50 lines · cpp
1// RUN: %clangxx_asan -O2 %s -o %t2// RUN: %env_asan_opts=fast_unwind_on_fatal=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST3// RUN: %env_asan_opts=fast_unwind_on_fatal=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#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; // BOOM24 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 may not unwind through qsort.41// CHECK-FAST: ERROR: AddressSanitizer: global-buffer-overflow42// CHECK-FAST: #0{{.*}} in QsortCallback43// CHECK-FAST: is located 0 bytes after global variable 'global_array44 45// CHECK-SLOW: ERROR: AddressSanitizer: global-buffer-overflow46// CHECK-SLOW: #0{{.*}} in QsortCallback47// CHECK-SLOW: #{{.*}} in MyQsort48// CHECK-SLOW: #{{.*}} in main49// CHECK-SLOW: is located 0 bytes after global variable 'global_array50