[Bug binutils/26574] New: A heap buffer overflow in bfd_getl_signed_32

[15664243668 at 163 dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26574

            Bug ID: 26574
           Summary: A heap buffer overflow in bfd_getl_signed_32
           Product: binutils
           Version: 2.35
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: 15664243668 at 163 dot com
  Target Milestone: ---

Created attachment 12815
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12815&action=edit
PoC

I have found a heap buffer overflow in bfd_getl_signed_32(bfd/libbfd.c:669) by
fuzzing. The bug is triggered by
$objdump -d PoC
And the PoC file is in the attachment. I compile Binuitls 2.35 with
AddressSanitizer into x86-64 version on Ubuntu 16.04 and print the debug
information as:

=================================================================
==17081==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x61a00001f73b at pc 0x000000635efa bp 0x7ffcb01719d0 sp 0x7ffcb01719c0
READ of size 4 at 0x61a00001f73b thread T0
    #0 0x635ef9 in bfd_getl_signed_32 ../../bfd/libbfd.c:669
    #1 0x8bec2e in bfd_elf32_swap_reloca_in ../../bfd/elfcode.h:429
    #2 0x786869 in _bfd_elf_slurp_secondary_reloc_section ../../bfd/elf.c:12596
    #3 0x8c8b95 in bfd_elf32_slurp_reloc_table ../../bfd/elfcode.h:1593
    #4 0x75ac29 in _bfd_elf_canonicalize_dynamic_reloc ../../bfd/elf.c:8664
    #5 0x417426 in disassemble_data ../../binutils/objdump.c:3510
    #6 0x42d277 in dump_bfd ../../binutils/objdump.c:4912
    #7 0x4303ec in display_object_bfd ../../binutils/objdump.c:4974
    #8 0x4303ec in display_any_bfd ../../binutils/objdump.c:5064
    #9 0x41178e in display_file ../../binutils/objdump.c:5085
    #10 0x41178e in main ../../binutils/objdump.c:5433
    #11 0x7fced825082f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #12 0x415338 in _start
(/home/ubuntu/yuetai/test_programs/binutils-2.35/asan-ins/binutils/objdump+0x415338)

0x61a00001f73e is located 0 bytes to the right of 1214-byte region
[0x61a00001f280,0x61a00001f73e)
allocated by thread T0 here:
    #0 0x7fced8896602 in malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
    #1 0x6341e3 in bfd_malloc ../../bfd/libbfd.c:275

SUMMARY: AddressSanitizer: heap-buffer-overflow ../../bfd/libbfd.c:669
bfd_getl_signed_32
Shadow bytes around the buggy address:
  0x0c347fffbe90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbea0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbeb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbec0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c347fffbed0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c347fffbee0: 00 00 00 00 00 00 00[06]fa fa fa fa fa fa fa fa
  0x0c347fffbef0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c347fffbf30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==17081==ABORTING

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