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Commit | Line | Data |
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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> |
48b512e6 | 35 | #include <linux/xattr.h> |
0a688ad7 | 36 | #include <asm/unaligned.h> |
237fead6 MH |
37 | #include "ecryptfs_kernel.h" |
38 | ||
39 | static struct dentry *lock_parent(struct dentry *dentry) | |
40 | { | |
41 | struct dentry *dir; | |
42 | ||
8dc4e373 | 43 | dir = dget_parent(dentry); |
908e0a8a | 44 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
45 | return dir; |
46 | } | |
47 | ||
237fead6 MH |
48 | static void unlock_dir(struct dentry *dir) |
49 | { | |
50 | mutex_unlock(&dir->d_inode->i_mutex); | |
51 | dput(dir); | |
52 | } | |
53 | ||
237fead6 MH |
54 | /** |
55 | * ecryptfs_create_underlying_file | |
56 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
f70f582f | 57 | * @dentry: New file's dentry |
237fead6 MH |
58 | * @mode: The mode of the new file |
59 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
60 | * | |
61 | * Creates the file in the lower file system. | |
62 | * | |
63 | * Returns zero on success; non-zero on error condition | |
64 | */ | |
65 | static int | |
66 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
67 | struct dentry *dentry, int mode, | |
68 | struct nameidata *nd) | |
69 | { | |
70 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
71 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
72 | struct dentry *dentry_save; | |
73 | struct vfsmount *vfsmount_save; | |
2e21b3f1 | 74 | unsigned int flags_save; |
237fead6 MH |
75 | int rc; |
76 | ||
70b89021 TH |
77 | if (nd) { |
78 | dentry_save = nd->path.dentry; | |
79 | vfsmount_save = nd->path.mnt; | |
80 | flags_save = nd->flags; | |
81 | nd->path.dentry = lower_dentry; | |
82 | nd->path.mnt = lower_mnt; | |
83 | nd->flags &= ~LOOKUP_OPEN; | |
84 | } | |
237fead6 | 85 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
70b89021 TH |
86 | if (nd) { |
87 | nd->path.dentry = dentry_save; | |
88 | nd->path.mnt = vfsmount_save; | |
89 | nd->flags = flags_save; | |
90 | } | |
237fead6 MH |
91 | return rc; |
92 | } | |
93 | ||
94 | /** | |
95 | * ecryptfs_do_create | |
96 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
97 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
98 | * @mode: The mode of the new file | |
99 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
100 | * | |
101 | * Creates the underlying file and the eCryptfs inode which will link to | |
102 | * it. It will also update the eCryptfs directory inode to mimic the | |
103 | * stat of the lower directory inode. | |
104 | * | |
105 | * Returns zero on success; non-zero on error condition | |
106 | */ | |
107 | static int | |
108 | ecryptfs_do_create(struct inode *directory_inode, | |
109 | struct dentry *ecryptfs_dentry, int mode, | |
110 | struct nameidata *nd) | |
111 | { | |
112 | int rc; | |
113 | struct dentry *lower_dentry; | |
114 | struct dentry *lower_dir_dentry; | |
115 | ||
116 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
117 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 118 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
119 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
120 | "dentry\n"); | |
121 | rc = PTR_ERR(lower_dir_dentry); | |
122 | goto out; | |
123 | } | |
124 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
125 | ecryptfs_dentry, mode, nd); | |
4981e081 | 126 | if (rc) { |
caeeeecf | 127 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 128 | "rc = [%d]\n", __func__, rc); |
caeeeecf | 129 | goto out_lock; |
237fead6 MH |
130 | } |
131 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
132 | directory_inode->i_sb, 0); | |
133 | if (rc) { | |
134 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
135 | goto out_lock; | |
136 | } | |
0cc72dc7 JJS |
137 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
138 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
139 | out_lock: |
140 | unlock_dir(lower_dir_dentry); | |
141 | out: | |
142 | return rc; | |
143 | } | |
144 | ||
145 | /** | |
146 | * grow_file | |
d7cdc5fe | 147 | * @ecryptfs_dentry: the eCryptfs dentry |
237fead6 MH |
148 | * |
149 | * This is the code which will grow the file to its correct size. | |
150 | */ | |
d7cdc5fe | 151 | static int grow_file(struct dentry *ecryptfs_dentry) |
237fead6 | 152 | { |
d7cdc5fe | 153 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; |
d7cdc5fe MH |
154 | char zero_virt[] = { 0x00 }; |
155 | int rc = 0; | |
237fead6 | 156 | |
48c1e44a | 157 | rc = ecryptfs_write(ecryptfs_inode, zero_virt, 0, 1); |
d7cdc5fe MH |
158 | i_size_write(ecryptfs_inode, 0); |
159 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); | |
160 | ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= | |
161 | ECRYPTFS_NEW_FILE; | |
237fead6 MH |
162 | return rc; |
163 | } | |
164 | ||
165 | /** | |
166 | * ecryptfs_initialize_file | |
167 | * | |
168 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
169 | * file with a header and first data page. | |
170 | * | |
171 | * Returns zero on success | |
172 | */ | |
173 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
174 | { | |
d7cdc5fe MH |
175 | struct ecryptfs_crypt_stat *crypt_stat = |
176 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 177 | int rc = 0; |
237fead6 | 178 | |
237fead6 MH |
179 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
180 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 181 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 182 | goto out; |
237fead6 | 183 | } |
e2bd99ec | 184 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
185 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
186 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
187 | if (rc) { | |
d7cdc5fe MH |
188 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
189 | "context; rc = [%d]\n", rc); | |
190 | goto out; | |
237fead6 | 191 | } |
27992890 RS |
192 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
193 | if (rc) { | |
194 | printk(KERN_ERR "%s: Error attempting to initialize " | |
195 | "the persistent file for the dentry with name " | |
196 | "[%s]; rc = [%d]\n", __func__, | |
197 | ecryptfs_dentry->d_name.name, rc); | |
198 | goto out; | |
391b52f9 | 199 | } |
d7cdc5fe | 200 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
237fead6 | 201 | if (rc) { |
d7cdc5fe MH |
202 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
203 | goto out; | |
237fead6 | 204 | } |
d7cdc5fe | 205 | rc = grow_file(ecryptfs_dentry); |
5dda6992 | 206 | if (rc) |
d7cdc5fe | 207 | printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); |
237fead6 MH |
208 | out: |
209 | return rc; | |
210 | } | |
211 | ||
212 | /** | |
213 | * ecryptfs_create | |
214 | * @dir: The inode of the directory in which to create the file. | |
215 | * @dentry: The eCryptfs dentry | |
216 | * @mode: The mode of the new file. | |
217 | * @nd: nameidata | |
218 | * | |
219 | * Creates a new file. | |
220 | * | |
221 | * Returns zero on success; non-zero on error condition | |
222 | */ | |
223 | static int | |
224 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
225 | int mode, struct nameidata *nd) | |
226 | { | |
227 | int rc; | |
228 | ||
addd65ad | 229 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
237fead6 MH |
230 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
231 | if (unlikely(rc)) { | |
232 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
233 | "lower filesystem\n"); | |
234 | goto out; | |
235 | } | |
236 | /* At this point, a file exists on "disk"; we need to make sure | |
237 | * that this on disk file is prepared to be an ecryptfs file */ | |
238 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
239 | out: | |
240 | return rc; | |
241 | } | |
242 | ||
243 | /** | |
addd65ad | 244 | * ecryptfs_lookup_and_interpose_lower - Perform a lookup |
237fead6 | 245 | */ |
addd65ad MH |
246 | int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, |
247 | struct dentry *lower_dentry, | |
70b89021 | 248 | struct inode *ecryptfs_dir_inode) |
237fead6 | 249 | { |
237fead6 | 250 | struct dentry *lower_dir_dentry; |
237fead6 | 251 | struct vfsmount *lower_mnt; |
addd65ad | 252 | struct inode *lower_inode; |
e77a56dd | 253 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
2aac0cf8 | 254 | struct ecryptfs_crypt_stat *crypt_stat; |
237fead6 | 255 | char *page_virt = NULL; |
237fead6 | 256 | u64 file_size; |
addd65ad | 257 | int rc = 0; |
237fead6 | 258 | |
addd65ad MH |
259 | lower_dir_dentry = lower_dentry->d_parent; |
260 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( | |
261 | ecryptfs_dentry->d_parent)); | |
237fead6 | 262 | lower_inode = lower_dentry->d_inode; |
addd65ad | 263 | fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); |
b7ab39f6 | 264 | BUG_ON(!lower_dentry->d_count); |
addd65ad | 265 | ecryptfs_set_dentry_private(ecryptfs_dentry, |
237fead6 | 266 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
e94b1766 | 267 | GFP_KERNEL)); |
addd65ad | 268 | if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { |
237fead6 | 269 | rc = -ENOMEM; |
addd65ad MH |
270 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
271 | "to allocate ecryptfs_dentry_info struct\n", | |
272 | __func__); | |
31f73bee | 273 | goto out_put; |
237fead6 | 274 | } |
addd65ad MH |
275 | ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); |
276 | ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); | |
237fead6 MH |
277 | if (!lower_dentry->d_inode) { |
278 | /* We want to add because we couldn't find in lower */ | |
addd65ad | 279 | d_add(ecryptfs_dentry, NULL); |
237fead6 MH |
280 | goto out; |
281 | } | |
addd65ad | 282 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
3469b573 EZ |
283 | ecryptfs_dir_inode->i_sb, |
284 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); | |
237fead6 | 285 | if (rc) { |
addd65ad MH |
286 | printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", |
287 | __func__, rc); | |
391b52f9 | 288 | goto out; |
237fead6 | 289 | } |
addd65ad | 290 | if (S_ISDIR(lower_inode->i_mode)) |
237fead6 | 291 | goto out; |
addd65ad | 292 | if (S_ISLNK(lower_inode->i_mode)) |
237fead6 | 293 | goto out; |
addd65ad | 294 | if (special_file(lower_inode->i_mode)) |
202a21d6 | 295 | goto out; |
237fead6 | 296 | /* Released in this function */ |
addd65ad | 297 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); |
237fead6 | 298 | if (!page_virt) { |
addd65ad MH |
299 | printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", |
300 | __func__); | |
237fead6 | 301 | rc = -ENOMEM; |
391b52f9 | 302 | goto out; |
237fead6 | 303 | } |
27992890 RS |
304 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); |
305 | if (rc) { | |
306 | printk(KERN_ERR "%s: Error attempting to initialize " | |
307 | "the persistent file for the dentry with name " | |
308 | "[%s]; rc = [%d]\n", __func__, | |
309 | ecryptfs_dentry->d_name.name, rc); | |
310 | goto out_free_kmem; | |
391b52f9 | 311 | } |
2aac0cf8 TH |
312 | crypt_stat = &ecryptfs_inode_to_private( |
313 | ecryptfs_dentry->d_inode)->crypt_stat; | |
314 | /* TODO: lock for crypt_stat comparison */ | |
315 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
316 | ecryptfs_set_default_sizes(crypt_stat); | |
d7cdc5fe | 317 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
addd65ad | 318 | ecryptfs_dentry->d_inode); |
237fead6 | 319 | if (rc) { |
1984c23f | 320 | memset(page_virt, 0, PAGE_CACHE_SIZE); |
addd65ad MH |
321 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, |
322 | ecryptfs_dentry); | |
dd2a3b7a | 323 | if (rc) { |
dd2a3b7a | 324 | rc = 0; |
addd65ad | 325 | goto out_free_kmem; |
237fead6 | 326 | } |
dd2a3b7a | 327 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 328 | } |
e77a56dd | 329 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
addd65ad | 330 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
e77a56dd MH |
331 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { |
332 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
fa3ef1cb | 333 | file_size = (crypt_stat->metadata_size |
e77a56dd MH |
334 | + i_size_read(lower_dentry->d_inode)); |
335 | else | |
336 | file_size = i_size_read(lower_dentry->d_inode); | |
337 | } else { | |
0a688ad7 | 338 | file_size = get_unaligned_be64(page_virt); |
e77a56dd | 339 | } |
addd65ad MH |
340 | i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); |
341 | out_free_kmem: | |
237fead6 MH |
342 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
343 | goto out; | |
31f73bee | 344 | out_put: |
237fead6 | 345 | dput(lower_dentry); |
31f73bee | 346 | mntput(lower_mnt); |
addd65ad MH |
347 | d_drop(ecryptfs_dentry); |
348 | out: | |
349 | return rc; | |
350 | } | |
351 | ||
352 | /** | |
353 | * ecryptfs_lookup | |
354 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
355 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
356 | * @ecryptfs_nd: nameidata; may be NULL | |
357 | * | |
358 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
359 | * dentry cache and continue on to read it from the disk. | |
360 | */ | |
361 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
362 | struct dentry *ecryptfs_dentry, | |
363 | struct nameidata *ecryptfs_nd) | |
364 | { | |
365 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 366 | size_t encrypted_and_encoded_name_size; |
addd65ad | 367 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
368 | struct dentry *lower_dir_dentry, *lower_dentry; |
369 | int rc = 0; | |
370 | ||
addd65ad MH |
371 | if ((ecryptfs_dentry->d_name.len == 1 |
372 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
373 | || (ecryptfs_dentry->d_name.len == 2 | |
374 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
375 | goto out_d_drop; | |
376 | } | |
377 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
8787c7a3 TH |
378 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
379 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, | |
380 | lower_dir_dentry, | |
381 | ecryptfs_dentry->d_name.len); | |
382 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
383 | if (IS_ERR(lower_dentry)) { |
384 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 385 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
386 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
387 | encrypted_and_encoded_name); | |
addd65ad MH |
388 | goto out_d_drop; |
389 | } | |
390 | if (lower_dentry->d_inode) | |
391 | goto lookup_and_interpose; | |
2aac0cf8 TH |
392 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
393 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
394 | if (!(mount_crypt_stat | |
395 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
addd65ad MH |
396 | goto lookup_and_interpose; |
397 | dput(lower_dentry); | |
398 | rc = ecryptfs_encrypt_and_encode_filename( | |
399 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 400 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
401 | ecryptfs_dentry->d_name.len); |
402 | if (rc) { | |
403 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
404 | "filename; rc = [%d]\n", __func__, rc); | |
405 | goto out_d_drop; | |
406 | } | |
8787c7a3 TH |
407 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
408 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, | |
409 | lower_dir_dentry, | |
410 | encrypted_and_encoded_name_size); | |
411 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); | |
addd65ad MH |
412 | if (IS_ERR(lower_dentry)) { |
413 | rc = PTR_ERR(lower_dentry); | |
8787c7a3 | 414 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
9f37622f TH |
415 | "[%d] on lower_dentry = [%s]\n", __func__, rc, |
416 | encrypted_and_encoded_name); | |
addd65ad MH |
417 | goto out_d_drop; |
418 | } | |
419 | lookup_and_interpose: | |
420 | rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, | |
70b89021 | 421 | ecryptfs_dir_inode); |
addd65ad MH |
422 | goto out; |
423 | out_d_drop: | |
424 | d_drop(ecryptfs_dentry); | |
237fead6 | 425 | out: |
addd65ad | 426 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
427 | return ERR_PTR(rc); |
428 | } | |
429 | ||
430 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
431 | struct dentry *new_dentry) | |
432 | { | |
433 | struct dentry *lower_old_dentry; | |
434 | struct dentry *lower_new_dentry; | |
435 | struct dentry *lower_dir_dentry; | |
436 | u64 file_size_save; | |
437 | int rc; | |
438 | ||
439 | file_size_save = i_size_read(old_dentry->d_inode); | |
440 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
441 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
442 | dget(lower_old_dentry); | |
443 | dget(lower_new_dentry); | |
444 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
445 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
446 | lower_new_dentry); | |
447 | if (rc || !lower_new_dentry->d_inode) | |
448 | goto out_lock; | |
449 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
450 | if (rc) | |
451 | goto out_lock; | |
3a8380c0 TH |
452 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
453 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
454 | old_dentry->d_inode->i_nlink = |
455 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
456 | i_size_write(new_dentry->d_inode, file_size_save); | |
457 | out_lock: | |
458 | unlock_dir(lower_dir_dentry); | |
459 | dput(lower_new_dentry); | |
460 | dput(lower_old_dentry); | |
237fead6 MH |
461 | return rc; |
462 | } | |
463 | ||
464 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
465 | { | |
466 | int rc = 0; | |
467 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
468 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 469 | struct dentry *lower_dir_dentry; |
237fead6 | 470 | |
9c2d2056 | 471 | dget(lower_dentry); |
8dc4e373 | 472 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
473 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
474 | if (rc) { | |
ae56fb16 | 475 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
476 | goto out_unlock; |
477 | } | |
0cc72dc7 | 478 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
479 | dentry->d_inode->i_nlink = |
480 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
481 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 482 | d_drop(dentry); |
237fead6 | 483 | out_unlock: |
8dc4e373 | 484 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 485 | dput(lower_dentry); |
237fead6 MH |
486 | return rc; |
487 | } | |
488 | ||
489 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
490 | const char *symname) | |
491 | { | |
492 | int rc; | |
493 | struct dentry *lower_dentry; | |
494 | struct dentry *lower_dir_dentry; | |
237fead6 | 495 | char *encoded_symname; |
addd65ad MH |
496 | size_t encoded_symlen; |
497 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
498 | |
499 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
500 | dget(lower_dentry); | |
501 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
502 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
503 | dir->i_sb)->mount_crypt_stat; | |
504 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
505 | &encoded_symlen, | |
506 | NULL, | |
507 | mount_crypt_stat, symname, | |
508 | strlen(symname)); | |
509 | if (rc) | |
237fead6 | 510 | goto out_lock; |
237fead6 | 511 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 512 | encoded_symname); |
237fead6 MH |
513 | kfree(encoded_symname); |
514 | if (rc || !lower_dentry->d_inode) | |
515 | goto out_lock; | |
516 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
517 | if (rc) | |
518 | goto out_lock; | |
0cc72dc7 JJS |
519 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
520 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
521 | out_lock: |
522 | unlock_dir(lower_dir_dentry); | |
523 | dput(lower_dentry); | |
524 | if (!dentry->d_inode) | |
525 | d_drop(dentry); | |
526 | return rc; | |
527 | } | |
528 | ||
529 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
530 | { | |
531 | int rc; | |
532 | struct dentry *lower_dentry; | |
533 | struct dentry *lower_dir_dentry; | |
534 | ||
535 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
536 | lower_dir_dentry = lock_parent(lower_dentry); | |
537 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
538 | if (rc || !lower_dentry->d_inode) | |
539 | goto out; | |
540 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
541 | if (rc) | |
542 | goto out; | |
0cc72dc7 JJS |
543 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
544 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
545 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
546 | out: | |
547 | unlock_dir(lower_dir_dentry); | |
548 | if (!dentry->d_inode) | |
549 | d_drop(dentry); | |
550 | return rc; | |
551 | } | |
552 | ||
553 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
554 | { | |
237fead6 | 555 | struct dentry *lower_dentry; |
237fead6 | 556 | struct dentry *lower_dir_dentry; |
45ec4aba | 557 | int rc; |
237fead6 MH |
558 | |
559 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 560 | dget(dentry); |
237fead6 | 561 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 562 | dget(lower_dentry); |
237fead6 | 563 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
564 | dput(lower_dentry); |
565 | if (!rc) | |
566 | d_delete(lower_dentry); | |
0cc72dc7 | 567 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
568 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
569 | unlock_dir(lower_dir_dentry); | |
570 | if (!rc) | |
571 | d_drop(dentry); | |
45ec4aba | 572 | dput(dentry); |
237fead6 MH |
573 | return rc; |
574 | } | |
575 | ||
576 | static int | |
577 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
578 | { | |
579 | int rc; | |
580 | struct dentry *lower_dentry; | |
581 | struct dentry *lower_dir_dentry; | |
582 | ||
583 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
584 | lower_dir_dentry = lock_parent(lower_dentry); | |
585 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
586 | if (rc || !lower_dentry->d_inode) | |
587 | goto out; | |
391b52f9 | 588 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
237fead6 MH |
589 | if (rc) |
590 | goto out; | |
0cc72dc7 JJS |
591 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
592 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
593 | out: |
594 | unlock_dir(lower_dir_dentry); | |
595 | if (!dentry->d_inode) | |
596 | d_drop(dentry); | |
597 | return rc; | |
598 | } | |
599 | ||
600 | static int | |
601 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
602 | struct inode *new_dir, struct dentry *new_dentry) | |
603 | { | |
604 | int rc; | |
605 | struct dentry *lower_old_dentry; | |
606 | struct dentry *lower_new_dentry; | |
607 | struct dentry *lower_old_dir_dentry; | |
608 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 609 | struct dentry *trap = NULL; |
237fead6 MH |
610 | |
611 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
612 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
613 | dget(lower_old_dentry); | |
614 | dget(lower_new_dentry); | |
615 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
616 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
617 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
618 | /* source should not be ancestor of target */ | |
619 | if (trap == lower_old_dentry) { | |
620 | rc = -EINVAL; | |
621 | goto out_lock; | |
622 | } | |
623 | /* target should not be ancestor of source */ | |
624 | if (trap == lower_new_dentry) { | |
625 | rc = -ENOTEMPTY; | |
626 | goto out_lock; | |
627 | } | |
237fead6 MH |
628 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
629 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
630 | if (rc) | |
631 | goto out_lock; | |
9afa2fb6 | 632 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 633 | if (new_dir != old_dir) |
9afa2fb6 | 634 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
635 | out_lock: |
636 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
637 | dput(lower_new_dentry->d_parent); |
638 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
639 | dput(lower_new_dentry); |
640 | dput(lower_old_dentry); | |
641 | return rc; | |
642 | } | |
643 | ||
3a60a168 TH |
644 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
645 | size_t *bufsiz) | |
237fead6 | 646 | { |
3a60a168 | 647 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 648 | char *lower_buf; |
3a60a168 | 649 | size_t lower_bufsiz = PATH_MAX; |
addd65ad MH |
650 | mm_segment_t old_fs; |
651 | int rc; | |
237fead6 | 652 | |
3a6b42ca | 653 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
3a60a168 | 654 | if (!lower_buf) { |
237fead6 MH |
655 | rc = -ENOMEM; |
656 | goto out; | |
657 | } | |
658 | old_fs = get_fs(); | |
659 | set_fs(get_ds()); | |
237fead6 MH |
660 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
661 | (char __user *)lower_buf, | |
3a6b42ca | 662 | lower_bufsiz); |
237fead6 | 663 | set_fs(old_fs); |
3a60a168 TH |
664 | if (rc < 0) |
665 | goto out; | |
666 | lower_bufsiz = rc; | |
667 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, | |
668 | lower_buf, lower_bufsiz); | |
669 | out: | |
237fead6 | 670 | kfree(lower_buf); |
3a60a168 TH |
671 | return rc; |
672 | } | |
673 | ||
674 | static int | |
675 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) | |
676 | { | |
677 | char *kbuf; | |
678 | size_t kbufsiz, copied; | |
679 | int rc; | |
680 | ||
681 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); | |
682 | if (rc) | |
683 | goto out; | |
684 | copied = min_t(size_t, bufsiz, kbufsiz); | |
685 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; | |
686 | kfree(kbuf); | |
687 | fsstack_copy_attr_atime(dentry->d_inode, | |
688 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
237fead6 MH |
689 | out: |
690 | return rc; | |
691 | } | |
692 | ||
693 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
694 | { | |
695 | char *buf; | |
696 | int len = PAGE_SIZE, rc; | |
697 | mm_segment_t old_fs; | |
698 | ||
699 | /* Released in ecryptfs_put_link(); only release here on error */ | |
700 | buf = kmalloc(len, GFP_KERNEL); | |
701 | if (!buf) { | |
806892e9 | 702 | buf = ERR_PTR(-ENOMEM); |
237fead6 MH |
703 | goto out; |
704 | } | |
705 | old_fs = get_fs(); | |
706 | set_fs(get_ds()); | |
237fead6 | 707 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
237fead6 | 708 | set_fs(old_fs); |
806892e9 OH |
709 | if (rc < 0) { |
710 | kfree(buf); | |
711 | buf = ERR_PTR(rc); | |
712 | } else | |
a17d5232 | 713 | buf[rc] = '\0'; |
237fead6 | 714 | out: |
806892e9 OH |
715 | nd_set_link(nd, buf); |
716 | return NULL; | |
237fead6 MH |
717 | } |
718 | ||
719 | static void | |
720 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
721 | { | |
806892e9 OH |
722 | char *buf = nd_get_link(nd); |
723 | if (!IS_ERR(buf)) { | |
724 | /* Free the char* */ | |
725 | kfree(buf); | |
726 | } | |
237fead6 MH |
727 | } |
728 | ||
729 | /** | |
730 | * upper_size_to_lower_size | |
731 | * @crypt_stat: Crypt_stat associated with file | |
732 | * @upper_size: Size of the upper file | |
733 | * | |
cc11beff | 734 | * Calculate the required size of the lower file based on the |
237fead6 MH |
735 | * specified size of the upper file. This calculation is based on the |
736 | * number of headers in the underlying file and the extent size. | |
737 | * | |
738 | * Returns Calculated size of the lower file. | |
739 | */ | |
740 | static loff_t | |
741 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
742 | loff_t upper_size) | |
743 | { | |
744 | loff_t lower_size; | |
745 | ||
157f1071 | 746 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
747 | if (upper_size != 0) { |
748 | loff_t num_extents; | |
749 | ||
750 | num_extents = upper_size >> crypt_stat->extent_shift; | |
751 | if (upper_size & ~crypt_stat->extent_mask) | |
752 | num_extents++; | |
753 | lower_size += (num_extents * crypt_stat->extent_size); | |
754 | } | |
755 | return lower_size; | |
756 | } | |
757 | ||
758 | /** | |
5f3ef64f | 759 | * truncate_upper |
237fead6 | 760 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
761 | * @ia: Address of the ecryptfs inode's attributes |
762 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
763 | * |
764 | * Function to handle truncations modifying the size of the file. Note | |
765 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
766 | * writing strings of 0's out. When truncating, we truncate the upper |
767 | * inode and update the lower_ia according to the page index | |
768 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
769 | * the caller must use lower_ia in a call to notify_change() to perform | |
770 | * the truncation of the lower inode. | |
237fead6 MH |
771 | * |
772 | * Returns zero on success; non-zero otherwise | |
773 | */ | |
5f3ef64f TH |
774 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
775 | struct iattr *lower_ia) | |
237fead6 MH |
776 | { |
777 | int rc = 0; | |
778 | struct inode *inode = dentry->d_inode; | |
237fead6 MH |
779 | struct ecryptfs_crypt_stat *crypt_stat; |
780 | loff_t i_size = i_size_read(inode); | |
781 | loff_t lower_size_before_truncate; | |
782 | loff_t lower_size_after_truncate; | |
783 | ||
5f3ef64f TH |
784 | if (unlikely((ia->ia_size == i_size))) { |
785 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 786 | goto out; |
5f3ef64f | 787 | } |
237fead6 | 788 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
237fead6 | 789 | /* Switch on growing or shrinking file */ |
5f3ef64f | 790 | if (ia->ia_size > i_size) { |
2ed92554 MH |
791 | char zero[] = { 0x00 }; |
792 | ||
5f3ef64f | 793 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
794 | /* Write a single 0 at the last position of the file; |
795 | * this triggers code that will fill in 0's throughout | |
796 | * the intermediate portion of the previous end of the | |
797 | * file and the new and of the file */ | |
48c1e44a | 798 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
799 | (ia->ia_size - 1), 1); |
800 | } else { /* ia->ia_size < i_size_read(inode) */ | |
801 | /* We're chopping off all the pages down to the page | |
802 | * in which ia->ia_size is located. Fill in the end of | |
803 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
804 | * PAGE_CACHE_SIZE with zeros. */ |
805 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 806 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 807 | |
2c27c65e CH |
808 | |
809 | /* | |
810 | * XXX(truncate) this should really happen at the begginning | |
811 | * of ->setattr. But the code is too messy to that as part | |
812 | * of a larger patch. ecryptfs is also totally missing out | |
813 | * on the inode_change_ok check at the beginning of | |
814 | * ->setattr while would include this. | |
815 | */ | |
816 | rc = inode_newsize_ok(inode, ia->ia_size); | |
817 | if (rc) | |
818 | goto out; | |
819 | ||
13a791b4 | 820 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 821 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
822 | lower_ia->ia_size = ia->ia_size; |
823 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 824 | goto out; |
13a791b4 | 825 | } |
2ed92554 MH |
826 | if (num_zeros) { |
827 | char *zeros_virt; | |
828 | ||
829 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
830 | if (!zeros_virt) { | |
831 | rc = -ENOMEM; | |
48c1e44a | 832 | goto out; |
2ed92554 | 833 | } |
48c1e44a | 834 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 835 | ia->ia_size, num_zeros); |
2ed92554 | 836 | kfree(zeros_virt); |
5dda6992 | 837 | if (rc) { |
240e2df5 MH |
838 | printk(KERN_ERR "Error attempting to zero out " |
839 | "the remainder of the end page on " | |
840 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 841 | goto out; |
240e2df5 MH |
842 | } |
843 | } | |
2c27c65e | 844 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 845 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
846 | if (rc) { |
847 | printk(KERN_ERR "Problem with " | |
848 | "ecryptfs_write_inode_size_to_metadata; " | |
849 | "rc = [%d]\n", rc); | |
48c1e44a | 850 | goto out; |
dd2a3b7a | 851 | } |
237fead6 MH |
852 | /* We are reducing the size of the ecryptfs file, and need to |
853 | * know if we need to reduce the size of the lower file. */ | |
854 | lower_size_before_truncate = | |
855 | upper_size_to_lower_size(crypt_stat, i_size); | |
856 | lower_size_after_truncate = | |
5f3ef64f TH |
857 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
858 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
859 | lower_ia->ia_size = lower_size_after_truncate; | |
860 | lower_ia->ia_valid |= ATTR_SIZE; | |
861 | } else | |
862 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 863 | } |
237fead6 MH |
864 | out: |
865 | return rc; | |
866 | } | |
867 | ||
5f3ef64f TH |
868 | /** |
869 | * ecryptfs_truncate | |
870 | * @dentry: The ecryptfs layer dentry | |
871 | * @new_length: The length to expand the file to | |
872 | * | |
873 | * Simple function that handles the truncation of an eCryptfs inode and | |
874 | * its corresponding lower inode. | |
875 | * | |
876 | * Returns zero on success; non-zero otherwise | |
877 | */ | |
878 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
879 | { | |
880 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
881 | struct iattr lower_ia = { .ia_valid = 0 }; | |
882 | int rc; | |
883 | ||
884 | rc = truncate_upper(dentry, &ia, &lower_ia); | |
885 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
886 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
887 | ||
888 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
889 | rc = notify_change(lower_dentry, &lower_ia); | |
890 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
891 | } | |
892 | return rc; | |
893 | } | |
894 | ||
237fead6 | 895 | static int |
b74c79e9 | 896 | ecryptfs_permission(struct inode *inode, int mask, unsigned int flags) |
237fead6 | 897 | { |
b74c79e9 NP |
898 | if (flags & IPERM_FLAG_RCU) |
899 | return -ECHILD; | |
f419a2e3 | 900 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
901 | } |
902 | ||
903 | /** | |
904 | * ecryptfs_setattr | |
905 | * @dentry: dentry handle to the inode to modify | |
906 | * @ia: Structure with flags of what to change and values | |
907 | * | |
908 | * Updates the metadata of an inode. If the update is to the size | |
909 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
910 | * of both the ecryptfs inode and the lower inode. | |
911 | * | |
912 | * All other metadata changes will be passed right to the lower filesystem, | |
913 | * and we will just update our inode to look like the lower. | |
914 | */ | |
915 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
916 | { | |
917 | int rc = 0; | |
918 | struct dentry *lower_dentry; | |
5f3ef64f | 919 | struct iattr lower_ia; |
237fead6 MH |
920 | struct inode *inode; |
921 | struct inode *lower_inode; | |
922 | struct ecryptfs_crypt_stat *crypt_stat; | |
923 | ||
924 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
925 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
926 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
927 | inode = dentry->d_inode; |
928 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
929 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
930 | mutex_lock(&crypt_stat->cs_mutex); | |
931 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
932 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
933 | else if (S_ISREG(dentry->d_inode->i_mode) |
934 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
935 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 936 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 937 | |
e10f281b MH |
938 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
939 | dentry->d_sb)->mount_crypt_stat; | |
d7cdc5fe | 940 | rc = ecryptfs_read_metadata(dentry); |
5dda6992 | 941 | if (rc) { |
e10f281b MH |
942 | if (!(mount_crypt_stat->flags |
943 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
944 | rc = -EIO; | |
25bd8174 | 945 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 946 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
947 | "or the key could not be retrieved. " |
948 | "Plaintext passthrough mode is not " | |
e10f281b | 949 | "enabled; returning -EIO\n"); |
e10f281b | 950 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
951 | goto out; |
952 | } | |
953 | rc = 0; | |
954 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
e10f281b | 955 | } |
e10f281b MH |
956 | } |
957 | mutex_unlock(&crypt_stat->cs_mutex); | |
5f3ef64f TH |
958 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
959 | if (ia->ia_valid & ATTR_FILE) | |
960 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 961 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 962 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
963 | if (rc < 0) |
964 | goto out; | |
965 | } | |
1ac564ec JL |
966 | |
967 | /* | |
968 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
969 | * to interpret this in its own way. | |
970 | */ | |
5f3ef64f TH |
971 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
972 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 973 | |
9c3580aa | 974 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 975 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 976 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 977 | out: |
9afa2fb6 | 978 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
979 | return rc; |
980 | } | |
981 | ||
3a60a168 TH |
982 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
983 | struct kstat *stat) | |
984 | { | |
985 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
986 | int rc = 0; | |
987 | ||
988 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
989 | dentry->d_sb)->mount_crypt_stat; | |
990 | generic_fillattr(dentry->d_inode, stat); | |
991 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
992 | char *target; | |
993 | size_t targetsiz; | |
994 | ||
995 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
996 | if (!rc) { | |
997 | kfree(target); | |
998 | stat->size = targetsiz; | |
999 | } | |
1000 | } | |
1001 | return rc; | |
1002 | } | |
1003 | ||
f8f484d1 TH |
1004 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1005 | struct kstat *stat) | |
1006 | { | |
1007 | struct kstat lower_stat; | |
1008 | int rc; | |
1009 | ||
1010 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1011 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1012 | if (!rc) { | |
55f9cf6b TH |
1013 | fsstack_copy_attr_all(dentry->d_inode, |
1014 | ecryptfs_inode_to_lower(dentry->d_inode)); | |
f8f484d1 TH |
1015 | generic_fillattr(dentry->d_inode, stat); |
1016 | stat->blocks = lower_stat.blocks; | |
1017 | } | |
1018 | return rc; | |
1019 | } | |
1020 | ||
dd2a3b7a | 1021 | int |
237fead6 MH |
1022 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1023 | size_t size, int flags) | |
1024 | { | |
1025 | int rc = 0; | |
1026 | struct dentry *lower_dentry; | |
1027 | ||
1028 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1029 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1030 | rc = -EOPNOTSUPP; |
237fead6 MH |
1031 | goto out; |
1032 | } | |
48b512e6 RS |
1033 | |
1034 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); | |
237fead6 MH |
1035 | out: |
1036 | return rc; | |
1037 | } | |
1038 | ||
d7cdc5fe MH |
1039 | ssize_t |
1040 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1041 | void *value, size_t size) | |
1042 | { | |
1043 | int rc = 0; | |
1044 | ||
1045 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1046 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1047 | goto out; |
1048 | } | |
1049 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1050 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1051 | size); | |
1052 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1053 | out: | |
1054 | return rc; | |
1055 | } | |
1056 | ||
7896b631 | 1057 | static ssize_t |
237fead6 MH |
1058 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1059 | size_t size) | |
1060 | { | |
2ed92554 MH |
1061 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1062 | value, size); | |
237fead6 MH |
1063 | } |
1064 | ||
1065 | static ssize_t | |
1066 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1067 | { | |
1068 | int rc = 0; | |
1069 | struct dentry *lower_dentry; | |
1070 | ||
1071 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1072 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1073 | rc = -EOPNOTSUPP; |
237fead6 MH |
1074 | goto out; |
1075 | } | |
1076 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1077 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1078 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1079 | out: | |
1080 | return rc; | |
1081 | } | |
1082 | ||
1083 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
1084 | { | |
1085 | int rc = 0; | |
1086 | struct dentry *lower_dentry; | |
1087 | ||
1088 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1089 | if (!lower_dentry->d_inode->i_op->removexattr) { | |
cfce08c6 | 1090 | rc = -EOPNOTSUPP; |
237fead6 MH |
1091 | goto out; |
1092 | } | |
1093 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1094 | rc = lower_dentry->d_inode->i_op->removexattr(lower_dentry, name); | |
1095 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1096 | out: | |
1097 | return rc; | |
1098 | } | |
1099 | ||
1100 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1101 | { | |
1102 | if ((ecryptfs_inode_to_lower(inode) | |
1103 | == (struct inode *)candidate_lower_inode)) | |
1104 | return 1; | |
1105 | else | |
1106 | return 0; | |
1107 | } | |
1108 | ||
1109 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1110 | { | |
1111 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1112 | return 0; | |
1113 | } | |
1114 | ||
754661f1 | 1115 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1116 | .readlink = ecryptfs_readlink, |
1117 | .follow_link = ecryptfs_follow_link, | |
1118 | .put_link = ecryptfs_put_link, | |
1119 | .permission = ecryptfs_permission, | |
1120 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1121 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
1122 | .setxattr = ecryptfs_setxattr, |
1123 | .getxattr = ecryptfs_getxattr, | |
1124 | .listxattr = ecryptfs_listxattr, | |
1125 | .removexattr = ecryptfs_removexattr | |
1126 | }; | |
1127 | ||
754661f1 | 1128 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1129 | .create = ecryptfs_create, |
1130 | .lookup = ecryptfs_lookup, | |
1131 | .link = ecryptfs_link, | |
1132 | .unlink = ecryptfs_unlink, | |
1133 | .symlink = ecryptfs_symlink, | |
1134 | .mkdir = ecryptfs_mkdir, | |
1135 | .rmdir = ecryptfs_rmdir, | |
1136 | .mknod = ecryptfs_mknod, | |
1137 | .rename = ecryptfs_rename, | |
1138 | .permission = ecryptfs_permission, | |
1139 | .setattr = ecryptfs_setattr, | |
1140 | .setxattr = ecryptfs_setxattr, | |
1141 | .getxattr = ecryptfs_getxattr, | |
1142 | .listxattr = ecryptfs_listxattr, | |
1143 | .removexattr = ecryptfs_removexattr | |
1144 | }; | |
1145 | ||
754661f1 | 1146 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1147 | .permission = ecryptfs_permission, |
1148 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1149 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1150 | .setxattr = ecryptfs_setxattr, |
1151 | .getxattr = ecryptfs_getxattr, | |
1152 | .listxattr = ecryptfs_listxattr, | |
1153 | .removexattr = ecryptfs_removexattr | |
1154 | }; |