/* $Id$ */
/* Copyright (c) 2015-2016 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS System libc */
/* All rights reserved.
 *
 * 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.
 *
 * 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. */



#include "sys/sysctl.h"
#include "unistd.h"
#include "stdlib.h"
#include "syscalls.h"
#include "ssp.h"


#if defined(__SSP__)
/* variables */
/* default to the "terminator canary" */
long __stack_chk_guard[8] = { 0, 0, '\n', 255, 0, 0, 0, 0 };


/* functions */
/* stack_chk_fail */
void __stack_chk_fail(void)
{
	const char buf[] = "stack overflow detected: terminated\n";

	/* output on the standard error stream */
	write(2, buf, sizeof(buf) - 1);
	/* trigger a crash */
	abort();
	_exit(127);
}


/* stack_chk_setup */
void __stack_chk_setup(void)
{
	size_t i;

	if(__stack_chk_guard[0] == 0)
		for(i = 0; i < sizeof(__stack_chk_guard)
				/ sizeof(*__stack_chk_guard); i++)
			__stack_chk_guard[i] = arc4random();
}
#endif