[Bug binutils/27858] New: global-buffer-overflow on objdump -D

[shaohua.li at inf dot ethz.ch]

https://sourceware.org/bugzilla/show_bug.cgi?id=27858

            Bug ID: 27858
           Summary: global-buffer-overflow on objdump -D
           Product: binutils
           Version: 2.37 (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 13444
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13444&action=edit
poc

Hi there,

I found a global-buffer-overflow with AddressSanitizer (with compile flag
-fsanitize=address) in `objdump -D`. However, the poc won't crash normally
compiled binaries. I have attached the poc that triggered the
global-buffer-overflow.

Compiler: clang12

Reproduce: `objdump -D poc`

AddressSanitizer output:

==109643==ERROR: AddressSanitizer: global-buffer-overflow on address
0x000002573510 at pc 0x0000011649d4 bp 0x7ffd80a6e690 sp 0x7ffd80a6e688
READ of size 8 at 0x000002573510 thread T0
    #0 0x11649d3 in bfd_perform_relocation
/data/clean/binutils-gdb-asan/bfd/reloc.c:703:23
    #1 0x116681f in bfd_generic_get_relocated_section_contents
/data/clean/binutils-gdb-asan/bfd/reloc.c:8463:10
    #2 0x8472aa in bfd_simple_get_relocated_section_contents
/data/clean/binutils-gdb-asan/bfd/simple.c:298:14
    #3 0x4c8e58 in load_specific_debug_section
/data/clean/binutils-gdb-asan/binutils/./objdump.c:3591:13
    #4 0x4ded8d in load_separate_debug_files
/data/clean/binutils-gdb-asan/binutils/dwarf.c:11377:10
    #5 0x4caf96 in dump_bfd
/data/clean/binutils-gdb-asan/binutils/./objdump.c:4815:7
    #6 0x4cab03 in display_object_bfd
/data/clean/binutils-gdb-asan/binutils/./objdump.c
    #7 0x4cab03 in display_any_bfd
/data/clean/binutils-gdb-asan/binutils/./objdump.c:5091:5
    #8 0x4c9fb1 in display_file
/data/clean/binutils-gdb-asan/binutils/./objdump.c:5112:3
    #9 0x4c9fb1 in main
/data/clean/binutils-gdb-asan/binutils/./objdump.c:5462:6
    #10 0x7fbe70d490b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
    #11 0x41c57d in _start
(/data/clean/binutils-gdb-asan/binutils/objdump+0x41c57d)

0x000002573510 is located 1864 bytes to the right of global variable
'sh_elf_howto_table' defined in 'elf32-sh.c:73:25' (0x2570d20) of size 8360
SUMMARY: AddressSanitizer: global-buffer-overflow
/data/clean/binutils-gdb-asan/bfd/reloc.c:703:23 in bfd_perform_relocation
Shadow bytes around the buggy address:
  0x0000804a6650: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000804a6660: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000804a6670: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000804a6680: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000804a6690: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=>0x0000804a66a0: f9 f9[f9]f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000804a66b0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
  0x0000804a66c0: 00 00 00 00 00 00 00 00 00 00 00 00 04 f9 f9 f9
  0x0000804a66d0: f9 f9 f9 f9 00 02 f9 f9 f9 f9 f9 f9 00 00 00 00
  0x0000804a66e0: 00 00 07 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 06
  0x0000804a66f0: f9 f9 f9 f9 00 00 00 00 00 00 00 00 07 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
==109643==ABORTING

-- 
You are receiving this mail because:
You are on the CC list for the bug.