The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/libkern/stack_protector.c

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    1 /*
    2  * Copyright (c) 2008 Apple Computer, Inc. All rights reserved.
    3  *
    4  * %Begin-Header%
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, and the entire permission notice in its entirety,
   10  *    including the disclaimer of warranties.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote
   15  *    products derived from this software without specific prior
   16  *    written permission.
   17  * 
   18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
   19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
   21  * WHICH ARE HEREBY DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE
   22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
   24  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
   25  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   26  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
   28  * USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
   29  * DAMAGE.
   30  * %End-Header%
   31  */
   32 
   33 /*******************************************************************************
   34 * NOTE: This implementation of the stack check routines required by the GCC
   35 * -fstack-protector flag is only safe for kernel extensions.
   36 *******************************************************************************/
   37 
   38 #include <sys/types.h>
   39 #include <sys/random.h>
   40 #include <kern/debug.h>
   41 
   42 long __stack_chk_guard[8];
   43 void __stack_chk_fail(void);
   44 
   45 static void __guard_setup(void) __attribute__((constructor));
   46 
   47 static void
   48 __guard_setup(void)
   49 {
   50     /* Cannot report failure.  */
   51     read_random(__stack_chk_guard, sizeof(__stack_chk_guard));
   52 }
   53 
   54 void
   55 __stack_chk_fail(void)
   56 {
   57     panic("Kernel stack memory corruption detected");
   58 }
   59 

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