1 // RUN: %clangxx_asan -O2 %s -o %t
2 // RUN: %env_asan_opts=fast_unwind_on_fatal=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST
3 // RUN: %env_asan_opts=fast_unwind_on_fatal=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SLOW
4
5 // Test how well we unwind in presence of qsort in the stack
6 // (i.e. if we can unwind through a function compiled w/o frame pointers).
7 // https://code.google.com/p/address-sanitizer/issues/detail?id=137
8
9 // Fast unwinder is only available on x86_64 and i386.
10 // REQUIRES: x86-target-arch
11
12 #include <stdlib.h>
13 #include <stdio.h>
14
15 int global_array[10];
16 volatile int one = 1;
17
18 extern "C" {
QsortCallback(const void * a,const void * b)19 int QsortCallback(const void *a, const void *b) {
20 char *x = (char*)a;
21 char *y = (char*)b;
22 printf("Calling QsortCallback\n");
23 global_array[one * 10] = 0; // BOOM
24 return (int)*x - (int)*y;
25 }
26
27 __attribute__((noinline))
MyQsort(char * a,size_t size)28 void MyQsort(char *a, size_t size) {
29 printf("Calling qsort\n");
30 qsort(a, size, sizeof(char), QsortCallback);
31 printf("Done\n"); // Avoid tail call.
32 }
33 } // extern "C"
34
main()35 int main() {
36 char a[2] = {1, 2};
37 MyQsort(a, 2);
38 }
39
40 // Fast unwind may not unwind through qsort.
41 // CHECK-FAST: ERROR: AddressSanitizer: global-buffer-overflow
42 // CHECK-FAST: #0{{.*}} in QsortCallback
43 // CHECK-FAST: is located 0 bytes to the right of global variable 'global_array
44
45 // CHECK-SLOW: ERROR: AddressSanitizer: global-buffer-overflow
46 // CHECK-SLOW: #0{{.*}} in QsortCallback
47 // CHECK-SLOW: #{{.*}} in MyQsort
48 // CHECK-SLOW: #{{.*}} in main
49 // CHECK-SLOW: is located 0 bytes to the right of global variable 'global_array
50