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ssp.h revision 1.1 
      1 /*	$NetBSD: ssp.h,v 1.1 2007/05/30 01:17:35 tls Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 #ifndef _SSP_SSP_H_
     39 #define _SSP_SSP_H_
     40 
     41 #include <sys/cdefs.h>
     42 
     43 #if !defined(__cplusplus)
     44 # if _FORTIFY_SOURCE > 0 && __OPTIMIZE__ > 0 && __GNUC_PREREQ__(4, 1)
     45 #  if _FORTIFY_SOURCE > 1
     46 #   define __SSP_FORTIFY_LEVEL 2
     47 #  else
     48 #   define __SSP_FORTIFY_LEVEL 1
     49 #  endif
     50 # endif
     51 #endif
     52 
     53 #define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1)
     54 #define __ssp_bos0(ptr) __builtin_object_size(ptr, 0)
     55 #define __ssp_redirect_raw(rtype, fun, args, call, bos) \
     56 static __inline __attribute__((__always_inline__)) rtype __ ## fun ## _alias args; \
     57 static __inline __attribute__((__always_inline__)) rtype \
     58     __ ## fun ## _alias args { \
     59 	    if (bos(__buf) != (size_t)-1 && __len > bos(__buf)) \
     60 		    __chk_fail(); \
     61 	    return fun call; \
     62     }
     63 
     64 #define __ssp_redirect(rtype, fun, args, call) \
     65     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos)
     66 #define __ssp_redirect0(rtype, fun, args, call) \
     67     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos0)
     68 
     69 __BEGIN_DECLS
     70 void __stack_chk_fail(void) __attribute__((__noreturn__));
     71 void __chk_fail(void) __attribute__((__noreturn__));
     72 __END_DECLS
     73 
     74 #endif /* _SSP_SSP_H_ */
     75