1 /* $NetBSD: ssp.h,v 1.9 2011/02/21 00:40:08 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 2006, 2011 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 # else 44 # define __SSP_FORTIFY_LEVEL 0 45 # endif 46 #else 47 # define __SSP_FORTIFY_LEVEL 0 48 #endif 49 50 /* __ssp_real is used by the implementation in libc */ 51 #if __SSP_FORTIFY_LEVEL == 0 52 #define __ssp_real_(fun) fun 53 #else 54 #define __ssp_real_(fun) __ssp_real_ ## fun 55 #endif 56 #define __ssp_real(fun) __ssp_real_(fun) 57 58 #define __ssp_inline static __inline __attribute__((__always_inline__)) 59 60 #define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1) 61 #define __ssp_bos0(ptr) __builtin_object_size(ptr, 0) 62 63 #define __ssp_check(buf, len, bos) \ 64 if (bos(buf) != (size_t)-1 && len > bos(buf)) \ 65 __chk_fail() 66 #define __ssp_redirect_raw(rtype, fun, symbol, args, call, bos) \ 67 rtype __ssp_real_(fun) args __RENAME(symbol); \ 68 __ssp_inline rtype fun args __RENAME(__ssp_protected_ ## fun); \ 69 __ssp_inline rtype fun args { \ 70 __ssp_check(__buf, __len, bos); \ 71 return __ssp_real_(fun) call; \ 72 } 73 74 #define __ssp_redirect(rtype, fun, args, call) \ 75 __ssp_redirect_raw(rtype, fun, fun, args, call, __ssp_bos) 76 #define __ssp_redirect0(rtype, fun, args, call) \ 77 __ssp_redirect_raw(rtype, fun, fun, args, call, __ssp_bos0) 78 79 __BEGIN_DECLS 80 void __stack_chk_fail(void) __dead; 81 void __chk_fail(void) __dead; 82 __END_DECLS 83 84 #endif /* _SSP_SSP_H_ */ 85