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 <c...@linux.vnet.ibm.com>
---
tools/perf/util/symbol.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 9e31cbb..6afc92d 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -973,6 +973,10 @@ 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;
--
1.7.11.3
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