1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * acl.c |
4 | * |
5 | * Copyright (C) 2004, 2008 Oracle. All rights reserved. |
6 | * |
7 | * CREDITS: |
8 | * Lots of code in this file is copy from linux/fs/ext3/acl.c. |
9 | * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de> |
10 | */ |
11 | |
12 | #include <linux/init.h> |
13 | #include <linux/module.h> |
14 | #include <linux/slab.h> |
15 | #include <linux/string.h> |
16 | |
17 | #include <cluster/masklog.h> |
18 | |
19 | #include "ocfs2.h" |
20 | #include "alloc.h" |
21 | #include "dlmglue.h" |
22 | #include "file.h" |
23 | #include "inode.h" |
24 | #include "journal.h" |
25 | #include "ocfs2_fs.h" |
26 | |
27 | #include "xattr.h" |
28 | #include "acl.h" |
29 | |
30 | /* |
31 | * Convert from xattr value to acl struct. |
32 | */ |
33 | static struct posix_acl *ocfs2_acl_from_xattr(const void *value, size_t size) |
34 | { |
35 | int n, count; |
36 | struct posix_acl *acl; |
37 | |
38 | if (!value) |
39 | return NULL; |
40 | if (size < sizeof(struct posix_acl_entry)) |
41 | return ERR_PTR(error: -EINVAL); |
42 | |
43 | count = size / sizeof(struct posix_acl_entry); |
44 | |
45 | acl = posix_acl_alloc(count, GFP_NOFS); |
46 | if (!acl) |
47 | return ERR_PTR(error: -ENOMEM); |
48 | for (n = 0; n < count; n++) { |
49 | struct ocfs2_acl_entry *entry = |
50 | (struct ocfs2_acl_entry *)value; |
51 | |
52 | acl->a_entries[n].e_tag = le16_to_cpu(entry->e_tag); |
53 | acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm); |
54 | switch(acl->a_entries[n].e_tag) { |
55 | case ACL_USER: |
56 | acl->a_entries[n].e_uid = |
57 | make_kuid(from: &init_user_ns, |
58 | le32_to_cpu(entry->e_id)); |
59 | break; |
60 | case ACL_GROUP: |
61 | acl->a_entries[n].e_gid = |
62 | make_kgid(from: &init_user_ns, |
63 | le32_to_cpu(entry->e_id)); |
64 | break; |
65 | default: |
66 | break; |
67 | } |
68 | value += sizeof(struct posix_acl_entry); |
69 | |
70 | } |
71 | return acl; |
72 | } |
73 | |
74 | /* |
75 | * Convert acl struct to xattr value. |
76 | */ |
77 | static void *ocfs2_acl_to_xattr(const struct posix_acl *acl, size_t *size) |
78 | { |
79 | struct ocfs2_acl_entry *entry = NULL; |
80 | char *ocfs2_acl; |
81 | size_t n; |
82 | |
83 | *size = acl->a_count * sizeof(struct posix_acl_entry); |
84 | |
85 | ocfs2_acl = kmalloc(size: *size, GFP_NOFS); |
86 | if (!ocfs2_acl) |
87 | return ERR_PTR(error: -ENOMEM); |
88 | |
89 | entry = (struct ocfs2_acl_entry *)ocfs2_acl; |
90 | for (n = 0; n < acl->a_count; n++, entry++) { |
91 | entry->e_tag = cpu_to_le16(acl->a_entries[n].e_tag); |
92 | entry->e_perm = cpu_to_le16(acl->a_entries[n].e_perm); |
93 | switch(acl->a_entries[n].e_tag) { |
94 | case ACL_USER: |
95 | entry->e_id = cpu_to_le32( |
96 | from_kuid(&init_user_ns, |
97 | acl->a_entries[n].e_uid)); |
98 | break; |
99 | case ACL_GROUP: |
100 | entry->e_id = cpu_to_le32( |
101 | from_kgid(&init_user_ns, |
102 | acl->a_entries[n].e_gid)); |
103 | break; |
104 | default: |
105 | entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID); |
106 | break; |
107 | } |
108 | } |
109 | return ocfs2_acl; |
110 | } |
111 | |
112 | static struct posix_acl *ocfs2_get_acl_nolock(struct inode *inode, |
113 | int type, |
114 | struct buffer_head *di_bh) |
115 | { |
116 | int name_index; |
117 | char *value = NULL; |
118 | struct posix_acl *acl; |
119 | int retval; |
120 | |
121 | switch (type) { |
122 | case ACL_TYPE_ACCESS: |
123 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
124 | break; |
125 | case ACL_TYPE_DEFAULT: |
126 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
127 | break; |
128 | default: |
129 | return ERR_PTR(error: -EINVAL); |
130 | } |
131 | |
132 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, "" , NULL, 0); |
133 | if (retval > 0) { |
134 | value = kmalloc(size: retval, GFP_NOFS); |
135 | if (!value) |
136 | return ERR_PTR(error: -ENOMEM); |
137 | retval = ocfs2_xattr_get_nolock(inode, di_bh, name_index, |
138 | "" , value, retval); |
139 | } |
140 | |
141 | if (retval > 0) |
142 | acl = ocfs2_acl_from_xattr(value, size: retval); |
143 | else if (retval == -ENODATA || retval == 0) |
144 | acl = NULL; |
145 | else |
146 | acl = ERR_PTR(error: retval); |
147 | |
148 | kfree(objp: value); |
149 | |
150 | return acl; |
151 | } |
152 | |
153 | /* |
154 | * Helper function to set i_mode in memory and disk. Some call paths |
155 | * will not have di_bh or a journal handle to pass, in which case it |
156 | * will create it's own. |
157 | */ |
158 | static int ocfs2_acl_set_mode(struct inode *inode, struct buffer_head *di_bh, |
159 | handle_t *handle, umode_t new_mode) |
160 | { |
161 | int ret, commit_handle = 0; |
162 | struct ocfs2_dinode *di; |
163 | |
164 | if (di_bh == NULL) { |
165 | ret = ocfs2_read_inode_block(inode, bh: &di_bh); |
166 | if (ret) { |
167 | mlog_errno(ret); |
168 | goto out; |
169 | } |
170 | } else |
171 | get_bh(bh: di_bh); |
172 | |
173 | if (handle == NULL) { |
174 | handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), |
175 | OCFS2_INODE_UPDATE_CREDITS); |
176 | if (IS_ERR(ptr: handle)) { |
177 | ret = PTR_ERR(ptr: handle); |
178 | mlog_errno(ret); |
179 | goto out_brelse; |
180 | } |
181 | |
182 | commit_handle = 1; |
183 | } |
184 | |
185 | di = (struct ocfs2_dinode *)di_bh->b_data; |
186 | ret = ocfs2_journal_access_di(handle, ci: INODE_CACHE(inode), bh: di_bh, |
187 | OCFS2_JOURNAL_ACCESS_WRITE); |
188 | if (ret) { |
189 | mlog_errno(ret); |
190 | goto out_commit; |
191 | } |
192 | |
193 | inode->i_mode = new_mode; |
194 | inode_set_ctime_current(inode); |
195 | di->i_mode = cpu_to_le16(inode->i_mode); |
196 | di->i_ctime = cpu_to_le64(inode_get_ctime_sec(inode)); |
197 | di->i_ctime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode)); |
198 | ocfs2_update_inode_fsync_trans(handle, inode, datasync: 0); |
199 | |
200 | ocfs2_journal_dirty(handle, bh: di_bh); |
201 | |
202 | out_commit: |
203 | if (commit_handle) |
204 | ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle); |
205 | out_brelse: |
206 | brelse(bh: di_bh); |
207 | out: |
208 | return ret; |
209 | } |
210 | |
211 | /* |
212 | * Set the access or default ACL of an inode. |
213 | */ |
214 | static int ocfs2_set_acl(handle_t *handle, |
215 | struct inode *inode, |
216 | struct buffer_head *di_bh, |
217 | int type, |
218 | struct posix_acl *acl, |
219 | struct ocfs2_alloc_context *meta_ac, |
220 | struct ocfs2_alloc_context *data_ac) |
221 | { |
222 | int name_index; |
223 | void *value = NULL; |
224 | size_t size = 0; |
225 | int ret; |
226 | |
227 | if (S_ISLNK(inode->i_mode)) |
228 | return -EOPNOTSUPP; |
229 | |
230 | switch (type) { |
231 | case ACL_TYPE_ACCESS: |
232 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS; |
233 | break; |
234 | case ACL_TYPE_DEFAULT: |
235 | name_index = OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT; |
236 | if (!S_ISDIR(inode->i_mode)) |
237 | return acl ? -EACCES : 0; |
238 | break; |
239 | default: |
240 | return -EINVAL; |
241 | } |
242 | |
243 | if (acl) { |
244 | value = ocfs2_acl_to_xattr(acl, size: &size); |
245 | if (IS_ERR(ptr: value)) |
246 | return (int)PTR_ERR(ptr: value); |
247 | } |
248 | |
249 | if (handle) |
250 | ret = ocfs2_xattr_set_handle(handle, inode, di_bh, name_index, |
251 | "" , value, size, 0, |
252 | meta_ac, data_ac); |
253 | else |
254 | ret = ocfs2_xattr_set(inode, name_index, "" , value, size, 0); |
255 | |
256 | kfree(objp: value); |
257 | if (!ret) |
258 | set_cached_acl(inode, type, acl); |
259 | |
260 | return ret; |
261 | } |
262 | |
263 | int ocfs2_iop_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, |
264 | struct posix_acl *acl, int type) |
265 | { |
266 | struct buffer_head *bh = NULL; |
267 | int status, had_lock; |
268 | struct ocfs2_lock_holder oh; |
269 | struct inode *inode = d_inode(dentry); |
270 | |
271 | had_lock = ocfs2_inode_lock_tracker(inode, ret_bh: &bh, ex: 1, oh: &oh); |
272 | if (had_lock < 0) |
273 | return had_lock; |
274 | if (type == ACL_TYPE_ACCESS && acl) { |
275 | umode_t mode; |
276 | |
277 | status = posix_acl_update_mode(&nop_mnt_idmap, inode, &mode, |
278 | &acl); |
279 | if (status) |
280 | goto unlock; |
281 | |
282 | status = ocfs2_acl_set_mode(inode, di_bh: bh, NULL, new_mode: mode); |
283 | if (status) |
284 | goto unlock; |
285 | } |
286 | status = ocfs2_set_acl(NULL, inode, di_bh: bh, type, acl, NULL, NULL); |
287 | unlock: |
288 | ocfs2_inode_unlock_tracker(inode, ex: 1, oh: &oh, had_lock); |
289 | brelse(bh); |
290 | return status; |
291 | } |
292 | |
293 | struct posix_acl *ocfs2_iop_get_acl(struct inode *inode, int type, bool rcu) |
294 | { |
295 | struct ocfs2_super *osb; |
296 | struct buffer_head *di_bh = NULL; |
297 | struct posix_acl *acl; |
298 | int had_lock; |
299 | struct ocfs2_lock_holder oh; |
300 | |
301 | if (rcu) |
302 | return ERR_PTR(error: -ECHILD); |
303 | |
304 | osb = OCFS2_SB(inode->i_sb); |
305 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
306 | return NULL; |
307 | |
308 | had_lock = ocfs2_inode_lock_tracker(inode, ret_bh: &di_bh, ex: 0, oh: &oh); |
309 | if (had_lock < 0) |
310 | return ERR_PTR(error: had_lock); |
311 | |
312 | down_read(sem: &OCFS2_I(inode)->ip_xattr_sem); |
313 | acl = ocfs2_get_acl_nolock(inode, type, di_bh); |
314 | up_read(sem: &OCFS2_I(inode)->ip_xattr_sem); |
315 | |
316 | ocfs2_inode_unlock_tracker(inode, ex: 0, oh: &oh, had_lock); |
317 | brelse(bh: di_bh); |
318 | return acl; |
319 | } |
320 | |
321 | int ocfs2_acl_chmod(struct inode *inode, struct buffer_head *bh) |
322 | { |
323 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
324 | struct posix_acl *acl; |
325 | int ret; |
326 | |
327 | if (S_ISLNK(inode->i_mode)) |
328 | return -EOPNOTSUPP; |
329 | |
330 | if (!(osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL)) |
331 | return 0; |
332 | |
333 | down_read(sem: &OCFS2_I(inode)->ip_xattr_sem); |
334 | acl = ocfs2_get_acl_nolock(inode, ACL_TYPE_ACCESS, di_bh: bh); |
335 | up_read(sem: &OCFS2_I(inode)->ip_xattr_sem); |
336 | if (IS_ERR_OR_NULL(ptr: acl)) |
337 | return PTR_ERR_OR_ZERO(ptr: acl); |
338 | ret = __posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode); |
339 | if (ret) |
340 | return ret; |
341 | ret = ocfs2_set_acl(NULL, inode, NULL, ACL_TYPE_ACCESS, |
342 | acl, NULL, NULL); |
343 | posix_acl_release(acl); |
344 | return ret; |
345 | } |
346 | |
347 | /* |
348 | * Initialize the ACLs of a new inode. If parent directory has default ACL, |
349 | * then clone to new inode. Called from ocfs2_mknod. |
350 | */ |
351 | int ocfs2_init_acl(handle_t *handle, |
352 | struct inode *inode, |
353 | struct inode *dir, |
354 | struct buffer_head *di_bh, |
355 | struct buffer_head *dir_bh, |
356 | struct ocfs2_alloc_context *meta_ac, |
357 | struct ocfs2_alloc_context *data_ac) |
358 | { |
359 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); |
360 | struct posix_acl *acl = NULL; |
361 | int ret = 0, ret2; |
362 | umode_t mode; |
363 | |
364 | if (!S_ISLNK(inode->i_mode)) { |
365 | if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) { |
366 | down_read(sem: &OCFS2_I(inode: dir)->ip_xattr_sem); |
367 | acl = ocfs2_get_acl_nolock(inode: dir, ACL_TYPE_DEFAULT, |
368 | di_bh: dir_bh); |
369 | up_read(sem: &OCFS2_I(inode: dir)->ip_xattr_sem); |
370 | if (IS_ERR(ptr: acl)) |
371 | return PTR_ERR(ptr: acl); |
372 | } |
373 | if (!acl) { |
374 | mode = inode->i_mode & ~current_umask(); |
375 | ret = ocfs2_acl_set_mode(inode, di_bh, handle, new_mode: mode); |
376 | if (ret) { |
377 | mlog_errno(ret); |
378 | goto cleanup; |
379 | } |
380 | } |
381 | } |
382 | if ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) && acl) { |
383 | if (S_ISDIR(inode->i_mode)) { |
384 | ret = ocfs2_set_acl(handle, inode, di_bh, |
385 | ACL_TYPE_DEFAULT, acl, |
386 | meta_ac, data_ac); |
387 | if (ret) |
388 | goto cleanup; |
389 | } |
390 | mode = inode->i_mode; |
391 | ret = __posix_acl_create(&acl, GFP_NOFS, &mode); |
392 | if (ret < 0) |
393 | return ret; |
394 | |
395 | ret2 = ocfs2_acl_set_mode(inode, di_bh, handle, new_mode: mode); |
396 | if (ret2) { |
397 | mlog_errno(ret2); |
398 | ret = ret2; |
399 | goto cleanup; |
400 | } |
401 | if (ret > 0) { |
402 | ret = ocfs2_set_acl(handle, inode, |
403 | di_bh, ACL_TYPE_ACCESS, |
404 | acl, meta_ac, data_ac); |
405 | } |
406 | } |
407 | cleanup: |
408 | posix_acl_release(acl); |
409 | return ret; |
410 | } |
411 | |