[Bug binutils/20929] New: STRIP crashes when closing the output bfd after copying

[boehme.marcel at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20929

            Bug ID: 20929
           Summary: STRIP crashes when closing the output bfd after
                    copying
           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 would also like to 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
"\x08\x01\x000\x00\x00\x00\x00\x08\x00\x00\x000000\x00\x00\x00\x000000\x00\x00\x00\x00\x15\x00\x00\x00000000000000\x00\x00\x00\x080000000000000"
> test
$ strip -S test
Segmentation fault

==140780== Invalid read of size 8
==140780==    at 0x6E5FF7: aout_32_swap_std_reloc_out (aoutx.h:1949)
==140780==    by 0x6E5FF7: aout_32_squirt_out_relocs (aoutx.h:2422)
==140780==    by 0x6D1D32: i386linux_write_object_contents (i386linux.c:77)
==140780==    by 0x4F8A19: bfd_close (opncls.c:733)
==140780==    by 0x42F6D7: copy_file (objcopy.c:2886)
==140780==    by 0x416CEE: strip_main (objcopy.c:3790)
==140780==    by 0x416CEE: main (objcopy.c:4890)
==140780==  Address 0x0 is not stack'd, malloc'd or (recently) free'd

Best regards,
- Marcel

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