https://sourceware.org/bugzilla/show_bug.cgi?id=22018
Bug ID: 22018
Summary: Heap out of bounds read in
elf_i386_get_synthetic_symtab()
Product: binutils
Version: 2.29
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: fumfi.255 at gmail dot com
Target Milestone: ---
Created attachment 10374
--> https://sourceware.org/bugzilla/attachment.cgi?id=10374&action=edit
POC to trigger heap out of bounds read (objdump)
After some fuzz testing I found a crashing test case.
Version: 2.29
Command: objdump -x -Wl -R -SD objdump_hoobr_elf_i386_get_synthetic_symtab
ASAN Context:
==12394==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x6020000000f1 at pc 0x000000433332 bp 0x7ffda722aff0 sp 0x7ffda722a780
READ of size 2 at 0x6020000000f1 thread T0
#0 0x433331 in __interceptor_memcmp
/scratch/llvm/clang-4/xenial/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:690:7
#1 0x7d6af6 in elf_i386_get_synthetic_symtab
XYZ/binutils-2.29/bfd/elf32-i386.c:6393:8
#2 0x4f2875 in dump_bfd XYZ/binutils-2.29/binutils/./objdump.c:3525:20
#3 0x4f0fc0 in display_any_bfd XYZ/binutils-2.29/binutils/./objdump.c
#4 0x4f012a in display_file XYZ/binutils-2.29/binutils/./objdump.c:3713:3
#5 0x4f012a in main XYZ/binutils-2.29/binutils/./objdump.c:4015
#6 0x7fb6d9c3482f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#7 0x41a518 in _start (XYZ/binutils-2.29/binutils/objdump+0x41a518)
0x6020000000f1 is located 0 bytes to the right of 1-byte region
[0x6020000000f0,0x6020000000f1)
allocated by thread T0 here:
#0 0x4c121c in malloc
/scratch/llvm/clang-4/xenial/final/llvm.src/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:66:3
#1 0x662bb3 in bfd_malloc XYZ/binutils-2.29/bfd/libbfd.c:193:9
#2 0x4f2875 in dump_bfd XYZ/binutils-2.29/binutils/./objdump.c:3525:20
#3 0x4f0fc0 in display_any_bfd XYZ/binutils-2.29/binutils/./objdump.c
#4 0x4f012a in display_file XYZ/binutils-2.29/binutils/./objdump.c:3713:3
#5 0x4f012a in main XYZ/binutils-2.29/binutils/./objdump.c:4015
#6 0x7fb6d9c3482f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
SUMMARY: AddressSanitizer: heap-buffer-overflow
/scratch/llvm/clang-4/xenial/final/llvm.src/projects/compiler-rt/lib/asan/../sanitizer_common/sanitizer_common_interceptors.inc:690:7
in __interceptor_memcmp
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 00 fa fa fa 00 fa fa fa[01]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
==12394==ABORTING
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