test_exposeInDerived.xhtml

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<?xml version="1.0"?>

<?xml-stylesheet type="text/css" href="chrome://global/skin"?>

<?xml-stylesheet type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"?>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=804630

-->

<window title="Mozilla Bug 804630"

        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"/>

  <!-- test results are displayed in the html:body -->

  <body xmlns="http://www.w3.org/1999/xhtml">

  <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=804630"

     target="_blank">Mozilla Bug 804630</a>

  </body>

  <!-- test code goes here -->

  <script type="application/javascript">

  <![CDATA[

  /** Test to make sure that COWed objects can't expose properties from their prototypes. **/

  // Set up the sandbox.

  var sb = new Cu.Sandbox("https://www.example.com");

  sb.ok = ok;

  sb.is = is;

  // Make a chrome object that tries to expose objects off its prototype.

  sb.proto = { read: 42, readWrite: 32 };

  sb.obj = {};

  sb.obj.__proto__ = sb.proto;

  // Make sure we can't access any of the properties on the prototype directly.

  Cu.evalInSandbox('is(proto.read, undefined, "proto.read inaccessible");', sb);

  Cu.evalInSandbox('var wrote = false; ' +

                   'try { proto.readWrite = 12; wrote = true; } catch(e) {} ' +

                   ' ok(!wrote, "Should not write proto property");', sb);

  // Make sure we can't access the exposed properties via the derived object.

  Cu.evalInSandbox('is(obj.read, undefined, "obj.read inaccessible");', sb);

  Cu.evalInSandbox('is(obj.readWrite, undefined, "obj.readWrite is not readable");', sb);

  Cu.evalInSandbox('try { obj.readWrite = 8; ok(false, "obj.readWrite is not writable"); } catch (e) {};',

                   sb);

]]>

  </script>

</window>