Commit | Line | Data |
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652ecc20 KK |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
aa98d7cf | 3 | * |
c00c310e | 4 | * Copyright © 2006 NEC Corporation |
aa98d7cf | 5 | * |
652ecc20 KK |
6 | * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
10 | */ | |
c00c310e | 11 | |
5a528957 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
aa98d7cf KK |
14 | #include <linux/kernel.h> |
15 | #include <linux/slab.h> | |
16 | #include <linux/fs.h> | |
914e2637 | 17 | #include <linux/sched.h> |
aa98d7cf KK |
18 | #include <linux/time.h> |
19 | #include <linux/crc32.h> | |
20 | #include <linux/jffs2.h> | |
21 | #include <linux/xattr.h> | |
22 | #include <linux/posix_acl_xattr.h> | |
23 | #include <linux/mtd/mtd.h> | |
24 | #include "nodelist.h" | |
25 | ||
26 | static size_t jffs2_acl_size(int count) | |
27 | { | |
28 | if (count <= 4) { | |
de1f72fa KK |
29 | return sizeof(struct jffs2_acl_header) |
30 | + count * sizeof(struct jffs2_acl_entry_short); | |
aa98d7cf | 31 | } else { |
de1f72fa KK |
32 | return sizeof(struct jffs2_acl_header) |
33 | + 4 * sizeof(struct jffs2_acl_entry_short) | |
34 | + (count - 4) * sizeof(struct jffs2_acl_entry); | |
aa98d7cf KK |
35 | } |
36 | } | |
37 | ||
38 | static int jffs2_acl_count(size_t size) | |
39 | { | |
40 | size_t s; | |
41 | ||
de1f72fa | 42 | size -= sizeof(struct jffs2_acl_header); |
fc371a25 | 43 | if (size < 4 * sizeof(struct jffs2_acl_entry_short)) { |
de1f72fa | 44 | if (size % sizeof(struct jffs2_acl_entry_short)) |
aa98d7cf | 45 | return -1; |
de1f72fa | 46 | return size / sizeof(struct jffs2_acl_entry_short); |
aa98d7cf | 47 | } else { |
fc371a25 | 48 | s = size - 4 * sizeof(struct jffs2_acl_entry_short); |
de1f72fa | 49 | if (s % sizeof(struct jffs2_acl_entry)) |
aa98d7cf | 50 | return -1; |
de1f72fa | 51 | return s / sizeof(struct jffs2_acl_entry) + 4; |
aa98d7cf KK |
52 | } |
53 | } | |
54 | ||
dea80134 | 55 | static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size) |
aa98d7cf | 56 | { |
dea80134 KK |
57 | void *end = value + size; |
58 | struct jffs2_acl_header *header = value; | |
59 | struct jffs2_acl_entry *entry; | |
aa98d7cf KK |
60 | struct posix_acl *acl; |
61 | uint32_t ver; | |
62 | int i, count; | |
63 | ||
64 | if (!value) | |
65 | return NULL; | |
de1f72fa | 66 | if (size < sizeof(struct jffs2_acl_header)) |
aa98d7cf | 67 | return ERR_PTR(-EINVAL); |
dea80134 | 68 | ver = je32_to_cpu(header->a_version); |
aa98d7cf KK |
69 | if (ver != JFFS2_ACL_VERSION) { |
70 | JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver); | |
71 | return ERR_PTR(-EINVAL); | |
72 | } | |
73 | ||
dea80134 | 74 | value += sizeof(struct jffs2_acl_header); |
aa98d7cf KK |
75 | count = jffs2_acl_count(size); |
76 | if (count < 0) | |
77 | return ERR_PTR(-EINVAL); | |
78 | if (count == 0) | |
79 | return NULL; | |
80 | ||
81 | acl = posix_acl_alloc(count, GFP_KERNEL); | |
82 | if (!acl) | |
83 | return ERR_PTR(-ENOMEM); | |
84 | ||
85 | for (i=0; i < count; i++) { | |
dea80134 KK |
86 | entry = value; |
87 | if (value + sizeof(struct jffs2_acl_entry_short) > end) | |
aa98d7cf KK |
88 | goto fail; |
89 | acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag); | |
90 | acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm); | |
91 | switch (acl->a_entries[i].e_tag) { | |
92 | case ACL_USER_OBJ: | |
93 | case ACL_GROUP_OBJ: | |
94 | case ACL_MASK: | |
95 | case ACL_OTHER: | |
dea80134 | 96 | value += sizeof(struct jffs2_acl_entry_short); |
aa98d7cf KK |
97 | break; |
98 | ||
99 | case ACL_USER: | |
0cfe53d3 EB |
100 | value += sizeof(struct jffs2_acl_entry); |
101 | if (value > end) | |
102 | goto fail; | |
103 | acl->a_entries[i].e_uid = | |
104 | make_kuid(&init_user_ns, | |
105 | je32_to_cpu(entry->e_id)); | |
106 | break; | |
aa98d7cf | 107 | case ACL_GROUP: |
dea80134 KK |
108 | value += sizeof(struct jffs2_acl_entry); |
109 | if (value > end) | |
aa98d7cf | 110 | goto fail; |
0cfe53d3 EB |
111 | acl->a_entries[i].e_gid = |
112 | make_kgid(&init_user_ns, | |
113 | je32_to_cpu(entry->e_id)); | |
aa98d7cf KK |
114 | break; |
115 | ||
116 | default: | |
117 | goto fail; | |
118 | } | |
119 | } | |
120 | if (value != end) | |
121 | goto fail; | |
122 | return acl; | |
123 | fail: | |
124 | posix_acl_release(acl); | |
125 | return ERR_PTR(-EINVAL); | |
126 | } | |
127 | ||
128 | static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) | |
129 | { | |
dea80134 KK |
130 | struct jffs2_acl_header *header; |
131 | struct jffs2_acl_entry *entry; | |
132 | void *e; | |
aa98d7cf KK |
133 | size_t i; |
134 | ||
135 | *size = jffs2_acl_size(acl->a_count); | |
dea80134 KK |
136 | header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL); |
137 | if (!header) | |
aa98d7cf | 138 | return ERR_PTR(-ENOMEM); |
dea80134 KK |
139 | header->a_version = cpu_to_je32(JFFS2_ACL_VERSION); |
140 | e = header + 1; | |
aa98d7cf | 141 | for (i=0; i < acl->a_count; i++) { |
0cfe53d3 | 142 | const struct posix_acl_entry *acl_e = &acl->a_entries[i]; |
dea80134 | 143 | entry = e; |
0cfe53d3 EB |
144 | entry->e_tag = cpu_to_je16(acl_e->e_tag); |
145 | entry->e_perm = cpu_to_je16(acl_e->e_perm); | |
146 | switch(acl_e->e_tag) { | |
aa98d7cf | 147 | case ACL_USER: |
0cfe53d3 EB |
148 | entry->e_id = cpu_to_je32( |
149 | from_kuid(&init_user_ns, acl_e->e_uid)); | |
150 | e += sizeof(struct jffs2_acl_entry); | |
151 | break; | |
aa98d7cf | 152 | case ACL_GROUP: |
0cfe53d3 EB |
153 | entry->e_id = cpu_to_je32( |
154 | from_kgid(&init_user_ns, acl_e->e_gid)); | |
de1f72fa | 155 | e += sizeof(struct jffs2_acl_entry); |
aa98d7cf KK |
156 | break; |
157 | ||
158 | case ACL_USER_OBJ: | |
159 | case ACL_GROUP_OBJ: | |
160 | case ACL_MASK: | |
161 | case ACL_OTHER: | |
de1f72fa | 162 | e += sizeof(struct jffs2_acl_entry_short); |
aa98d7cf KK |
163 | break; |
164 | ||
165 | default: | |
166 | goto fail; | |
167 | } | |
168 | } | |
dea80134 | 169 | return header; |
aa98d7cf | 170 | fail: |
dea80134 | 171 | kfree(header); |
aa98d7cf KK |
172 | return ERR_PTR(-EINVAL); |
173 | } | |
174 | ||
4e34e719 | 175 | struct posix_acl *jffs2_get_acl(struct inode *inode, int type) |
aa98d7cf | 176 | { |
aa98d7cf KK |
177 | struct posix_acl *acl; |
178 | char *value = NULL; | |
179 | int rc, xprefix; | |
180 | ||
073aaa1b AV |
181 | acl = get_cached_acl(inode, type); |
182 | if (acl != ACL_NOT_CACHED) | |
183 | return acl; | |
184 | ||
aa98d7cf KK |
185 | switch (type) { |
186 | case ACL_TYPE_ACCESS: | |
aa98d7cf KK |
187 | xprefix = JFFS2_XPREFIX_ACL_ACCESS; |
188 | break; | |
189 | case ACL_TYPE_DEFAULT: | |
aa98d7cf KK |
190 | xprefix = JFFS2_XPREFIX_ACL_DEFAULT; |
191 | break; | |
192 | default: | |
073aaa1b | 193 | BUG(); |
aa98d7cf KK |
194 | } |
195 | rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); | |
196 | if (rc > 0) { | |
197 | value = kmalloc(rc, GFP_KERNEL); | |
198 | if (!value) | |
199 | return ERR_PTR(-ENOMEM); | |
200 | rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); | |
201 | } | |
202 | if (rc > 0) { | |
203 | acl = jffs2_acl_from_medium(value, rc); | |
204 | } else if (rc == -ENODATA || rc == -ENOSYS) { | |
205 | acl = NULL; | |
206 | } else { | |
207 | acl = ERR_PTR(rc); | |
208 | } | |
209 | if (value) | |
210 | kfree(value); | |
073aaa1b AV |
211 | if (!IS_ERR(acl)) |
212 | set_cached_acl(inode, type, acl); | |
aa98d7cf KK |
213 | return acl; |
214 | } | |
215 | ||
cfc8dc6f KK |
216 | static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl) |
217 | { | |
218 | char *value = NULL; | |
219 | size_t size = 0; | |
220 | int rc; | |
221 | ||
222 | if (acl) { | |
223 | value = jffs2_acl_to_medium(acl, &size); | |
224 | if (IS_ERR(value)) | |
225 | return PTR_ERR(value); | |
226 | } | |
227 | rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); | |
228 | if (!value && rc == -ENODATA) | |
229 | rc = 0; | |
230 | kfree(value); | |
231 | ||
232 | return rc; | |
233 | } | |
234 | ||
aa98d7cf KK |
235 | static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) |
236 | { | |
aa98d7cf KK |
237 | int rc, xprefix; |
238 | ||
239 | if (S_ISLNK(inode->i_mode)) | |
240 | return -EOPNOTSUPP; | |
241 | ||
242 | switch (type) { | |
243 | case ACL_TYPE_ACCESS: | |
244 | xprefix = JFFS2_XPREFIX_ACL_ACCESS; | |
245 | if (acl) { | |
4b9e9796 S |
246 | umode_t mode; |
247 | ||
248 | rc = posix_acl_update_mode(inode, &mode, &acl); | |
249 | if (rc) | |
aa98d7cf KK |
250 | return rc; |
251 | if (inode->i_mode != mode) { | |
9ed437c5 DW |
252 | struct iattr attr; |
253 | ||
1c24d06f | 254 | attr.ia_valid = ATTR_MODE | ATTR_CTIME; |
9ed437c5 | 255 | attr.ia_mode = mode; |
1c24d06f | 256 | attr.ia_ctime = CURRENT_TIME_SEC; |
9ed437c5 DW |
257 | rc = jffs2_do_setattr(inode, &attr); |
258 | if (rc < 0) | |
259 | return rc; | |
aa98d7cf | 260 | } |
aa98d7cf KK |
261 | } |
262 | break; | |
263 | case ACL_TYPE_DEFAULT: | |
264 | xprefix = JFFS2_XPREFIX_ACL_DEFAULT; | |
265 | if (!S_ISDIR(inode->i_mode)) | |
266 | return acl ? -EACCES : 0; | |
267 | break; | |
268 | default: | |
269 | return -EINVAL; | |
270 | } | |
cfc8dc6f | 271 | rc = __jffs2_set_acl(inode, xprefix, acl); |
073aaa1b AV |
272 | if (!rc) |
273 | set_cached_acl(inode, type, acl); | |
aa98d7cf KK |
274 | return rc; |
275 | } | |
276 | ||
d3fb6120 | 277 | int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode) |
aa98d7cf | 278 | { |
826cae2f | 279 | struct posix_acl *acl; |
cfc8dc6f | 280 | int rc; |
aa98d7cf | 281 | |
72c04902 | 282 | cache_no_acl(inode); |
cfc8dc6f KK |
283 | |
284 | if (S_ISLNK(*i_mode)) | |
285 | return 0; /* Symlink always has no-ACL */ | |
286 | ||
287 | acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT); | |
288 | if (IS_ERR(acl)) | |
289 | return PTR_ERR(acl); | |
290 | ||
291 | if (!acl) { | |
ce3b0f8d | 292 | *i_mode &= ~current_umask(); |
cfc8dc6f KK |
293 | } else { |
294 | if (S_ISDIR(*i_mode)) | |
073aaa1b | 295 | set_cached_acl(inode, ACL_TYPE_DEFAULT, acl); |
9ed437c5 | 296 | |
826cae2f AV |
297 | rc = posix_acl_create(&acl, GFP_KERNEL, i_mode); |
298 | if (rc < 0) | |
cfc8dc6f KK |
299 | return rc; |
300 | if (rc > 0) | |
826cae2f | 301 | set_cached_acl(inode, ACL_TYPE_ACCESS, acl); |
cfc8dc6f | 302 | |
826cae2f | 303 | posix_acl_release(acl); |
aa98d7cf | 304 | } |
cfc8dc6f KK |
305 | return 0; |
306 | } | |
307 | ||
308 | int jffs2_init_acl_post(struct inode *inode) | |
309 | { | |
cfc8dc6f KK |
310 | int rc; |
311 | ||
290c263b AV |
312 | if (inode->i_default_acl) { |
313 | rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl); | |
cfc8dc6f KK |
314 | if (rc) |
315 | return rc; | |
316 | } | |
317 | ||
290c263b AV |
318 | if (inode->i_acl) { |
319 | rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl); | |
cfc8dc6f KK |
320 | if (rc) |
321 | return rc; | |
322 | } | |
323 | ||
8d6ea587 | 324 | return 0; |
aa98d7cf KK |
325 | } |
326 | ||
aa98d7cf KK |
327 | int jffs2_acl_chmod(struct inode *inode) |
328 | { | |
bc26ab5f | 329 | struct posix_acl *acl; |
aa98d7cf KK |
330 | int rc; |
331 | ||
332 | if (S_ISLNK(inode->i_mode)) | |
333 | return -EOPNOTSUPP; | |
334 | acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); | |
335 | if (IS_ERR(acl) || !acl) | |
336 | return PTR_ERR(acl); | |
bc26ab5f AV |
337 | rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
338 | if (rc) | |
339 | return rc; | |
340 | rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl); | |
aa98d7cf | 341 | posix_acl_release(acl); |
aa98d7cf KK |
342 | return rc; |
343 | } | |
344 | ||
431547b3 CH |
345 | static size_t jffs2_acl_access_listxattr(struct dentry *dentry, char *list, |
346 | size_t list_size, const char *name, size_t name_len, int type) | |
aa98d7cf KK |
347 | { |
348 | const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS); | |
349 | ||
350 | if (list && retlen <= list_size) | |
351 | strcpy(list, POSIX_ACL_XATTR_ACCESS); | |
352 | return retlen; | |
353 | } | |
354 | ||
431547b3 CH |
355 | static size_t jffs2_acl_default_listxattr(struct dentry *dentry, char *list, |
356 | size_t list_size, const char *name, size_t name_len, int type) | |
aa98d7cf KK |
357 | { |
358 | const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT); | |
359 | ||
360 | if (list && retlen <= list_size) | |
361 | strcpy(list, POSIX_ACL_XATTR_DEFAULT); | |
362 | return retlen; | |
363 | } | |
364 | ||
431547b3 CH |
365 | static int jffs2_acl_getxattr(struct dentry *dentry, const char *name, |
366 | void *buffer, size_t size, int type) | |
aa98d7cf KK |
367 | { |
368 | struct posix_acl *acl; | |
369 | int rc; | |
370 | ||
431547b3 CH |
371 | if (name[0] != '\0') |
372 | return -EINVAL; | |
373 | ||
374 | acl = jffs2_get_acl(dentry->d_inode, type); | |
aa98d7cf KK |
375 | if (IS_ERR(acl)) |
376 | return PTR_ERR(acl); | |
377 | if (!acl) | |
378 | return -ENODATA; | |
5f3a4a28 | 379 | rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); |
aa98d7cf KK |
380 | posix_acl_release(acl); |
381 | ||
382 | return rc; | |
383 | } | |
384 | ||
431547b3 CH |
385 | static int jffs2_acl_setxattr(struct dentry *dentry, const char *name, |
386 | const void *value, size_t size, int flags, int type) | |
aa98d7cf KK |
387 | { |
388 | struct posix_acl *acl; | |
389 | int rc; | |
390 | ||
431547b3 CH |
391 | if (name[0] != '\0') |
392 | return -EINVAL; | |
2e149670 | 393 | if (!inode_owner_or_capable(dentry->d_inode)) |
aa98d7cf KK |
394 | return -EPERM; |
395 | ||
396 | if (value) { | |
5f3a4a28 | 397 | acl = posix_acl_from_xattr(&init_user_ns, value, size); |
aa98d7cf KK |
398 | if (IS_ERR(acl)) |
399 | return PTR_ERR(acl); | |
400 | if (acl) { | |
401 | rc = posix_acl_valid(acl); | |
402 | if (rc) | |
403 | goto out; | |
404 | } | |
405 | } else { | |
406 | acl = NULL; | |
407 | } | |
431547b3 | 408 | rc = jffs2_set_acl(dentry->d_inode, type, acl); |
aa98d7cf KK |
409 | out: |
410 | posix_acl_release(acl); | |
411 | return rc; | |
412 | } | |
413 | ||
365f0cb9 | 414 | const struct xattr_handler jffs2_acl_access_xattr_handler = { |
aa98d7cf | 415 | .prefix = POSIX_ACL_XATTR_ACCESS, |
431547b3 | 416 | .flags = ACL_TYPE_DEFAULT, |
aa98d7cf | 417 | .list = jffs2_acl_access_listxattr, |
431547b3 CH |
418 | .get = jffs2_acl_getxattr, |
419 | .set = jffs2_acl_setxattr, | |
aa98d7cf KK |
420 | }; |
421 | ||
365f0cb9 | 422 | const struct xattr_handler jffs2_acl_default_xattr_handler = { |
aa98d7cf | 423 | .prefix = POSIX_ACL_XATTR_DEFAULT, |
431547b3 | 424 | .flags = ACL_TYPE_DEFAULT, |
aa98d7cf | 425 | .list = jffs2_acl_default_listxattr, |
431547b3 CH |
426 | .get = jffs2_acl_getxattr, |
427 | .set = jffs2_acl_setxattr, | |
aa98d7cf | 428 | }; |