adds the security cookie check hook transform.

syzygy/instrument/transforms/security_cookie_check_hook_transform.h

Index: syzygy/instrument/transforms/security_cookie_check_hook_transform.h
diff --git a/syzygy/instrument/transforms/security_cookie_check_hook_transform.h b/syzygy/instrument/transforms/security_cookie_check_hook_transform.h
new file mode 100644
index 0000000000000000000000000000000000000000..96068bfa0c8e1df49cda5182ac2d445f8ff2ed65
--- /dev/null
+++ b/syzygy/instrument/transforms/security_cookie_check_hook_transform.h
@@ -0,0 +1,61 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// This transform redirects the '__report_gsfailure' function to
+// the following assembly stub: 'mov [deadbeef], 0'.
+// The function __report_gsfailure raises an exception that an EH
+// cannot intercept (for security reasons); this transform allows
+// an EH to catch the GS failures.
+
+#ifndef SYZYGY_INSTRUMENT_TRANSFORMS_SECURITY_COOKIE_CHECK_HOOK_TRANSFORM_H_
+#define SYZYGY_INSTRUMENT_TRANSFORMS_SECURITY_COOKIE_CHECK_HOOK_TRANSFORM_H_
+
+#include "base/logging.h"
+#include "syzygy/block_graph/basic_block_assembler.h"
+#include "syzygy/block_graph/basic_block_subgraph.h"
+#include "syzygy/block_graph/block_builder.h"
+#include "syzygy/block_graph/transform_policy.h"
+#include "syzygy/block_graph/transforms/named_transform.h"
+
+namespace instrument {
+namespace transforms {
+
+typedef block_graph::BasicBlockAssembler BasicBlockAssembler;
+typedef block_graph::BasicBlockSubGraph BasicBlockSubGraph;
+typedef block_graph::BasicCodeBlock BasicCodeBlock;
+typedef block_graph::BlockGraph BlockGraph;
+typedef block_graph::BlockBuilder BlockBuilder;
+typedef block_graph::TransformPolicyInterface TransformPolicyInterface;
+
+class SecurityCookieCheckHookTransform
+    : public block_graph::transforms::NamedBlockGraphTransformImpl<
+          SecurityCookieCheckHookTransform> {
+ public:
+  SecurityCookieCheckHookTransform() {}
+
+  static const char kTransformName[];
+  static const char kReportGsFailure[];
+  static const char kSyzygyReportGsFailure[];
+  static const uint32_t kInvalidUserAddress;
+
+  // BlockGraphTransformInterface implementation.
+  bool TransformBlockGraph(const TransformPolicyInterface* policy,
+                           BlockGraph* block_graph,
+                           BlockGraph::Block* header_block) final;
+};
+
+}  // namespace transforms
+}  // namespace instrument
+
+#endif  // SYZYGY_INSTRUMENT_TRANSFORMS_SECURITY_COOKIE_CHECK_HOOK_TRANSFORM_H_