86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* $NetBSD: kern_ssp.c,v 1.7 2016/12/06 02:55:42 christos Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: kern_ssp.c,v 1.7 2016/12/06 02:55:42 christos Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/intr.h>
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#include <sys/cprng.h>
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#if defined(__SSP__) || defined(__SSP_ALL__)
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# ifdef _RUMPKERNEL
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__weak_alias(__stack_chk_guard, stack_chk_guard)
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__weak_alias(__stack_chk_fail, stack_chk_fail)
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# define SSP_STATIC static __used
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# else
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# define stack_chk_guard __stack_chk_guard
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# define stack_chk_fail __stack_chk_fail
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# define SSP_STATIC
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#endif
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SSP_STATIC long stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0,};
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SSP_STATIC void stack_chk_fail(void);
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SSP_STATIC void
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stack_chk_fail(void)
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{
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panic("stack overflow detected; terminated");
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}
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void
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ssp_init(void)
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{
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int s;
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aprint_debug("Initializing SSP: ");
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/*
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* We initialize ssp here carefully:
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* 1. after we got some entropy
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* 2. without calling a function
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*/
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size_t i;
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long guard[__arraycount(stack_chk_guard)];
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cprng_fast(guard, sizeof(guard));
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s = splhigh();
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for (i = 0; i < __arraycount(guard); i++)
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stack_chk_guard[i] = guard[i];
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splx(s);
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for (i = 0; i < __arraycount(guard); i++)
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aprint_debug("%lx ", guard[i]);
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aprint_debug("\n");
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}
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#else
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void
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ssp_init(void)
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{
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}
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#endif
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