https://sourceware.org/bugzilla/show_bug.cgi?id=29893
Bug ID: 29893
Summary: SEGV of objdump caused by heap-buffer-overflow at
elfcomm.c:124 in byte_get_little_endian()
Product: binutils
Version: 2.39
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: 13579and24680 at gmail dot com
Target Milestone: ---
Created attachment 14514
--> https://sourceware.org/bugzilla/attachment.cgi?id=14514&action=edit
Generated by my fuzzer and AFL_TMIN_EXACT=1 afl-tmin
# version
$ ./binutils-gdb/binutils/objdump --version
GNU objdump (GNU Binutils) 2.39.50.20221210
Copyright (C) 2022 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) any later version.
This program has absolutely no warranty.
---------------------------------------------------------------------
# make
$ git clone git://sourceware.org/git/binutils-gdb.git
$ cd binutils-gdb
$ ./configure
$ make
---------------------------------------------------------------------
# crash
$ ./binutils-gdb/binutils/objdump -W poc
poc: file format elf64-x86-64
Contents of the .eh_frame section:
00000000 0000000000000014 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 48
Data alignment factor: -8
Return address column: 16
Augmentation data: 1b
DW_CFA_def_cfa: r48 (mm7) ofs 48
DW_CFA_offset: r16 (rip) at cfa-384
DW_CFA_nop
DW_CFA_nop
00000018 0000000000000014 0000001c FDE cie=00000000
pc=000000003030aab0..000000006060dae0
DW_CFA_advance_loc: 192 to 000000003030ab70
DW_CFA_undefined: r16 (rip)
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
(... to long ignore)
79052: 0000000000
79053: 0000000000
79054: 0000000000
79055: 0000000000
79056: 0000000000
fish: Job 1, './binutils-gdb/binutils/objdump…' terminated by signal SIGSEGV
(Address boundary error)
---------------------------------------------------------------------
# ASAN report
$ ./binutils-gdb_asan_no_fuzz/binutils/objdump -W poc
poc: file format elf64-x86-64
Contents of the .eh_frame section:
00000000 0000000000000014 00000000 CIE
Version: 1
Augmentation: "zR"
Code alignment factor: 48
Data alignment factor: -8
Return address column: 16
Augmentation data: 1b
DW_CFA_def_cfa: r48 (mm7) ofs 48
DW_CFA_offset: r16 (rip) at cfa-384
DW_CFA_nop
DW_CFA_nop
00000018 0000000000000014 0000001c FDE cie=00000000
pc=000000003030aab0..000000006060dae0
DW_CFA_advance_loc: 192 to 000000003030ab70
DW_CFA_undefined: r16 (rip)
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
DW_CFA_nop
(... to long ignore)
526: 3030303030
527: 3030303030
528: 3030303030
529: 3030303030
530: 3030303030
531: 3030303030
532: 0030303030
=================================================================
==328005==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x61e000000af1 at pc 0x55c0c650c0ca bp 0x7fff74880ac0 sp 0x7fff74880ab0
READ of size 1 at 0x61e000000af1 thread T0
#0 0x55c0c650c0c9 in byte_get_little_endian
/home/a13579/fuzz_binutils-gdb/binutils-gdb_asan_no_fuzz/binutils/elfcomm.c:124
#1 0x55c0c64b15f8 in display_debug_addr dwarf.c:7740
#2 0x55c0c64748c4 in dump_dwarf_section objdump.c:4396
#3 0x55c0c65c315d in bfd_map_over_sections
/home/a13579/fuzz_binutils-gdb/binutils-gdb_asan_no_fuzz/bfd/section.c:1366
#4 0x55c0c6474af3 in dump_dwarf objdump.c:4434
#5 0x55c0c647b110 in dump_bfd objdump.c:5636
#6 0x55c0c647b4e5 in display_object_bfd objdump.c:5715
#7 0x55c0c647b816 in display_any_bfd objdump.c:5801
#8 0x55c0c647b890 in display_file objdump.c:5822
#9 0x55c0c647d1b9 in main objdump.c:6230
#10 0x7ff561d5d082 in __libc_start_main ../csu/libc-start.c:308
#11 0x55c0c646139d in _start
(/home/a13579/fuzz_binutils-gdb/binutils-gdb_asan_no_fuzz/binutils/objdump+0x13b39d)
0x61e000000af1 is located 0 bytes to the right of 2673-byte region
[0x61e000000080,0x61e000000af1)
allocated by thread T0 here:
#0 0x7ff56203e808 in __interceptor_malloc
../../../../src/libsanitizer/asan/asan_malloc_linux.cc:144
#1 0x55c0c6857b00 in xmalloc xmalloc.c:149
#2 0x55c0c64739c8 in load_specific_debug_section objdump.c:4216
#3 0x55c0c6474148 in load_debug_section objdump.c:4317
#4 0x55c0c64d0856 in load_separate_debug_files dwarf.c:11929
#5 0x55c0c647a7bd in dump_bfd objdump.c:5520
#6 0x55c0c647b4e5 in display_object_bfd objdump.c:5715
#7 0x55c0c647b816 in display_any_bfd objdump.c:5801
#8 0x55c0c647b890 in display_file objdump.c:5822
#9 0x55c0c647d1b9 in main objdump.c:6230
#10 0x7ff561d5d082 in __libc_start_main ../csu/libc-start.c:308
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/a13579/fuzz_binutils-gdb/binutils-gdb_asan_no_fuzz/binutils/elfcomm.c:124
in byte_get_little_endian
Shadow bytes around the buggy address:
0x0c3c7fff8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff8110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff8120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff8130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c3c7fff8140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c3c7fff8150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00[01]fa
0x0c3c7fff8160: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff8170: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff8180: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff8190: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c3c7fff81a0: 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
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
==328005==ABORTING
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