| /* |
| * Copyright (c) 2012-2014 Wind River Systems, Inc. |
| * |
| * 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. |
| */ |
| |
| /** |
| * @file |
| * @brief Compiler stack protection (kernel part) |
| * |
| * This module provides functions to support compiler stack protection |
| * using canaries. This feature is enabled with configuration |
| * CONFIG_STACK_CANARIES=y. |
| * |
| * When this feature is enabled, the compiler generated code refers to |
| * function __stack_chk_fail and global variable __stack_chk_guard. |
| */ |
| |
| #include <toolchain.h> /* compiler specific configurations */ |
| |
| #include <kernel_structs.h> |
| #include <toolchain.h> |
| #include <sections.h> |
| |
| /** |
| * |
| * @brief Stack canary error handler |
| * |
| * This function is invoked when a stack canary error is detected. |
| * |
| * @return Does not return |
| */ |
| void FUNC_NORETURN _StackCheckHandler(void) |
| { |
| /* Stack canary error is a software fatal condition; treat it as such. |
| */ |
| |
| _NanoFatalErrorHandler(_NANO_ERR_STACK_CHK_FAIL, &_default_esf); |
| } |
| |
| /* Global variable */ |
| |
| /* |
| * Symbol referenced by GCC compiler generated code for canary value. |
| * The canary value gets initialized in _Cstart(). |
| */ |
| void __noinit *__stack_chk_guard; |
| |
| /** |
| * |
| * @brief Referenced by GCC compiler generated code |
| * |
| * This routine is invoked when a stack canary error is detected, indicating |
| * a buffer overflow or stack corruption problem. |
| */ |
| FUNC_ALIAS(_StackCheckHandler, __stack_chk_fail, void); |