* [PATCH] Tests: Fix warning in show-die-info.c
@ 2021-10-05 15:36 Jan-Benedict Glaw
2021-10-06 21:55 ` Mark Wielaard
0 siblings, 1 reply; 4+ messages in thread
From: Jan-Benedict Glaw @ 2021-10-05 15:36 UTC (permalink / raw)
To: elfutils-devel
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Hi!
My last email had a wrong subject, though the patch was correct.
Here's a second patch, this time *actally* for tests/show-die-info.c:
diff --git a/tests/show-die-info.c b/tests/show-die-info.c
index 34e27a3b..0823cc60 100644
--- a/tests/show-die-info.c
+++ b/tests/show-die-info.c
@@ -97,7 +97,7 @@ handle (Dwarf *dbg, Dwarf_Die *die, int n)
printf ("%*s Attrs :", n * 5, "");
for (cnt = 0; cnt < 0xffff; ++cnt)
if (dwarf_hasattr (die, cnt))
- printf (" %s", dwarf_attr_string (cnt));
+ printf (" %s", (dwarf_attr_string (cnt)? dwarf_attr_string (cnt): ""));
puts ("");
if (dwarf_hasattr (die, DW_AT_low_pc) && dwarf_lowpc (die, &addr) == 0)
Please keep me Cc'ed as I'm not subscribed!
Thanks,
Jan-Benedict
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] Tests: Fix warning in show-die-info.c
2021-10-05 15:36 [PATCH] Tests: Fix warning in show-die-info.c Jan-Benedict Glaw
@ 2021-10-06 21:55 ` Mark Wielaard
0 siblings, 0 replies; 4+ messages in thread
From: Mark Wielaard @ 2021-10-06 21:55 UTC (permalink / raw)
To: Jan-Benedict Glaw; +Cc: elfutils-devel
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Hi Jan-Benedict,
On Tue, Oct 05, 2021 at 05:36:40PM +0200, Jan-Benedict Glaw wrote:
>
> My last email had a wrong subject, though the patch was correct.
> Here's a second patch, this time *actally* for tests/show-die-info.c:
>
> diff --git a/tests/show-die-info.c b/tests/show-die-info.c
> index 34e27a3b..0823cc60 100644
> --- a/tests/show-die-info.c
> +++ b/tests/show-die-info.c
> @@ -97,7 +97,7 @@ handle (Dwarf *dbg, Dwarf_Die *die, int n)
> printf ("%*s Attrs :", n * 5, "");
> for (cnt = 0; cnt < 0xffff; ++cnt)
> if (dwarf_hasattr (die, cnt))
> - printf (" %s", dwarf_attr_string (cnt));
> + printf (" %s", (dwarf_attr_string (cnt)? dwarf_attr_string (cnt): ""));
> puts ("");
>
> if (dwarf_hasattr (die, DW_AT_low_pc) && dwarf_lowpc (die, &addr) == 0)
This can be fixed in a shorter way using dwarf_attr_string ?: "<unknown>".
Which is what I pushed (see attached).
Thanks,
Mark
[-- Attachment #2: 0001-tests-Handle-dwarf_attr_string-returning-NULL-in-sho.patch --]
[-- Type: text/x-diff, Size: 1292 bytes --]
From 47b0ebe9033daa7ac9c732b25c85520b97f9635a Mon Sep 17 00:00:00 2001
From: Mark Wielaard <mark@klomp.org>
Date: Wed, 6 Oct 2021 23:53:34 +0200
Subject: [PATCH] tests: Handle dwarf_attr_string returning NULL in
show-die-info.c
Reported-by: Jan-Benedict Glaw <jbglaw@lug-owl.de>
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
tests/ChangeLog | 4 ++++
tests/show-die-info.c | 2 +-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/tests/ChangeLog b/tests/ChangeLog
index d289b27c..07e018b0 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2021-10-06 Mark Wielaard <mark@klomp.org>
+
+ * show-die-info.c (handle): Handle dwarf_attr_string returning NULL.
+
2021-10-06 Di Chen <dichen@redhat.com>
PR28242
diff --git a/tests/show-die-info.c b/tests/show-die-info.c
index 34e27a3b..1a3191cd 100644
--- a/tests/show-die-info.c
+++ b/tests/show-die-info.c
@@ -97,7 +97,7 @@ handle (Dwarf *dbg, Dwarf_Die *die, int n)
printf ("%*s Attrs :", n * 5, "");
for (cnt = 0; cnt < 0xffff; ++cnt)
if (dwarf_hasattr (die, cnt))
- printf (" %s", dwarf_attr_string (cnt));
+ printf (" %s", dwarf_attr_string (cnt) ?: "<unknown>");
puts ("");
if (dwarf_hasattr (die, DW_AT_low_pc) && dwarf_lowpc (die, &addr) == 0)
--
2.32.0
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] Tests: Fix warning in show-die-info.c
@ 2021-10-05 15:32 Jan-Benedict Glaw
2021-10-06 21:44 ` Mark Wielaard
0 siblings, 1 reply; 4+ messages in thread
From: Jan-Benedict Glaw @ 2021-10-05 15:32 UTC (permalink / raw)
To: elfutils-devel
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Hi!
I'm running automated test compiles on Binutils, GCC, Linux, NetBSD
and, since a few days ago, elfutils.
Building/running the tests, I noticed this little warning:
.../configure --enable-maintainer-mode --enable-tests-rpath --enable-gprof --enable-gcov --enable-valgrind --prefix=/tmp/elfutils
make make V=1
[make 2021-10-01 12:18:08] /usr/lib/gcc-snapshot/bin/gcc -std=gnu99 -Wall -Wshadow -Wformat=2 -Wold-style-definition -Wstrict-prototypes -Wtrampolines -Wlogical-op -Wduplicated-cond -Wnull-dereference -Wimplicit-fallthrough=5 -Werror -Wunused -Wextra -Wstack-usage=262144 -D_FORTIFY_SOURCE=2 -g -O2 -pg -fprofile-arcs -ftest-coverage -Wl,-rpath-link,../libelf:../libdw -Wno-error=stack-usage= -pg -fprofile-arcs -o strip strip.o ../libebl/libebl.a ../backends/libebl_backends.a ../libcpu/libcpu.a ../libelf/libelf.a -lz ../libdw/libdw.a -lz -lzstd -llzma -lbz2 ../libelf/libelf.a -lz -ldl -lpthread ../lib/libeu.a
[make 2021-10-01 12:18:08] /usr/lib/gcc-snapshot/bin/gcc -D_GNU_SOURCE -DHAVE_CONFIG_H -DLOCALEDIR='"/tmp/elfutils/share/locale"' -DDEBUGPRED=0 -DSRCDIR=\"/var/lib/laminar/run/elfutils/11/elfutils/src\" -DOBJDIR=\"/var/lib/laminar/run/elfutils/11/elfutils/src\" -I. -I.. -I. -I. -I../lib -I.. -I./../libelf -I./../libebl -I./../libdw -I./../libdwelf -I./../libdwfl -I./../libasm -std=gnu99 -Wall -Wshadow -Wformat=2 -Wold-style-definition -Wstrict-prototypes -Wtrampolines -Wlogical-op -Wduplicated-cond -Wnull-dereference -Wimplicit-fallthrough=5 -Werror -Wunused -Wextra -D_FORTIFY_SOURCE=2 -g -O2 -pg -fprofile-arcs -ftest-coverage -MT elflint.o -MD -MP -MF .deps/elflint.Tpo -c -o elflint.o elflint.c
[make 2021-10-01 12:18:15] elflint.c: In function 'check_sections':
[make 2021-10-01 12:18:15] elflint.c:4105:48: error: null pointer dereference [-Werror=null-dereference]
[make 2021-10-01 12:18:15] 4105 | idx < databits->d_size && ! bad;
[make 2021-10-01 12:18:15] | ~~~~~~~~^~~~~~~~
[make 2021-10-01 12:18:18] cc1: all warnings being treated as errors
[make 2021-10-01 12:18:18] make[2]: *** [Makefile:799: elflint.o] Error 1
[make 2021-10-01 12:18:18] make[1]: *** [Makefile:532: all-recursive] Error 1
[make 2021-10-01 12:18:18] make: *** [Makefile:448: all] Error 2
As it is tested beforehand that we should not run into this, this
patch should fix the warning:
diff --git a/src/elflint.c b/src/elflint.c
index 1ce75684..ef7725ce 100644
--- a/src/elflint.c
+++ b/src/elflint.c
@@ -4102,7 +4102,7 @@ section [%2zu] '%s' has type NOBITS but is read from the file in segment of prog
bad = (databits == NULL
|| databits->d_size != shdr->sh_size);
for (size_t idx = 0;
- idx < databits->d_size && ! bad;
+ ! bad && idx < databits->d_size;
idx++)
bad = ((char *) databits->d_buf)[idx] != 0;
Please keep me Cc'ed as I'm not subscribed.
Thanks,
Jan-Benedict
--
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] Tests: Fix warning in show-die-info.c
2021-10-05 15:32 Jan-Benedict Glaw
@ 2021-10-06 21:44 ` Mark Wielaard
0 siblings, 0 replies; 4+ messages in thread
From: Mark Wielaard @ 2021-10-06 21:44 UTC (permalink / raw)
To: Jan-Benedict Glaw; +Cc: elfutils-devel
[-- Attachment #1: Type: text/plain, Size: 1621 bytes --]
Hi,
On Tue, Oct 05, 2021 at 05:32:16PM +0200, Jan-Benedict Glaw wrote:
> I'm running automated test compiles on Binutils, GCC, Linux, NetBSD
> and, since a few days ago, elfutils.
>
> Building/running the tests, I noticed this little warning:
>
> [make 2021-10-01 12:18:15] elflint.c: In function 'check_sections':
> [make 2021-10-01 12:18:15] elflint.c:4105:48: error: null pointer dereference [-Werror=null-dereference]
> [make 2021-10-01 12:18:15] 4105 | idx < databits->d_size && ! bad;
> [make 2021-10-01 12:18:15] | ~~~~~~~~^~~~~~~~
> [make 2021-10-01 12:18:18] cc1: all warnings being treated as errors
> [make 2021-10-01 12:18:18] make[2]: *** [Makefile:799: elflint.o] Error 1
> [make 2021-10-01 12:18:18] make[1]: *** [Makefile:532: all-recursive] Error 1
> [make 2021-10-01 12:18:18] make: *** [Makefile:448: all] Error 2
>
>
> As it is tested beforehand that we should not run into this, this
> patch should fix the warning:
>
>
> diff --git a/src/elflint.c b/src/elflint.c
> index 1ce75684..ef7725ce 100644
> --- a/src/elflint.c
> +++ b/src/elflint.c
> @@ -4102,7 +4102,7 @@ section [%2zu] '%s' has type NOBITS but is read from the file in segment of prog
> bad = (databits == NULL
> || databits->d_size != shdr->sh_size);
> for (size_t idx = 0;
> - idx < databits->d_size && ! bad;
> + ! bad && idx < databits->d_size;
> idx++)
> bad = ((char *) databits->d_buf)[idx] != 0;
>
Thanks, that warning and the fix look correct.
I committed the attached fix.
Cheers,
Mark
[-- Attachment #2: 0001-elflint.c-Don-t-dereference-databits-if-bad.patch --]
[-- Type: text/x-diff, Size: 1520 bytes --]
From 3d9f12883d0c131bd4ab6045e1f60d3fe6d150ea Mon Sep 17 00:00:00 2001
From: Mark Wielaard <mark@klomp.org>
Date: Wed, 6 Oct 2021 23:37:42 +0200
Subject: [PATCH] elflint.c: Don't dereference databits if bad
elflint.c: In function 'check_sections':
elflint.c:4105:48: error: null pointer dereference [-Werror=null-dereference]
4105 | idx < databits->d_size && ! bad;
| ~~~~~~~~^~~~~~~~
Fix this by testing for ! bad first.
Reported-by: Jan-Benedict Glaw <jbglaw@lug-owl.de>
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
src/ChangeLog | 4 ++++
src/elflint.c | 2 +-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/src/ChangeLog b/src/ChangeLog
index 87b3dd46..316bcb6d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2021-10-06 Mark Wielaard <mark@klomp.org>
+
+ * elflint.c (check_sections): Don't dereference databits if bad.
+
2021-09-09 Dmitry V. Levin <ldv@altlinux.org>
* findtextrel.c: Include "libeu.h".
diff --git a/src/elflint.c b/src/elflint.c
index 1ce75684..ef7725ce 100644
--- a/src/elflint.c
+++ b/src/elflint.c
@@ -4102,7 +4102,7 @@ section [%2zu] '%s' has type NOBITS but is read from the file in segment of prog
bad = (databits == NULL
|| databits->d_size != shdr->sh_size);
for (size_t idx = 0;
- idx < databits->d_size && ! bad;
+ ! bad && idx < databits->d_size;
idx++)
bad = ((char *) databits->d_buf)[idx] != 0;
--
2.32.0
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-10-06 21:55 ` Mark Wielaard
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