]>
Commit | Line | Data |
---|---|---|
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 | acl->a_entries[i].e_id = ACL_UNDEFINED_ID; |
98 | break; | |
99 | ||
100 | case ACL_USER: | |
101 | case ACL_GROUP: | |
dea80134 KK |
102 | value += sizeof(struct jffs2_acl_entry); |
103 | if (value > end) | |
aa98d7cf KK |
104 | goto fail; |
105 | acl->a_entries[i].e_id = je32_to_cpu(entry->e_id); | |
106 | break; | |
107 | ||
108 | default: | |
109 | goto fail; | |
110 | } | |
111 | } | |
112 | if (value != end) | |
113 | goto fail; | |
114 | return acl; | |
115 | fail: | |
116 | posix_acl_release(acl); | |
117 | return ERR_PTR(-EINVAL); | |
118 | } | |
119 | ||
120 | static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) | |
121 | { | |
dea80134 KK |
122 | struct jffs2_acl_header *header; |
123 | struct jffs2_acl_entry *entry; | |
124 | void *e; | |
aa98d7cf KK |
125 | size_t i; |
126 | ||
127 | *size = jffs2_acl_size(acl->a_count); | |
dea80134 KK |
128 | header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL); |
129 | if (!header) | |
aa98d7cf | 130 | return ERR_PTR(-ENOMEM); |
dea80134 KK |
131 | header->a_version = cpu_to_je32(JFFS2_ACL_VERSION); |
132 | e = header + 1; | |
aa98d7cf | 133 | for (i=0; i < acl->a_count; i++) { |
dea80134 | 134 | entry = e; |
aa98d7cf KK |
135 | entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag); |
136 | entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm); | |
137 | switch(acl->a_entries[i].e_tag) { | |
138 | case ACL_USER: | |
139 | case ACL_GROUP: | |
140 | entry->e_id = cpu_to_je32(acl->a_entries[i].e_id); | |
de1f72fa | 141 | e += sizeof(struct jffs2_acl_entry); |
aa98d7cf KK |
142 | break; |
143 | ||
144 | case ACL_USER_OBJ: | |
145 | case ACL_GROUP_OBJ: | |
146 | case ACL_MASK: | |
147 | case ACL_OTHER: | |
de1f72fa | 148 | e += sizeof(struct jffs2_acl_entry_short); |
aa98d7cf KK |
149 | break; |
150 | ||
151 | default: | |
152 | goto fail; | |
153 | } | |
154 | } | |
dea80134 | 155 | return header; |
aa98d7cf | 156 | fail: |
dea80134 | 157 | kfree(header); |
aa98d7cf KK |
158 | return ERR_PTR(-EINVAL); |
159 | } | |
160 | ||
4e34e719 | 161 | struct posix_acl *jffs2_get_acl(struct inode *inode, int type) |
aa98d7cf | 162 | { |
aa98d7cf KK |
163 | struct posix_acl *acl; |
164 | char *value = NULL; | |
165 | int rc, xprefix; | |
166 | ||
073aaa1b AV |
167 | acl = get_cached_acl(inode, type); |
168 | if (acl != ACL_NOT_CACHED) | |
169 | return acl; | |
170 | ||
aa98d7cf KK |
171 | switch (type) { |
172 | case ACL_TYPE_ACCESS: | |
aa98d7cf KK |
173 | xprefix = JFFS2_XPREFIX_ACL_ACCESS; |
174 | break; | |
175 | case ACL_TYPE_DEFAULT: | |
aa98d7cf KK |
176 | xprefix = JFFS2_XPREFIX_ACL_DEFAULT; |
177 | break; | |
178 | default: | |
073aaa1b | 179 | BUG(); |
aa98d7cf KK |
180 | } |
181 | rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); | |
182 | if (rc > 0) { | |
183 | value = kmalloc(rc, GFP_KERNEL); | |
184 | if (!value) | |
185 | return ERR_PTR(-ENOMEM); | |
186 | rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); | |
187 | } | |
188 | if (rc > 0) { | |
189 | acl = jffs2_acl_from_medium(value, rc); | |
190 | } else if (rc == -ENODATA || rc == -ENOSYS) { | |
191 | acl = NULL; | |
192 | } else { | |
193 | acl = ERR_PTR(rc); | |
194 | } | |
195 | if (value) | |
196 | kfree(value); | |
073aaa1b AV |
197 | if (!IS_ERR(acl)) |
198 | set_cached_acl(inode, type, acl); | |
aa98d7cf KK |
199 | return acl; |
200 | } | |
201 | ||
cfc8dc6f KK |
202 | static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl) |
203 | { | |
204 | char *value = NULL; | |
205 | size_t size = 0; | |
206 | int rc; | |
207 | ||
208 | if (acl) { | |
209 | value = jffs2_acl_to_medium(acl, &size); | |
210 | if (IS_ERR(value)) | |
211 | return PTR_ERR(value); | |
212 | } | |
213 | rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); | |
214 | if (!value && rc == -ENODATA) | |
215 | rc = 0; | |
216 | kfree(value); | |
217 | ||
218 | return rc; | |
219 | } | |
220 | ||
aa98d7cf KK |
221 | static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl) |
222 | { | |
aa98d7cf KK |
223 | int rc, xprefix; |
224 | ||
225 | if (S_ISLNK(inode->i_mode)) | |
226 | return -EOPNOTSUPP; | |
227 | ||
228 | switch (type) { | |
229 | case ACL_TYPE_ACCESS: | |
230 | xprefix = JFFS2_XPREFIX_ACL_ACCESS; | |
231 | if (acl) { | |
d6952123 | 232 | umode_t mode = inode->i_mode; |
aa98d7cf KK |
233 | rc = posix_acl_equiv_mode(acl, &mode); |
234 | if (rc < 0) | |
235 | return rc; | |
236 | if (inode->i_mode != mode) { | |
9ed437c5 DW |
237 | struct iattr attr; |
238 | ||
1c24d06f | 239 | attr.ia_valid = ATTR_MODE | ATTR_CTIME; |
9ed437c5 | 240 | attr.ia_mode = mode; |
1c24d06f | 241 | attr.ia_ctime = CURRENT_TIME_SEC; |
9ed437c5 DW |
242 | rc = jffs2_do_setattr(inode, &attr); |
243 | if (rc < 0) | |
244 | return rc; | |
aa98d7cf KK |
245 | } |
246 | if (rc == 0) | |
247 | acl = NULL; | |
248 | } | |
249 | break; | |
250 | case ACL_TYPE_DEFAULT: | |
251 | xprefix = JFFS2_XPREFIX_ACL_DEFAULT; | |
252 | if (!S_ISDIR(inode->i_mode)) | |
253 | return acl ? -EACCES : 0; | |
254 | break; | |
255 | default: | |
256 | return -EINVAL; | |
257 | } | |
cfc8dc6f | 258 | rc = __jffs2_set_acl(inode, xprefix, acl); |
073aaa1b AV |
259 | if (!rc) |
260 | set_cached_acl(inode, type, acl); | |
aa98d7cf KK |
261 | return rc; |
262 | } | |
263 | ||
d3fb6120 | 264 | int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode) |
aa98d7cf | 265 | { |
826cae2f | 266 | struct posix_acl *acl; |
cfc8dc6f | 267 | int rc; |
aa98d7cf | 268 | |
72c04902 | 269 | cache_no_acl(inode); |
cfc8dc6f KK |
270 | |
271 | if (S_ISLNK(*i_mode)) | |
272 | return 0; /* Symlink always has no-ACL */ | |
273 | ||
274 | acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT); | |
275 | if (IS_ERR(acl)) | |
276 | return PTR_ERR(acl); | |
277 | ||
278 | if (!acl) { | |
ce3b0f8d | 279 | *i_mode &= ~current_umask(); |
cfc8dc6f KK |
280 | } else { |
281 | if (S_ISDIR(*i_mode)) | |
073aaa1b | 282 | set_cached_acl(inode, ACL_TYPE_DEFAULT, acl); |
9ed437c5 | 283 | |
826cae2f AV |
284 | rc = posix_acl_create(&acl, GFP_KERNEL, i_mode); |
285 | if (rc < 0) | |
cfc8dc6f KK |
286 | return rc; |
287 | if (rc > 0) | |
826cae2f | 288 | set_cached_acl(inode, ACL_TYPE_ACCESS, acl); |
cfc8dc6f | 289 | |
826cae2f | 290 | posix_acl_release(acl); |
aa98d7cf | 291 | } |
cfc8dc6f KK |
292 | return 0; |
293 | } | |
294 | ||
295 | int jffs2_init_acl_post(struct inode *inode) | |
296 | { | |
cfc8dc6f KK |
297 | int rc; |
298 | ||
290c263b AV |
299 | if (inode->i_default_acl) { |
300 | rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl); | |
cfc8dc6f KK |
301 | if (rc) |
302 | return rc; | |
303 | } | |
304 | ||
290c263b AV |
305 | if (inode->i_acl) { |
306 | rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl); | |
cfc8dc6f KK |
307 | if (rc) |
308 | return rc; | |
309 | } | |
310 | ||
8d6ea587 | 311 | return 0; |
aa98d7cf KK |
312 | } |
313 | ||
aa98d7cf KK |
314 | int jffs2_acl_chmod(struct inode *inode) |
315 | { | |
bc26ab5f | 316 | struct posix_acl *acl; |
aa98d7cf KK |
317 | int rc; |
318 | ||
319 | if (S_ISLNK(inode->i_mode)) | |
320 | return -EOPNOTSUPP; | |
321 | acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS); | |
322 | if (IS_ERR(acl) || !acl) | |
323 | return PTR_ERR(acl); | |
bc26ab5f AV |
324 | rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
325 | if (rc) | |
326 | return rc; | |
327 | rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl); | |
aa98d7cf | 328 | posix_acl_release(acl); |
aa98d7cf KK |
329 | return rc; |
330 | } | |
331 | ||
431547b3 CH |
332 | static size_t jffs2_acl_access_listxattr(struct dentry *dentry, char *list, |
333 | size_t list_size, const char *name, size_t name_len, int type) | |
aa98d7cf KK |
334 | { |
335 | const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS); | |
336 | ||
337 | if (list && retlen <= list_size) | |
338 | strcpy(list, POSIX_ACL_XATTR_ACCESS); | |
339 | return retlen; | |
340 | } | |
341 | ||
431547b3 CH |
342 | static size_t jffs2_acl_default_listxattr(struct dentry *dentry, char *list, |
343 | size_t list_size, const char *name, size_t name_len, int type) | |
aa98d7cf KK |
344 | { |
345 | const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT); | |
346 | ||
347 | if (list && retlen <= list_size) | |
348 | strcpy(list, POSIX_ACL_XATTR_DEFAULT); | |
349 | return retlen; | |
350 | } | |
351 | ||
431547b3 CH |
352 | static int jffs2_acl_getxattr(struct dentry *dentry, const char *name, |
353 | void *buffer, size_t size, int type) | |
aa98d7cf KK |
354 | { |
355 | struct posix_acl *acl; | |
356 | int rc; | |
357 | ||
431547b3 CH |
358 | if (name[0] != '\0') |
359 | return -EINVAL; | |
360 | ||
361 | acl = jffs2_get_acl(dentry->d_inode, type); | |
aa98d7cf KK |
362 | if (IS_ERR(acl)) |
363 | return PTR_ERR(acl); | |
364 | if (!acl) | |
365 | return -ENODATA; | |
366 | rc = posix_acl_to_xattr(acl, buffer, size); | |
367 | posix_acl_release(acl); | |
368 | ||
369 | return rc; | |
370 | } | |
371 | ||
431547b3 CH |
372 | static int jffs2_acl_setxattr(struct dentry *dentry, const char *name, |
373 | const void *value, size_t size, int flags, int type) | |
aa98d7cf KK |
374 | { |
375 | struct posix_acl *acl; | |
376 | int rc; | |
377 | ||
431547b3 CH |
378 | if (name[0] != '\0') |
379 | return -EINVAL; | |
2e149670 | 380 | if (!inode_owner_or_capable(dentry->d_inode)) |
aa98d7cf KK |
381 | return -EPERM; |
382 | ||
383 | if (value) { | |
384 | acl = posix_acl_from_xattr(value, size); | |
385 | if (IS_ERR(acl)) | |
386 | return PTR_ERR(acl); | |
387 | if (acl) { | |
388 | rc = posix_acl_valid(acl); | |
389 | if (rc) | |
390 | goto out; | |
391 | } | |
392 | } else { | |
393 | acl = NULL; | |
394 | } | |
431547b3 | 395 | rc = jffs2_set_acl(dentry->d_inode, type, acl); |
aa98d7cf KK |
396 | out: |
397 | posix_acl_release(acl); | |
398 | return rc; | |
399 | } | |
400 | ||
365f0cb9 | 401 | const struct xattr_handler jffs2_acl_access_xattr_handler = { |
aa98d7cf | 402 | .prefix = POSIX_ACL_XATTR_ACCESS, |
431547b3 | 403 | .flags = ACL_TYPE_DEFAULT, |
aa98d7cf | 404 | .list = jffs2_acl_access_listxattr, |
431547b3 CH |
405 | .get = jffs2_acl_getxattr, |
406 | .set = jffs2_acl_setxattr, | |
aa98d7cf KK |
407 | }; |
408 | ||
365f0cb9 | 409 | const struct xattr_handler jffs2_acl_default_xattr_handler = { |
aa98d7cf | 410 | .prefix = POSIX_ACL_XATTR_DEFAULT, |
431547b3 | 411 | .flags = ACL_TYPE_DEFAULT, |
aa98d7cf | 412 | .list = jffs2_acl_default_listxattr, |
431547b3 CH |
413 | .get = jffs2_acl_getxattr, |
414 | .set = jffs2_acl_setxattr, | |
aa98d7cf | 415 | }; |