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

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:
+//
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+// 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,
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+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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+// (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();
+    })
+})();