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/* See LICENSE file for copyright and license details. */
#ifndef FORTIFY_STRING_H_
#define FORTIFY_STRING_H_
#include_next <string.h>
#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
#define __errordecl(name, msg) extern void name(void) __attribute__((__error__(msg)))
__errordecl(__memcpy_error, "memcpy: buffer overflow detected");
static inline __attribute__ ((always_inline))
void *
__fortify_memcpy(void *__restrict dest, const void *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
char *d = dest;
const char *s = src;
if (__builtin_constant_p(n) && n > bos)
__memcpy_error();
/* trap if pointers are overlapping but not if dest == src */
if ((d < s && d + n > s) ||
(s < d && s + n > d))
__builtin_trap();
if (n > bos)
__builtin_trap();
return memcpy(dest, src, n);
}
__errordecl(__memmove_error, "memmove: buffer overflow detected");
static inline __attribute__ ((always_inline))
void *
__fortify_memmove(void *__restrict dest, const void *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
if (__builtin_constant_p(n) && n > bos)
__memmove_error();
if (n > bos)
__builtin_trap();
return memmove(dest, src, n);
}
__errordecl(__memset_error, "memset: buffer overflow detected");
static inline __attribute__ ((always_inline))
void *
__fortify_memset(void *dest, int c, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
if (__builtin_constant_p(n) && n > bos)
__memset_error();
if (n > bos)
__builtin_trap();
return memset(dest, c, n);
}
static inline __attribute__ ((always_inline))
char *
__fortify_stpcpy(char *__restrict dest, const char *__restrict src)
{
size_t bos = __builtin_object_size(dest, 0);
if (strlen(src) + 1 > bos)
__builtin_trap();
return stpcpy(dest, src);
}
__errordecl(__stpncpy_error, "stpncpy: buffer overflow detected");
static inline __attribute__ ((always_inline))
char *
__fortify_stpncpy(char *__restrict dest, const char *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
if (__builtin_constant_p(n) && n > bos)
__stpncpy_error();
if (n > bos)
__builtin_trap();
return stpncpy(dest, src, n);
}
static inline __attribute__ ((always_inline))
char *
__fortify_strcat(char *__restrict dest, const char *__restrict src)
{
size_t bos = __builtin_object_size(dest, 0);
if (strlen(src) + strlen(dest) + 1 > bos)
__builtin_trap();
return strcat(dest, src);
}
static inline __attribute__ ((always_inline))
char *
__fortify_strcpy(char *__restrict dest, const char *__restrict src)
{
size_t bos = __builtin_object_size(dest, 0);
if (strlen(src) + 1 > bos)
__builtin_trap();
return strcpy(dest, src);
}
__errordecl(__strncat_error, "strncat: buffer overflow detected");
static inline __attribute__ ((always_inline))
char *
__fortify_strncat(char *__restrict dest, const char *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
size_t slen, dlen;
if (__builtin_constant_p(n) && n > bos)
__strncat_error();
if (n > bos) {
slen = strlen(src);
dlen = strlen(dest);
if (slen > n)
slen = n;
if (slen + dlen + 1 > bos)
__builtin_trap();
}
return strncat(dest, src, n);
}
__errordecl(__strncpy_error, "strncpy: buffer overflow detected");
static inline __attribute__ ((always_inline))
char *
__fortify_strncpy(char *__restrict dest, const char *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
if (__builtin_constant_p(n) && n > bos)
__strncpy_error();
if (n > bos)
__builtin_trap();
return strncpy(dest, src, n);
}
#ifdef _GNU_SOURCE
__errordecl(__mempcpy_error, "mempcpy: buffer overflow detected");
static inline __attribute__ ((always_inline))
void *
__fortify_mempcpy(void *__restrict dest, const void *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
if (__builtin_constant_p(n) && n > bos)
__mempcpy_error();
if (n > bos)
__builtin_trap();
return mempcpy(dest, src, n);
}
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
__errordecl(__strlcat_error, "strlcat: buffer overflow detected");
static inline __attribute__ ((always_inline))
size_t
__fortify_strlcat(char *__restrict dest, const char *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
if (__builtin_constant_p(n) && n > bos)
__strlcat_error();
if (n > bos)
__builtin_trap();
return strlcat(dest, src, n);
}
__errordecl(__strlcpy_error, "strlcpy: buffer overflow detected");
static inline __attribute__ ((always_inline))
size_t
__fortify_strlcpy(char *__restrict dest, const char *__restrict src, size_t n)
{
size_t bos = __builtin_object_size(dest, 0);
if (__builtin_constant_p(n) && n > bos)
__strlcpy_error();
if (n > bos)
__builtin_trap();
return strlcpy(dest, src, n);
}
#endif
#undef memcpy
#define memcpy(dest, src, n) __fortify_memcpy(dest, src, n)
#undef memmove
#define memmove(dest, src, n) __fortify_memmove(dest, src, n)
#undef memset
#define memset(dest, src, n) __fortify_memset(dest, src, n)
#undef stpcpy
#define stpcpy(dest, src) __fortify_stpcpy(dest, src)
#undef stpncpy
#define stpncpy(dest, src, n) __fortify_stpncpy(dest, src, n)
#undef strcat
#define strcat(dest, src) __fortify_strcat(dest, src)
#undef strcpy
#define strcpy(dest, src) __fortify_strcpy(dest, src)
#undef strncat
#define strncat(dest, src, n) __fortify_strcat(dest, src, n)
#undef strncpy
#define strncpy(dest, src, n) __fortify_strcpy(dest, src, n)
#ifdef _GNU_SOURCE
#undef mempcpy
#define mempcpy(dest, src, n) __fortify_mempcpy(dest, src, n)
#endif
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#undef strlcat
#define strlcat(dest, src, n) __fortify_strlcat(dest, src, n)
#undef strlcpy
#define strlcpy(dest, src, n) __fortify_strlcpy(dest, src, n)
#endif
#endif
#endif
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