1 // RUN: %clangxx_asan -O2 %s -o %t 2 // RUN: %env_asan_opts=fast_unwind_on_fatal=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST 3 // RUN: %env_asan_opts=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-target-arch 11 12 #include <stdlib.h> 13 #include <stdio.h> 14 15 int global_array[10]; 16 volatile int one = 1; 17 18 extern "C" { 19 int 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)) 28 void 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 35 int 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-overflow 42 // CHECK-FAST: #0{{.*}} in QsortCallback 43 // CHECK-FAST: is located 0 bytes to the right of global variable 'global_array 44 45 // CHECK-SLOW: ERROR: AddressSanitizer: global-buffer-overflow 46 // CHECK-SLOW: #0{{.*}} in QsortCallback 47 // CHECK-SLOW: #{{.*}} in MyQsort 48 // CHECK-SLOW: #{{.*}} in main 49 // CHECK-SLOW: is located 0 bytes to the right of global variable 'global_array 50
