[Bug binutils/21586] New: global-buffer-overflow in decode_pseudodbg_assert_0

[aadamski at quarkslab dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21586

            Bug ID: 21586
           Summary: global-buffer-overflow in decode_pseudodbg_assert_0
           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: 5ddfa2412fa85ccaec333ef01e682e5c.1a654bffa0e51502d471945837d8c8d2.min
Output: 5ddfa2412fa85ccaec333ef01e682e5c.1a654bffa0e51502d471945837d8c8d2.txt

Error in "decode_pseudodbg_assert_0": global-buffer-overflow
  in decode_pseudodbg_assert_0 at opcodes/bfin-dis.c:4604
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/opcodes/bfin-dis.c#L4604)
  in _print_insn_bfin at opcodes/bfin-dis.c:4760
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/opcodes/bfin-dis.c#L4760)
  in print_insn_bfin at opcodes/bfin-dis.c:4778
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/opcodes/bfin-dis.c#L4778)
  in disassemble_bytes at binutils/objdump.c:1864
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L1864)
  in disassemble_section at binutils/objdump.c:2309
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2309)
  in bfd_map_over_sections at bfd/section.c:1395
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/section.c#L1395)
  in disassemble_data at binutils/objdump.c:2445
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2445)
  in dump_bfd at binutils/objdump.c:3547
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3547)
  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)

Input: eaa0ea31671f33585380fa20a9e48279.3eb5986fdbd0116801326df1767e6ef0.min
Output: eaa0ea31671f33585380fa20a9e48279.3eb5986fdbd0116801326df1767e6ef0.txt

Error in "decode_pseudodbg_assert_0": global-buffer-overflow
  in decode_pseudodbg_assert_0 at opcodes/bfin-dis.c:4596
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/opcodes/bfin-dis.c#L4596)
  in _print_insn_bfin at opcodes/bfin-dis.c:4760
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/opcodes/bfin-dis.c#L4760)
  in print_insn_bfin at opcodes/bfin-dis.c:4778
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/opcodes/bfin-dis.c#L4778)
  in disassemble_bytes at binutils/objdump.c:1864
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L1864)
  in disassemble_section at binutils/objdump.c:2309
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2309)
  in bfd_map_over_sections at bfd/section.c:1395
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/bfd/section.c#L1395)
  in disassemble_data at binutils/objdump.c:2445
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L2445)
  in dump_bfd at binutils/objdump.c:3547
    (see
https://github.com/bminor/binutils-gdb/blob/561bf3e950e410fbcac06523d43039f1f58150ca/binutils/objdump.c#L3547)
  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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