1 files changed, 28 insertions, 0 deletions
diff --git a/test/hwasan/TestCases/tail-magic.c b/test/hwasan/TestCases/tail-magic.c
new file mode 100644
index 0000000000000..95c5ada08a36f
--- /dev/null
+++ b/test/hwasan/TestCases/tail-magic.c
@@ -0,0 +1,28 @@
+// Tests free_checks_tail_magic=1.
+// RUN: %clang_hwasan  %s -o %t
+// RUN: %env_hwasan_opts=free_checks_tail_magic=0     %run %t
+// RUN: %env_hwasan_opts=free_checks_tail_magic=1 not %run %t 2>&1 | FileCheck %s
+// RUN:                                           not %run %t 2>&1 | FileCheck %s
+
+// REQUIRES: stable-runtime
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <sanitizer/hwasan_interface.h>
+
+static volatile void *sink;
+
+int main(int argc, char **argv) {
+  __hwasan_enable_allocator_tagging();
+
+  char *p = (char*)malloc(20);
+  sink = p;
+  p[20] = 0x42;
+  p[24] = 0x66;
+  free(p);
+// CHECK: ERROR: HWAddressSanitizer: alocation-tail-overwritten; heap object [{{.*}}) of size 20
+// CHECK: in main {{.*}}tail-magic.c:[[@LINE-2]]
+// CHECK: allocated here:
+// CHECK: in main {{.*}}tail-magic.c:[[@LINE-8]]
+// CHECK: Tail contains: .. .. .. .. 42 {{.. .. ..}} 66
+}