AddressSanitizer

centos安装相关库

yum install devtoolset-11-libasan-devel

使用

• 测试代码

[root@lzw test]# cat test_address_sanitizer.c 
#include <stdlib.h>
#include <stdio.h>
int test() {
    char *x = (char*)malloc(10 * sizeof(char*));
    free(x);
    return x[5];
}

int main() {
    char a = test();
    printf("hello a:%s",a);
}

• 编译

[root@lzw test]# gcc -g -fsanitize=address test_address_sanitizer.c  -o t

• 运行效果

[root@lzw test]# ./t
=================================================================
==25973==ERROR: AddressSanitizer: heap-use-after-free on address 0x607000000025 at pc 0x000000401204 bp 0x7ffd14d09d20 sp 0x7ffd14d09d10
READ of size 1 at 0x607000000025 thread T0
    #0 0x401203 in test /data/lzw/game/test/test_address_sanitizer.c:6
    #1 0x40121d in main /data/lzw/game/test/test_address_sanitizer.c:10
    #2 0x7f4e7a73f554 in __libc_start_main (/lib64/libc.so.6+0x22554)
    #3 0x4010f8  (/data/lzw/game/test/t+0x4010f8)

0x607000000025 is located 5 bytes inside of 80-byte region [0x607000000020,0x607000000070)
freed by thread T0 here:
    #0 0x7f4e7ab9f3e7 in free (/lib64/libasan.so.6+0xb43e7)
    #1 0x4011c7 in test /data/lzw/game/test/test_address_sanitizer.c:5
    #2 0x40121d in main /data/lzw/game/test/test_address_sanitizer.c:10
    #3 0x7f4e7a73f554 in __libc_start_main (/lib64/libc.so.6+0x22554)

previously allocated by thread T0 here:
    #0 0x7f4e7ab9f737 in malloc (/lib64/libasan.so.6+0xb4737)
    #1 0x4011b7 in test /data/lzw/game/test/test_address_sanitizer.c:4
    #2 0x40121d in main /data/lzw/game/test/test_address_sanitizer.c:10
    #3 0x7f4e7a73f554 in __libc_start_main (/lib64/libc.so.6+0x22554)

SUMMARY: AddressSanitizer: heap-use-after-free /data/lzw/game/test/test_address_sanitizer.c:6 in test
Shadow bytes around the buggy address:
  0x0c0e7fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c0e7fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c0e7fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c0e7fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c0e7fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c0e7fff8000: fa fa fa fa[fd]fd fd fd fd fd fd fd fd fd fa fa
  0x0c0e7fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff8050: 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
==25973==ABORTING

参考文档

https://www.bynav.com/cn/resource/bywork/healthy-work/70.html
https://github.com/google/sanitizers/wiki/AddressSanitizer