include/ssp/ssp.h

   1 /*      $NetBSD: ssp.h,v 1.2 2007/06/03 17:41:19 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 #define __ssp_alias_name(fun) __ ## fun ## _alias
  47 #ifdef _NAMESPACE_H_
  48 #define __ssp_alias_func(fun, args) ___ ## fun ## _alias args
  49 #else
  50 #define __ssp_alias_func(fun, args) __ssp_alias_name(fun) args
  51 #endif
  52 #define __ssp_inline static __inline __attribute__((__always_inline__))
  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 __ssp_inline rtype __ssp_alias_name(fun) args; \
  57 __ssp_inline rtype __ssp_alias_name(fun) args { \
  58         if (bos(__buf) != (size_t)-1 && __len > bos(__buf)) \
  59                 __chk_fail(); \
  60         return fun call; \
  61 }
  62
  63 #define __ssp_redirect(rtype, fun, args, call) \
  64     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos)
  65 #define __ssp_redirect0(rtype, fun, args, call) \
  66     __ssp_redirect_raw(rtype, fun, args, call, __ssp_bos0)
  67
  68 __BEGIN_DECLS
  69 void __stack_chk_fail(void) __attribute__((__noreturn__));
  70 void __chk_fail(void) __attribute__((__noreturn__));
  71 __END_DECLS
  72
  73 #endif /* _SSP_SSP_H_ */