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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
16f7e0fe | 2 | #include <linux/capability.h> |
1da177e4 LT |
3 | #include <linux/fs.h> |
4 | #include <linux/posix_acl.h> | |
f466c6fd | 5 | #include "reiserfs.h" |
1da177e4 LT |
6 | #include <linux/errno.h> |
7 | #include <linux/pagemap.h> | |
8 | #include <linux/xattr.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
9a59f452 | 10 | #include <linux/posix_acl_xattr.h> |
c45ac888 | 11 | #include "xattr.h" |
a3063ab8 | 12 | #include "acl.h" |
17093991 | 13 | #include <linux/uaccess.h> |
1da177e4 | 14 | |
47f70d08 | 15 | static int __reiserfs_set_acl(struct reiserfs_transaction_handle *th, |
0ab2621e | 16 | struct inode *inode, int type, |
bd4c625c | 17 | struct posix_acl *acl); |
1da177e4 | 18 | |
47f70d08 CH |
19 | |
20 | int | |
549c7297 CB |
21 | reiserfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode, |
22 | struct posix_acl *acl, int type) | |
1da177e4 | 23 | { |
0ab2621e JM |
24 | int error, error2; |
25 | struct reiserfs_transaction_handle th; | |
26 | size_t jcreate_blocks; | |
47f70d08 | 27 | int size = acl ? posix_acl_xattr_size(acl->a_count) : 0; |
fcea8aed EF |
28 | int update_mode = 0; |
29 | umode_t mode = inode->i_mode; | |
1da177e4 | 30 | |
098297b2 JM |
31 | /* |
32 | * Pessimism: We can't assume that anything from the xattr root up | |
33 | * has been created. | |
34 | */ | |
0ab2621e JM |
35 | |
36 | jcreate_blocks = reiserfs_xattr_jcreate_nblocks(inode) + | |
37 | reiserfs_xattr_nblocks(inode, size) * 2; | |
38 | ||
39 | reiserfs_write_lock(inode->i_sb); | |
40 | error = journal_begin(&th, inode->i_sb, jcreate_blocks); | |
4c05141d | 41 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e | 42 | if (error == 0) { |
6883cd7f | 43 | if (type == ACL_TYPE_ACCESS && acl) { |
e65ce2a5 CB |
44 | error = posix_acl_update_mode(&init_user_ns, inode, |
45 | &mode, &acl); | |
6883cd7f JK |
46 | if (error) |
47 | goto unlock; | |
fcea8aed | 48 | update_mode = 1; |
6883cd7f | 49 | } |
47f70d08 | 50 | error = __reiserfs_set_acl(&th, inode, type, acl); |
fcea8aed EF |
51 | if (!error && update_mode) |
52 | inode->i_mode = mode; | |
6883cd7f | 53 | unlock: |
4c05141d | 54 | reiserfs_write_lock(inode->i_sb); |
58d85426 | 55 | error2 = journal_end(&th); |
4c05141d | 56 | reiserfs_write_unlock(inode->i_sb); |
0ab2621e JM |
57 | if (error2) |
58 | error = error2; | |
59 | } | |
1da177e4 | 60 | |
1da177e4 LT |
61 | return error; |
62 | } | |
63 | ||
1da177e4 LT |
64 | /* |
65 | * Convert from filesystem to in-memory representation. | |
66 | */ | |
9dad943a | 67 | static struct posix_acl *reiserfs_posix_acl_from_disk(const void *value, size_t size) |
1da177e4 LT |
68 | { |
69 | const char *end = (char *)value + size; | |
70 | int n, count; | |
71 | struct posix_acl *acl; | |
72 | ||
73 | if (!value) | |
74 | return NULL; | |
75 | if (size < sizeof(reiserfs_acl_header)) | |
bd4c625c LT |
76 | return ERR_PTR(-EINVAL); |
77 | if (((reiserfs_acl_header *) value)->a_version != | |
1da177e4 LT |
78 | cpu_to_le32(REISERFS_ACL_VERSION)) |
79 | return ERR_PTR(-EINVAL); | |
80 | value = (char *)value + sizeof(reiserfs_acl_header); | |
81 | count = reiserfs_acl_count(size); | |
82 | if (count < 0) | |
83 | return ERR_PTR(-EINVAL); | |
84 | if (count == 0) | |
85 | return NULL; | |
86 | acl = posix_acl_alloc(count, GFP_NOFS); | |
87 | if (!acl) | |
88 | return ERR_PTR(-ENOMEM); | |
bd4c625c LT |
89 | for (n = 0; n < count; n++) { |
90 | reiserfs_acl_entry *entry = (reiserfs_acl_entry *) value; | |
1da177e4 LT |
91 | if ((char *)value + sizeof(reiserfs_acl_entry_short) > end) |
92 | goto fail; | |
bd4c625c | 93 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); |
1da177e4 | 94 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); |
bd4c625c LT |
95 | switch (acl->a_entries[n].e_tag) { |
96 | case ACL_USER_OBJ: | |
97 | case ACL_GROUP_OBJ: | |
98 | case ACL_MASK: | |
99 | case ACL_OTHER: | |
100 | value = (char *)value + | |
101 | sizeof(reiserfs_acl_entry_short); | |
bd4c625c LT |
102 | break; |
103 | ||
104 | case ACL_USER: | |
df814654 EB |
105 | value = (char *)value + sizeof(reiserfs_acl_entry); |
106 | if ((char *)value > end) | |
107 | goto fail; | |
108 | acl->a_entries[n].e_uid = | |
109 | make_kuid(&init_user_ns, | |
110 | le32_to_cpu(entry->e_id)); | |
111 | break; | |
bd4c625c LT |
112 | case ACL_GROUP: |
113 | value = (char *)value + sizeof(reiserfs_acl_entry); | |
114 | if ((char *)value > end) | |
1da177e4 | 115 | goto fail; |
df814654 EB |
116 | acl->a_entries[n].e_gid = |
117 | make_kgid(&init_user_ns, | |
118 | le32_to_cpu(entry->e_id)); | |
bd4c625c LT |
119 | break; |
120 | ||
121 | default: | |
122 | goto fail; | |
1da177e4 LT |
123 | } |
124 | } | |
125 | if (value != end) | |
126 | goto fail; | |
127 | return acl; | |
128 | ||
cf776a7a | 129 | fail: |
1da177e4 LT |
130 | posix_acl_release(acl); |
131 | return ERR_PTR(-EINVAL); | |
132 | } | |
133 | ||
134 | /* | |
135 | * Convert from in-memory to filesystem representation. | |
136 | */ | |
9dad943a | 137 | static void *reiserfs_posix_acl_to_disk(const struct posix_acl *acl, size_t * size) |
1da177e4 LT |
138 | { |
139 | reiserfs_acl_header *ext_acl; | |
140 | char *e; | |
141 | int n; | |
142 | ||
143 | *size = reiserfs_acl_size(acl->a_count); | |
5cbded58 | 144 | ext_acl = kmalloc(sizeof(reiserfs_acl_header) + |
bd4c625c LT |
145 | acl->a_count * |
146 | sizeof(reiserfs_acl_entry), | |
147 | GFP_NOFS); | |
1da177e4 LT |
148 | if (!ext_acl) |
149 | return ERR_PTR(-ENOMEM); | |
150 | ext_acl->a_version = cpu_to_le32(REISERFS_ACL_VERSION); | |
151 | e = (char *)ext_acl + sizeof(reiserfs_acl_header); | |
bd4c625c | 152 | for (n = 0; n < acl->a_count; n++) { |
df814654 | 153 | const struct posix_acl_entry *acl_e = &acl->a_entries[n]; |
bd4c625c LT |
154 | reiserfs_acl_entry *entry = (reiserfs_acl_entry *) e; |
155 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); | |
1da177e4 | 156 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); |
bd4c625c LT |
157 | switch (acl->a_entries[n].e_tag) { |
158 | case ACL_USER: | |
df814654 EB |
159 | entry->e_id = cpu_to_le32( |
160 | from_kuid(&init_user_ns, acl_e->e_uid)); | |
161 | e += sizeof(reiserfs_acl_entry); | |
162 | break; | |
bd4c625c | 163 | case ACL_GROUP: |
df814654 EB |
164 | entry->e_id = cpu_to_le32( |
165 | from_kgid(&init_user_ns, acl_e->e_gid)); | |
bd4c625c LT |
166 | e += sizeof(reiserfs_acl_entry); |
167 | break; | |
168 | ||
169 | case ACL_USER_OBJ: | |
170 | case ACL_GROUP_OBJ: | |
171 | case ACL_MASK: | |
172 | case ACL_OTHER: | |
173 | e += sizeof(reiserfs_acl_entry_short); | |
174 | break; | |
175 | ||
176 | default: | |
177 | goto fail; | |
1da177e4 LT |
178 | } |
179 | } | |
180 | return (char *)ext_acl; | |
181 | ||
cf776a7a | 182 | fail: |
1da177e4 LT |
183 | kfree(ext_acl); |
184 | return ERR_PTR(-EINVAL); | |
185 | } | |
186 | ||
187 | /* | |
188 | * Inode operation get_posix_acl(). | |
189 | * | |
1b1dcc1b | 190 | * inode->i_mutex: down |
1da177e4 LT |
191 | * BKL held [before 2.5.x] |
192 | */ | |
0cad6246 | 193 | struct posix_acl *reiserfs_get_acl(struct inode *inode, int type, bool rcu) |
1da177e4 LT |
194 | { |
195 | char *name, *value; | |
073aaa1b | 196 | struct posix_acl *acl; |
3cdc409c | 197 | int size; |
1da177e4 | 198 | int retval; |
bd4c625c | 199 | |
0cad6246 MS |
200 | if (rcu) |
201 | return ERR_PTR(-ECHILD); | |
202 | ||
bd4c625c LT |
203 | switch (type) { |
204 | case ACL_TYPE_ACCESS: | |
97d79299 | 205 | name = XATTR_NAME_POSIX_ACL_ACCESS; |
bd4c625c LT |
206 | break; |
207 | case ACL_TYPE_DEFAULT: | |
97d79299 | 208 | name = XATTR_NAME_POSIX_ACL_DEFAULT; |
bd4c625c LT |
209 | break; |
210 | default: | |
073aaa1b | 211 | BUG(); |
bd4c625c LT |
212 | } |
213 | ||
bd4c625c | 214 | size = reiserfs_xattr_get(inode, name, NULL, 0); |
3cdc409c | 215 | if (size < 0) { |
b8a7a3a6 | 216 | if (size == -ENODATA || size == -ENOSYS) |
bd4c625c | 217 | return NULL; |
bd4c625c LT |
218 | return ERR_PTR(size); |
219 | } | |
1da177e4 | 220 | |
bd4c625c LT |
221 | value = kmalloc(size, GFP_NOFS); |
222 | if (!value) | |
223 | return ERR_PTR(-ENOMEM); | |
1da177e4 LT |
224 | |
225 | retval = reiserfs_xattr_get(inode, name, value, size); | |
226 | if (retval == -ENODATA || retval == -ENOSYS) { | |
098297b2 JM |
227 | /* |
228 | * This shouldn't actually happen as it should have | |
229 | * been caught above.. but just in case | |
230 | */ | |
1da177e4 | 231 | acl = NULL; |
bd4c625c | 232 | } else if (retval < 0) { |
1da177e4 LT |
233 | acl = ERR_PTR(retval); |
234 | } else { | |
9dad943a | 235 | acl = reiserfs_posix_acl_from_disk(value, retval); |
bd4c625c | 236 | } |
1da177e4 LT |
237 | |
238 | kfree(value); | |
239 | return acl; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Inode operation set_posix_acl(). | |
244 | * | |
1b1dcc1b | 245 | * inode->i_mutex: down |
1da177e4 LT |
246 | * BKL held [before 2.5.x] |
247 | */ | |
248 | static int | |
47f70d08 | 249 | __reiserfs_set_acl(struct reiserfs_transaction_handle *th, struct inode *inode, |
0ab2621e | 250 | int type, struct posix_acl *acl) |
1da177e4 | 251 | { |
bd4c625c | 252 | char *name; |
1da177e4 | 253 | void *value = NULL; |
48b32a35 | 254 | size_t size = 0; |
1da177e4 | 255 | int error; |
1da177e4 | 256 | |
bd4c625c LT |
257 | switch (type) { |
258 | case ACL_TYPE_ACCESS: | |
97d79299 | 259 | name = XATTR_NAME_POSIX_ACL_ACCESS; |
bd4c625c LT |
260 | break; |
261 | case ACL_TYPE_DEFAULT: | |
97d79299 | 262 | name = XATTR_NAME_POSIX_ACL_DEFAULT; |
bd4c625c LT |
263 | if (!S_ISDIR(inode->i_mode)) |
264 | return acl ? -EACCES : 0; | |
265 | break; | |
266 | default: | |
267 | return -EINVAL; | |
268 | } | |
269 | ||
270 | if (acl) { | |
9dad943a | 271 | value = reiserfs_posix_acl_to_disk(acl, &size); |
bd4c625c LT |
272 | if (IS_ERR(value)) |
273 | return (int)PTR_ERR(value); | |
48b32a35 JM |
274 | } |
275 | ||
0ab2621e | 276 | error = reiserfs_xattr_set_handle(th, inode, name, value, size, 0); |
48b32a35 JM |
277 | |
278 | /* | |
279 | * Ensure that the inode gets dirtied if we're only using | |
280 | * the mode bits and an old ACL didn't exist. We don't need | |
281 | * to check if the inode is hashed here since we won't get | |
282 | * called by reiserfs_inherit_default_acl(). | |
283 | */ | |
284 | if (error == -ENODATA) { | |
285 | error = 0; | |
286 | if (type == ACL_TYPE_ACCESS) { | |
02027d42 | 287 | inode->i_ctime = current_time(inode); |
bd4c625c | 288 | mark_inode_dirty(inode); |
bd4c625c LT |
289 | } |
290 | } | |
1da177e4 | 291 | |
833d304b | 292 | kfree(value); |
1da177e4 | 293 | |
d984561b | 294 | if (!error) |
073aaa1b | 295 | set_cached_acl(inode, type, acl); |
1da177e4 LT |
296 | |
297 | return error; | |
298 | } | |
299 | ||
098297b2 JM |
300 | /* |
301 | * dir->i_mutex: locked, | |
302 | * inode is new and not released into the wild yet | |
303 | */ | |
1da177e4 | 304 | int |
0ab2621e JM |
305 | reiserfs_inherit_default_acl(struct reiserfs_transaction_handle *th, |
306 | struct inode *dir, struct dentry *dentry, | |
bd4c625c | 307 | struct inode *inode) |
1da177e4 | 308 | { |
47f70d08 | 309 | struct posix_acl *default_acl, *acl; |
bd4c625c LT |
310 | int err = 0; |
311 | ||
312 | /* ACLs only get applied to files and directories */ | |
313 | if (S_ISLNK(inode->i_mode)) | |
314 | return 0; | |
315 | ||
098297b2 JM |
316 | /* |
317 | * ACLs can only be used on "new" objects, so if it's an old object | |
318 | * there is nothing to inherit from | |
319 | */ | |
bd4c625c LT |
320 | if (get_inode_sd_version(dir) == STAT_DATA_V1) |
321 | goto apply_umask; | |
322 | ||
098297b2 JM |
323 | /* |
324 | * Don't apply ACLs to objects in the .reiserfs_priv tree.. This | |
bd4c625c | 325 | * would be useless since permissions are ignored, and a pain because |
098297b2 JM |
326 | * it introduces locking cycles |
327 | */ | |
60e4cf67 | 328 | if (IS_PRIVATE(inode)) |
bd4c625c | 329 | goto apply_umask; |
bd4c625c | 330 | |
47f70d08 CH |
331 | err = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl); |
332 | if (err) | |
333 | return err; | |
bd4c625c | 334 | |
47f70d08 CH |
335 | if (default_acl) { |
336 | err = __reiserfs_set_acl(th, inode, ACL_TYPE_DEFAULT, | |
337 | default_acl); | |
338 | posix_acl_release(default_acl); | |
339 | } | |
bd4c625c | 340 | if (acl) { |
47f70d08 CH |
341 | if (!err) |
342 | err = __reiserfs_set_acl(th, inode, ACL_TYPE_ACCESS, | |
343 | acl); | |
bd4c625c | 344 | posix_acl_release(acl); |
bd4c625c LT |
345 | } |
346 | ||
347 | return err; | |
47f70d08 | 348 | |
cf776a7a | 349 | apply_umask: |
47f70d08 CH |
350 | /* no ACL, apply umask */ |
351 | inode->i_mode &= ~current_umask(); | |
352 | return err; | |
1da177e4 LT |
353 | } |
354 | ||
0ab2621e JM |
355 | /* This is used to cache the default acl before a new object is created. |
356 | * The biggest reason for this is to get an idea of how many blocks will | |
357 | * actually be required for the create operation if we must inherit an ACL. | |
358 | * An ACL write can add up to 3 object creations and an additional file write | |
359 | * so we'd prefer not to reserve that many blocks in the journal if we can. | |
360 | * It also has the advantage of not loading the ACL with a transaction open, | |
361 | * this may seem silly, but if the owner of the directory is doing the | |
362 | * creation, the ACL may not be loaded since the permissions wouldn't require | |
363 | * it. | |
364 | * We return the number of blocks required for the transaction. | |
365 | */ | |
bd4c625c | 366 | int reiserfs_cache_default_acl(struct inode *inode) |
1da177e4 | 367 | { |
0ab2621e JM |
368 | struct posix_acl *acl; |
369 | int nblocks = 0; | |
370 | ||
371 | if (IS_PRIVATE(inode)) | |
372 | return 0; | |
373 | ||
7dffc87f | 374 | acl = get_acl(inode, ACL_TYPE_DEFAULT); |
0ab2621e JM |
375 | |
376 | if (acl && !IS_ERR(acl)) { | |
377 | int size = reiserfs_acl_size(acl->a_count); | |
378 | ||
379 | /* Other xattrs can be created during inode creation. We don't | |
380 | * want to claim too many blocks, so we check to see if we | |
9436fb4d | 381 | * need to create the tree to the xattrs, and then we |
0ab2621e JM |
382 | * just want two files. */ |
383 | nblocks = reiserfs_xattr_jcreate_nblocks(inode); | |
384 | nblocks += JOURNAL_BLOCKS_PER_OBJECT(inode->i_sb); | |
385 | ||
386 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; | |
387 | ||
388 | /* We need to account for writes + bitmaps for two files */ | |
389 | nblocks += reiserfs_xattr_nblocks(inode, size) * 4; | |
390 | posix_acl_release(acl); | |
bd4c625c LT |
391 | } |
392 | ||
0ab2621e | 393 | return nblocks; |
1da177e4 LT |
394 | } |
395 | ||
4c05141d JM |
396 | /* |
397 | * Called under i_mutex | |
398 | */ | |
bd4c625c | 399 | int reiserfs_acl_chmod(struct inode *inode) |
1da177e4 | 400 | { |
4a857011 JM |
401 | if (IS_PRIVATE(inode)) |
402 | return 0; | |
bd4c625c | 403 | if (get_inode_sd_version(inode) == STAT_DATA_V1 || |
47f70d08 | 404 | !reiserfs_posixacl(inode->i_sb)) |
bd4c625c | 405 | return 0; |
1da177e4 | 406 | |
e65ce2a5 | 407 | return posix_acl_chmod(&init_user_ns, inode, inode->i_mode); |
1da177e4 | 408 | } |