blob: 2ee2d81c7a32017e7960b310b94f8b5443b9a9ce [file] [log] [blame]
/*
* Copyright (c) 2012-2014 Wind River Systems, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @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 <zephyr/toolchain.h> /* compiler specific configurations */
#include <zephyr/kernel_structs.h>
#include <zephyr/toolchain.h>
#include <zephyr/linker/sections.h>
#include <zephyr/kernel.h>
#include <zephyr/app_memory/app_memdomain.h>
/**
*
* @brief Stack canary error handler
*
* This function is invoked when a stack canary error is detected.
*
* @return Does not return
*/
void _StackCheckHandler(void)
{
/* Stack canary error is a software fatal condition; treat it as such.
*/
z_except_reason(K_ERR_STACK_CHK_FAIL);
CODE_UNREACHABLE; /* LCOV_EXCL_LINE */
}
/* Global variable */
/*
* Symbol referenced by GCC compiler generated code for canary value.
* The canary value gets initialized in z_cstart().
*/
#ifdef CONFIG_STACK_CANARIES_TLS
__thread uintptr_t __stack_chk_guard;
#elif CONFIG_USERSPACE
K_APP_DMEM(z_libc_partition) uintptr_t __stack_chk_guard;
#else
__noinit uintptr_t __stack_chk_guard;
#endif
/**
*
* @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);