https://sourceware.org/bugzilla/show_bug.cgi?id=29914
Bug ID: 29914
Summary: Asan reported heap-buffer-overflow of objdump at
dwarf.c:744 in fetch_indexed_value()
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 14522
--> https://sourceware.org/bugzilla/attachment.cgi?id=14522&action=edit
Generated by my fuzzer and afl-tmin
I found a heap-buffer-overflow with my fuzzer on objdump compiled with Asan.
It didn't crash objdump compiled without Asan this time.
---------------------------------------------------------------------
# version
$ ./binutils-gdb_asan/binutils/objdump --version
GNU objdump (GNU Binutils) 2.39.50.20221216
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.
---------------------------------------------------------------------
# git log
$ git log --oneline -1
fa501b69309 (HEAD -> master, origin/master, origin/HEAD) Fix a potential
illegal memory access when parsing corrupt DWARF information.
---------------------------------------------------------------------
# make
$ git clone git://sourceware.org/git/binutils-gdb.git
$ cd binutils-gdb
$ ./configure CFLAGS='-fsanitize=address -g3' CXXFALGS='-fsanitize=address -g3'
$ make
---------------------------------------------------------------------
# ASAN report
$ ./binutils-gdb_asan/binutils/objdump -W poc
./binutils-gdb_asan/binutils/objdump: warning: poc has a section extending past
end of file
=================================================================
==2765629==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x6020000000b1 at pc 0x55a51efcd89b bp 0x7ffdbdd5d8e0 sp 0x7ffdbdd5d8d0
READ of size 1 at 0x6020000000b1 thread T0
#0 0x55a51efcd89a in byte_get_little_endian
/home/a13579/fuzz_binutils-gdb/binutils-gdbnew/binutils-gdb_asan/binutils/elfcomm.c:119
#1 0x55a51ef40ca3 in fetch_indexed_value dwarf.c:744
#2 0x55a51ef4e156 in read_and_display_attr_value dwarf.c:2879
#3 0x55a51ef50363 in read_and_display_attr dwarf.c:3443
#4 0x55a51ef53f4d in process_debug_info dwarf.c:4044
#5 0x55a51ef91ad9 in load_separate_debug_files dwarf.c:11982
#6 0x55a51ef3b95b in dump_bfd objdump.c:5520
#7 0x55a51ef3c688 in display_object_bfd objdump.c:5715
#8 0x55a51ef3c9b9 in display_any_bfd objdump.c:5801
#9 0x55a51ef3ca33 in display_file objdump.c:5822
#10 0x55a51ef3e36d in main objdump.c:6230
#11 0x7f123ccf7082 in __libc_start_main ../csu/libc-start.c:308
#12 0x55a51ef2239d in _start
(/home/a13579/fuzz_binutils-gdb/binutils-gdbnew/binutils-gdb_asan/binutils/objdump+0x13b39d)
0x6020000000b1 is located 0 bytes to the right of 1-byte region
[0x6020000000b0,0x6020000000b1)
allocated by thread T0 here:
#0 0x7f123cfd8808 in __interceptor_malloc
../../../../src/libsanitizer/asan/asan_malloc_linux.cc:144
#1 0x55a51f31d620 in xmalloc xmalloc.c:149
#2 0x55a51ef34b25 in load_specific_debug_section objdump.c:4216
#3 0x55a51ef352a6 in load_debug_section objdump.c:4317
#4 0x55a51ef91aa0 in load_separate_debug_files dwarf.c:11976
#5 0x55a51ef3b95b in dump_bfd objdump.c:5520
#6 0x55a51ef3c688 in display_object_bfd objdump.c:5715
#7 0x55a51ef3c9b9 in display_any_bfd objdump.c:5801
#8 0x55a51ef3ca33 in display_file objdump.c:5822
#9 0x55a51ef3e36d in main objdump.c:6230
#10 0x7f123ccf7082 in __libc_start_main ../csu/libc-start.c:308
SUMMARY: AddressSanitizer: heap-buffer-overflow
/home/a13579/fuzz_binutils-gdb/binutils-gdbnew/binutils-gdb_asan/binutils/elfcomm.c:119
in byte_get_little_endian
Shadow bytes around the buggy address:
0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c047fff8000: fa fa fd fa fa fa 00 04 fa fa 00 04 fa fa 00 04
=>0x0c047fff8010: fa fa 00 01 fa fa[01]fa fa fa fa fa fa fa fa fa
0x0c047fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8060: 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
==2765629==ABORTING
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