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
utf8_validate(const struct unicode_map * um,const struct qstr * str)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
utf8_strncmp(const struct unicode_map * um,const struct qstr * s1,const struct qstr * s2)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
utf8_strncasecmp(const struct unicode_map * um,const struct qstr * s1,const struct qstr * s2)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 */
utf8_strncasecmp_folded(const struct unicode_map * um,const struct qstr * cf,const struct qstr * s1)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
utf8_casefold(const struct unicode_map * um,const struct qstr * str,unsigned char * dest,size_t dlen)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
utf8_casefold_hash(const struct unicode_map * um,const void * salt,struct qstr * str)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
utf8_normalize(const struct unicode_map * um,const struct qstr * str,unsigned char * dest,size_t dlen)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
find_table_version(const struct utf8data * table,size_t nr_entries,unsigned int version)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
utf8_load(unsigned int version)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
utf8_unload(struct unicode_map * um)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 MODULE_LICENSE("GPL v2");
218