https://sourceware.org/bugzilla/show_bug.cgi?id=33500
Bug ID: 33500
Summary: [BUG] A heap-buffer-overflow in
_bfd_elf_parse_eh_frame at elf-eh-frame.c:766
Product: binutils
Version: 2.46 (HEAD)
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 16390
--> https://sourceware.org/bugzilla/attachment.cgi?id=16390&action=edit
POC
## Description
- Version: Binutils latest commit 9af366e0d3b7bc5802295bb001d17483033de87b
- 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 --gc-sections --no-print-gc-sections -w $POC
## Sanitizer output
==66849==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x603000000508 at pc 0x0000007a7820 bp 0x7ffdc795f050 sp 0x7ffdc795f048
READ of size 1 at 0x603000000508 thread T0
#0 0x7a781f in _bfd_elf_parse_eh_frame
/benchmark/bin/DAFL/binutils-gdb/bfd/elf-eh-frame.c:766:8
#1 0x779cd2 in bfd_elf_gc_sections
/benchmark/bin/DAFL/binutils-gdb/bfd/elflink.c:14721:4
#2 0x511a1d in lang_gc_sections
/benchmark/bin/DAFL/binutils-gdb/ld/ldlang.c:7894:5
#3 0x50b252 in lang_process
/benchmark/bin/DAFL/binutils-gdb/ld/ldlang.c:8544:3
#4 0x53ab1b in main /benchmark/bin/DAFL/binutils-gdb/ld/./ldmain.c:875:3
#5 0x7e6ee24f3d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
#6 0x7e6ee24f3e3f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x29e3f)
#7 0x41d6c4 in _start (/benchmark/bin/DAFL/binutils-gdb/ld/ld-new+0x41d6c4)
0x603000000508 is located 0 bytes to the right of 24-byte region
[0x6030000004f0,0x603000000508)
allocated by thread T0 here:
#0 0x49919d in malloc
/src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:145:3
#1 0x5d9812 in bfd_malloc
/benchmark/bin/DAFL/binutils-gdb/bfd/libbfd.c:291:9
#2 0x5c5c3b in bfd_get_full_section_contents
/benchmark/bin/DAFL/binutils-gdb/bfd/compress.c:742:21
#3 0x6f1f53 in elf_mmap_section_contents
/benchmark/bin/DAFL/binutils-gdb/bfd/elf.c:14085:14
#4 0x6a8ff1 in _bfd_elf_mmap_section_contents
/benchmark/bin/DAFL/binutils-gdb/bfd/elf.c:14097:10
#5 0x7a5d7b in _bfd_elf_parse_eh_frame
/benchmark/bin/DAFL/binutils-gdb/bfd/elf-eh-frame.c:624:3
#6 0x779cd2 in bfd_elf_gc_sections
/benchmark/bin/DAFL/binutils-gdb/bfd/elflink.c:14721:4
#7 0x511a1d in lang_gc_sections
/benchmark/bin/DAFL/binutils-gdb/ld/ldlang.c:7894:5
#8 0x50b252 in lang_process
/benchmark/bin/DAFL/binutils-gdb/ld/ldlang.c:8544:3
#9 0x53ab1b in main /benchmark/bin/DAFL/binutils-gdb/ld/./ldmain.c:875:3
#10 0x7e6ee24f3d8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
SUMMARY: AddressSanitizer: heap-buffer-overflow
/benchmark/bin/DAFL/binutils-gdb/bfd/elf-eh-frame.c:766:8 in
_bfd_elf_parse_eh_frame
Shadow bytes around the buggy address:
0x0c067fff8050: 00 00 00 fa fa fa 00 00 00 fa fa fa 00 00 00 fa
0x0c067fff8060: fa fa 00 00 00 fa fa fa 00 00 00 fa fa fa 00 00
0x0c067fff8070: 00 fa fa fa fd fd fd fa fa fa 00 00 00 fa fa fa
0x0c067fff8080: fd fd fd fa fa fa fd fd fd fa fa fa 00 00 00 fa
0x0c067fff8090: fa fa 00 00 00 fa fa fa fd fd fd fa fa fa 00 00
=>0x0c067fff80a0: 00[fa]fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff80b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff80c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff80d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff80e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c067fff80f0: 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
==66849==ABORTING
## Credit
Reported by Yifan Zhang, [PLL](https://pl.cs.pku.edu.cn/en/)
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