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> |
0a688ad7 | 34 | #include <asm/unaligned.h> |
237fead6 MH |
35 | #include "ecryptfs_kernel.h" |
36 | ||
37 | static struct dentry *lock_parent(struct dentry *dentry) | |
38 | { | |
39 | struct dentry *dir; | |
40 | ||
8dc4e373 | 41 | dir = dget_parent(dentry); |
908e0a8a | 42 | mutex_lock_nested(&(dir->d_inode->i_mutex), I_MUTEX_PARENT); |
237fead6 MH |
43 | return dir; |
44 | } | |
45 | ||
237fead6 MH |
46 | static void unlock_dir(struct dentry *dir) |
47 | { | |
48 | mutex_unlock(&dir->d_inode->i_mutex); | |
49 | dput(dir); | |
50 | } | |
51 | ||
237fead6 MH |
52 | /** |
53 | * ecryptfs_create_underlying_file | |
54 | * @lower_dir_inode: inode of the parent in the lower fs of the new file | |
f70f582f | 55 | * @dentry: New file's dentry |
237fead6 MH |
56 | * @mode: The mode of the new file |
57 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
58 | * | |
59 | * Creates the file in the lower file system. | |
60 | * | |
61 | * Returns zero on success; non-zero on error condition | |
62 | */ | |
63 | static int | |
64 | ecryptfs_create_underlying_file(struct inode *lower_dir_inode, | |
65 | struct dentry *dentry, int mode, | |
66 | struct nameidata *nd) | |
67 | { | |
68 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
69 | struct vfsmount *lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry); | |
70 | struct dentry *dentry_save; | |
71 | struct vfsmount *vfsmount_save; | |
72 | int rc; | |
73 | ||
4ac91378 JB |
74 | dentry_save = nd->path.dentry; |
75 | vfsmount_save = nd->path.mnt; | |
76 | nd->path.dentry = lower_dentry; | |
77 | nd->path.mnt = lower_mnt; | |
237fead6 | 78 | rc = vfs_create(lower_dir_inode, lower_dentry, mode, nd); |
4ac91378 JB |
79 | nd->path.dentry = dentry_save; |
80 | nd->path.mnt = vfsmount_save; | |
237fead6 MH |
81 | return rc; |
82 | } | |
83 | ||
84 | /** | |
85 | * ecryptfs_do_create | |
86 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
87 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
88 | * @mode: The mode of the new file | |
89 | * @nd: nameidata of ecryptfs' parent's dentry & vfsmount | |
90 | * | |
91 | * Creates the underlying file and the eCryptfs inode which will link to | |
92 | * it. It will also update the eCryptfs directory inode to mimic the | |
93 | * stat of the lower directory inode. | |
94 | * | |
95 | * Returns zero on success; non-zero on error condition | |
96 | */ | |
97 | static int | |
98 | ecryptfs_do_create(struct inode *directory_inode, | |
99 | struct dentry *ecryptfs_dentry, int mode, | |
100 | struct nameidata *nd) | |
101 | { | |
102 | int rc; | |
103 | struct dentry *lower_dentry; | |
104 | struct dentry *lower_dir_dentry; | |
105 | ||
106 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
107 | lower_dir_dentry = lock_parent(lower_dentry); | |
801678c5 | 108 | if (IS_ERR(lower_dir_dentry)) { |
237fead6 MH |
109 | ecryptfs_printk(KERN_ERR, "Error locking directory of " |
110 | "dentry\n"); | |
111 | rc = PTR_ERR(lower_dir_dentry); | |
112 | goto out; | |
113 | } | |
114 | rc = ecryptfs_create_underlying_file(lower_dir_dentry->d_inode, | |
115 | ecryptfs_dentry, mode, nd); | |
4981e081 | 116 | if (rc) { |
caeeeecf | 117 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 118 | "rc = [%d]\n", __func__, rc); |
caeeeecf | 119 | goto out_lock; |
237fead6 MH |
120 | } |
121 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, | |
122 | directory_inode->i_sb, 0); | |
123 | if (rc) { | |
124 | ecryptfs_printk(KERN_ERR, "Failure in ecryptfs_interpose\n"); | |
125 | goto out_lock; | |
126 | } | |
0cc72dc7 JJS |
127 | fsstack_copy_attr_times(directory_inode, lower_dir_dentry->d_inode); |
128 | fsstack_copy_inode_size(directory_inode, lower_dir_dentry->d_inode); | |
237fead6 MH |
129 | out_lock: |
130 | unlock_dir(lower_dir_dentry); | |
131 | out: | |
132 | return rc; | |
133 | } | |
134 | ||
135 | /** | |
136 | * grow_file | |
d7cdc5fe | 137 | * @ecryptfs_dentry: the eCryptfs dentry |
237fead6 MH |
138 | * |
139 | * This is the code which will grow the file to its correct size. | |
140 | */ | |
d7cdc5fe | 141 | static int grow_file(struct dentry *ecryptfs_dentry) |
237fead6 | 142 | { |
d7cdc5fe | 143 | struct inode *ecryptfs_inode = ecryptfs_dentry->d_inode; |
237fead6 MH |
144 | struct file fake_file; |
145 | struct ecryptfs_file_info tmp_file_info; | |
d7cdc5fe MH |
146 | char zero_virt[] = { 0x00 }; |
147 | int rc = 0; | |
237fead6 MH |
148 | |
149 | memset(&fake_file, 0, sizeof(fake_file)); | |
bd243a4b | 150 | fake_file.f_path.dentry = ecryptfs_dentry; |
237fead6 MH |
151 | memset(&tmp_file_info, 0, sizeof(tmp_file_info)); |
152 | ecryptfs_set_file_private(&fake_file, &tmp_file_info); | |
d7cdc5fe MH |
153 | ecryptfs_set_file_lower( |
154 | &fake_file, | |
155 | ecryptfs_inode_to_private(ecryptfs_inode)->lower_file); | |
156 | rc = ecryptfs_write(&fake_file, zero_virt, 0, 1); | |
157 | i_size_write(ecryptfs_inode, 0); | |
158 | rc = ecryptfs_write_inode_size_to_metadata(ecryptfs_inode); | |
159 | ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat.flags |= | |
160 | ECRYPTFS_NEW_FILE; | |
237fead6 MH |
161 | return rc; |
162 | } | |
163 | ||
164 | /** | |
165 | * ecryptfs_initialize_file | |
166 | * | |
167 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
168 | * file with a header and first data page. | |
169 | * | |
170 | * Returns zero on success | |
171 | */ | |
172 | static int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry) | |
173 | { | |
d7cdc5fe MH |
174 | struct ecryptfs_crypt_stat *crypt_stat = |
175 | &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; | |
237fead6 | 176 | int rc = 0; |
237fead6 | 177 | |
237fead6 MH |
178 | if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) { |
179 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); | |
e2bd99ec | 180 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 181 | goto out; |
237fead6 | 182 | } |
e2bd99ec | 183 | crypt_stat->flags |= ECRYPTFS_NEW_FILE; |
237fead6 MH |
184 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
185 | rc = ecryptfs_new_file_context(ecryptfs_dentry); | |
186 | if (rc) { | |
d7cdc5fe MH |
187 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
188 | "context; rc = [%d]\n", rc); | |
189 | goto out; | |
237fead6 | 190 | } |
391b52f9 MH |
191 | if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { |
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; | |
199 | } | |
200 | } | |
d7cdc5fe | 201 | rc = ecryptfs_write_metadata(ecryptfs_dentry); |
237fead6 | 202 | if (rc) { |
d7cdc5fe MH |
203 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
204 | goto out; | |
237fead6 | 205 | } |
d7cdc5fe | 206 | rc = grow_file(ecryptfs_dentry); |
5dda6992 | 207 | if (rc) |
d7cdc5fe | 208 | printk(KERN_ERR "Error growing file; rc = [%d]\n", rc); |
237fead6 MH |
209 | out: |
210 | return rc; | |
211 | } | |
212 | ||
213 | /** | |
214 | * ecryptfs_create | |
215 | * @dir: The inode of the directory in which to create the file. | |
216 | * @dentry: The eCryptfs dentry | |
217 | * @mode: The mode of the new file. | |
218 | * @nd: nameidata | |
219 | * | |
220 | * Creates a new file. | |
221 | * | |
222 | * Returns zero on success; non-zero on error condition | |
223 | */ | |
224 | static int | |
225 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
226 | int mode, struct nameidata *nd) | |
227 | { | |
228 | int rc; | |
229 | ||
addd65ad | 230 | /* ecryptfs_do_create() calls ecryptfs_interpose() */ |
237fead6 MH |
231 | rc = ecryptfs_do_create(directory_inode, ecryptfs_dentry, mode, nd); |
232 | if (unlikely(rc)) { | |
233 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" | |
234 | "lower filesystem\n"); | |
235 | goto out; | |
236 | } | |
237 | /* At this point, a file exists on "disk"; we need to make sure | |
238 | * that this on disk file is prepared to be an ecryptfs file */ | |
239 | rc = ecryptfs_initialize_file(ecryptfs_dentry); | |
240 | out: | |
241 | return rc; | |
242 | } | |
243 | ||
244 | /** | |
addd65ad | 245 | * ecryptfs_lookup_and_interpose_lower - Perform a lookup |
237fead6 | 246 | */ |
addd65ad MH |
247 | int ecryptfs_lookup_and_interpose_lower(struct dentry *ecryptfs_dentry, |
248 | struct dentry *lower_dentry, | |
addd65ad MH |
249 | struct inode *ecryptfs_dir_inode, |
250 | struct nameidata *ecryptfs_nd) | |
237fead6 | 251 | { |
237fead6 | 252 | struct dentry *lower_dir_dentry; |
237fead6 | 253 | struct vfsmount *lower_mnt; |
addd65ad | 254 | struct inode *lower_inode; |
e77a56dd | 255 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
2aac0cf8 | 256 | struct ecryptfs_crypt_stat *crypt_stat; |
237fead6 | 257 | char *page_virt = NULL; |
237fead6 | 258 | u64 file_size; |
addd65ad | 259 | int rc = 0; |
237fead6 | 260 | |
addd65ad MH |
261 | lower_dir_dentry = lower_dentry->d_parent; |
262 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt( | |
263 | ecryptfs_dentry->d_parent)); | |
237fead6 | 264 | lower_inode = lower_dentry->d_inode; |
addd65ad | 265 | fsstack_copy_attr_atime(ecryptfs_dir_inode, lower_dir_dentry->d_inode); |
237fead6 | 266 | BUG_ON(!atomic_read(&lower_dentry->d_count)); |
addd65ad | 267 | ecryptfs_set_dentry_private(ecryptfs_dentry, |
237fead6 | 268 | kmem_cache_alloc(ecryptfs_dentry_info_cache, |
e94b1766 | 269 | GFP_KERNEL)); |
addd65ad | 270 | if (!ecryptfs_dentry_to_private(ecryptfs_dentry)) { |
237fead6 | 271 | rc = -ENOMEM; |
addd65ad MH |
272 | printk(KERN_ERR "%s: Out of memory whilst attempting " |
273 | "to allocate ecryptfs_dentry_info struct\n", | |
274 | __func__); | |
237fead6 MH |
275 | goto out_dput; |
276 | } | |
addd65ad MH |
277 | ecryptfs_set_dentry_lower(ecryptfs_dentry, lower_dentry); |
278 | ecryptfs_set_dentry_lower_mnt(ecryptfs_dentry, lower_mnt); | |
237fead6 MH |
279 | if (!lower_dentry->d_inode) { |
280 | /* We want to add because we couldn't find in lower */ | |
addd65ad | 281 | d_add(ecryptfs_dentry, NULL); |
237fead6 MH |
282 | goto out; |
283 | } | |
addd65ad | 284 | rc = ecryptfs_interpose(lower_dentry, ecryptfs_dentry, |
3469b573 EZ |
285 | ecryptfs_dir_inode->i_sb, |
286 | ECRYPTFS_INTERPOSE_FLAG_D_ADD); | |
237fead6 | 287 | if (rc) { |
addd65ad MH |
288 | printk(KERN_ERR "%s: Error interposing; rc = [%d]\n", |
289 | __func__, rc); | |
391b52f9 | 290 | goto out; |
237fead6 | 291 | } |
addd65ad | 292 | if (S_ISDIR(lower_inode->i_mode)) |
237fead6 | 293 | goto out; |
addd65ad | 294 | if (S_ISLNK(lower_inode->i_mode)) |
237fead6 | 295 | goto out; |
addd65ad | 296 | if (special_file(lower_inode->i_mode)) |
202a21d6 | 297 | goto out; |
addd65ad | 298 | if (!ecryptfs_nd) |
237fead6 | 299 | goto out; |
237fead6 | 300 | /* Released in this function */ |
addd65ad | 301 | page_virt = kmem_cache_zalloc(ecryptfs_header_cache_2, GFP_USER); |
237fead6 | 302 | if (!page_virt) { |
addd65ad MH |
303 | printk(KERN_ERR "%s: Cannot kmem_cache_zalloc() a page\n", |
304 | __func__); | |
237fead6 | 305 | rc = -ENOMEM; |
391b52f9 | 306 | goto out; |
237fead6 | 307 | } |
addd65ad MH |
308 | if (!ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->lower_file) { |
309 | rc = ecryptfs_init_persistent_file(ecryptfs_dentry); | |
391b52f9 MH |
310 | if (rc) { |
311 | printk(KERN_ERR "%s: Error attempting to initialize " | |
312 | "the persistent file for the dentry with name " | |
313 | "[%s]; rc = [%d]\n", __func__, | |
addd65ad MH |
314 | ecryptfs_dentry->d_name.name, rc); |
315 | goto out_free_kmem; | |
391b52f9 MH |
316 | } |
317 | } | |
2aac0cf8 TH |
318 | crypt_stat = &ecryptfs_inode_to_private( |
319 | ecryptfs_dentry->d_inode)->crypt_stat; | |
320 | /* TODO: lock for crypt_stat comparison */ | |
321 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
322 | ecryptfs_set_default_sizes(crypt_stat); | |
d7cdc5fe | 323 | rc = ecryptfs_read_and_validate_header_region(page_virt, |
addd65ad | 324 | ecryptfs_dentry->d_inode); |
237fead6 | 325 | if (rc) { |
1984c23f | 326 | memset(page_virt, 0, PAGE_CACHE_SIZE); |
addd65ad MH |
327 | rc = ecryptfs_read_and_validate_xattr_region(page_virt, |
328 | ecryptfs_dentry); | |
dd2a3b7a | 329 | if (rc) { |
dd2a3b7a | 330 | rc = 0; |
addd65ad | 331 | goto out_free_kmem; |
237fead6 | 332 | } |
dd2a3b7a | 333 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; |
237fead6 | 334 | } |
e77a56dd | 335 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
addd65ad | 336 | ecryptfs_dentry->d_sb)->mount_crypt_stat; |
e77a56dd MH |
337 | if (mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED) { |
338 | if (crypt_stat->flags & ECRYPTFS_METADATA_IN_XATTR) | |
fa3ef1cb | 339 | file_size = (crypt_stat->metadata_size |
e77a56dd MH |
340 | + i_size_read(lower_dentry->d_inode)); |
341 | else | |
342 | file_size = i_size_read(lower_dentry->d_inode); | |
343 | } else { | |
0a688ad7 | 344 | file_size = get_unaligned_be64(page_virt); |
e77a56dd | 345 | } |
addd65ad MH |
346 | i_size_write(ecryptfs_dentry->d_inode, (loff_t)file_size); |
347 | out_free_kmem: | |
237fead6 MH |
348 | kmem_cache_free(ecryptfs_header_cache_2, page_virt); |
349 | goto out; | |
237fead6 MH |
350 | out_dput: |
351 | dput(lower_dentry); | |
addd65ad MH |
352 | d_drop(ecryptfs_dentry); |
353 | out: | |
354 | return rc; | |
355 | } | |
356 | ||
357 | /** | |
358 | * ecryptfs_lookup | |
359 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
360 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
361 | * @ecryptfs_nd: nameidata; may be NULL | |
362 | * | |
363 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
364 | * dentry cache and continue on to read it from the disk. | |
365 | */ | |
366 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
367 | struct dentry *ecryptfs_dentry, | |
368 | struct nameidata *ecryptfs_nd) | |
369 | { | |
370 | char *encrypted_and_encoded_name = NULL; | |
a8f12864 | 371 | size_t encrypted_and_encoded_name_size; |
addd65ad | 372 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; |
addd65ad MH |
373 | struct dentry *lower_dir_dentry, *lower_dentry; |
374 | int rc = 0; | |
375 | ||
376 | ecryptfs_dentry->d_op = &ecryptfs_dops; | |
377 | if ((ecryptfs_dentry->d_name.len == 1 | |
378 | && !strcmp(ecryptfs_dentry->d_name.name, ".")) | |
379 | || (ecryptfs_dentry->d_name.len == 2 | |
380 | && !strcmp(ecryptfs_dentry->d_name.name, ".."))) { | |
381 | goto out_d_drop; | |
382 | } | |
383 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); | |
ca8e34f2 | 384 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
addd65ad MH |
385 | lower_dentry = lookup_one_len(ecryptfs_dentry->d_name.name, |
386 | lower_dir_dentry, | |
387 | ecryptfs_dentry->d_name.len); | |
ca8e34f2 | 388 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); |
addd65ad MH |
389 | if (IS_ERR(lower_dentry)) { |
390 | rc = PTR_ERR(lower_dentry); | |
391 | printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " | |
392 | "lower_dentry = [%s]\n", __func__, rc, | |
393 | ecryptfs_dentry->d_name.name); | |
394 | goto out_d_drop; | |
395 | } | |
396 | if (lower_dentry->d_inode) | |
397 | goto lookup_and_interpose; | |
2aac0cf8 TH |
398 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
399 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
400 | if (!(mount_crypt_stat | |
401 | && (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES))) | |
addd65ad MH |
402 | goto lookup_and_interpose; |
403 | dput(lower_dentry); | |
404 | rc = ecryptfs_encrypt_and_encode_filename( | |
405 | &encrypted_and_encoded_name, &encrypted_and_encoded_name_size, | |
2aac0cf8 | 406 | NULL, mount_crypt_stat, ecryptfs_dentry->d_name.name, |
addd65ad MH |
407 | ecryptfs_dentry->d_name.len); |
408 | if (rc) { | |
409 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
410 | "filename; rc = [%d]\n", __func__, rc); | |
411 | goto out_d_drop; | |
412 | } | |
ca8e34f2 | 413 | mutex_lock(&lower_dir_dentry->d_inode->i_mutex); |
addd65ad MH |
414 | lower_dentry = lookup_one_len(encrypted_and_encoded_name, |
415 | lower_dir_dentry, | |
416 | encrypted_and_encoded_name_size - 1); | |
ca8e34f2 | 417 | mutex_unlock(&lower_dir_dentry->d_inode->i_mutex); |
addd65ad MH |
418 | if (IS_ERR(lower_dentry)) { |
419 | rc = PTR_ERR(lower_dentry); | |
420 | printk(KERN_ERR "%s: lookup_one_len() returned [%d] on " | |
421 | "lower_dentry = [%s]\n", __func__, rc, | |
422 | encrypted_and_encoded_name); | |
423 | goto out_d_drop; | |
424 | } | |
425 | lookup_and_interpose: | |
426 | rc = ecryptfs_lookup_and_interpose_lower(ecryptfs_dentry, lower_dentry, | |
2aac0cf8 | 427 | ecryptfs_dir_inode, |
addd65ad MH |
428 | ecryptfs_nd); |
429 | goto out; | |
430 | out_d_drop: | |
431 | d_drop(ecryptfs_dentry); | |
237fead6 | 432 | out: |
addd65ad | 433 | kfree(encrypted_and_encoded_name); |
237fead6 MH |
434 | return ERR_PTR(rc); |
435 | } | |
436 | ||
437 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
438 | struct dentry *new_dentry) | |
439 | { | |
440 | struct dentry *lower_old_dentry; | |
441 | struct dentry *lower_new_dentry; | |
442 | struct dentry *lower_dir_dentry; | |
443 | u64 file_size_save; | |
444 | int rc; | |
445 | ||
446 | file_size_save = i_size_read(old_dentry->d_inode); | |
447 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
448 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
449 | dget(lower_old_dentry); | |
450 | dget(lower_new_dentry); | |
451 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
452 | rc = vfs_link(lower_old_dentry, lower_dir_dentry->d_inode, | |
453 | lower_new_dentry); | |
454 | if (rc || !lower_new_dentry->d_inode) | |
455 | goto out_lock; | |
456 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb, 0); | |
457 | if (rc) | |
458 | goto out_lock; | |
3a8380c0 TH |
459 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
460 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
461 | old_dentry->d_inode->i_nlink = |
462 | ecryptfs_inode_to_lower(old_dentry->d_inode)->i_nlink; | |
463 | i_size_write(new_dentry->d_inode, file_size_save); | |
464 | out_lock: | |
465 | unlock_dir(lower_dir_dentry); | |
466 | dput(lower_new_dentry); | |
467 | dput(lower_old_dentry); | |
237fead6 MH |
468 | return rc; |
469 | } | |
470 | ||
471 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
472 | { | |
473 | int rc = 0; | |
474 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
475 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
8dc4e373 | 476 | struct dentry *lower_dir_dentry; |
237fead6 | 477 | |
9c2d2056 | 478 | dget(lower_dentry); |
8dc4e373 | 479 | lower_dir_dentry = lock_parent(lower_dentry); |
237fead6 MH |
480 | rc = vfs_unlink(lower_dir_inode, lower_dentry); |
481 | if (rc) { | |
ae56fb16 | 482 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); |
237fead6 MH |
483 | goto out_unlock; |
484 | } | |
0cc72dc7 | 485 | fsstack_copy_attr_times(dir, lower_dir_inode); |
237fead6 MH |
486 | dentry->d_inode->i_nlink = |
487 | ecryptfs_inode_to_lower(dentry->d_inode)->i_nlink; | |
488 | dentry->d_inode->i_ctime = dir->i_ctime; | |
caeeeecf | 489 | d_drop(dentry); |
237fead6 | 490 | out_unlock: |
8dc4e373 | 491 | unlock_dir(lower_dir_dentry); |
9c2d2056 | 492 | dput(lower_dentry); |
237fead6 MH |
493 | return rc; |
494 | } | |
495 | ||
496 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
497 | const char *symname) | |
498 | { | |
499 | int rc; | |
500 | struct dentry *lower_dentry; | |
501 | struct dentry *lower_dir_dentry; | |
237fead6 | 502 | char *encoded_symname; |
addd65ad MH |
503 | size_t encoded_symlen; |
504 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
505 | |
506 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
507 | dget(lower_dentry); | |
508 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
509 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
510 | dir->i_sb)->mount_crypt_stat; | |
511 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
512 | &encoded_symlen, | |
513 | NULL, | |
514 | mount_crypt_stat, symname, | |
515 | strlen(symname)); | |
516 | if (rc) | |
237fead6 | 517 | goto out_lock; |
237fead6 | 518 | rc = vfs_symlink(lower_dir_dentry->d_inode, lower_dentry, |
db2e747b | 519 | encoded_symname); |
237fead6 MH |
520 | kfree(encoded_symname); |
521 | if (rc || !lower_dentry->d_inode) | |
522 | goto out_lock; | |
523 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
524 | if (rc) | |
525 | goto out_lock; | |
0cc72dc7 JJS |
526 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
527 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
528 | out_lock: |
529 | unlock_dir(lower_dir_dentry); | |
530 | dput(lower_dentry); | |
531 | if (!dentry->d_inode) | |
532 | d_drop(dentry); | |
533 | return rc; | |
534 | } | |
535 | ||
536 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
537 | { | |
538 | int rc; | |
539 | struct dentry *lower_dentry; | |
540 | struct dentry *lower_dir_dentry; | |
541 | ||
542 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
543 | lower_dir_dentry = lock_parent(lower_dentry); | |
544 | rc = vfs_mkdir(lower_dir_dentry->d_inode, lower_dentry, mode); | |
545 | if (rc || !lower_dentry->d_inode) | |
546 | goto out; | |
547 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); | |
548 | if (rc) | |
549 | goto out; | |
0cc72dc7 JJS |
550 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
551 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
552 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
553 | out: | |
554 | unlock_dir(lower_dir_dentry); | |
555 | if (!dentry->d_inode) | |
556 | d_drop(dentry); | |
557 | return rc; | |
558 | } | |
559 | ||
560 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
561 | { | |
237fead6 | 562 | struct dentry *lower_dentry; |
237fead6 | 563 | struct dentry *lower_dir_dentry; |
45ec4aba | 564 | int rc; |
237fead6 MH |
565 | |
566 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 567 | dget(dentry); |
237fead6 | 568 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 569 | dget(lower_dentry); |
237fead6 | 570 | rc = vfs_rmdir(lower_dir_dentry->d_inode, lower_dentry); |
45ec4aba MH |
571 | dput(lower_dentry); |
572 | if (!rc) | |
573 | d_delete(lower_dentry); | |
0cc72dc7 | 574 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
237fead6 MH |
575 | dir->i_nlink = lower_dir_dentry->d_inode->i_nlink; |
576 | unlock_dir(lower_dir_dentry); | |
577 | if (!rc) | |
578 | d_drop(dentry); | |
45ec4aba | 579 | dput(dentry); |
237fead6 MH |
580 | return rc; |
581 | } | |
582 | ||
583 | static int | |
584 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
585 | { | |
586 | int rc; | |
587 | struct dentry *lower_dentry; | |
588 | struct dentry *lower_dir_dentry; | |
589 | ||
590 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
591 | lower_dir_dentry = lock_parent(lower_dentry); | |
592 | rc = vfs_mknod(lower_dir_dentry->d_inode, lower_dentry, mode, dev); | |
593 | if (rc || !lower_dentry->d_inode) | |
594 | goto out; | |
391b52f9 | 595 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb, 0); |
237fead6 MH |
596 | if (rc) |
597 | goto out; | |
0cc72dc7 JJS |
598 | fsstack_copy_attr_times(dir, lower_dir_dentry->d_inode); |
599 | fsstack_copy_inode_size(dir, lower_dir_dentry->d_inode); | |
237fead6 MH |
600 | out: |
601 | unlock_dir(lower_dir_dentry); | |
602 | if (!dentry->d_inode) | |
603 | d_drop(dentry); | |
604 | return rc; | |
605 | } | |
606 | ||
607 | static int | |
608 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
609 | struct inode *new_dir, struct dentry *new_dentry) | |
610 | { | |
611 | int rc; | |
612 | struct dentry *lower_old_dentry; | |
613 | struct dentry *lower_new_dentry; | |
614 | struct dentry *lower_old_dir_dentry; | |
615 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 616 | struct dentry *trap = NULL; |
237fead6 MH |
617 | |
618 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); | |
619 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
620 | dget(lower_old_dentry); | |
621 | dget(lower_new_dentry); | |
622 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
623 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
0d132f73 EZ |
624 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
625 | /* source should not be ancestor of target */ | |
626 | if (trap == lower_old_dentry) { | |
627 | rc = -EINVAL; | |
628 | goto out_lock; | |
629 | } | |
630 | /* target should not be ancestor of source */ | |
631 | if (trap == lower_new_dentry) { | |
632 | rc = -ENOTEMPTY; | |
633 | goto out_lock; | |
634 | } | |
237fead6 MH |
635 | rc = vfs_rename(lower_old_dir_dentry->d_inode, lower_old_dentry, |
636 | lower_new_dir_dentry->d_inode, lower_new_dentry); | |
637 | if (rc) | |
638 | goto out_lock; | |
9afa2fb6 | 639 | fsstack_copy_attr_all(new_dir, lower_new_dir_dentry->d_inode); |
237fead6 | 640 | if (new_dir != old_dir) |
9afa2fb6 | 641 | fsstack_copy_attr_all(old_dir, lower_old_dir_dentry->d_inode); |
237fead6 MH |
642 | out_lock: |
643 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
a9083081 MH |
644 | dput(lower_new_dentry->d_parent); |
645 | dput(lower_old_dentry->d_parent); | |
237fead6 MH |
646 | dput(lower_new_dentry); |
647 | dput(lower_old_dentry); | |
648 | return rc; | |
649 | } | |
650 | ||
3a60a168 TH |
651 | static int ecryptfs_readlink_lower(struct dentry *dentry, char **buf, |
652 | size_t *bufsiz) | |
237fead6 | 653 | { |
3a60a168 | 654 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
237fead6 | 655 | char *lower_buf; |
3a60a168 | 656 | size_t lower_bufsiz = PATH_MAX; |
addd65ad MH |
657 | mm_segment_t old_fs; |
658 | int rc; | |
237fead6 | 659 | |
3a6b42ca | 660 | lower_buf = kmalloc(lower_bufsiz, GFP_KERNEL); |
3a60a168 | 661 | if (!lower_buf) { |
237fead6 MH |
662 | rc = -ENOMEM; |
663 | goto out; | |
664 | } | |
665 | old_fs = get_fs(); | |
666 | set_fs(get_ds()); | |
237fead6 MH |
667 | rc = lower_dentry->d_inode->i_op->readlink(lower_dentry, |
668 | (char __user *)lower_buf, | |
3a6b42ca | 669 | lower_bufsiz); |
237fead6 | 670 | set_fs(old_fs); |
3a60a168 TH |
671 | if (rc < 0) |
672 | goto out; | |
673 | lower_bufsiz = rc; | |
674 | rc = ecryptfs_decode_and_decrypt_filename(buf, bufsiz, dentry, | |
675 | lower_buf, lower_bufsiz); | |
676 | out: | |
237fead6 | 677 | kfree(lower_buf); |
3a60a168 TH |
678 | return rc; |
679 | } | |
680 | ||
681 | static int | |
682 | ecryptfs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) | |
683 | { | |
684 | char *kbuf; | |
685 | size_t kbufsiz, copied; | |
686 | int rc; | |
687 | ||
688 | rc = ecryptfs_readlink_lower(dentry, &kbuf, &kbufsiz); | |
689 | if (rc) | |
690 | goto out; | |
691 | copied = min_t(size_t, bufsiz, kbufsiz); | |
692 | rc = copy_to_user(buf, kbuf, copied) ? -EFAULT : copied; | |
693 | kfree(kbuf); | |
694 | fsstack_copy_attr_atime(dentry->d_inode, | |
695 | ecryptfs_dentry_to_lower(dentry)->d_inode); | |
237fead6 MH |
696 | out: |
697 | return rc; | |
698 | } | |
699 | ||
700 | static void *ecryptfs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
701 | { | |
702 | char *buf; | |
703 | int len = PAGE_SIZE, rc; | |
704 | mm_segment_t old_fs; | |
705 | ||
706 | /* Released in ecryptfs_put_link(); only release here on error */ | |
707 | buf = kmalloc(len, GFP_KERNEL); | |
708 | if (!buf) { | |
806892e9 | 709 | buf = ERR_PTR(-ENOMEM); |
237fead6 MH |
710 | goto out; |
711 | } | |
712 | old_fs = get_fs(); | |
713 | set_fs(get_ds()); | |
237fead6 | 714 | rc = dentry->d_inode->i_op->readlink(dentry, (char __user *)buf, len); |
237fead6 | 715 | set_fs(old_fs); |
806892e9 OH |
716 | if (rc < 0) { |
717 | kfree(buf); | |
718 | buf = ERR_PTR(rc); | |
719 | } else | |
a17d5232 | 720 | buf[rc] = '\0'; |
237fead6 | 721 | out: |
806892e9 OH |
722 | nd_set_link(nd, buf); |
723 | return NULL; | |
237fead6 MH |
724 | } |
725 | ||
726 | static void | |
727 | ecryptfs_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr) | |
728 | { | |
806892e9 OH |
729 | char *buf = nd_get_link(nd); |
730 | if (!IS_ERR(buf)) { | |
731 | /* Free the char* */ | |
732 | kfree(buf); | |
733 | } | |
237fead6 MH |
734 | } |
735 | ||
736 | /** | |
737 | * upper_size_to_lower_size | |
738 | * @crypt_stat: Crypt_stat associated with file | |
739 | * @upper_size: Size of the upper file | |
740 | * | |
cc11beff | 741 | * Calculate the required size of the lower file based on the |
237fead6 MH |
742 | * specified size of the upper file. This calculation is based on the |
743 | * number of headers in the underlying file and the extent size. | |
744 | * | |
745 | * Returns Calculated size of the lower file. | |
746 | */ | |
747 | static loff_t | |
748 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
749 | loff_t upper_size) | |
750 | { | |
751 | loff_t lower_size; | |
752 | ||
157f1071 | 753 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
754 | if (upper_size != 0) { |
755 | loff_t num_extents; | |
756 | ||
757 | num_extents = upper_size >> crypt_stat->extent_shift; | |
758 | if (upper_size & ~crypt_stat->extent_mask) | |
759 | num_extents++; | |
760 | lower_size += (num_extents * crypt_stat->extent_size); | |
761 | } | |
762 | return lower_size; | |
763 | } | |
764 | ||
765 | /** | |
5f3ef64f | 766 | * truncate_upper |
237fead6 | 767 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
768 | * @ia: Address of the ecryptfs inode's attributes |
769 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
770 | * |
771 | * Function to handle truncations modifying the size of the file. Note | |
772 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
773 | * writing strings of 0's out. When truncating, we truncate the upper |
774 | * inode and update the lower_ia according to the page index | |
775 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
776 | * the caller must use lower_ia in a call to notify_change() to perform | |
777 | * the truncation of the lower inode. | |
237fead6 MH |
778 | * |
779 | * Returns zero on success; non-zero otherwise | |
780 | */ | |
5f3ef64f TH |
781 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
782 | struct iattr *lower_ia) | |
237fead6 MH |
783 | { |
784 | int rc = 0; | |
785 | struct inode *inode = dentry->d_inode; | |
786 | struct dentry *lower_dentry; | |
2ed92554 | 787 | struct file fake_ecryptfs_file; |
237fead6 MH |
788 | struct ecryptfs_crypt_stat *crypt_stat; |
789 | loff_t i_size = i_size_read(inode); | |
790 | loff_t lower_size_before_truncate; | |
791 | loff_t lower_size_after_truncate; | |
792 | ||
5f3ef64f TH |
793 | if (unlikely((ia->ia_size == i_size))) { |
794 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 795 | goto out; |
5f3ef64f | 796 | } |
237fead6 MH |
797 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; |
798 | /* Set up a fake ecryptfs file, this is used to interface with | |
799 | * the file in the underlying filesystem so that the | |
800 | * truncation has an effect there as well. */ | |
801 | memset(&fake_ecryptfs_file, 0, sizeof(fake_ecryptfs_file)); | |
bd243a4b | 802 | fake_ecryptfs_file.f_path.dentry = dentry; |
237fead6 MH |
803 | /* Released at out_free: label */ |
804 | ecryptfs_set_file_private(&fake_ecryptfs_file, | |
805 | kmem_cache_alloc(ecryptfs_file_info_cache, | |
e94b1766 | 806 | GFP_KERNEL)); |
237fead6 MH |
807 | if (unlikely(!ecryptfs_file_to_private(&fake_ecryptfs_file))) { |
808 | rc = -ENOMEM; | |
809 | goto out; | |
810 | } | |
811 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2ed92554 MH |
812 | ecryptfs_set_file_lower( |
813 | &fake_ecryptfs_file, | |
814 | ecryptfs_inode_to_private(dentry->d_inode)->lower_file); | |
237fead6 | 815 | /* Switch on growing or shrinking file */ |
5f3ef64f | 816 | if (ia->ia_size > i_size) { |
2ed92554 MH |
817 | char zero[] = { 0x00 }; |
818 | ||
5f3ef64f | 819 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
820 | /* Write a single 0 at the last position of the file; |
821 | * this triggers code that will fill in 0's throughout | |
822 | * the intermediate portion of the previous end of the | |
823 | * file and the new and of the file */ | |
824 | rc = ecryptfs_write(&fake_ecryptfs_file, zero, | |
5f3ef64f TH |
825 | (ia->ia_size - 1), 1); |
826 | } else { /* ia->ia_size < i_size_read(inode) */ | |
827 | /* We're chopping off all the pages down to the page | |
828 | * in which ia->ia_size is located. Fill in the end of | |
829 | * that page from (ia->ia_size & ~PAGE_CACHE_MASK) to | |
2ed92554 MH |
830 | * PAGE_CACHE_SIZE with zeros. */ |
831 | size_t num_zeros = (PAGE_CACHE_SIZE | |
5f3ef64f | 832 | - (ia->ia_size & ~PAGE_CACHE_MASK)); |
2ed92554 | 833 | |
13a791b4 | 834 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
5f3ef64f | 835 | rc = vmtruncate(inode, ia->ia_size); |
13a791b4 TH |
836 | if (rc) |
837 | goto out_free; | |
5f3ef64f TH |
838 | lower_ia->ia_size = ia->ia_size; |
839 | lower_ia->ia_valid |= ATTR_SIZE; | |
13a791b4 TH |
840 | goto out_free; |
841 | } | |
2ed92554 MH |
842 | if (num_zeros) { |
843 | char *zeros_virt; | |
844 | ||
845 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
846 | if (!zeros_virt) { | |
847 | rc = -ENOMEM; | |
848 | goto out_free; | |
849 | } | |
850 | rc = ecryptfs_write(&fake_ecryptfs_file, zeros_virt, | |
5f3ef64f | 851 | ia->ia_size, num_zeros); |
2ed92554 | 852 | kfree(zeros_virt); |
5dda6992 | 853 | if (rc) { |
240e2df5 MH |
854 | printk(KERN_ERR "Error attempting to zero out " |
855 | "the remainder of the end page on " | |
856 | "reducing truncate; rc = [%d]\n", rc); | |
2ed92554 | 857 | goto out_free; |
240e2df5 MH |
858 | } |
859 | } | |
5f3ef64f | 860 | vmtruncate(inode, ia->ia_size); |
0216f7f7 | 861 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
862 | if (rc) { |
863 | printk(KERN_ERR "Problem with " | |
864 | "ecryptfs_write_inode_size_to_metadata; " | |
865 | "rc = [%d]\n", rc); | |
2ed92554 | 866 | goto out_free; |
dd2a3b7a | 867 | } |
237fead6 MH |
868 | /* We are reducing the size of the ecryptfs file, and need to |
869 | * know if we need to reduce the size of the lower file. */ | |
870 | lower_size_before_truncate = | |
871 | upper_size_to_lower_size(crypt_stat, i_size); | |
872 | lower_size_after_truncate = | |
5f3ef64f TH |
873 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
874 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
875 | lower_ia->ia_size = lower_size_after_truncate; | |
876 | lower_ia->ia_valid |= ATTR_SIZE; | |
877 | } else | |
878 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 879 | } |
237fead6 MH |
880 | out_free: |
881 | if (ecryptfs_file_to_private(&fake_ecryptfs_file)) | |
882 | kmem_cache_free(ecryptfs_file_info_cache, | |
883 | ecryptfs_file_to_private(&fake_ecryptfs_file)); | |
884 | out: | |
885 | return rc; | |
886 | } | |
887 | ||
5f3ef64f TH |
888 | /** |
889 | * ecryptfs_truncate | |
890 | * @dentry: The ecryptfs layer dentry | |
891 | * @new_length: The length to expand the file to | |
892 | * | |
893 | * Simple function that handles the truncation of an eCryptfs inode and | |
894 | * its corresponding lower inode. | |
895 | * | |
896 | * Returns zero on success; non-zero otherwise | |
897 | */ | |
898 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
899 | { | |
900 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
901 | struct iattr lower_ia = { .ia_valid = 0 }; | |
902 | int rc; | |
903 | ||
904 | rc = truncate_upper(dentry, &ia, &lower_ia); | |
905 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
906 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
907 | ||
908 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
909 | rc = notify_change(lower_dentry, &lower_ia); | |
910 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
911 | } | |
912 | return rc; | |
913 | } | |
914 | ||
237fead6 | 915 | static int |
e6305c43 | 916 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 917 | { |
f419a2e3 | 918 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
919 | } |
920 | ||
921 | /** | |
922 | * ecryptfs_setattr | |
923 | * @dentry: dentry handle to the inode to modify | |
924 | * @ia: Structure with flags of what to change and values | |
925 | * | |
926 | * Updates the metadata of an inode. If the update is to the size | |
927 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
928 | * of both the ecryptfs inode and the lower inode. | |
929 | * | |
930 | * All other metadata changes will be passed right to the lower filesystem, | |
931 | * and we will just update our inode to look like the lower. | |
932 | */ | |
933 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
934 | { | |
935 | int rc = 0; | |
936 | struct dentry *lower_dentry; | |
5f3ef64f | 937 | struct iattr lower_ia; |
237fead6 MH |
938 | struct inode *inode; |
939 | struct inode *lower_inode; | |
940 | struct ecryptfs_crypt_stat *crypt_stat; | |
941 | ||
942 | crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat; | |
e10f281b MH |
943 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) |
944 | ecryptfs_init_crypt_stat(crypt_stat); | |
237fead6 MH |
945 | inode = dentry->d_inode; |
946 | lower_inode = ecryptfs_inode_to_lower(inode); | |
e10f281b MH |
947 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
948 | mutex_lock(&crypt_stat->cs_mutex); | |
949 | if (S_ISDIR(dentry->d_inode->i_mode)) | |
950 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
64ee4808 MH |
951 | else if (S_ISREG(dentry->d_inode->i_mode) |
952 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) | |
953 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 954 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 955 | |
e10f281b MH |
956 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
957 | dentry->d_sb)->mount_crypt_stat; | |
d7cdc5fe | 958 | rc = ecryptfs_read_metadata(dentry); |
5dda6992 | 959 | if (rc) { |
e10f281b MH |
960 | if (!(mount_crypt_stat->flags |
961 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
962 | rc = -EIO; | |
25bd8174 | 963 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 964 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
965 | "or the key could not be retrieved. " |
966 | "Plaintext passthrough mode is not " | |
e10f281b | 967 | "enabled; returning -EIO\n"); |
e10f281b | 968 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
969 | goto out; |
970 | } | |
971 | rc = 0; | |
972 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); | |
e10f281b | 973 | } |
e10f281b MH |
974 | } |
975 | mutex_unlock(&crypt_stat->cs_mutex); | |
5f3ef64f TH |
976 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
977 | if (ia->ia_valid & ATTR_FILE) | |
978 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 979 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 980 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
981 | if (rc < 0) |
982 | goto out; | |
983 | } | |
1ac564ec JL |
984 | |
985 | /* | |
986 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
987 | * to interpret this in its own way. | |
988 | */ | |
5f3ef64f TH |
989 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
990 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 991 | |
9c3580aa | 992 | mutex_lock(&lower_dentry->d_inode->i_mutex); |
5f3ef64f | 993 | rc = notify_change(lower_dentry, &lower_ia); |
9c3580aa | 994 | mutex_unlock(&lower_dentry->d_inode->i_mutex); |
237fead6 | 995 | out: |
9afa2fb6 | 996 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
997 | return rc; |
998 | } | |
999 | ||
3a60a168 TH |
1000 | int ecryptfs_getattr_link(struct vfsmount *mnt, struct dentry *dentry, |
1001 | struct kstat *stat) | |
1002 | { | |
1003 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; | |
1004 | int rc = 0; | |
1005 | ||
1006 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
1007 | dentry->d_sb)->mount_crypt_stat; | |
1008 | generic_fillattr(dentry->d_inode, stat); | |
1009 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { | |
1010 | char *target; | |
1011 | size_t targetsiz; | |
1012 | ||
1013 | rc = ecryptfs_readlink_lower(dentry, &target, &targetsiz); | |
1014 | if (!rc) { | |
1015 | kfree(target); | |
1016 | stat->size = targetsiz; | |
1017 | } | |
1018 | } | |
1019 | return rc; | |
1020 | } | |
1021 | ||
f8f484d1 TH |
1022 | int ecryptfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1023 | struct kstat *stat) | |
1024 | { | |
1025 | struct kstat lower_stat; | |
1026 | int rc; | |
1027 | ||
1028 | rc = vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentry), | |
1029 | ecryptfs_dentry_to_lower(dentry), &lower_stat); | |
1030 | if (!rc) { | |
1031 | generic_fillattr(dentry->d_inode, stat); | |
1032 | stat->blocks = lower_stat.blocks; | |
1033 | } | |
1034 | return rc; | |
1035 | } | |
1036 | ||
dd2a3b7a | 1037 | int |
237fead6 MH |
1038 | ecryptfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
1039 | size_t size, int flags) | |
1040 | { | |
1041 | int rc = 0; | |
1042 | struct dentry *lower_dentry; | |
1043 | ||
1044 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1045 | if (!lower_dentry->d_inode->i_op->setxattr) { | |
cfce08c6 | 1046 | rc = -EOPNOTSUPP; |
237fead6 MH |
1047 | goto out; |
1048 | } | |
1049 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1050 | rc = lower_dentry->d_inode->i_op->setxattr(lower_dentry, name, value, | |
1051 | size, flags); | |
1052 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1053 | out: | |
1054 | return rc; | |
1055 | } | |
1056 | ||
d7cdc5fe MH |
1057 | ssize_t |
1058 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, const char *name, | |
1059 | void *value, size_t size) | |
1060 | { | |
1061 | int rc = 0; | |
1062 | ||
1063 | if (!lower_dentry->d_inode->i_op->getxattr) { | |
cfce08c6 | 1064 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1065 | goto out; |
1066 | } | |
1067 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1068 | rc = lower_dentry->d_inode->i_op->getxattr(lower_dentry, name, value, | |
1069 | size); | |
1070 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1071 | out: | |
1072 | return rc; | |
1073 | } | |
1074 | ||
7896b631 | 1075 | static ssize_t |
237fead6 MH |
1076 | ecryptfs_getxattr(struct dentry *dentry, const char *name, void *value, |
1077 | size_t size) | |
1078 | { | |
2ed92554 MH |
1079 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), name, |
1080 | value, size); | |
237fead6 MH |
1081 | } |
1082 | ||
1083 | static ssize_t | |
1084 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1085 | { | |
1086 | int rc = 0; | |
1087 | struct dentry *lower_dentry; | |
1088 | ||
1089 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1090 | if (!lower_dentry->d_inode->i_op->listxattr) { | |
cfce08c6 | 1091 | rc = -EOPNOTSUPP; |
237fead6 MH |
1092 | goto out; |
1093 | } | |
1094 | mutex_lock(&lower_dentry->d_inode->i_mutex); | |
1095 | rc = lower_dentry->d_inode->i_op->listxattr(lower_dentry, list, size); | |
1096 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1097 | out: | |
1098 | return rc; | |
1099 | } | |
1100 | ||
1101 | static int ecryptfs_removexattr(struct dentry *dentry, const char *name) | |
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->removexattr) { | |
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->removexattr(lower_dentry, name); | |
1113 | mutex_unlock(&lower_dentry->d_inode->i_mutex); | |
1114 | out: | |
1115 | return rc; | |
1116 | } | |
1117 | ||
1118 | int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode) | |
1119 | { | |
1120 | if ((ecryptfs_inode_to_lower(inode) | |
1121 | == (struct inode *)candidate_lower_inode)) | |
1122 | return 1; | |
1123 | else | |
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | int ecryptfs_inode_set(struct inode *inode, void *lower_inode) | |
1128 | { | |
1129 | ecryptfs_init_inode(inode, (struct inode *)lower_inode); | |
1130 | return 0; | |
1131 | } | |
1132 | ||
754661f1 | 1133 | const struct inode_operations ecryptfs_symlink_iops = { |
237fead6 MH |
1134 | .readlink = ecryptfs_readlink, |
1135 | .follow_link = ecryptfs_follow_link, | |
1136 | .put_link = ecryptfs_put_link, | |
1137 | .permission = ecryptfs_permission, | |
1138 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1139 | .getattr = ecryptfs_getattr_link, |
237fead6 MH |
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_dir_iops = { |
237fead6 MH |
1147 | .create = ecryptfs_create, |
1148 | .lookup = ecryptfs_lookup, | |
1149 | .link = ecryptfs_link, | |
1150 | .unlink = ecryptfs_unlink, | |
1151 | .symlink = ecryptfs_symlink, | |
1152 | .mkdir = ecryptfs_mkdir, | |
1153 | .rmdir = ecryptfs_rmdir, | |
1154 | .mknod = ecryptfs_mknod, | |
1155 | .rename = ecryptfs_rename, | |
1156 | .permission = ecryptfs_permission, | |
1157 | .setattr = ecryptfs_setattr, | |
1158 | .setxattr = ecryptfs_setxattr, | |
1159 | .getxattr = ecryptfs_getxattr, | |
1160 | .listxattr = ecryptfs_listxattr, | |
1161 | .removexattr = ecryptfs_removexattr | |
1162 | }; | |
1163 | ||
754661f1 | 1164 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1165 | .permission = ecryptfs_permission, |
1166 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1167 | .getattr = ecryptfs_getattr, |
237fead6 MH |
1168 | .setxattr = ecryptfs_setxattr, |
1169 | .getxattr = ecryptfs_getxattr, | |
1170 | .listxattr = ecryptfs_listxattr, | |
1171 | .removexattr = ecryptfs_removexattr | |
1172 | }; |