| // RUN: %clangxx_asan -O2 %s -o %t |
| // RUN: ASAN_OPTIONS=fast_unwind_on_fatal=1 %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST |
| // RUN: ASAN_OPTIONS=fast_unwind_on_fatal=0 %t 2>&1 | FileCheck %s --check-prefix=CHECK-SLOW |
| |
| // Test how well we unwind in presence of qsort in the stack |
| // (i.e. if we can unwind through a function compiled w/o frame pointers). |
| // https://code.google.com/p/address-sanitizer/issues/detail?id=137 |
| |
| // Fast unwinder is only avaliable on x86_64 and i386. |
| // REQUIRES: x86_64-supported-target |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| |
| int global_array[10]; |
| volatile int one = 1; |
| |
| extern "C" { |
| int QsortCallback(const void *a, const void *b) { |
| char *x = (char*)a; |
| char *y = (char*)b; |
| printf("Calling QsortCallback\n"); |
| global_array[one * 10] = 0; // BOOM |
| return (int)*x - (int)*y; |
| } |
| |
| __attribute__((noinline)) |
| void MyQsort(char *a, size_t size) { |
| printf("Calling qsort\n"); |
| qsort(a, size, sizeof(char), QsortCallback); |
| printf("Done\n"); // Avoid tail call. |
| } |
| } // extern "C" |
| |
| int main() { |
| char a[2] = {1, 2}; |
| MyQsort(a, 2); |
| } |
| |
| // Fast unwind: can not unwind through qsort. |
| |
| // CHECK-FAST: ERROR: AddressSanitizer: global-buffer-overflow |
| // CHECK-FAST: #0{{.*}} in QsortCallback |
| // CHECK-FAST-NOT: MyQsort |
| // CHECK-FAST: is located 0 bytes to the right of global variable 'global_array |
| |
| // CHECK-SLOW: ERROR: AddressSanitizer: global-buffer-overflow |
| // CHECK-SLOW: #0{{.*}} in QsortCallback |
| // CHECK-SLOW: #{{.*}} in MyQsort |
| // CHECK-SLOW: #{{.*}} in main |
| // CHECK-SLOW: is located 0 bytes to the right of global variable 'global_array |