1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/module.h> 3 #include <linux/kernel.h> 4 #include <linux/string.h> 5 #include <linux/slab.h> 6 #include <linux/parser.h> 7 #include <linux/errno.h> 8 #include <linux/stringhash.h> 9 10 #include "utf8n.h" 11 12 int utf8_validate(const struct unicode_map *um, const struct qstr *str) 13 { 14 if (utf8nlen(um, UTF8_NFDI, str->name, str->len) < 0) 15 return -1; 16 return 0; 17 } 18 EXPORT_SYMBOL(utf8_validate); 19 20 int utf8_strncmp(const struct unicode_map *um, 21 const struct qstr *s1, const struct qstr *s2) 22 { 23 struct utf8cursor cur1, cur2; 24 int c1, c2; 25 26 if (utf8ncursor(&cur1, um, UTF8_NFDI, s1->name, s1->len) < 0) 27 return -EINVAL; 28 29 if (utf8ncursor(&cur2, um, UTF8_NFDI, s2->name, s2->len) < 0) 30 return -EINVAL; 31 32 do { 33 c1 = utf8byte(&cur1); 34 c2 = utf8byte(&cur2); 35 36 if (c1 < 0 || c2 < 0) 37 return -EINVAL; 38 if (c1 != c2) 39 return 1; 40 } while (c1); 41 42 return 0; 43 } 44 EXPORT_SYMBOL(utf8_strncmp); 45 46 int utf8_strncasecmp(const struct unicode_map *um, 47 const struct qstr *s1, const struct qstr *s2) 48 { 49 struct utf8cursor cur1, cur2; 50 int c1, c2; 51 52 if (utf8ncursor(&cur1, um, UTF8_NFDICF, s1->name, s1->len) < 0) 53 return -EINVAL; 54 55 if (utf8ncursor(&cur2, um, UTF8_NFDICF, s2->name, s2->len) < 0) 56 return -EINVAL; 57 58 do { 59 c1 = utf8byte(&cur1); 60 c2 = utf8byte(&cur2); 61 62 if (c1 < 0 || c2 < 0) 63 return -EINVAL; 64 if (c1 != c2) 65 return 1; 66 } while (c1); 67 68 return 0; 69 } 70 EXPORT_SYMBOL(utf8_strncasecmp); 71 72 /* String cf is expected to be a valid UTF-8 casefolded 73 * string. 74 */ 75 int utf8_strncasecmp_folded(const struct unicode_map *um, 76 const struct qstr *cf, 77 const struct qstr *s1) 78 { 79 struct utf8cursor cur1; 80 int c1, c2; 81 int i = 0; 82 83 if (utf8ncursor(&cur1, um, UTF8_NFDICF, s1->name, s1->len) < 0) 84 return -EINVAL; 85 86 do { 87 c1 = utf8byte(&cur1); 88 c2 = cf->name[i++]; 89 if (c1 < 0) 90 return -EINVAL; 91 if (c1 != c2) 92 return 1; 93 } while (c1); 94 95 return 0; 96 } 97 EXPORT_SYMBOL(utf8_strncasecmp_folded); 98 99 int utf8_casefold(const struct unicode_map *um, const struct qstr *str, 100 unsigned char *dest, size_t dlen) 101 { 102 struct utf8cursor cur; 103 size_t nlen = 0; 104 105 if (utf8ncursor(&cur, um, UTF8_NFDICF, str->name, str->len) < 0) 106 return -EINVAL; 107 108 for (nlen = 0; nlen < dlen; nlen++) { 109 int c = utf8byte(&cur); 110 111 dest[nlen] = c; 112 if (!c) 113 return nlen; 114 if (c == -1) 115 break; 116 } 117 return -EINVAL; 118 } 119 EXPORT_SYMBOL(utf8_casefold); 120 121 int utf8_casefold_hash(const struct unicode_map *um, const void *salt, 122 struct qstr *str) 123 { 124 struct utf8cursor cur; 125 int c; 126 unsigned long hash = init_name_hash(salt); 127 128 if (utf8ncursor(&cur, um, UTF8_NFDICF, str->name, str->len) < 0) 129 return -EINVAL; 130 131 while ((c = utf8byte(&cur))) { 132 if (c < 0) 133 return -EINVAL; 134 hash = partial_name_hash((unsigned char)c, hash); 135 } 136 str->hash = end_name_hash(hash); 137 return 0; 138 } 139 EXPORT_SYMBOL(utf8_casefold_hash); 140 141 int utf8_normalize(const struct unicode_map *um, const struct qstr *str, 142 unsigned char *dest, size_t dlen) 143 { 144 struct utf8cursor cur; 145 ssize_t nlen = 0; 146 147 if (utf8ncursor(&cur, um, UTF8_NFDI, str->name, str->len) < 0) 148 return -EINVAL; 149 150 for (nlen = 0; nlen < dlen; nlen++) { 151 int c = utf8byte(&cur); 152 153 dest[nlen] = c; 154 if (!c) 155 return nlen; 156 if (c == -1) 157 break; 158 } 159 return -EINVAL; 160 } 161 EXPORT_SYMBOL(utf8_normalize); 162 163 static const struct utf8data *find_table_version(const struct utf8data *table, 164 size_t nr_entries, unsigned int version) 165 { 166 size_t i = nr_entries - 1; 167 168 while (version < table[i].maxage) 169 i--; 170 if (version > table[i].maxage) 171 return NULL; 172 return &table[i]; 173 } 174 175 struct unicode_map *utf8_load(unsigned int version) 176 { 177 struct unicode_map *um; 178 179 um = kzalloc(sizeof(struct unicode_map), GFP_KERNEL); 180 if (!um) 181 return ERR_PTR(-ENOMEM); 182 um->version = version; 183 184 um->tables = symbol_request(utf8_data_table); 185 if (!um->tables) 186 goto out_free_um; 187 188 if (!utf8version_is_supported(um, version)) 189 goto out_symbol_put; 190 um->ntab[UTF8_NFDI] = find_table_version(um->tables->utf8nfdidata, 191 um->tables->utf8nfdidata_size, um->version); 192 if (!um->ntab[UTF8_NFDI]) 193 goto out_symbol_put; 194 um->ntab[UTF8_NFDICF] = find_table_version(um->tables->utf8nfdicfdata, 195 um->tables->utf8nfdicfdata_size, um->version); 196 if (!um->ntab[UTF8_NFDICF]) 197 goto out_symbol_put; 198 return um; 199 200 out_symbol_put: 201 symbol_put(um->tables); 202 out_free_um: 203 kfree(um); 204 return ERR_PTR(-EINVAL); 205 } 206 EXPORT_SYMBOL(utf8_load); 207 208 void utf8_unload(struct unicode_map *um) 209 { 210 if (um) { 211 symbol_put(utf8_data_table); 212 kfree(um); 213 } 214 } 215 EXPORT_SYMBOL(utf8_unload); 216 217