[Bug binutils/28173] New: global-buffer-overflow on `nm-new -l`

[shaohua.li at inf dot ethz.ch]

https://sourceware.org/bugzilla/show_bug.cgi?id=28173

            Bug ID: 28173
           Summary: global-buffer-overflow on `nm-new -l`
           Product: binutils
           Version: 2.38 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: shaohua.li at inf dot ethz.ch
  Target Milestone: ---

Created attachment 13583
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13583&action=edit
poc

Hi there,

I found a global-buffer-overflow on `nm-new -l` with a fuzzer.

- binutils version: 2.38(Head), commit af51804103a08cd1e12edc4f4a30eec2c5c4f9e8
- Compiler: clang12
- Platform: Ubuntu 18.04.5 LTS, x86_64
- Reproduce: run `nm-new -l poc`

AddressSanitizer report:

==579==ERROR: AddressSanitizer: global-buffer-overflow on address
0x000001803680 at pc 0x00000154b64f bp 0x7ffd4825bef0 sp 0x7ffd4825bee8
READ of size 8 at 0x000001803680 thread T0
    #0 0x154b64e in bfd_perform_relocation
/binutils_latest/repo/bfd/reloc.c:703:23
    #1 0x103eb10 in nds32_elf_get_relocated_section_contents
/binutils_latest/repo/bfd/elf32-nds32.c:13100:10
    #2 0x4eaa6f in bfd_get_relocated_section_contents
/binutils_latest/repo/bfd/bfd.c:2166:10
    #3 0x1551708 in bfd_simple_get_relocated_section_contents
/binutils_latest/repo/bfd/simple.c:298:14
    #4 0x6a9f0c in read_section /binutils_latest/repo/bfd/./dwarf2.c:582:7
    #5 0x6a6ba7 in _bfd_dwarf2_slurp_debug_info
/binutils_latest/repo/bfd/./dwarf2.c:4737:13
    #6 0x6ab131 in _bfd_dwarf2_find_nearest_line
/binutils_latest/repo/bfd/./dwarf2.c:4985:9
    #7 0x5d0246 in _bfd_elf_find_line /binutils_latest/repo/bfd/elf.c:9241:10
    #8 0x4d1ba0 in print_symbol /binutils_latest/repo/binutils/nm.c:1071:9
    #9 0x4ceaeb in print_symbols /binutils_latest/repo/binutils/nm.c:1152:7
    #10 0x4cd23c in display_rel_file /binutils_latest/repo/binutils/nm.c:1279:5
    #11 0x4c97dd in display_file /binutils_latest/repo/binutils/nm.c:1446:7
    #12 0x4c90db in main /binutils_latest/repo/binutils/nm.c:1965:12
    #13 0x7f8b6c5b20b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #14 0x41c55d in _start (/out_bin/nm-new+0x41c55d)

0x000001803680 is located 224 bytes to the right of global variable
'nds32_elf_howto_table' defined in 'elf32-nds32.c:271:25' (0x1802240) of size
4960
SUMMARY: AddressSanitizer: global-buffer-overflow
/binutils_latest/repo/bfd/reloc.c:703:23 in bfd_perform_relocation
Shadow bytes around the buggy address:
  0x0000802f8680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000802f8690: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000802f86a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000802f86b0: 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802f86c0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=>0x0000802f86d0:[f9]f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802f86e0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802f86f0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802f8700: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802f8710: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802f8720: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
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
  Shadow gap:              cc
==579==ABORTING

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