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 #ifndef __HAVE_ARCH_MEMCPY 103 extern void * memcpy(void *,const void *,__kernel_size_t); 104 #endif 105 #ifndef __HAVE_ARCH_MEMMOVE 106 extern void * memmove(void *,const void *,__kernel_size_t); 107 #endif 108 #ifndef __HAVE_ARCH_MEMSCAN 109 extern void * memscan(void *,int,__kernel_size_t); 110 #endif 111 #ifndef __HAVE_ARCH_MEMCMP 112 extern int memcmp(const void *,const void *,__kernel_size_t); 113 #endif 114 #ifndef __HAVE_ARCH_MEMCHR 115 extern void * memchr(const void *,int,__kernel_size_t); 116 #endif 117 #ifndef __HAVE_ARCH_MEMCPY_MCSAFE 118 static inline __must_check int memcpy_mcsafe(void *dst, const void *src, 119 size_t cnt) 120 { 121 memcpy(dst, src, cnt); 122 return 0; 123 } 124 #endif 125 #ifndef __HAVE_ARCH_MEMCPY_FLUSHCACHE 126 static inline void memcpy_flushcache(void *dst, const void *src, size_t cnt) 127 { 128 memcpy(dst, src, cnt); 129 } 130 #endif 131 void *memchr_inv(const void *s, int c, size_t n); 132 char *strreplace(char *s, char old, char new); 133 134 extern void kfree_const(const void *x); 135 136 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); 141 142 extern char **argv_split(gfp_t gfp, const char *str, int *argcp); 143 extern void argv_free(char **argv); 144 145 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) 148 { 149 return kstrtobool(s, res); 150 } 151 152 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); 154 155 /** 156 * sysfs_match_string - matches given string in an array 157 * @_a: array of strings 158 * @_s: string to match with 159 * 160 * Helper for __sysfs_match_string(). Calculates the size of @a automatically. 161 */ 162 #define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s) 163 164 #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); 168 #endif 169 170 extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, 171 const void *from, size_t available); 172 173 /** 174 * strstarts - does @str start with @prefix? 175 * @str: string to examine 176 * @prefix: prefix to look for. 177 */ 178 static inline bool strstarts(const char *str, const char *prefix) 179 { 180 return strncmp(str, prefix, strlen(prefix)) == 0; 181 } 182 183 size_t memweight(const void *ptr, size_t bytes); 184 void memzero_explicit(void *s, size_t count); 185 186 /** 187 * kbasename - return the last part of a pathname. 188 * 189 * @path: path to extract the filename from. 190 */ 191 static inline const char *kbasename(const char *path) 192 { 193 const char *tail = strrchr(path, '/'); 194 return tail ? tail + 1 : path; 195 } 196 197 #define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline)) 198 #define __RENAME(x) __asm__(#x) 199 200 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"); 204 205 #if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE) 206 __FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size) 207 { 208 size_t p_size = __builtin_object_size(p, 0); 209 if (__builtin_constant_p(size) && p_size < size) 210 __write_overflow(); 211 if (p_size < size) 212 fortify_panic(__func__); 213 return __builtin_strncpy(p, q, size); 214 } 215 216 __FORTIFY_INLINE char *strcat(char *p, const char *q) 217 { 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__); 223 return p; 224 } 225 226 __FORTIFY_INLINE __kernel_size_t strlen(const char *p) 227 { 228 __kernel_size_t ret; 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); 233 if (p_size <= ret) 234 fortify_panic(__func__); 235 return ret; 236 } 237 238 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) 240 { 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__); 245 return ret; 246 } 247 248 /* 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) 251 { 252 size_t ret; 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); 257 ret = strlen(q); 258 if (size) { 259 size_t len = (ret >= size) ? size - 1 : ret; 260 if (__builtin_constant_p(len) && len >= p_size) 261 __write_overflow(); 262 if (len >= p_size) 263 fortify_panic(__func__); 264 __builtin_memcpy(p, q, len); 265 p[len] = '\0'; 266 } 267 return ret; 268 } 269 270 /* defined after fortified strlen and strnlen to reuse them */ 271 __FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count) 272 { 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); 278 p_len = strlen(p); 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'; 284 return p; 285 } 286 287 __FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size) 288 { 289 size_t p_size = __builtin_object_size(p, 0); 290 if (__builtin_constant_p(size) && p_size < size) 291 __write_overflow(); 292 if (p_size < size) 293 fortify_panic(__func__); 294 return __builtin_memset(p, c, size); 295 } 296 297 __FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size) 298 { 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)) { 302 if (p_size < size) 303 __write_overflow(); 304 if (q_size < size) 305 __read_overflow2(); 306 } 307 if (p_size < size || q_size < size) 308 fortify_panic(__func__); 309 return __builtin_memcpy(p, q, size); 310 } 311 312 __FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size) 313 { 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)) { 317 if (p_size < size) 318 __write_overflow(); 319 if (q_size < size) 320 __read_overflow2(); 321 } 322 if (p_size < size || q_size < size) 323 fortify_panic(__func__); 324 return __builtin_memmove(p, q, size); 325 } 326 327 extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan); 328 __FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size) 329 { 330 size_t p_size = __builtin_object_size(p, 0); 331 if (__builtin_constant_p(size) && p_size < size) 332 __read_overflow(); 333 if (p_size < size) 334 fortify_panic(__func__); 335 return __real_memscan(p, c, size); 336 } 337 338 __FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size) 339 { 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)) { 343 if (p_size < size) 344 __read_overflow(); 345 if (q_size < size) 346 __read_overflow2(); 347 } 348 if (p_size < size || q_size < size) 349 fortify_panic(__func__); 350 return __builtin_memcmp(p, q, size); 351 } 352 353 __FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size) 354 { 355 size_t p_size = __builtin_object_size(p, 0); 356 if (__builtin_constant_p(size) && p_size < size) 357 __read_overflow(); 358 if (p_size < size) 359 fortify_panic(__func__); 360 return __builtin_memchr(p, c, size); 361 } 362 363 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) 365 { 366 size_t p_size = __builtin_object_size(p, 0); 367 if (__builtin_constant_p(size) && p_size < size) 368 __read_overflow(); 369 if (p_size < size) 370 fortify_panic(__func__); 371 return __real_memchr_inv(p, c, size); 372 } 373 374 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) 376 { 377 size_t p_size = __builtin_object_size(p, 0); 378 if (__builtin_constant_p(size) && p_size < size) 379 __read_overflow(); 380 if (p_size < size) 381 fortify_panic(__func__); 382 return __real_kmemdup(p, size, gfp); 383 } 384 385 /* defined after fortified strlen and memcpy to reuse them */ 386 __FORTIFY_INLINE char *strcpy(char *p, const char *q) 387 { 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); 393 return p; 394 } 395 396 #endif 397 398 #endif /* _LINUX_STRING_H_ */ 399