https://sourceware.org/bugzilla/show_bug.cgi?id=26166
Bug ID: 26166
Summary: Heap user after free in nm
Product: binutils
Version: 2.35 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: featherrain26 at gmail dot com
Target Milestone: ---
Created attachment 12656
--> https://sourceware.org/bugzilla/attachment.cgi?id=12656&action=edit
POC input
Hi,
There is a heap oaf in nm, bfd module.
Here is my environment
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.6 LTS"
To reproduce, compiled with CFLAGS=-fsanitize=address,
then run
nm input
This is the bug trace reported by ASAN:
=================================================================
==120174==ERROR: AddressSanitizer: heap-use-after-free on address
0x621000016d5c at pc 0x000000538f3b bp 0x7fffe339c6c0 sp 0x7fffe339c6b0
WRITE of size 4 at 0x621000016d5c thread T0
#0 0x538f3a in bfd_section_from_shdr ../../bfd/elf.c:2604
#1 0x6e9c8c in bfd_elf32_object_p ../../bfd/elfcode.h:815
#2 0x450216 in bfd_check_format_matches ../../bfd/format.c:328
#3 0x412978 in display_file ../../binutils/nm.c:1375
#4 0x4081a7 in main ../../binutils/nm.c:1860
#5 0x7efdc018982f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#6 0x40a248 in _start
(/mnt/data/playground/binutils-2.34-a/build/binutils/nm-new+0x40a248)
0x621000016d5c is located 1116 bytes inside of 4064-byte region
[0x621000016900,0x6210000178e0)
freed by thread T0 here:
#0 0x7efdc07cf32a in __interceptor_free
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x9832a)
#1 0x93b4e1 in objalloc_free_block ../../libiberty/objalloc.c:248
previously allocated by thread T0 here:
#0 0x7efdc07cf662 in malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98662)
#1 0x93ab49 in _objalloc_alloc ../../libiberty/objalloc.c:159
SUMMARY: AddressSanitizer: heap-use-after-free ../../bfd/elf.c:2604
bfd_section_from_shdr
Shadow bytes around the buggy address:
0x0c427fffad50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffad60: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffad70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffad80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffad90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c427fffada0: fd fd fd fd fd fd fd fd fd fd fd[fd]fd fd fd fd
0x0c427fffadb0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffadc0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffadd0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffade0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c427fffadf0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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
Heap right redzone: fb
Freed heap region: fd
Stack left redzone: f1
Stack mid redzone: f2
Stack right redzone: f3
Stack partial redzone: f4
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
==120174==ABORTING
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