1 /* $NetBSD: ssp.h,v 1.13 2015/09/03 20:43:47 plunky 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 && !defined(__lint__) && \ 38 (__OPTIMIZE__ > 0 || defined(__clang__)) && __GNUC_PREREQ__(4, 1) 39 # if _FORTIFY_SOURCE > 1 40 # define __SSP_FORTIFY_LEVEL 2 41 # else 42 # define __SSP_FORTIFY_LEVEL 1 43 # endif 44 # else 45 # define __SSP_FORTIFY_LEVEL 0 46 # endif 47 #else 48 # define __SSP_FORTIFY_LEVEL 0 49 #endif 50 51 /* __ssp_real is used by the implementation in libc */ 52 #if __SSP_FORTIFY_LEVEL == 0 53 #define __ssp_real_(fun) fun 54 #else 55 #define __ssp_real_(fun) __ssp_real_ ## fun 56 #endif 57 #define __ssp_real(fun) __ssp_real_(fun) 58 59 #define __ssp_inline static __inline __attribute__((__always_inline__)) 60 61 #define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1) 62 #define __ssp_bos0(ptr) __builtin_object_size(ptr, 0) 63 64 #define __ssp_check(buf, len, bos) \ 65 if (bos(buf) != (size_t)-1 && len > bos(buf)) \ 66 __chk_fail() 67 #define __ssp_redirect_raw(rtype, fun, symbol, args, call, cond, bos) \ 68 rtype __ssp_real_(fun) args __RENAME(symbol); \ 69 __ssp_inline rtype fun args __RENAME(__ssp_protected_ ## fun); \ 70 __ssp_inline rtype fun args { \ 71 if (cond) \ 72 __ssp_check(__buf, __len, bos); \ 73 return __ssp_real_(fun) call; \ 74 } 75 76 #define __ssp_redirect(rtype, fun, args, call) \ 77 __ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos) 78 #define __ssp_redirect0(rtype, fun, args, call) \ 79 __ssp_redirect_raw(rtype, fun, fun, args, call, 1, __ssp_bos0) 80 81 #define __ssp_overlap(a, b, l) \ 82 (((a) <= (b) && (b) < (a) + (l)) || ((b) <= (a) && (a) < (b) + (l))) 83 84 __BEGIN_DECLS 85 void __stack_chk_fail(void) __dead; 86 void __chk_fail(void) __dead; 87 __END_DECLS 88 89 #endif /* _SSP_SSP_H_ */ 90