kern_ssp.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*      $NetBSD: kern_ssp.c,v 1.2.4.3 2009/03/15 19:49:34 snj Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   26  * POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __KERNEL_RCSID(0, "$NetBSD: kern_ssp.c,v 1.2.4.3 2009/03/15 19:49:34 snj Exp $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/intr.h>
   35 
   36 #if defined(__SSP__) || defined(__SSP_ALL__)
   37 long __stack_chk_guard[8] = {0, 0, 0, 0, 0, 0, 0, 0};
   38 void __stack_chk_fail(void);
   39 
   40 void
   41 __stack_chk_fail(void)
   42 {
   43         panic("stack overflow detected; terminated");
   44 }
   45 
   46 void
   47 ssp_init(void)
   48 {
   49         int s;
   50 
   51 #ifdef DIAGNOSTIC
   52         printf("Initializing SSP:");
   53 #endif
   54         /*
   55          * We initialize ssp here carefully:
   56          *      1. after we got some entropy
   57          *      2. without calling a function
   58          */
   59         size_t i;
   60         long guard[__arraycount(__stack_chk_guard)];
   61 
   62         arc4randbytes(guard, sizeof(guard));
   63         s = splhigh();
   64         for (i = 0; i < __arraycount(guard); i++)
   65                 __stack_chk_guard[i] = guard[i];
   66         splx(s);
   67 #ifdef DIAGNOSTIC
   68         for (i = 0; i < __arraycount(guard); i++)
   69                 printf("%lx ", guard[i]);
   70         printf("\n");
   71 #endif
   72 }
   73 #else
   74 void
   75 ssp_init(void)
   76 {
   77 }
   78 #endif

Cache object: cceb8bb9e6957a92622c1285c66f0154

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/kern/kern_ssp.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_ssp.c