[Bug binutils/24911] New: Heap overflow issue in qsort_r, dwarf.c

[featherrain26 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24911

            Bug ID: 24911
           Summary: Heap overflow issue in qsort_r, dwarf.c
           Product: binutils
           Version: 2.33 (HEAD)
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: featherrain26 at gmail dot com
  Target Milestone: ---

Created attachment 11951
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11951&action=edit
PoC input

Hi, there.

There is a heap overflow issue in dwarf.c.

The environment and flag are:
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.6 LTS
Release:        16.04
Codename:       xenial
gcc: 5.4.0

CFLAG="-g -O0 -m32 -fsanitize=address,leak,undefined" 

The reproduce command is:
readelf -agteSdcWw --dyn-syms -D poc

==109875==ERROR: AddressSanitizer: heap-buffer-overflow on address 0xf44009ec
at pc 0x08106241 bp 0xffc13fb8 sp 0xffc13fa8
READ of size 8 at 0xf44009ec thread T0
    #0 0x8106240 in comp_addr_base
/mnt/data/playground/binutils-2.32-a/binutils/dwarf.c:6475
    #1 0xf6ff2d28  (/lib/i386-linux-gnu/libc.so.6+0x2dd28)
    #2 0xf6ff3023 in qsort_r (/lib/i386-linux-gnu/libc.so.6+0x2e023)
    #3 0xf6ff30e9 in qsort (/lib/i386-linux-gnu/libc.so.6+0x2e0e9)
    #4 0x813c04f in display_debug_addr
/mnt/data/playground/binutils-2.32-a/binutils/dwarf.c:6526
    #5 0x80a2f3a in display_debug_section
/mnt/data/playground/binutils-2.32-a/binutils/readelf.c:13945
    #6 0x80a2f3a in process_section_contents
/mnt/data/playground/binutils-2.32-a/binutils/readelf.c:14036
    #7 0x80fa70d in process_section_contents
/mnt/data/playground/binutils-2.32-a/binutils/readelf.c:19286
    #8 0x80fa70d in process_object
/mnt/data/playground/binutils-2.32-a/binutils/readelf.c:19285
    #9 0x804ba13 in process_file
/mnt/data/playground/binutils-2.32-a/binutils/readelf.c:19708
    #10 0x804ba13 in main
/mnt/data/playground/binutils-2.32-a/binutils/readelf.c:19767
    #11 0xf6fdd636 in __libc_start_main (/lib/i386-linux-gnu/libc.so.6+0x18636)
    #12 0x804c6eb 
(/mnt/data/playground/binutils-2.32-a/binutils/readelf+0x804c6eb)

0xf44009ec is located 4 bytes to the right of 24-byte region
[0xf44009d0,0xf44009e8)
allocated by thread T0 here:
    #0 0xf7211f8e in calloc (/usr/lib32/libasan.so.2+0x96f8e)
    #1 0x81a90fe in xcalloc xmalloc.c:162

SUMMARY: AddressSanitizer: heap-buffer-overflow
/mnt/data/playground/binutils-2.32-a/binutils/dwarf.c:6475 comp_addr_base
Shadow bytes around the buggy address:
  0x3e8800e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3e8800f0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3e880100: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3e880110: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x3e880120: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x3e880130: fa fa fa fa fa fa fa fa fa fa 00 00 00[fa]fa fa
  0x3e880140: fd fd fd fa fa fa 00 00 00 fa fa fa fd fd fd fa
  0x3e880150: fa fa fd fd fd fa fa fa 00 00 00 fa fa fa fd fd
  0x3e880160: fd fa fa fa fd fd fd fa fa fa 00 00 00 04 fa fa
  0x3e880170: 00 00 00 04 fa fa 00 00 00 fa fa fa 00 00 05 fa
  0x3e880180: 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
==109875==ABORTING

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