[Bug binutils/20892] New: Segfault in objdump

[thuanpv at comp dot nus.edu.sg]

https://sourceware.org/bugzilla/show_bug.cgi?id=20892

            Bug ID: 20892
           Summary: Segfault in objdump
           Product: binutils
           Version: 2.28 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: thuanpv at comp dot nus.edu.sg
  Target Milestone: ---

Dear all,
Using AFLFast (https://github.com/mboehme/aflfast), a fork of AFL, we found an
input causing objdump to crash. Valgrind says that it is an invalid write.

The bug was found on Ubuntu 14.04 & binutils was checked out from
https://github.com/bminor/binutils-gdb repository. Its commit is 
268ebe95201d2ebdcf68cad9dc67ff6d1e25be9e (Fri Nov 18 14:15:12 2016)

To reproduce:


printf
"\x07\x01\x00\x30\x04\x00\x00\x00\x1a\x00\x00\x00\x30\x30\x30\x30\x0d\x00\x00\x00\x30\x30\x30\x30\x04\x00\x00\x00\x40\x00\x00\x00\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x00\x00\x00\x00\x24\x30\x30\x30\x30\x30\x30\x30\x30\x04\x00\x00\x00"
> fd


objdump -x -l fd


ASAN says:
../../bfd/aoutx.h:2832:11: runtime error: store to null pointer of type 'char'


Valgrind says:
==52909== Invalid write of size 1
==52909==    at 0x7F8349: aout_32_find_nearest_line (aoutx.h:2832)
==52909==    by 0x41C8A9: dump_reloc_set (objdump.c:3162)
==52909==    by 0x41E502: dump_relocs_in_section (objdump.c:3328)
==52909==    by 0x5FB3AB: bfd_map_over_sections (section.c:1395)
==52909==    by 0x422A9E: dump_relocs (objdump.c:3337)
==52909==    by 0x422A9E: dump_bfd (objdump.c:3463)
==52909==    by 0x4234FF: display_object_bfd (objdump.c:3526)
==52909==    by 0x4234FF: display_any_bfd (objdump.c:3615)
==52909==    by 0x40CFC9: display_file (objdump.c:3636)
==52909==    by 0x40CFC9: main (objdump.c:3919)
==52909==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==52909== 
==52909== 
==52909== Process terminating with default action of signal 11 (SIGSEGV)
==52909==  Access not within mapped region at address 0x0
==52909==    at 0x7F8349: aout_32_find_nearest_line (aoutx.h:2832)
==52909==    by 0x41C8A9: dump_reloc_set (objdump.c:3162)
==52909==    by 0x41E502: dump_relocs_in_section (objdump.c:3328)
==52909==    by 0x5FB3AB: bfd_map_over_sections (section.c:1395)
==52909==    by 0x422A9E: dump_relocs (objdump.c:3337)
==52909==    by 0x422A9E: dump_bfd (objdump.c:3463)
==52909==    by 0x4234FF: display_object_bfd (objdump.c:3526)
==52909==    by 0x4234FF: display_any_bfd (objdump.c:3615)
==52909==    by 0x40CFC9: display_file (objdump.c:3636)
==52909==    by 0x40CFC9: main (objdump.c:3919)

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