1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * eCryptfs: Linux filesystem encryption layer |
4 | * |
5 | * Copyright (C) 1997-2004 Erez Zadok |
6 | * Copyright (C) 2001-2004 Stony Brook University |
7 | * Copyright (C) 2004-2007 International Business Machines Corp. |
8 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
9 | * Michael C. Thompsion <mcthomps@us.ibm.com> |
10 | */ |
11 | |
12 | #include <linux/file.h> |
13 | #include <linux/vmalloc.h> |
14 | #include <linux/pagemap.h> |
15 | #include <linux/dcache.h> |
16 | #include <linux/namei.h> |
17 | #include <linux/mount.h> |
18 | #include <linux/fs_stack.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/xattr.h> |
21 | #include <linux/posix_acl.h> |
22 | #include <linux/posix_acl_xattr.h> |
23 | #include <linux/fileattr.h> |
24 | #include <asm/unaligned.h> |
25 | #include "ecryptfs_kernel.h" |
26 | |
27 | static int lock_parent(struct dentry *dentry, |
28 | struct dentry **lower_dentry, |
29 | struct inode **lower_dir) |
30 | { |
31 | struct dentry *lower_dir_dentry; |
32 | |
33 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry: dentry->d_parent); |
34 | *lower_dir = d_inode(dentry: lower_dir_dentry); |
35 | *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
36 | |
37 | inode_lock_nested(inode: *lower_dir, subclass: I_MUTEX_PARENT); |
38 | return (*lower_dentry)->d_parent == lower_dir_dentry ? 0 : -EINVAL; |
39 | } |
40 | |
41 | static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) |
42 | { |
43 | return ecryptfs_inode_to_lower(inode) == lower_inode; |
44 | } |
45 | |
46 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
47 | { |
48 | struct inode *lower_inode = opaque; |
49 | |
50 | ecryptfs_set_inode_lower(inode, lower_inode); |
51 | fsstack_copy_attr_all(dest: inode, src: lower_inode); |
52 | /* i_size will be overwritten for encrypted regular files */ |
53 | fsstack_copy_inode_size(dst: inode, src: lower_inode); |
54 | inode->i_ino = lower_inode->i_ino; |
55 | inode->i_mapping->a_ops = &ecryptfs_aops; |
56 | |
57 | if (S_ISLNK(inode->i_mode)) |
58 | inode->i_op = &ecryptfs_symlink_iops; |
59 | else if (S_ISDIR(inode->i_mode)) |
60 | inode->i_op = &ecryptfs_dir_iops; |
61 | else |
62 | inode->i_op = &ecryptfs_main_iops; |
63 | |
64 | if (S_ISDIR(inode->i_mode)) |
65 | inode->i_fop = &ecryptfs_dir_fops; |
66 | else if (special_file(inode->i_mode)) |
67 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
68 | else |
69 | inode->i_fop = &ecryptfs_main_fops; |
70 | |
71 | return 0; |
72 | } |
73 | |
74 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
75 | struct super_block *sb) |
76 | { |
77 | struct inode *inode; |
78 | |
79 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
80 | return ERR_PTR(error: -EXDEV); |
81 | |
82 | /* Reject dealing with casefold directories. */ |
83 | if (IS_CASEFOLDED(lower_inode)) { |
84 | pr_err_ratelimited("%s: Can't handle casefolded directory.\n" , |
85 | __func__); |
86 | return ERR_PTR(error: -EREMOTE); |
87 | } |
88 | |
89 | if (!igrab(lower_inode)) |
90 | return ERR_PTR(error: -ESTALE); |
91 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
92 | test: ecryptfs_inode_test, set: ecryptfs_inode_set, |
93 | lower_inode); |
94 | if (!inode) { |
95 | iput(lower_inode); |
96 | return ERR_PTR(error: -EACCES); |
97 | } |
98 | if (!(inode->i_state & I_NEW)) |
99 | iput(lower_inode); |
100 | |
101 | return inode; |
102 | } |
103 | |
104 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, |
105 | struct super_block *sb) |
106 | { |
107 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); |
108 | |
109 | if (!IS_ERR(ptr: inode) && (inode->i_state & I_NEW)) |
110 | unlock_new_inode(inode); |
111 | |
112 | return inode; |
113 | } |
114 | |
115 | /** |
116 | * ecryptfs_interpose |
117 | * @lower_dentry: Existing dentry in the lower filesystem |
118 | * @dentry: ecryptfs' dentry |
119 | * @sb: ecryptfs's super_block |
120 | * |
121 | * Interposes upper and lower dentries. |
122 | * |
123 | * Returns zero on success; non-zero otherwise |
124 | */ |
125 | static int ecryptfs_interpose(struct dentry *lower_dentry, |
126 | struct dentry *dentry, struct super_block *sb) |
127 | { |
128 | struct inode *inode = ecryptfs_get_inode(lower_inode: d_inode(dentry: lower_dentry), sb); |
129 | |
130 | if (IS_ERR(ptr: inode)) |
131 | return PTR_ERR(ptr: inode); |
132 | d_instantiate(dentry, inode); |
133 | |
134 | return 0; |
135 | } |
136 | |
137 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
138 | struct inode *inode) |
139 | { |
140 | struct dentry *lower_dentry; |
141 | struct inode *lower_dir; |
142 | int rc; |
143 | |
144 | rc = lock_parent(dentry, lower_dentry: &lower_dentry, lower_dir: &lower_dir); |
145 | dget(dentry: lower_dentry); // don't even try to make the lower negative |
146 | if (!rc) { |
147 | if (d_unhashed(dentry: lower_dentry)) |
148 | rc = -EINVAL; |
149 | else |
150 | rc = vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry, |
151 | NULL); |
152 | } |
153 | if (rc) { |
154 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n" , rc); |
155 | goto out_unlock; |
156 | } |
157 | fsstack_copy_attr_times(dest: dir, src: lower_dir); |
158 | set_nlink(inode, nlink: ecryptfs_inode_to_lower(inode)->i_nlink); |
159 | inode_set_ctime_to_ts(inode, ts: inode_get_ctime(inode: dir)); |
160 | out_unlock: |
161 | dput(lower_dentry); |
162 | inode_unlock(inode: lower_dir); |
163 | if (!rc) |
164 | d_drop(dentry); |
165 | return rc; |
166 | } |
167 | |
168 | /** |
169 | * ecryptfs_do_create |
170 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs |
171 | * @ecryptfs_dentry: New file's dentry in ecryptfs |
172 | * @mode: The mode of the new file |
173 | * |
174 | * Creates the underlying file and the eCryptfs inode which will link to |
175 | * it. It will also update the eCryptfs directory inode to mimic the |
176 | * stat of the lower directory inode. |
177 | * |
178 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
179 | */ |
180 | static struct inode * |
181 | ecryptfs_do_create(struct inode *directory_inode, |
182 | struct dentry *ecryptfs_dentry, umode_t mode) |
183 | { |
184 | int rc; |
185 | struct dentry *lower_dentry; |
186 | struct inode *lower_dir; |
187 | struct inode *inode; |
188 | |
189 | rc = lock_parent(dentry: ecryptfs_dentry, lower_dentry: &lower_dentry, lower_dir: &lower_dir); |
190 | if (!rc) |
191 | rc = vfs_create(&nop_mnt_idmap, lower_dir, |
192 | lower_dentry, mode, true); |
193 | if (rc) { |
194 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
195 | "rc = [%d]\n" , __func__, rc); |
196 | inode = ERR_PTR(error: rc); |
197 | goto out_lock; |
198 | } |
199 | inode = __ecryptfs_get_inode(lower_inode: d_inode(dentry: lower_dentry), |
200 | sb: directory_inode->i_sb); |
201 | if (IS_ERR(ptr: inode)) { |
202 | vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry, NULL); |
203 | goto out_lock; |
204 | } |
205 | fsstack_copy_attr_times(dest: directory_inode, src: lower_dir); |
206 | fsstack_copy_inode_size(dst: directory_inode, src: lower_dir); |
207 | out_lock: |
208 | inode_unlock(inode: lower_dir); |
209 | return inode; |
210 | } |
211 | |
212 | /* |
213 | * ecryptfs_initialize_file |
214 | * |
215 | * Cause the file to be changed from a basic empty file to an ecryptfs |
216 | * file with a header and first data page. |
217 | * |
218 | * Returns zero on success |
219 | */ |
220 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
221 | struct inode *ecryptfs_inode) |
222 | { |
223 | struct ecryptfs_crypt_stat *crypt_stat = |
224 | &ecryptfs_inode_to_private(inode: ecryptfs_inode)->crypt_stat; |
225 | int rc = 0; |
226 | |
227 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
228 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n" ); |
229 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
230 | goto out; |
231 | } |
232 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n" ); |
233 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
234 | if (rc) { |
235 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
236 | "context; rc = [%d]\n" , rc); |
237 | goto out; |
238 | } |
239 | rc = ecryptfs_get_lower_file(dentry: ecryptfs_dentry, inode: ecryptfs_inode); |
240 | if (rc) { |
241 | printk(KERN_ERR "%s: Error attempting to initialize " |
242 | "the lower file for the dentry with name " |
243 | "[%pd]; rc = [%d]\n" , __func__, |
244 | ecryptfs_dentry, rc); |
245 | goto out; |
246 | } |
247 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
248 | if (rc) |
249 | printk(KERN_ERR "Error writing headers; rc = [%d]\n" , rc); |
250 | ecryptfs_put_lower_file(inode: ecryptfs_inode); |
251 | out: |
252 | return rc; |
253 | } |
254 | |
255 | /* |
256 | * ecryptfs_create |
257 | * @mode: The mode of the new file. |
258 | * |
259 | * Creates a new file. |
260 | * |
261 | * Returns zero on success; non-zero on error condition |
262 | */ |
263 | static int |
264 | ecryptfs_create(struct mnt_idmap *idmap, |
265 | struct inode *directory_inode, struct dentry *ecryptfs_dentry, |
266 | umode_t mode, bool excl) |
267 | { |
268 | struct inode *ecryptfs_inode; |
269 | int rc; |
270 | |
271 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
272 | mode); |
273 | if (IS_ERR(ptr: ecryptfs_inode)) { |
274 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
275 | "lower filesystem\n" ); |
276 | rc = PTR_ERR(ptr: ecryptfs_inode); |
277 | goto out; |
278 | } |
279 | /* At this point, a file exists on "disk"; we need to make sure |
280 | * that this on disk file is prepared to be an ecryptfs file */ |
281 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
282 | if (rc) { |
283 | ecryptfs_do_unlink(dir: directory_inode, dentry: ecryptfs_dentry, |
284 | inode: ecryptfs_inode); |
285 | iget_failed(ecryptfs_inode); |
286 | goto out; |
287 | } |
288 | d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); |
289 | out: |
290 | return rc; |
291 | } |
292 | |
293 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
294 | { |
295 | struct ecryptfs_crypt_stat *crypt_stat; |
296 | int rc; |
297 | |
298 | rc = ecryptfs_get_lower_file(dentry, inode); |
299 | if (rc) { |
300 | printk(KERN_ERR "%s: Error attempting to initialize " |
301 | "the lower file for the dentry with name " |
302 | "[%pd]; rc = [%d]\n" , __func__, |
303 | dentry, rc); |
304 | return rc; |
305 | } |
306 | |
307 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; |
308 | /* TODO: lock for crypt_stat comparison */ |
309 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) |
310 | ecryptfs_set_default_sizes(crypt_stat); |
311 | |
312 | rc = ecryptfs_read_and_validate_header_region(inode); |
313 | ecryptfs_put_lower_file(inode); |
314 | if (rc) { |
315 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); |
316 | if (!rc) |
317 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
318 | } |
319 | |
320 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ |
321 | return 0; |
322 | } |
323 | |
324 | /* |
325 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
326 | */ |
327 | static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, |
328 | struct dentry *lower_dentry) |
329 | { |
330 | const struct path *path = ecryptfs_dentry_to_lower_path(dentry: dentry->d_parent); |
331 | struct inode *inode, *lower_inode; |
332 | struct ecryptfs_dentry_info *dentry_info; |
333 | int rc = 0; |
334 | |
335 | dentry_info = kmem_cache_alloc(cachep: ecryptfs_dentry_info_cache, GFP_KERNEL); |
336 | if (!dentry_info) { |
337 | dput(lower_dentry); |
338 | return ERR_PTR(error: -ENOMEM); |
339 | } |
340 | |
341 | fsstack_copy_attr_atime(dest: d_inode(dentry: dentry->d_parent), |
342 | src: d_inode(dentry: path->dentry)); |
343 | BUG_ON(!d_count(lower_dentry)); |
344 | |
345 | ecryptfs_set_dentry_private(dentry, dentry_info); |
346 | dentry_info->lower_path.mnt = mntget(mnt: path->mnt); |
347 | dentry_info->lower_path.dentry = lower_dentry; |
348 | |
349 | /* |
350 | * negative dentry can go positive under us here - its parent is not |
351 | * locked. That's OK and that could happen just as we return from |
352 | * ecryptfs_lookup() anyway. Just need to be careful and fetch |
353 | * ->d_inode only once - it's not stable here. |
354 | */ |
355 | lower_inode = READ_ONCE(lower_dentry->d_inode); |
356 | |
357 | if (!lower_inode) { |
358 | /* We want to add because we couldn't find in lower */ |
359 | d_add(dentry, NULL); |
360 | return NULL; |
361 | } |
362 | inode = __ecryptfs_get_inode(lower_inode, sb: dentry->d_sb); |
363 | if (IS_ERR(ptr: inode)) { |
364 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n" , |
365 | __func__, PTR_ERR(inode)); |
366 | return ERR_CAST(ptr: inode); |
367 | } |
368 | if (S_ISREG(inode->i_mode)) { |
369 | rc = ecryptfs_i_size_read(dentry, inode); |
370 | if (rc) { |
371 | make_bad_inode(inode); |
372 | return ERR_PTR(error: rc); |
373 | } |
374 | } |
375 | |
376 | if (inode->i_state & I_NEW) |
377 | unlock_new_inode(inode); |
378 | return d_splice_alias(inode, dentry); |
379 | } |
380 | |
381 | /** |
382 | * ecryptfs_lookup |
383 | * @ecryptfs_dir_inode: The eCryptfs directory inode |
384 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up |
385 | * @flags: lookup flags |
386 | * |
387 | * Find a file on disk. If the file does not exist, then we'll add it to the |
388 | * dentry cache and continue on to read it from the disk. |
389 | */ |
390 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, |
391 | struct dentry *ecryptfs_dentry, |
392 | unsigned int flags) |
393 | { |
394 | char *encrypted_and_encoded_name = NULL; |
395 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
396 | struct dentry *lower_dir_dentry, *lower_dentry; |
397 | const char *name = ecryptfs_dentry->d_name.name; |
398 | size_t len = ecryptfs_dentry->d_name.len; |
399 | struct dentry *res; |
400 | int rc = 0; |
401 | |
402 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry: ecryptfs_dentry->d_parent); |
403 | |
404 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
405 | sb: ecryptfs_dentry->d_sb)->mount_crypt_stat; |
406 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
407 | rc = ecryptfs_encrypt_and_encode_filename( |
408 | encoded_name: &encrypted_and_encoded_name, encoded_name_size: &len, |
409 | mount_crypt_stat, name, name_size: len); |
410 | if (rc) { |
411 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " |
412 | "filename; rc = [%d]\n" , __func__, rc); |
413 | return ERR_PTR(error: rc); |
414 | } |
415 | name = encrypted_and_encoded_name; |
416 | } |
417 | |
418 | lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); |
419 | if (IS_ERR(ptr: lower_dentry)) { |
420 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
421 | "[%ld] on lower_dentry = [%s]\n" , __func__, |
422 | PTR_ERR(lower_dentry), |
423 | name); |
424 | res = ERR_CAST(ptr: lower_dentry); |
425 | } else { |
426 | res = ecryptfs_lookup_interpose(dentry: ecryptfs_dentry, lower_dentry); |
427 | } |
428 | kfree(objp: encrypted_and_encoded_name); |
429 | return res; |
430 | } |
431 | |
432 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, |
433 | struct dentry *new_dentry) |
434 | { |
435 | struct dentry *lower_old_dentry; |
436 | struct dentry *lower_new_dentry; |
437 | struct inode *lower_dir; |
438 | u64 file_size_save; |
439 | int rc; |
440 | |
441 | file_size_save = i_size_read(inode: d_inode(dentry: old_dentry)); |
442 | lower_old_dentry = ecryptfs_dentry_to_lower(dentry: old_dentry); |
443 | rc = lock_parent(dentry: new_dentry, lower_dentry: &lower_new_dentry, lower_dir: &lower_dir); |
444 | if (!rc) |
445 | rc = vfs_link(lower_old_dentry, &nop_mnt_idmap, lower_dir, |
446 | lower_new_dentry, NULL); |
447 | if (rc || d_really_is_negative(dentry: lower_new_dentry)) |
448 | goto out_lock; |
449 | rc = ecryptfs_interpose(lower_dentry: lower_new_dentry, dentry: new_dentry, sb: dir->i_sb); |
450 | if (rc) |
451 | goto out_lock; |
452 | fsstack_copy_attr_times(dest: dir, src: lower_dir); |
453 | fsstack_copy_inode_size(dst: dir, src: lower_dir); |
454 | set_nlink(inode: d_inode(dentry: old_dentry), |
455 | nlink: ecryptfs_inode_to_lower(inode: d_inode(dentry: old_dentry))->i_nlink); |
456 | i_size_write(inode: d_inode(dentry: new_dentry), i_size: file_size_save); |
457 | out_lock: |
458 | inode_unlock(inode: lower_dir); |
459 | return rc; |
460 | } |
461 | |
462 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) |
463 | { |
464 | return ecryptfs_do_unlink(dir, dentry, inode: d_inode(dentry)); |
465 | } |
466 | |
467 | static int ecryptfs_symlink(struct mnt_idmap *idmap, |
468 | struct inode *dir, struct dentry *dentry, |
469 | const char *symname) |
470 | { |
471 | int rc; |
472 | struct dentry *lower_dentry; |
473 | struct inode *lower_dir; |
474 | char *encoded_symname; |
475 | size_t encoded_symlen; |
476 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
477 | |
478 | rc = lock_parent(dentry, lower_dentry: &lower_dentry, lower_dir: &lower_dir); |
479 | if (rc) |
480 | goto out_lock; |
481 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
482 | sb: dir->i_sb)->mount_crypt_stat; |
483 | rc = ecryptfs_encrypt_and_encode_filename(encoded_name: &encoded_symname, |
484 | encoded_name_size: &encoded_symlen, |
485 | mount_crypt_stat, name: symname, |
486 | strlen(symname)); |
487 | if (rc) |
488 | goto out_lock; |
489 | rc = vfs_symlink(&nop_mnt_idmap, lower_dir, lower_dentry, |
490 | encoded_symname); |
491 | kfree(objp: encoded_symname); |
492 | if (rc || d_really_is_negative(dentry: lower_dentry)) |
493 | goto out_lock; |
494 | rc = ecryptfs_interpose(lower_dentry, dentry, sb: dir->i_sb); |
495 | if (rc) |
496 | goto out_lock; |
497 | fsstack_copy_attr_times(dest: dir, src: lower_dir); |
498 | fsstack_copy_inode_size(dst: dir, src: lower_dir); |
499 | out_lock: |
500 | inode_unlock(inode: lower_dir); |
501 | if (d_really_is_negative(dentry)) |
502 | d_drop(dentry); |
503 | return rc; |
504 | } |
505 | |
506 | static int ecryptfs_mkdir(struct mnt_idmap *idmap, struct inode *dir, |
507 | struct dentry *dentry, umode_t mode) |
508 | { |
509 | int rc; |
510 | struct dentry *lower_dentry; |
511 | struct inode *lower_dir; |
512 | |
513 | rc = lock_parent(dentry, lower_dentry: &lower_dentry, lower_dir: &lower_dir); |
514 | if (!rc) |
515 | rc = vfs_mkdir(&nop_mnt_idmap, lower_dir, |
516 | lower_dentry, mode); |
517 | if (rc || d_really_is_negative(dentry: lower_dentry)) |
518 | goto out; |
519 | rc = ecryptfs_interpose(lower_dentry, dentry, sb: dir->i_sb); |
520 | if (rc) |
521 | goto out; |
522 | fsstack_copy_attr_times(dest: dir, src: lower_dir); |
523 | fsstack_copy_inode_size(dst: dir, src: lower_dir); |
524 | set_nlink(inode: dir, nlink: lower_dir->i_nlink); |
525 | out: |
526 | inode_unlock(inode: lower_dir); |
527 | if (d_really_is_negative(dentry)) |
528 | d_drop(dentry); |
529 | return rc; |
530 | } |
531 | |
532 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) |
533 | { |
534 | struct dentry *lower_dentry; |
535 | struct inode *lower_dir; |
536 | int rc; |
537 | |
538 | rc = lock_parent(dentry, lower_dentry: &lower_dentry, lower_dir: &lower_dir); |
539 | dget(dentry: lower_dentry); // don't even try to make the lower negative |
540 | if (!rc) { |
541 | if (d_unhashed(dentry: lower_dentry)) |
542 | rc = -EINVAL; |
543 | else |
544 | rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry); |
545 | } |
546 | if (!rc) { |
547 | clear_nlink(inode: d_inode(dentry)); |
548 | fsstack_copy_attr_times(dest: dir, src: lower_dir); |
549 | set_nlink(inode: dir, nlink: lower_dir->i_nlink); |
550 | } |
551 | dput(lower_dentry); |
552 | inode_unlock(inode: lower_dir); |
553 | if (!rc) |
554 | d_drop(dentry); |
555 | return rc; |
556 | } |
557 | |
558 | static int |
559 | ecryptfs_mknod(struct mnt_idmap *idmap, struct inode *dir, |
560 | struct dentry *dentry, umode_t mode, dev_t dev) |
561 | { |
562 | int rc; |
563 | struct dentry *lower_dentry; |
564 | struct inode *lower_dir; |
565 | |
566 | rc = lock_parent(dentry, lower_dentry: &lower_dentry, lower_dir: &lower_dir); |
567 | if (!rc) |
568 | rc = vfs_mknod(&nop_mnt_idmap, lower_dir, |
569 | lower_dentry, mode, dev); |
570 | if (rc || d_really_is_negative(dentry: lower_dentry)) |
571 | goto out; |
572 | rc = ecryptfs_interpose(lower_dentry, dentry, sb: dir->i_sb); |
573 | if (rc) |
574 | goto out; |
575 | fsstack_copy_attr_times(dest: dir, src: lower_dir); |
576 | fsstack_copy_inode_size(dst: dir, src: lower_dir); |
577 | out: |
578 | inode_unlock(inode: lower_dir); |
579 | if (d_really_is_negative(dentry)) |
580 | d_drop(dentry); |
581 | return rc; |
582 | } |
583 | |
584 | static int |
585 | ecryptfs_rename(struct mnt_idmap *idmap, struct inode *old_dir, |
586 | struct dentry *old_dentry, struct inode *new_dir, |
587 | struct dentry *new_dentry, unsigned int flags) |
588 | { |
589 | int rc; |
590 | struct dentry *lower_old_dentry; |
591 | struct dentry *lower_new_dentry; |
592 | struct dentry *lower_old_dir_dentry; |
593 | struct dentry *lower_new_dir_dentry; |
594 | struct dentry *trap; |
595 | struct inode *target_inode; |
596 | struct renamedata rd = {}; |
597 | |
598 | if (flags) |
599 | return -EINVAL; |
600 | |
601 | lower_old_dir_dentry = ecryptfs_dentry_to_lower(dentry: old_dentry->d_parent); |
602 | lower_new_dir_dentry = ecryptfs_dentry_to_lower(dentry: new_dentry->d_parent); |
603 | |
604 | lower_old_dentry = ecryptfs_dentry_to_lower(dentry: old_dentry); |
605 | lower_new_dentry = ecryptfs_dentry_to_lower(dentry: new_dentry); |
606 | |
607 | target_inode = d_inode(dentry: new_dentry); |
608 | |
609 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
610 | if (IS_ERR(ptr: trap)) |
611 | return PTR_ERR(ptr: trap); |
612 | dget(dentry: lower_new_dentry); |
613 | rc = -EINVAL; |
614 | if (lower_old_dentry->d_parent != lower_old_dir_dentry) |
615 | goto out_lock; |
616 | if (lower_new_dentry->d_parent != lower_new_dir_dentry) |
617 | goto out_lock; |
618 | if (d_unhashed(dentry: lower_old_dentry) || d_unhashed(dentry: lower_new_dentry)) |
619 | goto out_lock; |
620 | /* source should not be ancestor of target */ |
621 | if (trap == lower_old_dentry) |
622 | goto out_lock; |
623 | /* target should not be ancestor of source */ |
624 | if (trap == lower_new_dentry) { |
625 | rc = -ENOTEMPTY; |
626 | goto out_lock; |
627 | } |
628 | |
629 | rd.old_mnt_idmap = &nop_mnt_idmap; |
630 | rd.old_dir = d_inode(dentry: lower_old_dir_dentry); |
631 | rd.old_dentry = lower_old_dentry; |
632 | rd.new_mnt_idmap = &nop_mnt_idmap; |
633 | rd.new_dir = d_inode(dentry: lower_new_dir_dentry); |
634 | rd.new_dentry = lower_new_dentry; |
635 | rc = vfs_rename(&rd); |
636 | if (rc) |
637 | goto out_lock; |
638 | if (target_inode) |
639 | fsstack_copy_attr_all(dest: target_inode, |
640 | src: ecryptfs_inode_to_lower(inode: target_inode)); |
641 | fsstack_copy_attr_all(dest: new_dir, src: d_inode(dentry: lower_new_dir_dentry)); |
642 | if (new_dir != old_dir) |
643 | fsstack_copy_attr_all(dest: old_dir, src: d_inode(dentry: lower_old_dir_dentry)); |
644 | out_lock: |
645 | dput(lower_new_dentry); |
646 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
647 | return rc; |
648 | } |
649 | |
650 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
651 | { |
652 | DEFINE_DELAYED_CALL(done); |
653 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
654 | const char *link; |
655 | char *buf; |
656 | int rc; |
657 | |
658 | link = vfs_get_link(lower_dentry, &done); |
659 | if (IS_ERR(ptr: link)) |
660 | return ERR_CAST(ptr: link); |
661 | |
662 | rc = ecryptfs_decode_and_decrypt_filename(decrypted_name: &buf, decrypted_name_size: bufsiz, sb: dentry->d_sb, |
663 | name: link, strlen(link)); |
664 | do_delayed_call(call: &done); |
665 | if (rc) |
666 | return ERR_PTR(error: rc); |
667 | |
668 | return buf; |
669 | } |
670 | |
671 | static const char *ecryptfs_get_link(struct dentry *dentry, |
672 | struct inode *inode, |
673 | struct delayed_call *done) |
674 | { |
675 | size_t len; |
676 | char *buf; |
677 | |
678 | if (!dentry) |
679 | return ERR_PTR(error: -ECHILD); |
680 | |
681 | buf = ecryptfs_readlink_lower(dentry, bufsiz: &len); |
682 | if (IS_ERR(ptr: buf)) |
683 | return buf; |
684 | fsstack_copy_attr_atime(dest: d_inode(dentry), |
685 | src: d_inode(dentry: ecryptfs_dentry_to_lower(dentry))); |
686 | buf[len] = '\0'; |
687 | set_delayed_call(call: done, fn: kfree_link, arg: buf); |
688 | return buf; |
689 | } |
690 | |
691 | /** |
692 | * upper_size_to_lower_size |
693 | * @crypt_stat: Crypt_stat associated with file |
694 | * @upper_size: Size of the upper file |
695 | * |
696 | * Calculate the required size of the lower file based on the |
697 | * specified size of the upper file. This calculation is based on the |
698 | * number of headers in the underlying file and the extent size. |
699 | * |
700 | * Returns Calculated size of the lower file. |
701 | */ |
702 | static loff_t |
703 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, |
704 | loff_t upper_size) |
705 | { |
706 | loff_t lower_size; |
707 | |
708 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
709 | if (upper_size != 0) { |
710 | loff_t num_extents; |
711 | |
712 | num_extents = upper_size >> crypt_stat->extent_shift; |
713 | if (upper_size & ~crypt_stat->extent_mask) |
714 | num_extents++; |
715 | lower_size += (num_extents * crypt_stat->extent_size); |
716 | } |
717 | return lower_size; |
718 | } |
719 | |
720 | /** |
721 | * truncate_upper |
722 | * @dentry: The ecryptfs layer dentry |
723 | * @ia: Address of the ecryptfs inode's attributes |
724 | * @lower_ia: Address of the lower inode's attributes |
725 | * |
726 | * Function to handle truncations modifying the size of the file. Note |
727 | * that the file sizes are interpolated. When expanding, we are simply |
728 | * writing strings of 0's out. When truncating, we truncate the upper |
729 | * inode and update the lower_ia according to the page index |
730 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, |
731 | * the caller must use lower_ia in a call to notify_change() to perform |
732 | * the truncation of the lower inode. |
733 | * |
734 | * Returns zero on success; non-zero otherwise |
735 | */ |
736 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
737 | struct iattr *lower_ia) |
738 | { |
739 | int rc = 0; |
740 | struct inode *inode = d_inode(dentry); |
741 | struct ecryptfs_crypt_stat *crypt_stat; |
742 | loff_t i_size = i_size_read(inode); |
743 | loff_t lower_size_before_truncate; |
744 | loff_t lower_size_after_truncate; |
745 | |
746 | if (unlikely((ia->ia_size == i_size))) { |
747 | lower_ia->ia_valid &= ~ATTR_SIZE; |
748 | return 0; |
749 | } |
750 | rc = ecryptfs_get_lower_file(dentry, inode); |
751 | if (rc) |
752 | return rc; |
753 | crypt_stat = &ecryptfs_inode_to_private(inode: d_inode(dentry))->crypt_stat; |
754 | /* Switch on growing or shrinking file */ |
755 | if (ia->ia_size > i_size) { |
756 | char zero[] = { 0x00 }; |
757 | |
758 | lower_ia->ia_valid &= ~ATTR_SIZE; |
759 | /* Write a single 0 at the last position of the file; |
760 | * this triggers code that will fill in 0's throughout |
761 | * the intermediate portion of the previous end of the |
762 | * file and the new and of the file */ |
763 | rc = ecryptfs_write(inode, data: zero, |
764 | offset: (ia->ia_size - 1), size: 1); |
765 | } else { /* ia->ia_size < i_size_read(inode) */ |
766 | /* We're chopping off all the pages down to the page |
767 | * in which ia->ia_size is located. Fill in the end of |
768 | * that page from (ia->ia_size & ~PAGE_MASK) to |
769 | * PAGE_SIZE with zeros. */ |
770 | size_t num_zeros = (PAGE_SIZE |
771 | - (ia->ia_size & ~PAGE_MASK)); |
772 | |
773 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
774 | truncate_setsize(inode, newsize: ia->ia_size); |
775 | lower_ia->ia_size = ia->ia_size; |
776 | lower_ia->ia_valid |= ATTR_SIZE; |
777 | goto out; |
778 | } |
779 | if (num_zeros) { |
780 | char *zeros_virt; |
781 | |
782 | zeros_virt = kzalloc(size: num_zeros, GFP_KERNEL); |
783 | if (!zeros_virt) { |
784 | rc = -ENOMEM; |
785 | goto out; |
786 | } |
787 | rc = ecryptfs_write(inode, data: zeros_virt, |
788 | offset: ia->ia_size, size: num_zeros); |
789 | kfree(objp: zeros_virt); |
790 | if (rc) { |
791 | printk(KERN_ERR "Error attempting to zero out " |
792 | "the remainder of the end page on " |
793 | "reducing truncate; rc = [%d]\n" , rc); |
794 | goto out; |
795 | } |
796 | } |
797 | truncate_setsize(inode, newsize: ia->ia_size); |
798 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode: inode); |
799 | if (rc) { |
800 | printk(KERN_ERR "Problem with " |
801 | "ecryptfs_write_inode_size_to_metadata; " |
802 | "rc = [%d]\n" , rc); |
803 | goto out; |
804 | } |
805 | /* We are reducing the size of the ecryptfs file, and need to |
806 | * know if we need to reduce the size of the lower file. */ |
807 | lower_size_before_truncate = |
808 | upper_size_to_lower_size(crypt_stat, upper_size: i_size); |
809 | lower_size_after_truncate = |
810 | upper_size_to_lower_size(crypt_stat, upper_size: ia->ia_size); |
811 | if (lower_size_after_truncate < lower_size_before_truncate) { |
812 | lower_ia->ia_size = lower_size_after_truncate; |
813 | lower_ia->ia_valid |= ATTR_SIZE; |
814 | } else |
815 | lower_ia->ia_valid &= ~ATTR_SIZE; |
816 | } |
817 | out: |
818 | ecryptfs_put_lower_file(inode); |
819 | return rc; |
820 | } |
821 | |
822 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
823 | { |
824 | struct ecryptfs_crypt_stat *crypt_stat; |
825 | loff_t lower_oldsize, lower_newsize; |
826 | |
827 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; |
828 | lower_oldsize = upper_size_to_lower_size(crypt_stat, |
829 | upper_size: i_size_read(inode)); |
830 | lower_newsize = upper_size_to_lower_size(crypt_stat, upper_size: offset); |
831 | if (lower_newsize > lower_oldsize) { |
832 | /* |
833 | * The eCryptfs inode and the new *lower* size are mixed here |
834 | * because we may not have the lower i_mutex held and/or it may |
835 | * not be appropriate to call inode_newsize_ok() with inodes |
836 | * from other filesystems. |
837 | */ |
838 | return inode_newsize_ok(inode, offset: lower_newsize); |
839 | } |
840 | |
841 | return 0; |
842 | } |
843 | |
844 | /** |
845 | * ecryptfs_truncate |
846 | * @dentry: The ecryptfs layer dentry |
847 | * @new_length: The length to expand the file to |
848 | * |
849 | * Simple function that handles the truncation of an eCryptfs inode and |
850 | * its corresponding lower inode. |
851 | * |
852 | * Returns zero on success; non-zero otherwise |
853 | */ |
854 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) |
855 | { |
856 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; |
857 | struct iattr lower_ia = { .ia_valid = 0 }; |
858 | int rc; |
859 | |
860 | rc = ecryptfs_inode_newsize_ok(inode: d_inode(dentry), offset: new_length); |
861 | if (rc) |
862 | return rc; |
863 | |
864 | rc = truncate_upper(dentry, ia: &ia, lower_ia: &lower_ia); |
865 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { |
866 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
867 | |
868 | inode_lock(inode: d_inode(dentry: lower_dentry)); |
869 | rc = notify_change(&nop_mnt_idmap, lower_dentry, |
870 | &lower_ia, NULL); |
871 | inode_unlock(inode: d_inode(dentry: lower_dentry)); |
872 | } |
873 | return rc; |
874 | } |
875 | |
876 | static int |
877 | ecryptfs_permission(struct mnt_idmap *idmap, struct inode *inode, |
878 | int mask) |
879 | { |
880 | return inode_permission(&nop_mnt_idmap, |
881 | ecryptfs_inode_to_lower(inode), mask); |
882 | } |
883 | |
884 | /** |
885 | * ecryptfs_setattr |
886 | * @idmap: idmap of the target mount |
887 | * @dentry: dentry handle to the inode to modify |
888 | * @ia: Structure with flags of what to change and values |
889 | * |
890 | * Updates the metadata of an inode. If the update is to the size |
891 | * i.e. truncation, then ecryptfs_truncate will handle the size modification |
892 | * of both the ecryptfs inode and the lower inode. |
893 | * |
894 | * All other metadata changes will be passed right to the lower filesystem, |
895 | * and we will just update our inode to look like the lower. |
896 | */ |
897 | static int ecryptfs_setattr(struct mnt_idmap *idmap, |
898 | struct dentry *dentry, struct iattr *ia) |
899 | { |
900 | int rc = 0; |
901 | struct dentry *lower_dentry; |
902 | struct iattr lower_ia; |
903 | struct inode *inode; |
904 | struct inode *lower_inode; |
905 | struct ecryptfs_crypt_stat *crypt_stat; |
906 | |
907 | crypt_stat = &ecryptfs_inode_to_private(inode: d_inode(dentry))->crypt_stat; |
908 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { |
909 | rc = ecryptfs_init_crypt_stat(crypt_stat); |
910 | if (rc) |
911 | return rc; |
912 | } |
913 | inode = d_inode(dentry); |
914 | lower_inode = ecryptfs_inode_to_lower(inode); |
915 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
916 | mutex_lock(&crypt_stat->cs_mutex); |
917 | if (d_is_dir(dentry)) |
918 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
919 | else if (d_is_reg(dentry) |
920 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
921 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { |
922 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
923 | |
924 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
925 | sb: dentry->d_sb)->mount_crypt_stat; |
926 | rc = ecryptfs_get_lower_file(dentry, inode); |
927 | if (rc) { |
928 | mutex_unlock(lock: &crypt_stat->cs_mutex); |
929 | goto out; |
930 | } |
931 | rc = ecryptfs_read_metadata(ecryptfs_dentry: dentry); |
932 | ecryptfs_put_lower_file(inode); |
933 | if (rc) { |
934 | if (!(mount_crypt_stat->flags |
935 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { |
936 | rc = -EIO; |
937 | printk(KERN_WARNING "Either the lower file " |
938 | "is not in a valid eCryptfs format, " |
939 | "or the key could not be retrieved. " |
940 | "Plaintext passthrough mode is not " |
941 | "enabled; returning -EIO\n" ); |
942 | mutex_unlock(lock: &crypt_stat->cs_mutex); |
943 | goto out; |
944 | } |
945 | rc = 0; |
946 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
947 | | ECRYPTFS_ENCRYPTED); |
948 | } |
949 | } |
950 | mutex_unlock(lock: &crypt_stat->cs_mutex); |
951 | |
952 | rc = setattr_prepare(&nop_mnt_idmap, dentry, ia); |
953 | if (rc) |
954 | goto out; |
955 | if (ia->ia_valid & ATTR_SIZE) { |
956 | rc = ecryptfs_inode_newsize_ok(inode, offset: ia->ia_size); |
957 | if (rc) |
958 | goto out; |
959 | } |
960 | |
961 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
962 | if (ia->ia_valid & ATTR_FILE) |
963 | lower_ia.ia_file = ecryptfs_file_to_lower(file: ia->ia_file); |
964 | if (ia->ia_valid & ATTR_SIZE) { |
965 | rc = truncate_upper(dentry, ia, lower_ia: &lower_ia); |
966 | if (rc < 0) |
967 | goto out; |
968 | } |
969 | |
970 | /* |
971 | * mode change is for clearing setuid/setgid bits. Allow lower fs |
972 | * to interpret this in its own way. |
973 | */ |
974 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
975 | lower_ia.ia_valid &= ~ATTR_MODE; |
976 | |
977 | inode_lock(inode: d_inode(dentry: lower_dentry)); |
978 | rc = notify_change(&nop_mnt_idmap, lower_dentry, &lower_ia, NULL); |
979 | inode_unlock(inode: d_inode(dentry: lower_dentry)); |
980 | out: |
981 | fsstack_copy_attr_all(dest: inode, src: lower_inode); |
982 | return rc; |
983 | } |
984 | |
985 | static int ecryptfs_getattr_link(struct mnt_idmap *idmap, |
986 | const struct path *path, struct kstat *stat, |
987 | u32 request_mask, unsigned int flags) |
988 | { |
989 | struct dentry *dentry = path->dentry; |
990 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
991 | int rc = 0; |
992 | |
993 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
994 | sb: dentry->d_sb)->mount_crypt_stat; |
995 | generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); |
996 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
997 | char *target; |
998 | size_t targetsiz; |
999 | |
1000 | target = ecryptfs_readlink_lower(dentry, bufsiz: &targetsiz); |
1001 | if (!IS_ERR(ptr: target)) { |
1002 | kfree(objp: target); |
1003 | stat->size = targetsiz; |
1004 | } else { |
1005 | rc = PTR_ERR(ptr: target); |
1006 | } |
1007 | } |
1008 | return rc; |
1009 | } |
1010 | |
1011 | static int ecryptfs_do_getattr(const struct path *path, struct kstat *stat, |
1012 | u32 request_mask, unsigned int flags) |
1013 | { |
1014 | if (flags & AT_GETATTR_NOSEC) |
1015 | return vfs_getattr_nosec(path, stat, request_mask, flags); |
1016 | return vfs_getattr(path, stat, request_mask, flags); |
1017 | } |
1018 | |
1019 | static int ecryptfs_getattr(struct mnt_idmap *idmap, |
1020 | const struct path *path, struct kstat *stat, |
1021 | u32 request_mask, unsigned int flags) |
1022 | { |
1023 | struct dentry *dentry = path->dentry; |
1024 | struct kstat lower_stat; |
1025 | int rc; |
1026 | |
1027 | rc = ecryptfs_do_getattr(path: ecryptfs_dentry_to_lower_path(dentry), |
1028 | stat: &lower_stat, request_mask, flags); |
1029 | if (!rc) { |
1030 | fsstack_copy_attr_all(dest: d_inode(dentry), |
1031 | src: ecryptfs_inode_to_lower(inode: d_inode(dentry))); |
1032 | generic_fillattr(&nop_mnt_idmap, request_mask, |
1033 | d_inode(dentry), stat); |
1034 | stat->blocks = lower_stat.blocks; |
1035 | } |
1036 | return rc; |
1037 | } |
1038 | |
1039 | int |
1040 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, |
1041 | const char *name, const void *value, |
1042 | size_t size, int flags) |
1043 | { |
1044 | int rc; |
1045 | struct dentry *lower_dentry; |
1046 | struct inode *lower_inode; |
1047 | |
1048 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
1049 | lower_inode = d_inode(dentry: lower_dentry); |
1050 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
1051 | rc = -EOPNOTSUPP; |
1052 | goto out; |
1053 | } |
1054 | inode_lock(inode: lower_inode); |
1055 | rc = __vfs_setxattr_locked(&nop_mnt_idmap, lower_dentry, name, value, size, flags, NULL); |
1056 | inode_unlock(inode: lower_inode); |
1057 | if (!rc && inode) |
1058 | fsstack_copy_attr_all(dest: inode, src: lower_inode); |
1059 | out: |
1060 | return rc; |
1061 | } |
1062 | |
1063 | ssize_t |
1064 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
1065 | const char *name, void *value, size_t size) |
1066 | { |
1067 | int rc; |
1068 | |
1069 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
1070 | rc = -EOPNOTSUPP; |
1071 | goto out; |
1072 | } |
1073 | inode_lock(inode: lower_inode); |
1074 | rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); |
1075 | inode_unlock(inode: lower_inode); |
1076 | out: |
1077 | return rc; |
1078 | } |
1079 | |
1080 | static ssize_t |
1081 | ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, |
1082 | const char *name, void *value, size_t size) |
1083 | { |
1084 | return ecryptfs_getxattr_lower(lower_dentry: ecryptfs_dentry_to_lower(dentry), |
1085 | lower_inode: ecryptfs_inode_to_lower(inode), |
1086 | name, value, size); |
1087 | } |
1088 | |
1089 | static ssize_t |
1090 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) |
1091 | { |
1092 | int rc = 0; |
1093 | struct dentry *lower_dentry; |
1094 | |
1095 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
1096 | if (!d_inode(dentry: lower_dentry)->i_op->listxattr) { |
1097 | rc = -EOPNOTSUPP; |
1098 | goto out; |
1099 | } |
1100 | inode_lock(inode: d_inode(dentry: lower_dentry)); |
1101 | rc = d_inode(dentry: lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
1102 | inode_unlock(inode: d_inode(dentry: lower_dentry)); |
1103 | out: |
1104 | return rc; |
1105 | } |
1106 | |
1107 | static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, |
1108 | const char *name) |
1109 | { |
1110 | int rc; |
1111 | struct dentry *lower_dentry; |
1112 | struct inode *lower_inode; |
1113 | |
1114 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
1115 | lower_inode = ecryptfs_inode_to_lower(inode); |
1116 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
1117 | rc = -EOPNOTSUPP; |
1118 | goto out; |
1119 | } |
1120 | inode_lock(inode: lower_inode); |
1121 | rc = __vfs_removexattr(&nop_mnt_idmap, lower_dentry, name); |
1122 | inode_unlock(inode: lower_inode); |
1123 | out: |
1124 | return rc; |
1125 | } |
1126 | |
1127 | static int ecryptfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) |
1128 | { |
1129 | return vfs_fileattr_get(dentry: ecryptfs_dentry_to_lower(dentry), fa); |
1130 | } |
1131 | |
1132 | static int ecryptfs_fileattr_set(struct mnt_idmap *idmap, |
1133 | struct dentry *dentry, struct fileattr *fa) |
1134 | { |
1135 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
1136 | int rc; |
1137 | |
1138 | rc = vfs_fileattr_set(idmap: &nop_mnt_idmap, dentry: lower_dentry, fa); |
1139 | fsstack_copy_attr_all(dest: d_inode(dentry), src: d_inode(dentry: lower_dentry)); |
1140 | |
1141 | return rc; |
1142 | } |
1143 | |
1144 | static struct posix_acl *ecryptfs_get_acl(struct mnt_idmap *idmap, |
1145 | struct dentry *dentry, int type) |
1146 | { |
1147 | return vfs_get_acl(idmap, dentry: ecryptfs_dentry_to_lower(dentry), |
1148 | acl_name: posix_acl_xattr_name(type)); |
1149 | } |
1150 | |
1151 | static int ecryptfs_set_acl(struct mnt_idmap *idmap, |
1152 | struct dentry *dentry, struct posix_acl *acl, |
1153 | int type) |
1154 | { |
1155 | int rc; |
1156 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
1157 | struct inode *lower_inode = d_inode(dentry: lower_dentry); |
1158 | |
1159 | rc = vfs_set_acl(idmap: &nop_mnt_idmap, dentry: lower_dentry, |
1160 | acl_name: posix_acl_xattr_name(type), kacl: acl); |
1161 | if (!rc) |
1162 | fsstack_copy_attr_all(dest: d_inode(dentry), src: lower_inode); |
1163 | return rc; |
1164 | } |
1165 | |
1166 | const struct inode_operations ecryptfs_symlink_iops = { |
1167 | .get_link = ecryptfs_get_link, |
1168 | .permission = ecryptfs_permission, |
1169 | .setattr = ecryptfs_setattr, |
1170 | .getattr = ecryptfs_getattr_link, |
1171 | .listxattr = ecryptfs_listxattr, |
1172 | }; |
1173 | |
1174 | const struct inode_operations ecryptfs_dir_iops = { |
1175 | .create = ecryptfs_create, |
1176 | .lookup = ecryptfs_lookup, |
1177 | .link = ecryptfs_link, |
1178 | .unlink = ecryptfs_unlink, |
1179 | .symlink = ecryptfs_symlink, |
1180 | .mkdir = ecryptfs_mkdir, |
1181 | .rmdir = ecryptfs_rmdir, |
1182 | .mknod = ecryptfs_mknod, |
1183 | .rename = ecryptfs_rename, |
1184 | .permission = ecryptfs_permission, |
1185 | .setattr = ecryptfs_setattr, |
1186 | .listxattr = ecryptfs_listxattr, |
1187 | .fileattr_get = ecryptfs_fileattr_get, |
1188 | .fileattr_set = ecryptfs_fileattr_set, |
1189 | .get_acl = ecryptfs_get_acl, |
1190 | .set_acl = ecryptfs_set_acl, |
1191 | }; |
1192 | |
1193 | const struct inode_operations ecryptfs_main_iops = { |
1194 | .permission = ecryptfs_permission, |
1195 | .setattr = ecryptfs_setattr, |
1196 | .getattr = ecryptfs_getattr, |
1197 | .listxattr = ecryptfs_listxattr, |
1198 | .fileattr_get = ecryptfs_fileattr_get, |
1199 | .fileattr_set = ecryptfs_fileattr_set, |
1200 | .get_acl = ecryptfs_get_acl, |
1201 | .set_acl = ecryptfs_set_acl, |
1202 | }; |
1203 | |
1204 | static int ecryptfs_xattr_get(const struct xattr_handler *handler, |
1205 | struct dentry *dentry, struct inode *inode, |
1206 | const char *name, void *buffer, size_t size) |
1207 | { |
1208 | return ecryptfs_getxattr(dentry, inode, name, value: buffer, size); |
1209 | } |
1210 | |
1211 | static int ecryptfs_xattr_set(const struct xattr_handler *handler, |
1212 | struct mnt_idmap *idmap, |
1213 | struct dentry *dentry, struct inode *inode, |
1214 | const char *name, const void *value, size_t size, |
1215 | int flags) |
1216 | { |
1217 | if (value) |
1218 | return ecryptfs_setxattr(dentry, inode, name, value, size, flags); |
1219 | else { |
1220 | BUG_ON(flags != XATTR_REPLACE); |
1221 | return ecryptfs_removexattr(dentry, inode, name); |
1222 | } |
1223 | } |
1224 | |
1225 | static const struct xattr_handler ecryptfs_xattr_handler = { |
1226 | .prefix = "" , /* match anything */ |
1227 | .get = ecryptfs_xattr_get, |
1228 | .set = ecryptfs_xattr_set, |
1229 | }; |
1230 | |
1231 | const struct xattr_handler * const ecryptfs_xattr_handlers[] = { |
1232 | &ecryptfs_xattr_handler, |
1233 | NULL |
1234 | }; |
1235 | |