[Bug binutils/20921] New: STRIP crashes when writing stripped file

[boehme.marcel at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20921

            Bug ID: 20921
           Summary: STRIP crashes when writing stripped file
           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 4 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
"\x08\x01\x000\x04\x00\x00\x00\x08\x00\x00\x000000\x00\x00\x00\x000000\x00\x00\x00\x00\x15\x00\x00\x00000000000000000000000000000000000"
> test
$ ./strip -S test
Segmentation fault

UBSAN says:
../../bfd/aoutx.h:1958:22: runtime error: member access within null pointer of
type 'const struct reloc_howto_type'

VALGRIND tells us:
==47599== Invalid read of size 4
==47599==    at 0x6E6A2B: aout_32_swap_std_reloc_out (aoutx.h:1961)
==47599==    by 0x6E6A2B: aout_32_squirt_out_relocs (aoutx.h:2404)
==47599==    by 0x6D27A2: i386linux_write_object_contents (i386linux.c:77)
==47599==    by 0x4F8809: bfd_close (opncls.c:733)
==47599==    by 0x42F4C7: copy_file (objcopy.c:2886)
==47599==    by 0x41670E: strip_main (objcopy.c:3788)
==47599==    by 0x41670E: main (objcopy.c:4888)
==47599==  Address 0x0 is not stack'd, malloc'd or (recently) free'd

Best regards,
- Marcel

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