[Bug binutils/22018] New: Heap out of bounds read in elf_i386_get_synthetic_symtab()

[fumfi.255 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22018

            Bug ID: 22018
           Summary: Heap out of bounds read in
                    elf_i386_get_synthetic_symtab()
           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 10374
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10374&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_elf_i386_get_synthetic_symtab

ASAN Context:

==12394==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x6020000000f1 at pc 0x000000433332 bp 0x7ffda722aff0 sp 0x7ffda722a780
READ of size 2 at 0x6020000000f1 thread T0
    #0 0x433331 in __interceptor_memcmp
/scratch/llvm/clang-4/xenial/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:690:7
    #1 0x7d6af6 in elf_i386_get_synthetic_symtab
XYZ/binutils-2.29/bfd/elf32-i386.c:6393:8
    #2 0x4f2875 in dump_bfd XYZ/binutils-2.29/binutils/./objdump.c:3525:20
    #3 0x4f0fc0 in display_any_bfd XYZ/binutils-2.29/binutils/./objdump.c
    #4 0x4f012a in display_file XYZ/binutils-2.29/binutils/./objdump.c:3713:3
    #5 0x4f012a in main XYZ/binutils-2.29/binutils/./objdump.c:4015
    #6 0x7fb6d9c3482f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #7 0x41a518 in _start (XYZ/binutils-2.29/binutils/objdump+0x41a518)

0x6020000000f1 is located 0 bytes to the right of 1-byte region
[0x6020000000f0,0x6020000000f1)
allocated by thread T0 here:
    #0 0x4c121c in malloc
/scratch/llvm/clang-4/xenial/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:66:3
    #1 0x662bb3 in bfd_malloc XYZ/binutils-2.29/bfd/libbfd.c:193:9
    #2 0x4f2875 in dump_bfd XYZ/binutils-2.29/binutils/./objdump.c:3525:20
    #3 0x4f0fc0 in display_any_bfd XYZ/binutils-2.29/binutils/./objdump.c
    #4 0x4f012a in display_file XYZ/binutils-2.29/binutils/./objdump.c:3713:3
    #5 0x4f012a in main XYZ/binutils-2.29/binutils/./objdump.c:4015
    #6 0x7fb6d9c3482f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)

SUMMARY: AddressSanitizer: heap-buffer-overflow
/scratch/llvm/clang-4/xenial/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:690:7
in __interceptor_memcmp
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 fd fa fa fa 00 04 fa fa 00 04 fa fa 00 04
=>0x0c047fff8010: fa fa 00 01 fa fa 00 fa fa fa 00 fa fa fa[01]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
==12394==ABORTING

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