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 | |
6521f891 CB |
144 | rc = vfs_unlink(&init_user_ns, lower_dir_inode, lower_dentry, |
145 | NULL); | |
8bc2d3cf TH |
146 | if (rc) { |
147 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
148 | goto out_unlock; | |
149 | } | |
150 | fsstack_copy_attr_times(dir, lower_dir_inode); | |
151 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); | |
152 | inode->i_ctime = dir->i_ctime; | |
8bc2d3cf | 153 | out_unlock: |
8bc2d3cf | 154 | dput(lower_dentry); |
bcf0d9d4 AV |
155 | inode_unlock(lower_dir_inode); |
156 | if (!rc) | |
157 | d_drop(dentry); | |
8bc2d3cf TH |
158 | return rc; |
159 | } | |
160 | ||
237fead6 MH |
161 | /** |
162 | * ecryptfs_do_create | |
163 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
164 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
165 | * @mode: The mode of the new file | |
237fead6 MH |
166 | * |
167 | * Creates the underlying file and the eCryptfs inode which will link to | |
168 | * it. It will also update the eCryptfs directory inode to mimic the | |
169 | * stat of the lower directory inode. | |
170 | * | |
b59db43a | 171 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 172 | */ |
b59db43a | 173 | static struct inode * |
237fead6 | 174 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 175 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
176 | { |
177 | int rc; | |
178 | struct dentry *lower_dentry; | |
179 | struct dentry *lower_dir_dentry; | |
b59db43a | 180 | struct inode *inode; |
237fead6 MH |
181 | |
182 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
183 | lower_dir_dentry = lock_parent(lower_dentry); | |
6521f891 CB |
184 | rc = vfs_create(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, |
185 | mode, true); | |
4981e081 | 186 | if (rc) { |
caeeeecf | 187 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 188 | "rc = [%d]\n", __func__, rc); |
b59db43a | 189 | inode = ERR_PTR(rc); |
caeeeecf | 190 | goto out_lock; |
237fead6 | 191 | } |
2b0143b5 | 192 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
b59db43a | 193 | directory_inode->i_sb); |
8bc2d3cf | 194 | if (IS_ERR(inode)) { |
6521f891 CB |
195 | vfs_unlink(&init_user_ns, d_inode(lower_dir_dentry), |
196 | lower_dentry, NULL); | |
237fead6 | 197 | goto out_lock; |
8bc2d3cf | 198 | } |
2b0143b5 DH |
199 | fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); |
200 | fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); | |
237fead6 MH |
201 | out_lock: |
202 | unlock_dir(lower_dir_dentry); | |
b59db43a | 203 | return inode; |
237fead6 MH |
204 | } |
205 | ||
237fead6 MH |
206 | /** |
207 | * ecryptfs_initialize_file | |
208 | * | |
209 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
210 | * file with a header and first data page. | |
211 | * | |
212 | * Returns zero on success | |
213 | */ | |
e3ccaa97 TH |
214 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
215 | struct inode *ecryptfs_inode) | |
237fead6 | 216 | { |
d7cdc5fe | 217 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 218 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 219 | int rc = 0; |
237fead6 | 220 | |
b59db43a | 221 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 222 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 223 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 224 | goto out; |
237fead6 | 225 | } |
237fead6 | 226 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 227 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 228 | if (rc) { |
d7cdc5fe MH |
229 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
230 | "context; rc = [%d]\n", rc); | |
231 | goto out; | |
237fead6 | 232 | } |
b59db43a | 233 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
234 | if (rc) { |
235 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 236 | "the lower file for the dentry with name " |
9e78d14a DH |
237 | "[%pd]; rc = [%d]\n", __func__, |
238 | ecryptfs_dentry, rc); | |
27992890 | 239 | goto out; |
391b52f9 | 240 | } |
b59db43a | 241 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 242 | if (rc) |
d7cdc5fe | 243 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 244 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
245 | out: |
246 | return rc; | |
247 | } | |
248 | ||
249 | /** | |
250 | * ecryptfs_create | |
251 | * @dir: The inode of the directory in which to create the file. | |
252 | * @dentry: The eCryptfs dentry | |
253 | * @mode: The mode of the new file. | |
237fead6 MH |
254 | * |
255 | * Creates a new file. | |
256 | * | |
257 | * Returns zero on success; non-zero on error condition | |
258 | */ | |
259 | static int | |
549c7297 CB |
260 | ecryptfs_create(struct user_namespace *mnt_userns, |
261 | struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 262 | umode_t mode, bool excl) |
237fead6 | 263 | { |
b59db43a | 264 | struct inode *ecryptfs_inode; |
237fead6 MH |
265 | int rc; |
266 | ||
b59db43a TH |
267 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
268 | mode); | |
a1c83681 | 269 | if (IS_ERR(ecryptfs_inode)) { |
237fead6 MH |
270 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
271 | "lower filesystem\n"); | |
b59db43a | 272 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
273 | goto out; |
274 | } | |
275 | /* At this point, a file exists on "disk"; we need to make sure | |
276 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
277 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
278 | if (rc) { | |
8bc2d3cf TH |
279 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
280 | ecryptfs_inode); | |
0e81ba23 | 281 | iget_failed(ecryptfs_inode); |
b59db43a TH |
282 | goto out; |
283 | } | |
1e2e547a | 284 | d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
285 | out: |
286 | return rc; | |
287 | } | |
288 | ||
778aeb42 TH |
289 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
290 | { | |
291 | struct ecryptfs_crypt_stat *crypt_stat; | |
292 | int rc; | |
293 | ||
294 | rc = ecryptfs_get_lower_file(dentry, inode); | |
295 | if (rc) { | |
296 | printk(KERN_ERR "%s: Error attempting to initialize " | |
297 | "the lower file for the dentry with name " | |
9e78d14a DH |
298 | "[%pd]; rc = [%d]\n", __func__, |
299 | dentry, rc); | |
778aeb42 TH |
300 | return rc; |
301 | } | |
302 | ||
303 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
304 | /* TODO: lock for crypt_stat comparison */ | |
305 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
306 | ecryptfs_set_default_sizes(crypt_stat); | |
307 | ||
308 | rc = ecryptfs_read_and_validate_header_region(inode); | |
309 | ecryptfs_put_lower_file(inode); | |
310 | if (rc) { | |
311 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
312 | if (!rc) | |
313 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
314 | } | |
315 | ||
316 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
317 | return 0; | |
318 | } | |
319 | ||
237fead6 | 320 | /** |
5ccf9203 | 321 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 322 | */ |
b1168a92 AV |
323 | static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, |
324 | struct dentry *lower_dentry) | |
237fead6 | 325 | { |
762c6968 | 326 | struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent); |
e72b9dd6 | 327 | struct inode *inode, *lower_inode; |
778aeb42 | 328 | struct ecryptfs_dentry_info *dentry_info; |
778aeb42 TH |
329 | int rc = 0; |
330 | ||
778aeb42 | 331 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 332 | if (!dentry_info) { |
778aeb42 | 333 | dput(lower_dentry); |
b1168a92 | 334 | return ERR_PTR(-ENOMEM); |
237fead6 | 335 | } |
0b1d9011 | 336 | |
b1168a92 | 337 | fsstack_copy_attr_atime(d_inode(dentry->d_parent), |
762c6968 | 338 | d_inode(path->dentry)); |
84d08fa8 | 339 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
340 | |
341 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
762c6968 | 342 | dentry_info->lower_path.mnt = mntget(path->mnt); |
92dd1230 | 343 | dentry_info->lower_path.dentry = lower_dentry; |
778aeb42 | 344 | |
e72b9dd6 AV |
345 | /* |
346 | * negative dentry can go positive under us here - its parent is not | |
347 | * locked. That's OK and that could happen just as we return from | |
348 | * ecryptfs_lookup() anyway. Just need to be careful and fetch | |
349 | * ->d_inode only once - it's not stable here. | |
350 | */ | |
351 | lower_inode = READ_ONCE(lower_dentry->d_inode); | |
352 | ||
353 | if (!lower_inode) { | |
237fead6 | 354 | /* We want to add because we couldn't find in lower */ |
778aeb42 | 355 | d_add(dentry, NULL); |
b1168a92 | 356 | return NULL; |
237fead6 | 357 | } |
b1168a92 | 358 | inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); |
5ccf9203 | 359 | if (IS_ERR(inode)) { |
778aeb42 TH |
360 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
361 | __func__, PTR_ERR(inode)); | |
b1168a92 | 362 | return ERR_CAST(inode); |
391b52f9 | 363 | } |
778aeb42 TH |
364 | if (S_ISREG(inode->i_mode)) { |
365 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 366 | if (rc) { |
778aeb42 | 367 | make_bad_inode(inode); |
b1168a92 | 368 | return ERR_PTR(rc); |
237fead6 | 369 | } |
237fead6 | 370 | } |
778aeb42 | 371 | |
3b06b3eb TH |
372 | if (inode->i_state & I_NEW) |
373 | unlock_new_inode(inode); | |
b1168a92 | 374 | return d_splice_alias(inode, dentry); |
addd65ad MH |
375 | } |
376 | ||
377 | /** | |
378 | * ecryptfs_lookup | |
379 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
380 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 381 | * @flags: lookup flags |
addd65ad MH |
382 | * |
383 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
384 | * dentry cache and continue on to read it from the disk. | |
385 | */ | |
386 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
387 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 388 | unsigned int flags) |
addd65ad MH |
389 | { |
390 | char *encrypted_and_encoded_name = NULL; | |
88ae4ab9 | 391 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
addd65ad | 392 | struct dentry *lower_dir_dentry, *lower_dentry; |
88ae4ab9 AV |
393 | const char *name = ecryptfs_dentry->d_name.name; |
394 | size_t len = ecryptfs_dentry->d_name.len; | |
b1168a92 | 395 | struct dentry *res; |
addd65ad MH |
396 | int rc = 0; |
397 | ||
addd65ad | 398 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
88ae4ab9 | 399 | |
2aac0cf8 TH |
400 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
401 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
ab13a921 | 402 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
88ae4ab9 AV |
403 | rc = ecryptfs_encrypt_and_encode_filename( |
404 | &encrypted_and_encoded_name, &len, | |
405 | mount_crypt_stat, name, len); | |
406 | if (rc) { | |
407 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
408 | "filename; rc = [%d]\n", __func__, rc); | |
409 | return ERR_PTR(rc); | |
410 | } | |
411 | name = encrypted_and_encoded_name; | |
addd65ad | 412 | } |
88ae4ab9 AV |
413 | |
414 | lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); | |
addd65ad | 415 | if (IS_ERR(lower_dentry)) { |
8787c7a3 | 416 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
b1168a92 AV |
417 | "[%ld] on lower_dentry = [%s]\n", __func__, |
418 | PTR_ERR(lower_dentry), | |
88ae4ab9 | 419 | name); |
b1168a92 | 420 | res = ERR_CAST(lower_dentry); |
88ae4ab9 AV |
421 | } else { |
422 | res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); | |
addd65ad | 423 | } |
addd65ad | 424 | kfree(encrypted_and_encoded_name); |
b1168a92 | 425 | return res; |
237fead6 MH |
426 | } |
427 | ||
428 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
429 | struct dentry *new_dentry) | |
430 | { | |
431 | struct dentry *lower_old_dentry; | |
432 | struct dentry *lower_new_dentry; | |
433 | struct dentry *lower_dir_dentry; | |
434 | u64 file_size_save; | |
435 | int rc; | |
436 | ||
2b0143b5 | 437 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 MH |
438 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
439 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
440 | dget(lower_old_dentry); | |
441 | dget(lower_new_dentry); | |
442 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
6521f891 CB |
443 | rc = vfs_link(lower_old_dentry, &init_user_ns, |
444 | d_inode(lower_dir_dentry), lower_new_dentry, NULL); | |
2b0143b5 | 445 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 446 | goto out_lock; |
5ccf9203 | 447 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
448 | if (rc) |
449 | goto out_lock; | |
2b0143b5 DH |
450 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
451 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
452 | set_nlink(d_inode(old_dentry), | |
453 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
454 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 MH |
455 | out_lock: |
456 | unlock_dir(lower_dir_dentry); | |
457 | dput(lower_new_dentry); | |
458 | dput(lower_old_dentry); | |
237fead6 MH |
459 | return rc; |
460 | } | |
461 | ||
462 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
463 | { | |
2b0143b5 | 464 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
465 | } |
466 | ||
549c7297 CB |
467 | static int ecryptfs_symlink(struct user_namespace *mnt_userns, |
468 | struct inode *dir, struct dentry *dentry, | |
237fead6 MH |
469 | const char *symname) |
470 | { | |
471 | int rc; | |
472 | struct dentry *lower_dentry; | |
473 | struct dentry *lower_dir_dentry; | |
237fead6 | 474 | char *encoded_symname; |
addd65ad MH |
475 | size_t encoded_symlen; |
476 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
477 | |
478 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
479 | dget(lower_dentry); | |
480 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
481 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
482 | dir->i_sb)->mount_crypt_stat; | |
483 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
484 | &encoded_symlen, | |
addd65ad MH |
485 | mount_crypt_stat, symname, |
486 | strlen(symname)); | |
487 | if (rc) | |
237fead6 | 488 | goto out_lock; |
6521f891 | 489 | rc = vfs_symlink(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, |
db2e747b | 490 | encoded_symname); |
237fead6 | 491 | kfree(encoded_symname); |
2b0143b5 | 492 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 493 | goto out_lock; |
5ccf9203 | 494 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
495 | if (rc) |
496 | goto out_lock; | |
2b0143b5 DH |
497 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
498 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
499 | out_lock: |
500 | unlock_dir(lower_dir_dentry); | |
501 | dput(lower_dentry); | |
2b0143b5 | 502 | if (d_really_is_negative(dentry)) |
237fead6 MH |
503 | d_drop(dentry); |
504 | return rc; | |
505 | } | |
506 | ||
549c7297 CB |
507 | static int ecryptfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
508 | struct dentry *dentry, umode_t mode) | |
237fead6 MH |
509 | { |
510 | int rc; | |
511 | struct dentry *lower_dentry; | |
512 | struct dentry *lower_dir_dentry; | |
513 | ||
514 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
515 | lower_dir_dentry = lock_parent(lower_dentry); | |
6521f891 CB |
516 | rc = vfs_mkdir(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, |
517 | mode); | |
2b0143b5 | 518 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 519 | goto out; |
5ccf9203 | 520 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
521 | if (rc) |
522 | goto out; | |
2b0143b5 DH |
523 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
524 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
525 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
526 | out: |
527 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 528 | if (d_really_is_negative(dentry)) |
237fead6 MH |
529 | d_drop(dentry); |
530 | return rc; | |
531 | } | |
532 | ||
533 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
534 | { | |
237fead6 | 535 | struct dentry *lower_dentry; |
237fead6 | 536 | struct dentry *lower_dir_dentry; |
bcf0d9d4 | 537 | struct inode *lower_dir_inode; |
45ec4aba | 538 | int rc; |
237fead6 MH |
539 | |
540 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
bcf0d9d4 AV |
541 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); |
542 | lower_dir_inode = d_inode(lower_dir_dentry); | |
543 | ||
544 | inode_lock_nested(lower_dir_inode, I_MUTEX_PARENT); | |
545 | dget(lower_dentry); // don't even try to make the lower negative | |
546 | if (lower_dentry->d_parent != lower_dir_dentry) | |
547 | rc = -EINVAL; | |
548 | else if (d_unhashed(lower_dentry)) | |
549 | rc = -EINVAL; | |
550 | else | |
6521f891 | 551 | rc = vfs_rmdir(&init_user_ns, lower_dir_inode, lower_dentry); |
bcf0d9d4 | 552 | if (!rc) { |
2b0143b5 | 553 | clear_nlink(d_inode(dentry)); |
bcf0d9d4 AV |
554 | fsstack_copy_attr_times(dir, lower_dir_inode); |
555 | set_nlink(dir, lower_dir_inode->i_nlink); | |
556 | } | |
557 | dput(lower_dentry); | |
558 | inode_unlock(lower_dir_inode); | |
237fead6 MH |
559 | if (!rc) |
560 | d_drop(dentry); | |
237fead6 MH |
561 | return rc; |
562 | } | |
563 | ||
564 | static int | |
549c7297 CB |
565 | ecryptfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
566 | struct dentry *dentry, umode_t mode, dev_t dev) | |
237fead6 MH |
567 | { |
568 | int rc; | |
569 | struct dentry *lower_dentry; | |
570 | struct dentry *lower_dir_dentry; | |
571 | ||
572 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
573 | lower_dir_dentry = lock_parent(lower_dentry); | |
6521f891 CB |
574 | rc = vfs_mknod(&init_user_ns, d_inode(lower_dir_dentry), lower_dentry, |
575 | mode, dev); | |
2b0143b5 | 576 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 577 | goto out; |
5ccf9203 | 578 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
579 | if (rc) |
580 | goto out; | |
2b0143b5 DH |
581 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
582 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
583 | out: |
584 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 585 | if (d_really_is_negative(dentry)) |
237fead6 MH |
586 | d_drop(dentry); |
587 | return rc; | |
588 | } | |
589 | ||
590 | static int | |
549c7297 CB |
591 | ecryptfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
592 | struct dentry *old_dentry, struct inode *new_dir, | |
593 | struct dentry *new_dentry, unsigned int flags) | |
237fead6 MH |
594 | { |
595 | int rc; | |
596 | struct dentry *lower_old_dentry; | |
597 | struct dentry *lower_new_dentry; | |
598 | struct dentry *lower_old_dir_dentry; | |
599 | struct dentry *lower_new_dir_dentry; | |
bcf0d9d4 | 600 | struct dentry *trap; |
8335eafc | 601 | struct inode *target_inode; |
9fe61450 | 602 | struct renamedata rd = {}; |
237fead6 | 603 | |
1cd66c93 MS |
604 | if (flags) |
605 | return -EINVAL; | |
606 | ||
bcf0d9d4 AV |
607 | lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); |
608 | lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); | |
609 | ||
237fead6 MH |
610 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
611 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
bcf0d9d4 | 612 | |
2b0143b5 | 613 | target_inode = d_inode(new_dentry); |
bcf0d9d4 | 614 | |
0d132f73 | 615 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
bcf0d9d4 | 616 | dget(lower_new_dentry); |
74dd7c97 AV |
617 | rc = -EINVAL; |
618 | if (lower_old_dentry->d_parent != lower_old_dir_dentry) | |
619 | goto out_lock; | |
620 | if (lower_new_dentry->d_parent != lower_new_dir_dentry) | |
621 | goto out_lock; | |
622 | if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) | |
623 | goto out_lock; | |
0d132f73 | 624 | /* source should not be ancestor of target */ |
74dd7c97 | 625 | if (trap == lower_old_dentry) |
0d132f73 | 626 | goto out_lock; |
0d132f73 EZ |
627 | /* target should not be ancestor of source */ |
628 | if (trap == lower_new_dentry) { | |
629 | rc = -ENOTEMPTY; | |
630 | goto out_lock; | |
631 | } | |
9fe61450 | 632 | |
6521f891 CB |
633 | rd.old_mnt_userns = &init_user_ns; |
634 | rd.old_dir = d_inode(lower_old_dir_dentry); | |
635 | rd.old_dentry = lower_old_dentry; | |
636 | rd.new_mnt_userns = &init_user_ns; | |
637 | rd.new_dir = d_inode(lower_new_dir_dentry); | |
638 | rd.new_dentry = lower_new_dentry; | |
9fe61450 | 639 | rc = vfs_rename(&rd); |
237fead6 MH |
640 | if (rc) |
641 | goto out_lock; | |
8335eafc TH |
642 | if (target_inode) |
643 | fsstack_copy_attr_all(target_inode, | |
644 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 645 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 646 | if (new_dir != old_dir) |
2b0143b5 | 647 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 | 648 | out_lock: |
237fead6 | 649 | dput(lower_new_dentry); |
bcf0d9d4 | 650 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
237fead6 MH |
651 | return rc; |
652 | } | |
653 | ||
b22e8fed | 654 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 655 | { |
6c988f57 | 656 | DEFINE_DELAYED_CALL(done); |
3a60a168 | 657 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
6c988f57 | 658 | const char *link; |
b22e8fed | 659 | char *buf; |
addd65ad | 660 | int rc; |
237fead6 | 661 | |
6c988f57 MS |
662 | link = vfs_get_link(lower_dentry, &done); |
663 | if (IS_ERR(link)) | |
664 | return ERR_CAST(link); | |
665 | ||
b22e8fed | 666 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
6c988f57 MS |
667 | link, strlen(link)); |
668 | do_delayed_call(&done); | |
669 | if (rc) | |
670 | return ERR_PTR(rc); | |
671 | ||
672 | return buf; | |
3a60a168 TH |
673 | } |
674 | ||
6b255391 | 675 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
676 | struct inode *inode, |
677 | struct delayed_call *done) | |
3a60a168 | 678 | { |
b22e8fed | 679 | size_t len; |
6b255391 AV |
680 | char *buf; |
681 | ||
682 | if (!dentry) | |
683 | return ERR_PTR(-ECHILD); | |
684 | ||
685 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 686 | if (IS_ERR(buf)) |
680baacb | 687 | return buf; |
2b0143b5 DH |
688 | fsstack_copy_attr_atime(d_inode(dentry), |
689 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 690 | buf[len] = '\0'; |
fceef393 AV |
691 | set_delayed_call(done, kfree_link, buf); |
692 | return buf; | |
237fead6 MH |
693 | } |
694 | ||
237fead6 MH |
695 | /** |
696 | * upper_size_to_lower_size | |
697 | * @crypt_stat: Crypt_stat associated with file | |
698 | * @upper_size: Size of the upper file | |
699 | * | |
cc11beff | 700 | * Calculate the required size of the lower file based on the |
237fead6 MH |
701 | * specified size of the upper file. This calculation is based on the |
702 | * number of headers in the underlying file and the extent size. | |
703 | * | |
704 | * Returns Calculated size of the lower file. | |
705 | */ | |
706 | static loff_t | |
707 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
708 | loff_t upper_size) | |
709 | { | |
710 | loff_t lower_size; | |
711 | ||
157f1071 | 712 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
713 | if (upper_size != 0) { |
714 | loff_t num_extents; | |
715 | ||
716 | num_extents = upper_size >> crypt_stat->extent_shift; | |
717 | if (upper_size & ~crypt_stat->extent_mask) | |
718 | num_extents++; | |
719 | lower_size += (num_extents * crypt_stat->extent_size); | |
720 | } | |
721 | return lower_size; | |
722 | } | |
723 | ||
724 | /** | |
5f3ef64f | 725 | * truncate_upper |
237fead6 | 726 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
727 | * @ia: Address of the ecryptfs inode's attributes |
728 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
729 | * |
730 | * Function to handle truncations modifying the size of the file. Note | |
731 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
732 | * writing strings of 0's out. When truncating, we truncate the upper |
733 | * inode and update the lower_ia according to the page index | |
734 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
735 | * the caller must use lower_ia in a call to notify_change() to perform | |
736 | * the truncation of the lower inode. | |
237fead6 MH |
737 | * |
738 | * Returns zero on success; non-zero otherwise | |
739 | */ | |
5f3ef64f TH |
740 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
741 | struct iattr *lower_ia) | |
237fead6 MH |
742 | { |
743 | int rc = 0; | |
2b0143b5 | 744 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
745 | struct ecryptfs_crypt_stat *crypt_stat; |
746 | loff_t i_size = i_size_read(inode); | |
747 | loff_t lower_size_before_truncate; | |
748 | loff_t lower_size_after_truncate; | |
749 | ||
5f3ef64f TH |
750 | if (unlikely((ia->ia_size == i_size))) { |
751 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 752 | return 0; |
5f3ef64f | 753 | } |
3b06b3eb | 754 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
755 | if (rc) |
756 | return rc; | |
2b0143b5 | 757 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 758 | /* Switch on growing or shrinking file */ |
5f3ef64f | 759 | if (ia->ia_size > i_size) { |
2ed92554 MH |
760 | char zero[] = { 0x00 }; |
761 | ||
5f3ef64f | 762 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
763 | /* Write a single 0 at the last position of the file; |
764 | * this triggers code that will fill in 0's throughout | |
765 | * the intermediate portion of the previous end of the | |
766 | * file and the new and of the file */ | |
48c1e44a | 767 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
768 | (ia->ia_size - 1), 1); |
769 | } else { /* ia->ia_size < i_size_read(inode) */ | |
770 | /* We're chopping off all the pages down to the page | |
771 | * in which ia->ia_size is located. Fill in the end of | |
ea1754a0 KS |
772 | * that page from (ia->ia_size & ~PAGE_MASK) to |
773 | * PAGE_SIZE with zeros. */ | |
09cbfeaf KS |
774 | size_t num_zeros = (PAGE_SIZE |
775 | - (ia->ia_size & ~PAGE_MASK)); | |
2ed92554 | 776 | |
13a791b4 | 777 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 778 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
779 | lower_ia->ia_size = ia->ia_size; |
780 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 781 | goto out; |
13a791b4 | 782 | } |
2ed92554 MH |
783 | if (num_zeros) { |
784 | char *zeros_virt; | |
785 | ||
786 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
787 | if (!zeros_virt) { | |
788 | rc = -ENOMEM; | |
48c1e44a | 789 | goto out; |
2ed92554 | 790 | } |
48c1e44a | 791 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 792 | ia->ia_size, num_zeros); |
2ed92554 | 793 | kfree(zeros_virt); |
5dda6992 | 794 | if (rc) { |
240e2df5 MH |
795 | printk(KERN_ERR "Error attempting to zero out " |
796 | "the remainder of the end page on " | |
797 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 798 | goto out; |
240e2df5 MH |
799 | } |
800 | } | |
2c27c65e | 801 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 802 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
803 | if (rc) { |
804 | printk(KERN_ERR "Problem with " | |
805 | "ecryptfs_write_inode_size_to_metadata; " | |
806 | "rc = [%d]\n", rc); | |
48c1e44a | 807 | goto out; |
dd2a3b7a | 808 | } |
237fead6 MH |
809 | /* We are reducing the size of the ecryptfs file, and need to |
810 | * know if we need to reduce the size of the lower file. */ | |
811 | lower_size_before_truncate = | |
812 | upper_size_to_lower_size(crypt_stat, i_size); | |
813 | lower_size_after_truncate = | |
5f3ef64f TH |
814 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
815 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
816 | lower_ia->ia_size = lower_size_after_truncate; | |
817 | lower_ia->ia_valid |= ATTR_SIZE; | |
818 | } else | |
819 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 820 | } |
237fead6 | 821 | out: |
332ab16f | 822 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
823 | return rc; |
824 | } | |
825 | ||
a261a039 TH |
826 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
827 | { | |
828 | struct ecryptfs_crypt_stat *crypt_stat; | |
829 | loff_t lower_oldsize, lower_newsize; | |
830 | ||
831 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
832 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
833 | i_size_read(inode)); | |
834 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
835 | if (lower_newsize > lower_oldsize) { | |
836 | /* | |
837 | * The eCryptfs inode and the new *lower* size are mixed here | |
838 | * because we may not have the lower i_mutex held and/or it may | |
839 | * not be appropriate to call inode_newsize_ok() with inodes | |
840 | * from other filesystems. | |
841 | */ | |
842 | return inode_newsize_ok(inode, lower_newsize); | |
843 | } | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
5f3ef64f TH |
848 | /** |
849 | * ecryptfs_truncate | |
850 | * @dentry: The ecryptfs layer dentry | |
851 | * @new_length: The length to expand the file to | |
852 | * | |
853 | * Simple function that handles the truncation of an eCryptfs inode and | |
854 | * its corresponding lower inode. | |
855 | * | |
856 | * Returns zero on success; non-zero otherwise | |
857 | */ | |
858 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
859 | { | |
860 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
861 | struct iattr lower_ia = { .ia_valid = 0 }; | |
862 | int rc; | |
863 | ||
2b0143b5 | 864 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
865 | if (rc) |
866 | return rc; | |
867 | ||
5f3ef64f TH |
868 | rc = truncate_upper(dentry, &ia, &lower_ia); |
869 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
870 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
871 | ||
5955102c | 872 | inode_lock(d_inode(lower_dentry)); |
2f221d6f CB |
873 | rc = notify_change(&init_user_ns, lower_dentry, |
874 | &lower_ia, NULL); | |
5955102c | 875 | inode_unlock(d_inode(lower_dentry)); |
5f3ef64f TH |
876 | } |
877 | return rc; | |
878 | } | |
879 | ||
237fead6 | 880 | static int |
549c7297 CB |
881 | ecryptfs_permission(struct user_namespace *mnt_userns, struct inode *inode, |
882 | int mask) | |
237fead6 | 883 | { |
47291baa CB |
884 | return inode_permission(&init_user_ns, |
885 | ecryptfs_inode_to_lower(inode), mask); | |
237fead6 MH |
886 | } |
887 | ||
888 | /** | |
889 | * ecryptfs_setattr | |
890 | * @dentry: dentry handle to the inode to modify | |
891 | * @ia: Structure with flags of what to change and values | |
892 | * | |
893 | * Updates the metadata of an inode. If the update is to the size | |
894 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
895 | * of both the ecryptfs inode and the lower inode. | |
896 | * | |
897 | * All other metadata changes will be passed right to the lower filesystem, | |
898 | * and we will just update our inode to look like the lower. | |
899 | */ | |
549c7297 CB |
900 | static int ecryptfs_setattr(struct user_namespace *mnt_userns, |
901 | struct dentry *dentry, struct iattr *ia) | |
237fead6 MH |
902 | { |
903 | int rc = 0; | |
904 | struct dentry *lower_dentry; | |
5f3ef64f | 905 | struct iattr lower_ia; |
237fead6 MH |
906 | struct inode *inode; |
907 | struct inode *lower_inode; | |
908 | struct ecryptfs_crypt_stat *crypt_stat; | |
909 | ||
2b0143b5 | 910 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e81f3340 HX |
911 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { |
912 | rc = ecryptfs_init_crypt_stat(crypt_stat); | |
913 | if (rc) | |
914 | return rc; | |
915 | } | |
2b0143b5 | 916 | inode = d_inode(dentry); |
237fead6 | 917 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
918 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
919 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 920 | if (d_is_dir(dentry)) |
e10f281b | 921 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 922 | else if (d_is_reg(dentry) |
64ee4808 MH |
923 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
924 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 925 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 926 | |
e10f281b MH |
927 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
928 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 929 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
930 | if (rc) { |
931 | mutex_unlock(&crypt_stat->cs_mutex); | |
932 | goto out; | |
933 | } | |
d7cdc5fe | 934 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 935 | ecryptfs_put_lower_file(inode); |
5dda6992 | 936 | if (rc) { |
e10f281b MH |
937 | if (!(mount_crypt_stat->flags |
938 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
939 | rc = -EIO; | |
25bd8174 | 940 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 941 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
942 | "or the key could not be retrieved. " |
943 | "Plaintext passthrough mode is not " | |
e10f281b | 944 | "enabled; returning -EIO\n"); |
e10f281b | 945 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
946 | goto out; |
947 | } | |
948 | rc = 0; | |
3aeb86ea TH |
949 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
950 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 951 | } |
e10f281b MH |
952 | } |
953 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 | 954 | |
2f221d6f | 955 | rc = setattr_prepare(&init_user_ns, dentry, ia); |
a261a039 TH |
956 | if (rc) |
957 | goto out; | |
958 | if (ia->ia_valid & ATTR_SIZE) { | |
959 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
960 | if (rc) | |
961 | goto out; | |
962 | } | |
963 | ||
5f3ef64f TH |
964 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
965 | if (ia->ia_valid & ATTR_FILE) | |
966 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 967 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 968 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
969 | if (rc < 0) |
970 | goto out; | |
971 | } | |
1ac564ec JL |
972 | |
973 | /* | |
974 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
975 | * to interpret this in its own way. | |
976 | */ | |
5f3ef64f TH |
977 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
978 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 979 | |
5955102c | 980 | inode_lock(d_inode(lower_dentry)); |
2f221d6f | 981 | rc = notify_change(&init_user_ns, lower_dentry, &lower_ia, NULL); |
5955102c | 982 | inode_unlock(d_inode(lower_dentry)); |
237fead6 | 983 | out: |
9afa2fb6 | 984 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
985 | return rc; |
986 | } | |
987 | ||
549c7297 CB |
988 | static int ecryptfs_getattr_link(struct user_namespace *mnt_userns, |
989 | const struct path *path, struct kstat *stat, | |
a528d35e | 990 | u32 request_mask, unsigned int flags) |
3a60a168 | 991 | { |
a528d35e | 992 | struct dentry *dentry = path->dentry; |
3a60a168 TH |
993 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
994 | int rc = 0; | |
995 | ||
996 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
997 | dentry->d_sb)->mount_crypt_stat; | |
0d56a451 | 998 | generic_fillattr(&init_user_ns, d_inode(dentry), stat); |
3a60a168 TH |
999 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
1000 | char *target; | |
1001 | size_t targetsiz; | |
1002 | ||
b22e8fed AV |
1003 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
1004 | if (!IS_ERR(target)) { | |
3a60a168 TH |
1005 | kfree(target); |
1006 | stat->size = targetsiz; | |
b22e8fed AV |
1007 | } else { |
1008 | rc = PTR_ERR(target); | |
3a60a168 TH |
1009 | } |
1010 | } | |
1011 | return rc; | |
1012 | } | |
1013 | ||
549c7297 CB |
1014 | static int ecryptfs_getattr(struct user_namespace *mnt_userns, |
1015 | const struct path *path, struct kstat *stat, | |
a528d35e | 1016 | u32 request_mask, unsigned int flags) |
f8f484d1 | 1017 | { |
a528d35e | 1018 | struct dentry *dentry = path->dentry; |
f8f484d1 TH |
1019 | struct kstat lower_stat; |
1020 | int rc; | |
1021 | ||
a528d35e DH |
1022 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, |
1023 | request_mask, flags); | |
f8f484d1 | 1024 | if (!rc) { |
2b0143b5 DH |
1025 | fsstack_copy_attr_all(d_inode(dentry), |
1026 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
0d56a451 | 1027 | generic_fillattr(&init_user_ns, d_inode(dentry), stat); |
f8f484d1 TH |
1028 | stat->blocks = lower_stat.blocks; |
1029 | } | |
1030 | return rc; | |
1031 | } | |
1032 | ||
dd2a3b7a | 1033 | int |
3767e255 AV |
1034 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, |
1035 | const char *name, const void *value, | |
237fead6 MH |
1036 | size_t size, int flags) |
1037 | { | |
5d6c3191 | 1038 | int rc; |
237fead6 MH |
1039 | struct dentry *lower_dentry; |
1040 | ||
1041 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
5d6c3191 | 1042 | if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1043 | rc = -EOPNOTSUPP; |
237fead6 MH |
1044 | goto out; |
1045 | } | |
c7c7a1a1 TA |
1046 | rc = vfs_setxattr(&init_user_ns, lower_dentry, name, value, size, |
1047 | flags); | |
3767e255 AV |
1048 | if (!rc && inode) |
1049 | fsstack_copy_attr_all(inode, d_inode(lower_dentry)); | |
237fead6 MH |
1050 | out: |
1051 | return rc; | |
1052 | } | |
1053 | ||
d7cdc5fe | 1054 | ssize_t |
ce23e640 AV |
1055 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
1056 | const char *name, void *value, size_t size) | |
d7cdc5fe | 1057 | { |
5d6c3191 | 1058 | int rc; |
d7cdc5fe | 1059 | |
5d6c3191 | 1060 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1061 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1062 | goto out; |
1063 | } | |
ce23e640 | 1064 | inode_lock(lower_inode); |
5d6c3191 | 1065 | rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); |
ce23e640 | 1066 | inode_unlock(lower_inode); |
d7cdc5fe MH |
1067 | out: |
1068 | return rc; | |
1069 | } | |
1070 | ||
7896b631 | 1071 | static ssize_t |
ce23e640 AV |
1072 | ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, |
1073 | const char *name, void *value, size_t size) | |
237fead6 | 1074 | { |
ce23e640 AV |
1075 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), |
1076 | ecryptfs_inode_to_lower(inode), | |
1077 | name, value, size); | |
237fead6 MH |
1078 | } |
1079 | ||
1080 | static ssize_t | |
1081 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1082 | { | |
1083 | int rc = 0; | |
1084 | struct dentry *lower_dentry; | |
1085 | ||
1086 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1087 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1088 | rc = -EOPNOTSUPP; |
237fead6 MH |
1089 | goto out; |
1090 | } | |
5955102c | 1091 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1092 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
5955102c | 1093 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1094 | out: |
1095 | return rc; | |
1096 | } | |
1097 | ||
4b899da5 AG |
1098 | static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, |
1099 | const char *name) | |
237fead6 | 1100 | { |
5d6c3191 | 1101 | int rc; |
237fead6 | 1102 | struct dentry *lower_dentry; |
4b899da5 | 1103 | struct inode *lower_inode; |
237fead6 MH |
1104 | |
1105 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
4b899da5 | 1106 | lower_inode = ecryptfs_inode_to_lower(inode); |
5d6c3191 | 1107 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1108 | rc = -EOPNOTSUPP; |
237fead6 MH |
1109 | goto out; |
1110 | } | |
4b899da5 | 1111 | inode_lock(lower_inode); |
c7c7a1a1 | 1112 | rc = __vfs_removexattr(&init_user_ns, lower_dentry, name); |
4b899da5 | 1113 | inode_unlock(lower_inode); |
237fead6 MH |
1114 | out: |
1115 | return rc; | |
1116 | } | |
1117 | ||
754661f1 | 1118 | const struct inode_operations ecryptfs_symlink_iops = { |
6b255391 | 1119 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1120 | .permission = ecryptfs_permission, |
1121 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1122 | .getattr = ecryptfs_getattr_link, |
237fead6 | 1123 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1124 | }; |
1125 | ||
754661f1 | 1126 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1127 | .create = ecryptfs_create, |
1128 | .lookup = ecryptfs_lookup, | |
1129 | .link = ecryptfs_link, | |
1130 | .unlink = ecryptfs_unlink, | |
1131 | .symlink = ecryptfs_symlink, | |
1132 | .mkdir = ecryptfs_mkdir, | |
1133 | .rmdir = ecryptfs_rmdir, | |
1134 | .mknod = ecryptfs_mknod, | |
1135 | .rename = ecryptfs_rename, | |
1136 | .permission = ecryptfs_permission, | |
1137 | .setattr = ecryptfs_setattr, | |
237fead6 | 1138 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1139 | }; |
1140 | ||
754661f1 | 1141 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1142 | .permission = ecryptfs_permission, |
1143 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1144 | .getattr = ecryptfs_getattr, |
237fead6 | 1145 | .listxattr = ecryptfs_listxattr, |
4b899da5 AG |
1146 | }; |
1147 | ||
1148 | static int ecryptfs_xattr_get(const struct xattr_handler *handler, | |
1149 | struct dentry *dentry, struct inode *inode, | |
1150 | const char *name, void *buffer, size_t size) | |
1151 | { | |
1152 | return ecryptfs_getxattr(dentry, inode, name, buffer, size); | |
1153 | } | |
1154 | ||
1155 | static int ecryptfs_xattr_set(const struct xattr_handler *handler, | |
e65ce2a5 | 1156 | struct user_namespace *mnt_userns, |
4b899da5 AG |
1157 | struct dentry *dentry, struct inode *inode, |
1158 | const char *name, const void *value, size_t size, | |
1159 | int flags) | |
1160 | { | |
1161 | if (value) | |
1162 | return ecryptfs_setxattr(dentry, inode, name, value, size, flags); | |
1163 | else { | |
1164 | BUG_ON(flags != XATTR_REPLACE); | |
1165 | return ecryptfs_removexattr(dentry, inode, name); | |
1166 | } | |
1167 | } | |
1168 | ||
c036061b | 1169 | static const struct xattr_handler ecryptfs_xattr_handler = { |
4b899da5 AG |
1170 | .prefix = "", /* match anything */ |
1171 | .get = ecryptfs_xattr_get, | |
1172 | .set = ecryptfs_xattr_set, | |
1173 | }; | |
1174 | ||
1175 | const struct xattr_handler *ecryptfs_xattr_handlers[] = { | |
1176 | &ecryptfs_xattr_handler, | |
1177 | NULL | |
237fead6 | 1178 | }; |