NetBSD/include/ssp/ssp.h

90 lines
3.2 KiB
C

/* $NetBSD: ssp.h,v 1.13 2015/09/03 20:43:47 plunky Exp $ */
/*-
* Copyright (c) 2006, 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#ifndef _SSP_SSP_H_
#define _SSP_SSP_H_
#include <sys/cdefs.h>
#if !defined(__cplusplus)
# if _FORTIFY_SOURCE > 0 && !defined(__lint__) && \
(__OPTIMIZE__ > 0 || defined(__clang__)) && __GNUC_PREREQ__(4, 1)
# if _FORTIFY_SOURCE > 1
# define __SSP_FORTIFY_LEVEL 2
# else
# define __SSP_FORTIFY_LEVEL 1
# endif
# else
# define __SSP_FORTIFY_LEVEL 0
# endif
#else
# define __SSP_FORTIFY_LEVEL 0
#endif
/* __ssp_real is used by the implementation in libc */
#if __SSP_FORTIFY_LEVEL == 0
#define __ssp_real_(fun) fun
#else
#define __ssp_real_(fun) __ssp_real_ ## fun
#endif
#define __ssp_real(fun) __ssp_real_(fun)
#define __ssp_inline static __inline __attribute__((__always_inline__))
#define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1)
#define __ssp_bos0(ptr) __builtin_object_size(ptr, 0)
#define __ssp_check(buf, len, bos) \
if (bos(buf) != (size_t)-1 && len > bos(buf)) \
__chk_fail()
#define __ssp_redirect_raw(rtype, fun, symbol, args, call, cond, bos) \
rtype __ssp_real_(fun) args __RENAME(symbol); \
__ssp_inline rtype fun args __RENAME(__ssp_protected_ ## fun); \
__ssp_inline rtype fun args { \
if (cond) \
__ssp_check(__buf, __len, bos); \
return __ssp_real_(fun) call; \
}
#define __ssp_redirect(rtype, fun, args, call) \
__ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos)
#define __ssp_redirect0(rtype, fun, args, call) \
__ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos0)
#define __ssp_overlap(a, b, l) \
(((a) <= (b) && (b) < (a) + (l)) || ((b) <= (a) && (a) < (b) + (l)))
__BEGIN_DECLS
void __stack_chk_fail(void) __dead;
void __chk_fail(void) __dead;
__END_DECLS
#endif /* _SSP_SSP_H_ */