[Bug binutils/22047] New: Heap out of bounds read in parse_comp_unit()

[fumfi.255 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22047

            Bug ID: 22047
           Summary: Heap out of bounds read in parse_comp_unit()
           Product: binutils
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: fumfi.255 at gmail dot com
  Target Milestone: ---

Created attachment 10377
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10377&action=edit
POC to trigger heap out of bounds read (objdump)

After some fuzz testing I found a crashing test case.

Version: 2.29

Command: objdump -x -Wl -R -SD objdump_hoobr_parse_comp_unit

ASAN:

==15019==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60400000dc00 at pc 0x000000428212 bp 0x7ffc49ab82d0 sp 0x7ffc49ab7a78
READ of size 35 at 0x60400000dc00 thread T0
    #0 0x428211 in __interceptor_index
/home/llvm/clang-3.9/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:468:5
    #1 0x7c6fbd in parse_comp_unit XYZ/binutils-2.29/bfd/./dwarf2.c:3453:14
    #2 0x7c6fbd in _bfd_dwarf2_find_nearest_line
XYZ/binutils-2.29/bfd/./dwarf2.c:4696
    #3 0x7148fb in _bfd_elf_find_nearest_line
XYZ/binutils-2.29/bfd/elf.c:8636:7
    #4 0x4f6709 in show_line XYZ/binutils-2.29/binutils/./objdump.c:1486:9
    #5 0x4f6709 in disassemble_bytes
XYZ/binutils-2.29/binutils/./objdump.c:1791
    #6 0x4f6709 in disassemble_section
XYZ/binutils-2.29/binutils/./objdump.c:2313
    #7 0x66e1d9 in bfd_map_over_sections XYZ/binutils-2.29/bfd/section.c:1395:5
    #8 0x4ebd50 in disassemble_data
XYZ/binutils-2.29/binutils/./objdump.c:2449:3
    #9 0x4ebd50 in dump_bfd XYZ/binutils-2.29/binutils/./objdump.c:3546
    #10 0x4e8be1 in display_object_bfd
XYZ/binutils-2.29/binutils/./objdump.c:3603:7
    #11 0x4e8be1 in display_any_bfd XYZ/binutils-2.29/binutils/./objdump.c:3692
    #12 0x4e7d5a in display_file XYZ/binutils-2.29/binutils/./objdump.c:3713:3
    #13 0x4e7d5a in main XYZ/binutils-2.29/binutils/./objdump.c:4015
    #14 0x7f485fa5882f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #15 0x419d98 in _start (XYZ/binutils-2.29/binutils/objdump+0x419d98)

0x60400000dc00 is located 0 bytes to the right of 48-byte region
[0x60400000dbd0,0x60400000dc00)
allocated by thread T0 here:
    #0 0x4b85ac in malloc
/home/llvm/clang-3.9/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:64:3
    #1 0x6618b3 in bfd_malloc XYZ/binutils-2.29/bfd/libbfd.c:193:9
    #2 0x66f01b in bfd_simple_get_relocated_section_contents
XYZ/binutils-2.29/bfd/simple.c:193:12
    #3 0x7bba33 in read_section XYZ/binutils-2.29/bfd/./dwarf2.c:556:8

SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/llvm/clang-3.9/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:468:5
in __interceptor_index
Shadow bytes around the buggy address:
  0x0c087fff9b30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9b40: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9b50: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9b60: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00 00
  0x0c087fff9b70: fa fa 00 00 00 00 00 00 fa fa 00 00 00 00 00 00
=>0x0c087fff9b80:[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9b90: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9ba0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c087fff9bb0: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00 05
  0x0c087fff9bc0: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00 00
  0x0c087fff9bd0: 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
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==15019==ABORTING

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