Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
237fead6 MH |
2 | /** |
3 | * eCryptfs: Linux filesystem encryption layer | |
4 | * | |
5 | * Copyright (C) 1997-2004 Erez Zadok | |
6 | * Copyright (C) 2001-2004 Stony Brook University | |
dd2a3b7a | 7 | * Copyright (C) 2004-2007 International Business Machines Corp. |
237fead6 MH |
8 | * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com> |
9 | * Michael C. Thompsion <mcthomps@us.ibm.com> | |
237fead6 MH |
10 | */ |
11 | ||
12 | #include <linux/file.h> | |
13 | #include <linux/vmalloc.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/dcache.h> | |
16 | #include <linux/namei.h> | |
17 | #include <linux/mount.h> | |
0cc72dc7 | 18 | #include <linux/fs_stack.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
48b512e6 | 20 | #include <linux/xattr.h> |
0a688ad7 | 21 | #include <asm/unaligned.h> |
237fead6 MH |
22 | #include "ecryptfs_kernel.h" |
23 | ||
24 | static struct dentry *lock_parent(struct dentry *dentry) | |
25 | { | |
26 | struct dentry *dir; | |
27 | ||
8dc4e373 | 28 | dir = dget_parent(dentry); |
5955102c | 29 | inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); |
237fead6 MH |
30 | return dir; |
31 | } | |
32 | ||
237fead6 MH |
33 | static void unlock_dir(struct dentry *dir) |
34 | { | |
5955102c | 35 | inode_unlock(d_inode(dir)); |
237fead6 MH |
36 | dput(dir); |
37 | } | |
38 | ||
c4f79073 TH |
39 | static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) |
40 | { | |
c4cf3ba4 | 41 | return ecryptfs_inode_to_lower(inode) == lower_inode; |
c4f79073 TH |
42 | } |
43 | ||
5ccf9203 | 44 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
c4f79073 | 45 | { |
5ccf9203 TH |
46 | struct inode *lower_inode = opaque; |
47 | ||
48 | ecryptfs_set_inode_lower(inode, lower_inode); | |
49 | fsstack_copy_attr_all(inode, lower_inode); | |
50 | /* i_size will be overwritten for encrypted regular files */ | |
51 | fsstack_copy_inode_size(inode, lower_inode); | |
52 | inode->i_ino = lower_inode->i_ino; | |
c4f79073 | 53 | inode->i_mapping->a_ops = &ecryptfs_aops; |
5ccf9203 TH |
54 | |
55 | if (S_ISLNK(inode->i_mode)) | |
56 | inode->i_op = &ecryptfs_symlink_iops; | |
57 | else if (S_ISDIR(inode->i_mode)) | |
58 | inode->i_op = &ecryptfs_dir_iops; | |
59 | else | |
60 | inode->i_op = &ecryptfs_main_iops; | |
61 | ||
62 | if (S_ISDIR(inode->i_mode)) | |
63 | inode->i_fop = &ecryptfs_dir_fops; | |
64 | else if (special_file(inode->i_mode)) | |
65 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
66 | else | |
67 | inode->i_fop = &ecryptfs_main_fops; | |
68 | ||
c4f79073 TH |
69 | return 0; |
70 | } | |
71 | ||
5ccf9203 TH |
72 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
73 | struct super_block *sb) | |
c4f79073 TH |
74 | { |
75 | struct inode *inode; | |
c4f79073 | 76 | |
5ccf9203 TH |
77 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
78 | return ERR_PTR(-EXDEV); | |
79 | if (!igrab(lower_inode)) | |
80 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
81 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
82 | ecryptfs_inode_test, ecryptfs_inode_set, | |
83 | lower_inode); | |
84 | if (!inode) { | |
c4f79073 | 85 | iput(lower_inode); |
5ccf9203 | 86 | return ERR_PTR(-EACCES); |
c4f79073 | 87 | } |
5ccf9203 | 88 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 89 | iput(lower_inode); |
5ccf9203 TH |
90 | |
91 | return inode; | |
92 | } | |
93 | ||
94 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
95 | struct super_block *sb) | |
96 | { | |
97 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
98 | ||
99 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
100 | unlock_new_inode(inode); | |
101 | ||
c4f79073 | 102 | return inode; |
c4f79073 TH |
103 | } |
104 | ||
c4f79073 TH |
105 | /** |
106 | * ecryptfs_interpose | |
107 | * @lower_dentry: Existing dentry in the lower filesystem | |
108 | * @dentry: ecryptfs' dentry | |
109 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
110 | * |
111 | * Interposes upper and lower dentries. | |
112 | * | |
113 | * Returns zero on success; non-zero otherwise | |
114 | */ | |
115 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 116 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 117 | { |
2b0143b5 | 118 | struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); |
5ccf9203 | 119 | |
c4f79073 TH |
120 | if (IS_ERR(inode)) |
121 | return PTR_ERR(inode); | |
5ccf9203 TH |
122 | d_instantiate(dentry, inode); |
123 | ||
c4f79073 TH |
124 | return 0; |
125 | } | |
126 | ||
8bc2d3cf TH |
127 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
128 | struct inode *inode) | |
129 | { | |
130 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
8bc2d3cf | 131 | struct dentry *lower_dir_dentry; |
bcf0d9d4 | 132 | struct inode *lower_dir_inode; |
8bc2d3cf TH |
133 | int rc; |
134 | ||
bcf0d9d4 AV |
135 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); |
136 | lower_dir_inode = d_inode(lower_dir_dentry); | |
137 | inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); | |
138 | dget(lower_dentry); // don't even try to make the lower negative | |
139 | if (lower_dentry->d_parent != lower_dir_dentry) | |
140 | rc = -EINVAL; | |
141 | else if (d_unhashed(lower_dentry)) | |
142 | rc = -EINVAL; | |
143 | else | |
144 | rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); | |
8bc2d3cf TH |
145 | if (rc) { |
146 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
147 | goto out_unlock; | |
148 | } | |
149 | fsstack_copy_attr_times(dir, lower_dir_inode); | |
150 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); | |
151 | inode->i_ctime = dir->i_ctime; | |
8bc2d3cf | 152 | out_unlock: |
8bc2d3cf | 153 | dput(lower_dentry); |
bcf0d9d4 AV |
154 | inode_unlock(lower_dir_inode); |
155 | if (!rc) | |
156 | d_drop(dentry); | |
8bc2d3cf TH |
157 | return rc; |
158 | } | |
159 | ||
237fead6 MH |
160 | /** |
161 | * ecryptfs_do_create | |
162 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
163 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
164 | * @mode: The mode of the new file | |
237fead6 MH |
165 | * |
166 | * Creates the underlying file and the eCryptfs inode which will link to | |
167 | * it. It will also update the eCryptfs directory inode to mimic the | |
168 | * stat of the lower directory inode. | |
169 | * | |
b59db43a | 170 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 171 | */ |
b59db43a | 172 | static struct inode * |
237fead6 | 173 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 174 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
175 | { |
176 | int rc; | |
177 | struct dentry *lower_dentry; | |
178 | struct dentry *lower_dir_dentry; | |
b59db43a | 179 | struct inode *inode; |
237fead6 MH |
180 | |
181 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
182 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 | 183 | rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); |
4981e081 | 184 | if (rc) { |
caeeeecf | 185 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 186 | "rc = [%d]\n", __func__, rc); |
b59db43a | 187 | inode = ERR_PTR(rc); |
caeeeecf | 188 | goto out_lock; |
237fead6 | 189 | } |
2b0143b5 | 190 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
b59db43a | 191 | directory_inode->i_sb); |
8bc2d3cf | 192 | if (IS_ERR(inode)) { |
2b0143b5 | 193 | vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); |
237fead6 | 194 | goto out_lock; |
8bc2d3cf | 195 | } |
2b0143b5 DH |
196 | fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); |
197 | fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); | |
237fead6 MH |
198 | out_lock: |
199 | unlock_dir(lower_dir_dentry); | |
b59db43a | 200 | return inode; |
237fead6 MH |
201 | } |
202 | ||
237fead6 MH |
203 | /** |
204 | * ecryptfs_initialize_file | |
205 | * | |
206 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
207 | * file with a header and first data page. | |
208 | * | |
209 | * Returns zero on success | |
210 | */ | |
e3ccaa97 TH |
211 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
212 | struct inode *ecryptfs_inode) | |
237fead6 | 213 | { |
d7cdc5fe | 214 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 215 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 216 | int rc = 0; |
237fead6 | 217 | |
b59db43a | 218 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 219 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 220 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 221 | goto out; |
237fead6 | 222 | } |
237fead6 | 223 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 224 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 225 | if (rc) { |
d7cdc5fe MH |
226 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
227 | "context; rc = [%d]\n", rc); | |
228 | goto out; | |
237fead6 | 229 | } |
b59db43a | 230 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
231 | if (rc) { |
232 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 233 | "the lower file for the dentry with name " |
9e78d14a DH |
234 | "[%pd]; rc = [%d]\n", __func__, |
235 | ecryptfs_dentry, rc); | |
27992890 | 236 | goto out; |
391b52f9 | 237 | } |
b59db43a | 238 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 239 | if (rc) |
d7cdc5fe | 240 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 241 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
242 | out: |
243 | return rc; | |
244 | } | |
245 | ||
246 | /** | |
247 | * ecryptfs_create | |
248 | * @dir: The inode of the directory in which to create the file. | |
249 | * @dentry: The eCryptfs dentry | |
250 | * @mode: The mode of the new file. | |
237fead6 MH |
251 | * |
252 | * Creates a new file. | |
253 | * | |
254 | * Returns zero on success; non-zero on error condition | |
255 | */ | |
256 | static int | |
257 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 258 | umode_t mode, bool excl) |
237fead6 | 259 | { |
b59db43a | 260 | struct inode *ecryptfs_inode; |
237fead6 MH |
261 | int rc; |
262 | ||
b59db43a TH |
263 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
264 | mode); | |
a1c83681 | 265 | if (IS_ERR(ecryptfs_inode)) { |
237fead6 MH |
266 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
267 | "lower filesystem\n"); | |
b59db43a | 268 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
269 | goto out; |
270 | } | |
271 | /* At this point, a file exists on "disk"; we need to make sure | |
272 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
273 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
274 | if (rc) { | |
8bc2d3cf TH |
275 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
276 | ecryptfs_inode); | |
0e81ba23 | 277 | iget_failed(ecryptfs_inode); |
b59db43a TH |
278 | goto out; |
279 | } | |
1e2e547a | 280 | d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
281 | out: |
282 | return rc; | |
283 | } | |
284 | ||
778aeb42 TH |
285 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
286 | { | |
287 | struct ecryptfs_crypt_stat *crypt_stat; | |
288 | int rc; | |
289 | ||
290 | rc = ecryptfs_get_lower_file(dentry, inode); | |
291 | if (rc) { | |
292 | printk(KERN_ERR "%s: Error attempting to initialize " | |
293 | "the lower file for the dentry with name " | |
9e78d14a DH |
294 | "[%pd]; rc = [%d]\n", __func__, |
295 | dentry, rc); | |
778aeb42 TH |
296 | return rc; |
297 | } | |
298 | ||
299 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
300 | /* TODO: lock for crypt_stat comparison */ | |
301 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
302 | ecryptfs_set_default_sizes(crypt_stat); | |
303 | ||
304 | rc = ecryptfs_read_and_validate_header_region(inode); | |
305 | ecryptfs_put_lower_file(inode); | |
306 | if (rc) { | |
307 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
308 | if (!rc) | |
309 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
310 | } | |
311 | ||
312 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
313 | return 0; | |
314 | } | |
315 | ||
237fead6 | 316 | /** |
5ccf9203 | 317 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 318 | */ |
b1168a92 AV |
319 | static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, |
320 | struct dentry *lower_dentry) | |
237fead6 | 321 | { |
762c6968 | 322 | struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent); |
e72b9dd6 | 323 | struct inode *inode, *lower_inode; |
778aeb42 | 324 | struct ecryptfs_dentry_info *dentry_info; |
778aeb42 TH |
325 | int rc = 0; |
326 | ||
778aeb42 | 327 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 328 | if (!dentry_info) { |
778aeb42 | 329 | dput(lower_dentry); |
b1168a92 | 330 | return ERR_PTR(-ENOMEM); |
237fead6 | 331 | } |
0b1d9011 | 332 | |
b1168a92 | 333 | fsstack_copy_attr_atime(d_inode(dentry->d_parent), |
762c6968 | 334 | d_inode(path->dentry)); |
84d08fa8 | 335 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
336 | |
337 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
762c6968 | 338 | dentry_info->lower_path.mnt = mntget(path->mnt); |
92dd1230 | 339 | dentry_info->lower_path.dentry = lower_dentry; |
778aeb42 | 340 | |
e72b9dd6 AV |
341 | /* |
342 | * negative dentry can go positive under us here - its parent is not | |
343 | * locked. That's OK and that could happen just as we return from | |
344 | * ecryptfs_lookup() anyway. Just need to be careful and fetch | |
345 | * ->d_inode only once - it's not stable here. | |
346 | */ | |
347 | lower_inode = READ_ONCE(lower_dentry->d_inode); | |
348 | ||
349 | if (!lower_inode) { | |
237fead6 | 350 | /* We want to add because we couldn't find in lower */ |
778aeb42 | 351 | d_add(dentry, NULL); |
b1168a92 | 352 | return NULL; |
237fead6 | 353 | } |
b1168a92 | 354 | inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); |
5ccf9203 | 355 | if (IS_ERR(inode)) { |
778aeb42 TH |
356 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
357 | __func__, PTR_ERR(inode)); | |
b1168a92 | 358 | return ERR_CAST(inode); |
391b52f9 | 359 | } |
778aeb42 TH |
360 | if (S_ISREG(inode->i_mode)) { |
361 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 362 | if (rc) { |
778aeb42 | 363 | make_bad_inode(inode); |
b1168a92 | 364 | return ERR_PTR(rc); |
237fead6 | 365 | } |
237fead6 | 366 | } |
778aeb42 | 367 | |
3b06b3eb TH |
368 | if (inode->i_state & I_NEW) |
369 | unlock_new_inode(inode); | |
b1168a92 | 370 | return d_splice_alias(inode, dentry); |
addd65ad MH |
371 | } |
372 | ||
373 | /** | |
374 | * ecryptfs_lookup | |
375 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
376 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 377 | * @flags: lookup flags |
addd65ad MH |
378 | * |
379 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
380 | * dentry cache and continue on to read it from the disk. | |
381 | */ | |
382 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
383 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 384 | unsigned int flags) |
addd65ad MH |
385 | { |
386 | char *encrypted_and_encoded_name = NULL; | |
88ae4ab9 | 387 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
addd65ad | 388 | struct dentry *lower_dir_dentry, *lower_dentry; |
88ae4ab9 AV |
389 | const char *name = ecryptfs_dentry->d_name.name; |
390 | size_t len = ecryptfs_dentry->d_name.len; | |
b1168a92 | 391 | struct dentry *res; |
addd65ad MH |
392 | int rc = 0; |
393 | ||
addd65ad | 394 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
88ae4ab9 | 395 | |
2aac0cf8 TH |
396 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
397 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
ab13a921 | 398 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
88ae4ab9 AV |
399 | rc = ecryptfs_encrypt_and_encode_filename( |
400 | &encrypted_and_encoded_name, &len, | |
401 | mount_crypt_stat, name, len); | |
402 | if (rc) { | |
403 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
404 | "filename; rc = [%d]\n", __func__, rc); | |
405 | return ERR_PTR(rc); | |
406 | } | |
407 | name = encrypted_and_encoded_name; | |
addd65ad | 408 | } |
88ae4ab9 AV |
409 | |
410 | lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); | |
addd65ad | 411 | if (IS_ERR(lower_dentry)) { |
8787c7a3 | 412 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
b1168a92 AV |
413 | "[%ld] on lower_dentry = [%s]\n", __func__, |
414 | PTR_ERR(lower_dentry), | |
88ae4ab9 | 415 | name); |
b1168a92 | 416 | res = ERR_CAST(lower_dentry); |
88ae4ab9 AV |
417 | } else { |
418 | res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); | |
addd65ad | 419 | } |
addd65ad | 420 | kfree(encrypted_and_encoded_name); |
b1168a92 | 421 | return res; |
237fead6 MH |
422 | } |
423 | ||
424 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
425 | struct dentry *new_dentry) | |
426 | { | |
427 | struct dentry *lower_old_dentry; | |
428 | struct dentry *lower_new_dentry; | |
429 | struct dentry *lower_dir_dentry; | |
430 | u64 file_size_save; | |
431 | int rc; | |
432 | ||
2b0143b5 | 433 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 MH |
434 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
435 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
436 | dget(lower_old_dentry); | |
437 | dget(lower_new_dentry); | |
438 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
2b0143b5 | 439 | rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
146a8595 | 440 | lower_new_dentry, NULL); |
2b0143b5 | 441 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 442 | goto out_lock; |
5ccf9203 | 443 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
444 | if (rc) |
445 | goto out_lock; | |
2b0143b5 DH |
446 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
447 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
448 | set_nlink(d_inode(old_dentry), | |
449 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
450 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 MH |
451 | out_lock: |
452 | unlock_dir(lower_dir_dentry); | |
453 | dput(lower_new_dentry); | |
454 | dput(lower_old_dentry); | |
237fead6 MH |
455 | return rc; |
456 | } | |
457 | ||
458 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
459 | { | |
2b0143b5 | 460 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
461 | } |
462 | ||
463 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
464 | const char *symname) | |
465 | { | |
466 | int rc; | |
467 | struct dentry *lower_dentry; | |
468 | struct dentry *lower_dir_dentry; | |
237fead6 | 469 | char *encoded_symname; |
addd65ad MH |
470 | size_t encoded_symlen; |
471 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
472 | |
473 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
474 | dget(lower_dentry); | |
475 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
476 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
477 | dir->i_sb)->mount_crypt_stat; | |
478 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
479 | &encoded_symlen, | |
addd65ad MH |
480 | mount_crypt_stat, symname, |
481 | strlen(symname)); | |
482 | if (rc) | |
237fead6 | 483 | goto out_lock; |
2b0143b5 | 484 | rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, |
db2e747b | 485 | encoded_symname); |
237fead6 | 486 | kfree(encoded_symname); |
2b0143b5 | 487 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 488 | goto out_lock; |
5ccf9203 | 489 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
490 | if (rc) |
491 | goto out_lock; | |
2b0143b5 DH |
492 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
493 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
494 | out_lock: |
495 | unlock_dir(lower_dir_dentry); | |
496 | dput(lower_dentry); | |
2b0143b5 | 497 | if (d_really_is_negative(dentry)) |
237fead6 MH |
498 | d_drop(dentry); |
499 | return rc; | |
500 | } | |
501 | ||
18bb1db3 | 502 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
503 | { |
504 | int rc; | |
505 | struct dentry *lower_dentry; | |
506 | struct dentry *lower_dir_dentry; | |
507 | ||
508 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
509 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
510 | rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); |
511 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 512 | goto out; |
5ccf9203 | 513 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
514 | if (rc) |
515 | goto out; | |
2b0143b5 DH |
516 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
517 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
518 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
519 | out: |
520 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 521 | if (d_really_is_negative(dentry)) |
237fead6 MH |
522 | d_drop(dentry); |
523 | return rc; | |
524 | } | |
525 | ||
526 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
527 | { | |
237fead6 | 528 | struct dentry *lower_dentry; |
237fead6 | 529 | struct dentry *lower_dir_dentry; |
bcf0d9d4 | 530 | struct inode *lower_dir_inode; |
45ec4aba | 531 | int rc; |
237fead6 MH |
532 | |
533 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
bcf0d9d4 AV |
534 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); |
535 | lower_dir_inode = d_inode(lower_dir_dentry); | |
536 | ||
537 | inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); | |
538 | dget(lower_dentry); // don't even try to make the lower negative | |
539 | if (lower_dentry->d_parent != lower_dir_dentry) | |
540 | rc = -EINVAL; | |
541 | else if (d_unhashed(lower_dentry)) | |
542 | rc = -EINVAL; | |
543 | else | |
544 | rc = vfs_rmdir(lower_dir_inode, lower_dentry); | |
545 | if (!rc) { | |
2b0143b5 | 546 | clear_nlink(d_inode(dentry)); |
bcf0d9d4 AV |
547 | fsstack_copy_attr_times(dir, lower_dir_inode); |
548 | set_nlink(dir, lower_dir_inode->i_nlink); | |
549 | } | |
550 | dput(lower_dentry); | |
551 | inode_unlock(lower_dir_inode); | |
237fead6 MH |
552 | if (!rc) |
553 | d_drop(dentry); | |
237fead6 MH |
554 | return rc; |
555 | } | |
556 | ||
557 | static int | |
1a67aafb | 558 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
559 | { |
560 | int rc; | |
561 | struct dentry *lower_dentry; | |
562 | struct dentry *lower_dir_dentry; | |
563 | ||
564 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
565 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
566 | rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); |
567 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 568 | goto out; |
5ccf9203 | 569 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
570 | if (rc) |
571 | goto out; | |
2b0143b5 DH |
572 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
573 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
574 | out: |
575 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 576 | if (d_really_is_negative(dentry)) |
237fead6 MH |
577 | d_drop(dentry); |
578 | return rc; | |
579 | } | |
580 | ||
581 | static int | |
582 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
583 | struct inode *new_dir, struct dentry *new_dentry, |
584 | unsigned int flags) | |
237fead6 MH |
585 | { |
586 | int rc; | |
587 | struct dentry *lower_old_dentry; | |
588 | struct dentry *lower_new_dentry; | |
589 | struct dentry *lower_old_dir_dentry; | |
590 | struct dentry *lower_new_dir_dentry; | |
bcf0d9d4 | 591 | struct dentry *trap; |
8335eafc | 592 | struct inode *target_inode; |
237fead6 | 593 | |
1cd66c93 MS |
594 | if (flags) |
595 | return -EINVAL; | |
596 | ||
bcf0d9d4 AV |
597 | lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); |
598 | lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); | |
599 | ||
237fead6 MH |
600 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
601 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
bcf0d9d4 | 602 | |
2b0143b5 | 603 | target_inode = d_inode(new_dentry); |
bcf0d9d4 | 604 | |
0d132f73 | 605 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
bcf0d9d4 | 606 | dget(lower_new_dentry); |
74dd7c97 AV |
607 | rc = -EINVAL; |
608 | if (lower_old_dentry->d_parent != lower_old_dir_dentry) | |
609 | goto out_lock; | |
610 | if (lower_new_dentry->d_parent != lower_new_dir_dentry) | |
611 | goto out_lock; | |
612 | if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) | |
613 | goto out_lock; | |
0d132f73 | 614 | /* source should not be ancestor of target */ |
74dd7c97 | 615 | if (trap == lower_old_dentry) |
0d132f73 | 616 | goto out_lock; |
0d132f73 EZ |
617 | /* target should not be ancestor of source */ |
618 | if (trap == lower_new_dentry) { | |
619 | rc = -ENOTEMPTY; | |
620 | goto out_lock; | |
621 | } | |
2b0143b5 DH |
622 | rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
623 | d_inode(lower_new_dir_dentry), lower_new_dentry, | |
520c8b16 | 624 | NULL, 0); |
237fead6 MH |
625 | if (rc) |
626 | goto out_lock; | |
8335eafc TH |
627 | if (target_inode) |
628 | fsstack_copy_attr_all(target_inode, | |
629 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 630 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 631 | if (new_dir != old_dir) |
2b0143b5 | 632 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 | 633 | out_lock: |
237fead6 | 634 | dput(lower_new_dentry); |
bcf0d9d4 | 635 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
237fead6 MH |
636 | return rc; |
637 | } | |
638 | ||
b22e8fed | 639 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 640 | { |
6c988f57 | 641 | DEFINE_DELAYED_CALL(done); |
3a60a168 | 642 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
6c988f57 | 643 | const char *link; |
b22e8fed | 644 | char *buf; |
addd65ad | 645 | int rc; |
237fead6 | 646 | |
6c988f57 MS |
647 | link = vfs_get_link(lower_dentry, &done); |
648 | if (IS_ERR(link)) | |
649 | return ERR_CAST(link); | |
650 | ||
b22e8fed | 651 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
6c988f57 MS |
652 | link, strlen(link)); |
653 | do_delayed_call(&done); | |
654 | if (rc) | |
655 | return ERR_PTR(rc); | |
656 | ||
657 | return buf; | |
3a60a168 TH |
658 | } |
659 | ||
6b255391 | 660 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
661 | struct inode *inode, |
662 | struct delayed_call *done) | |
3a60a168 | 663 | { |
b22e8fed | 664 | size_t len; |
6b255391 AV |
665 | char *buf; |
666 | ||
667 | if (!dentry) | |
668 | return ERR_PTR(-ECHILD); | |
669 | ||
670 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 671 | if (IS_ERR(buf)) |
680baacb | 672 | return buf; |
2b0143b5 DH |
673 | fsstack_copy_attr_atime(d_inode(dentry), |
674 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 675 | buf[len] = '\0'; |
fceef393 AV |
676 | set_delayed_call(done, kfree_link, buf); |
677 | return buf; | |
237fead6 MH |
678 | } |
679 | ||
237fead6 MH |
680 | /** |
681 | * upper_size_to_lower_size | |
682 | * @crypt_stat: Crypt_stat associated with file | |
683 | * @upper_size: Size of the upper file | |
684 | * | |
cc11beff | 685 | * Calculate the required size of the lower file based on the |
237fead6 MH |
686 | * specified size of the upper file. This calculation is based on the |
687 | * number of headers in the underlying file and the extent size. | |
688 | * | |
689 | * Returns Calculated size of the lower file. | |
690 | */ | |
691 | static loff_t | |
692 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
693 | loff_t upper_size) | |
694 | { | |
695 | loff_t lower_size; | |
696 | ||
157f1071 | 697 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
698 | if (upper_size != 0) { |
699 | loff_t num_extents; | |
700 | ||
701 | num_extents = upper_size >> crypt_stat->extent_shift; | |
702 | if (upper_size & ~crypt_stat->extent_mask) | |
703 | num_extents++; | |
704 | lower_size += (num_extents * crypt_stat->extent_size); | |
705 | } | |
706 | return lower_size; | |
707 | } | |
708 | ||
709 | /** | |
5f3ef64f | 710 | * truncate_upper |
237fead6 | 711 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
712 | * @ia: Address of the ecryptfs inode's attributes |
713 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
714 | * |
715 | * Function to handle truncations modifying the size of the file. Note | |
716 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
717 | * writing strings of 0's out. When truncating, we truncate the upper |
718 | * inode and update the lower_ia according to the page index | |
719 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
720 | * the caller must use lower_ia in a call to notify_change() to perform | |
721 | * the truncation of the lower inode. | |
237fead6 MH |
722 | * |
723 | * Returns zero on success; non-zero otherwise | |
724 | */ | |
5f3ef64f TH |
725 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
726 | struct iattr *lower_ia) | |
237fead6 MH |
727 | { |
728 | int rc = 0; | |
2b0143b5 | 729 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
730 | struct ecryptfs_crypt_stat *crypt_stat; |
731 | loff_t i_size = i_size_read(inode); | |
732 | loff_t lower_size_before_truncate; | |
733 | loff_t lower_size_after_truncate; | |
734 | ||
5f3ef64f TH |
735 | if (unlikely((ia->ia_size == i_size))) { |
736 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 737 | return 0; |
5f3ef64f | 738 | } |
3b06b3eb | 739 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
740 | if (rc) |
741 | return rc; | |
2b0143b5 | 742 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 743 | /* Switch on growing or shrinking file */ |
5f3ef64f | 744 | if (ia->ia_size > i_size) { |
2ed92554 MH |
745 | char zero[] = { 0x00 }; |
746 | ||
5f3ef64f | 747 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
748 | /* Write a single 0 at the last position of the file; |
749 | * this triggers code that will fill in 0's throughout | |
750 | * the intermediate portion of the previous end of the | |
751 | * file and the new and of the file */ | |
48c1e44a | 752 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
753 | (ia->ia_size - 1), 1); |
754 | } else { /* ia->ia_size < i_size_read(inode) */ | |
755 | /* We're chopping off all the pages down to the page | |
756 | * in which ia->ia_size is located. Fill in the end of | |
ea1754a0 KS |
757 | * that page from (ia->ia_size & ~PAGE_MASK) to |
758 | * PAGE_SIZE with zeros. */ | |
09cbfeaf KS |
759 | size_t num_zeros = (PAGE_SIZE |
760 | - (ia->ia_size & ~PAGE_MASK)); | |
2ed92554 | 761 | |
13a791b4 | 762 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 763 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
764 | lower_ia->ia_size = ia->ia_size; |
765 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 766 | goto out; |
13a791b4 | 767 | } |
2ed92554 MH |
768 | if (num_zeros) { |
769 | char *zeros_virt; | |
770 | ||
771 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
772 | if (!zeros_virt) { | |
773 | rc = -ENOMEM; | |
48c1e44a | 774 | goto out; |
2ed92554 | 775 | } |
48c1e44a | 776 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 777 | ia->ia_size, num_zeros); |
2ed92554 | 778 | kfree(zeros_virt); |
5dda6992 | 779 | if (rc) { |
240e2df5 MH |
780 | printk(KERN_ERR "Error attempting to zero out " |
781 | "the remainder of the end page on " | |
782 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 783 | goto out; |
240e2df5 MH |
784 | } |
785 | } | |
2c27c65e | 786 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 787 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
788 | if (rc) { |
789 | printk(KERN_ERR "Problem with " | |
790 | "ecryptfs_write_inode_size_to_metadata; " | |
791 | "rc = [%d]\n", rc); | |
48c1e44a | 792 | goto out; |
dd2a3b7a | 793 | } |
237fead6 MH |
794 | /* We are reducing the size of the ecryptfs file, and need to |
795 | * know if we need to reduce the size of the lower file. */ | |
796 | lower_size_before_truncate = | |
797 | upper_size_to_lower_size(crypt_stat, i_size); | |
798 | lower_size_after_truncate = | |
5f3ef64f TH |
799 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
800 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
801 | lower_ia->ia_size = lower_size_after_truncate; | |
802 | lower_ia->ia_valid |= ATTR_SIZE; | |
803 | } else | |
804 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 805 | } |
237fead6 | 806 | out: |
332ab16f | 807 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
808 | return rc; |
809 | } | |
810 | ||
a261a039 TH |
811 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
812 | { | |
813 | struct ecryptfs_crypt_stat *crypt_stat; | |
814 | loff_t lower_oldsize, lower_newsize; | |
815 | ||
816 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
817 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
818 | i_size_read(inode)); | |
819 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
820 | if (lower_newsize > lower_oldsize) { | |
821 | /* | |
822 | * The eCryptfs inode and the new *lower* size are mixed here | |
823 | * because we may not have the lower i_mutex held and/or it may | |
824 | * not be appropriate to call inode_newsize_ok() with inodes | |
825 | * from other filesystems. | |
826 | */ | |
827 | return inode_newsize_ok(inode, lower_newsize); | |
828 | } | |
829 | ||
830 | return 0; | |
831 | } | |
832 | ||
5f3ef64f TH |
833 | /** |
834 | * ecryptfs_truncate | |
835 | * @dentry: The ecryptfs layer dentry | |
836 | * @new_length: The length to expand the file to | |
837 | * | |
838 | * Simple function that handles the truncation of an eCryptfs inode and | |
839 | * its corresponding lower inode. | |
840 | * | |
841 | * Returns zero on success; non-zero otherwise | |
842 | */ | |
843 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
844 | { | |
845 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
846 | struct iattr lower_ia = { .ia_valid = 0 }; | |
847 | int rc; | |
848 | ||
2b0143b5 | 849 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
850 | if (rc) |
851 | return rc; | |
852 | ||
5f3ef64f TH |
853 | rc = truncate_upper(dentry, &ia, &lower_ia); |
854 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
855 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
856 | ||
5955102c | 857 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 858 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 859 | inode_unlock(d_inode(lower_dentry)); |
5f3ef64f TH |
860 | } |
861 | return rc; | |
862 | } | |
863 | ||
237fead6 | 864 | static int |
10556cb2 | 865 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 866 | { |
f419a2e3 | 867 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
868 | } |
869 | ||
870 | /** | |
871 | * ecryptfs_setattr | |
872 | * @dentry: dentry handle to the inode to modify | |
873 | * @ia: Structure with flags of what to change and values | |
874 | * | |
875 | * Updates the metadata of an inode. If the update is to the size | |
876 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
877 | * of both the ecryptfs inode and the lower inode. | |
878 | * | |
879 | * All other metadata changes will be passed right to the lower filesystem, | |
880 | * and we will just update our inode to look like the lower. | |
881 | */ | |
882 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
883 | { | |
884 | int rc = 0; | |
885 | struct dentry *lower_dentry; | |
5f3ef64f | 886 | struct iattr lower_ia; |
237fead6 MH |
887 | struct inode *inode; |
888 | struct inode *lower_inode; | |
889 | struct ecryptfs_crypt_stat *crypt_stat; | |
890 | ||
2b0143b5 | 891 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e81f3340 HX |
892 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { |
893 | rc = ecryptfs_init_crypt_stat(crypt_stat); | |
894 | if (rc) | |
895 | return rc; | |
896 | } | |
2b0143b5 | 897 | inode = d_inode(dentry); |
237fead6 | 898 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
899 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
900 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 901 | if (d_is_dir(dentry)) |
e10f281b | 902 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 903 | else if (d_is_reg(dentry) |
64ee4808 MH |
904 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
905 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 906 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 907 | |
e10f281b MH |
908 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
909 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 910 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
911 | if (rc) { |
912 | mutex_unlock(&crypt_stat->cs_mutex); | |
913 | goto out; | |
914 | } | |
d7cdc5fe | 915 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 916 | ecryptfs_put_lower_file(inode); |
5dda6992 | 917 | if (rc) { |
e10f281b MH |
918 | if (!(mount_crypt_stat->flags |
919 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
920 | rc = -EIO; | |
25bd8174 | 921 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 922 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
923 | "or the key could not be retrieved. " |
924 | "Plaintext passthrough mode is not " | |
e10f281b | 925 | "enabled; returning -EIO\n"); |
e10f281b | 926 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
927 | goto out; |
928 | } | |
929 | rc = 0; | |
3aeb86ea TH |
930 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
931 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 932 | } |
e10f281b MH |
933 | } |
934 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 | 935 | |
31051c85 | 936 | rc = setattr_prepare(dentry, ia); |
a261a039 TH |
937 | if (rc) |
938 | goto out; | |
939 | if (ia->ia_valid & ATTR_SIZE) { | |
940 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
941 | if (rc) | |
942 | goto out; | |
943 | } | |
944 | ||
5f3ef64f TH |
945 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
946 | if (ia->ia_valid & ATTR_FILE) | |
947 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 948 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 949 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
950 | if (rc < 0) |
951 | goto out; | |
952 | } | |
1ac564ec JL |
953 | |
954 | /* | |
955 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
956 | * to interpret this in its own way. | |
957 | */ | |
5f3ef64f TH |
958 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
959 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 960 | |
5955102c | 961 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 962 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 963 | inode_unlock(d_inode(lower_dentry)); |
237fead6 | 964 | out: |
9afa2fb6 | 965 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
966 | return rc; |
967 | } | |
968 | ||
a528d35e DH |
969 | static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, |
970 | u32 request_mask, unsigned int flags) | |
3a60a168 | 971 | { |
a528d35e | 972 | struct dentry *dentry = path->dentry; |
3a60a168 TH |
973 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
974 | int rc = 0; | |
975 | ||
976 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
977 | dentry->d_sb)->mount_crypt_stat; | |
2b0143b5 | 978 | generic_fillattr(d_inode(dentry), stat); |
3a60a168 TH |
979 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
980 | char *target; | |
981 | size_t targetsiz; | |
982 | ||
b22e8fed AV |
983 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
984 | if (!IS_ERR(target)) { | |
3a60a168 TH |
985 | kfree(target); |
986 | stat->size = targetsiz; | |
b22e8fed AV |
987 | } else { |
988 | rc = PTR_ERR(target); | |
3a60a168 TH |
989 | } |
990 | } | |
991 | return rc; | |
992 | } | |
993 | ||
a528d35e DH |
994 | static int ecryptfs_getattr(const struct path *path, struct kstat *stat, |
995 | u32 request_mask, unsigned int flags) | |
f8f484d1 | 996 | { |
a528d35e | 997 | struct dentry *dentry = path->dentry; |
f8f484d1 TH |
998 | struct kstat lower_stat; |
999 | int rc; | |
1000 | ||
a528d35e DH |
1001 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, |
1002 | request_mask, flags); | |
f8f484d1 | 1003 | if (!rc) { |
2b0143b5 DH |
1004 | fsstack_copy_attr_all(d_inode(dentry), |
1005 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
1006 | generic_fillattr(d_inode(dentry), stat); | |
f8f484d1 TH |
1007 | stat->blocks = lower_stat.blocks; |
1008 | } | |
1009 | return rc; | |
1010 | } | |
1011 | ||
dd2a3b7a | 1012 | int |
3767e255 AV |
1013 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, |
1014 | const char *name, const void *value, | |
237fead6 MH |
1015 | size_t size, int flags) |
1016 | { | |
5d6c3191 | 1017 | int rc; |
237fead6 | 1018 | struct dentry *lower_dentry; |
0b964446 | 1019 | struct inode *lower_inode; |
237fead6 MH |
1020 | |
1021 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
0b964446 MS |
1022 | lower_inode = d_inode(lower_dentry); |
1023 | if (!(lower_inode->i_opflags & IOP_XATTR)) { | |
cfce08c6 | 1024 | rc = -EOPNOTSUPP; |
237fead6 MH |
1025 | goto out; |
1026 | } | |
0b964446 MS |
1027 | inode_lock(lower_inode); |
1028 | rc = __vfs_setxattr_locked(lower_dentry, name, value, size, flags, NULL); | |
1029 | inode_unlock(lower_inode); | |
3767e255 | 1030 | if (!rc && inode) |
0b964446 | 1031 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
1032 | out: |
1033 | return rc; | |
1034 | } | |
1035 | ||
d7cdc5fe | 1036 | ssize_t |
ce23e640 AV |
1037 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
1038 | const char *name, void *value, size_t size) | |
d7cdc5fe | 1039 | { |
5d6c3191 | 1040 | int rc; |
d7cdc5fe | 1041 | |
5d6c3191 | 1042 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1043 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1044 | goto out; |
1045 | } | |
ce23e640 | 1046 | inode_lock(lower_inode); |
5d6c3191 | 1047 | rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); |
ce23e640 | 1048 | inode_unlock(lower_inode); |
d7cdc5fe MH |
1049 | out: |
1050 | return rc; | |
1051 | } | |
1052 | ||
7896b631 | 1053 | static ssize_t |
ce23e640 AV |
1054 | ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, |
1055 | const char *name, void *value, size_t size) | |
237fead6 | 1056 | { |
ce23e640 AV |
1057 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), |
1058 | ecryptfs_inode_to_lower(inode), | |
1059 | name, value, size); | |
237fead6 MH |
1060 | } |
1061 | ||
1062 | static ssize_t | |
1063 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1064 | { | |
1065 | int rc = 0; | |
1066 | struct dentry *lower_dentry; | |
1067 | ||
1068 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1069 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1070 | rc = -EOPNOTSUPP; |
237fead6 MH |
1071 | goto out; |
1072 | } | |
5955102c | 1073 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1074 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
5955102c | 1075 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1076 | out: |
1077 | return rc; | |
1078 | } | |
1079 | ||
4b899da5 AG |
1080 | static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, |
1081 | const char *name) | |
237fead6 | 1082 | { |
5d6c3191 | 1083 | int rc; |
237fead6 | 1084 | struct dentry *lower_dentry; |
4b899da5 | 1085 | struct inode *lower_inode; |
237fead6 MH |
1086 | |
1087 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
4b899da5 | 1088 | lower_inode = ecryptfs_inode_to_lower(inode); |
5d6c3191 | 1089 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1090 | rc = -EOPNOTSUPP; |
237fead6 MH |
1091 | goto out; |
1092 | } | |
4b899da5 | 1093 | inode_lock(lower_inode); |
5d6c3191 | 1094 | rc = __vfs_removexattr(lower_dentry, name); |
4b899da5 | 1095 | inode_unlock(lower_inode); |
237fead6 MH |
1096 | out: |
1097 | return rc; | |
1098 | } | |
1099 | ||
754661f1 | 1100 | const struct inode_operations ecryptfs_symlink_iops = { |
6b255391 | 1101 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1102 | .permission = ecryptfs_permission, |
1103 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1104 | .getattr = ecryptfs_getattr_link, |
237fead6 | 1105 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1106 | }; |
1107 | ||
754661f1 | 1108 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1109 | .create = ecryptfs_create, |
1110 | .lookup = ecryptfs_lookup, | |
1111 | .link = ecryptfs_link, | |
1112 | .unlink = ecryptfs_unlink, | |
1113 | .symlink = ecryptfs_symlink, | |
1114 | .mkdir = ecryptfs_mkdir, | |
1115 | .rmdir = ecryptfs_rmdir, | |
1116 | .mknod = ecryptfs_mknod, | |
1117 | .rename = ecryptfs_rename, | |
1118 | .permission = ecryptfs_permission, | |
1119 | .setattr = ecryptfs_setattr, | |
237fead6 | 1120 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1121 | }; |
1122 | ||
754661f1 | 1123 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1124 | .permission = ecryptfs_permission, |
1125 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1126 | .getattr = ecryptfs_getattr, |
237fead6 | 1127 | .listxattr = ecryptfs_listxattr, |
4b899da5 AG |
1128 | }; |
1129 | ||
1130 | static int ecryptfs_xattr_get(const struct xattr_handler *handler, | |
1131 | struct dentry *dentry, struct inode *inode, | |
1132 | const char *name, void *buffer, size_t size) | |
1133 | { | |
1134 | return ecryptfs_getxattr(dentry, inode, name, buffer, size); | |
1135 | } | |
1136 | ||
1137 | static int ecryptfs_xattr_set(const struct xattr_handler *handler, | |
1138 | struct dentry *dentry, struct inode *inode, | |
1139 | const char *name, const void *value, size_t size, | |
1140 | int flags) | |
1141 | { | |
1142 | if (value) | |
1143 | return ecryptfs_setxattr(dentry, inode, name, value, size, flags); | |
1144 | else { | |
1145 | BUG_ON(flags != XATTR_REPLACE); | |
1146 | return ecryptfs_removexattr(dentry, inode, name); | |
1147 | } | |
1148 | } | |
1149 | ||
c036061b | 1150 | static const struct xattr_handler ecryptfs_xattr_handler = { |
4b899da5 AG |
1151 | .prefix = "", /* match anything */ |
1152 | .get = ecryptfs_xattr_get, | |
1153 | .set = ecryptfs_xattr_set, | |
1154 | }; | |
1155 | ||
1156 | const struct xattr_handler *ecryptfs_xattr_handlers[] = { | |
1157 | &ecryptfs_xattr_handler, | |
1158 | NULL | |
237fead6 | 1159 | }; |