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); 140 141 extern char **argv_split(gfp_t gfp, const char *str, int *argcp); 142 extern void argv_free(char **argv); 143 144 extern bool sysfs_streq(const char *s1, const char *s2); 145 extern int kstrtobool(const char *s, bool *res); 146 static inline int strtobool(const char *s, bool *res) 147 { 148 return kstrtobool(s, res); 149 } 150 151 int match_string(const char * const *array, size_t n, const char *string); 152 int __sysfs_match_string(const char * const *array, size_t n, const char *s); 153 154 /** 155 * sysfs_match_string - matches given string in an array 156 * @_a: array of strings 157 * @_s: string to match with 158 * 159 * Helper for __sysfs_match_string(). Calculates the size of @a automatically. 160 */ 161 #define sysfs_match_string(_a, _s) __sysfs_match_string(_a, ARRAY_SIZE(_a), _s) 162 163 #ifdef CONFIG_BINARY_PRINTF 164 int vbin_printf(u32 *bin_buf, size_t size, const char *fmt, va_list args); 165 int bstr_printf(char *buf, size_t size, const char *fmt, const u32 *bin_buf); 166 int bprintf(u32 *bin_buf, size_t size, const char *fmt, ...) __printf(3, 4); 167 #endif 168 169 extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos, 170 const void *from, size_t available); 171 172 /** 173 * strstarts - does @str start with @prefix? 174 * @str: string to examine 175 * @prefix: prefix to look for. 176 */ 177 static inline bool strstarts(const char *str, const char *prefix) 178 { 179 return strncmp(str, prefix, strlen(prefix)) == 0; 180 } 181 182 size_t memweight(const void *ptr, size_t bytes); 183 void memzero_explicit(void *s, size_t count); 184 185 /** 186 * kbasename - return the last part of a pathname. 187 * 188 * @path: path to extract the filename from. 189 */ 190 static inline const char *kbasename(const char *path) 191 { 192 const char *tail = strrchr(path, '/'); 193 return tail ? tail + 1 : path; 194 } 195 196 #define __FORTIFY_INLINE extern __always_inline __attribute__((gnu_inline)) 197 #define __RENAME(x) __asm__(#x) 198 199 void fortify_panic(const char *name) __noreturn __cold; 200 void __read_overflow(void) __compiletime_error("detected read beyond size of object passed as 1st parameter"); 201 void __read_overflow2(void) __compiletime_error("detected read beyond size of object passed as 2nd parameter"); 202 void __write_overflow(void) __compiletime_error("detected write beyond size of object passed as 1st parameter"); 203 204 #if !defined(__NO_FORTIFY) && defined(__OPTIMIZE__) && defined(CONFIG_FORTIFY_SOURCE) 205 __FORTIFY_INLINE char *strcpy(char *p, const char *q) 206 { 207 size_t p_size = __builtin_object_size(p, 0); 208 size_t q_size = __builtin_object_size(q, 0); 209 if (p_size == (size_t)-1 && q_size == (size_t)-1) 210 return __builtin_strcpy(p, q); 211 if (strscpy(p, q, p_size < q_size ? p_size : q_size) < 0) 212 fortify_panic(__func__); 213 return p; 214 } 215 216 __FORTIFY_INLINE char *strncpy(char *p, const char *q, __kernel_size_t size) 217 { 218 size_t p_size = __builtin_object_size(p, 0); 219 if (__builtin_constant_p(size) && p_size < size) 220 __write_overflow(); 221 if (p_size < size) 222 fortify_panic(__func__); 223 return __builtin_strncpy(p, q, size); 224 } 225 226 __FORTIFY_INLINE char *strcat(char *p, const char *q) 227 { 228 size_t p_size = __builtin_object_size(p, 0); 229 if (p_size == (size_t)-1) 230 return __builtin_strcat(p, q); 231 if (strlcat(p, q, p_size) >= p_size) 232 fortify_panic(__func__); 233 return p; 234 } 235 236 __FORTIFY_INLINE __kernel_size_t strlen(const char *p) 237 { 238 __kernel_size_t ret; 239 size_t p_size = __builtin_object_size(p, 0); 240 if (p_size == (size_t)-1) 241 return __builtin_strlen(p); 242 ret = strnlen(p, p_size); 243 if (p_size <= ret) 244 fortify_panic(__func__); 245 return ret; 246 } 247 248 extern __kernel_size_t __real_strnlen(const char *, __kernel_size_t) __RENAME(strnlen); 249 __FORTIFY_INLINE __kernel_size_t strnlen(const char *p, __kernel_size_t maxlen) 250 { 251 size_t p_size = __builtin_object_size(p, 0); 252 __kernel_size_t ret = __real_strnlen(p, maxlen < p_size ? maxlen : p_size); 253 if (p_size <= ret && maxlen != ret) 254 fortify_panic(__func__); 255 return ret; 256 } 257 258 /* defined after fortified strlen to reuse it */ 259 extern size_t __real_strlcpy(char *, const char *, size_t) __RENAME(strlcpy); 260 __FORTIFY_INLINE size_t strlcpy(char *p, const char *q, size_t size) 261 { 262 size_t ret; 263 size_t p_size = __builtin_object_size(p, 0); 264 size_t q_size = __builtin_object_size(q, 0); 265 if (p_size == (size_t)-1 && q_size == (size_t)-1) 266 return __real_strlcpy(p, q, size); 267 ret = strlen(q); 268 if (size) { 269 size_t len = (ret >= size) ? size - 1 : ret; 270 if (__builtin_constant_p(len) && len >= p_size) 271 __write_overflow(); 272 if (len >= p_size) 273 fortify_panic(__func__); 274 __builtin_memcpy(p, q, len); 275 p[len] = '\0'; 276 } 277 return ret; 278 } 279 280 /* defined after fortified strlen and strnlen to reuse them */ 281 __FORTIFY_INLINE char *strncat(char *p, const char *q, __kernel_size_t count) 282 { 283 size_t p_len, copy_len; 284 size_t p_size = __builtin_object_size(p, 0); 285 size_t q_size = __builtin_object_size(q, 0); 286 if (p_size == (size_t)-1 && q_size == (size_t)-1) 287 return __builtin_strncat(p, q, count); 288 p_len = strlen(p); 289 copy_len = strnlen(q, count); 290 if (p_size < p_len + copy_len + 1) 291 fortify_panic(__func__); 292 __builtin_memcpy(p + p_len, q, copy_len); 293 p[p_len + copy_len] = '\0'; 294 return p; 295 } 296 297 __FORTIFY_INLINE void *memset(void *p, int c, __kernel_size_t size) 298 { 299 size_t p_size = __builtin_object_size(p, 0); 300 if (__builtin_constant_p(size) && p_size < size) 301 __write_overflow(); 302 if (p_size < size) 303 fortify_panic(__func__); 304 return __builtin_memset(p, c, size); 305 } 306 307 __FORTIFY_INLINE void *memcpy(void *p, const void *q, __kernel_size_t size) 308 { 309 size_t p_size = __builtin_object_size(p, 0); 310 size_t q_size = __builtin_object_size(q, 0); 311 if (__builtin_constant_p(size)) { 312 if (p_size < size) 313 __write_overflow(); 314 if (q_size < size) 315 __read_overflow2(); 316 } 317 if (p_size < size || q_size < size) 318 fortify_panic(__func__); 319 return __builtin_memcpy(p, q, size); 320 } 321 322 __FORTIFY_INLINE void *memmove(void *p, const void *q, __kernel_size_t size) 323 { 324 size_t p_size = __builtin_object_size(p, 0); 325 size_t q_size = __builtin_object_size(q, 0); 326 if (__builtin_constant_p(size)) { 327 if (p_size < size) 328 __write_overflow(); 329 if (q_size < size) 330 __read_overflow2(); 331 } 332 if (p_size < size || q_size < size) 333 fortify_panic(__func__); 334 return __builtin_memmove(p, q, size); 335 } 336 337 extern void *__real_memscan(void *, int, __kernel_size_t) __RENAME(memscan); 338 __FORTIFY_INLINE void *memscan(void *p, int c, __kernel_size_t size) 339 { 340 size_t p_size = __builtin_object_size(p, 0); 341 if (__builtin_constant_p(size) && p_size < size) 342 __read_overflow(); 343 if (p_size < size) 344 fortify_panic(__func__); 345 return __real_memscan(p, c, size); 346 } 347 348 __FORTIFY_INLINE int memcmp(const void *p, const void *q, __kernel_size_t size) 349 { 350 size_t p_size = __builtin_object_size(p, 0); 351 size_t q_size = __builtin_object_size(q, 0); 352 if (__builtin_constant_p(size)) { 353 if (p_size < size) 354 __read_overflow(); 355 if (q_size < size) 356 __read_overflow2(); 357 } 358 if (p_size < size || q_size < size) 359 fortify_panic(__func__); 360 return __builtin_memcmp(p, q, size); 361 } 362 363 __FORTIFY_INLINE void *memchr(const void *p, int c, __kernel_size_t size) 364 { 365 size_t p_size = __builtin_object_size(p, 0); 366 if (__builtin_constant_p(size) && p_size < size) 367 __read_overflow(); 368 if (p_size < size) 369 fortify_panic(__func__); 370 return __builtin_memchr(p, c, size); 371 } 372 373 void *__real_memchr_inv(const void *s, int c, size_t n) __RENAME(memchr_inv); 374 __FORTIFY_INLINE void *memchr_inv(const void *p, int c, size_t size) 375 { 376 size_t p_size = __builtin_object_size(p, 0); 377 if (__builtin_constant_p(size) && p_size < size) 378 __read_overflow(); 379 if (p_size < size) 380 fortify_panic(__func__); 381 return __real_memchr_inv(p, c, size); 382 } 383 384 extern void *__real_kmemdup(const void *src, size_t len, gfp_t gfp) __RENAME(kmemdup); 385 __FORTIFY_INLINE void *kmemdup(const void *p, size_t size, gfp_t gfp) 386 { 387 size_t p_size = __builtin_object_size(p, 0); 388 if (__builtin_constant_p(size) && p_size < size) 389 __read_overflow(); 390 if (p_size < size) 391 fortify_panic(__func__); 392 return __real_kmemdup(p, size, gfp); 393 } 394 #endif 395 396 #endif /* _LINUX_STRING_H_ */ 397