Commit | Line | Data |
---|---|---|
237fead6 MH |
1 | /** |
2 | * eCryptfs: Linux filesystem encryption layer | |
3 | * | |
4 | * Copyright (C) 1997-2004 Erez Zadok | |
5 | * Copyright (C) 2001-2004 Stony Brook University | |
dd2a3b7a | 6 | * Copyright (C) 2004-2007 International Business Machines Corp. |
237fead6 MH |
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> | |
0cc72dc7 | 33 | #include <linux/fs_stack.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
0a688ad7 | 35 | #include <asm/unaligned.h> |
237fead6 MH |
36 | #include "ecryptfs_kernel.h" |
37 | ||
38 | static struct dentry *lock_parent(struct dentry *dentry) | |
39 | { | |
40 | struct dentry *dir; | |
41 | ||
8dc4e373 | 42 | dir = dget_parent(dentry); |
908e0a8a | 43 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
44 | return dir; |
45 | } | |
46 | ||
237fead6 MH |
47 | static void unlock_dir(struct dentry *dir) |
48 | { | |
49 | mutex_unlock(&dir->d_inode->i_mutex); | |
50 | dput(dir); | |
51 | } | |
52 | ||
237fead6 MH |
53 | /** |
54 | * ecryptfs_create_underlying_file | |
55 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
f70f582f | 56 | * @dentry: New file's dentry |
237fead6 MH |
57 | * @mode: The mode of the new file |
58 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
59 | * | |
60 | * Creates the file in the lower file system. | |
61 | * | |
62 | * Returns zero on success; non-zero on error condition | |
63 | */ | |
64 | static int | |
65 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
66 | struct dentry *dentry, int mode, | |
67 | struct nameidata *nd) | |
68 | { | |
69 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
70 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
71 | struct dentry *dentry_save; | |
72 | struct vfsmount *vfsmount_save; | |
73 | int rc; | |
74 | ||
4ac91378 JB |
75 | dentry_save = nd->path.dentry; |
76 | vfsmount_save = nd->path.mnt; | |
77 | nd->path.dentry = lower_dentry; | |
78 | nd->path.mnt = lower_mnt; | |
237fead6 | 79 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
4ac91378 JB |
80 | nd->path.dentry = dentry_save; |
81 | nd->path.mnt = vfsmount_save; | |
237fead6 MH |
82 | return rc; |
83 | } | |
84 | ||
85 | /** | |
86 | * ecryptfs_do_create | |
87 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
88 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
89 | * @mode: The mode of the new file | |
90 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
91 | * | |
92 | * Creates the underlying file and the eCryptfs inode which will link to | |
93 | * it. It will also update the eCryptfs directory inode to mimic the | |
94 | * stat of the lower directory inode. | |
95 | * | |
96 | * Returns zero on success; non-zero on error condition | |
97 | */ | |
98 | static int | |
99 | ecryptfs_do_create(struct inode *directory_inode, | |
100 | struct dentry *ecryptfs_dentry, int mode, | |
101 | struct nameidata *nd) | |
102 | { | |
103 | int rc; | |
104 | struct dentry *lower_dentry; | |
105 | struct dentry *lower_dir_dentry; | |
106 | ||
107 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
108 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 109 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
110 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
111 | "dentry\n"); | |
112 | rc = PTR_ERR(lower_dir_dentry); | |
113 | goto out; | |
114 | } | |
115 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
116 | ecryptfs_dentry, mode, nd); | |
4981e081 | 117 | if (rc) { |
caeeeecf | 118 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 119 | "rc = [%d]\n", __func__, rc); |
caeeeecf | 120 | goto out_lock; |
237fead6 MH |
121 | } |
122 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
123 | directory_inode->i_sb, 0); | |
124 | if (rc) { | |
125 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
126 | goto out_lock; | |
127 | } | |
0cc72dc7 JJS |
128 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
129 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
130 | out_lock: |
131 | unlock_dir(lower_dir_dentry); | |
132 | out: | |
133 | return rc; | |
134 | } | |
135 | ||
136 | /** | |
137 | * grow_file | |
d7cdc5fe | 138 | * @ecryptfs_dentry: the eCryptfs dentry |
237fead6 MH |
139 | * |
140 | * This is the code which will grow the file to its correct size. | |
141 | */ | |
d7cdc5fe | 142 | static int grow_file(struct dentry *ecryptfs_dentry) |
237fead6 | 143 | { |
d7cdc5fe | 144 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; |
d7cdc5fe MH |
145 | char zero_virt[] = { 0x00 }; |
146 | int rc = 0; | |
237fead6 | 147 | |
48c1e44a | 148 | rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1); |
d7cdc5fe MH |
149 | i_size_write(ecryptfs_inode, 0); |
150 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); | |
151 | ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= | |
152 | ECRYPTFS_NEW_FILE; | |
237fead6 MH |
153 | return rc; |
154 | } | |
155 | ||
156 | /** | |
157 | * ecryptfs_initialize_file | |
158 | * | |
159 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
160 | * file with a header and first data page. | |
161 | * | |
162 | * Returns zero on success | |
163 | */ | |
164 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
165 | { | |
d7cdc5fe MH |
166 | struct ecryptfs_crypt_stat *crypt_stat = |
167 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 168 | int rc = 0; |
237fead6 | 169 | |
237fead6 MH |
170 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
171 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 172 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 173 | goto out; |
237fead6 | 174 | } |
e2bd99ec | 175 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
176 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
177 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
178 | if (rc) { | |
d7cdc5fe MH |
179 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
180 | "context; rc = [%d]\n", rc); | |
181 | goto out; | |
237fead6 | 182 | } |
391b52f9 MH |
183 | if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { |
184 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); | |
185 | if (rc) { | |
186 | printk(KERN_ERR "%s: Error attempting to initialize " | |
187 | "the persistent file for the dentry with name " | |
188 | "[%s]; rc = [%d]\n", __func__, | |
189 | ecryptfs_dentry->d_name.name, rc); | |
190 | goto out; | |
191 | } | |
192 | } | |
d7cdc5fe | 193 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
237fead6 | 194 | if (rc) { |
d7cdc5fe MH |
195 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
196 | goto out; | |
237fead6 | 197 | } |
d7cdc5fe | 198 | rc = grow_file(ecryptfs_dentry); |
5dda6992 | 199 | if (rc) |
d7cdc5fe | 200 | printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); |
237fead6 MH |
201 | out: |
202 | return rc; | |
203 | } | |
204 | ||
205 | /** | |
206 | * ecryptfs_create | |
207 | * @dir: The inode of the directory in which to create the file. | |
208 | * @dentry: The eCryptfs dentry | |
209 | * @mode: The mode of the new file. | |
210 | * @nd: nameidata | |
211 | * | |
212 | * Creates a new file. | |
213 | * | |
214 | * Returns zero on success; non-zero on error condition | |
215 | */ | |
216 | static int | |
217 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
218 | int mode, struct nameidata *nd) | |
219 | { | |
220 | int rc; | |
221 | ||
addd65ad | 222 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
237fead6 MH |
223 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
224 | if (unlikely(rc)) { | |
225 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
226 | "lower filesystem\n"); | |
227 | goto out; | |
228 | } | |
229 | /* At this point, a file exists on "disk"; we need to make sure | |
230 | * that this on disk file is prepared to be an ecryptfs file */ | |
231 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
232 | out: | |
233 | return rc; | |
234 | } | |
235 | ||
236 | /** | |
addd65ad | 237 | * ecryptfs_lookup_and_interpose_lower - Perform a lookup |
237fead6 | 238 | */ |
addd65ad MH |
239 | int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, |
240 | struct dentry *lower_dentry, | |
addd65ad MH |
241 | struct inode *ecryptfs_dir_inode, |
242 | struct nameidata *ecryptfs_nd) | |
237fead6 | 243 | { |
237fead6 | 244 | struct dentry *lower_dir_dentry; |
237fead6 | 245 | struct vfsmount *lower_mnt; |
addd65ad | 246 | struct inode *lower_inode; |
e77a56dd | 247 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
2aac0cf8 | 248 | struct ecryptfs_crypt_stat *crypt_stat; |
237fead6 | 249 | char *page_virt = NULL; |
237fead6 | 250 | u64 file_size; |
addd65ad | 251 | int rc = 0; |
237fead6 | 252 | |
addd65ad MH |
253 | lower_dir_dentry = lower_dentry->d_parent; |
254 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( | |
255 | ecryptfs_dentry->d_parent)); | |
237fead6 | 256 | lower_inode = lower_dentry->d_inode; |
addd65ad | 257 | fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); |
237fead6 | 258 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
addd65ad | 259 | ecryptfs_set_dentry_private(ecryptfs_dentry, |
237fead6 | 260 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
e94b1766 | 261 | GFP_KERNEL)); |
addd65ad | 262 | if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { |
237fead6 | 263 | rc = -ENOMEM; |
addd65ad MH |
264 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
265 | "to allocate ecryptfs_dentry_info struct\n", | |
266 | __func__); | |
31f73bee | 267 | goto out_put; |
237fead6 | 268 | } |
addd65ad MH |
269 | ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); |
270 | ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); | |
237fead6 MH |
271 | if (!lower_dentry->d_inode) { |
272 | /* We want to add because we couldn't find in lower */ | |
addd65ad | 273 | d_add(ecryptfs_dentry, NULL); |
237fead6 MH |
274 | goto out; |
275 | } | |
addd65ad | 276 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
3469b573 EZ |
277 | ecryptfs_dir_inode->i_sb, |
278 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); | |
237fead6 | 279 | if (rc) { |
addd65ad MH |
280 | printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", |
281 | __func__, rc); | |
391b52f9 | 282 | goto out; |
237fead6 | 283 | } |
addd65ad | 284 | if (S_ISDIR(lower_inode->i_mode)) |
237fead6 | 285 | goto out; |
addd65ad | 286 | if (S_ISLNK(lower_inode->i_mode)) |
237fead6 | 287 | goto out; |
addd65ad | 288 | if (special_file(lower_inode->i_mode)) |
202a21d6 | 289 | goto out; |
addd65ad | 290 | if (!ecryptfs_nd) |
237fead6 | 291 | goto out; |
237fead6 | 292 | /* Released in this function */ |
addd65ad | 293 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); |
237fead6 | 294 | if (!page_virt) { |
addd65ad MH |
295 | printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", |
296 | __func__); | |
237fead6 | 297 | rc = -ENOMEM; |
391b52f9 | 298 | goto out; |
237fead6 | 299 | } |
addd65ad MH |
300 | if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { |
301 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); | |
391b52f9 MH |
302 | if (rc) { |
303 | printk(KERN_ERR "%s: Error attempting to initialize " | |
304 | "the persistent file for the dentry with name " | |
305 | "[%s]; rc = [%d]\n", __func__, | |
addd65ad MH |
306 | ecryptfs_dentry->d_name.name, rc); |
307 | goto out_free_kmem; | |
391b52f9 MH |
308 | } |
309 | } | |
2aac0cf8 TH |
310 | crypt_stat = &ecryptfs_inode_to_private( |
311 | ecryptfs_dentry->d_inode)->crypt_stat; | |
312 | /* TODO: lock for crypt_stat comparison */ | |
313 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
314 | ecryptfs_set_default_sizes(crypt_stat); | |
d7cdc5fe | 315 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
addd65ad | 316 | ecryptfs_dentry->d_inode); |
237fead6 | 317 | if (rc) { |
1984c23f | 318 | memset(page_virt, 0, PAGE_CACHE_SIZE); |
addd65ad MH |
319 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, |
320 | ecryptfs_dentry); | |
dd2a3b7a | 321 | if (rc) { |
dd2a3b7a | 322 | rc = 0; |
addd65ad | 323 | goto out_free_kmem; |
237fead6 | 324 | } |
dd2a3b7a | 325 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 326 | } |
e77a56dd | 327 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
addd65ad | 328 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
e77a56dd MH |
329 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { |
330 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
fa3ef1cb | 331 | file_size = (crypt_stat->metadata_size |
e77a56dd MH |
332 | + i_size_read(lower_dentry->d_inode)); |
333 | else | |
334 | file_size = i_size_read(lower_dentry->d_inode); | |
335 | } else { | |
0a688ad7 | 336 | file_size = get_unaligned_be64(page_virt); |
e77a56dd | 337 | } |
addd65ad MH |
338 | i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); |
339 | out_free_kmem: | |
237fead6 MH |
340 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
341 | goto out; | |
31f73bee | 342 | out_put: |
237fead6 | 343 | dput(lower_dentry); |
31f73bee | 344 | mntput(lower_mnt); |
addd65ad MH |
345 | d_drop(ecryptfs_dentry); |
346 | out: | |
347 | return rc; | |
348 | } | |
349 | ||
21edad32 LS |
350 | /** |
351 | * ecryptfs_new_lower_dentry | |
93c3fe40 | 352 | * @name: The name of the new dentry. |
21edad32 LS |
353 | * @lower_dir_dentry: Parent directory of the new dentry. |
354 | * @nd: nameidata from last lookup. | |
355 | * | |
356 | * Create a new dentry or get it from lower parent dir. | |
357 | */ | |
358 | static struct dentry * | |
359 | ecryptfs_new_lower_dentry(struct qstr *name, struct dentry *lower_dir_dentry, | |
360 | struct nameidata *nd) | |
361 | { | |
362 | struct dentry *new_dentry; | |
363 | struct dentry *tmp; | |
364 | struct inode *lower_dir_inode; | |
365 | ||
366 | lower_dir_inode = lower_dir_dentry->d_inode; | |
367 | ||
368 | tmp = d_alloc(lower_dir_dentry, name); | |
369 | if (!tmp) | |
370 | return ERR_PTR(-ENOMEM); | |
371 | ||
372 | mutex_lock(&lower_dir_inode->i_mutex); | |
373 | new_dentry = lower_dir_inode->i_op->lookup(lower_dir_inode, tmp, nd); | |
374 | mutex_unlock(&lower_dir_inode->i_mutex); | |
375 | ||
376 | if (!new_dentry) | |
377 | new_dentry = tmp; | |
378 | else | |
379 | dput(tmp); | |
380 | ||
381 | return new_dentry; | |
382 | } | |
383 | ||
384 | ||
385 | /** | |
386 | * ecryptfs_lookup_one_lower | |
387 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
388 | * @lower_dir_dentry: lower parent directory | |
93c3fe40 | 389 | * @name: lower file name |
21edad32 LS |
390 | * |
391 | * Get the lower dentry from vfs. If lower dentry does not exist yet, | |
392 | * create it. | |
393 | */ | |
394 | static struct dentry * | |
395 | ecryptfs_lookup_one_lower(struct dentry *ecryptfs_dentry, | |
93c3fe40 | 396 | struct dentry *lower_dir_dentry, struct qstr *name) |
21edad32 LS |
397 | { |
398 | struct nameidata nd; | |
399 | struct vfsmount *lower_mnt; | |
21edad32 LS |
400 | int err; |
401 | ||
21edad32 LS |
402 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( |
403 | ecryptfs_dentry->d_parent)); | |
404 | err = vfs_path_lookup(lower_dir_dentry, lower_mnt, name->name , 0, &nd); | |
405 | mntput(lower_mnt); | |
406 | ||
407 | if (!err) { | |
408 | /* we dont need the mount */ | |
409 | mntput(nd.path.mnt); | |
410 | return nd.path.dentry; | |
411 | } | |
412 | if (err != -ENOENT) | |
413 | return ERR_PTR(err); | |
414 | ||
415 | /* create a new lower dentry */ | |
416 | return ecryptfs_new_lower_dentry(name, lower_dir_dentry, &nd); | |
417 | } | |
418 | ||
addd65ad MH |
419 | /** |
420 | * ecryptfs_lookup | |
421 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
422 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
423 | * @ecryptfs_nd: nameidata; may be NULL | |
424 | * | |
425 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
426 | * dentry cache and continue on to read it from the disk. | |
427 | */ | |
428 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
429 | struct dentry *ecryptfs_dentry, | |
430 | struct nameidata *ecryptfs_nd) | |
431 | { | |
432 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 433 | size_t encrypted_and_encoded_name_size; |
addd65ad | 434 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad | 435 | struct dentry *lower_dir_dentry, *lower_dentry; |
93c3fe40 | 436 | struct qstr lower_name; |
addd65ad MH |
437 | int rc = 0; |
438 | ||
439 | ecryptfs_dentry->d_op = &ecryptfs_dops; | |
440 | if ((ecryptfs_dentry->d_name.len == 1 | |
441 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
442 | || (ecryptfs_dentry->d_name.len == 2 | |
443 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
444 | goto out_d_drop; | |
445 | } | |
446 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
93c3fe40 TH |
447 | lower_name.name = ecryptfs_dentry->d_name.name; |
448 | lower_name.len = ecryptfs_dentry->d_name.len; | |
449 | lower_name.hash = ecryptfs_dentry->d_name.hash; | |
450 | if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) { | |
451 | rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry, | |
452 | &lower_name); | |
453 | if (rc < 0) | |
454 | goto out_d_drop; | |
455 | } | |
21edad32 | 456 | lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, |
93c3fe40 | 457 | lower_dir_dentry, &lower_name); |
addd65ad MH |
458 | if (IS_ERR(lower_dentry)) { |
459 | rc = PTR_ERR(lower_dentry); | |
21edad32 | 460 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " |
9f37622f TH |
461 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
462 | encrypted_and_encoded_name); | |
addd65ad MH |
463 | goto out_d_drop; |
464 | } | |
465 | if (lower_dentry->d_inode) | |
466 | goto lookup_and_interpose; | |
2aac0cf8 TH |
467 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
468 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
469 | if (!(mount_crypt_stat | |
470 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
addd65ad MH |
471 | goto lookup_and_interpose; |
472 | dput(lower_dentry); | |
473 | rc = ecryptfs_encrypt_and_encode_filename( | |
474 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 475 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
476 | ecryptfs_dentry->d_name.len); |
477 | if (rc) { | |
478 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
479 | "filename; rc = [%d]\n", __func__, rc); | |
480 | goto out_d_drop; | |
481 | } | |
93c3fe40 TH |
482 | lower_name.name = encrypted_and_encoded_name; |
483 | lower_name.len = encrypted_and_encoded_name_size; | |
484 | lower_name.hash = full_name_hash(lower_name.name, lower_name.len); | |
485 | if (lower_dir_dentry->d_op && lower_dir_dentry->d_op->d_hash) { | |
486 | rc = lower_dir_dentry->d_op->d_hash(lower_dir_dentry, | |
487 | &lower_name); | |
488 | if (rc < 0) | |
489 | goto out_d_drop; | |
490 | } | |
21edad32 | 491 | lower_dentry = ecryptfs_lookup_one_lower(ecryptfs_dentry, |
93c3fe40 | 492 | lower_dir_dentry, &lower_name); |
addd65ad MH |
493 | if (IS_ERR(lower_dentry)) { |
494 | rc = PTR_ERR(lower_dentry); | |
21edad32 | 495 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_lower() returned " |
9f37622f TH |
496 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
497 | encrypted_and_encoded_name); | |
addd65ad MH |
498 | goto out_d_drop; |
499 | } | |
500 | lookup_and_interpose: | |
501 | rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, | |
2aac0cf8 | 502 | ecryptfs_dir_inode, |
addd65ad MH |
503 | ecryptfs_nd); |
504 | goto out; | |
505 | out_d_drop: | |
506 | d_drop(ecryptfs_dentry); | |
237fead6 | 507 | out: |
addd65ad | 508 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
509 | return ERR_PTR(rc); |
510 | } | |
511 | ||
512 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
513 | struct dentry *new_dentry) | |
514 | { | |
515 | struct dentry *lower_old_dentry; | |
516 | struct dentry *lower_new_dentry; | |
517 | struct dentry *lower_dir_dentry; | |
518 | u64 file_size_save; | |
519 | int rc; | |
520 | ||
521 | file_size_save = i_size_read(old_dentry->d_inode); | |
522 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
523 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
524 | dget(lower_old_dentry); | |
525 | dget(lower_new_dentry); | |
526 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
527 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
528 | lower_new_dentry); | |
529 | if (rc || !lower_new_dentry->d_inode) | |
530 | goto out_lock; | |
531 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
532 | if (rc) | |
533 | goto out_lock; | |
3a8380c0 TH |
534 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
535 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
536 | old_dentry->d_inode->i_nlink = |
537 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
538 | i_size_write(new_dentry->d_inode, file_size_save); | |
539 | out_lock: | |
540 | unlock_dir(lower_dir_dentry); | |
541 | dput(lower_new_dentry); | |
542 | dput(lower_old_dentry); | |
237fead6 MH |
543 | return rc; |
544 | } | |
545 | ||
546 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
547 | { | |
548 | int rc = 0; | |
549 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
550 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 551 | struct dentry *lower_dir_dentry; |
237fead6 | 552 | |
9c2d2056 | 553 | dget(lower_dentry); |
8dc4e373 | 554 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
555 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
556 | if (rc) { | |
ae56fb16 | 557 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
558 | goto out_unlock; |
559 | } | |
0cc72dc7 | 560 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
561 | dentry->d_inode->i_nlink = |
562 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
563 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 564 | d_drop(dentry); |
237fead6 | 565 | out_unlock: |
8dc4e373 | 566 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 567 | dput(lower_dentry); |
237fead6 MH |
568 | return rc; |
569 | } | |
570 | ||
571 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
572 | const char *symname) | |
573 | { | |
574 | int rc; | |
575 | struct dentry *lower_dentry; | |
576 | struct dentry *lower_dir_dentry; | |
237fead6 | 577 | char *encoded_symname; |
addd65ad MH |
578 | size_t encoded_symlen; |
579 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
580 | |
581 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
582 | dget(lower_dentry); | |
583 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
584 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
585 | dir->i_sb)->mount_crypt_stat; | |
586 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
587 | &encoded_symlen, | |
588 | NULL, | |
589 | mount_crypt_stat, symname, | |
590 | strlen(symname)); | |
591 | if (rc) | |
237fead6 | 592 | goto out_lock; |
237fead6 | 593 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 594 | encoded_symname); |
237fead6 MH |
595 | kfree(encoded_symname); |
596 | if (rc || !lower_dentry->d_inode) | |
597 | goto out_lock; | |
598 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
599 | if (rc) | |
600 | goto out_lock; | |
0cc72dc7 JJS |
601 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
602 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
603 | out_lock: |
604 | unlock_dir(lower_dir_dentry); | |
605 | dput(lower_dentry); | |
606 | if (!dentry->d_inode) | |
607 | d_drop(dentry); | |
608 | return rc; | |
609 | } | |
610 | ||
611 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
612 | { | |
613 | int rc; | |
614 | struct dentry *lower_dentry; | |
615 | struct dentry *lower_dir_dentry; | |
616 | ||
617 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
618 | lower_dir_dentry = lock_parent(lower_dentry); | |
619 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
620 | if (rc || !lower_dentry->d_inode) | |
621 | goto out; | |
622 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
623 | if (rc) | |
624 | goto out; | |
0cc72dc7 JJS |
625 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
626 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
627 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
628 | out: | |
629 | unlock_dir(lower_dir_dentry); | |
630 | if (!dentry->d_inode) | |
631 | d_drop(dentry); | |
632 | return rc; | |
633 | } | |
634 | ||
635 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
636 | { | |
237fead6 | 637 | struct dentry *lower_dentry; |
237fead6 | 638 | struct dentry *lower_dir_dentry; |
45ec4aba | 639 | int rc; |
237fead6 MH |
640 | |
641 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 642 | dget(dentry); |
237fead6 | 643 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 644 | dget(lower_dentry); |
237fead6 | 645 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
646 | dput(lower_dentry); |
647 | if (!rc) | |
648 | d_delete(lower_dentry); | |
0cc72dc7 | 649 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
650 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
651 | unlock_dir(lower_dir_dentry); | |
652 | if (!rc) | |
653 | d_drop(dentry); | |
45ec4aba | 654 | dput(dentry); |
237fead6 MH |
655 | return rc; |
656 | } | |
657 | ||
658 | static int | |
659 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
660 | { | |
661 | int rc; | |
662 | struct dentry *lower_dentry; | |
663 | struct dentry *lower_dir_dentry; | |
664 | ||
665 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
666 | lower_dir_dentry = lock_parent(lower_dentry); | |
667 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
668 | if (rc || !lower_dentry->d_inode) | |
669 | goto out; | |
391b52f9 | 670 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
237fead6 MH |
671 | if (rc) |
672 | goto out; | |
0cc72dc7 JJS |
673 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
674 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
675 | out: |
676 | unlock_dir(lower_dir_dentry); | |
677 | if (!dentry->d_inode) | |
678 | d_drop(dentry); | |
679 | return rc; | |
680 | } | |
681 | ||
682 | static int | |
683 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
684 | struct inode *new_dir, struct dentry *new_dentry) | |
685 | { | |
686 | int rc; | |
687 | struct dentry *lower_old_dentry; | |
688 | struct dentry *lower_new_dentry; | |
689 | struct dentry *lower_old_dir_dentry; | |
690 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 691 | struct dentry *trap = NULL; |
237fead6 MH |
692 | |
693 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
694 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
695 | dget(lower_old_dentry); | |
696 | dget(lower_new_dentry); | |
697 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
698 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
699 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
700 | /* source should not be ancestor of target */ | |
701 | if (trap == lower_old_dentry) { | |
702 | rc = -EINVAL; | |
703 | goto out_lock; | |
704 | } | |
705 | /* target should not be ancestor of source */ | |
706 | if (trap == lower_new_dentry) { | |
707 | rc = -ENOTEMPTY; | |
708 | goto out_lock; | |
709 | } | |
237fead6 MH |
710 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
711 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
712 | if (rc) | |
713 | goto out_lock; | |
9afa2fb6 | 714 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 715 | if (new_dir != old_dir) |
9afa2fb6 | 716 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
717 | out_lock: |
718 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
719 | dput(lower_new_dentry->d_parent); |
720 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
721 | dput(lower_new_dentry); |
722 | dput(lower_old_dentry); | |
723 | return rc; | |
724 | } | |
725 | ||
3a60a168 TH |
726 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
727 | size_t *bufsiz) | |
237fead6 | 728 | { |
3a60a168 | 729 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 730 | char *lower_buf; |
3a60a168 | 731 | size_t lower_bufsiz = PATH_MAX; |
addd65ad MH |
732 | mm_segment_t old_fs; |
733 | int rc; | |
237fead6 | 734 | |
3a6b42ca | 735 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
3a60a168 | 736 | if (!lower_buf) { |
237fead6 MH |
737 | rc = -ENOMEM; |
738 | goto out; | |
739 | } | |
740 | old_fs = get_fs(); | |
741 | set_fs(get_ds()); | |
237fead6 MH |
742 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
743 | (char __user *)lower_buf, | |
3a6b42ca | 744 | lower_bufsiz); |
237fead6 | 745 | set_fs(old_fs); |
3a60a168 TH |
746 | if (rc < 0) |
747 | goto out; | |
748 | lower_bufsiz = rc; | |
749 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, | |
750 | lower_buf, lower_bufsiz); | |
751 | out: | |
237fead6 | 752 | kfree(lower_buf); |
3a60a168 TH |
753 | return rc; |
754 | } | |
755 | ||
756 | static int | |
757 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) | |
758 | { | |
759 | char *kbuf; | |
760 | size_t kbufsiz, copied; | |
761 | int rc; | |
762 | ||
763 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); | |
764 | if (rc) | |
765 | goto out; | |
766 | copied = min_t(size_t, bufsiz, kbufsiz); | |
767 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; | |
768 | kfree(kbuf); | |
769 | fsstack_copy_attr_atime(dentry->d_inode, | |
770 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
237fead6 MH |
771 | out: |
772 | return rc; | |
773 | } | |
774 | ||
775 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
776 | { | |
777 | char *buf; | |
778 | int len = PAGE_SIZE, rc; | |
779 | mm_segment_t old_fs; | |
780 | ||
781 | /* Released in ecryptfs_put_link(); only release here on error */ | |
782 | buf = kmalloc(len, GFP_KERNEL); | |
783 | if (!buf) { | |
806892e9 | 784 | buf = ERR_PTR(-ENOMEM); |
237fead6 MH |
785 | goto out; |
786 | } | |
787 | old_fs = get_fs(); | |
788 | set_fs(get_ds()); | |
237fead6 | 789 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
237fead6 | 790 | set_fs(old_fs); |
806892e9 OH |
791 | if (rc < 0) { |
792 | kfree(buf); | |
793 | buf = ERR_PTR(rc); | |
794 | } else | |
a17d5232 | 795 | buf[rc] = '\0'; |
237fead6 | 796 | out: |
806892e9 OH |
797 | nd_set_link(nd, buf); |
798 | return NULL; | |
237fead6 MH |
799 | } |
800 | ||
801 | static void | |
802 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
803 | { | |
806892e9 OH |
804 | char *buf = nd_get_link(nd); |
805 | if (!IS_ERR(buf)) { | |
806 | /* Free the char* */ | |
807 | kfree(buf); | |
808 | } | |
237fead6 MH |
809 | } |
810 | ||
811 | /** | |
812 | * upper_size_to_lower_size | |
813 | * @crypt_stat: Crypt_stat associated with file | |
814 | * @upper_size: Size of the upper file | |
815 | * | |
cc11beff | 816 | * Calculate the required size of the lower file based on the |
237fead6 MH |
817 | * specified size of the upper file. This calculation is based on the |
818 | * number of headers in the underlying file and the extent size. | |
819 | * | |
820 | * Returns Calculated size of the lower file. | |
821 | */ | |
822 | static loff_t | |
823 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
824 | loff_t upper_size) | |
825 | { | |
826 | loff_t lower_size; | |
827 | ||
157f1071 | 828 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
829 | if (upper_size != 0) { |
830 | loff_t num_extents; | |
831 | ||
832 | num_extents = upper_size >> crypt_stat->extent_shift; | |
833 | if (upper_size & ~crypt_stat->extent_mask) | |
834 | num_extents++; | |
835 | lower_size += (num_extents * crypt_stat->extent_size); | |
836 | } | |
837 | return lower_size; | |
838 | } | |
839 | ||
840 | /** | |
5f3ef64f | 841 | * truncate_upper |
237fead6 | 842 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
843 | * @ia: Address of the ecryptfs inode's attributes |
844 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
845 | * |
846 | * Function to handle truncations modifying the size of the file. Note | |
847 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
848 | * writing strings of 0's out. When truncating, we truncate the upper |
849 | * inode and update the lower_ia according to the page index | |
850 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
851 | * the caller must use lower_ia in a call to notify_change() to perform | |
852 | * the truncation of the lower inode. | |
237fead6 MH |
853 | * |
854 | * Returns zero on success; non-zero otherwise | |
855 | */ | |
5f3ef64f TH |
856 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
857 | struct iattr *lower_ia) | |
237fead6 MH |
858 | { |
859 | int rc = 0; | |
860 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
861 | struct ecryptfs_crypt_stat *crypt_stat; |
862 | loff_t i_size = i_size_read(inode); | |
863 | loff_t lower_size_before_truncate; | |
864 | loff_t lower_size_after_truncate; | |
865 | ||
5f3ef64f TH |
866 | if (unlikely((ia->ia_size == i_size))) { |
867 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 868 | goto out; |
5f3ef64f | 869 | } |
237fead6 | 870 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 871 | /* Switch on growing or shrinking file */ |
5f3ef64f | 872 | if (ia->ia_size > i_size) { |
2ed92554 MH |
873 | char zero[] = { 0x00 }; |
874 | ||
5f3ef64f | 875 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
876 | /* Write a single 0 at the last position of the file; |
877 | * this triggers code that will fill in 0's throughout | |
878 | * the intermediate portion of the previous end of the | |
879 | * file and the new and of the file */ | |
48c1e44a | 880 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
881 | (ia->ia_size - 1), 1); |
882 | } else { /* ia->ia_size < i_size_read(inode) */ | |
883 | /* We're chopping off all the pages down to the page | |
884 | * in which ia->ia_size is located. Fill in the end of | |
885 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
886 | * PAGE_CACHE_SIZE with zeros. */ |
887 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 888 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 889 | |
2c27c65e CH |
890 | |
891 | /* | |
892 | * XXX(truncate) this should really happen at the begginning | |
893 | * of ->setattr. But the code is too messy to that as part | |
894 | * of a larger patch. ecryptfs is also totally missing out | |
895 | * on the inode_change_ok check at the beginning of | |
896 | * ->setattr while would include this. | |
897 | */ | |
898 | rc = inode_newsize_ok(inode, ia->ia_size); | |
899 | if (rc) | |
900 | goto out; | |
901 | ||
13a791b4 | 902 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 903 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
904 | lower_ia->ia_size = ia->ia_size; |
905 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 906 | goto out; |
13a791b4 | 907 | } |
2ed92554 MH |
908 | if (num_zeros) { |
909 | char *zeros_virt; | |
910 | ||
911 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
912 | if (!zeros_virt) { | |
913 | rc = -ENOMEM; | |
48c1e44a | 914 | goto out; |
2ed92554 | 915 | } |
48c1e44a | 916 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 917 | ia->ia_size, num_zeros); |
2ed92554 | 918 | kfree(zeros_virt); |
5dda6992 | 919 | if (rc) { |
240e2df5 MH |
920 | printk(KERN_ERR "Error attempting to zero out " |
921 | "the remainder of the end page on " | |
922 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 923 | goto out; |
240e2df5 MH |
924 | } |
925 | } | |
2c27c65e | 926 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 927 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
928 | if (rc) { |
929 | printk(KERN_ERR "Problem with " | |
930 | "ecryptfs_write_inode_size_to_metadata; " | |
931 | "rc = [%d]\n", rc); | |
48c1e44a | 932 | goto out; |
dd2a3b7a | 933 | } |
237fead6 MH |
934 | /* We are reducing the size of the ecryptfs file, and need to |
935 | * know if we need to reduce the size of the lower file. */ | |
936 | lower_size_before_truncate = | |
937 | upper_size_to_lower_size(crypt_stat, i_size); | |
938 | lower_size_after_truncate = | |
5f3ef64f TH |
939 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
940 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
941 | lower_ia->ia_size = lower_size_after_truncate; | |
942 | lower_ia->ia_valid |= ATTR_SIZE; | |
943 | } else | |
944 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 945 | } |
237fead6 MH |
946 | out: |
947 | return rc; | |
948 | } | |
949 | ||
5f3ef64f TH |
950 | /** |
951 | * ecryptfs_truncate | |
952 | * @dentry: The ecryptfs layer dentry | |
953 | * @new_length: The length to expand the file to | |
954 | * | |
955 | * Simple function that handles the truncation of an eCryptfs inode and | |
956 | * its corresponding lower inode. | |
957 | * | |
958 | * Returns zero on success; non-zero otherwise | |
959 | */ | |
960 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
961 | { | |
962 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
963 | struct iattr lower_ia = { .ia_valid = 0 }; | |
964 | int rc; | |
965 | ||
966 | rc = truncate_upper(dentry, &ia, &lower_ia); | |
967 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
968 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
969 | ||
970 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
971 | rc = notify_change(lower_dentry, &lower_ia); | |
972 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
973 | } | |
974 | return rc; | |
975 | } | |
976 | ||
237fead6 | 977 | static int |
e6305c43 | 978 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 979 | { |
f419a2e3 | 980 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
981 | } |
982 | ||
983 | /** | |
984 | * ecryptfs_setattr | |
985 | * @dentry: dentry handle to the inode to modify | |
986 | * @ia: Structure with flags of what to change and values | |
987 | * | |
988 | * Updates the metadata of an inode. If the update is to the size | |
989 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
990 | * of both the ecryptfs inode and the lower inode. | |
991 | * | |
992 | * All other metadata changes will be passed right to the lower filesystem, | |
993 | * and we will just update our inode to look like the lower. | |
994 | */ | |
995 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
996 | { | |
997 | int rc = 0; | |
998 | struct dentry *lower_dentry; | |
5f3ef64f | 999 | struct iattr lower_ia; |
237fead6 MH |
1000 | struct inode *inode; |
1001 | struct inode *lower_inode; | |
1002 | struct ecryptfs_crypt_stat *crypt_stat; | |
1003 | ||
1004 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
1005 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
1006 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
1007 | inode = dentry->d_inode; |
1008 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
1009 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
1010 | mutex_lock(&crypt_stat->cs_mutex); | |
1011 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
1012 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
1013 | else if (S_ISREG(dentry->d_inode->i_mode) |
1014 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
1015 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 1016 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 1017 | |
e10f281b MH |
1018 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
1019 | dentry->d_sb)->mount_crypt_stat; | |
d7cdc5fe | 1020 | rc = ecryptfs_read_metadata(dentry); |
5dda6992 | 1021 | if (rc) { |
e10f281b MH |
1022 | if (!(mount_crypt_stat->flags |
1023 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
1024 | rc = -EIO; | |
25bd8174 | 1025 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 1026 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
1027 | "or the key could not be retrieved. " |
1028 | "Plaintext passthrough mode is not " | |
e10f281b | 1029 | "enabled; returning -EIO\n"); |
e10f281b | 1030 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
1031 | goto out; |
1032 | } | |
1033 | rc = 0; | |
1034 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
e10f281b | 1035 | } |
e10f281b MH |
1036 | } |
1037 | mutex_unlock(&crypt_stat->cs_mutex); | |
5f3ef64f TH |
1038 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
1039 | if (ia->ia_valid & ATTR_FILE) | |
1040 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 1041 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 1042 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
1043 | if (rc < 0) |
1044 | goto out; | |
1045 | } | |
1ac564ec JL |
1046 | |
1047 | /* | |
1048 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
1049 | * to interpret this in its own way. | |
1050 | */ | |
5f3ef64f TH |
1051 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
1052 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 1053 | |
9c3580aa | 1054 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 1055 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 1056 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 1057 | out: |
9afa2fb6 | 1058 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
1059 | return rc; |
1060 | } | |
1061 | ||
3a60a168 TH |
1062 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
1063 | struct kstat *stat) | |
1064 | { | |
1065 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
1066 | int rc = 0; | |
1067 | ||
1068 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
1069 | dentry->d_sb)->mount_crypt_stat; | |
1070 | generic_fillattr(dentry->d_inode, stat); | |
1071 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
1072 | char *target; | |
1073 | size_t targetsiz; | |
1074 | ||
1075 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
1076 | if (!rc) { | |
1077 | kfree(target); | |
1078 | stat->size = targetsiz; | |
1079 | } | |
1080 | } | |
1081 | return rc; | |
1082 | } | |
1083 | ||
f8f484d1 TH |
1084 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1085 | struct kstat *stat) | |
1086 | { | |
1087 | struct kstat lower_stat; | |
1088 | int rc; | |
1089 | ||
1090 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1091 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1092 | if (!rc) { | |
1093 | generic_fillattr(dentry->d_inode, stat); | |
1094 | stat->blocks = lower_stat.blocks; | |
1095 | } | |
1096 | return rc; | |
1097 | } | |
1098 | ||
dd2a3b7a | 1099 | int |
237fead6 MH |
1100 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1101 | size_t size, int flags) | |
1102 | { | |
1103 | int rc = 0; | |
1104 | struct dentry *lower_dentry; | |
1105 | ||
1106 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1107 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1108 | rc = -EOPNOTSUPP; |
237fead6 MH |
1109 | goto out; |
1110 | } | |
1111 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1112 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
1113 | size, flags); | |
1114 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1115 | out: | |
1116 | return rc; | |
1117 | } | |
1118 | ||
d7cdc5fe MH |
1119 | ssize_t |
1120 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1121 | void *value, size_t size) | |
1122 | { | |
1123 | int rc = 0; | |
1124 | ||
1125 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1126 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1127 | goto out; |
1128 | } | |
1129 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1130 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1131 | size); | |
1132 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1133 | out: | |
1134 | return rc; | |
1135 | } | |
1136 | ||
7896b631 | 1137 | static ssize_t |
237fead6 MH |
1138 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1139 | size_t size) | |
1140 | { | |
2ed92554 MH |
1141 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1142 | value, size); | |
237fead6 MH |
1143 | } |
1144 | ||
1145 | static ssize_t | |
1146 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1147 | { | |
1148 | int rc = 0; | |
1149 | struct dentry *lower_dentry; | |
1150 | ||
1151 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1152 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1153 | rc = -EOPNOTSUPP; |
237fead6 MH |
1154 | goto out; |
1155 | } | |
1156 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1157 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1158 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1159 | out: | |
1160 | return rc; | |
1161 | } | |
1162 | ||
1163 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1164 | { | |
1165 | int rc = 0; | |
1166 | struct dentry *lower_dentry; | |
1167 | ||
1168 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1169 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1170 | rc = -EOPNOTSUPP; |
237fead6 MH |
1171 | goto out; |
1172 | } | |
1173 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1174 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1175 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1176 | out: | |
1177 | return rc; | |
1178 | } | |
1179 | ||
1180 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1181 | { | |
1182 | if ((ecryptfs_inode_to_lower(inode) | |
1183 | == (struct inode *)candidate_lower_inode)) | |
1184 | return 1; | |
1185 | else | |
1186 | return 0; | |
1187 | } | |
1188 | ||
1189 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1190 | { | |
1191 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1192 | return 0; | |
1193 | } | |
1194 | ||
754661f1 | 1195 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1196 | .readlink = ecryptfs_readlink, |
1197 | .follow_link = ecryptfs_follow_link, | |
1198 | .put_link = ecryptfs_put_link, | |
1199 | .permission = ecryptfs_permission, | |
1200 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1201 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1202 | .setxattr = ecryptfs_setxattr, |
1203 | .getxattr = ecryptfs_getxattr, | |
1204 | .listxattr = ecryptfs_listxattr, | |
1205 | .removexattr = ecryptfs_removexattr | |
1206 | }; | |
1207 | ||
754661f1 | 1208 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1209 | .create = ecryptfs_create, |
1210 | .lookup = ecryptfs_lookup, | |
1211 | .link = ecryptfs_link, | |
1212 | .unlink = ecryptfs_unlink, | |
1213 | .symlink = ecryptfs_symlink, | |
1214 | .mkdir = ecryptfs_mkdir, | |
1215 | .rmdir = ecryptfs_rmdir, | |
1216 | .mknod = ecryptfs_mknod, | |
1217 | .rename = ecryptfs_rename, | |
1218 | .permission = ecryptfs_permission, | |
1219 | .setattr = ecryptfs_setattr, | |
1220 | .setxattr = ecryptfs_setxattr, | |
1221 | .getxattr = ecryptfs_getxattr, | |
1222 | .listxattr = ecryptfs_listxattr, | |
1223 | .removexattr = ecryptfs_removexattr | |
1224 | }; | |
1225 | ||
754661f1 | 1226 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1227 | .permission = ecryptfs_permission, |
1228 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1229 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1230 | .setxattr = ecryptfs_setxattr, |
1231 | .getxattr = ecryptfs_getxattr, | |
1232 | .listxattr = ecryptfs_listxattr, | |
1233 | .removexattr = ecryptfs_removexattr | |
1234 | }; |