include/ssp/ssp.h

   1 /*      $NetBSD: ssp.h,v 1.6 2011/01/20 02:58:17 christos 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31 #ifndef _SSP_SSP_H_
  32 #define _SSP_SSP_H_
  33
  34 #include <sys/cdefs.h>
  35
  36 #if !defined(__cplusplus)
  37 # if _FORTIFY_SOURCE > 0 && __OPTIMIZE__ > 0 && __GNUC_PREREQ__(4, 1)
  38 #  if _FORTIFY_SOURCE > 1
  39 #   define __SSP_FORTIFY_LEVEL 2
  40 #  else
  41 #   define __SSP_FORTIFY_LEVEL 1
  42 #  endif
  43 # endif
  44 #endif
  45
  46 #ifdef _NAMESPACE_H_
  47 #define __ssp_weak_name(fun) _sys ## fun
  48 #else
  49 #define __ssp_weak_name(fun) _sys_ ## fun
  50 #endif
  51
  52 #define __ssp_inline static __inline __attribute__((__always_inline__))
  53
  54 #define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1)
  55 #define __ssp_bos0(ptr) __builtin_object_size(ptr, 0)
  56
  57 #define __ssp_redirect_raw(rtype, fun, args, call, bos) \
  58 rtype __ssp_weak_name(fun) args; \
  59 __ssp_inline rtype fun args; \
  60 __ssp_inline rtype fun args { \
  61         if (bos(__buf) != (size_t)-1 && __len > bos(__buf)) \
  62                 __chk_fail(); \
  63         return __ssp_weak_name(fun) call; \
  64 }
  65
  66 #define __ssp_redirect(rtype, fun, args, call) \
  67     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos)
  68 #define __ssp_redirect0(rtype, fun, args, call) \
  69     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos0)
  70
  71 __BEGIN_DECLS
  72 void __stack_chk_fail(void) __dead;
  73 void __chk_fail(void) __dead;
  74 __END_DECLS
  75
  76 #endif /* _SSP_SSP_H_ */