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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 19:33:14 +0000
commit36d22d82aa202bb199967e9512281e9a53db42c9 (patch)
tree105e8c98ddea1c1e4784a60a5a6410fa416be2de /js/xpconnect/tests/chrome/test_bug732665.xhtml
parentInitial commit. (diff)
downloadfirefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz
firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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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=732665
+-->
+<window title="Mozilla Bug 732665"
+ 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=732665"
+ target="_blank">Mozilla Bug 732665</a>
+ </body>
+
+ <!-- test code goes here -->
+ <script type="application/javascript">
+ <![CDATA[
+
+add_task(async () => {
+ await SpecialPowers.pushPrefEnv({"set": [["security.allow_eval_with_system_principal",
+ true]]});
+ //
+ // Important! If this test starts failing after a tricky platform-y change,
+ // the stack quota numbers in XPCJSContext probably need twiddling. We want
+ // to maintain the invariants in this test (at least to some approximation)
+ // for security reasons.
+ //
+
+ // Executes f() d steps from the probed native stack limit, and returns
+ // the number of steps to the recursion limit from the caller.
+ function nearNativeStackLimit(d, f) {
+ f = f || function() {};
+ let failed = null;
+ function inner() {
+ try {
+ // eslint-disable-next-line no-eval
+ var stepsFromLimit = eval("inner()"); // Use eval to force a number of native stackframes to be created.
+ if (stepsFromLimit == d) {
+ try {
+ f();
+ } catch(e) {
+ // If we didn't have enough stack space to call the (possibly
+ // trivial) test function above, we obviously can't expect to call
+ // into the test harness assertion code successfully.
+ failed = e;
+ }
+ }
+ return stepsFromLimit + 1;
+ } catch(e) {
+ // It would be nice to check here that the exception is actually an
+ // over-recursion here. But doing so would require toString()ing the
+ // exception, which we may not have the stack space to do.
+ return 0;
+ }
+ }
+ let result = inner();
+ ok(!failed, `nearNativeStackLimit callback threw: ${failed}`);
+ return result;
+ }
+
+ var contentSb = new Cu.Sandbox("https://www.example.com");
+ var chromeSb = new Cu.Sandbox(window);
+ chromeSb.ok = contentSb.ok = ok;
+ Cu.evalInSandbox(nearNativeStackLimit.toSource(), chromeSb);
+ Cu.evalInSandbox(nearNativeStackLimit.toSource(), contentSb);
+ var chromeLimit = Cu.evalInSandbox("nearNativeStackLimit(0);", chromeSb);
+ var contentLimit = Cu.evalInSandbox("nearNativeStackLimit(0)", contentSb);
+ ok(chromeLimit >= contentLimit + 10,
+ "Chrome should be able to have at least 10 heavy frames more stack than content: " + chromeLimit + ", " + contentLimit);
+
+ // Exhaust the stack space in content, and then make sure we can still get 10
+ // heavy frames in chrome.
+ //
+ // Note that sometimes, if we pass |0| to nearNativeStackLimit, we can end up
+ // so close to the border in content that we can't even get ourselves together
+ // enough to make the cross-compartment call. So rather than exhausting the
+ // stack entirely and then checking for 10 chrome frames, we leave ourselves
+ // one frame's worth, and check for 11.
+ //
+ // If this assertion fails, the current work-around so far is to measure
+ // again the worst frame size, by using the JS Shell to run
+ // test_bug732665_meta.js . This script will output numbers to update
+ // XPCJSContext.cpp comment, as well as the kTrustedScriptBuffer constant.
+ contentSb.nnslChrome = chromeSb.nearNativeStackLimit;
+ var nestedLimit = Cu.evalInSandbox("nearNativeStackLimit(1, function() { nestedLimit = nnslChrome(0);}); nestedLimit;", contentSb);
+ ok(nestedLimit >= 11, "Chrome should be invokable from content script with an exhausted stack: " + nestedLimit);
+});
+ ]]>
+ </script>
+</window>