53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/* See LICENSE file for copyright and license details. */
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#ifndef FORTIFY_STRINGS_H_
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#define FORTIFY_STRINGS_H_
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#include_next <strings.h>
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#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
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#define __errordecl(name, msg) extern void name(void) __attribute__((__error__(msg)))
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_POSIX_SOURCE) \
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|| (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE+0 < 200809L) \
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|| (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE+0 < 700)
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__errordecl(__bcopy_error, "bcopy: buffer overflow detected");
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static inline __attribute__ ((always_inline))
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void
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__fortify_bcopy(const void *src, void *dest, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (__builtin_constant_p(n) && n > bos)
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__bcopy_error();
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if (n > bos)
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__builtin_trap();
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return bcopy(src, dest, n);
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}
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__errordecl(__bzero_error, "bzero: buffer overflow detected");
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static inline __attribute__ ((always_inline))
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void
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__fortify_bzero(void *src, size_t n)
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{
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size_t bos = __builtin_object_size(src, 0);
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if (__builtin_constant_p(n) && n > bos)
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__bzero_error();
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if (n > bos)
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__builtin_trap();
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return bzero(src, n);
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}
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#undef bcopy
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#define bcopy(src, dest, n) __fortify_bcopy(src, dest, n)
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#undef bzero
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#define bzero(src, n) __fortify_bzero(src, n)
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#endif
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#endif
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#endif
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