code for encrypting sensitive tcmalloc metadata

third_party/tcmalloc/chromium/src/config_hardening.h

Index: third_party/tcmalloc/chromium/src/config_hardening.h
diff --git a/third_party/tcmalloc/chromium/src/config_hardening.h b/third_party/tcmalloc/chromium/src/config_hardening.h
new file mode 100644
index 0000000000000000000000000000000000000000..69ff076fc206a08b25763ce51c4fb1d7f1fc5552
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+++ b/third_party/tcmalloc/chromium/src/config_hardening.h
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+// Copyright (c) 2011, Google Inc.
+// 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.
+// ---
+// Author: Rebecca Shapiro
+//
+// Sets allocator hardening flags appropriately.
+
+#ifndef TCMALLOC_HARDENING_CONFIG_
+#define TCMALLOC_HARDENING_CONFIG_
+
+#ifdef TCMALLOC_HARDENED
+#define TCMALLOC_SPAN_ENCODE
+#define TCMALLOC_USE_DOUBLYLINKED_FREELIST
+#endif
+
+#endif  // TCMALLOC_HARDENING_CONFIG_