[Bug binutils/20923] New: STRIP crashes when marking symbols used in relocation

[boehme.marcel at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20923

            Bug ID: 20923
           Summary: STRIP crashes when marking symbols used in relocation
           Product: binutils
           Version: 2.28 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: boehme.marcel at gmail dot com
  Target Milestone: ---

Dear all,

The following bug was found with AFLFast, a fork of AFL, in a 24 hour fuzzing
session on Binutils. Thanks also to Van-Thuan Pham. We also thank Nick Clifton
for addressing our reported bugs so promptly.

Objcopy/Strip crashes with an invalid read of size 8 for the following
execution on Ubuntu 16.04 x86_64 in Binutils trunk and for preinstalled version
v2.26.1 and on Ubuntu 14.04 x86_64 for Binutils in trunk and preinstalled
version v2.24.

$ printf
"\xcc\x00\x000\x00\x00\x00\x00\x00\x00\x00\x000000\x00\x00\x00\x0000000\x00\x00\x00\x00\x00\x0000000000000000000"
> test
$ ./strip -S test
Segmentation fault

UBSAN shows us:
../../binutils/objcopy.c:3554:11: runtime error: load of null pointer of type
'struct bfd_symbol *'

Valgrind reports:
==89005== Invalid read of size 8
==89005==    at 0x41C22F: mark_symbols_used_in_relocations (objcopy.c:3554)
==89005==    by 0x503843: bfd_map_over_sections (section.c:1395)
==89005==    by 0x427713: copy_object.part.18 (objcopy.c:2398)
==89005==    by 0x42F435: copy_object (objcopy.c:1849)
==89005==    by 0x42F435: copy_file (objcopy.c:2879)
==89005==    by 0x41670E: strip_main (objcopy.c:3788)
==89005==    by 0x41670E: main (objcopy.c:4888)
==89005==  Address 0x0 is not stack'd, malloc'd or (recently) free'd

Best regards,
- Marcel

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