91 lines
3.1 KiB
C
91 lines
3.1 KiB
C
/* compiler_stack_protect.c - Compiler stack protection (kernel part) */
|
|
|
|
/*
|
|
* Copyright (c) 2012-2014 Wind River Systems, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1) Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2) 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.
|
|
*
|
|
* 3) Neither the name of Wind River Systems 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 HOLDER 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.
|
|
*/
|
|
|
|
/*
|
|
DESCRIPTION
|
|
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 */
|
|
|
|
#if defined(CONFIG_STACK_CANARIES)
|
|
|
|
#include <nano_private.h>
|
|
#include <toolchain.h>
|
|
#include <sections.h>
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* _StackCheckHandler - stack canary error handler
|
|
*
|
|
* This function is invoked when a stack canary error is detected.
|
|
*
|
|
* RETURNS: 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);
|
|
}
|
|
|
|
#endif /* CONFIG_STACK_CANARIES */
|
|
|
|
#ifdef CONFIG_STACK_CANARIES
|
|
|
|
/* Global variable */
|
|
|
|
/*
|
|
* Symbol referenced by GCC compiler generated code for canary value.
|
|
* The canary value gets initialized in _Cstart().
|
|
*/
|
|
|
|
void __noinit *__stack_chk_guard;
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* __stack_chk_fail - 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);
|
|
#endif
|