1 files changed, 28 insertions, 0 deletions
diff --git a/test/asan/TestCases/small_memcpy_test.cc b/test/asan/TestCases/small_memcpy_test.cc
new file mode 100644
index 0000000000000..2d6dea60caedd
--- /dev/null
+++ b/test/asan/TestCases/small_memcpy_test.cc
@@ -0,0 +1,28 @@
+// Test that small memcpy works correctly.
+
+// RUN: %clangxx_asan %s -o %t
+// RUN: not %run %t 8 24 2>&1 | FileCheck %s --check-prefix=CHECK
+// RUN: not %run %t 16 32 2>&1 | FileCheck %s --check-prefix=CHECK
+// RUN: not %run %t 24 40 2>&1 | FileCheck %s --check-prefix=CHECK
+// RUN: not %run %t 32 48 2>&1 | FileCheck %s --check-prefix=CHECK
+// RUN: not %run %t 40 56 2>&1 | FileCheck %s --check-prefix=CHECK
+// RUN: not %run %t 48 64 2>&1 | FileCheck %s --check-prefix=CHECK
+#include <assert.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <sanitizer/asan_interface.h>
+
+int main(int argc, char **argv) {
+  assert(argc == 3);
+  size_t poison_from = atoi(argv[1]);
+  size_t poison_to = atoi(argv[2]);
+  assert(poison_from <= poison_to);
+  char A1[64], A2[64];
+  fprintf(stderr, "%zd %zd\n", poison_from, poison_to - poison_from);
+  __asan_poison_memory_region(&A1[0] + poison_from, poison_to - poison_from);
+  memcpy(A1, A2, sizeof(A1));
+// CHECK: AddressSanitizer: use-after-poison
+  return 0;
+}