[Bug binutils/21581] New: stack-buffer-overflow in bfd_get_string

[aadamski at quarkslab dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21581

            Bug ID: 21581
           Summary: stack-buffer-overflow in bfd_get_string
           Product: binutils
           Version: 2.29 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: aadamski at quarkslab dot com
  Target Milestone: ---

Hello there,

I have been fuzzing objdump with American Fuzzy Lop and AddressSanitizer.

Please find attached the minimized file causing the issue ("Input") and the
ASAN report log ("Output"). Below is the reduced stacktrace with links to the
corresponding source lines on a GitHub mirror.

The command I used was `objdump -D <file>`.

Let me know if there is any additional information I can provide.

--

Input: 02d8fa874391d563ccfd5911ff5f5cf8.fe651c9b03ff955c157ecee745208476.min
Output: 02d8fa874391d563ccfd5911ff5f5cf8.fe651c9b03ff955c157ecee745208476.txt

Error in "bfd_get_string": stack-buffer-overflow
  in bfd_get_string at bfd/ieee.c:198
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/ieee.c#L198)
  in read_id at bfd/ieee.c:227
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/ieee.c#L227)
  in ieee_object_p at bfd/ieee.c:1907
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/ieee.c#L1907)
  in bfd_check_format_matches at bfd/format.c:311
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/format.c#L311)
  in display_object_bfd at binutils/objdump.c:3602
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3602)
  in display_any_bfd at binutils/objdump.c:3693
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3693)
  in display_file at binutils/objdump.c:3714
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3714)
  in main at binutils/objdump.c:4016
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L4016)

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