fortify-headers

standalone fortify-source implementation
git clone git://git.2f30.org/fortify-headers
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fortify-headers.h (2745B)

      1 /*
      2  * Copyright (C) 2015-2016 Dimitris Papastamos <sin@2f30.org>
      3  * Copyright (C) 2022 q66 <q66@chimera-linux.org>
      4  *
      5  * Permission to use, copy, modify, and/or distribute this software for any
      6  * purpose with or without fee is hereby granted.
      7  *
      8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     15  */
     16 
     17 #ifndef _FORTIFY_HEADERS_H
     18 #define _FORTIFY_HEADERS_H
     19 
     20 #ifdef __clang__
     21 
     22 #if _FORTIFY_SOURCE > 2 && defined __has_attribute && __has_attribute(pass_dynamic_object_size)
     23 #define _FORTIFY_POSN(n) const __attribute__((pass_dynamic_object_size(n)))
     24 #else
     25 /* clang uses overloads; see https://github.com/llvm/llvm-project/issues/53516 */
     26 #define _FORTIFY_POSN(n) const __attribute__((pass_object_size__(n)))
     27 #endif
     28 
     29 /* we can't use extern inline with overloads without making them external */
     30 #ifdef __cplusplus
     31 #define _FORTIFY_INLINE __inline__ \
     32         __attribute__((__always_inline__,__artificial__,__overloadable__))
     33 #else
     34 #define _FORTIFY_INLINE static __inline__ \
     35 	__attribute__((__always_inline__,__artificial__,__overloadable__))
     36 #endif
     37 
     38 #else /* !__clang__ */
     39 
     40 #define _FORTIFY_POSN(n)
     41 #define _FORTIFY_INLINE extern __inline__ \
     42 	__attribute__((__always_inline__,__gnu_inline__,__artificial__))
     43 
     44 #endif /* __clang__ */
     45 
     46 #define _FORTIFY_POS0 _FORTIFY_POSN(0)
     47 #define _FORTIFY_POS1 _FORTIFY_POSN(1)
     48 #define _FORTIFY_POS2 _FORTIFY_POSN(2)
     49 
     50 #define _FORTIFY_STR(s) #s
     51 #define _FORTIFY_ORIG(p,fn) __typeof__(fn) __orig_##fn __asm__(_FORTIFY_STR(p) #fn)
     52 #define _FORTIFY_FNB(fn) _FORTIFY_ORIG(__USER_LABEL_PREFIX__,fn)
     53 #define _FORTIFY_FN(fn) _FORTIFY_FNB(fn); _FORTIFY_INLINE
     54 
     55 
     56 #if _FORTIFY_SOURCE > 2 && defined __has_builtin && __has_builtin (__builtin_dynamic_object_size)
     57 #define __bos(ptr, type) __builtin_dynamic_object_size (ptr, type)
     58 #else
     59 #define __bos(ptr, type) __builtin_object_size (ptr, type)
     60 #endif
     61 
     62 #if defined __has_attribute
     63 
     64 #if __has_attribute (access)
     65 #define __access(...) __attribute__ ((access (__VA_ARGS__)))
     66 #else
     67 #define __access(...)
     68 #endif
     69 
     70 #if __has_attribute (format)
     71 #define __format(...) __attribute__ ((format (__VA_ARGS__)))
     72 #else
     73 #define __format(...)
     74 #endif
     75 
     76 #if __has_attribute (__diagnose_if)
     77 #define __warning_if(cond, msg) __attribute__ ((__diagnose_if (cond, msg, "warning")))
     78 #else
     79 #define __warning_if(cond, msg)
     80 #endif
     81 
     82 #endif
     83 
     84 #endif