1 files changed, 49 insertions, 0 deletions
diff --git a/compiler-rt/test/asan/TestCases/Linux/overflow-in-qsort.cpp b/compiler-rt/test/asan/TestCases/Linux/overflow-in-qsort.cpp
new file mode 100644
index 00000000000..6990518e43a
--- /dev/null
+++ b/compiler-rt/test/asan/TestCases/Linux/overflow-in-qsort.cpp
@@ -0,0 +1,49 @@
+// RUN: %clangxx_asan -O2 %s -o %t
+// RUN: %env_asan_opts=fast_unwind_on_fatal=1 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FAST
+// RUN: %env_asan_opts=fast_unwind_on_fatal=0 not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SLOW
+
+// Test how well we unwind in presence of qsort in the stack
+// (i.e. if we can unwind through a function compiled w/o frame pointers).
+// https://code.google.com/p/address-sanitizer/issues/detail?id=137
+
+// Fast unwinder is only available on x86_64 and i386.
+// REQUIRES: x86-target-arch
+
+#include <stdlib.h>
+#include <stdio.h>
+
+int global_array[10];
+volatile int one = 1;
+
+extern "C" {
+int QsortCallback(const void *a, const void *b) {
+  char *x = (char*)a;
+  char *y = (char*)b;
+  printf("Calling QsortCallback\n");
+  global_array[one * 10] = 0;  // BOOM
+  return (int)*x - (int)*y;
+}
+
+__attribute__((noinline))
+void MyQsort(char *a, size_t size) {
+  printf("Calling qsort\n");
+  qsort(a, size, sizeof(char), QsortCallback);
+  printf("Done\n");  // Avoid tail call.
+}
+}  // extern "C"
+
+int main() {
+  char a[2] = {1, 2};
+  MyQsort(a, 2);
+}
+
+// Fast unwind may not unwind through qsort.
+// CHECK-FAST: ERROR: AddressSanitizer: global-buffer-overflow
+// CHECK-FAST: #0{{.*}} in QsortCallback
+// CHECK-FAST: is located 0 bytes to the right of global variable 'global_array
+
+// CHECK-SLOW: ERROR: AddressSanitizer: global-buffer-overflow
+// CHECK-SLOW: #0{{.*}} in QsortCallback
+// CHECK-SLOW: #{{.*}} in MyQsort
+// CHECK-SLOW: #{{.*}} in main
+// CHECK-SLOW: is located 0 bytes to the right of global variable 'global_array