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33 lines
1.3 KiB
C
33 lines
1.3 KiB
C
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// Copyright 2021 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_STACK_CANARY_LINUX_H_
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#define BASE_STACK_CANARY_LINUX_H_
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#include "base/base_export.h"
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namespace base {
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// This resets the reference stack canary to a new random value, which is
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// useful when forking so multiple processes don't have the same canary (which
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// makes it easy to brute force). All functions called from here on out will
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// use the new stack canary. However, functions that are on the call stack at
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// the time of calling this function are now unsafe to return from unless they
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// have the no_stack_protector attribute.
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//
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// On ARM we require the process to be single-threaded, as this function needs
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// to edit a read-only page containing the canary.
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void BASE_EXPORT ResetStackCanaryIfPossible();
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// After this is called, any canary mismatch is considered to be due to a
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// change in the reference canary (see ResetStackCanaryIfPossible()) rather
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// than a stack corruption. Instead of immediately crashing, emit a useful
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// debug message that explains how to avoid the crash.
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// Has no effect is non-debug builds.
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void BASE_EXPORT SetStackSmashingEmitsDebugMessage();
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} // namespace base
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#endif // BASE_STACK_CANARY_LINUX_H_
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