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| author | Cody P Schafer <cody@linux.vnet.ibm.com> | 2012-08-10 15:22:55 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-08-13 14:25:23 -0300 |
| commit | 492746546fe380da768c8496213e26aa91b9b3aa (patch) | |
| tree | b9f2ece27e3396dee92206b7cdc505af40f81372 /tools/perf/util/symbol-elf.c | |
| parent | 515850e4fbd87c8f249446faa2e5ad98e672711d (diff) | |
| download | blackbird-op-linux-492746546fe380da768c8496213e26aa91b9b3aa.tar.gz blackbird-op-linux-492746546fe380da768c8496213e26aa91b9b3aa.zip | |
perf symbols: Avoid segfault in elf_strptr
If we call elf_section_by_name() with a truncated elf image (ie: the
file header indicates that the section headers are placed past the end
of the file), elf_strptr() causes a segfault within libelf.
Avoid this by checking that we can access the section string table
properly.
Should really be fixed in libelf/elfutils.
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Hansen <dave@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Matt Hellsley <matthltc@us.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1344637382-22789-10-git-send-email-cody@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/symbol-elf.c')
| -rw-r--r-- | tools/perf/util/symbol-elf.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index a2e994e2605f..a9a194d49c1b 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -129,6 +129,10 @@ static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep, Elf_Scn *sec = NULL; size_t cnt = 1; + /* Elf is corrupted/truncated, avoid calling elf_strptr. */ + if (!elf_rawdata(elf_getscn(elf, ep->e_shstrndx), NULL)) + return NULL; + while ((sec = elf_nextscn(elf, sec)) != NULL) { char *str; |
