https://sourceware.org/bugzilla/show_bug.cgi?id=33502
Bug ID: 33502
Summary: [BUG] A SEGV in elf_x86_64_relocate_section at
elf64-x86-64.c:4507
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 16393
--> https://sourceware.org/bugzilla/attachment.cgi?id=16393&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
==67406==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x62900000f1fb at pc 0x000000633818 bp 0x7ffeb5ab80d0 sp 0x7ffeb5ab80c8
READ of size 1 at 0x62900000f1fb thread T0
#0 0x633817 in elf_x86_64_relocate_section
/benchmark/bin/DAFL/binutils-gdb/bfd/elf64-x86-64.c:4507:24
#1 0x7628ec in elf_link_input_bfd
/benchmark/bin/DAFL/binutils-gdb/bfd/elflink.c:11963:10
#2 0x7547ff in bfd_elf_final_link
/benchmark/bin/DAFL/binutils-gdb/bfd/elflink.c:13222:11
#3 0x542f2e in ldwrite /benchmark/bin/DAFL/binutils-gdb/ld/ldwrite.c:548:8
#4 0x53acdf in main /benchmark/bin/DAFL/binutils-gdb/ld/./ldmain.c:905:3
#5 0x785f1333ed8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
#6 0x785f1333ee3f 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)
0x62900000f1fb is located 5 bytes to the left of 16384-byte region
[0x62900000f200,0x629000013200)
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 0x75356a in bfd_elf_final_link
/benchmark/bin/DAFL/binutils-gdb/bfd/elflink.c:13097:38
#3 0x542f2e in ldwrite /benchmark/bin/DAFL/binutils-gdb/ld/ldwrite.c:548:8
#4 0x53acdf in main /benchmark/bin/DAFL/binutils-gdb/ld/./ldmain.c:905:3
#5 0x785f1333ed8f (/lib/x86_64-linux-gnu/libc.so.6+0x29d8f)
SUMMARY: AddressSanitizer: heap-buffer-overflow
/benchmark/bin/DAFL/binutils-gdb/bfd/elf64-x86-64.c:4507:24 in
elf_x86_64_relocate_section
Shadow bytes around the buggy address:
0x0c527fff9de0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff9df0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff9e00: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff9e10: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
0x0c527fff9e20: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0c527fff9e30: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
0x0c527fff9e40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff9e50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff9e60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff9e70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0x0c527fff9e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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
==67406==ABORTING
## Credit
Reported by Yifan Zhang, [PLL](https://pl.cs.pku.edu.cn/en/)
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