Home | History | Annotate | Download | only in Linux
      1 // RUN: %clangxx_asan -O2 %s -o %t
      2 // RUN: %env_asan_opts=fast_unwind_on_malloc=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST
      3 // RUN: %env_asan_opts=fast_unwind_on_malloc=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 // REQUIRES: compiler-rt-optimized
     13 
     14 #include <stdlib.h>
     15 #include <stdio.h>
     16 
     17 int *GlobalPtr;
     18 
     19 extern "C" {
     20 int 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))
     29 void 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 
     36 int 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-overflow
     44 // CHECK-FAST: is located 0 bytes to the right
     45 // CHECK-FAST: #0{{.*}}operator new
     46 // CHECK-FAST-NEXT: #1{{.*}}QsortCallback
     47 
     48 // CHECK-SLOW: ERROR: AddressSanitizer: heap-buffer-overflow
     49 // CHECK-SLOW: is located 0 bytes to the right
     50 // CHECK-SLOW: #0{{.*}}operator new
     51 // CHECK-SLOW-NEXT: #1{{.*}}QsortCallback
     52 // CHECK-SLOW: #{{.*}}MyQsort
     53 // CHECK-SLOW-NEXT: #{{.*}}main
     54