include/ssp/ssp.h

   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_alias_name(fun) __ ## fun ## _alias
  54 #ifdef _NAMESPACE_H_
  55 #define __ssp_alias_func(fun, args) ___ ## fun ## _alias args
  56 #else
  57 #define __ssp_alias_func(fun, args) __ssp_alias_name(fun) args
  58 #endif
  59 #define __ssp_inline static __inline __attribute__((__always_inline__))
  60 #define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1)
  61 #define __ssp_bos0(ptr) __builtin_object_size(ptr, 0)
  62 #define __ssp_redirect_raw(rtype, fun, args, call, bos) \
  63 __ssp_inline rtype __ssp_alias_name(fun) args; \
  64 __ssp_inline rtype __ssp_alias_name(fun) args { \
  65         if (bos(__buf) != (size_t)-1 && __len > bos(__buf)) \
  66                 __chk_fail(); \
  67         return fun call; \
  68 }
  69
  70 #define __ssp_redirect(rtype, fun, args, call) \
  71     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos)
  72 #define __ssp_redirect0(rtype, fun, args, call) \
  73     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos0)
  74
  75 __BEGIN_DECLS
  76 void __stack_chk_fail(void) __attribute__((__noreturn__));
  77 void __chk_fail(void) __attribute__((__noreturn__));
  78 __END_DECLS
  79
  80 #endif /* _SSP_SSP_H_ */