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[Bug gas/23453] New: segmentation fault in config/tc-i386.c, line 3989


From: bugs at feusi dot co
Subject: [Bug gas/23453] New: segmentation fault in config/tc-i386.c, line 3989
Date: Thu, 26 Jul 2018 08:14:56 +0000

https://sourceware.org/bugzilla/show_bug.cgi?id=23453

            Bug ID: 23453
           Summary: segmentation fault in config/tc-i386.c, line 3989
           Product: binutils
           Version: 2.32 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: bugs at feusi dot co
  Target Milestone: ---

Created attachment 11153
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11153&action=edit
File which causes segfault

Hi,
I am working on a project in which I use the honggfuzz fuzzer to find bugs in
open-source software and I decided to fuzz gas. In doing so, I discovered a
segmentation fault in config/tc-i386.c, line 3989. Following is a detailed
backtrace, as supplied by the address sanitizer:

ASAN:DEADLYSIGNAL
=================================================================
==47033==ERROR: AddressSanitizer: SEGV on unknown address 0x55d1308f2630 (pc
0x7f7e731472c5 bp 0x7ffc7b39ab50 sp 0x7ffc7b39ab00 T0)
==47033==The signal is caused by a WRITE memory access.
    #0 0x7f7e731472c4  (/usr/lib/x86_64-linux-gnu/libasan.so.4+0x262c4)
    #1 0x7f7e731fa8a3 in __interceptor_free
(/usr/lib/x86_64-linux-gnu/libasan.so.4+0xd98a3)
    #2 0x55d13006afe5 in md_assemble config/tc-i386.c:3989
    #3 0x55d12ff9ebb6 in assemble_one
/home/jfe/binutils-gdb-noasan/gas/read.c:711
    #4 0x55d12ff9ebb6 in read_a_source_file
/home/jfe/binutils-gdb-noasan/gas/read.c:1179
    #5 0x55d12fec0bb9 in perform_an_assembly_pass
/home/jfe/binutils-gdb-noasan/gas/as.c:1187
    #6 0x55d12fec0bb9 in main /home/jfe/binutils-gdb-noasan/gas/as.c:1331
    #7 0x7f7e72b84a86 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x21a86)
    #8 0x55d12fec4db9 in _start
(/home/jfe/binutils-gdb-noasan/gas/as-new+0x117db9)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
(/usr/lib/x86_64-linux-gnu/libasan.so.4+0x262c4) 
==47033==ABORTING

To reproduce this bug, run "gas /dev/stdin -o /dev/null<min", where min is the
file attached.

cheers
project-repo

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