https://sourceware.org/bugzilla/show_bug.cgi?id=27858
Bug ID: 27858
Summary: global-buffer-overflow on objdump -D
Product: binutils
Version: 2.37 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: shaohua.li at inf dot ethz.ch
Target Milestone: ---
Created attachment 13444
--> https://sourceware.org/bugzilla/attachment.cgi?id=13444&action=edit
poc
Hi there,
I found a global-buffer-overflow with AddressSanitizer (with compile flag
-fsanitize=address) in `objdump -D`. However, the poc won't crash normally
compiled binaries. I have attached the poc that triggered the
global-buffer-overflow.
Compiler: clang12
Reproduce: `objdump -D poc`
AddressSanitizer output:
==109643==ERROR: AddressSanitizer: global-buffer-overflow on address
0x000002573510 at pc 0x0000011649d4 bp 0x7ffd80a6e690 sp 0x7ffd80a6e688
READ of size 8 at 0x000002573510 thread T0
#0 0x11649d3 in bfd_perform_relocation
/data/clean/binutils-gdb-asan/bfd/reloc.c:703:23
#1 0x116681f in bfd_generic_get_relocated_section_contents
/data/clean/binutils-gdb-asan/bfd/reloc.c:8463:10
#2 0x8472aa in bfd_simple_get_relocated_section_contents
/data/clean/binutils-gdb-asan/bfd/simple.c:298:14
#3 0x4c8e58 in load_specific_debug_section
/data/clean/binutils-gdb-asan/binutils/./objdump.c:3591:13
#4 0x4ded8d in load_separate_debug_files
/data/clean/binutils-gdb-asan/binutils/dwarf.c:11377:10
#5 0x4caf96 in dump_bfd
/data/clean/binutils-gdb-asan/binutils/./objdump.c:4815:7
#6 0x4cab03 in display_object_bfd
/data/clean/binutils-gdb-asan/binutils/./objdump.c
#7 0x4cab03 in display_any_bfd
/data/clean/binutils-gdb-asan/binutils/./objdump.c:5091:5
#8 0x4c9fb1 in display_file
/data/clean/binutils-gdb-asan/binutils/./objdump.c:5112:3
#9 0x4c9fb1 in main
/data/clean/binutils-gdb-asan/binutils/./objdump.c:5462:6
#10 0x7fbe70d490b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
#11 0x41c57d in _start
(/data/clean/binutils-gdb-asan/binutils/objdump+0x41c57d)
0x000002573510 is located 1864 bytes to the right of global variable
'sh_elf_howto_table' defined in 'elf32-sh.c:73:25' (0x2570d20) of size 8360
SUMMARY: AddressSanitizer: global-buffer-overflow
/data/clean/binutils-gdb-asan/bfd/reloc.c:703:23 in bfd_perform_relocation
Shadow bytes around the buggy address:
0x0000804a6650: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000804a6660: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000804a6670: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000804a6680: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000804a6690: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
=>0x0000804a66a0: f9 f9[f9]f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000804a66b0: f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9 f9
0x0000804a66c0: 00 00 00 00 00 00 00 00 00 00 00 00 04 f9 f9 f9
0x0000804a66d0: f9 f9 f9 f9 00 02 f9 f9 f9 f9 f9 f9 00 00 00 00
0x0000804a66e0: 00 00 07 f9 f9 f9 f9 f9 00 00 00 00 00 00 00 06
0x0000804a66f0: f9 f9 f9 f9 00 00 00 00 00 00 00 00 07 f9 f9 f9
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
==109643==ABORTING
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