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 /* __ssp_real is used by the implementation in libc */ 37 #if __SSP_FORTIFY_LEVEL == 0 38 #define __ssp_real_(fun) fun 39 #else 40 #define __ssp_real_(fun) __ssp_real_ ## fun 41 #endif 42 #define __ssp_real(fun) __ssp_real_(fun) 43 44 #if __SSP_FORTIFY_LEVEL > 2 45 #define __ssp_bos(ptr) __builtin_dynamic_object_size(ptr, 1) 46 #define __ssp_bos0(ptr) __builtin_dynamic_object_size(ptr, 0) 47 #define __ssp_bos_known(ptr) \ 48 (__builtin_object_size(ptr, 0) != (size_t)-1 \ 49 || !__builtin_constant_p(__ssp_bos(ptr))) 50 #else 51 #define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1) 52 #define __ssp_bos0(ptr) __builtin_object_size(ptr, 0) 53 #define __ssp_bos_known(ptr) (__ssp_bos0(ptr) != (size_t)-1) 54 #endif 55 56 #define __ssp_check(buf, len, bos) \ 57 if (__ssp_bos_known(buf) && len > bos(buf)) \ 58 __chk_fail() 59 #define __ssp_decl(rtype, fun, args) \ 60 rtype __ssp_real_(fun) args __asm__(__ASMNAME(#fun)); \ 61 __declare_extern_inline(rtype) fun args 62 #define __ssp_redirect_raw(rtype, fun, args, call, cond, bos) \ 63 __ssp_decl(rtype, fun, args) \ 64 { \ 65 if (cond) \ 66 __ssp_check(__buf, __len, bos); \ 67 return __ssp_real_(fun) call; \ 68 } 69 70 #define __ssp_redirect(rtype, fun, args, call) \ 71 __ssp_redirect_raw(rtype, fun, args, call, 1, __ssp_bos) 72 #define __ssp_redirect0(rtype, fun, args, call) \ 73 __ssp_redirect_raw(rtype, fun, args, call, 1, __ssp_bos0) 74 75 #define __ssp_overlap(a, b, l) \ 76 (((a) <= (b) && (b) < (a) + (l)) || ((b) <= (a) && (a) < (b) + (l))) 77 78 __BEGIN_DECLS 79 void __stack_chk_fail(void) __dead2; 80 void __chk_fail(void) __dead2; 81 void set_fortify_handler (void (*handler) (int sig)); 82 __END_DECLS 83 84 #endif /* _SSP_SSP_H_ */ 85
