Added access check to Runtime_GetPrototype.

src/runtime.cc

 // Copyright 2011 the V8 project authors. 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
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 665 matching lines @@
   ASSERT(args.length() == 1);
   Object* obj = args[0];
   if (!obj->IsJSObject()) return isolate->heap()->null_value();
   return JSObject::cast(obj)->class_name();
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_GetPrototype) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 1);
-  Object* obj = args[0];
+  CONVERT_CHECKED(JSReceiver, input_obj, args[0]);
+  Object* obj = input_obj;
+  // We don't expect access checks to be needed on JSProxy objects.
+  ASSERT(!obj->IsAccessCheckNeeded() || obj->IsJSObject());
   do {
+    if (obj->IsAccessCheckNeeded() &&
+        !isolate->MayNamedAccess(JSObject::cast(obj),
+                                 isolate->heap()->Proto_symbol(),
+                                 v8::ACCESS_GET)) {
+      isolate->ReportFailedAccessCheck(JSObject::cast(obj), v8::ACCESS_GET);
+      return isolate->heap()->undefined_value();
+    }
     obj = obj->GetPrototype();
   } while (obj->IsJSObject() &&
            JSObject::cast(obj)->map()->is_hidden_prototype());
   return obj;
 }
 
 
 RUNTIME_FUNCTION(MaybeObject*, Runtime_IsInPrototypeChain) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
@@ skipping 12232 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal