1 // RUN: %clangxx_asan -O2 %s -o %t
2 // RUN: ASAN_OPTIONS=fast_unwind_on_fatal=1 %t 2>&1 | %symbolize | FileCheck %s --check-prefix=CHECK-FAST
3 // RUN: ASAN_OPTIONS=fast_unwind_on_fatal=0 %t 2>&1 | %symbolize | 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 #include <stdlib.h>
9 #include <stdio.h>
10
11 int global_array[10];
12 volatile int one = 1;
13
14 extern "C" {
QsortCallback(const void * a,const void * b)15 int QsortCallback(const void *a, const void *b) {
16 char *x = (char*)a;
17 char *y = (char*)b;
18 printf("Calling QsortCallback\n");
19 global_array[one * 10] = 0; // BOOM
20 return (int)*x - (int)*y;
21 }
22
23 __attribute__((noinline))
MyQsort(char * a,size_t size)24 void MyQsort(char *a, size_t size) {
25 printf("Calling qsort\n");
26 qsort(a, size, sizeof(char), QsortCallback);
27 printf("Done\n"); // Avoid tail call.
28 }
29 } // extern "C"
30
main()31 int main() {
32 char a[2] = {1, 2};
33 MyQsort(a, 2);
34 }
35
36 // Fast unwind: can not unwind through qsort.
37
38 // CHECK-FAST: ERROR: AddressSanitizer: global-buffer-overflow
39 // CHECK-FAST: #0{{.*}} in QsortCallback
40 // CHECK-FAST-NOT: MyQsort
41 // CHECK-FAST: is located 0 bytes to the right of global variable 'global_array
42
43 // CHECK-SLOW: ERROR: AddressSanitizer: global-buffer-overflow
44 // CHECK-SLOW: #0{{.*}} in QsortCallback
45 // CHECK-SLOW: #{{.*}} in MyQsort
46 // CHECK-SLOW: #{{.*}} in main
47 // CHECK-SLOW: is located 0 bytes to the right of global variable 'global_array
48