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From b518841fbc1431d7c5baa016e35f10fb647b5958 Mon Sep 17 00:00:00 2001
From: Mark Wielaard <mark@klomp.org>
Date: Thu, 18 Oct 2018 19:01:52 +0200
Subject: [PATCH] arlib: Check that sh_entsize isn't zero.
A bogus ELF file could have sh_entsize as zero. Don't divide by zero,
but just assume there are no symbols in the section.
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Signed-off-by: Mark Wielaard <mark@klomp.org>
CVE: CVE-2018-18521
Upstream-Status: Backport [http://sourceware.org/git/elfutils.git]
Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
---
src/arlib.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/arlib.c b/src/arlib.c
index 778e087..a6521e3 100644
--- a/src/arlib.c
+++ b/src/arlib.c
@@ -252,6 +252,9 @@ arlib_add_symbols (Elf *elf, const char *arfname, const char *membername,
if (data == NULL)
continue;
+ if (shdr->sh_entsize == 0)
+ continue;
+
int nsyms = shdr->sh_size / shdr->sh_entsize;
for (int ndx = shdr->sh_info; ndx < nsyms; ++ndx)
{
--
2.7.4
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