200 lines
4.3 KiB
C
200 lines
4.3 KiB
C
#ifndef FORTIFY_STRING_H_
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#define FORTIFY_STRING_H_
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#include_next <string.h>
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#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
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#ifdef __cplusplus
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extern "C" {
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#endif
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static inline __attribute__ ((always_inline))
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void *
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__fortify_memcpy(void *dest, const void *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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char *d = (char *)dest;
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const char *s = (const char *)src;
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/* trap if pointers are overlapping but not if dest == src.
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* gcc seems to like to generate code that relies on dest == src */
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if ((d < s && d + n > s) ||
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(s < d && s + n > d))
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__builtin_trap();
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if (n > bos)
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__builtin_trap();
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return memcpy(dest, src, n);
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}
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static inline __attribute__ ((always_inline))
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void *
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__fortify_memmove(void *dest, const void *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (n > bos)
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__builtin_trap();
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return memmove(dest, src, n);
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}
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static inline __attribute__ ((always_inline))
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void *
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__fortify_memset(void *dest, int c, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (n > bos)
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__builtin_trap();
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return memset(dest, c, n);
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}
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static inline __attribute__ ((always_inline))
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char *
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__fortify_stpcpy(char *dest, const char *src)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (strlen(src) + 1 > bos)
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__builtin_trap();
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return stpcpy(dest, src);
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}
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static inline __attribute__ ((always_inline))
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char *
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__fortify_stpncpy(char *dest, const char *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (n > bos)
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__builtin_trap();
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return stpncpy(dest, src, n);
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}
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static inline __attribute__ ((always_inline))
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char *
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__fortify_strcat(char *dest, const char *src)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (strlen(src) + strlen(dest) + 1 > bos)
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__builtin_trap();
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return strcat(dest, src);
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}
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static inline __attribute__ ((always_inline))
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char *
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__fortify_strcpy(char *dest, const char *src)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (strlen(src) + 1 > bos)
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__builtin_trap();
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return strcpy(dest, src);
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}
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static inline __attribute__ ((always_inline))
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char *
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__fortify_strncat(char *dest, const char *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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size_t slen, dlen;
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if (n > bos) {
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slen = strlen(src);
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dlen = strlen(dest);
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if (slen > n)
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slen = n;
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if (slen + dlen + 1 > bos)
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__builtin_trap();
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}
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return strncat(dest, src, n);
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}
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static inline __attribute__ ((always_inline))
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char *
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__fortify_strncpy(char *dest, const char *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (n > bos)
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__builtin_trap();
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return strncpy(dest, src, n);
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}
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#ifdef _GNU_SOURCE
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static inline __attribute__ ((always_inline))
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void *
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__fortify_mempcpy(void *dest, const void *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (n > bos)
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__builtin_trap();
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return mempcpy(dest, src, n);
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}
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#endif
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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static inline __attribute__ ((always_inline))
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size_t
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__fortify_strlcat(char *dest, const char *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (n > bos)
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__builtin_trap();
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return strlcat(dest, src, n);
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}
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static inline __attribute__ ((always_inline))
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size_t
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__fortify_strlcpy(char *dest, const char *src, size_t n)
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{
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size_t bos = __builtin_object_size(dest, 0);
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if (n > bos)
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__builtin_trap();
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return strlcpy(dest, src, n);
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}
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#endif
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#undef memcpy
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#define memcpy(dest, src, n) __fortify_memcpy(dest, src, n)
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#undef memmove
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#define memmove(dest, src, n) __fortify_memmove(dest, src, n)
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#undef memset
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#define memset(dest, src, n) __fortify_memset(dest, src, n)
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#undef stpcpy
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#define stpcpy(dest, src) __fortify_stpcpy(dest, src)
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#undef stpncpy
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#define stpncpy(dest, src, n) __fortify_stpncpy(dest, src, n)
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#undef strcat
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#define strcat(dest, src) __fortify_strcat(dest, src)
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#undef strcpy
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#define strcpy(dest, src) __fortify_strcpy(dest, src)
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#undef strncat
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#define strncat(dest, src, n) __fortify_strncat(dest, src, n)
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#undef strncpy
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#define strncpy(dest, src, n) __fortify_strncpy(dest, src, n)
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#ifdef _GNU_SOURCE
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#undef mempcpy
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#define mempcpy(dest, src, n) __fortify_mempcpy(dest, src, n)
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#endif
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#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
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#undef strlcat
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#define strlcat(dest, src, n) __fortify_strlcat(dest, src, n)
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#undef strlcpy
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#define strlcpy(dest, src, n) __fortify_strlcpy(dest, src, n)
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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#endif
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