[SharedArrayBuffer] Prevent SharedArrayBuffer being used in Web APIs

third_party/WebKit/Source/core/dom/DOMMatrix.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/DOMMatrix.h"
 
 namespace blink {
 
 DOMMatrix* DOMMatrix::create(ExceptionState& exceptionState) {
   return new DOMMatrix(TransformationMatrix());
@@ skipping 21 matching lines @@
                              ExceptionState& exceptionState) {
   if (sequence.size() != 6 && sequence.size() != 16) {
     exceptionState.throwTypeError(
         "The sequence must contain 6 elements for a 2D matrix or 16 elements "
         "for a 3D matrix.");
     return nullptr;
   }
   return new DOMMatrix(sequence, sequence.size());
 }
 
-DOMMatrix* DOMMatrix::fromFloat32Array(DOMFloat32Array* float32Array,
-                                       ExceptionState& exceptionState) {
+DOMMatrix* DOMMatrix::fromFloat32Array(
+    const MaybeShared<DOMFloat32Array>& maybeShared,
+    ExceptionState& exceptionState) {
+  if (maybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "The Float32Array must not be backed by a SharedArrayBuffer.");
+    return nullptr;
+  }
+  DOMFloat32Array* float32Array = maybeShared.viewNotShared();
   if (float32Array->length() != 6 && float32Array->length() != 16) {
     exceptionState.throwTypeError(
         "The sequence must contain 6 elements for a 2D matrix or 16 elements "
         "for a 3D matrix.");
     return nullptr;
   }
   return new DOMMatrix(float32Array->data(), float32Array->length());
 }
 
-DOMMatrix* DOMMatrix::fromFloat64Array(DOMFloat64Array* float64Array,
-                                       ExceptionState& exceptionState) {
+DOMMatrix* DOMMatrix::fromFloat64Array(
+    const MaybeShared<DOMFloat64Array>& maybeShared,
+    ExceptionState& exceptionState) {
+  if (maybeShared.isShared()) {
+    exceptionState.throwTypeError(
+        "The Float64Array must not be backed by a SharedArrayBuffer.");
+    return nullptr;
+  }
+  DOMFloat64Array* float64Array = maybeShared.viewNotShared();
   if (float64Array->length() != 6 && float64Array->length() != 16) {
     exceptionState.throwTypeError(
         "The sequence must contain 6 elements for a 2D matrix or 16 elements "
         "for a 3D matrix.");
     return nullptr;
   }
   return new DOMMatrix(float64Array->data(), float64Array->length());
 }
 
 template <typename T>
@@ skipping 193 matching lines @@
   return this;
 }
 
 DOMMatrix* DOMMatrix::setMatrixValue(const String& inputString,
                                      ExceptionState& exceptionState) {
   setMatrixValueFromString(inputString, exceptionState);
   return this;
 }
 
 }  // namespace blink