Add a fragment change exception to history API's unique origin restrictions.

third_party/WebKit/Source/core/frame/History.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 164 matching lines @@
     Document* document = m_frame->document();
 
     if (urlString.isNull())
         return document->url();
     if (urlString.isEmpty())
         return document->baseURL();
 
     return KURL(document->baseURL(), urlString);
 }
 
-bool History::canChangeToUrl(const KURL& url)
+bool History::canChangeToUrl(const KURL& url, SecurityOrigin* documentOrigin, const KURL& documentURL)
 {
     if (!url.isValid())
         return false;
 
-    Document* document = m_frame->document();
-    SecurityOrigin* origin = document->securityOrigin();
-    if (origin->isGrantedUniversalAccess())
+    if (documentOrigin->isGrantedUniversalAccess())
         return true;
 
-    if (origin->isUnique())
-        return false;
+    // We allow sandboxed documents, `data:`/`file:` URLs, etc. to use
+    // 'pushState'/'replaceState' to modify the URL fragment: see
+    // https://crbug.com/528681 for the compatibility concerns.
+    if (documentOrigin->isUnique() || documentOrigin->isLocal())
+        return equalIgnoringFragmentIdentifier(url, documentURL);
 
-    if (!equalIgnoringPathQueryAndFragment(url, document->url()))
+    if (!equalIgnoringPathQueryAndFragment(url, documentURL))
         return false;
 
     RefPtr<SecurityOrigin> requestedOrigin = SecurityOrigin::create(url);
-    if (requestedOrigin->isUnique() || !requestedOrigin->isSameSchemeHostPort(origin))
+    if (requestedOrigin->isUnique() || !requestedOrigin->isSameSchemeHostPort(documentOrigin))
         return false;
 
     return true;
 }
 
 void History::stateObjectAdded(PassRefPtr<SerializedScriptValue> data, const String& /* title */, const String& urlString, HistoryScrollRestorationType restorationType, FrameLoadType type, ExceptionState& exceptionState)
 {
     if (!m_frame || !m_frame->page() || !m_frame->loader().documentLoader())
         return;
 
     KURL fullURL = urlForState(urlString);
-    if (!canChangeToUrl(fullURL)) {
+    if (!canChangeToUrl(fullURL, m_frame->document()->securityOrigin(), m_frame->document()->url())) {
         // We can safely expose the URL to JavaScript, as a) no redirection takes place: JavaScript already had this URL, b) JavaScript can only access a same-origin History object.
         exceptionState.throwSecurityError("A history state object with URL '" + fullURL.elidedString() + "' cannot be created in a document with origin '" + m_frame->document()->securityOrigin()->toString() + "' and URL '" + m_frame->document()->url().elidedString() + "'.");
         return;
     }
 
     m_frame->loader().updateForSameDocumentNavigation(fullURL, SameDocumentNavigationHistoryApi, data, restorationType, type);
 }
 
 } // namespace blink