* [PATCH] elflint: Check symbol table data is big enough before checking.
@ 2017-03-27 21:58 Mark Wielaard
0 siblings, 0 replies; only message in thread
From: Mark Wielaard @ 2017-03-27 21:58 UTC (permalink / raw)
To: elfutils-devel; +Cc: Mark Wielaard
Before checking symbol index zero we should make sure the data size
is big enough.
https://sourceware.org/bugzilla/show_bug.cgi?id=21310
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
src/ChangeLog | 4 ++++
src/elflint.c | 3 ++-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/ChangeLog b/src/ChangeLog
index 0601198..3555942 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2017-03-27 Mark Wielaard <mark@klomp.org>
+
+ * elflint.c (check_symtab_shndx): Check data->d_size.
+
2017-02-16 Ulf Hermann <ulf.hermann@qt.io>
* addr2line.c: Include printversion.h
diff --git a/src/elflint.c b/src/elflint.c
index 66a13ca..76fb1a0 100644
--- a/src/elflint.c
+++ b/src/elflint.c
@@ -1959,7 +1959,8 @@ section [%2d] '%s': extended section index in section [%2zu] '%s' refers to same
return;
}
- if (*((Elf32_Word *) data->d_buf) != 0)
+ if (data->d_size < sizeof (Elf32_Word)
+ || *((Elf32_Word *) data->d_buf) != 0)
ERROR (gettext ("symbol 0 should have zero extended section index\n"));
for (size_t cnt = 1; cnt < data->d_size / sizeof (Elf32_Word); ++cnt)
--
2.9.3
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