1 // RUN: %clangxx_asan -O2 %s -o %t
2 // RUN: %env_asan_opts=fast_unwind_on_malloc=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST
3 // RUN: %env_asan_opts=fast_unwind_on_malloc=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 // REQUIRES: compiler-rt-optimized
13
14 #include <stdlib.h>
15 #include <stdio.h>
16
17 int *GlobalPtr;
18
19 extern "C" {
QsortCallback(const void * a,const void * b)20 int QsortCallback(const void *a, const void *b) {
21 char *x = (char*)a;
22 char *y = (char*)b;
23 printf("Calling QsortCallback\n");
24 GlobalPtr = new int[10];
25 return (int)*x - (int)*y;
26 }
27
28 __attribute__((noinline))
MyQsort(char * a,size_t size)29 void MyQsort(char *a, size_t size) {
30 printf("Calling qsort\n");
31 qsort(a, size, sizeof(char), QsortCallback);
32 printf("Done\n"); // Avoid tail call.
33 }
34 } // extern "C"
35
main()36 int main() {
37 char a[2] = {1, 2};
38 MyQsort(a, 2);
39 return GlobalPtr[10];
40 }
41
42 // Fast unwind may not unwind through qsort.
43 // CHECK-FAST: ERROR: AddressSanitizer: heap-buffer-overflow
44 // CHECK-FAST: is located 0 bytes to the right
45 // CHECK-FAST: #0{{.*}}operator new
46 // CHECK-FAST-NEXT: #1{{.*}}QsortCallback
47
48 // CHECK-SLOW: ERROR: AddressSanitizer: heap-buffer-overflow
49 // CHECK-SLOW: is located 0 bytes to the right
50 // CHECK-SLOW: #0{{.*}}operator new
51 // CHECK-SLOW-NEXT: #1{{.*}}QsortCallback
52 // CHECK-SLOW: #{{.*}}MyQsort
53 // CHECK-SLOW-NEXT: #{{.*}}main
54