[Bug binutils/22956] New: Heap out of bounds read in pex64_get_unwind_info()

[fumfi.255 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22956

            Bug ID: 22956
           Summary: Heap out of bounds read in pex64_get_unwind_info()
           Product: binutils
           Version: 2.30
            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 10890
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10890&action=edit
Crashing test case (objdump)

After some fuzz testing I found a crashing test case.

Version: 2.30

Command: objdump -x -D -S -s -G -g -e -t -T -r -R
objdump_hoobr_pex64_get_unwind_info

ASAN Context:
==20442==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60e00000dff7 at pc 0x000000977e90 bp 0x7fffdace5b80 sp 0x7fffdace5b70
READ of size 1 at 0x60e00000dff7 thread T0
    #0 0x977e8f in pex64_get_unwind_info
XYZ/binutils-2.30.0/bfd/pei-x86_64.c:113
    #1 0x977e8f in pex64_dump_xdata XYZ/binutils-2.30.0/bfd/pei-x86_64.c:348
    #2 0x977e8f in pex64_bfd_print_pdata_section
XYZ/binutils-2.30.0/bfd/pei-x86_64.c:720
    #3 0x97887d in pex64_print_all_pdata_sections
XYZ/binutils-2.30.0/bfd/pei-x86_64.c:745
    #4 0x61c56b in bfd_map_over_sections XYZ/binutils-2.30.0/bfd/section.c:1397
    #5 0x9787e9 in pex64_bfd_print_pdata
XYZ/binutils-2.30.0/bfd/pei-x86_64.c:759
    #6 0x99abcd in _bfd_pex64_print_private_bfd_data_common
XYZ/binutils-2.30.0/bfd/pex64igen.c:2908
    #7 0x963640 in pe_print_private_bfd_data
XYZ/binutils-2.30.0/bfd/peicode.h:336
    #8 0x42009c in dump_bfd_private_header objdump.c:2966
    #9 0x42009c in dump_bfd objdump.c:3559
    #10 0x421a77 in display_object_bfd objdump.c:3658
    #11 0x421a77 in display_any_bfd objdump.c:3747
    #12 0x40ea81 in display_file objdump.c:3768
    #13 0x40ea81 in main objdump.c:4070
    #14 0x7fd3b68ca82f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #15 0x411ca8 in _start (/usr/local/bin/objdump+0x411ca8)

0x60e00000dff7 is located 0 bytes to the right of 151-byte region
[0x60e00000df60,0x60e00000dff7)
allocated by thread T0 here:
    #0 0x7fd3b6f10602 in malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
    #1 0x601d1a in bfd_malloc XYZ/binutils-2.30.0/bfd/libbfd.c:193
    #2 0x61200000bfb7  (<unknown module>)

SUMMARY: AddressSanitizer: heap-buffer-overflow
XYZ/binutils-2.30.0/bfd/pei-x86_64.c:113 pex64_get_unwind_info
Shadow bytes around the buggy address:
  0x0c1c7fff9ba0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9bb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9bc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9bd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9be0: fa fa fa fa fa fa fa fa fa fa fa fa 00 00 00 00
=>0x0c1c7fff9bf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[07]fa
  0x0c1c7fff9c00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9c10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9c20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9c30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c1c7fff9c40: 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
==20442==ABORTING

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