1 files changed, 16 insertions, 0 deletions
diff --git a/test/msan/unpoison_string.cc b/test/msan/unpoison_string.cc
new file mode 100644
index 000000000000..ac947b9cf6fd
--- /dev/null
+++ b/test/msan/unpoison_string.cc
@@ -0,0 +1,16 @@
+// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O0 %s -o %t
+// RUN: %run %t
+// RUN: %clangxx_msan -fsanitize-memory-track-origins -m64 -O3 %s -o %t
+// RUN: %run %t
+
+#include <assert.h>
+#include <string.h>
+#include <sanitizer/msan_interface.h>
+
+int main(int argc, char **argv) {
+  char s[20] = "string";
+  __msan_poison(s, sizeof(s));
+  __msan_unpoison_string(s);
+  assert(__msan_test_shadow(s, sizeof(s)) == strlen("string") + 1);
+  return 0;
+}