https://sourceware.org/bugzilla/show_bug.cgi?id=33456
Bug ID: 33456
Summary: [BUG] A heap-buffer-overflow in bfd_putl64 at
libbfd.c:989
Product: binutils
Version: 2.45
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: yfzhang23 at stu dot pku.edu.cn
Target Milestone: ---
Created attachment 16352
--> https://sourceware.org/bugzilla/attachment.cgi?id=16352&action=edit
POC
## Description
- Version: Binutils 2.45
- Environment: Ubuntu 20.04.6 LTS, Clang 12.0.0
## Steps to reproduce
export CC="clang"
export CFLAGS="-g -fsanitize=address"
./configure
make -j
./ld/ld-new --version-exports-section symbol --shared $POC
## Sanitizer output
==139072==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x62100002a4e7 at pc 0x0000005d101f bp 0x7ffe081c8260 sp 0x7ffe081c8258
WRITE of size 1 at 0x62100002a4e7 thread T0
#0 0x5d101e in bfd_putl64
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/libbfd.c:989:11
#1 0x62ee4a in elf_x86_64_finish_dynamic_symbol
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elf64-x86-64.c:5519:4
#2 0x74caa8 in elf_link_output_extsym
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elflink.c:11011:14
#3 0x5cd558 in bfd_hash_traverse
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/hash.c:814:8
#4 0x735ae2 in bfd_elf_final_link
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elflink.c:13258:3
#5 0x542fc9 in ldwrite
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/ldwrite.c:548:8
#6 0x53a80d in main
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/./ldmain.c:912:3
#7 0x7f15f1440082 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x24082)
#8 0x41d69d in _start (/benchmark/bin/DAFL/ld-new-2025-1178+0x41d69d)
0x62100002a4e7 is located 7 bytes to the right of 4064-byte region
[0x621000029500,0x62100002a4e0)
allocated by thread T0 here:
#0 0x49916d in malloc
/src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0x9d1bd2 in _objalloc_alloc
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/libiberty/./objalloc.c:159:41
#2 0x5cf4fd in bfd_alloc
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/libbfd.c:453:9
#3 0x5cf6ba in bfd_zalloc
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/libbfd.c:478:9
#4 0x79f73b in alloc_trie_leaf
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/./dwarf2.c:153:10
#5 0x79f73b in _bfd_dwarf2_slurp_debug_info
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/./dwarf2.c:5451:24
#6 0x7ad7cc in _bfd_dwarf2_find_nearest_line_with_alt
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/./dwarf2.c:5817:9
#7 0x6cd6f4 in _bfd_elf_find_nearest_line_with_alt
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elf.c:9868:7
#8 0x6cd5c1 in _bfd_elf_find_nearest_line
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elf.c:9845:10
#9 0x554f06 in vfinfo
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/ldmisc.c:335:10
#10 0x557a09 in einfo
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/ldmisc.c:608:3
#11 0x53eb5e in multiple_definition
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/./ldmain.c
#12 0x76a563 in _bfd_elf_merge_symbol
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elflink.c:1705:7
#13 0x7080e3 in elf_link_add_object_symbols
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elflink.c:5284:9
#14 0x7003a7 in bfd_elf_link_add_symbols
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/elflink.c:6416:14
#15 0x4f9770 in load_symbols
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/ldlang.c:3240:7
#16 0x516363 in open_input_bfds
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/ldlang.c:3732:13
#17 0x50b0ce in lang_process
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/ldlang.c:8323:3
#18 0x53a5b4 in main
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/ld/./ldmain.c:882:3
#19 0x7f15f1440082 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x24082)
SUMMARY: AddressSanitizer: heap-buffer-overflow
/benchmark/RUNDIR-binutils-2.45/binutils-2.45/bfd/libbfd.c:989:11 in bfd_putl64
Shadow bytes around the buggy address:
0x0c427fffd440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffd450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffd460: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffd470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c427fffd480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c427fffd490: 00 00 00 00 00 00 00 00 00 00 00 00[fa]fa fa fa
0x0c427fffd4a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffd4b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffd4c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffd4d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c427fffd4e0: 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
==139072==ABORTING
## Credit
Reported by Yifan Zhang, [PLL](https://pl.cs.pku.edu.cn/en/)
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