使用这个allow_user_poisoning=0,来取消
以这个例子为例:
// example1.cpp
// use-after-poison error
#include <stdlib.h>
extern "C" void __asan_poison_memory_region(void *, size_t);
int main(int argc, char **argv) {
char *x = new char[16];
x[10] = 0;
__asan_poison_memory_region(x, 16);
int res = x[argc * 10]; // Boom!
delete [] x;
return res;
}
gcc -fsanitize=address eaxmple1.cpp -o ufpexe
运行会报错:
=================================================================
==9369==ERROR: AddressSanitizer: use-after-poison on address 0x60200000001a at pc 0x5635fbfa99f2 bp 0x7fffc5a981d0 sp 0x7fffc5a981c0
READ of size 1 at 0x60200000001a thread T0
#0 0x5635fbfa99f1 in main (/home/xijun.gong/x86_64-linux-rel/tops/system_test/model_test/topsinference_test/a.out+0x9f1)
#1 0x7f5e429f5bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
#2 0x5635fbfa9859 in _start (/home/xijun.gong/x86_64-linux-rel/tops/system_test/model_test/topsinference_test/a.out+0x859)
0x60200000001a is located 10 bytes inside of 16-byte region [0x602000000010,0x602000000020)
allocated by thread T0 here:
#0 0x7f5e42ea5608 in operator new[](unsigned long) (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xe0608)
#1 0x5635fbfa9952 in main (/home/xijun.gong/x86_64-linux-rel/tops/system_test/model_test/topsinference_test/a.out+0x952)
#2 0x7f5e429f5bf6 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21bf6)
SUMMARY: AddressSanitizer: use-after-poison (/home/xijun.gong/x86_64-linux-rel/tops/system_test/model_test/topsinference_test/a.out+0x9f1) in main
Shadow bytes around the buggy address:
0x0c047fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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 f7[f7]fa fa fa fa fa fa fa fa fa fa fa fa
0x0c047fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa 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
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
==9369==ABORTING
这样运行会取消掉:
ASAN_OPTIONS=allow_user_poisoning=0 ./exeamp