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elfutils: check data_list.data.d.d_buf before free it

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[YOCTO #12791]

The one which actually saves the data is data_list.data.d.d_buf, so check it
before free rawdata_base.

This can fix a segmentation fault when prelink libqb_1.0.3:
prelink: /usr/lib/libqb.so.0.18.2: Symbol section index outside of section numbers

The segmentation fault happens when prelink call elf_end().

Fixed:
MACHINE="qemux86-64"
IMAGE_INSTALL_append = " libqb" #libqp is from meta-openembedded
$ bitbake core-image-minimal
Segmention fault

(From OE-Core rev: 560154e8525dce4beb8199ffc0d7c964da9d665a)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Robert Yang
2018-08-16 10:38:22 +08:00
committed by Richard Purdie
parent 0f327c393f
commit 1faa551931
2 changed files with 40 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
meta/recipes-devtools/elfutils/files/0001-libelf-elf_end.c-check-data_list.data.d.d_buf-before.patch
+39
View File
@@ -0,0 +1,39 @@
From d68822e93c57c3fbb77b93eada5986d2240157c2 Mon Sep 17 00:00:00 2001
From: Robert Yang <liezhi.yang@windriver.com>
Date: Thu, 16 Aug 2018 09:58:26 +0800
Subject: [PATCH] libelf/elf_end.c: check data_list.data.d.d_buf before free it
The one which actually saves the data is data_list.data.d.d_buf, so check it
before free rawdata_base.
This can fix a segmentation fault when prelink libqb_1.0.3:
prelink: /usr/lib/libqb.so.0.18.2: Symbol section index outside of section numbers
The segmentation fault happens when prelink call elf_end().
Upstream-Status: Submitted [https://sourceware.org/ml/elfutils-devel/2018-q3/msg00065.html]
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
---
libelf/elf_end.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libelf/elf_end.c b/libelf/elf_end.c
index 160f0b8..5388e80 100644
--- a/libelf/elf_end.c
+++ b/libelf/elf_end.c
@@ -165,9 +165,10 @@ elf_end (Elf *elf)
/* The section data is allocated if we couldn't mmap
the file. Or if we had to decompress. */
- if (elf->map_address == NULL
+ if ((elf->map_address == NULL
|| scn->rawdata_base == scn->zdata_base
|| (scn->flags & ELF_F_MALLOCED) != 0)
+ && (scn->data_list.data.d.d_buf != NULL))
free (scn->rawdata_base);
/* Free the list of data buffers for the section.
--
2.7.4