1 #ifndef _LINUX_STRING_H_ 2 #define _LINUX_STRING_H_ 3 4 5 #include <linux/compiler.h> /* for inline */ 6 #include <linux/types.h> /* for size_t */ 7 #include <linux/stddef.h> /* for NULL */ 8 #include <stdarg.h> 9 #include <uapi/linux/string.h> 10 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); 14 15 /* 16 * Include machine specific inline routines 17 */ 18 #include <asm/string.h> 19 20 #ifndef __HAVE_ARCH_STRCPY 21 extern char * strcpy(char *,const char *); 22 #endif 23 #ifndef __HAVE_ARCH_STRNCPY 24 extern char * strncpy(char *,const char *, __kernel_size_t); 25 #endif 26 #ifndef __HAVE_ARCH_STRLCPY 27 size_t strlcpy(char *, const char *, size_t); 28 #endif 29 #ifndef __HAVE_ARCH_STRSCPY 30 ssize_t __must_check strscpy(char *, const char *, size_t); 31 #endif 32 #ifndef __HAVE_ARCH_STRCAT 33 extern char * strcat(char *, const char *); 34 #endif 35 #ifndef __HAVE_ARCH_STRNCAT 36 extern char * strncat(char *, const char *, __kernel_size_t); 37 #endif 38 #ifndef __HAVE_ARCH_STRLCAT 39 extern size_t strlcat(char *, const char *, __kernel_size_t); 40 #endif 41 #ifndef __HAVE_ARCH_STRCMP 42 extern int strcmp(const char *,const char *); 43 #endif 44 #ifndef __HAVE_ARCH_STRNCMP 45 extern int strncmp(const char *,const char *,__kernel_size_t); 46 #endif 47 #ifndef __HAVE_ARCH_STRCASECMP 48 extern int strcasecmp(const char *s1, const char *s2); 49 #endif 50 #ifndef __HAVE_ARCH_STRNCASECMP 51 extern int strncasecmp(const char *s1, const char *s2, size_t n); 52 #endif 53 #ifndef __HAVE_ARCH_STRCHR 54 extern char * strchr(const char *,int); 55 #endif 56 #ifndef __HAVE_ARCH_STRCHRNUL 57 extern char * strchrnul(const char *,int); 58 #endif 59 #ifndef __HAVE_ARCH_STRNCHR 60 extern char * strnchr(const char *, size_t, int); 61 #endif 62 #ifndef __HAVE_ARCH_STRRCHR 63 extern char * strrchr(const char *,int); 64 #endif 65 extern char * __must_check skip_spaces(const char *); 66 67 extern char *strim(char *); 68 69 static inline __must_check char *strstrip(char *str) 70 { 71 return strim(str); 72 } 73 74 #ifndef __HAVE_ARCH_STRSTR 75 extern char * strstr(const char *, const char *); 76 #endif 77 #ifndef __HAVE_ARCH_STRNSTR 78 extern char * strnstr(const char *, const char *, size_t); 79 #endif 80 #ifndef __HAVE_ARCH_STRLEN 81 extern __kernel_size_t strlen(const char *); 82 #endif 83 #ifndef __HAVE_ARCH_STRNLEN 84 extern __kernel_size_t strnlen(const char *,__kernel_size_t); 85 #endif 86 #ifndef __HAVE_ARCH_STRPBRK 87 extern char * strpbrk(const char *,const char *); 88 #endif 89 #ifndef __HAVE_ARCH_STRSEP 90 extern char * strsep(char **,const char *); 91 #endif 92 #ifndef __HAVE_ARCH_STRSPN 93 extern __kernel_size_t strspn(const char *,const char *); 94 #endif 95 #ifndef __HAVE_ARCH_STRCSPN 96 extern __kernel_size_t strcspn(const char *,const char *); 97 #endif 98 99 #ifndef __HAVE_ARCH_MEMSET 100 extern void * memset(void *,int,__kernel_size_t); 101 #endif 102 103 #ifndef __HAVE_ARCH_MEMSET16 104 extern void *memset16(uint16_t *, uint16_t, __kernel_size_t); 105 #endif 106 107 #ifndef __HAVE_ARCH_MEMSET32 108 extern void *memset32(uint32_t *, uint32_t, __kernel_size_t); 109 #endif 110 111 #ifndef __HAVE_ARCH_MEMSET64 112 extern void *memset64(uint64_t *, uint64_t, __kernel_size_t); 113 #endif 114 115 static inline void *memset_l(unsigned long *p, unsigned long v, 116 __kernel_size_t n) 117 { 118 if (BITS_PER_LONG == 32) 119 return memset32((uint32_t *)p, v, n); 120 else 121 return memset64((uint64_t *)p, v, n); 122 } 123 124 static inline void *memset_p(void **p, void *v, __kernel_size_t n) 125 { 126 if (BITS_PER_LONG == 32) 127 return memset32((uint32_t *)p, (uintptr_t)v, n); 128 else 129 return memset64((uint64_t *)p, (uintptr_t)v, n); 130 } 131 132 #ifndef __HAVE_ARCH_MEMCPY 133 extern void * memcpy(void *,const void *,__kernel_size_t); 134 #endif 135 #ifndef __HAVE_ARCH_MEMMOVE 136 extern void * memmove(void *,const void *,__kernel_size_t); 137 #endif 138 #ifndef __HAVE_ARCH_MEMSCAN 139 extern void * memscan(void *,int,__kernel_size_t); 140 #endif 141 #ifndef __HAVE_ARCH_MEMCMP 142 extern int memcmp(const void *,const void *,__kernel_size_t); 143 #endif 144 #ifndef __HAVE_ARCH_MEMCHR 145 extern void * memchr(const void *,int,__kernel_size_t); 146 #endif 147 #ifndef __HAVE_ARCH_MEMCPY_MCSAFE 148 static inline __must_check int memcpy_mcsafe(void *dst, const void *src, 149 size_t cnt) 150 { 151 memcpy(dst, src, cnt); 152 return 0; 153 } 154 #endif 155 #ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE 156 static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt) 157 { 158 memcpy(dst, src, cnt); 159 } 160 #endif 161 void *memchr_inv(const void *s, int c, size_t n); 162 char *strreplace(char *s, char old, char new); 163 164 extern void kfree_const(const void *x); 165 166 extern char *kstrdup(const char *s, gfp_t gfp) __malloc; 167 extern const char *kstrdup_const(const char *s, gfp_t gfp); 168 extern char *kstrndup(const char *s, size_t len, gfp_t gfp); 169 extern void *kmemdup(const void *src, size_t len, gfp_t gfp); 170 extern char *kmemdup_nul(const char *s, size_t len, gfp_t gfp); 171 172 extern char **argv_split(gfp_t gfp, const char *str, int *argcp); 173 extern void argv_free(char **argv); 174 175 extern bool sysfs_streq(const char *s1, const char *s2); 176 extern int kstrtobool(const char *s, bool *res); 177 static inline int strtobool(const char *s, bool *res) 178 { 179 return kstrtobool(s, res); 180 } 181 182 int match_string(const char * const *array, size_t n, const char *string); 183 int __sysfs_match_string(const char * const *array, size_t n, const char *s); 184 185 /** 186 * sysfs_match_string - matches given string in an array 187 * @_a: array of strings 188 * @_s: string to match with 189 * 190 * Helper for __sysfs_match_string(). Calculates the size of @a automatically. 191 */ 192 #define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s) 193 194 #ifdef CONFIG_BINARY_PRINTF 195 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args); 196 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf); 197 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4); 198 #endif 199 200 extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, 201 const void *from, size_t available); 202 203 /** 204 * strstarts - does @str start with @prefix? 205 * @str: string to examine 206 * @prefix: prefix to look for. 207 */ 208 static inline bool strstarts(const char *str, const char *prefix) 209 { 210 return strncmp(str, prefix, strlen(prefix)) == 0; 211 } 212 213 size_t memweight(const void *ptr, size_t bytes); 214 void memzero_explicit(void *s, size_t count); 215 216 /** 217 * kbasename - return the last part of a pathname. 218 * 219 * @path: path to extract the filename from. 220 */ 221 static inline const char *kbasename(const char *path) 222 { 223 const char *tail = strrchr(path, '/'); 224 return tail ? tail + 1 : path; 225 } 226 227 #define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline)) 228 #define __RENAME(x) __asm__(#x) 229 230 void fortify_panic(const char *name) __noreturn __cold; 231 void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter"); 232 void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter"); 233 void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter"); 234 235 #if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE) 236 __FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size) 237 { 238 size_t p_size = __builtin_object_size(p, 0); 239 if (__builtin_constant_p(size) && p_size < size) 240 __write_overflow(); 241 if (p_size < size) 242 fortify_panic(__func__); 243 return __builtin_strncpy(p, q, size); 244 } 245 246 __FORTIFY_INLINE char *strcat(char *p, const char *q) 247 { 248 size_t p_size = __builtin_object_size(p, 0); 249 if (p_size == (size_t)-1) 250 return __builtin_strcat(p, q); 251 if (strlcat(p, q, p_size) >= p_size) 252 fortify_panic(__func__); 253 return p; 254 } 255 256 __FORTIFY_INLINE __kernel_size_t strlen(const char *p) 257 { 258 __kernel_size_t ret; 259 size_t p_size = __builtin_object_size(p, 0); 260 if (p_size == (size_t)-1) 261 return __builtin_strlen(p); 262 ret = strnlen(p, p_size); 263 if (p_size <= ret) 264 fortify_panic(__func__); 265 return ret; 266 } 267 268 extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen); 269 __FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen) 270 { 271 size_t p_size = __builtin_object_size(p, 0); 272 __kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size); 273 if (p_size <= ret && maxlen != ret) 274 fortify_panic(__func__); 275 return ret; 276 } 277 278 /* defined after fortified strlen to reuse it */ 279 extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy); 280 __FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size) 281 { 282 size_t ret; 283 size_t p_size = __builtin_object_size(p, 0); 284 size_t q_size = __builtin_object_size(q, 0); 285 if (p_size == (size_t)-1 && q_size == (size_t)-1) 286 return __real_strlcpy(p, q, size); 287 ret = strlen(q); 288 if (size) { 289 size_t len = (ret >= size) ? size - 1 : ret; 290 if (__builtin_constant_p(len) && len >= p_size) 291 __write_overflow(); 292 if (len >= p_size) 293 fortify_panic(__func__); 294 __builtin_memcpy(p, q, len); 295 p[len] = '\0'; 296 } 297 return ret; 298 } 299 300 /* defined after fortified strlen and strnlen to reuse them */ 301 __FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count) 302 { 303 size_t p_len, copy_len; 304 size_t p_size = __builtin_object_size(p, 0); 305 size_t q_size = __builtin_object_size(q, 0); 306 if (p_size == (size_t)-1 && q_size == (size_t)-1) 307 return __builtin_strncat(p, q, count); 308 p_len = strlen(p); 309 copy_len = strnlen(q, count); 310 if (p_size < p_len + copy_len + 1) 311 fortify_panic(__func__); 312 __builtin_memcpy(p + p_len, q, copy_len); 313 p[p_len + copy_len] = '\0'; 314 return p; 315 } 316 317 __FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size) 318 { 319 size_t p_size = __builtin_object_size(p, 0); 320 if (__builtin_constant_p(size) && p_size < size) 321 __write_overflow(); 322 if (p_size < size) 323 fortify_panic(__func__); 324 return __builtin_memset(p, c, size); 325 } 326 327 __FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size) 328 { 329 size_t p_size = __builtin_object_size(p, 0); 330 size_t q_size = __builtin_object_size(q, 0); 331 if (__builtin_constant_p(size)) { 332 if (p_size < size) 333 __write_overflow(); 334 if (q_size < size) 335 __read_overflow2(); 336 } 337 if (p_size < size || q_size < size) 338 fortify_panic(__func__); 339 return __builtin_memcpy(p, q, size); 340 } 341 342 __FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size) 343 { 344 size_t p_size = __builtin_object_size(p, 0); 345 size_t q_size = __builtin_object_size(q, 0); 346 if (__builtin_constant_p(size)) { 347 if (p_size < size) 348 __write_overflow(); 349 if (q_size < size) 350 __read_overflow2(); 351 } 352 if (p_size < size || q_size < size) 353 fortify_panic(__func__); 354 return __builtin_memmove(p, q, size); 355 } 356 357 extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan); 358 __FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size) 359 { 360 size_t p_size = __builtin_object_size(p, 0); 361 if (__builtin_constant_p(size) && p_size < size) 362 __read_overflow(); 363 if (p_size < size) 364 fortify_panic(__func__); 365 return __real_memscan(p, c, size); 366 } 367 368 __FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size) 369 { 370 size_t p_size = __builtin_object_size(p, 0); 371 size_t q_size = __builtin_object_size(q, 0); 372 if (__builtin_constant_p(size)) { 373 if (p_size < size) 374 __read_overflow(); 375 if (q_size < size) 376 __read_overflow2(); 377 } 378 if (p_size < size || q_size < size) 379 fortify_panic(__func__); 380 return __builtin_memcmp(p, q, size); 381 } 382 383 __FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size) 384 { 385 size_t p_size = __builtin_object_size(p, 0); 386 if (__builtin_constant_p(size) && p_size < size) 387 __read_overflow(); 388 if (p_size < size) 389 fortify_panic(__func__); 390 return __builtin_memchr(p, c, size); 391 } 392 393 void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv); 394 __FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size) 395 { 396 size_t p_size = __builtin_object_size(p, 0); 397 if (__builtin_constant_p(size) && p_size < size) 398 __read_overflow(); 399 if (p_size < size) 400 fortify_panic(__func__); 401 return __real_memchr_inv(p, c, size); 402 } 403 404 extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup); 405 __FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp) 406 { 407 size_t p_size = __builtin_object_size(p, 0); 408 if (__builtin_constant_p(size) && p_size < size) 409 __read_overflow(); 410 if (p_size < size) 411 fortify_panic(__func__); 412 return __real_kmemdup(p, size, gfp); 413 } 414 415 /* defined after fortified strlen and memcpy to reuse them */ 416 __FORTIFY_INLINE char *strcpy(char *p, const char *q) 417 { 418 size_t p_size = __builtin_object_size(p, 0); 419 size_t q_size = __builtin_object_size(q, 0); 420 if (p_size == (size_t)-1 && q_size == (size_t)-1) 421 return __builtin_strcpy(p, q); 422 memcpy(p, q, strlen(q) + 1); 423 return p; 424 } 425 426 #endif 427 428 #endif /* _LINUX_STRING_H_ */ 429