1 #ifndef _LINUX_STRING_H_
2 #define _LINUX_STRING_H_
5 #include <linux/compiler.h> /* for inline */
6 #include <linux/types.h> /* for size_t */
7 #include <linux/stddef.h> /* for NULL */
9 #include <uapi/linux/string.h>
11 extern char *strndup_user(const char __user
*, long);
12 extern void *memdup_user(const void __user
*, size_t);
13 extern void *memdup_user_nul(const void __user
*, size_t);
16 * Include machine specific inline routines
18 #include <asm/string.h>
20 #ifndef __HAVE_ARCH_STRCPY
21 extern char * strcpy(char *,const char *);
23 #ifndef __HAVE_ARCH_STRNCPY
24 extern char * strncpy(char *,const char *, __kernel_size_t
);
26 #ifndef __HAVE_ARCH_STRLCPY
27 size_t strlcpy(char *, const char *, size_t);
29 #ifndef __HAVE_ARCH_STRSCPY
30 ssize_t __must_check
strscpy(char *, const char *, size_t);
32 #ifndef __HAVE_ARCH_STRCAT
33 extern char * strcat(char *, const char *);
35 #ifndef __HAVE_ARCH_STRNCAT
36 extern char * strncat(char *, const char *, __kernel_size_t
);
38 #ifndef __HAVE_ARCH_STRLCAT
39 extern size_t strlcat(char *, const char *, __kernel_size_t
);
41 #ifndef __HAVE_ARCH_STRCMP
42 extern int strcmp(const char *,const char *);
44 #ifndef __HAVE_ARCH_STRNCMP
45 extern int strncmp(const char *,const char *,__kernel_size_t
);
47 #ifndef __HAVE_ARCH_STRCASECMP
48 extern int strcasecmp(const char *s1
, const char *s2
);
50 #ifndef __HAVE_ARCH_STRNCASECMP
51 extern int strncasecmp(const char *s1
, const char *s2
, size_t n
);
53 #ifndef __HAVE_ARCH_STRCHR
54 extern char * strchr(const char *,int);
56 #ifndef __HAVE_ARCH_STRCHRNUL
57 extern char * strchrnul(const char *,int);
59 #ifndef __HAVE_ARCH_STRNCHR
60 extern char * strnchr(const char *, size_t, int);
62 #ifndef __HAVE_ARCH_STRRCHR
63 extern char * strrchr(const char *,int);
65 extern char * __must_check
skip_spaces(const char *);
67 extern char *strim(char *);
69 static inline __must_check
char *strstrip(char *str
)
74 #ifndef __HAVE_ARCH_STRSTR
75 extern char * strstr(const char *, const char *);
77 #ifndef __HAVE_ARCH_STRNSTR
78 extern char * strnstr(const char *, const char *, size_t);
80 #ifndef __HAVE_ARCH_STRLEN
81 extern __kernel_size_t
strlen(const char *);
83 #ifndef __HAVE_ARCH_STRNLEN
84 extern __kernel_size_t
strnlen(const char *,__kernel_size_t
);
86 #ifndef __HAVE_ARCH_STRPBRK
87 extern char * strpbrk(const char *,const char *);
89 #ifndef __HAVE_ARCH_STRSEP
90 extern char * strsep(char **,const char *);
92 #ifndef __HAVE_ARCH_STRSPN
93 extern __kernel_size_t
strspn(const char *,const char *);
95 #ifndef __HAVE_ARCH_STRCSPN
96 extern __kernel_size_t
strcspn(const char *,const char *);
99 #ifndef __HAVE_ARCH_MEMSET
100 extern void * memset(void *,int,__kernel_size_t
);
102 #ifndef __HAVE_ARCH_MEMCPY
103 extern void * memcpy(void *,const void *,__kernel_size_t
);
105 #ifndef __HAVE_ARCH_MEMMOVE
106 extern void * memmove(void *,const void *,__kernel_size_t
);
108 #ifndef __HAVE_ARCH_MEMSCAN
109 extern void * memscan(void *,int,__kernel_size_t
);
111 #ifndef __HAVE_ARCH_MEMCMP
112 extern int memcmp(const void *,const void *,__kernel_size_t
);
114 #ifndef __HAVE_ARCH_MEMCHR
115 extern void * memchr(const void *,int,__kernel_size_t
);
117 #ifndef __HAVE_ARCH_MEMCPY_MCSAFE
118 static inline __must_check
int memcpy_mcsafe(void *dst
, const void *src
,
121 memcpy(dst
, src
, cnt
);
125 #ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE
126 static inline void memcpy_flushcache(void *dst
, const void *src
, size_t cnt
)
128 memcpy(dst
, src
, cnt
);
131 void *memchr_inv(const void *s
, int c
, size_t n
);
132 char *strreplace(char *s
, char old
, char new);
134 extern void kfree_const(const void *x
);
136 extern char *kstrdup(const char *s
, gfp_t gfp
) __malloc
;
137 extern const char *kstrdup_const(const char *s
, gfp_t gfp
);
138 extern char *kstrndup(const char *s
, size_t len
, gfp_t gfp
);
139 extern void *kmemdup(const void *src
, size_t len
, gfp_t gfp
);
140 extern char *kmemdup_nul(const char *s
, size_t len
, gfp_t gfp
);
142 extern char **argv_split(gfp_t gfp
, const char *str
, int *argcp
);
143 extern void argv_free(char **argv
);
145 extern bool sysfs_streq(const char *s1
, const char *s2
);
146 extern int kstrtobool(const char *s
, bool *res
);
147 static inline int strtobool(const char *s
, bool *res
)
149 return kstrtobool(s
, res
);
152 int match_string(const char * const *array
, size_t n
, const char *string
);
153 int __sysfs_match_string(const char * const *array
, size_t n
, const char *s
);
156 * sysfs_match_string - matches given string in an array
157 * @_a: array of strings
158 * @_s: string to match with
160 * Helper for __sysfs_match_string(). Calculates the size of @a automatically.
162 #define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
164 #ifdef CONFIG_BINARY_PRINTF
165 int vbin_printf(u32
*bin_buf
, size_t size
, const char *fmt
, va_list args
);
166 int bstr_printf(char *buf
, size_t size
, const char *fmt
, const u32
*bin_buf
);
167 int bprintf(u32
*bin_buf
, size_t size
, const char *fmt
, ...) __printf(3, 4);
170 extern ssize_t
memory_read_from_buffer(void *to
, size_t count
, loff_t
*ppos
,
171 const void *from
, size_t available
);
174 * strstarts - does @str start with @prefix?
175 * @str: string to examine
176 * @prefix: prefix to look for.
178 static inline bool strstarts(const char *str
, const char *prefix
)
180 return strncmp(str
, prefix
, strlen(prefix
)) == 0;
183 size_t memweight(const void *ptr
, size_t bytes
);
184 void memzero_explicit(void *s
, size_t count
);
187 * kbasename - return the last part of a pathname.
189 * @path: path to extract the filename from.
191 static inline const char *kbasename(const char *path
)
193 const char *tail
= strrchr(path
, '/');
194 return tail
? tail
+ 1 : path
;
197 #define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))
198 #define __RENAME(x) __asm__(#x)
200 void fortify_panic(const char *name
) __noreturn __cold
;
201 void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter");
202 void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter");
203 void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter");
205 #if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
206 __FORTIFY_INLINE
char *strncpy(char *p
, const char *q
, __kernel_size_t size
)
208 size_t p_size
= __builtin_object_size(p
, 0);
209 if (__builtin_constant_p(size
) && p_size
< size
)
212 fortify_panic(__func__
);
213 return __builtin_strncpy(p
, q
, size
);
216 __FORTIFY_INLINE
char *strcat(char *p
, const char *q
)
218 size_t p_size
= __builtin_object_size(p
, 0);
219 if (p_size
== (size_t)-1)
220 return __builtin_strcat(p
, q
);
221 if (strlcat(p
, q
, p_size
) >= p_size
)
222 fortify_panic(__func__
);
226 __FORTIFY_INLINE __kernel_size_t
strlen(const char *p
)
229 size_t p_size
= __builtin_object_size(p
, 0);
230 if (p_size
== (size_t)-1)
231 return __builtin_strlen(p
);
232 ret
= strnlen(p
, p_size
);
234 fortify_panic(__func__
);
238 extern __kernel_size_t
__real_strnlen(const char *, __kernel_size_t
) __RENAME(strnlen
);
239 __FORTIFY_INLINE __kernel_size_t
strnlen(const char *p
, __kernel_size_t maxlen
)
241 size_t p_size
= __builtin_object_size(p
, 0);
242 __kernel_size_t ret
= __real_strnlen(p
, maxlen
< p_size
? maxlen
: p_size
);
243 if (p_size
<= ret
&& maxlen
!= ret
)
244 fortify_panic(__func__
);
248 /* defined after fortified strlen to reuse it */
249 extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy
);
250 __FORTIFY_INLINE
size_t strlcpy(char *p
, const char *q
, size_t size
)
253 size_t p_size
= __builtin_object_size(p
, 0);
254 size_t q_size
= __builtin_object_size(q
, 0);
255 if (p_size
== (size_t)-1 && q_size
== (size_t)-1)
256 return __real_strlcpy(p
, q
, size
);
259 size_t len
= (ret
>= size
) ? size
- 1 : ret
;
260 if (__builtin_constant_p(len
) && len
>= p_size
)
263 fortify_panic(__func__
);
264 __builtin_memcpy(p
, q
, len
);
270 /* defined after fortified strlen and strnlen to reuse them */
271 __FORTIFY_INLINE
char *strncat(char *p
, const char *q
, __kernel_size_t count
)
273 size_t p_len
, copy_len
;
274 size_t p_size
= __builtin_object_size(p
, 0);
275 size_t q_size
= __builtin_object_size(q
, 0);
276 if (p_size
== (size_t)-1 && q_size
== (size_t)-1)
277 return __builtin_strncat(p
, q
, count
);
279 copy_len
= strnlen(q
, count
);
280 if (p_size
< p_len
+ copy_len
+ 1)
281 fortify_panic(__func__
);
282 __builtin_memcpy(p
+ p_len
, q
, copy_len
);
283 p
[p_len
+ copy_len
] = '\0';
287 __FORTIFY_INLINE
void *memset(void *p
, int c
, __kernel_size_t size
)
289 size_t p_size
= __builtin_object_size(p
, 0);
290 if (__builtin_constant_p(size
) && p_size
< size
)
293 fortify_panic(__func__
);
294 return __builtin_memset(p
, c
, size
);
297 __FORTIFY_INLINE
void *memcpy(void *p
, const void *q
, __kernel_size_t size
)
299 size_t p_size
= __builtin_object_size(p
, 0);
300 size_t q_size
= __builtin_object_size(q
, 0);
301 if (__builtin_constant_p(size
)) {
307 if (p_size
< size
|| q_size
< size
)
308 fortify_panic(__func__
);
309 return __builtin_memcpy(p
, q
, size
);
312 __FORTIFY_INLINE
void *memmove(void *p
, const void *q
, __kernel_size_t size
)
314 size_t p_size
= __builtin_object_size(p
, 0);
315 size_t q_size
= __builtin_object_size(q
, 0);
316 if (__builtin_constant_p(size
)) {
322 if (p_size
< size
|| q_size
< size
)
323 fortify_panic(__func__
);
324 return __builtin_memmove(p
, q
, size
);
327 extern void *__real_memscan(void *, int, __kernel_size_t
) __RENAME(memscan
);
328 __FORTIFY_INLINE
void *memscan(void *p
, int c
, __kernel_size_t size
)
330 size_t p_size
= __builtin_object_size(p
, 0);
331 if (__builtin_constant_p(size
) && p_size
< size
)
334 fortify_panic(__func__
);
335 return __real_memscan(p
, c
, size
);
338 __FORTIFY_INLINE
int memcmp(const void *p
, const void *q
, __kernel_size_t size
)
340 size_t p_size
= __builtin_object_size(p
, 0);
341 size_t q_size
= __builtin_object_size(q
, 0);
342 if (__builtin_constant_p(size
)) {
348 if (p_size
< size
|| q_size
< size
)
349 fortify_panic(__func__
);
350 return __builtin_memcmp(p
, q
, size
);
353 __FORTIFY_INLINE
void *memchr(const void *p
, int c
, __kernel_size_t size
)
355 size_t p_size
= __builtin_object_size(p
, 0);
356 if (__builtin_constant_p(size
) && p_size
< size
)
359 fortify_panic(__func__
);
360 return __builtin_memchr(p
, c
, size
);
363 void *__real_memchr_inv(const void *s
, int c
, size_t n
) __RENAME(memchr_inv
);
364 __FORTIFY_INLINE
void *memchr_inv(const void *p
, int c
, size_t size
)
366 size_t p_size
= __builtin_object_size(p
, 0);
367 if (__builtin_constant_p(size
) && p_size
< size
)
370 fortify_panic(__func__
);
371 return __real_memchr_inv(p
, c
, size
);
374 extern void *__real_kmemdup(const void *src
, size_t len
, gfp_t gfp
) __RENAME(kmemdup
);
375 __FORTIFY_INLINE
void *kmemdup(const void *p
, size_t size
, gfp_t gfp
)
377 size_t p_size
= __builtin_object_size(p
, 0);
378 if (__builtin_constant_p(size
) && p_size
< size
)
381 fortify_panic(__func__
);
382 return __real_kmemdup(p
, size
, gfp
);
385 /* defined after fortified strlen and memcpy to reuse them */
386 __FORTIFY_INLINE
char *strcpy(char *p
, const char *q
)
388 size_t p_size
= __builtin_object_size(p
, 0);
389 size_t q_size
= __builtin_object_size(q
, 0);
390 if (p_size
== (size_t)-1 && q_size
== (size_t)-1)
391 return __builtin_strcpy(p
, q
);
392 memcpy(p
, q
, strlen(q
) + 1);
398 #endif /* _LINUX_STRING_H_ */