[Bug binutils/28178] New: global-buffer-overflow on `nm-new -l`

[shaohua.li at inf dot ethz.ch]

https://sourceware.org/bugzilla/show_bug.cgi?id=28178

            Bug ID: 28178
           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 13587
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13587&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:

==668==ERROR: AddressSanitizer: global-buffer-overflow on address
0x000001828d10 at pc 0x0000011250a5 bp 0x7fffbb5830d0 sp 0x7fffbb5830c8
READ of size 8 at 0x000001828d10 thread T0
    #0 0x11250a4 in rx_info_to_howto_rela
/binutils_latest/repo/bfd/elf32-rx.c:319:25
    #1 0x6f7320 in elf_slurp_reloc_table_from_section
/binutils_latest/repo/bfd/./elfcode.h:1523:8
    #2 0x6f685e in bfd_elf32_slurp_reloc_table
/binutils_latest/repo/bfd/./elfcode.h:1609:11
    #3 0x5ce0ae in _bfd_elf_canonicalize_reloc
/binutils_latest/repo/bfd/elf.c:8577:9
    #4 0x4e96db in bfd_canonicalize_reloc
/binutils_latest/repo/bfd/bfd.c:1579:10
    #5 0x4d2276 in get_relocs /binutils_latest/repo/binutils/nm.c:913:25
    #6 0x50e6ba in bfd_map_over_sections
/binutils_latest/repo/bfd/section.c:1383:5
    #7 0x4d147a in print_symbol /binutils_latest/repo/binutils/nm.c:1037:8
    #8 0x4ceaeb in print_symbols /binutils_latest/repo/binutils/nm.c:1152:7
    #9 0x4cd23c in display_rel_file /binutils_latest/repo/binutils/nm.c:1279:5
    #10 0x4c97dd in display_file /binutils_latest/repo/binutils/nm.c:1446:7
    #11 0x4c90db in main /binutils_latest/repo/binutils/nm.c:1965:12
    #12 0x7fb5125b10b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
    #13 0x41c55d in _start (/out_bin/nm-new+0x41c55d)

0x000001828d10 is located 72 bytes to the right of global variable
'rx_elf_howto_table' defined in 'elf32-rx.c:50:25' (0x1827620) of size 5800
SUMMARY: AddressSanitizer: global-buffer-overflow
/binutils_latest/repo/bfd/elf32-rx.c:319:25 in rx_info_to_howto_rela
Shadow bytes around the buggy address:
  0x0000802fd150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000802fd160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000802fd170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000802fd180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0000802fd190: 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9
=>0x0000802fd1a0: f9 f9[f9]f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802fd1b0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802fd1c0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802fd1d0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802fd1e0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000802fd1f0: 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
==668==ABORTING

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