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

     /*
      * Copyright (c) 2002 Hiroaki Etoh.
      * 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 AUTHORS ``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 AUTHORS 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/param.h>
    #include <sys/endian.h>
    #ifndef _KERNEL
    extern void panic(const char *, ...);
    #endif
    
    void __stack_smash_handler(char[], int);
    
    #if BYTE_ORDER == LITTLE_ENDIAN
    int __guard = 0x00000aff;
    #else
    int __guard = 0xff0a0000;
    #endif
    
    void 
    __stack_smash_handler(char func[], int damaged)
    {
    #ifdef __i386__
            void *caller;
            __asm __volatile("movl 4(%%ebp), %0" : "=r" (caller));
            panic("stack overflow in function %p (%s)", caller, func);
    #else
            panic("stack overflow in function %s", func);
    #endif
    }

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