1// RUN: %clangxx_asan -O2 %s -o %t
2// RUN: ASAN_OPTIONS=fast_unwind_on_fatal=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST
3// RUN: ASAN_OPTIONS=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_64-supported-target
11
12#include <stdlib.h>
13#include <stdio.h>
14
15int global_array[10];
16volatile int one = 1;
17
18extern "C" {
19int 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))
28void 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
35int main() {
36  char a[2] = {1, 2};
37  MyQsort(a, 2);
38}
39
40// Fast unwind: can not unwind through qsort.
41
42// CHECK-FAST: ERROR: AddressSanitizer: global-buffer-overflow
43// CHECK-FAST: #0{{.*}} in QsortCallback
44// CHECK-FAST-NOT: MyQsort
45// CHECK-FAST: is located 0 bytes to the right of global variable 'global_array
46
47// CHECK-SLOW: ERROR: AddressSanitizer: global-buffer-overflow
48// CHECK-SLOW: #0{{.*}} in QsortCallback
49// CHECK-SLOW: #{{.*}} in MyQsort
50// CHECK-SLOW: #{{.*}} in main
51// CHECK-SLOW: is located 0 bytes to the right of global variable 'global_array
52