[Bug binutils/26188] New: buff overflow in bfd, coff_find_nearest_line_with_names

[featherrain26 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26188

            Bug ID: 26188
           Summary: buff overflow in bfd,
                    coff_find_nearest_line_with_names
           Product: binutils
           Version: 2.35 (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 12673
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12673&action=edit
POC input

Hi, there.

There is a heap overflow in bfd modules, triggered by nm.

To reproduce, compile it with ASAN.
then run
nm -al input


Here is the trace reported by ASAN:
==118507==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x62100001dce8 at pc 0x000000785a12 bp 0x7ffda050c060 sp 0x7ffda050c050
READ of size 2 at 0x62100001dce8 thread T0
    #0 0x785a11 in coff_find_nearest_line_with_names ../../bfd/coffgen.c:2482
    #1 0x40e128 in print_symbol ../../binutils/nm.c:992
    #2 0x40f860 in print_symbols ../../binutils/nm.c:1088
    #3 0x40f860 in display_rel_file ../../binutils/nm.c:1212
    #4 0x4129ec in display_file ../../binutils/nm.c:1379
    #5 0x4081a7 in main ../../binutils/nm.c:1860
    #6 0x7f566827082f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #7 0x40a248 in _start
(/mnt/data/playground/binutils-2.34-a/build/binutils/nm-new+0x40a248)

0x62100001dce8 is located 8 bytes to the right of 4064-byte region
[0x62100001cd00,0x62100001dce0)
allocated by thread T0 here:
    #0 0x7f56688b6662 in malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98662)
    #1 0x93a8a0 in objalloc_create ../../libiberty/objalloc.c:95

SUMMARY: AddressSanitizer: heap-buffer-overflow ../../bfd/coffgen.c:2482
coff_find_nearest_line_with_names
Shadow bytes around the buggy address:
  0x0c427fffbb40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c427fffbb50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c427fffbb60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c427fffbb70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c427fffbb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c427fffbb90: 00 00 00 00 00 00 00 00 00 00 00 00 fa[fa]fa fa
  0x0c427fffbba0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c427fffbbb0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c427fffbbc0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c427fffbbd0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c427fffbbe0: 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
==118507==ABORTING

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