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