Don't allow seal or element property re-definition on external arrays.

R=ricow@chromium.org
BUG=95920
TEST=test/mjsunit/regress/regress-95920.js

Review URL: http://codereview.chromium.org/7858031

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9213 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/messages.js

@@ -239,6 +239,8 @@ function FormatMessage(message) {
       "strict_poison_pill",           ["'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them"],
       "strict_caller",                ["Illegal access to a strict mode caller function."],
       "unprotected_let",              ["Illegal let declaration in unprotected statement context."],
+      "cant_prevent_ext_external_array_elements", ["Cannot prevent extension of an object with external array elements"],
+      "redef_external_array_element", ["Cannot redefine a property of an object with external array elements"],
     ];
     var messages = { __proto__ : null };
     var desc = new PropertyDescriptor();

src/objects.cc

@@ -3414,6 +3414,17 @@ MaybeObject* JSObject::PreventExtensions() {
     return JSObject::cast(proto)->PreventExtensions();
   }
 
+  // It's not possible to seal objects with external array elements
+  if (HasExternalArrayElements()) {
+    HandleScope scope(isolate);
+    Handle<Object> object(this);
+    Handle<Object> error  =
+        isolate->factory()->NewTypeError(
+            "cant_prevent_ext_external_array_elements",
+            HandleVector(&object, 1));
+    return isolate->Throw(*error);
+  }
+
   // If there are fast elements we normalize.
   NumberDictionary* dictionary = NULL;
   { MaybeObject* maybe = NormalizeElements();

src/runtime.cc

@@ -4293,6 +4293,17 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_DefineOrRedefineDataProperty) {
       if (proto->IsNull()) return *obj_value;
       js_object = Handle<JSObject>::cast(proto);
     }
+
+    // Don't allow element properties to be redefined on objects with external
+    // array elements.
+    if (js_object->HasExternalArrayElements()) {
+      Handle<Object> args[2] = { js_object, name };
+      Handle<Object> error =
+          isolate->factory()->NewTypeError("redef_external_array_element",
+                                           HandleVector(args, 2));
+      return isolate->Throw(*error);
+    }
+
     Handle<NumberDictionary> dictionary = NormalizeElements(js_object);
     // Make sure that we never go back to fast case.
     dictionary->set_requires_slow_elements();

test/mjsunit/regress/regress-95920.js

+// 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Tests that objects with external arrays cannot be sealed or have their
+// properties redefined.
+
+(function() {
+  assertThrows(function() {
+    [0].every(function(){ Object.seal((new Int8Array(42))); });
+    assertUnreable();
+    }, TypeError)
+})();
+
+(function() {
+  assertThrows(function() {
+    [0].every(function(){ Object.freeze((new Int8Array(42))); });
+    assertUnreable();
+    }, TypeError)
+})();
+
+(function() {
+  assertThrows(function() {
+    [0].every(function(){ Object.preventExtensions((new Int8Array(42))); });
+    assertUnreable();
+    }, TypeError)
+})();
+
+(function() {
+  assertThrows(function() {
+      Object.defineProperty(new Int8Array(42), "1",
+                            { writable: false, value: "1" });
+      assertUnreable();
+    })
+})();