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1/**
2 * eCryptfs: Linux filesystem encryption layer
3 *
4 * Copyright (C) 1997-2004 Erez Zadok
5 * Copyright (C) 2001-2004 Stony Brook University
6 * Copyright (C) 2004-2007 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8 * Michael C. Thompsion <mcthomps@us.ibm.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of the
13 * License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23 * 02111-1307, USA.
24 */
25
26#include <linux/file.h>
27#include <linux/vmalloc.h>
28#include <linux/pagemap.h>
29#include <linux/dcache.h>
30#include <linux/namei.h>
31#include <linux/mount.h>
32#include <linux/crypto.h>
33#include <linux/fs_stack.h>
34#include <linux/slab.h>
35#include <linux/xattr.h>
36#include <asm/unaligned.h>
37#include "ecryptfs_kernel.h"
38
39static struct dentry *lock_parent(struct dentry *dentry)
40{
41 struct dentry *dir;
42
43 dir = dget_parent(dentry);
44 mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT);
45 return dir;
46}
47
48static void unlock_dir(struct dentry *dir)
49{
50 mutex_unlock(&dir->d_inode->i_mutex);
51 dput(dir);
52}
53
54static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
55{
56 if (ecryptfs_inode_to_lower(inode) == (struct inode *)lower_inode)
57 return 1;
58 return 0;
59}
60
61static int ecryptfs_inode_set(struct inode *inode, void *opaque)
62{
63 struct inode *lower_inode = opaque;
64
65 ecryptfs_set_inode_lower(inode, lower_inode);
66 fsstack_copy_attr_all(inode, lower_inode);
67 /* i_size will be overwritten for encrypted regular files */
68 fsstack_copy_inode_size(inode, lower_inode);
69 inode->i_ino = lower_inode->i_ino;
70 inode->i_version++;
71 inode->i_mapping->a_ops = &ecryptfs_aops;
72 inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi;
73
74 if (S_ISLNK(inode->i_mode))
75 inode->i_op = &ecryptfs_symlink_iops;
76 else if (S_ISDIR(inode->i_mode))
77 inode->i_op = &ecryptfs_dir_iops;
78 else
79 inode->i_op = &ecryptfs_main_iops;
80
81 if (S_ISDIR(inode->i_mode))
82 inode->i_fop = &ecryptfs_dir_fops;
83 else if (special_file(inode->i_mode))
84 init_special_inode(inode, inode->i_mode, inode->i_rdev);
85 else
86 inode->i_fop = &ecryptfs_main_fops;
87
88 return 0;
89}
90
91static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
92 struct super_block *sb)
93{
94 struct inode *inode;
95
96 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
97 return ERR_PTR(-EXDEV);
98 if (!igrab(lower_inode))
99 return ERR_PTR(-ESTALE);
100 inode = iget5_locked(sb, (unsigned long)lower_inode,
101 ecryptfs_inode_test, ecryptfs_inode_set,
102 lower_inode);
103 if (!inode) {
104 iput(lower_inode);
105 return ERR_PTR(-EACCES);
106 }
107 if (!(inode->i_state & I_NEW))
108 iput(lower_inode);
109
110 return inode;
111}
112
113struct inode *ecryptfs_get_inode(struct inode *lower_inode,
114 struct super_block *sb)
115{
116 struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
117
118 if (!IS_ERR(inode) && (inode->i_state & I_NEW))
119 unlock_new_inode(inode);
120
121 return inode;
122}
123
124/**
125 * ecryptfs_interpose
126 * @lower_dentry: Existing dentry in the lower filesystem
127 * @dentry: ecryptfs' dentry
128 * @sb: ecryptfs's super_block
129 *
130 * Interposes upper and lower dentries.
131 *
132 * Returns zero on success; non-zero otherwise
133 */
134static int ecryptfs_interpose(struct dentry *lower_dentry,
135 struct dentry *dentry, struct super_block *sb)
136{
137 struct inode *inode = ecryptfs_get_inode(lower_dentry->d_inode, sb);
138
139 if (IS_ERR(inode))
140 return PTR_ERR(inode);
141 d_instantiate(dentry, inode);
142
143 return 0;
144}
145
146/**
147 * ecryptfs_create_underlying_file
148 * @lower_dir_inode: inode of the parent in the lower fs of the new file
149 * @dentry: New file's dentry
150 * @mode: The mode of the new file
151 *
152 * Creates the file in the lower file system.
153 *
154 * Returns zero on success; non-zero on error condition
155 */
156static int
157ecryptfs_create_underlying_file(struct inode *lower_dir_inode,
158 struct dentry *dentry, int mode)
159{
160 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
161 return vfs_create(lower_dir_inode, lower_dentry, mode, NULL);
162}
163
164/**
165 * ecryptfs_do_create
166 * @directory_inode: inode of the new file's dentry's parent in ecryptfs
167 * @ecryptfs_dentry: New file's dentry in ecryptfs
168 * @mode: The mode of the new file
169 * @nd: nameidata of ecryptfs' parent's dentry & vfsmount
170 *
171 * Creates the underlying file and the eCryptfs inode which will link to
172 * it. It will also update the eCryptfs directory inode to mimic the
173 * stat of the lower directory inode.
174 *
175 * Returns zero on success; non-zero on error condition
176 */
177static int
178ecryptfs_do_create(struct inode *directory_inode,
179 struct dentry *ecryptfs_dentry, int mode)
180{
181 int rc;
182 struct dentry *lower_dentry;
183 struct dentry *lower_dir_dentry;
184
185 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
186 lower_dir_dentry = lock_parent(lower_dentry);
187 if (IS_ERR(lower_dir_dentry)) {
188 ecryptfs_printk(KERN_ERR, "Error locking directory of "
189 "dentry\n");
190 rc = PTR_ERR(lower_dir_dentry);
191 goto out;
192 }
193 rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode,
194 ecryptfs_dentry, mode);
195 if (rc) {
196 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
197 "rc = [%d]\n", __func__, rc);
198 goto out_lock;
199 }
200 rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry,
201 directory_inode->i_sb);
202 if (rc) {
203 ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n");
204 goto out_lock;
205 }
206 fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode);
207 fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode);
208out_lock:
209 unlock_dir(lower_dir_dentry);
210out:
211 return rc;
212}
213
214/**
215 * ecryptfs_initialize_file
216 *
217 * Cause the file to be changed from a basic empty file to an ecryptfs
218 * file with a header and first data page.
219 *
220 * Returns zero on success
221 */
222static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry)
223{
224 struct ecryptfs_crypt_stat *crypt_stat =
225 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
226 int rc = 0;
227
228 if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
229 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
230 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
231 goto out;
232 }
233 ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
234 rc = ecryptfs_new_file_context(ecryptfs_dentry);
235 if (rc) {
236 ecryptfs_printk(KERN_ERR, "Error creating new file "
237 "context; rc = [%d]\n", rc);
238 goto out;
239 }
240 rc = ecryptfs_get_lower_file(ecryptfs_dentry,
241 ecryptfs_dentry->d_inode);
242 if (rc) {
243 printk(KERN_ERR "%s: Error attempting to initialize "
244 "the lower file for the dentry with name "
245 "[%s]; rc = [%d]\n", __func__,
246 ecryptfs_dentry->d_name.name, rc);
247 goto out;
248 }
249 rc = ecryptfs_write_metadata(ecryptfs_dentry);
250 if (rc)
251 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
252 ecryptfs_put_lower_file(ecryptfs_dentry->d_inode);
253out:
254 return rc;
255}
256
257/**
258 * ecryptfs_create
259 * @dir: The inode of the directory in which to create the file.
260 * @dentry: The eCryptfs dentry
261 * @mode: The mode of the new file.
262 * @nd: nameidata
263 *
264 * Creates a new file.
265 *
266 * Returns zero on success; non-zero on error condition
267 */
268static int
269ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
270 int mode, struct nameidata *nd)
271{
272 int rc;
273
274 /* ecryptfs_do_create() calls ecryptfs_interpose() */
275 rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode);
276 if (unlikely(rc)) {
277 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
278 "lower filesystem\n");
279 goto out;
280 }
281 /* At this point, a file exists on "disk"; we need to make sure
282 * that this on disk file is prepared to be an ecryptfs file */
283 rc = ecryptfs_initialize_file(ecryptfs_dentry);
284out:
285 return rc;
286}
287
288static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
289{
290 struct ecryptfs_crypt_stat *crypt_stat;
291 int rc;
292
293 rc = ecryptfs_get_lower_file(dentry, inode);
294 if (rc) {
295 printk(KERN_ERR "%s: Error attempting to initialize "
296 "the lower file for the dentry with name "
297 "[%s]; rc = [%d]\n", __func__,
298 dentry->d_name.name, rc);
299 return rc;
300 }
301
302 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
303 /* TODO: lock for crypt_stat comparison */
304 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
305 ecryptfs_set_default_sizes(crypt_stat);
306
307 rc = ecryptfs_read_and_validate_header_region(inode);
308 ecryptfs_put_lower_file(inode);
309 if (rc) {
310 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
311 if (!rc)
312 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
313 }
314
315 /* Must return 0 to allow non-eCryptfs files to be looked up, too */
316 return 0;
317}
318
319/**
320 * ecryptfs_lookup_interpose - Dentry interposition for a lookup
321 */
322static int ecryptfs_lookup_interpose(struct dentry *dentry,
323 struct dentry *lower_dentry,
324 struct inode *dir_inode)
325{
326 struct inode *inode, *lower_inode = lower_dentry->d_inode;
327 struct ecryptfs_dentry_info *dentry_info;
328 struct vfsmount *lower_mnt;
329 int rc = 0;
330
331 lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent));
332 fsstack_copy_attr_atime(dir_inode, lower_dentry->d_parent->d_inode);
333 BUG_ON(!lower_dentry->d_count);
334
335 dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
336 ecryptfs_set_dentry_private(dentry, dentry_info);
337 if (!dentry_info) {
338 printk(KERN_ERR "%s: Out of memory whilst attempting "
339 "to allocate ecryptfs_dentry_info struct\n",
340 __func__);
341 dput(lower_dentry);
342 mntput(lower_mnt);
343 d_drop(dentry);
344 return -ENOMEM;
345 }
346 ecryptfs_set_dentry_lower(dentry, lower_dentry);
347 ecryptfs_set_dentry_lower_mnt(dentry, lower_mnt);
348
349 if (!lower_dentry->d_inode) {
350 /* We want to add because we couldn't find in lower */
351 d_add(dentry, NULL);
352 return 0;
353 }
354 inode = __ecryptfs_get_inode(lower_inode, dir_inode->i_sb);
355 if (IS_ERR(inode)) {
356 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
357 __func__, PTR_ERR(inode));
358 return PTR_ERR(inode);
359 }
360 if (S_ISREG(inode->i_mode)) {
361 rc = ecryptfs_i_size_read(dentry, inode);
362 if (rc) {
363 make_bad_inode(inode);
364 return rc;
365 }
366 }
367
368 if (inode->i_state & I_NEW)
369 unlock_new_inode(inode);
370 d_add(dentry, inode);
371
372 return rc;
373}
374
375/**
376 * ecryptfs_lookup
377 * @ecryptfs_dir_inode: The eCryptfs directory inode
378 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
379 * @ecryptfs_nd: nameidata; may be NULL
380 *
381 * Find a file on disk. If the file does not exist, then we'll add it to the
382 * dentry cache and continue on to read it from the disk.
383 */
384static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
385 struct dentry *ecryptfs_dentry,
386 struct nameidata *ecryptfs_nd)
387{
388 char *encrypted_and_encoded_name = NULL;
389 size_t encrypted_and_encoded_name_size;
390 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
391 struct dentry *lower_dir_dentry, *lower_dentry;
392 int rc = 0;
393
394 if ((ecryptfs_dentry->d_name.len == 1
395 && !strcmp(ecryptfs_dentry->d_name.name, "."))
396 || (ecryptfs_dentry->d_name.len == 2
397 && !strcmp(ecryptfs_dentry->d_name.name, ".."))) {
398 goto out_d_drop;
399 }
400 lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
401 mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
402 lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name,
403 lower_dir_dentry,
404 ecryptfs_dentry->d_name.len);
405 mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
406 if (IS_ERR(lower_dentry)) {
407 rc = PTR_ERR(lower_dentry);
408 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
409 "[%d] on lower_dentry = [%s]\n", __func__, rc,
410 encrypted_and_encoded_name);
411 goto out_d_drop;
412 }
413 if (lower_dentry->d_inode)
414 goto interpose;
415 mount_crypt_stat = &ecryptfs_superblock_to_private(
416 ecryptfs_dentry->d_sb)->mount_crypt_stat;
417 if (!(mount_crypt_stat
418 && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)))
419 goto interpose;
420 dput(lower_dentry);
421 rc = ecryptfs_encrypt_and_encode_filename(
422 &encrypted_and_encoded_name, &encrypted_and_encoded_name_size,
423 NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name,
424 ecryptfs_dentry->d_name.len);
425 if (rc) {
426 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
427 "filename; rc = [%d]\n", __func__, rc);
428 goto out_d_drop;
429 }
430 mutex_lock(&lower_dir_dentry->d_inode->i_mutex);
431 lower_dentry = lookup_one_len(encrypted_and_encoded_name,
432 lower_dir_dentry,
433 encrypted_and_encoded_name_size);
434 mutex_unlock(&lower_dir_dentry->d_inode->i_mutex);
435 if (IS_ERR(lower_dentry)) {
436 rc = PTR_ERR(lower_dentry);
437 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
438 "[%d] on lower_dentry = [%s]\n", __func__, rc,
439 encrypted_and_encoded_name);
440 goto out_d_drop;
441 }
442interpose:
443 rc = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry,
444 ecryptfs_dir_inode);
445 goto out;
446out_d_drop:
447 d_drop(ecryptfs_dentry);
448out:
449 kfree(encrypted_and_encoded_name);
450 return ERR_PTR(rc);
451}
452
453static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
454 struct dentry *new_dentry)
455{
456 struct dentry *lower_old_dentry;
457 struct dentry *lower_new_dentry;
458 struct dentry *lower_dir_dentry;
459 u64 file_size_save;
460 int rc;
461
462 file_size_save = i_size_read(old_dentry->d_inode);
463 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
464 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
465 dget(lower_old_dentry);
466 dget(lower_new_dentry);
467 lower_dir_dentry = lock_parent(lower_new_dentry);
468 rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode,
469 lower_new_dentry);
470 if (rc || !lower_new_dentry->d_inode)
471 goto out_lock;
472 rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
473 if (rc)
474 goto out_lock;
475 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
476 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
477 old_dentry->d_inode->i_nlink =
478 ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink;
479 i_size_write(new_dentry->d_inode, file_size_save);
480out_lock:
481 unlock_dir(lower_dir_dentry);
482 dput(lower_new_dentry);
483 dput(lower_old_dentry);
484 return rc;
485}
486
487static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
488{
489 int rc = 0;
490 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
491 struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir);
492 struct dentry *lower_dir_dentry;
493
494 dget(lower_dentry);
495 lower_dir_dentry = lock_parent(lower_dentry);
496 rc = vfs_unlink(lower_dir_inode, lower_dentry);
497 if (rc) {
498 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
499 goto out_unlock;
500 }
501 fsstack_copy_attr_times(dir, lower_dir_inode);
502 dentry->d_inode->i_nlink =
503 ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink;
504 dentry->d_inode->i_ctime = dir->i_ctime;
505 d_drop(dentry);
506out_unlock:
507 unlock_dir(lower_dir_dentry);
508 dput(lower_dentry);
509 return rc;
510}
511
512static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
513 const char *symname)
514{
515 int rc;
516 struct dentry *lower_dentry;
517 struct dentry *lower_dir_dentry;
518 char *encoded_symname;
519 size_t encoded_symlen;
520 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
521
522 lower_dentry = ecryptfs_dentry_to_lower(dentry);
523 dget(lower_dentry);
524 lower_dir_dentry = lock_parent(lower_dentry);
525 mount_crypt_stat = &ecryptfs_superblock_to_private(
526 dir->i_sb)->mount_crypt_stat;
527 rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
528 &encoded_symlen,
529 NULL,
530 mount_crypt_stat, symname,
531 strlen(symname));
532 if (rc)
533 goto out_lock;
534 rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry,
535 encoded_symname);
536 kfree(encoded_symname);
537 if (rc || !lower_dentry->d_inode)
538 goto out_lock;
539 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
540 if (rc)
541 goto out_lock;
542 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
543 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
544out_lock:
545 unlock_dir(lower_dir_dentry);
546 dput(lower_dentry);
547 if (!dentry->d_inode)
548 d_drop(dentry);
549 return rc;
550}
551
552static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
553{
554 int rc;
555 struct dentry *lower_dentry;
556 struct dentry *lower_dir_dentry;
557
558 lower_dentry = ecryptfs_dentry_to_lower(dentry);
559 lower_dir_dentry = lock_parent(lower_dentry);
560 rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode);
561 if (rc || !lower_dentry->d_inode)
562 goto out;
563 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
564 if (rc)
565 goto out;
566 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
567 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
568 dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
569out:
570 unlock_dir(lower_dir_dentry);
571 if (!dentry->d_inode)
572 d_drop(dentry);
573 return rc;
574}
575
576static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
577{
578 struct dentry *lower_dentry;
579 struct dentry *lower_dir_dentry;
580 int rc;
581
582 lower_dentry = ecryptfs_dentry_to_lower(dentry);
583 dget(dentry);
584 lower_dir_dentry = lock_parent(lower_dentry);
585 dget(lower_dentry);
586 rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry);
587 dput(lower_dentry);
588 if (!rc && dentry->d_inode)
589 clear_nlink(dentry->d_inode);
590 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
591 dir->i_nlink = lower_dir_dentry->d_inode->i_nlink;
592 unlock_dir(lower_dir_dentry);
593 if (!rc)
594 d_drop(dentry);
595 dput(dentry);
596 return rc;
597}
598
599static int
600ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
601{
602 int rc;
603 struct dentry *lower_dentry;
604 struct dentry *lower_dir_dentry;
605
606 lower_dentry = ecryptfs_dentry_to_lower(dentry);
607 lower_dir_dentry = lock_parent(lower_dentry);
608 rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev);
609 if (rc || !lower_dentry->d_inode)
610 goto out;
611 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
612 if (rc)
613 goto out;
614 fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode);
615 fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode);
616out:
617 unlock_dir(lower_dir_dentry);
618 if (!dentry->d_inode)
619 d_drop(dentry);
620 return rc;
621}
622
623static int
624ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
625 struct inode *new_dir, struct dentry *new_dentry)
626{
627 int rc;
628 struct dentry *lower_old_dentry;
629 struct dentry *lower_new_dentry;
630 struct dentry *lower_old_dir_dentry;
631 struct dentry *lower_new_dir_dentry;
632 struct dentry *trap = NULL;
633
634 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
635 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
636 dget(lower_old_dentry);
637 dget(lower_new_dentry);
638 lower_old_dir_dentry = dget_parent(lower_old_dentry);
639 lower_new_dir_dentry = dget_parent(lower_new_dentry);
640 trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
641 /* source should not be ancestor of target */
642 if (trap == lower_old_dentry) {
643 rc = -EINVAL;
644 goto out_lock;
645 }
646 /* target should not be ancestor of source */
647 if (trap == lower_new_dentry) {
648 rc = -ENOTEMPTY;
649 goto out_lock;
650 }
651 rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry,
652 lower_new_dir_dentry->d_inode, lower_new_dentry);
653 if (rc)
654 goto out_lock;
655 fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode);
656 if (new_dir != old_dir)
657 fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode);
658out_lock:
659 unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
660 dput(lower_new_dir_dentry);
661 dput(lower_old_dir_dentry);
662 dput(lower_new_dentry);
663 dput(lower_old_dentry);
664 return rc;
665}
666
667static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf,
668 size_t *bufsiz)
669{
670 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
671 char *lower_buf;
672 size_t lower_bufsiz = PATH_MAX;
673 mm_segment_t old_fs;
674 int rc;
675
676 lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL);
677 if (!lower_buf) {
678 rc = -ENOMEM;
679 goto out;
680 }
681 old_fs = get_fs();
682 set_fs(get_ds());
683 rc = lower_dentry->d_inode->i_op->readlink(lower_dentry,
684 (char __user *)lower_buf,
685 lower_bufsiz);
686 set_fs(old_fs);
687 if (rc < 0)
688 goto out;
689 lower_bufsiz = rc;
690 rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry,
691 lower_buf, lower_bufsiz);
692out:
693 kfree(lower_buf);
694 return rc;
695}
696
697static int
698ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz)
699{
700 char *kbuf;
701 size_t kbufsiz, copied;
702 int rc;
703
704 rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz);
705 if (rc)
706 goto out;
707 copied = min_t(size_t, bufsiz, kbufsiz);
708 rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied;
709 kfree(kbuf);
710 fsstack_copy_attr_atime(dentry->d_inode,
711 ecryptfs_dentry_to_lower(dentry)->d_inode);
712out:
713 return rc;
714}
715
716static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd)
717{
718 char *buf;
719 int len = PAGE_SIZE, rc;
720 mm_segment_t old_fs;
721
722 /* Released in ecryptfs_put_link(); only release here on error */
723 buf = kmalloc(len, GFP_KERNEL);
724 if (!buf) {
725 buf = ERR_PTR(-ENOMEM);
726 goto out;
727 }
728 old_fs = get_fs();
729 set_fs(get_ds());
730 rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len);
731 set_fs(old_fs);
732 if (rc < 0) {
733 kfree(buf);
734 buf = ERR_PTR(rc);
735 } else
736 buf[rc] = '\0';
737out:
738 nd_set_link(nd, buf);
739 return NULL;
740}
741
742static void
743ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
744{
745 char *buf = nd_get_link(nd);
746 if (!IS_ERR(buf)) {
747 /* Free the char* */
748 kfree(buf);
749 }
750}
751
752/**
753 * upper_size_to_lower_size
754 * @crypt_stat: Crypt_stat associated with file
755 * @upper_size: Size of the upper file
756 *
757 * Calculate the required size of the lower file based on the
758 * specified size of the upper file. This calculation is based on the
759 * number of headers in the underlying file and the extent size.
760 *
761 * Returns Calculated size of the lower file.
762 */
763static loff_t
764upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
765 loff_t upper_size)
766{
767 loff_t lower_size;
768
769 lower_size = ecryptfs_lower_header_size(crypt_stat);
770 if (upper_size != 0) {
771 loff_t num_extents;
772
773 num_extents = upper_size >> crypt_stat->extent_shift;
774 if (upper_size & ~crypt_stat->extent_mask)
775 num_extents++;
776 lower_size += (num_extents * crypt_stat->extent_size);
777 }
778 return lower_size;
779}
780
781/**
782 * truncate_upper
783 * @dentry: The ecryptfs layer dentry
784 * @ia: Address of the ecryptfs inode's attributes
785 * @lower_ia: Address of the lower inode's attributes
786 *
787 * Function to handle truncations modifying the size of the file. Note
788 * that the file sizes are interpolated. When expanding, we are simply
789 * writing strings of 0's out. When truncating, we truncate the upper
790 * inode and update the lower_ia according to the page index
791 * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
792 * the caller must use lower_ia in a call to notify_change() to perform
793 * the truncation of the lower inode.
794 *
795 * Returns zero on success; non-zero otherwise
796 */
797static int truncate_upper(struct dentry *dentry, struct iattr *ia,
798 struct iattr *lower_ia)
799{
800 int rc = 0;
801 struct inode *inode = dentry->d_inode;
802 struct ecryptfs_crypt_stat *crypt_stat;
803 loff_t i_size = i_size_read(inode);
804 loff_t lower_size_before_truncate;
805 loff_t lower_size_after_truncate;
806
807 if (unlikely((ia->ia_size == i_size))) {
808 lower_ia->ia_valid &= ~ATTR_SIZE;
809 return 0;
810 }
811 rc = ecryptfs_get_lower_file(dentry, inode);
812 if (rc)
813 return rc;
814 crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
815 /* Switch on growing or shrinking file */
816 if (ia->ia_size > i_size) {
817 char zero[] = { 0x00 };
818
819 lower_ia->ia_valid &= ~ATTR_SIZE;
820 /* Write a single 0 at the last position of the file;
821 * this triggers code that will fill in 0's throughout
822 * the intermediate portion of the previous end of the
823 * file and the new and of the file */
824 rc = ecryptfs_write(inode, zero,
825 (ia->ia_size - 1), 1);
826 } else { /* ia->ia_size < i_size_read(inode) */
827 /* We're chopping off all the pages down to the page
828 * in which ia->ia_size is located. Fill in the end of
829 * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to
830 * PAGE_CACHE_SIZE with zeros. */
831 size_t num_zeros = (PAGE_CACHE_SIZE
832 - (ia->ia_size & ~PAGE_CACHE_MASK));
833
834
835 /*
836 * XXX(truncate) this should really happen at the begginning
837 * of ->setattr. But the code is too messy to that as part
838 * of a larger patch. ecryptfs is also totally missing out
839 * on the inode_change_ok check at the beginning of
840 * ->setattr while would include this.
841 */
842 rc = inode_newsize_ok(inode, ia->ia_size);
843 if (rc)
844 goto out;
845
846 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
847 truncate_setsize(inode, ia->ia_size);
848 lower_ia->ia_size = ia->ia_size;
849 lower_ia->ia_valid |= ATTR_SIZE;
850 goto out;
851 }
852 if (num_zeros) {
853 char *zeros_virt;
854
855 zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
856 if (!zeros_virt) {
857 rc = -ENOMEM;
858 goto out;
859 }
860 rc = ecryptfs_write(inode, zeros_virt,
861 ia->ia_size, num_zeros);
862 kfree(zeros_virt);
863 if (rc) {
864 printk(KERN_ERR "Error attempting to zero out "
865 "the remainder of the end page on "
866 "reducing truncate; rc = [%d]\n", rc);
867 goto out;
868 }
869 }
870 truncate_setsize(inode, ia->ia_size);
871 rc = ecryptfs_write_inode_size_to_metadata(inode);
872 if (rc) {
873 printk(KERN_ERR "Problem with "
874 "ecryptfs_write_inode_size_to_metadata; "
875 "rc = [%d]\n", rc);
876 goto out;
877 }
878 /* We are reducing the size of the ecryptfs file, and need to
879 * know if we need to reduce the size of the lower file. */
880 lower_size_before_truncate =
881 upper_size_to_lower_size(crypt_stat, i_size);
882 lower_size_after_truncate =
883 upper_size_to_lower_size(crypt_stat, ia->ia_size);
884 if (lower_size_after_truncate < lower_size_before_truncate) {
885 lower_ia->ia_size = lower_size_after_truncate;
886 lower_ia->ia_valid |= ATTR_SIZE;
887 } else
888 lower_ia->ia_valid &= ~ATTR_SIZE;
889 }
890out:
891 ecryptfs_put_lower_file(inode);
892 return rc;
893}
894
895/**
896 * ecryptfs_truncate
897 * @dentry: The ecryptfs layer dentry
898 * @new_length: The length to expand the file to
899 *
900 * Simple function that handles the truncation of an eCryptfs inode and
901 * its corresponding lower inode.
902 *
903 * Returns zero on success; non-zero otherwise
904 */
905int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
906{
907 struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
908 struct iattr lower_ia = { .ia_valid = 0 };
909 int rc;
910
911 rc = truncate_upper(dentry, &ia, &lower_ia);
912 if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
913 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
914
915 mutex_lock(&lower_dentry->d_inode->i_mutex);
916 rc = notify_change(lower_dentry, &lower_ia);
917 mutex_unlock(&lower_dentry->d_inode->i_mutex);
918 }
919 return rc;
920}
921
922static int
923ecryptfs_permission(struct inode *inode, int mask)
924{
925 return inode_permission(ecryptfs_inode_to_lower(inode), mask);
926}
927
928/**
929 * ecryptfs_setattr
930 * @dentry: dentry handle to the inode to modify
931 * @ia: Structure with flags of what to change and values
932 *
933 * Updates the metadata of an inode. If the update is to the size
934 * i.e. truncation, then ecryptfs_truncate will handle the size modification
935 * of both the ecryptfs inode and the lower inode.
936 *
937 * All other metadata changes will be passed right to the lower filesystem,
938 * and we will just update our inode to look like the lower.
939 */
940static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
941{
942 int rc = 0;
943 struct dentry *lower_dentry;
944 struct iattr lower_ia;
945 struct inode *inode;
946 struct inode *lower_inode;
947 struct ecryptfs_crypt_stat *crypt_stat;
948
949 crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
950 if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
951 ecryptfs_init_crypt_stat(crypt_stat);
952 inode = dentry->d_inode;
953 lower_inode = ecryptfs_inode_to_lower(inode);
954 lower_dentry = ecryptfs_dentry_to_lower(dentry);
955 mutex_lock(&crypt_stat->cs_mutex);
956 if (S_ISDIR(dentry->d_inode->i_mode))
957 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
958 else if (S_ISREG(dentry->d_inode->i_mode)
959 && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
960 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
961 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
962
963 mount_crypt_stat = &ecryptfs_superblock_to_private(
964 dentry->d_sb)->mount_crypt_stat;
965 rc = ecryptfs_get_lower_file(dentry, inode);
966 if (rc) {
967 mutex_unlock(&crypt_stat->cs_mutex);
968 goto out;
969 }
970 rc = ecryptfs_read_metadata(dentry);
971 ecryptfs_put_lower_file(inode);
972 if (rc) {
973 if (!(mount_crypt_stat->flags
974 & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
975 rc = -EIO;
976 printk(KERN_WARNING "Either the lower file "
977 "is not in a valid eCryptfs format, "
978 "or the key could not be retrieved. "
979 "Plaintext passthrough mode is not "
980 "enabled; returning -EIO\n");
981 mutex_unlock(&crypt_stat->cs_mutex);
982 goto out;
983 }
984 rc = 0;
985 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
986 | ECRYPTFS_ENCRYPTED);
987 }
988 }
989 mutex_unlock(&crypt_stat->cs_mutex);
990 if (S_ISREG(inode->i_mode)) {
991 rc = filemap_write_and_wait(inode->i_mapping);
992 if (rc)
993 goto out;
994 fsstack_copy_attr_all(inode, lower_inode);
995 }
996 memcpy(&lower_ia, ia, sizeof(lower_ia));
997 if (ia->ia_valid & ATTR_FILE)
998 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
999 if (ia->ia_valid & ATTR_SIZE) {
1000 rc = truncate_upper(dentry, ia, &lower_ia);
1001 if (rc < 0)
1002 goto out;
1003 }
1004
1005 /*
1006 * mode change is for clearing setuid/setgid bits. Allow lower fs
1007 * to interpret this in its own way.
1008 */
1009 if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
1010 lower_ia.ia_valid &= ~ATTR_MODE;
1011
1012 mutex_lock(&lower_dentry->d_inode->i_mutex);
1013 rc = notify_change(lower_dentry, &lower_ia);
1014 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1015out:
1016 fsstack_copy_attr_all(inode, lower_inode);
1017 return rc;
1018}
1019
1020int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry,
1021 struct kstat *stat)
1022{
1023 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
1024 int rc = 0;
1025
1026 mount_crypt_stat = &ecryptfs_superblock_to_private(
1027 dentry->d_sb)->mount_crypt_stat;
1028 generic_fillattr(dentry->d_inode, stat);
1029 if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
1030 char *target;
1031 size_t targetsiz;
1032
1033 rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz);
1034 if (!rc) {
1035 kfree(target);
1036 stat->size = targetsiz;
1037 }
1038 }
1039 return rc;
1040}
1041
1042int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
1043 struct kstat *stat)
1044{
1045 struct kstat lower_stat;
1046 int rc;
1047
1048 rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry),
1049 ecryptfs_dentry_to_lower(dentry), &lower_stat);
1050 if (!rc) {
1051 fsstack_copy_attr_all(dentry->d_inode,
1052 ecryptfs_inode_to_lower(dentry->d_inode));
1053 generic_fillattr(dentry->d_inode, stat);
1054 stat->blocks = lower_stat.blocks;
1055 }
1056 return rc;
1057}
1058
1059int
1060ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value,
1061 size_t size, int flags)
1062{
1063 int rc = 0;
1064 struct dentry *lower_dentry;
1065
1066 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1067 if (!lower_dentry->d_inode->i_op->setxattr) {
1068 rc = -EOPNOTSUPP;
1069 goto out;
1070 }
1071
1072 rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1073out:
1074 return rc;
1075}
1076
1077ssize_t
1078ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name,
1079 void *value, size_t size)
1080{
1081 int rc = 0;
1082
1083 if (!lower_dentry->d_inode->i_op->getxattr) {
1084 rc = -EOPNOTSUPP;
1085 goto out;
1086 }
1087 mutex_lock(&lower_dentry->d_inode->i_mutex);
1088 rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value,
1089 size);
1090 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1091out:
1092 return rc;
1093}
1094
1095static ssize_t
1096ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value,
1097 size_t size)
1098{
1099 return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name,
1100 value, size);
1101}
1102
1103static ssize_t
1104ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1105{
1106 int rc = 0;
1107 struct dentry *lower_dentry;
1108
1109 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1110 if (!lower_dentry->d_inode->i_op->listxattr) {
1111 rc = -EOPNOTSUPP;
1112 goto out;
1113 }
1114 mutex_lock(&lower_dentry->d_inode->i_mutex);
1115 rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size);
1116 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1117out:
1118 return rc;
1119}
1120
1121static int ecryptfs_removexattr(struct dentry *dentry, const char *name)
1122{
1123 int rc = 0;
1124 struct dentry *lower_dentry;
1125
1126 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1127 if (!lower_dentry->d_inode->i_op->removexattr) {
1128 rc = -EOPNOTSUPP;
1129 goto out;
1130 }
1131 mutex_lock(&lower_dentry->d_inode->i_mutex);
1132 rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name);
1133 mutex_unlock(&lower_dentry->d_inode->i_mutex);
1134out:
1135 return rc;
1136}
1137
1138const struct inode_operations ecryptfs_symlink_iops = {
1139 .readlink = ecryptfs_readlink,
1140 .follow_link = ecryptfs_follow_link,
1141 .put_link = ecryptfs_put_link,
1142 .permission = ecryptfs_permission,
1143 .setattr = ecryptfs_setattr,
1144 .getattr = ecryptfs_getattr_link,
1145 .setxattr = ecryptfs_setxattr,
1146 .getxattr = ecryptfs_getxattr,
1147 .listxattr = ecryptfs_listxattr,
1148 .removexattr = ecryptfs_removexattr
1149};
1150
1151const struct inode_operations ecryptfs_dir_iops = {
1152 .create = ecryptfs_create,
1153 .lookup = ecryptfs_lookup,
1154 .link = ecryptfs_link,
1155 .unlink = ecryptfs_unlink,
1156 .symlink = ecryptfs_symlink,
1157 .mkdir = ecryptfs_mkdir,
1158 .rmdir = ecryptfs_rmdir,
1159 .mknod = ecryptfs_mknod,
1160 .rename = ecryptfs_rename,
1161 .permission = ecryptfs_permission,
1162 .setattr = ecryptfs_setattr,
1163 .setxattr = ecryptfs_setxattr,
1164 .getxattr = ecryptfs_getxattr,
1165 .listxattr = ecryptfs_listxattr,
1166 .removexattr = ecryptfs_removexattr
1167};
1168
1169const struct inode_operations ecryptfs_main_iops = {
1170 .permission = ecryptfs_permission,
1171 .setattr = ecryptfs_setattr,
1172 .getattr = ecryptfs_getattr,
1173 .setxattr = ecryptfs_setxattr,
1174 .getxattr = ecryptfs_getxattr,
1175 .listxattr = ecryptfs_listxattr,
1176 .removexattr = ecryptfs_removexattr
1177};
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 <asm/unaligned.h>
22#include "ecryptfs_kernel.h"
23
24static struct dentry *lock_parent(struct dentry *dentry)
25{
26 struct dentry *dir;
27
28 dir = dget_parent(dentry);
29 inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
30 return dir;
31}
32
33static void unlock_dir(struct dentry *dir)
34{
35 inode_unlock(d_inode(dir));
36 dput(dir);
37}
38
39static int ecryptfs_inode_test(struct inode *inode, void *lower_inode)
40{
41 return ecryptfs_inode_to_lower(inode) == lower_inode;
42}
43
44static int ecryptfs_inode_set(struct inode *inode, void *opaque)
45{
46 struct inode *lower_inode = opaque;
47
48 ecryptfs_set_inode_lower(inode, lower_inode);
49 fsstack_copy_attr_all(inode, lower_inode);
50 /* i_size will be overwritten for encrypted regular files */
51 fsstack_copy_inode_size(inode, lower_inode);
52 inode->i_ino = lower_inode->i_ino;
53 inode->i_mapping->a_ops = &ecryptfs_aops;
54
55 if (S_ISLNK(inode->i_mode))
56 inode->i_op = &ecryptfs_symlink_iops;
57 else if (S_ISDIR(inode->i_mode))
58 inode->i_op = &ecryptfs_dir_iops;
59 else
60 inode->i_op = &ecryptfs_main_iops;
61
62 if (S_ISDIR(inode->i_mode))
63 inode->i_fop = &ecryptfs_dir_fops;
64 else if (special_file(inode->i_mode))
65 init_special_inode(inode, inode->i_mode, inode->i_rdev);
66 else
67 inode->i_fop = &ecryptfs_main_fops;
68
69 return 0;
70}
71
72static struct inode *__ecryptfs_get_inode(struct inode *lower_inode,
73 struct super_block *sb)
74{
75 struct inode *inode;
76
77 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb))
78 return ERR_PTR(-EXDEV);
79 if (!igrab(lower_inode))
80 return ERR_PTR(-ESTALE);
81 inode = iget5_locked(sb, (unsigned long)lower_inode,
82 ecryptfs_inode_test, ecryptfs_inode_set,
83 lower_inode);
84 if (!inode) {
85 iput(lower_inode);
86 return ERR_PTR(-EACCES);
87 }
88 if (!(inode->i_state & I_NEW))
89 iput(lower_inode);
90
91 return inode;
92}
93
94struct inode *ecryptfs_get_inode(struct inode *lower_inode,
95 struct super_block *sb)
96{
97 struct inode *inode = __ecryptfs_get_inode(lower_inode, sb);
98
99 if (!IS_ERR(inode) && (inode->i_state & I_NEW))
100 unlock_new_inode(inode);
101
102 return inode;
103}
104
105/**
106 * ecryptfs_interpose
107 * @lower_dentry: Existing dentry in the lower filesystem
108 * @dentry: ecryptfs' dentry
109 * @sb: ecryptfs's super_block
110 *
111 * Interposes upper and lower dentries.
112 *
113 * Returns zero on success; non-zero otherwise
114 */
115static int ecryptfs_interpose(struct dentry *lower_dentry,
116 struct dentry *dentry, struct super_block *sb)
117{
118 struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb);
119
120 if (IS_ERR(inode))
121 return PTR_ERR(inode);
122 d_instantiate(dentry, inode);
123
124 return 0;
125}
126
127static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry,
128 struct inode *inode)
129{
130 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
131 struct dentry *lower_dir_dentry;
132 struct inode *lower_dir_inode;
133 int rc;
134
135 lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
136 lower_dir_inode = d_inode(lower_dir_dentry);
137 inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
138 dget(lower_dentry); // don't even try to make the lower negative
139 if (lower_dentry->d_parent != lower_dir_dentry)
140 rc = -EINVAL;
141 else if (d_unhashed(lower_dentry))
142 rc = -EINVAL;
143 else
144 rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL);
145 if (rc) {
146 printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc);
147 goto out_unlock;
148 }
149 fsstack_copy_attr_times(dir, lower_dir_inode);
150 set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink);
151 inode->i_ctime = dir->i_ctime;
152out_unlock:
153 dput(lower_dentry);
154 inode_unlock(lower_dir_inode);
155 if (!rc)
156 d_drop(dentry);
157 return rc;
158}
159
160/**
161 * ecryptfs_do_create
162 * @directory_inode: inode of the new file's dentry's parent in ecryptfs
163 * @ecryptfs_dentry: New file's dentry in ecryptfs
164 * @mode: The mode of the new file
165 *
166 * Creates the underlying file and the eCryptfs inode which will link to
167 * it. It will also update the eCryptfs directory inode to mimic the
168 * stat of the lower directory inode.
169 *
170 * Returns the new eCryptfs inode on success; an ERR_PTR on error condition
171 */
172static struct inode *
173ecryptfs_do_create(struct inode *directory_inode,
174 struct dentry *ecryptfs_dentry, umode_t mode)
175{
176 int rc;
177 struct dentry *lower_dentry;
178 struct dentry *lower_dir_dentry;
179 struct inode *inode;
180
181 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
182 lower_dir_dentry = lock_parent(lower_dentry);
183 rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true);
184 if (rc) {
185 printk(KERN_ERR "%s: Failure to create dentry in lower fs; "
186 "rc = [%d]\n", __func__, rc);
187 inode = ERR_PTR(rc);
188 goto out_lock;
189 }
190 inode = __ecryptfs_get_inode(d_inode(lower_dentry),
191 directory_inode->i_sb);
192 if (IS_ERR(inode)) {
193 vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL);
194 goto out_lock;
195 }
196 fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry));
197 fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry));
198out_lock:
199 unlock_dir(lower_dir_dentry);
200 return inode;
201}
202
203/**
204 * ecryptfs_initialize_file
205 *
206 * Cause the file to be changed from a basic empty file to an ecryptfs
207 * file with a header and first data page.
208 *
209 * Returns zero on success
210 */
211int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry,
212 struct inode *ecryptfs_inode)
213{
214 struct ecryptfs_crypt_stat *crypt_stat =
215 &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
216 int rc = 0;
217
218 if (S_ISDIR(ecryptfs_inode->i_mode)) {
219 ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
220 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
221 goto out;
222 }
223 ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n");
224 rc = ecryptfs_new_file_context(ecryptfs_inode);
225 if (rc) {
226 ecryptfs_printk(KERN_ERR, "Error creating new file "
227 "context; rc = [%d]\n", rc);
228 goto out;
229 }
230 rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode);
231 if (rc) {
232 printk(KERN_ERR "%s: Error attempting to initialize "
233 "the lower file for the dentry with name "
234 "[%pd]; rc = [%d]\n", __func__,
235 ecryptfs_dentry, rc);
236 goto out;
237 }
238 rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode);
239 if (rc)
240 printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc);
241 ecryptfs_put_lower_file(ecryptfs_inode);
242out:
243 return rc;
244}
245
246/**
247 * ecryptfs_create
248 * @dir: The inode of the directory in which to create the file.
249 * @dentry: The eCryptfs dentry
250 * @mode: The mode of the new file.
251 *
252 * Creates a new file.
253 *
254 * Returns zero on success; non-zero on error condition
255 */
256static int
257ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry,
258 umode_t mode, bool excl)
259{
260 struct inode *ecryptfs_inode;
261 int rc;
262
263 ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry,
264 mode);
265 if (IS_ERR(ecryptfs_inode)) {
266 ecryptfs_printk(KERN_WARNING, "Failed to create file in"
267 "lower filesystem\n");
268 rc = PTR_ERR(ecryptfs_inode);
269 goto out;
270 }
271 /* At this point, a file exists on "disk"; we need to make sure
272 * that this on disk file is prepared to be an ecryptfs file */
273 rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode);
274 if (rc) {
275 ecryptfs_do_unlink(directory_inode, ecryptfs_dentry,
276 ecryptfs_inode);
277 iget_failed(ecryptfs_inode);
278 goto out;
279 }
280 d_instantiate_new(ecryptfs_dentry, ecryptfs_inode);
281out:
282 return rc;
283}
284
285static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode)
286{
287 struct ecryptfs_crypt_stat *crypt_stat;
288 int rc;
289
290 rc = ecryptfs_get_lower_file(dentry, inode);
291 if (rc) {
292 printk(KERN_ERR "%s: Error attempting to initialize "
293 "the lower file for the dentry with name "
294 "[%pd]; rc = [%d]\n", __func__,
295 dentry, rc);
296 return rc;
297 }
298
299 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
300 /* TODO: lock for crypt_stat comparison */
301 if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED))
302 ecryptfs_set_default_sizes(crypt_stat);
303
304 rc = ecryptfs_read_and_validate_header_region(inode);
305 ecryptfs_put_lower_file(inode);
306 if (rc) {
307 rc = ecryptfs_read_and_validate_xattr_region(dentry, inode);
308 if (!rc)
309 crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR;
310 }
311
312 /* Must return 0 to allow non-eCryptfs files to be looked up, too */
313 return 0;
314}
315
316/**
317 * ecryptfs_lookup_interpose - Dentry interposition for a lookup
318 */
319static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry,
320 struct dentry *lower_dentry)
321{
322 struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent);
323 struct inode *inode, *lower_inode;
324 struct ecryptfs_dentry_info *dentry_info;
325 int rc = 0;
326
327 dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
328 if (!dentry_info) {
329 dput(lower_dentry);
330 return ERR_PTR(-ENOMEM);
331 }
332
333 fsstack_copy_attr_atime(d_inode(dentry->d_parent),
334 d_inode(path->dentry));
335 BUG_ON(!d_count(lower_dentry));
336
337 ecryptfs_set_dentry_private(dentry, dentry_info);
338 dentry_info->lower_path.mnt = mntget(path->mnt);
339 dentry_info->lower_path.dentry = lower_dentry;
340
341 /*
342 * negative dentry can go positive under us here - its parent is not
343 * locked. That's OK and that could happen just as we return from
344 * ecryptfs_lookup() anyway. Just need to be careful and fetch
345 * ->d_inode only once - it's not stable here.
346 */
347 lower_inode = READ_ONCE(lower_dentry->d_inode);
348
349 if (!lower_inode) {
350 /* We want to add because we couldn't find in lower */
351 d_add(dentry, NULL);
352 return NULL;
353 }
354 inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb);
355 if (IS_ERR(inode)) {
356 printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n",
357 __func__, PTR_ERR(inode));
358 return ERR_CAST(inode);
359 }
360 if (S_ISREG(inode->i_mode)) {
361 rc = ecryptfs_i_size_read(dentry, inode);
362 if (rc) {
363 make_bad_inode(inode);
364 return ERR_PTR(rc);
365 }
366 }
367
368 if (inode->i_state & I_NEW)
369 unlock_new_inode(inode);
370 return d_splice_alias(inode, dentry);
371}
372
373/**
374 * ecryptfs_lookup
375 * @ecryptfs_dir_inode: The eCryptfs directory inode
376 * @ecryptfs_dentry: The eCryptfs dentry that we are looking up
377 * @flags: lookup flags
378 *
379 * Find a file on disk. If the file does not exist, then we'll add it to the
380 * dentry cache and continue on to read it from the disk.
381 */
382static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode,
383 struct dentry *ecryptfs_dentry,
384 unsigned int flags)
385{
386 char *encrypted_and_encoded_name = NULL;
387 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
388 struct dentry *lower_dir_dentry, *lower_dentry;
389 const char *name = ecryptfs_dentry->d_name.name;
390 size_t len = ecryptfs_dentry->d_name.len;
391 struct dentry *res;
392 int rc = 0;
393
394 lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent);
395
396 mount_crypt_stat = &ecryptfs_superblock_to_private(
397 ecryptfs_dentry->d_sb)->mount_crypt_stat;
398 if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
399 rc = ecryptfs_encrypt_and_encode_filename(
400 &encrypted_and_encoded_name, &len,
401 mount_crypt_stat, name, len);
402 if (rc) {
403 printk(KERN_ERR "%s: Error attempting to encrypt and encode "
404 "filename; rc = [%d]\n", __func__, rc);
405 return ERR_PTR(rc);
406 }
407 name = encrypted_and_encoded_name;
408 }
409
410 lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len);
411 if (IS_ERR(lower_dentry)) {
412 ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned "
413 "[%ld] on lower_dentry = [%s]\n", __func__,
414 PTR_ERR(lower_dentry),
415 name);
416 res = ERR_CAST(lower_dentry);
417 } else {
418 res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry);
419 }
420 kfree(encrypted_and_encoded_name);
421 return res;
422}
423
424static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir,
425 struct dentry *new_dentry)
426{
427 struct dentry *lower_old_dentry;
428 struct dentry *lower_new_dentry;
429 struct dentry *lower_dir_dentry;
430 u64 file_size_save;
431 int rc;
432
433 file_size_save = i_size_read(d_inode(old_dentry));
434 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
435 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
436 dget(lower_old_dentry);
437 dget(lower_new_dentry);
438 lower_dir_dentry = lock_parent(lower_new_dentry);
439 rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry),
440 lower_new_dentry, NULL);
441 if (rc || d_really_is_negative(lower_new_dentry))
442 goto out_lock;
443 rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb);
444 if (rc)
445 goto out_lock;
446 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
447 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
448 set_nlink(d_inode(old_dentry),
449 ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink);
450 i_size_write(d_inode(new_dentry), file_size_save);
451out_lock:
452 unlock_dir(lower_dir_dentry);
453 dput(lower_new_dentry);
454 dput(lower_old_dentry);
455 return rc;
456}
457
458static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry)
459{
460 return ecryptfs_do_unlink(dir, dentry, d_inode(dentry));
461}
462
463static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry,
464 const char *symname)
465{
466 int rc;
467 struct dentry *lower_dentry;
468 struct dentry *lower_dir_dentry;
469 char *encoded_symname;
470 size_t encoded_symlen;
471 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL;
472
473 lower_dentry = ecryptfs_dentry_to_lower(dentry);
474 dget(lower_dentry);
475 lower_dir_dentry = lock_parent(lower_dentry);
476 mount_crypt_stat = &ecryptfs_superblock_to_private(
477 dir->i_sb)->mount_crypt_stat;
478 rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname,
479 &encoded_symlen,
480 mount_crypt_stat, symname,
481 strlen(symname));
482 if (rc)
483 goto out_lock;
484 rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry,
485 encoded_symname);
486 kfree(encoded_symname);
487 if (rc || d_really_is_negative(lower_dentry))
488 goto out_lock;
489 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
490 if (rc)
491 goto out_lock;
492 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
493 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
494out_lock:
495 unlock_dir(lower_dir_dentry);
496 dput(lower_dentry);
497 if (d_really_is_negative(dentry))
498 d_drop(dentry);
499 return rc;
500}
501
502static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
503{
504 int rc;
505 struct dentry *lower_dentry;
506 struct dentry *lower_dir_dentry;
507
508 lower_dentry = ecryptfs_dentry_to_lower(dentry);
509 lower_dir_dentry = lock_parent(lower_dentry);
510 rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode);
511 if (rc || d_really_is_negative(lower_dentry))
512 goto out;
513 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
514 if (rc)
515 goto out;
516 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
517 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
518 set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink);
519out:
520 unlock_dir(lower_dir_dentry);
521 if (d_really_is_negative(dentry))
522 d_drop(dentry);
523 return rc;
524}
525
526static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry)
527{
528 struct dentry *lower_dentry;
529 struct dentry *lower_dir_dentry;
530 struct inode *lower_dir_inode;
531 int rc;
532
533 lower_dentry = ecryptfs_dentry_to_lower(dentry);
534 lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent);
535 lower_dir_inode = d_inode(lower_dir_dentry);
536
537 inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT);
538 dget(lower_dentry); // don't even try to make the lower negative
539 if (lower_dentry->d_parent != lower_dir_dentry)
540 rc = -EINVAL;
541 else if (d_unhashed(lower_dentry))
542 rc = -EINVAL;
543 else
544 rc = vfs_rmdir(lower_dir_inode, lower_dentry);
545 if (!rc) {
546 clear_nlink(d_inode(dentry));
547 fsstack_copy_attr_times(dir, lower_dir_inode);
548 set_nlink(dir, lower_dir_inode->i_nlink);
549 }
550 dput(lower_dentry);
551 inode_unlock(lower_dir_inode);
552 if (!rc)
553 d_drop(dentry);
554 return rc;
555}
556
557static int
558ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
559{
560 int rc;
561 struct dentry *lower_dentry;
562 struct dentry *lower_dir_dentry;
563
564 lower_dentry = ecryptfs_dentry_to_lower(dentry);
565 lower_dir_dentry = lock_parent(lower_dentry);
566 rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev);
567 if (rc || d_really_is_negative(lower_dentry))
568 goto out;
569 rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb);
570 if (rc)
571 goto out;
572 fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry));
573 fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry));
574out:
575 unlock_dir(lower_dir_dentry);
576 if (d_really_is_negative(dentry))
577 d_drop(dentry);
578 return rc;
579}
580
581static int
582ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry,
583 struct inode *new_dir, struct dentry *new_dentry,
584 unsigned int flags)
585{
586 int rc;
587 struct dentry *lower_old_dentry;
588 struct dentry *lower_new_dentry;
589 struct dentry *lower_old_dir_dentry;
590 struct dentry *lower_new_dir_dentry;
591 struct dentry *trap;
592 struct inode *target_inode;
593
594 if (flags)
595 return -EINVAL;
596
597 lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent);
598 lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent);
599
600 lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry);
601 lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry);
602
603 target_inode = d_inode(new_dentry);
604
605 trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
606 dget(lower_new_dentry);
607 rc = -EINVAL;
608 if (lower_old_dentry->d_parent != lower_old_dir_dentry)
609 goto out_lock;
610 if (lower_new_dentry->d_parent != lower_new_dir_dentry)
611 goto out_lock;
612 if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry))
613 goto out_lock;
614 /* source should not be ancestor of target */
615 if (trap == lower_old_dentry)
616 goto out_lock;
617 /* target should not be ancestor of source */
618 if (trap == lower_new_dentry) {
619 rc = -ENOTEMPTY;
620 goto out_lock;
621 }
622 rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry,
623 d_inode(lower_new_dir_dentry), lower_new_dentry,
624 NULL, 0);
625 if (rc)
626 goto out_lock;
627 if (target_inode)
628 fsstack_copy_attr_all(target_inode,
629 ecryptfs_inode_to_lower(target_inode));
630 fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry));
631 if (new_dir != old_dir)
632 fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry));
633out_lock:
634 dput(lower_new_dentry);
635 unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry);
636 return rc;
637}
638
639static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
640{
641 DEFINE_DELAYED_CALL(done);
642 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
643 const char *link;
644 char *buf;
645 int rc;
646
647 link = vfs_get_link(lower_dentry, &done);
648 if (IS_ERR(link))
649 return ERR_CAST(link);
650
651 rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
652 link, strlen(link));
653 do_delayed_call(&done);
654 if (rc)
655 return ERR_PTR(rc);
656
657 return buf;
658}
659
660static const char *ecryptfs_get_link(struct dentry *dentry,
661 struct inode *inode,
662 struct delayed_call *done)
663{
664 size_t len;
665 char *buf;
666
667 if (!dentry)
668 return ERR_PTR(-ECHILD);
669
670 buf = ecryptfs_readlink_lower(dentry, &len);
671 if (IS_ERR(buf))
672 return buf;
673 fsstack_copy_attr_atime(d_inode(dentry),
674 d_inode(ecryptfs_dentry_to_lower(dentry)));
675 buf[len] = '\0';
676 set_delayed_call(done, kfree_link, buf);
677 return buf;
678}
679
680/**
681 * upper_size_to_lower_size
682 * @crypt_stat: Crypt_stat associated with file
683 * @upper_size: Size of the upper file
684 *
685 * Calculate the required size of the lower file based on the
686 * specified size of the upper file. This calculation is based on the
687 * number of headers in the underlying file and the extent size.
688 *
689 * Returns Calculated size of the lower file.
690 */
691static loff_t
692upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat,
693 loff_t upper_size)
694{
695 loff_t lower_size;
696
697 lower_size = ecryptfs_lower_header_size(crypt_stat);
698 if (upper_size != 0) {
699 loff_t num_extents;
700
701 num_extents = upper_size >> crypt_stat->extent_shift;
702 if (upper_size & ~crypt_stat->extent_mask)
703 num_extents++;
704 lower_size += (num_extents * crypt_stat->extent_size);
705 }
706 return lower_size;
707}
708
709/**
710 * truncate_upper
711 * @dentry: The ecryptfs layer dentry
712 * @ia: Address of the ecryptfs inode's attributes
713 * @lower_ia: Address of the lower inode's attributes
714 *
715 * Function to handle truncations modifying the size of the file. Note
716 * that the file sizes are interpolated. When expanding, we are simply
717 * writing strings of 0's out. When truncating, we truncate the upper
718 * inode and update the lower_ia according to the page index
719 * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return,
720 * the caller must use lower_ia in a call to notify_change() to perform
721 * the truncation of the lower inode.
722 *
723 * Returns zero on success; non-zero otherwise
724 */
725static int truncate_upper(struct dentry *dentry, struct iattr *ia,
726 struct iattr *lower_ia)
727{
728 int rc = 0;
729 struct inode *inode = d_inode(dentry);
730 struct ecryptfs_crypt_stat *crypt_stat;
731 loff_t i_size = i_size_read(inode);
732 loff_t lower_size_before_truncate;
733 loff_t lower_size_after_truncate;
734
735 if (unlikely((ia->ia_size == i_size))) {
736 lower_ia->ia_valid &= ~ATTR_SIZE;
737 return 0;
738 }
739 rc = ecryptfs_get_lower_file(dentry, inode);
740 if (rc)
741 return rc;
742 crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
743 /* Switch on growing or shrinking file */
744 if (ia->ia_size > i_size) {
745 char zero[] = { 0x00 };
746
747 lower_ia->ia_valid &= ~ATTR_SIZE;
748 /* Write a single 0 at the last position of the file;
749 * this triggers code that will fill in 0's throughout
750 * the intermediate portion of the previous end of the
751 * file and the new and of the file */
752 rc = ecryptfs_write(inode, zero,
753 (ia->ia_size - 1), 1);
754 } else { /* ia->ia_size < i_size_read(inode) */
755 /* We're chopping off all the pages down to the page
756 * in which ia->ia_size is located. Fill in the end of
757 * that page from (ia->ia_size & ~PAGE_MASK) to
758 * PAGE_SIZE with zeros. */
759 size_t num_zeros = (PAGE_SIZE
760 - (ia->ia_size & ~PAGE_MASK));
761
762 if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) {
763 truncate_setsize(inode, ia->ia_size);
764 lower_ia->ia_size = ia->ia_size;
765 lower_ia->ia_valid |= ATTR_SIZE;
766 goto out;
767 }
768 if (num_zeros) {
769 char *zeros_virt;
770
771 zeros_virt = kzalloc(num_zeros, GFP_KERNEL);
772 if (!zeros_virt) {
773 rc = -ENOMEM;
774 goto out;
775 }
776 rc = ecryptfs_write(inode, zeros_virt,
777 ia->ia_size, num_zeros);
778 kfree(zeros_virt);
779 if (rc) {
780 printk(KERN_ERR "Error attempting to zero out "
781 "the remainder of the end page on "
782 "reducing truncate; rc = [%d]\n", rc);
783 goto out;
784 }
785 }
786 truncate_setsize(inode, ia->ia_size);
787 rc = ecryptfs_write_inode_size_to_metadata(inode);
788 if (rc) {
789 printk(KERN_ERR "Problem with "
790 "ecryptfs_write_inode_size_to_metadata; "
791 "rc = [%d]\n", rc);
792 goto out;
793 }
794 /* We are reducing the size of the ecryptfs file, and need to
795 * know if we need to reduce the size of the lower file. */
796 lower_size_before_truncate =
797 upper_size_to_lower_size(crypt_stat, i_size);
798 lower_size_after_truncate =
799 upper_size_to_lower_size(crypt_stat, ia->ia_size);
800 if (lower_size_after_truncate < lower_size_before_truncate) {
801 lower_ia->ia_size = lower_size_after_truncate;
802 lower_ia->ia_valid |= ATTR_SIZE;
803 } else
804 lower_ia->ia_valid &= ~ATTR_SIZE;
805 }
806out:
807 ecryptfs_put_lower_file(inode);
808 return rc;
809}
810
811static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset)
812{
813 struct ecryptfs_crypt_stat *crypt_stat;
814 loff_t lower_oldsize, lower_newsize;
815
816 crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
817 lower_oldsize = upper_size_to_lower_size(crypt_stat,
818 i_size_read(inode));
819 lower_newsize = upper_size_to_lower_size(crypt_stat, offset);
820 if (lower_newsize > lower_oldsize) {
821 /*
822 * The eCryptfs inode and the new *lower* size are mixed here
823 * because we may not have the lower i_mutex held and/or it may
824 * not be appropriate to call inode_newsize_ok() with inodes
825 * from other filesystems.
826 */
827 return inode_newsize_ok(inode, lower_newsize);
828 }
829
830 return 0;
831}
832
833/**
834 * ecryptfs_truncate
835 * @dentry: The ecryptfs layer dentry
836 * @new_length: The length to expand the file to
837 *
838 * Simple function that handles the truncation of an eCryptfs inode and
839 * its corresponding lower inode.
840 *
841 * Returns zero on success; non-zero otherwise
842 */
843int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
844{
845 struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length };
846 struct iattr lower_ia = { .ia_valid = 0 };
847 int rc;
848
849 rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length);
850 if (rc)
851 return rc;
852
853 rc = truncate_upper(dentry, &ia, &lower_ia);
854 if (!rc && lower_ia.ia_valid & ATTR_SIZE) {
855 struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
856
857 inode_lock(d_inode(lower_dentry));
858 rc = notify_change(lower_dentry, &lower_ia, NULL);
859 inode_unlock(d_inode(lower_dentry));
860 }
861 return rc;
862}
863
864static int
865ecryptfs_permission(struct inode *inode, int mask)
866{
867 return inode_permission(ecryptfs_inode_to_lower(inode), mask);
868}
869
870/**
871 * ecryptfs_setattr
872 * @dentry: dentry handle to the inode to modify
873 * @ia: Structure with flags of what to change and values
874 *
875 * Updates the metadata of an inode. If the update is to the size
876 * i.e. truncation, then ecryptfs_truncate will handle the size modification
877 * of both the ecryptfs inode and the lower inode.
878 *
879 * All other metadata changes will be passed right to the lower filesystem,
880 * and we will just update our inode to look like the lower.
881 */
882static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
883{
884 int rc = 0;
885 struct dentry *lower_dentry;
886 struct iattr lower_ia;
887 struct inode *inode;
888 struct inode *lower_inode;
889 struct ecryptfs_crypt_stat *crypt_stat;
890
891 crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat;
892 if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) {
893 rc = ecryptfs_init_crypt_stat(crypt_stat);
894 if (rc)
895 return rc;
896 }
897 inode = d_inode(dentry);
898 lower_inode = ecryptfs_inode_to_lower(inode);
899 lower_dentry = ecryptfs_dentry_to_lower(dentry);
900 mutex_lock(&crypt_stat->cs_mutex);
901 if (d_is_dir(dentry))
902 crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
903 else if (d_is_reg(dentry)
904 && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
905 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) {
906 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
907
908 mount_crypt_stat = &ecryptfs_superblock_to_private(
909 dentry->d_sb)->mount_crypt_stat;
910 rc = ecryptfs_get_lower_file(dentry, inode);
911 if (rc) {
912 mutex_unlock(&crypt_stat->cs_mutex);
913 goto out;
914 }
915 rc = ecryptfs_read_metadata(dentry);
916 ecryptfs_put_lower_file(inode);
917 if (rc) {
918 if (!(mount_crypt_stat->flags
919 & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
920 rc = -EIO;
921 printk(KERN_WARNING "Either the lower file "
922 "is not in a valid eCryptfs format, "
923 "or the key could not be retrieved. "
924 "Plaintext passthrough mode is not "
925 "enabled; returning -EIO\n");
926 mutex_unlock(&crypt_stat->cs_mutex);
927 goto out;
928 }
929 rc = 0;
930 crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED
931 | ECRYPTFS_ENCRYPTED);
932 }
933 }
934 mutex_unlock(&crypt_stat->cs_mutex);
935
936 rc = setattr_prepare(dentry, ia);
937 if (rc)
938 goto out;
939 if (ia->ia_valid & ATTR_SIZE) {
940 rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size);
941 if (rc)
942 goto out;
943 }
944
945 memcpy(&lower_ia, ia, sizeof(lower_ia));
946 if (ia->ia_valid & ATTR_FILE)
947 lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file);
948 if (ia->ia_valid & ATTR_SIZE) {
949 rc = truncate_upper(dentry, ia, &lower_ia);
950 if (rc < 0)
951 goto out;
952 }
953
954 /*
955 * mode change is for clearing setuid/setgid bits. Allow lower fs
956 * to interpret this in its own way.
957 */
958 if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
959 lower_ia.ia_valid &= ~ATTR_MODE;
960
961 inode_lock(d_inode(lower_dentry));
962 rc = notify_change(lower_dentry, &lower_ia, NULL);
963 inode_unlock(d_inode(lower_dentry));
964out:
965 fsstack_copy_attr_all(inode, lower_inode);
966 return rc;
967}
968
969static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat,
970 u32 request_mask, unsigned int flags)
971{
972 struct dentry *dentry = path->dentry;
973 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
974 int rc = 0;
975
976 mount_crypt_stat = &ecryptfs_superblock_to_private(
977 dentry->d_sb)->mount_crypt_stat;
978 generic_fillattr(d_inode(dentry), stat);
979 if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) {
980 char *target;
981 size_t targetsiz;
982
983 target = ecryptfs_readlink_lower(dentry, &targetsiz);
984 if (!IS_ERR(target)) {
985 kfree(target);
986 stat->size = targetsiz;
987 } else {
988 rc = PTR_ERR(target);
989 }
990 }
991 return rc;
992}
993
994static int ecryptfs_getattr(const struct path *path, struct kstat *stat,
995 u32 request_mask, unsigned int flags)
996{
997 struct dentry *dentry = path->dentry;
998 struct kstat lower_stat;
999 int rc;
1000
1001 rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat,
1002 request_mask, flags);
1003 if (!rc) {
1004 fsstack_copy_attr_all(d_inode(dentry),
1005 ecryptfs_inode_to_lower(d_inode(dentry)));
1006 generic_fillattr(d_inode(dentry), stat);
1007 stat->blocks = lower_stat.blocks;
1008 }
1009 return rc;
1010}
1011
1012int
1013ecryptfs_setxattr(struct dentry *dentry, struct inode *inode,
1014 const char *name, const void *value,
1015 size_t size, int flags)
1016{
1017 int rc;
1018 struct dentry *lower_dentry;
1019
1020 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1021 if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) {
1022 rc = -EOPNOTSUPP;
1023 goto out;
1024 }
1025 rc = vfs_setxattr(lower_dentry, name, value, size, flags);
1026 if (!rc && inode)
1027 fsstack_copy_attr_all(inode, d_inode(lower_dentry));
1028out:
1029 return rc;
1030}
1031
1032ssize_t
1033ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode,
1034 const char *name, void *value, size_t size)
1035{
1036 int rc;
1037
1038 if (!(lower_inode->i_opflags & IOP_XATTR)) {
1039 rc = -EOPNOTSUPP;
1040 goto out;
1041 }
1042 inode_lock(lower_inode);
1043 rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size);
1044 inode_unlock(lower_inode);
1045out:
1046 return rc;
1047}
1048
1049static ssize_t
1050ecryptfs_getxattr(struct dentry *dentry, struct inode *inode,
1051 const char *name, void *value, size_t size)
1052{
1053 return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry),
1054 ecryptfs_inode_to_lower(inode),
1055 name, value, size);
1056}
1057
1058static ssize_t
1059ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size)
1060{
1061 int rc = 0;
1062 struct dentry *lower_dentry;
1063
1064 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1065 if (!d_inode(lower_dentry)->i_op->listxattr) {
1066 rc = -EOPNOTSUPP;
1067 goto out;
1068 }
1069 inode_lock(d_inode(lower_dentry));
1070 rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size);
1071 inode_unlock(d_inode(lower_dentry));
1072out:
1073 return rc;
1074}
1075
1076static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
1077 const char *name)
1078{
1079 int rc;
1080 struct dentry *lower_dentry;
1081 struct inode *lower_inode;
1082
1083 lower_dentry = ecryptfs_dentry_to_lower(dentry);
1084 lower_inode = ecryptfs_inode_to_lower(inode);
1085 if (!(lower_inode->i_opflags & IOP_XATTR)) {
1086 rc = -EOPNOTSUPP;
1087 goto out;
1088 }
1089 inode_lock(lower_inode);
1090 rc = __vfs_removexattr(lower_dentry, name);
1091 inode_unlock(lower_inode);
1092out:
1093 return rc;
1094}
1095
1096const struct inode_operations ecryptfs_symlink_iops = {
1097 .get_link = ecryptfs_get_link,
1098 .permission = ecryptfs_permission,
1099 .setattr = ecryptfs_setattr,
1100 .getattr = ecryptfs_getattr_link,
1101 .listxattr = ecryptfs_listxattr,
1102};
1103
1104const struct inode_operations ecryptfs_dir_iops = {
1105 .create = ecryptfs_create,
1106 .lookup = ecryptfs_lookup,
1107 .link = ecryptfs_link,
1108 .unlink = ecryptfs_unlink,
1109 .symlink = ecryptfs_symlink,
1110 .mkdir = ecryptfs_mkdir,
1111 .rmdir = ecryptfs_rmdir,
1112 .mknod = ecryptfs_mknod,
1113 .rename = ecryptfs_rename,
1114 .permission = ecryptfs_permission,
1115 .setattr = ecryptfs_setattr,
1116 .listxattr = ecryptfs_listxattr,
1117};
1118
1119const struct inode_operations ecryptfs_main_iops = {
1120 .permission = ecryptfs_permission,
1121 .setattr = ecryptfs_setattr,
1122 .getattr = ecryptfs_getattr,
1123 .listxattr = ecryptfs_listxattr,
1124};
1125
1126static int ecryptfs_xattr_get(const struct xattr_handler *handler,
1127 struct dentry *dentry, struct inode *inode,
1128 const char *name, void *buffer, size_t size)
1129{
1130 return ecryptfs_getxattr(dentry, inode, name, buffer, size);
1131}
1132
1133static int ecryptfs_xattr_set(const struct xattr_handler *handler,
1134 struct dentry *dentry, struct inode *inode,
1135 const char *name, const void *value, size_t size,
1136 int flags)
1137{
1138 if (value)
1139 return ecryptfs_setxattr(dentry, inode, name, value, size, flags);
1140 else {
1141 BUG_ON(flags != XATTR_REPLACE);
1142 return ecryptfs_removexattr(dentry, inode, name);
1143 }
1144}
1145
1146static const struct xattr_handler ecryptfs_xattr_handler = {
1147 .prefix = "", /* match anything */
1148 .get = ecryptfs_xattr_get,
1149 .set = ecryptfs_xattr_set,
1150};
1151
1152const struct xattr_handler *ecryptfs_xattr_handlers[] = {
1153 &ecryptfs_xattr_handler,
1154 NULL
1155};