[Bug binutils/27840] New: heap-buffer-overflow on objdump -D

[shaohua.li at inf dot ethz.ch]

https://sourceware.org/bugzilla/show_bug.cgi?id=27840

            Bug ID: 27840
           Summary: heap-buffer-overflow on objdump -D
           Product: binutils
           Version: 2.37 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: shaohua.li at inf dot ethz.ch
  Target Milestone: ---

Created attachment 13431
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13431&action=edit
poc for `objdump -D`

Hi there,

I found heap-buffer-overflow issue on objdump (with flag -D) with a crafted
executable using a fuzzer.

The AddressSanitizer result is as follows:

==78175==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x6020000000d2 at pc 0x0000007c003c bp 0x7ffc8e42def0 sp 0x7ffc8e42dee8
READ of size 1 at 0x6020000000d2 thread T0
    #0 0x7c003b in print_insn_tic30
/data/clean/binutils-gdb/opcodes/tic30-dis.c:701:12
    #1 0x4dc181 in disassemble_bytes
/data/clean/binutils-gdb/binutils/./objdump.c:2814:20
    #2 0x4dc181 in disassemble_section
/data/clean/binutils-gdb/binutils/./objdump.c:3396:4
    #3 0x949f7b in bfd_map_over_sections
/data/clean/binutils-gdb/bfd/section.c:1377:5
    #4 0x4ce713 in disassemble_data
/data/clean/binutils-gdb/binutils/./objdump.c:3540:3
    #5 0x4ce713 in dump_bfd
/data/clean/binutils-gdb/binutils/./objdump.c:4939:5
    #6 0x4cb3d7 in display_object_bfd
/data/clean/binutils-gdb/binutils/./objdump.c
    #7 0x4cb3d7 in display_any_bfd
/data/clean/binutils-gdb/binutils/./objdump.c:5091:5
    #8 0x4ca686 in display_file
/data/clean/binutils-gdb/binutils/./objdump.c:5112:3
    #9 0x4ca686 in main /data/clean/binutils-gdb/binutils/./objdump.c:5462:6
    #10 0x7f44d088c0b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
    #11 0x41c5fd in _start (/data/clean/binutils-gdb/binutils/objdump+0x41c5fd)

0x6020000000d2 is located 0 bytes to the right of 2-byte region
[0x6020000000d0,0x6020000000d2)
allocated by thread T0 here:
    #0 0x49785d in malloc (/data/clean/binutils-gdb/binutils/objdump+0x49785d)
    #1 0x93fa23 in bfd_malloc /data/clean/binutils-gdb/bfd/libbfd.c:289:9
    #2 0x4d5a30 in disassemble_section
/data/clean/binutils-gdb/binutils/./objdump.c:3154:8
    #3 0x949f7b in bfd_map_over_sections
/data/clean/binutils-gdb/bfd/section.c:1377:5

SUMMARY: AddressSanitizer: heap-buffer-overflow
/data/clean/binutils-gdb/opcodes/tic30-dis.c:701:12 in print_insn_tic30
Shadow bytes around the buggy address:
  0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff8000: fa fa 00 01 fa fa fd fd fa fa 03 fa fa fa 03 fa
=>0x0c047fff8010: fa fa 03 fa fa fa 01 fa fa fa[02]fa fa fa fa fa
  0x0c047fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8060: 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
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  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
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==78175==ABORTING

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