49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* See LICENSE file for copyright and license details. */
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#ifndef FORTIFY_UNISTD_H_
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#define FORTIFY_UNISTD_H_
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#include_next <unistd.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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__errordecl(__pread_error, "pread: buffer overflow detected");
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static inline __attribute__ ((always_inline))
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ssize_t
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__fortify_pread(int fd, void *buf, size_t n, off_t offset)
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{
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size_t bos = __builtin_object_size(buf, 0);
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if (__builtin_constant_p(n) && n > bos)
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__pread_error();
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if (n > bos)
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__builtin_trap();
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return pread(fd, buf, n, offset);
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}
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__errordecl(__read_error, "read: buffer overflow detected");
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static inline __attribute__ ((always_inline))
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ssize_t
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__fortify_read(int fd, void *buf, size_t n)
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{
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size_t bos = __builtin_object_size(buf, 0);
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if (__builtin_constant_p(n) && n > bos)
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__read_error();
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if (n > bos)
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__builtin_trap();
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return read(fd, buf, n);
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}
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#undef pread
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#define pread(fd, buf, n, offset) __fortify_pread(fd, buf, n, offset)
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#undef read
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#define read(fd, buf, n) __fortify_read(fd, buf, n)
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#endif
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#endif
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