0000000000402595 in do_test () at tst-dlmopen-dlerror.c:43
#11 0x0000000000402d75 in support_test_main (argc=1, argc@entry=2, argv=0x7fffffffd5c8, argv@entry=0x7fffffffd5c0, config=config@entry=0x7fffffffd450) at support_test_main.c:403
#12 0x0000000000402385 in main (argc=argc@entry=2, argv=argv@entry=0x7fffffffd5c0) at ../support/test-driver.c:168
#13 0x00007ffff7dff407 in __libc_start_call_main (main=main@entry=0x402350 <main>, argc=argc@entry=2, argv=argv@entry=0x7fffffffd5c0) at ../sysdeps/nptl/libc_start_call_main.h:58
#14 0x00007ffff7dff4b8 in __libc_start_main_impl (main=0x402350 <main>, argc=2, argv=0x7fffffffd5c0, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd5b8)
at ../csu/libc-start.c:411
#15 0x0000000000402411 in _start () at ../sysdeps/x86_64/start.S:116
Could you check if this is something related to recent changes?
I will stop the review process until we sort these out.
> ---
> bits/dlfcn.h | 10 ++
> elf/dl-close.c | 43 +++++----
> elf/dl-fini.c | 6 +-
> elf/dl-init.c | 4 +-
> elf/dl-load.c | 181 +++++++++++++++++++++++++++++++++----
> elf/dl-object.c | 78 ++++++++++++++++
> elf/dl-open.c | 109 +++++++++++++++++++++-
> elf/dl-sym.c | 14 +++
> elf/rtld.c | 2 +-
> include/link.h | 6 +-
> sysdeps/generic/ldsodefs.h | 5 +
> sysdeps/mips/bits/dlfcn.h | 10 ++
> 12 files changed, 423 insertions(+), 45 deletions(-)
>
> diff --git a/bits/dlfcn.h b/bits/dlfcn.h
> index f3bc63e958..1366cb3546 100644
> --- a/bits/dlfcn.h
> +++ b/bits/dlfcn.h
> @@ -32,6 +32,16 @@
> visible as if the object were linked directly into the program. */
> #define RTLD_GLOBAL 0x00100
>
> +/* If the following bit is set in the MODE argument to dlmopen
> + then the target object is loaded into the main namespace (if
> + it is not already there) and a shallow copy (proxy) is placed
> + in the target namespace: This allows multiple namespaces to
> + share a single instance of a DSO. */
> +#define RTLD_SHARED 0x00080
> +
> +/* Suppress RTLD_SHARED and/or DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE */
> +#define RTLD_ISOLATE 0x00040
> +
> /* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
> The implementation does this by default and so we can define the
> value to zero. */
> diff --git a/elf/dl-close.c b/elf/dl-close.c
> index c51becd06b..a0432b884d 100644
> --- a/elf/dl-close.c
> +++ b/elf/dl-close.c
> @@ -283,8 +283,9 @@ _dl_close_worker (struct link_map *map, bool force)
>
> /* Call its termination function. Do not do it for
> half-cooked objects. Temporarily disable exception
> - handling, so that errors are fatal. */
> - if (imap->l_init_called)
> + handling, so that errors are fatal.
> + Proxies should never have this flag set, but we double check. */
> + if (imap->l_init_called && !imap->l_proxy)
> {
> /* When debugging print a message first. */
> if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS,
> @@ -360,7 +361,9 @@ _dl_close_worker (struct link_map *map, bool force)
> one for the terminating NULL pointer. */
> size_t remain = (new_list != NULL) + 1;
> bool removed_any = false;
> - for (size_t cnt = 0; imap->l_scope[cnt] != NULL; ++cnt)
> + for (size_t cnt = 0;
> + imap->l_scope && imap->l_scope[cnt] != NULL;
> + ++cnt)
> /* This relies on l_scope[] entries being always set either
> to its own l_symbolic_searchlist address, or some map's
> l_searchlist address. */
> @@ -686,8 +689,10 @@ _dl_close_worker (struct link_map *map, bool force)
>
> /* We can unmap all the maps at once. We determined the
> start address and length when we loaded the object and
> - the `munmap' call does the rest. */
> - DL_UNMAP (imap);
> + the `munmap' call does the rest. Proxies do not have
> + any segments of their own to unmap. */
> + if (!imap->l_proxy)
> + DL_UNMAP (imap);
>
> /* Finally, unlink the data structure and free it. */
> #if DL_NNS == 1
> @@ -727,19 +732,23 @@ _dl_close_worker (struct link_map *map, bool force)
> _dl_debug_printf ("\nfile=%s [%lu]; destroying link map\n",
> imap->l_name, imap->l_ns);
>
> - /* This name always is allocated. */
> - free (imap->l_name);
> - /* Remove the list with all the names of the shared object. */
> + /* Skip structures borrowed by proxies from the real map. */
> + if (!imap->l_proxy)
> + {
> + /* This name always is allocated. */
> + free (imap->l_name);
> + /* Remove the list with all the names of the shared object. */
>
> - struct libname_list *lnp = imap->l_libname;
> - do
> - {
> - struct libname_list *this = lnp;
> - lnp = lnp->next;
> - if (!this->dont_free)
> - free (this);
> - }
> - while (lnp != NULL);
> + struct libname_list *lnp = imap->l_libname;
> + do
> + {
> + struct libname_list *this = lnp;
> + lnp = lnp->next;
> + if (!this->dont_free)
> + free (this);
> + }
> + while (lnp != NULL);
> + }
>
> /* Remove the searchlists. */
> free (imap->l_initfini);
> diff --git a/elf/dl-fini.c b/elf/dl-fini.c
> index 6dbdfe4b3e..10194488bb 100644
> --- a/elf/dl-fini.c
> +++ b/elf/dl-fini.c
> @@ -73,7 +73,7 @@ _dl_fini (void)
> assert (nloaded != 0 || GL(dl_ns)[ns]._ns_loaded == NULL);
> for (l = GL(dl_ns)[ns]._ns_loaded, i = 0; l != NULL; l = l->l_next)
> /* Do not handle ld.so in secondary namespaces. */
> - if (l == l->l_real)
> + if (l == l->l_real || l->l_proxy)
> {
> assert (i < nloaded);
>
> @@ -111,7 +111,9 @@ _dl_fini (void)
> {
> struct link_map *l = maps[i];
>
> - if (l->l_init_called)
> + /* Do not call fini functions via proxies, or for
> + objects which are not marked as initialised. */
> + if (l->l_init_called && !l->l_proxy)
> {
> /* Make sure nothing happens if we are called twice. */
> l->l_init_called = 0;
> diff --git a/elf/dl-init.c b/elf/dl-init.c
> index f924d26642..00ce8bb9d6 100644
> --- a/elf/dl-init.c
> +++ b/elf/dl-init.c
> @@ -30,8 +30,8 @@ call_init (struct link_map *l, int argc, char **argv, char **env)
> need relocation, and neither do proxy objects.) */
> assert (l->l_real->l_relocated || l->l_real->l_type == lt_executable);
>
> - if (l->l_init_called)
> - /* This object is all done. */
> + if (l->l_init_called || l->l_proxy)
> + /* This object is all done, or a proxy (and therefore initless). */
> return;
>
> /* Avoid handling this constructor again in case we have a circular
> diff --git a/elf/dl-load.c b/elf/dl-load.c
> index f2dbe45703..11513e1992 100644
> --- a/elf/dl-load.c
> +++ b/elf/dl-load.c
> @@ -838,6 +838,53 @@ _dl_init_paths (const char *llp, const char *source,
> __rtld_env_path_list.dirs = (void *) -1;
> }
>
> +static bool
> +has_gnu_unique (int fd, const ElfW(Ehdr) *header, const ElfW(Phdr) *phdr)
> +{
> + bool unique = false;
> + const ElfW(Phdr) *ph;
> +
> + for (ph = phdr; ph < &phdr[header->e_phnum]; ++ph)
> + {
> + off64_t end;
> + off64_t pos;
> + ssize_t bytes = -1;
> + ElfW(Dyn) entry = { .d_tag = 0, .d_un.d_val = 0 };
> +
> + switch (ph->p_type)
> + {
> + case PT_DYNAMIC:
> + pos = ph->p_offset;
> + end = pos + ph->p_filesz;
> +
> + while (pos < end)
> + {
> + bytes = __pread64_nocancel (fd, &entry, sizeof (ElfW(Dyn)), pos);
> +
> + if (__glibc_unlikely (bytes != sizeof (ElfW(Dyn))))
> + goto done;
> +
> + pos += bytes;
> +
> + switch (entry.d_tag)
> + {
> + case DT_GNU_FLAGS_1:
> + unique = (entry.d_un.d_val & DF_GNU_1_UNIQUE);
> + goto done;
> + break;
> +
> + case DT_NULL:
> + goto done;
> + break;
> + }
> + }
> + break;
> + }
> + }
> +
> + done:
> + return unique;
> +}
>
> /* Process PT_GNU_PROPERTY program header PH in module L after
> PT_LOAD segments are mapped. Only one NT_GNU_PROPERTY_TYPE_0
> @@ -1021,6 +1068,32 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
> }
> #endif
>
> + /* DSOs in the main namespace which are flagged DF_GNU_1_UNIQUE should only
> + be opened into the main namespace. Other namespaces should only get
> + proxies. */
> + if (__glibc_unlikely ((nsid != LM_ID_BASE) && !(mode & RTLD_ISOLATE)))
> + {
> + /* Check base ns to see if the name matched another already loaded. */
> + for (l = GL(dl_ns)[LM_ID_BASE]._ns_loaded; l != NULL; l = l->l_next)
> + if (!l->l_removed && _dl_file_id_match_p (&l->l_file_id, &id))
> + {
> + if (!(l->l_gnu_flags_1 & DF_GNU_1_UNIQUE))
> + continue;
> +
> + /* Already loaded. Bump its reference count and return it. */
> + __close_nocancel (fd);
> +
> + /* If the name is not listed for this object add it. */
> + free (realname);
> + add_name_to_object (l, name);
> +
> + /* NOTE: It is important that our caller picks up on the fact
> + that we have NOT returned an object in the requested namespace
> + and handles the proxying correctly. */
> + return l;
> + }
> + }
> +
> if (mode & RTLD_NOLOAD)
> {
> /* We are not supposed to load the object unless it is already
> @@ -1046,8 +1119,11 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
> && __glibc_unlikely (GLRO(dl_naudit) > 0))
> {
> struct link_map *head = GL(dl_ns)[nsid]._ns_loaded;
> - /* Do not call the functions for any auditing object. */
> - if (head->l_auditing == 0)
> + /* Do not call the functions for any auditing object.
> + Do not try to call auditing functions if the namespace
> + is currently empty. This can hapen when opening the first
> + DSO in a new namespace. */
> + if ((head != NULL) && (head->l_auditing == 0))
> {
> struct audit_ifaces *afct = GLRO(dl_audit);
> for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
> @@ -1073,6 +1149,32 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
> else
> assert (r->r_state == RT_ADD);
>
> + /* Load the ELF header using preallocated struct space if it's big enough. */
> + maplength = header->e_phnum * sizeof (ElfW(Phdr));
> + if (header->e_phoff + maplength <= (size_t) fbp->len)
> + phdr = (void *) (fbp->buf + header->e_phoff);
> + else
> + {
> + phdr = alloca (maplength);
> + if ((size_t) __pread64_nocancel (fd, (void *) phdr, maplength,
> + header->e_phoff) != maplength)
> + {
> + errstring = N_("cannot read file data");
> + goto lose_errno;
> + }
> + }
> +
> + /* We need to check for DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE before we start
> + initialising any namespace dependent metatada. */
> + if (__glibc_unlikely ((nsid != LM_ID_BASE) && !(mode & RTLD_ISOLATE)))
> + {
> + /* Target DSO is flagged as unique: Make sure it gets loaded into
> + the base namespace. It is up to our caller to generate a proxy
> + in the target nsid. */
> + if (has_gnu_unique (fd, header, phdr))
> + nsid = LM_ID_BASE;
> + }
> +
> /* Enter the new object in the list of loaded objects. */
> l = _dl_new_object (realname, name, l_type, loader, mode, nsid);
> if (__glibc_unlikely (l == NULL))
> @@ -1090,20 +1192,6 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd,
> type = header->e_type;
> l->l_phnum = header->e_phnum;
>
> - maplength = header->e_phnum * sizeof (ElfW(Phdr));
> - if (header->e_phoff + maplength <= (size_t) fbp->len)
> - phdr = (void *) (fbp->buf + header->e_phoff);
> - else
> - {
> - phdr = alloca (maplength);
> - if ((size_t) __pread64_nocancel (fd, (void *) phdr, maplength,
> - header->e_phoff) != maplength)
> - {
> - errstring = N_("cannot read file data");
> - goto lose_errno;
> - }
> - }
> -
> /* On most platforms presume that PT_GNU_STACK is absent and the stack is
> * executable. Other platforms default to a nonexecutable stack and don't
> * need PT_GNU_STACK to do so. */
> @@ -2007,6 +2095,37 @@ open_path (const char *name, size_t namelen, int mode,
> return -1;
> }
>
> +/* Search for a link map proxy in the given namespace by name.
> + Consider it to be an error if the found object is not a proxy. */
> +struct link_map *
> +_dl_find_proxy (Lmid_t nsid, const char *name)
> +{
> + struct link_map *l;
> +
> + for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
> + {
> + if (__glibc_unlikely ((l->l_faked | l->l_removed) != 0))
> + continue;
> +
> + if (!_dl_name_match_p (name, l))
> + continue;
> +
> + /* We have a match - stop searching. */
> + break;
> + }
> +
> + if (l != NULL)
> + {
> + if (l->l_proxy)
> + return l;
> +
> + _dl_signal_error (EEXIST, name, NULL,
> + N_("object cannot be demoted to a proxy"));
> + }
> +
> + return NULL;
> +}
> +
> /* Search for a shared object in a given namespace. */
> struct link_map *
> _dl_find_dso (const char *name, Lmid_t nsid)
> @@ -2060,12 +2179,42 @@ _dl_map_object (struct link_map *loader, const char *name,
>
> assert (nsid >= 0);
> assert (nsid < GL(dl_nns));
> + assert (!((mode & RTLD_ISOLATE) && (mode & RTLD_SHARED)));
> +
> +#ifdef SHARED
> + /* Only need to do proxy checks if 'nsid' is not LM_ID_BASE. */
> + if (__glibc_unlikely ((mode & RTLD_SHARED) && (nsid != LM_ID_BASE)))
> + {
> + /* Search the namespace in case the object is already proxied. */
> + l = _dl_find_proxy (nsid, name);
> + if (l != NULL)
> + return l;
> +
> + /* Further searches should be in the base ns: We will proxy the
> + resulting object in dl_open_worker *after* it is initialised. */
> + nsid = LM_ID_BASE;
> + }
> +#endif
>
> /* Look for this name among those already loaded. */
> l = _dl_find_dso (name, nsid);
>
> if (l != NULL)
> {
> +#ifdef SHARED
> + /* If we are trying to load a DF_GNU_1_UNIQUE flagged DSO which WAS
> + already opened in the target NS but with RTLD_ISOLATE so it WAS NOT
> + created as a proxy we need to error out since we cannot satisfy the
> + DF_GNU_1_UNIQUE is-equivalent-to RTLD_SHARED semantics. */
> + if (!(mode & RTLD_ISOLATE) &&
> + (l->l_ns != LM_ID_BASE) &&
> + (l->l_gnu_flags_1 & DF_GNU_1_UNIQUE) &&
> + !l->l_proxy)
> + {
> + _dl_signal_error (EEXIST, name, NULL,
> + N_("object cannot be demoted to a proxy"));
> + }
> +#endif
> return l;
> }
>
> diff --git a/elf/dl-object.c b/elf/dl-object.c
> index 1875599eb2..30a05b086f 100644
> --- a/elf/dl-object.c
> +++ b/elf/dl-object.c
> @@ -21,6 +21,7 @@
> #include <stdlib.h>
> #include <unistd.h>
> #include <ldsodefs.h>
> +#include <libintl.h>
>
> #include <assert.h>
>
> @@ -50,6 +51,83 @@ _dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid)
> __rtld_lock_unlock_recursive (GL(dl_load_write_lock));
> }
>
> +/* Proxy an existing link map entry into a new link map:
> + This is based on _dl_new_object, skipping the steps we know we won't need
> + because this is mostly just a shell for the l_real pointer holding the real
> + link map entry (normally l == l->l_real, but not for ld.so in non-main
> + link maps or RTLD_SHARED proxies).
> + It also flags the proxy by setting l_proxy, and sets the the no-delete
> + flag in the original if it is an lt_loaded. */
> +struct link_map *
> +_dl_new_proxy (struct link_map *old, int mode, Lmid_t nsid)
> +{
> + const char *name;
> + struct link_map *new;
> + struct libname_list *newname;
> +#ifdef SHARED
> + unsigned int na = GLRO(dl_naudit);
> +
> + if ((mode & __RTLD_OPENEXEC) != 0)
> + na = DL_NNS;
> +
> + size_t audit_space = na * sizeof (struct auditstate);
> +#else
> +# define audit_space 0
> +#endif
> +
> + name = old->l_name;
> +
> + /* Find the original link map entry if 'old' is itself a proxy. */
> + while (old != NULL && old->l_proxy)
> + old = old->l_real;
> +
> + if (old == NULL)
> + _dl_signal_error (EINVAL, name, NULL, N_("cannot proxy NULL link_map"));
> +
> + /* Object already exists in the target namespace. This should get handled
> + by dl_open_worker but just in case we get this far, handle it: */
> + if (__glibc_unlikely (old->l_ns == nsid))
> + _dl_signal_error (EEXIST, name, NULL,
> + N_("existing object cannot be demoted to a proxy"));
> +
> + /* Now duplicate as little of _dl_new_object as possible to get a
> + working proxied object in the target link map. */
> + new = (struct link_map *) calloc (sizeof (*new) + audit_space
> + + sizeof (struct link_map *)
> + + sizeof (*newname) + PATH_MAX, 1);
> +
> + if (new == NULL)
> + _dl_signal_error (ENOMEM, name, NULL,
> + N_("cannot create shared object descriptor"));
> +
> + /* Specific to the proxy. */
> + new->l_real = old;
> + new->l_proxy = 1;
> + new->l_ns = nsid;
> +
> + /* Copied from the origin. */
> + new->l_libname = old->l_libname;
> + new->l_name = old->l_name;
> + /* Proxies are considered lt_loaded if the real entry type is lt_library. */
> + new->l_type = (old->l_type == lt_library) ? lt_loaded : old->l_type;
> +
> + if (__glibc_unlikely (mode & RTLD_NODELETE))
> + new->l_flags_1 |= DF_1_NODELETE;
> +
> + /* Specific to the origin. Ideally we'd do some accounting here but
> + for now it's easier to pin the original so the proxy remains valid. */
> + if (old->l_type == lt_loaded)
> + old->l_flags_1 |= DF_1_NODELETE;
> +
> + /* Fix up the searchlist so that relocations work. */
> + _dl_map_object_deps (new, NULL, 0, 0,
> + mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));
> +
> + /* And finally put the proxy in the target namespace. */
> + _dl_add_to_namespace_list (new, nsid);
> +
> + return new;
> +}
>
> /* Allocate a `struct link_map' for a new object being loaded,
> and enter it into the _dl_loaded list. */
> diff --git a/elf/dl-open.c b/elf/dl-open.c
> index ab7aaa345e..083e6b2c3f 100644
> --- a/elf/dl-open.c
> +++ b/elf/dl-open.c
> @@ -484,6 +484,16 @@ dl_open_worker (void *a)
> const char *file = args->file;
> int mode = args->mode;
> struct link_map *call_map = NULL;
> + struct link_map *preloaded = NULL;
> + bool want_proxy = false;
> + bool dl_isolate = mode & RTLD_ISOLATE;
> + Lmid_t proxy_ns = LM_ID_BASE;
> +
> + /* Isolation means we should suppress all inter-namespace sharing. */
> + if (dl_isolate)
> + mode &= ~RTLD_SHARED;
> + else
> + want_proxy = mode & RTLD_SHARED;
>
> /* Determine the caller's map if necessary. This is needed in case
> we have a DST, when we don't know the namespace ID we have to put
> @@ -508,6 +518,15 @@ dl_open_worker (void *a)
> args->nsid = call_map->l_ns;
> }
>
> + /* Now that we know the NS for sure, sanity check the mode. */
> + if (__glibc_likely (args->nsid == LM_ID_BASE) &&
> + __glibc_unlikely (mode & RTLD_SHARED))
> + {
> + args->mode &= ~RTLD_SHARED;
> + mode &= ~RTLD_SHARED;
> + want_proxy = 0;
> + }
> +
> /* The namespace ID is now known. Keep track of whether libc.so was
> already loaded, to determine whether it is necessary to call the
> early initialization routine (or clear libc_map on error). */
> @@ -521,6 +540,24 @@ dl_open_worker (void *a)
> may not be true if this is a recursive call to dlopen. */
> _dl_debug_initialize (0, args->nsid);
>
> + /* Target Lmid is not the base and we haven't explicitly asked for a proxy:
> + We need to check for a matching DSO in the base Lmid in case it is flagged
> + DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE in which case we add RTLD_SHARED to the
> + mode and set want_proxy.
> + NOTE: RTLD_ISOLATE in the mode suppresses this behaviour. */
> + if (__glibc_unlikely (args->nsid != LM_ID_BASE) &&
> + __glibc_likely (!dl_isolate) &&
> + __glibc_likely (!want_proxy))
> + {
> + preloaded = _dl_find_dso (file, LM_ID_BASE);
> +
> + if ((preloaded != NULL) && (preloaded->l_gnu_flags_1 & DF_GNU_1_UNIQUE))
> + {
> + want_proxy = true;
> + mode |= RTLD_SHARED;
> + }
> + }
> +
> /* Load the named object. */
> struct link_map *new;
> args->map = new = _dl_map_object (call_map, file, lt_loaded, 0,
> @@ -541,6 +578,35 @@ dl_open_worker (void *a)
> /* This object is directly loaded. */
> ++new->l_direct_opencount;
>
> + /* Proxy already existed in the target ns, nothing left to do. */
> + if (__glibc_unlikely (new->l_proxy))
> + {
> + if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
> + _dl_debug_printf ("proxied file=%s [%lu]; direct_opencount=%u\n\n",
> + new->l_name, new->l_ns, new->l_direct_opencount);
> + return;
> + }
> +
> + /* If we are trying to load a DF_GNU_1_UNIQUE flagged DSO which was
> + NOT ALREADY LOADED (or not loaded with the name we are using) then
> + _dl_map_object will have returned an instance from the main namespace.
> + We need to detect this and set up the RTLD_SHARED flags. */
> + if (__glibc_unlikely (args->nsid != LM_ID_BASE && new->l_ns == LM_ID_BASE))
> + {
> + want_proxy = RTLD_SHARED;
> + mode |= RTLD_SHARED;
> + }
> +
> + /* If we want proxy and we get this far then the entry in 'new' will
> + be in the main namespace: we should revert to the main namespace code
> + path(s), but remember the namespace we want the proxy to be in. */
> + if (__glibc_unlikely (want_proxy))
> + {
> + proxy_ns = args->nsid;
> + args->nsid = LM_ID_BASE;
> + args->libc_already_loaded = GL(dl_ns)[LM_ID_BASE].libc_map != NULL;
> + }
> +
> /* It was already open. */
> if (__glibc_unlikely (new->l_searchlist.r_list != NULL))
> {
> @@ -572,6 +638,16 @@ dl_open_worker (void *a)
>
> assert (_dl_debug_initialize (0, args->nsid)->r_state == RT_CONSISTENT);
>
> + if (__glibc_unlikely (want_proxy))
> + {
> + args->map = new = _dl_new_proxy (new, mode, proxy_ns);
> + ++new->l_direct_opencount;
> +
> + if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
> + _dl_debug_printf ("proxying file=%s [%lu]; direct_opencount=%u\n\n",
> + new->l_name, new->l_ns, new->l_direct_opencount);
> + }
> +
> return;
> }
>
> @@ -582,7 +658,8 @@ dl_open_worker (void *a)
>
> /* Load that object's dependencies. */
> _dl_map_object_deps (new, NULL, 0, 0,
> - mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT));
> + mode & (__RTLD_DLOPEN | RTLD_DEEPBIND | __RTLD_AUDIT |
> + RTLD_ISOLATE));
>
> /* So far, so good. Now check the versions. */
> for (unsigned int i = 0; i < new->l_searchlist.r_nlist; ++i)
> @@ -753,16 +830,21 @@ dl_open_worker (void *a)
> namespace. */
> if (!args->libc_already_loaded)
> {
> + /* If this is a secondary (nsid != LM_ID_BASE) namespace then
> + it is POSSIBLE there's no libc_map at all - We use the one
> + shared with LM_ID_BASE instead (which MUST already be
> + initialised for us to even reach here). */
> struct link_map *libc_map = GL(dl_ns)[args->nsid].libc_map;
> #ifdef SHARED
> - bool initial = libc_map->l_ns == LM_ID_BASE;
> + bool initial = (libc_map != NULL) && (libc_map->l_real->l_ns == LM_ID_BASE);
> #else
> /* In the static case, there is only one namespace, but it
> contains a secondary libc (the primary libc is statically
> linked). */
> bool initial = false;
> #endif
> - _dl_call_libc_early_init (libc_map, initial);
> + if (libc_map != NULL)
> + _dl_call_libc_early_init (libc_map, initial);
> }
>
> #ifndef SHARED
> @@ -787,10 +869,27 @@ dl_open_worker (void *a)
> if (mode & RTLD_GLOBAL)
> add_to_global_update (new);
>
> + if (__glibc_unlikely (want_proxy))
> + {
> + /* args->map is the return slot which the caller sees, but keep
> + the original value of new hanging around so we can see the
> + real link map entry (for logging etc). */
> + args->map = _dl_new_proxy (new, mode, proxy_ns);
> + ++args->map->l_direct_opencount;
> + }
> +
> /* Let the user know about the opencount. */
> if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_FILES))
> - _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
> - new->l_name, new->l_ns, new->l_direct_opencount);
> + {
> + _dl_debug_printf ("opening file=%s [%lu]; direct_opencount=%u\n\n",
> + new->l_name, new->l_ns, new->l_direct_opencount);
> +
> + if (args->map->l_proxy)
> + _dl_debug_printf ("proxying file=%s [%lu]; direct_opencount=%u\n\n",
> + args->map->l_name,
> + args->map->l_ns,
> + args->map->l_direct_opencount);
> + }
> }
>
> void *
> diff --git a/elf/dl-sym.c b/elf/dl-sym.c
> index dfd6169e12..b7252804ad 100644
> --- a/elf/dl-sym.c
> +++ b/elf/dl-sym.c
> @@ -96,6 +96,10 @@ do_sym (void *handle, const char *name, void *who,
> {
> match = _dl_sym_find_caller_link_map (caller);
>
> + /* Proxies don't contain any symbols: Need to look at the real DSO. */
> + if (__glibc_unlikely (match->l_proxy))
> + match = match->l_real;
> +
> /* Search the global scope. We have the simple case where
> we look up in the scope of an object which was part of
> the initial binary. And then the more complex part
> @@ -140,6 +144,11 @@ RTLD_NEXT used in code not dynamically loaded"));
> }
>
> struct link_map *l = match;
> +
> + /* Proxies don't contain any symbols: Need to look at the real DSO. */
> + if (__glibc_unlikely (l->l_proxy))
> + l = l->l_real;
> +
> while (l->l_loader != NULL)
> l = l->l_loader;
>
> @@ -150,6 +159,11 @@ RTLD_NEXT used in code not dynamically loaded"));
> {
> /* Search the scope of the given object. */
> struct link_map *map = handle;
> +
> + /* Proxies don't contain any symbols: Need to look at the real DSO. */
> + if (__glibc_unlikely (map->l_proxy))
> + map = map->l_real;
> +
> result = GLRO(dl_lookup_symbol_x) (name, map, &ref, map->l_local_scope,
> vers, 0, flags, NULL);
> }
> diff --git a/elf/rtld.c b/elf/rtld.c
> index 94a00e2049..e02ae18c1d 100644
> --- a/elf/rtld.c
> +++ b/elf/rtld.c
> @@ -660,7 +660,7 @@ dlmopen_doit (void *a)
> struct dlmopen_args *args = (struct dlmopen_args *) a;
> args->map = _dl_open (args->fname,
> (RTLD_LAZY | __RTLD_DLOPEN | __RTLD_AUDIT
> - | __RTLD_SECURE),
> + | __RTLD_SECURE | RTLD_ISOLATE),
> dl_main, LM_ID_NEWLM, _dl_argc, _dl_argv,
> __environ);
> }
> diff --git a/include/link.h b/include/link.h
> index 6ed35eb808..55e0cad71d 100644
> --- a/include/link.h
> +++ b/include/link.h
> @@ -107,8 +107,9 @@ struct link_map
> They may change without notice. */
>
> /* This is an element which is only ever different from a pointer to
> - the very same copy of this type for ld.so when it is used in more
> - than one namespace. */
> + the very same copy of this type when:
> + - A shallow copy of ld.so is placed in namespaces other than LM_ID_BASE.
> + - An object is proxied into a namespace by dlmopen with RTLD_SHARED. */
> struct link_map *l_real;
>
> /* Number of the namespace this link map belongs to. */
> @@ -180,6 +181,7 @@ struct link_map
> unsigned int l_relocated:1; /* Nonzero if object's relocations done. */
> unsigned int l_init_called:1; /* Nonzero if DT_INIT function called. */
> unsigned int l_global:1; /* Nonzero if object in _dl_global_scope. */
> + unsigned int l_proxy:1; /* Nonzero if object is a shallow copy. */
> unsigned int l_reserved:2; /* Reserved for internal use. */
> unsigned int l_phdr_allocated:1; /* Nonzero if the data structure pointed
> to by `l_phdr' is allocated. */
> diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
> index 08791fbc0f..641176e7d9 100644
> --- a/sysdeps/generic/ldsodefs.h
> +++ b/sysdeps/generic/ldsodefs.h
> @@ -978,6 +978,11 @@ extern lookup_t _dl_lookup_symbol_x (const char *undef,
> struct link_map *skip_map)
> attribute_hidden;
>
> +/* Proxy an existing link map entry into a new link map */
> +extern struct link_map *_dl_new_proxy (struct link_map *old,
> + int mode,
> + Lmid_t nsid)
> + attribute_hidden;
>
> /* Restricted version of _dl_lookup_symbol_x. Searches MAP (and only
> MAP) for the symbol UNDEF_NAME, with GNU hash NEW_HASH (computed
> diff --git a/sysdeps/mips/bits/dlfcn.h b/sysdeps/mips/bits/dlfcn.h
> index 5cec898de3..898797f863 100644
> --- a/sysdeps/mips/bits/dlfcn.h
> +++ b/sysdeps/mips/bits/dlfcn.h
> @@ -32,6 +32,16 @@
> visible as if the object were linked directly into the program. */
> #define RTLD_GLOBAL 0x0004
>
> +/* If the following bit is set in the MODE argument to dlmopen
> + then the target object is loaded into the main namespace (if
> + it is not already there) and a shallow copy (proxy) is placed
> + in the target namespace: This allows multiple namespaces to
> + share a single instance of a DSO. */
> +#define RTLD_SHARED 0x00020
> +
> +/* Suppress RTLD_SHARED and/or DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE */
> +#define RTLD_ISOLATE 0x00040
> +
> /* Unix98 demands the following flag which is the inverse to RTLD_GLOBAL.
> The implementation does this by default and so we can define the
> value to zero. */
>
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag (bug 22745)
2021-05-28 17:32 ` Adhemerval Zanella
@ 2021-05-28 18:02 ` Adhemerval Zanella
2021-06-02 15:42 ` Vivek Das Mohapatra
2021-05-28 23:22 ` Vivek Das Mohapatra
1 sibling, 1 reply; 23+ messages in thread
From: Adhemerval Zanella @ 2021-05-28 18:02 UTC (permalink / raw)
To: Vivek Das Mohapatra, libc-alpha
On 28/05/2021 14:32, Adhemerval Zanella wrote:
>>
>> elf/dl-sym.c: dlsym, dlvsym must be able to resolve symbols via proxies
>
> With this patch I am seeing some regression with binutils with and
> without -z unique support:
>
> FAIL: elf/tst-dlmopen-dlerror
> FAIL: elf/tst-tls-ie-dlmopen
>
> $ ./debugglibc.sh -- elf/tst-dlmopen-dlerror --direct
> [...]
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007ffff7fdf44f in _dl_open (file=<optimized out>, mode=<optimized out>, caller_dlopen=0x7ffff7dd1383, nsid=-2, argc=2, argv=0x7fffffffd5c0, env=0x7fffffffd5d8) at dl-open.c:995
> 995 GL(dl_ns)[nsid].libc_map = NULL;
> (gdb) bt
> #0 0x00007ffff7fdf44f in _dl_open (file=<optimized out>, mode=<optimized out>, caller_dlopen=0x7ffff7dd1383, nsid=-2, argc=2, argv=0x7fffffffd5c0, env=0x7fffffffd5d8) at dl-open.c:995
> #1 0x00007ffff7fbf288 in dlopen_doit (a=a@entry=0x7fffffffcb70) at dlopen.c:66
> #2 0x00007ffff7f0f769 in __GI__dl_catch_exception (exception=exception@entry=0x7fffffffcad0, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:208
> #3 0x00007ffff7f0f80f in __GI__dl_catch_error (objname=0x7fffffffcb30, errstring=0x7fffffffcb38, mallocedp=0x7fffffffcb2f, operate=<optimized out>, args=<optimized out>) at dl-error-skeleton.c:227
> #4 0x00007ffff7fbf776 in _dlerror_run (operate=operate@entry=0x7ffff7fbf230 <dlopen_doit>, args=args@entry=0x7fffffffcb70) at dlerror.c:142
> #5 0x00007ffff7fbf306 in __dlopen (file=<optimized out>, mode=<optimized out>) at dlopen.c:87
> #6 0x00007ffff7dd1383 in ?? ()
> #7 0x000000000000002b in ?? ()
> #8 0x00007fffffffcbd0 in ?? ()
> #9 0x00007ffff7dd1370 in ?? ()
> #10 0x0000000000402595 in do_test () at tst-dlmopen-dlerror.c:43
> #11 0x0000000000402d75 in support_test_main (argc=1, argc@entry=2, argv=0x7fffffffd5c8, argv@entry=0x7fffffffd5c0, config=config@entry=0x7fffffffd450) at support_test_main.c:403
> #12 0x0000000000402385 in main (argc=argc@entry=2, argv=argv@entry=0x7fffffffd5c0) at ../support/test-driver.c:168
> #13 0x00007ffff7dff407 in __libc_start_call_main (main=main@entry=0x402350 <main>, argc=argc@entry=2, argv=argv@entry=0x7fffffffd5c0) at ../sysdeps/nptl/libc_start_call_main.h:58
> #14 0x00007ffff7dff4b8 in __libc_start_main_impl (main=0x402350 <main>, argc=2, argv=0x7fffffffd5c0, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffd5b8)
> at ../csu/libc-start.c:411
> #15 0x0000000000402411 in _start () at ../sysdeps/x86_64/start.S:116
>
The 'loader' GL(dl_ns)[nsid].libc_map points to a read-only memory segment,
I haven't debug it further.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag (bug 22745)
2021-05-28 17:32 ` Adhemerval Zanella
2021-05-28 18:02 ` Adhemerval Zanella
@ 2021-05-28 23:22 ` Vivek Das Mohapatra
1 sibling, 0 replies; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-05-28 23:22 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
> FAIL: elf/tst-dlmopen-dlerror
> FAIL: elf/tst-tls-ie-dlmopen
> Could you check if this is something related to recent changes?
> I will stop the review process until we sort these out.
Looking into it.
^ permalink raw reply [flat|nested] 23+ messages in thread
* Re: [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag (bug 22745)
2021-05-28 18:02 ` Adhemerval Zanella
@ 2021-06-02 15:42 ` Vivek Das Mohapatra
0 siblings, 0 replies; 23+ messages in thread
From: Vivek Das Mohapatra @ 2021-06-02 15:42 UTC (permalink / raw)
To: Adhemerval Zanella; +Cc: libc-alpha
> The 'loader' GL(dl_ns)[nsid].libc_map points to a read-only memory segment,
> I haven't debug it further.
Stared at the code for a while and did some code tweaking and figured it out:
If the library is loaded _without_ RTLD_ISOLATE then some error paths will
not result in a new namespace being initialised at all (since libc will be
shared with the main namespace), which in turn means that nsid will never be
upgraded from LM_ID_NEWLM (-1).
So in the error path you'll try a negative offset from GL(dl_ns) and Very
Bad Things will happen.
Easy enough to add a guard for. I'll address the comments so far and send a
new patch series.
^ permalink raw reply [flat|nested] 23+ messages in thread
end of thread, other threads:[~2021-06-02 15:42 UTC | newest]
Thread overview: 23+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-03-22 15:41 [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 1/7] Define a new dynamic section tag - DT_GNU_FLAGS_1 (bug 22745) Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 2/7] Abstract loaded-DSO search code into a helper function Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 3/7] Use the new DSO finder " Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-03-22 15:41 ` [RFC][PATCH v10 4/7] Add DT_GNU_FLAGS_1/DF_GNU_1_UNIQUE to glibc DSOs (bug 22745) Vivek Das Mohapatra
2021-05-28 14:53 ` Adhemerval Zanella
2021-05-28 16:59 ` Adhemerval Zanella
2021-05-28 17:18 ` Andreas Schwab
2021-03-22 15:41 ` [RFC][PATCH v10 5/7] Implement dlmopen RTLD_SHARED flag " Vivek Das Mohapatra
2021-05-28 17:32 ` Adhemerval Zanella
2021-05-28 18:02 ` Adhemerval Zanella
2021-06-02 15:42 ` Vivek Das Mohapatra
2021-05-28 23:22 ` Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 6/7] Add dlmopen / RTLD_SHARED tests Vivek Das Mohapatra
2021-03-22 15:41 ` [RFC][PATCH v10 7/7] Restore separate libc loading for the TLS/namespace storage test Vivek Das Mohapatra
2021-03-25 15:15 ` [RFC][PATCH v10 0/7] Implementation of RTLD_SHARED for dlmopen Vivek Das Mohapatra
2021-04-13 17:02 ` Vivek Das Mohapatra
2021-04-29 15:25 ` Vivek Das Mohapatra
2021-05-11 17:42 ` Vivek Das Mohapatra
2021-05-17 19:08 ` [PING][PATCH " Vivek Das Mohapatra
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