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TOMOYO Linux Cross Reference
Linux/fs/ecryptfs/inode.c

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

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