64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
/* See LICENSE file for copyright and license details. */
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#ifndef FORTIFY_STDIO_H_
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#define FORTIFY_STDIO_H_
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#include_next <stdio.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(__fgets_error, "fgets: buffer overflow detected");
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static inline __attribute__ ((always_inline))
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char *
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__fortify_fgets(char *s, int n, FILE *fp)
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{
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size_t bos = __builtin_object_size(s, 0);
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if (__builtin_constant_p(n) && (size_t)n > bos)
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__fgets_error();
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if ((size_t)n > bos)
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__builtin_trap();
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return fgets(s, n, fp);
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}
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__errordecl(__vsnprintf_error, "vsnprintf: buffer overflow detected");
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static inline
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__attribute__ ((always_inline))
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__attribute__ ((__format__ (printf, 3, 0)))
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__attribute__ ((__nonnull__ (3)))
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int
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__fortify_vsnprintf(char *s, size_t n, const char *fmt, __builtin_va_list ap)
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{
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size_t bos = __builtin_object_size(s, 0);
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if (__builtin_constant_p(n) && n > bos)
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__vsnprintf_error();
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if (n > bos)
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__builtin_trap();
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return vsnprintf(s, n, fmt, ap);
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}
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#undef fgets
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#define fgets(s, n, fp) __fortify_fgets(s, n, fp)
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#undef vsnprintf
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#define vsnprintf(s, n, fmt, ap) __fortify_vsnprintf(s, n, fmt, ap)
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__errordecl(__snprintf_error, "snprintf: buffer overflow detected");
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#undef snprintf
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#define snprintf(s, n, fmt, ...) ({ \
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size_t _n = (n); \
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size_t bos = __builtin_object_size(s, 0); \
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if (__builtin_constant_p(_n) && _n > bos) \
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__snprintf_error(); \
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if (_n > bos) \
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__builtin_trap(); \
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snprintf(s, _n, fmt, ## __VA_ARGS__); \
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})
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#endif
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#endif
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