[asan] add asan/lit_tests/overflow-in-qsort.cc (not fully working yet)

llvm-svn: 170111

diff --git a/compiler-rt/lib/asan/lit_tests/overflow-in-qsort.cc b/compiler-rt/lib/asan/lit_tests/overflow-in-qsort.cc
new file mode 100644 (file)
index 0000000..ba49395
--- /dev/null
+++ b/compiler-rt/lib/asan/lit_tests/overflow-in-qsort.cc
@@ -0,0 +1,35 @@
+// RUN: %clangxx_asan -O2 %s -o %t && %t 2>&1 | %symbolize | FileCheck %s
+
+// 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
+#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.
+}
+
+int main() {
+  char a[2] = {1, 2};
+  MyQsort(a, 2);
+}
+
+// CHECK: ERROR: AddressSanitizer: global-buffer-overflow
+// CHECK: #0{{.*}} in QsortCallback
+// CHECK: is located 0 bytes to the right of global variable 'global_array