1
2#ifndef _LINUX_STRING_H_
3#define _LINUX_STRING_H_
4
5
6#include <linux/compiler.h>
7#include <linux/types.h>
8#include <linux/stddef.h>
9#include <stdarg.h>
10#include <uapi/linux/string.h>
11
12extern char *strndup_user(const char __user *, long);
13extern void *memdup_user(const void __user *, size_t);
14extern void *vmemdup_user(const void __user *, size_t);
15extern void *memdup_user_nul(const void __user *, size_t);
16
17
18
19
20#include <asm/string.h>
21
22#ifndef __HAVE_ARCH_STRCPY
23extern char * strcpy(char *,const char *);
24#endif
25#ifndef __HAVE_ARCH_STRNCPY
26extern char * strncpy(char *,const char *, __kernel_size_t);
27#endif
28#ifndef __HAVE_ARCH_STRLCPY
29size_t strlcpy(char *, const char *, size_t);
30#endif
31#ifndef __HAVE_ARCH_STRSCPY
32ssize_t strscpy(char *, const char *, size_t);
33#endif
34
35
36ssize_t strscpy_pad(char *dest, const char *src, size_t count);
37
38#ifndef __HAVE_ARCH_STRCAT
39extern char * strcat(char *, const char *);
40#endif
41#ifndef __HAVE_ARCH_STRNCAT
42extern char * strncat(char *, const char *, __kernel_size_t);
43#endif
44#ifndef __HAVE_ARCH_STRLCAT
45extern size_t strlcat(char *, const char *, __kernel_size_t);
46#endif
47#ifndef __HAVE_ARCH_STRCMP
48extern int strcmp(const char *,const char *);
49#endif
50#ifndef __HAVE_ARCH_STRNCMP
51extern int strncmp(const char *,const char *,__kernel_size_t);
52#endif
53#ifndef __HAVE_ARCH_STRCASECMP
54extern int strcasecmp(const char *s1, const char *s2);
55#endif
56#ifndef __HAVE_ARCH_STRNCASECMP
57extern int strncasecmp(const char *s1, const char *s2, size_t n);
58#endif
59#ifndef __HAVE_ARCH_STRCHR
60extern char * strchr(const char *,int);
61#endif
62#ifndef __HAVE_ARCH_STRCHRNUL
63extern char * strchrnul(const char *,int);
64#endif
65#ifndef __HAVE_ARCH_STRNCHR
66extern char * strnchr(const char *, size_t, int);
67#endif
68#ifndef __HAVE_ARCH_STRRCHR
69extern char * strrchr(const char *,int);
70#endif
71extern char * __must_check skip_spaces(const char *);
72
73extern char *strim(char *);
74
75static inline __must_check char *strstrip(char *str)
76{
77 return strim(str);
78}
79
80#ifndef __HAVE_ARCH_STRSTR
81extern char * strstr(const char *, const char *);
82#endif
83#ifndef __HAVE_ARCH_STRNSTR
84extern char * strnstr(const char *, const char *, size_t);
85#endif
86#ifndef __HAVE_ARCH_STRLEN
87extern __kernel_size_t strlen(const char *);
88#endif
89#ifndef __HAVE_ARCH_STRNLEN
90extern __kernel_size_t strnlen(const char *,__kernel_size_t);
91#endif
92#ifndef __HAVE_ARCH_STRPBRK
93extern char * strpbrk(const char *,const char *);
94#endif
95#ifndef __HAVE_ARCH_STRSEP
96extern char * strsep(char **,const char *);
97#endif
98#ifndef __HAVE_ARCH_STRSPN
99extern __kernel_size_t strspn(const char *,const char *);
100#endif
101#ifndef __HAVE_ARCH_STRCSPN
102extern __kernel_size_t strcspn(const char *,const char *);
103#endif
104
105#ifndef __HAVE_ARCH_MEMSET
106extern void * memset(void *,int,__kernel_size_t);
107#endif
108
109#ifndef __HAVE_ARCH_MEMSET16
110extern void *memset16(uint16_t *, uint16_t, __kernel_size_t);
111#endif
112
113#ifndef __HAVE_ARCH_MEMSET32
114extern void *memset32(uint32_t *, uint32_t, __kernel_size_t);
115#endif
116
117#ifndef __HAVE_ARCH_MEMSET64
118extern void *memset64(uint64_t *, uint64_t, __kernel_size_t);
119#endif
120
121static inline void *memset_l(unsigned long *p, unsigned long v,
122 __kernel_size_t n)
123{
124 if (BITS_PER_LONG == 32)
125 return memset32((uint32_t *)p, v, n);
126 else
127 return memset64((uint64_t *)p, v, n);
128}
129
130static inline void *memset_p(void **p, void *v, __kernel_size_t n)
131{
132 if (BITS_PER_LONG == 32)
133 return memset32((uint32_t *)p, (uintptr_t)v, n);
134 else
135 return memset64((uint64_t *)p, (uintptr_t)v, n);
136}
137
138extern void **__memcat_p(void **a, void **b);
139#define memcat_p(a, b) ({ \
140 BUILD_BUG_ON_MSG(!__same_type(*(a), *(b)), \
141 "type mismatch in memcat_p()"); \
142 (typeof(*a) *)__memcat_p((void **)(a), (void **)(b)); \
143})
144
145#ifndef __HAVE_ARCH_MEMCPY
146extern void * memcpy(void *,const void *,__kernel_size_t);
147#endif
148#ifndef __HAVE_ARCH_MEMMOVE
149extern void * memmove(void *,const void *,__kernel_size_t);
150#endif
151#ifndef __HAVE_ARCH_MEMSCAN
152extern void * memscan(void *,int,__kernel_size_t);
153#endif
154#ifndef __HAVE_ARCH_MEMCMP
155extern int memcmp(const void *,const void *,__kernel_size_t);
156#endif
157#ifndef __HAVE_ARCH_BCMP
158extern int bcmp(const void *,const void *,__kernel_size_t);
159#endif
160#ifndef __HAVE_ARCH_MEMCHR
161extern void * memchr(const void *,int,__kernel_size_t);
162#endif
163#ifndef __HAVE_ARCH_MEMCPY_MCSAFE
164static inline __must_check unsigned long memcpy_mcsafe(void *dst,
165 const void *src, size_t cnt)
166{
167 memcpy(dst, src, cnt);
168 return 0;
169}
170#endif
171#ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE
172static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt)
173{
174 memcpy(dst, src, cnt);
175}
176#endif
177void *memchr_inv(const void *s, int c, size_t n);
178char *strreplace(char *s, char old, char new);
179
180extern void kfree_const(const void *x);
181
182extern char *kstrdup(const char *s, gfp_t gfp) __malloc;
183extern const char *kstrdup_const(const char *s, gfp_t gfp);
184extern char *kstrndup(const char *s, size_t len, gfp_t gfp);
185extern void *kmemdup(const void *src, size_t len, gfp_t gfp);
186extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp);
187
188extern char **argv_split(gfp_t gfp, const char *str, int *argcp);
189extern void argv_free(char **argv);
190
191extern bool sysfs_streq(const char *s1, const char *s2);
192extern int kstrtobool(const char *s, bool *res);
193static inline int strtobool(const char *s, bool *res)
194{
195 return kstrtobool(s, res);
196}
197
198int match_string(const char * const *array, size_t n, const char *string);
199int __sysfs_match_string(const char * const *array, size_t n, const char *s);
200
201
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206
207
208#define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s)
209
210#ifdef CONFIG_BINARY_PRINTF
211int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args);
212int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf);
213int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4);
214#endif
215
216extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
217 const void *from, size_t available);
218
219
220
221
222
223
224static inline bool strstarts(const char *str, const char *prefix)
225{
226 return strncmp(str, prefix, strlen(prefix)) == 0;
227}
228
229size_t memweight(const void *ptr, size_t bytes);
230
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243
244
245static inline void memzero_explicit(void *s, size_t count)
246{
247 memset(s, 0, count);
248 barrier_data(s);
249}
250
251
252
253
254
255
256static inline const char *kbasename(const char *path)
257{
258 const char *tail = strrchr(path, '/');
259 return tail ? tail + 1 : path;
260}
261
262#define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline))
263#define __RENAME(x) __asm__(#x)
264
265void fortify_panic(const char *name) __noreturn __cold;
266void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter");
267void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter");
268void __read_overflow3(void) __compiletime_error("detected read beyond size of object passed as 3rd parameter");
269void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter");
270
271#if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE)
272__FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size)
273{
274 size_t p_size = __builtin_object_size(p, 0);
275 if (__builtin_constant_p(size) && p_size < size)
276 __write_overflow();
277 if (p_size < size)
278 fortify_panic(__func__);
279 return __builtin_strncpy(p, q, size);
280}
281
282__FORTIFY_INLINE char *strcat(char *p, const char *q)
283{
284 size_t p_size = __builtin_object_size(p, 0);
285 if (p_size == (size_t)-1)
286 return __builtin_strcat(p, q);
287 if (strlcat(p, q, p_size) >= p_size)
288 fortify_panic(__func__);
289 return p;
290}
291
292__FORTIFY_INLINE __kernel_size_t strlen(const char *p)
293{
294 __kernel_size_t ret;
295 size_t p_size = __builtin_object_size(p, 0);
296
297
298 if (p_size == (size_t)-1 ||
299 (__builtin_constant_p(p[p_size - 1]) && p[p_size - 1] == '\0'))
300 return __builtin_strlen(p);
301 ret = strnlen(p, p_size);
302 if (p_size <= ret)
303 fortify_panic(__func__);
304 return ret;
305}
306
307extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen);
308__FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen)
309{
310 size_t p_size = __builtin_object_size(p, 0);
311 __kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size);
312 if (p_size <= ret && maxlen != ret)
313 fortify_panic(__func__);
314 return ret;
315}
316
317
318extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy);
319__FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size)
320{
321 size_t ret;
322 size_t p_size = __builtin_object_size(p, 0);
323 size_t q_size = __builtin_object_size(q, 0);
324 if (p_size == (size_t)-1 && q_size == (size_t)-1)
325 return __real_strlcpy(p, q, size);
326 ret = strlen(q);
327 if (size) {
328 size_t len = (ret >= size) ? size - 1 : ret;
329 if (__builtin_constant_p(len) && len >= p_size)
330 __write_overflow();
331 if (len >= p_size)
332 fortify_panic(__func__);
333 __builtin_memcpy(p, q, len);
334 p[len] = '\0';
335 }
336 return ret;
337}
338
339
340__FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count)
341{
342 size_t p_len, copy_len;
343 size_t p_size = __builtin_object_size(p, 0);
344 size_t q_size = __builtin_object_size(q, 0);
345 if (p_size == (size_t)-1 && q_size == (size_t)-1)
346 return __builtin_strncat(p, q, count);
347 p_len = strlen(p);
348 copy_len = strnlen(q, count);
349 if (p_size < p_len + copy_len + 1)
350 fortify_panic(__func__);
351 __builtin_memcpy(p + p_len, q, copy_len);
352 p[p_len + copy_len] = '\0';
353 return p;
354}
355
356__FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size)
357{
358 size_t p_size = __builtin_object_size(p, 0);
359 if (__builtin_constant_p(size) && p_size < size)
360 __write_overflow();
361 if (p_size < size)
362 fortify_panic(__func__);
363 return __builtin_memset(p, c, size);
364}
365
366__FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size)
367{
368 size_t p_size = __builtin_object_size(p, 0);
369 size_t q_size = __builtin_object_size(q, 0);
370 if (__builtin_constant_p(size)) {
371 if (p_size < size)
372 __write_overflow();
373 if (q_size < size)
374 __read_overflow2();
375 }
376 if (p_size < size || q_size < size)
377 fortify_panic(__func__);
378 return __builtin_memcpy(p, q, size);
379}
380
381__FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size)
382{
383 size_t p_size = __builtin_object_size(p, 0);
384 size_t q_size = __builtin_object_size(q, 0);
385 if (__builtin_constant_p(size)) {
386 if (p_size < size)
387 __write_overflow();
388 if (q_size < size)
389 __read_overflow2();
390 }
391 if (p_size < size || q_size < size)
392 fortify_panic(__func__);
393 return __builtin_memmove(p, q, size);
394}
395
396extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan);
397__FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size)
398{
399 size_t p_size = __builtin_object_size(p, 0);
400 if (__builtin_constant_p(size) && p_size < size)
401 __read_overflow();
402 if (p_size < size)
403 fortify_panic(__func__);
404 return __real_memscan(p, c, size);
405}
406
407__FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size)
408{
409 size_t p_size = __builtin_object_size(p, 0);
410 size_t q_size = __builtin_object_size(q, 0);
411 if (__builtin_constant_p(size)) {
412 if (p_size < size)
413 __read_overflow();
414 if (q_size < size)
415 __read_overflow2();
416 }
417 if (p_size < size || q_size < size)
418 fortify_panic(__func__);
419 return __builtin_memcmp(p, q, size);
420}
421
422__FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size)
423{
424 size_t p_size = __builtin_object_size(p, 0);
425 if (__builtin_constant_p(size) && p_size < size)
426 __read_overflow();
427 if (p_size < size)
428 fortify_panic(__func__);
429 return __builtin_memchr(p, c, size);
430}
431
432void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv);
433__FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size)
434{
435 size_t p_size = __builtin_object_size(p, 0);
436 if (__builtin_constant_p(size) && p_size < size)
437 __read_overflow();
438 if (p_size < size)
439 fortify_panic(__func__);
440 return __real_memchr_inv(p, c, size);
441}
442
443extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup);
444__FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp)
445{
446 size_t p_size = __builtin_object_size(p, 0);
447 if (__builtin_constant_p(size) && p_size < size)
448 __read_overflow();
449 if (p_size < size)
450 fortify_panic(__func__);
451 return __real_kmemdup(p, size, gfp);
452}
453
454
455__FORTIFY_INLINE char *strcpy(char *p, const char *q)
456{
457 size_t p_size = __builtin_object_size(p, 0);
458 size_t q_size = __builtin_object_size(q, 0);
459 if (p_size == (size_t)-1 && q_size == (size_t)-1)
460 return __builtin_strcpy(p, q);
461 memcpy(p, q, strlen(q) + 1);
462 return p;
463}
464
465#endif
466
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473
474
475static inline void memcpy_and_pad(void *dest, size_t dest_len,
476 const void *src, size_t count, int pad)
477{
478 if (dest_len > count) {
479 memcpy(dest, src, count);
480 memset(dest + count, pad, dest_len - count);
481 } else
482 memcpy(dest, src, dest_len);
483}
484
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499
500static __always_inline size_t str_has_prefix(const char *str, const char *prefix)
501{
502 size_t len = strlen(prefix);
503 return strncmp(str, prefix, len) == 0 ? len : 0;
504}
505
506#endif
507