54 lines · cpp
1// RUN: %clangxx_asan -O2 %s -o %t2// RUN: %env_asan_opts=fast_unwind_on_malloc=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST3// RUN: %env_asan_opts=fast_unwind_on_malloc=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SLOW4 5// Test how well we unwind in presence of qsort in the stack6// (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=1378 9// Fast unwinder is only available on x86_64 and i386.10// REQUIRES: x86-target-arch11 12// REQUIRES: compiler-rt-optimized13 14#include <stdlib.h>15#include <stdio.h>16 17int *GlobalPtr;18 19extern "C" {20int 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))29void 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 36int 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-overflow44// CHECK-FAST: is located 0 bytes after45// CHECK-FAST: #0{{.*}}operator new46// CHECK-FAST-NEXT: #1{{.*}}QsortCallback47 48// CHECK-SLOW: ERROR: AddressSanitizer: heap-buffer-overflow49// CHECK-SLOW: is located 0 bytes after50// CHECK-SLOW: #0{{.*}}operator new51// CHECK-SLOW-NEXT: #1{{.*}}QsortCallback52// CHECK-SLOW: #{{.*}}MyQsort53// CHECK-SLOW-NEXT: #{{.*}}main54