1 files changed, 23 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/test_bug813901.js b/js/xpconnect/tests/unit/test_bug813901.js
new file mode 100644
index 0000000000..433c7872ef
--- /dev/null
+++ b/js/xpconnect/tests/unit/test_bug813901.js
@@ -0,0 +1,23 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* See https://bugzilla.mozilla.org/show_bug.cgi?id=813901 */
+
+// Make sure that we can't inject __exposedProps__ via the proto of a COW-ed object.
+
+function checkThrows(expression, sb, regexp) {
+  var result = Cu.evalInSandbox('(function() { try { ' + expression + '; return "allowed"; } catch (e) { return e.toString(); }})();', sb);
+  dump('result: ' + result + '\n\n\n');
+  Assert.ok(!!regexp.exec(result));
+}
+
+function run_test() {
+
+  var sb = new Cu.Sandbox('http://www.example.org');
+  sb.obj = {foo: 2};
+  checkThrows('obj.foo = 3;', sb, /denied/);
+  Cu.evalInSandbox("var p = {};", sb);
+  sb.obj.__proto__ = sb.p;
+  checkThrows('obj.foo = 4;', sb, /denied/);
+}