Created attachment 9814 [details]
Bug triggering input
This bug was found with AFLGo, a directed version of AFL/AFLFast. Thanks also to Marcel Böhme.
This bug was found on Ubuntu 14.04 64-bit & binutils was checkout from main repository at git://sourceware.org/git/binutils-gdb.git. Its commit is 53f7e8ea7fad1fcff1b58f4cbd74e192e0bcbc1d (Fri Feb 10 00:00:16 2017)
binutils was built with ASAN using gcc-6.2 and clang-3.4. The configure command was:
CC=clang CFLAGS="-DFORTIFY_SOURCE=2 -fstack-protector-all -fsanitize=undefined,address -fno-omit-frame-pointer -g -Wno-error" ../configure --disable-shared --disable-gdb --disable-libdecnumber --disable-readline --disable-sim
Download the attached file - bug_13
readelf -p 7 bug_13
==12826== Invalid read of size 1
==12826== at 0x423674: process_section_contents (readelf.c:13097)
==12826== by 0x423674: process_object (readelf.c:16780)
==12826== by 0x402111: process_file (readelf.c:17154)
==12826== by 0x402111: main (readelf.c:17225)
==12826== Address 0x51fd5a8 is 0 bytes after a block of size 8 alloc'd
==12826== at 0x4C2CC70: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==12826== by 0x406B10: request_dump_bynumber (readelf.c:4298)
==12826== by 0x406BFA: request_dump (readelf.c:4356)
==12826== by 0x401D47: parse_args (readelf.c:4449)
==12826== by 0x401D47: main (readelf.c:17198)
==3009==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000ef58 at pc 0x4e1b6d bp 0x7ffca5290210 sp 0x7ffca5290208
READ of size 1 at 0x60200000ef58 thread T0
#0 0x4e1b6c in process_section_contents /home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/readelf.c:13097
#1 0x48d610 in process_object /home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/readelf.c:16780
#2 0x488365 in process_file /home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/readelf.c:17154
#3 0x4855c3 in main /home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/readelf.c:17225
#4 0x7f6ce7ee1f44 (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
#5 0x47ddfc in _start (/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/readelf+0x47ddfc)
The master branch has been updated by Nick Clifton <firstname.lastname@example.org>:
Author: Nick Clifton <email@example.com>
Date: Mon Feb 13 14:17:07 2017 +0000
Fix access violation when reporting sections that could not be dumped.
* readelf.c (process_section_contents): Fix off by one error
reporting un-dumped sections.
Thanks for reporting this bug. I have checked in a small patch to fix it.
The problem was an off-by-one error when reporting sections which could
not be dumped.