| 1 | // RUN: %clangxx_asan -O2 %s -o %t |
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| 2 | // RUN: %env_asan_opts=fast_unwind_on_malloc=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST |
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| 3 | // RUN: %env_asan_opts=fast_unwind_on_malloc=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SLOW |
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| 4 | |
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| 5 | // Test how well we unwind in presence of qsort in the stack |
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| 6 | // (i.e. if we can unwind through a function compiled w/o frame pointers). |
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| 7 | // https://code.google.com/p/address-sanitizer/issues/detail?id=137 |
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| 8 | |
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| 9 | // Fast unwinder is only available on x86_64 and i386. |
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| 10 | // REQUIRES: x86-target-arch |
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| 11 | |
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| 12 | // REQUIRES: compiler-rt-optimized |
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| 13 | |
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| 14 | #include <stdlib.h> |
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| 15 | #include <stdio.h> |
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| 16 | |
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| 17 | int *GlobalPtr; |
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| 18 | |
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| 19 | extern "C" { |
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| 20 | int QsortCallback(const void *a, const void *b) { |
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| 21 | char *x = (char*)a; |
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| 22 | char *y = (char*)b; |
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| 23 | printf(format: "Calling QsortCallback\n" ); |
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| 24 | GlobalPtr = new int[10]; |
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| 25 | return (int)*x - (int)*y; |
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| 26 | } |
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| 27 | |
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| 28 | __attribute__((noinline)) |
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| 29 | void MyQsort(char *a, size_t size) { |
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| 30 | printf(format: "Calling qsort\n" ); |
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| 31 | qsort(base: a, nmemb: size, size: sizeof(char), compar: QsortCallback); |
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| 32 | printf(format: "Done\n" ); // Avoid tail call. |
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| 33 | } |
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| 34 | } // extern "C" |
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| 35 | |
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| 36 | int main() { |
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| 37 | char a[2] = {1, 2}; |
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| 38 | MyQsort(a, size: 2); |
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| 39 | return GlobalPtr[10]; |
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| 40 | } |
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| 41 | |
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| 42 | // Fast unwind may not unwind through qsort. |
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| 43 | // CHECK-FAST: ERROR: AddressSanitizer: heap-buffer-overflow |
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| 44 | // CHECK-FAST: is located 0 bytes after |
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| 45 | // CHECK-FAST: #0{{.*}}operator new |
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| 46 | // CHECK-FAST-NEXT: #1{{.*}}QsortCallback |
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| 47 | |
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| 48 | // CHECK-SLOW: ERROR: AddressSanitizer: heap-buffer-overflow |
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| 49 | // CHECK-SLOW: is located 0 bytes after |
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| 50 | // CHECK-SLOW: #0{{.*}}operator new |
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| 51 | // CHECK-SLOW-NEXT: #1{{.*}}QsortCallback |
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| 52 | // CHECK-SLOW: #{{.*}}MyQsort |
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| 53 | // CHECK-SLOW-NEXT: #{{.*}}main |
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| 54 | |
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