Merge 95488 - Named property confusion with __proto__

Source/WebCore/bindings/v8/custom/V8DOMWindowCustom.cpp

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 531 matching lines @@
 
     DOMWindow* targetWindow = V8DOMWindow::toNative(window);
 
     ASSERT(targetWindow);
 
     Frame* target = targetWindow->frame();
     if (!target)
         return false;
 
     if (key->IsString()) {
+        DEFINE_STATIC_LOCAL(AtomicString, nameOfProtoProperty, ("__proto__"));
+
         String name = toWebCoreString(key);
         // Notice that we can't call HasRealNamedProperty for ACCESS_HAS
         // because that would generate infinite recursion.
         if (type == v8::ACCESS_HAS && target->tree()->child(name))
             return true;
-        if (type == v8::ACCESS_GET && target->tree()->child(name) && !host->HasRealNamedProperty(key->ToString()))
+        // We need to explicitly compare against nameOfProtoProperty because
+        // V8's JSObject::LocalLookup finds __proto__ before
+        // interceptors and even when __proto__ isn't a "real named property".
+        if (type == v8::ACCESS_GET && target->tree()->child(name) && !host->HasRealNamedProperty(key->ToString()) && name != nameOfProtoProperty)
             return true;
     }
 
     return V8BindingSecurity::canAccessFrame(V8BindingState::Only(), target, false);
 }
 
 bool V8DOMWindow::indexedSecurityCheck(v8::Local<v8::Object> host, uint32_t index, v8::AccessType type, v8::Local<v8::Value>)
 {
     v8::Handle<v8::Object> window = V8DOMWrapper::lookupDOMWrapper(V8DOMWindow::GetTemplate(), host);
     if (window.IsEmpty())
@@ skipping 44 matching lines @@
     v8::Handle<v8::Context> context = V8Proxy::context(frame);
     if (context.IsEmpty())
         return v8::Handle<v8::Object>();
 
     v8::Handle<v8::Object> global = context->Global();
     ASSERT(!global.IsEmpty());
     return global;
 }
 
 } // namespace WebCore