https://sourceware.org/bugzilla/show_bug.cgi?id=28165
Bug ID: 28165
Summary: objdump: global-buffer-overflow on
rx_info_to_howto_rela in elf32-rx.c
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 13576
--> https://sourceware.org/bugzilla/attachment.cgi?id=13576&action=edit
poc
Hi there,
I crashed `objdump -S` with a fuzzer. It's global-buffer-overflow as reported
by AddressSanitize.
- binutils version: 2.38(Head), commit af51804103a08cd1e12edc4f4a30eec2c5c4f9e8
- Compiler: clang12
- Platform: Ubuntu 18.04.5 LTS, x86_64
- Reproduce: run `objdump -S poc`
AddressSanitizer report:
==330==ERROR: AddressSanitizer: global-buffer-overflow on address
0x000002fe4450 at pc 0x000001726735 bp 0x7ffc3d23fb30 sp 0x7ffc3d23fb28
READ of size 8 at 0x000002fe4450 thread T0
#0 0x1726734 in rx_info_to_howto_rela
/binutils_latest/repo/bfd/elf32-rx.c:319:25
#1 0xcf89b0 in elf_slurp_reloc_table_from_section
/binutils_latest/repo/bfd/./elfcode.h:1523:8
#2 0xcf7eee in bfd_elf32_slurp_reloc_table
/binutils_latest/repo/bfd/./elfcode.h:1609:11
#3 0xbcf73e in _bfd_elf_canonicalize_reloc
/binutils_latest/repo/bfd/elf.c:8577:9
#4 0xae51ab in bfd_canonicalize_reloc
/binutils_latest/repo/bfd/bfd.c:1579:10
#5 0x1b4d1ba in bfd_generic_get_relocated_section_contents
/binutils_latest/repo/bfd/reloc.c:8406:17
#6 0xae653f in bfd_get_relocated_section_contents
/binutils_latest/repo/bfd/bfd.c:2166:10
#7 0xb0fe68 in bfd_simple_get_relocated_section_contents
/binutils_latest/repo/bfd/simple.c:298:14
#8 0xcab59c in read_section /binutils_latest/repo/bfd/./dwarf2.c:582:7
#9 0xca8237 in _bfd_dwarf2_slurp_debug_info
/binutils_latest/repo/bfd/./dwarf2.c:4737:13
#10 0xcac7c1 in _bfd_dwarf2_find_nearest_line
/binutils_latest/repo/bfd/./dwarf2.c:4985:9
#11 0xbd1379 in _bfd_elf_find_nearest_line
/binutils_latest/repo/bfd/elf.c:9199:7
#12 0x4e496a in show_line /binutils_latest/repo/binutils/./objdump.c:1784:9
#13 0x4e0b1f in disassemble_bytes
/binutils_latest/repo/binutils/./objdump.c:2770:6
#14 0x4dae9a in disassemble_section
/binutils_latest/repo/binutils/./objdump.c:3455:4
#15 0xb0e04a in bfd_map_over_sections
/binutils_latest/repo/bfd/section.c:1383:5
#16 0x4d1ae0 in disassemble_data
/binutils_latest/repo/binutils/./objdump.c:3599:3
#17 0x4cda84 in dump_bfd /binutils_latest/repo/binutils/./objdump.c:5006:5
#18 0x4ccb9f in display_object_bfd
/binutils_latest/repo/binutils/./objdump.c:5068:7
#19 0x4ccaa9 in display_any_bfd
/binutils_latest/repo/binutils/./objdump.c:5158:5
#20 0x4cc65c in display_file
/binutils_latest/repo/binutils/./objdump.c:5179:3
#21 0x4cb063 in main /binutils_latest/repo/binutils/./objdump.c:5529:6
#22 0x7f39a0aad0b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
#23 0x41c61d in _start (/out_bin/objdump+0x41c61d)
0x000002fe4450 is located 72 bytes to the right of global variable
'rx_elf_howto_table' defined in 'elf32-rx.c:50:25' (0x2fe2d60) 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:
0x0000805f4830: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000805f4840: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000805f4850: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000805f4860: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0000805f4870: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0000805f4880: 00 f9 f9 f9 f9 f9 f9 f9 f9 f9[f9]f9 f9 f9 f9 f9
0x0000805f4890: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000805f48a0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000805f48b0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000805f48c0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000805f48d0: 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
==330==ABORTING
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