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-rw-r--r--third_party/libwebrtc/rtc_base/zero_memory.cc38
1 files changed, 38 insertions, 0 deletions
diff --git a/third_party/libwebrtc/rtc_base/zero_memory.cc b/third_party/libwebrtc/rtc_base/zero_memory.cc
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+++ b/third_party/libwebrtc/rtc_base/zero_memory.cc
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+/*
+ * Copyright 2017 The WebRTC Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#if defined(WEBRTC_WIN)
+#include <windows.h>
+#else
+#include <string.h>
+#endif
+
+#include "rtc_base/checks.h"
+#include "rtc_base/zero_memory.h"
+
+namespace rtc {
+
+// Code and comment taken from "OPENSSL_cleanse" of BoringSSL.
+void ExplicitZeroMemory(void* ptr, size_t len) {
+ RTC_DCHECK(ptr || !len);
+#if defined(WEBRTC_WIN)
+ SecureZeroMemory(ptr, len);
+#else
+ memset(ptr, 0, len);
+#if !defined(__pnacl__)
+ /* As best as we can tell, this is sufficient to break any optimisations that
+ might try to eliminate "superfluous" memsets. If there's an easy way to
+ detect memset_s, it would be better to use that. */
+ __asm__ __volatile__("" : : "r"(ptr) : "memory"); // NOLINT
+#endif
+#endif // !WEBRTC_WIN
+}
+
+} // namespace rtc