| 1 | /* $NetBSD: ssp.h,v 1.13 2015/09/03 20:43:47 plunky Exp $ */ |
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| 2 | |
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| 3 | /*- |
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| 4 | * Copyright (c) 2006, 2011 The NetBSD Foundation, Inc. |
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| 5 | * All rights reserved. |
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| 6 | * |
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| 7 | * This code is derived from software contributed to The NetBSD Foundation |
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| 8 | * by Christos Zoulas. |
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| 9 | * |
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| 10 | * Redistribution and use in source and binary forms, with or without |
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| 11 | * modification, are permitted provided that the following conditions |
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| 12 | * are met: |
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| 13 | * 1. Redistributions of source code must retain the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer. |
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 16 | * notice, this list of conditions and the following disclaimer in the |
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| 17 | * documentation and/or other materials provided with the distribution. |
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| 18 | * |
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
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| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
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| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
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| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 29 | * POSSIBILITY OF SUCH DAMAGE. |
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| 30 | */ |
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| 31 | #ifndef _SSP_SSP_H_ |
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| 32 | #define _SSP_SSP_H_ |
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| 33 | |
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| 34 | #include <sys/cdefs.h> |
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| 35 | |
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| 36 | /* __ssp_real is used by the implementation in libc */ |
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| 37 | #if __SSP_FORTIFY_LEVEL == 0 |
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| 38 | #define __ssp_real_(fun) fun |
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| 39 | #else |
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| 40 | #define __ssp_real_(fun) __ssp_real_ ## fun |
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| 41 | #endif |
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| 42 | #define __ssp_real(fun) __ssp_real_(fun) |
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| 43 | |
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| 44 | #define __ssp_inline extern __inline__ __attribute__((__always_inline__, __gnu_inline__)) |
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| 45 | |
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| 46 | #define __ssp_bos(ptr) __builtin_object_size(ptr, __SSP_FORTIFY_LEVEL > 1) |
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| 47 | #define __ssp_bos0(ptr) __builtin_object_size(ptr, 0) |
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| 48 | |
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| 49 | #define __ssp_check(buf, len, bos) \ |
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| 50 | if (bos(buf) != (size_t)-1 && len > bos(buf)) \ |
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| 51 | __chk_fail() |
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| 52 | #define __ssp_decl(rtype, fun, args) \ |
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| 53 | rtype __ssp_real_(fun) args __asm__(__ASMNAME(#fun)); \ |
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| 54 | __ssp_inline rtype fun args __asm__(__ASMNAME("__ssp_protected_" #fun)); \ |
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| 55 | __ssp_inline rtype fun args |
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| 56 | #define __ssp_redirect_raw(rtype, fun, args, call, cond, bos) \ |
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| 57 | __ssp_decl(rtype, fun, args) \ |
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| 58 | { \ |
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| 59 | if (cond) \ |
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| 60 | __ssp_check(__buf, __len, bos); \ |
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| 61 | return __ssp_real_(fun) call; \ |
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| 62 | } |
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| 63 | |
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| 64 | #define __ssp_redirect(rtype, fun, args, call) \ |
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| 65 | __ssp_redirect_raw(rtype, fun, args, call, 1, __ssp_bos) |
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| 66 | #define __ssp_redirect0(rtype, fun, args, call) \ |
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| 67 | __ssp_redirect_raw(rtype, fun, args, call, 1, __ssp_bos0) |
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| 68 | |
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| 69 | #define __ssp_overlap(a, b, l) \ |
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| 70 | (((a) <= (b) && (b) < (a) + (l)) || ((b) <= (a) && (a) < (b) + (l))) |
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| 71 | |
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| 72 | __BEGIN_DECLS |
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| 73 | void __stack_chk_fail(void) __dead2; |
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| 74 | void __chk_fail(void) __dead2; |
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| 75 | __END_DECLS |
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| 76 | |
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| 77 | #endif /* _SSP_SSP_H_ */ |
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