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); | |
131 | struct inode *lower_dir_inode = ecryptfs_inode_to_lower(dir); | |
132 | struct dentry *lower_dir_dentry; | |
133 | int rc; | |
134 | ||
135 | dget(lower_dentry); | |
136 | lower_dir_dentry = lock_parent(lower_dentry); | |
b21996e3 | 137 | rc = vfs_unlink(lower_dir_inode, lower_dentry, NULL); |
8bc2d3cf TH |
138 | if (rc) { |
139 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
140 | goto out_unlock; | |
141 | } | |
142 | fsstack_copy_attr_times(dir, lower_dir_inode); | |
143 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); | |
144 | inode->i_ctime = dir->i_ctime; | |
145 | d_drop(dentry); | |
146 | out_unlock: | |
147 | unlock_dir(lower_dir_dentry); | |
148 | dput(lower_dentry); | |
149 | return rc; | |
150 | } | |
151 | ||
237fead6 MH |
152 | /** |
153 | * ecryptfs_do_create | |
154 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
155 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
156 | * @mode: The mode of the new file | |
237fead6 MH |
157 | * |
158 | * Creates the underlying file and the eCryptfs inode which will link to | |
159 | * it. It will also update the eCryptfs directory inode to mimic the | |
160 | * stat of the lower directory inode. | |
161 | * | |
b59db43a | 162 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 163 | */ |
b59db43a | 164 | static struct inode * |
237fead6 | 165 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 166 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
167 | { |
168 | int rc; | |
169 | struct dentry *lower_dentry; | |
170 | struct dentry *lower_dir_dentry; | |
b59db43a | 171 | struct inode *inode; |
237fead6 MH |
172 | |
173 | lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry); | |
174 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 | 175 | rc = vfs_create(d_inode(lower_dir_dentry), lower_dentry, mode, true); |
4981e081 | 176 | if (rc) { |
caeeeecf | 177 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 178 | "rc = [%d]\n", __func__, rc); |
b59db43a | 179 | inode = ERR_PTR(rc); |
caeeeecf | 180 | goto out_lock; |
237fead6 | 181 | } |
2b0143b5 | 182 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
b59db43a | 183 | directory_inode->i_sb); |
8bc2d3cf | 184 | if (IS_ERR(inode)) { |
2b0143b5 | 185 | vfs_unlink(d_inode(lower_dir_dentry), lower_dentry, NULL); |
237fead6 | 186 | goto out_lock; |
8bc2d3cf | 187 | } |
2b0143b5 DH |
188 | fsstack_copy_attr_times(directory_inode, d_inode(lower_dir_dentry)); |
189 | fsstack_copy_inode_size(directory_inode, d_inode(lower_dir_dentry)); | |
237fead6 MH |
190 | out_lock: |
191 | unlock_dir(lower_dir_dentry); | |
b59db43a | 192 | return inode; |
237fead6 MH |
193 | } |
194 | ||
237fead6 MH |
195 | /** |
196 | * ecryptfs_initialize_file | |
197 | * | |
198 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
199 | * file with a header and first data page. | |
200 | * | |
201 | * Returns zero on success | |
202 | */ | |
e3ccaa97 TH |
203 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
204 | struct inode *ecryptfs_inode) | |
237fead6 | 205 | { |
d7cdc5fe | 206 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 207 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 208 | int rc = 0; |
237fead6 | 209 | |
b59db43a | 210 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 211 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 212 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 213 | goto out; |
237fead6 | 214 | } |
237fead6 | 215 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 216 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 217 | if (rc) { |
d7cdc5fe MH |
218 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
219 | "context; rc = [%d]\n", rc); | |
220 | goto out; | |
237fead6 | 221 | } |
b59db43a | 222 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
223 | if (rc) { |
224 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 225 | "the lower file for the dentry with name " |
9e78d14a DH |
226 | "[%pd]; rc = [%d]\n", __func__, |
227 | ecryptfs_dentry, rc); | |
27992890 | 228 | goto out; |
391b52f9 | 229 | } |
b59db43a | 230 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 231 | if (rc) |
d7cdc5fe | 232 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 233 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
234 | out: |
235 | return rc; | |
236 | } | |
237 | ||
238 | /** | |
239 | * ecryptfs_create | |
240 | * @dir: The inode of the directory in which to create the file. | |
241 | * @dentry: The eCryptfs dentry | |
242 | * @mode: The mode of the new file. | |
237fead6 MH |
243 | * |
244 | * Creates a new file. | |
245 | * | |
246 | * Returns zero on success; non-zero on error condition | |
247 | */ | |
248 | static int | |
249 | ecryptfs_create(struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 250 | umode_t mode, bool excl) |
237fead6 | 251 | { |
b59db43a | 252 | struct inode *ecryptfs_inode; |
237fead6 MH |
253 | int rc; |
254 | ||
b59db43a TH |
255 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
256 | mode); | |
a1c83681 | 257 | if (IS_ERR(ecryptfs_inode)) { |
237fead6 MH |
258 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
259 | "lower filesystem\n"); | |
b59db43a | 260 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
261 | goto out; |
262 | } | |
263 | /* At this point, a file exists on "disk"; we need to make sure | |
264 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
265 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
266 | if (rc) { | |
8bc2d3cf TH |
267 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
268 | ecryptfs_inode); | |
0e81ba23 | 269 | iget_failed(ecryptfs_inode); |
b59db43a TH |
270 | goto out; |
271 | } | |
1e2e547a | 272 | d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
273 | out: |
274 | return rc; | |
275 | } | |
276 | ||
778aeb42 TH |
277 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
278 | { | |
279 | struct ecryptfs_crypt_stat *crypt_stat; | |
280 | int rc; | |
281 | ||
282 | rc = ecryptfs_get_lower_file(dentry, inode); | |
283 | if (rc) { | |
284 | printk(KERN_ERR "%s: Error attempting to initialize " | |
285 | "the lower file for the dentry with name " | |
9e78d14a DH |
286 | "[%pd]; rc = [%d]\n", __func__, |
287 | dentry, rc); | |
778aeb42 TH |
288 | return rc; |
289 | } | |
290 | ||
291 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
292 | /* TODO: lock for crypt_stat comparison */ | |
293 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
294 | ecryptfs_set_default_sizes(crypt_stat); | |
295 | ||
296 | rc = ecryptfs_read_and_validate_header_region(inode); | |
297 | ecryptfs_put_lower_file(inode); | |
298 | if (rc) { | |
299 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
300 | if (!rc) | |
301 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
302 | } | |
303 | ||
304 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
305 | return 0; | |
306 | } | |
307 | ||
237fead6 | 308 | /** |
5ccf9203 | 309 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 310 | */ |
b1168a92 AV |
311 | static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, |
312 | struct dentry *lower_dentry) | |
237fead6 | 313 | { |
2b0143b5 | 314 | struct inode *inode, *lower_inode = d_inode(lower_dentry); |
778aeb42 | 315 | struct ecryptfs_dentry_info *dentry_info; |
237fead6 | 316 | struct vfsmount *lower_mnt; |
778aeb42 TH |
317 | int rc = 0; |
318 | ||
778aeb42 | 319 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 320 | if (!dentry_info) { |
778aeb42 | 321 | dput(lower_dentry); |
b1168a92 | 322 | return ERR_PTR(-ENOMEM); |
237fead6 | 323 | } |
0b1d9011 AV |
324 | |
325 | lower_mnt = mntget(ecryptfs_dentry_to_lower_mnt(dentry->d_parent)); | |
b1168a92 AV |
326 | fsstack_copy_attr_atime(d_inode(dentry->d_parent), |
327 | d_inode(lower_dentry->d_parent)); | |
84d08fa8 | 328 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
329 | |
330 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
92dd1230 AV |
331 | dentry_info->lower_path.mnt = lower_mnt; |
332 | dentry_info->lower_path.dentry = lower_dentry; | |
778aeb42 | 333 | |
2b0143b5 | 334 | if (d_really_is_negative(lower_dentry)) { |
237fead6 | 335 | /* We want to add because we couldn't find in lower */ |
778aeb42 | 336 | d_add(dentry, NULL); |
b1168a92 | 337 | return NULL; |
237fead6 | 338 | } |
b1168a92 | 339 | inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); |
5ccf9203 | 340 | if (IS_ERR(inode)) { |
778aeb42 TH |
341 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
342 | __func__, PTR_ERR(inode)); | |
b1168a92 | 343 | return ERR_CAST(inode); |
391b52f9 | 344 | } |
778aeb42 TH |
345 | if (S_ISREG(inode->i_mode)) { |
346 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 347 | if (rc) { |
778aeb42 | 348 | make_bad_inode(inode); |
b1168a92 | 349 | return ERR_PTR(rc); |
237fead6 | 350 | } |
237fead6 | 351 | } |
778aeb42 | 352 | |
3b06b3eb TH |
353 | if (inode->i_state & I_NEW) |
354 | unlock_new_inode(inode); | |
b1168a92 | 355 | return d_splice_alias(inode, dentry); |
addd65ad MH |
356 | } |
357 | ||
358 | /** | |
359 | * ecryptfs_lookup | |
360 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
361 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 362 | * @flags: lookup flags |
addd65ad MH |
363 | * |
364 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
365 | * dentry cache and continue on to read it from the disk. | |
366 | */ | |
367 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
368 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 369 | unsigned int flags) |
addd65ad MH |
370 | { |
371 | char *encrypted_and_encoded_name = NULL; | |
88ae4ab9 | 372 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
addd65ad | 373 | struct dentry *lower_dir_dentry, *lower_dentry; |
88ae4ab9 AV |
374 | const char *name = ecryptfs_dentry->d_name.name; |
375 | size_t len = ecryptfs_dentry->d_name.len; | |
b1168a92 | 376 | struct dentry *res; |
addd65ad MH |
377 | int rc = 0; |
378 | ||
addd65ad | 379 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
88ae4ab9 | 380 | |
2aac0cf8 TH |
381 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
382 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
ab13a921 | 383 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
88ae4ab9 AV |
384 | rc = ecryptfs_encrypt_and_encode_filename( |
385 | &encrypted_and_encoded_name, &len, | |
386 | mount_crypt_stat, name, len); | |
387 | if (rc) { | |
388 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
389 | "filename; rc = [%d]\n", __func__, rc); | |
390 | return ERR_PTR(rc); | |
391 | } | |
392 | name = encrypted_and_encoded_name; | |
addd65ad | 393 | } |
88ae4ab9 AV |
394 | |
395 | lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); | |
addd65ad | 396 | if (IS_ERR(lower_dentry)) { |
8787c7a3 | 397 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
b1168a92 AV |
398 | "[%ld] on lower_dentry = [%s]\n", __func__, |
399 | PTR_ERR(lower_dentry), | |
88ae4ab9 | 400 | name); |
b1168a92 | 401 | res = ERR_CAST(lower_dentry); |
88ae4ab9 AV |
402 | } else { |
403 | res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); | |
addd65ad | 404 | } |
addd65ad | 405 | kfree(encrypted_and_encoded_name); |
b1168a92 | 406 | return res; |
237fead6 MH |
407 | } |
408 | ||
409 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
410 | struct dentry *new_dentry) | |
411 | { | |
412 | struct dentry *lower_old_dentry; | |
413 | struct dentry *lower_new_dentry; | |
414 | struct dentry *lower_dir_dentry; | |
415 | u64 file_size_save; | |
416 | int rc; | |
417 | ||
2b0143b5 | 418 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 MH |
419 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
420 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
421 | dget(lower_old_dentry); | |
422 | dget(lower_new_dentry); | |
423 | lower_dir_dentry = lock_parent(lower_new_dentry); | |
2b0143b5 | 424 | rc = vfs_link(lower_old_dentry, d_inode(lower_dir_dentry), |
146a8595 | 425 | lower_new_dentry, NULL); |
2b0143b5 | 426 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 427 | goto out_lock; |
5ccf9203 | 428 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
429 | if (rc) |
430 | goto out_lock; | |
2b0143b5 DH |
431 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
432 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
433 | set_nlink(d_inode(old_dentry), | |
434 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
435 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 MH |
436 | out_lock: |
437 | unlock_dir(lower_dir_dentry); | |
438 | dput(lower_new_dentry); | |
439 | dput(lower_old_dentry); | |
237fead6 MH |
440 | return rc; |
441 | } | |
442 | ||
443 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
444 | { | |
2b0143b5 | 445 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
446 | } |
447 | ||
448 | static int ecryptfs_symlink(struct inode *dir, struct dentry *dentry, | |
449 | const char *symname) | |
450 | { | |
451 | int rc; | |
452 | struct dentry *lower_dentry; | |
453 | struct dentry *lower_dir_dentry; | |
237fead6 | 454 | char *encoded_symname; |
addd65ad MH |
455 | size_t encoded_symlen; |
456 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 MH |
457 | |
458 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
459 | dget(lower_dentry); | |
460 | lower_dir_dentry = lock_parent(lower_dentry); | |
addd65ad MH |
461 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
462 | dir->i_sb)->mount_crypt_stat; | |
463 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
464 | &encoded_symlen, | |
addd65ad MH |
465 | mount_crypt_stat, symname, |
466 | strlen(symname)); | |
467 | if (rc) | |
237fead6 | 468 | goto out_lock; |
2b0143b5 | 469 | rc = vfs_symlink(d_inode(lower_dir_dentry), lower_dentry, |
db2e747b | 470 | encoded_symname); |
237fead6 | 471 | kfree(encoded_symname); |
2b0143b5 | 472 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 473 | goto out_lock; |
5ccf9203 | 474 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
475 | if (rc) |
476 | goto out_lock; | |
2b0143b5 DH |
477 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
478 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
479 | out_lock: |
480 | unlock_dir(lower_dir_dentry); | |
481 | dput(lower_dentry); | |
2b0143b5 | 482 | if (d_really_is_negative(dentry)) |
237fead6 MH |
483 | d_drop(dentry); |
484 | return rc; | |
485 | } | |
486 | ||
18bb1db3 | 487 | static int ecryptfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
237fead6 MH |
488 | { |
489 | int rc; | |
490 | struct dentry *lower_dentry; | |
491 | struct dentry *lower_dir_dentry; | |
492 | ||
493 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
494 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
495 | rc = vfs_mkdir(d_inode(lower_dir_dentry), lower_dentry, mode); |
496 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 497 | goto out; |
5ccf9203 | 498 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
499 | if (rc) |
500 | goto out; | |
2b0143b5 DH |
501 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
502 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
503 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
504 | out: |
505 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 506 | if (d_really_is_negative(dentry)) |
237fead6 MH |
507 | d_drop(dentry); |
508 | return rc; | |
509 | } | |
510 | ||
511 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
512 | { | |
237fead6 | 513 | struct dentry *lower_dentry; |
237fead6 | 514 | struct dentry *lower_dir_dentry; |
45ec4aba | 515 | int rc; |
237fead6 MH |
516 | |
517 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
45ec4aba | 518 | dget(dentry); |
237fead6 | 519 | lower_dir_dentry = lock_parent(lower_dentry); |
45ec4aba | 520 | dget(lower_dentry); |
2b0143b5 | 521 | rc = vfs_rmdir(d_inode(lower_dir_dentry), lower_dentry); |
45ec4aba | 522 | dput(lower_dentry); |
2b0143b5 DH |
523 | if (!rc && d_really_is_positive(dentry)) |
524 | clear_nlink(d_inode(dentry)); | |
525 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); | |
526 | set_nlink(dir, d_inode(lower_dir_dentry)->i_nlink); | |
237fead6 MH |
527 | unlock_dir(lower_dir_dentry); |
528 | if (!rc) | |
529 | d_drop(dentry); | |
45ec4aba | 530 | dput(dentry); |
237fead6 MH |
531 | return rc; |
532 | } | |
533 | ||
534 | static int | |
1a67aafb | 535 | ecryptfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
237fead6 MH |
536 | { |
537 | int rc; | |
538 | struct dentry *lower_dentry; | |
539 | struct dentry *lower_dir_dentry; | |
540 | ||
541 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
542 | lower_dir_dentry = lock_parent(lower_dentry); | |
2b0143b5 DH |
543 | rc = vfs_mknod(d_inode(lower_dir_dentry), lower_dentry, mode, dev); |
544 | if (rc || d_really_is_negative(lower_dentry)) | |
237fead6 | 545 | goto out; |
5ccf9203 | 546 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
547 | if (rc) |
548 | goto out; | |
2b0143b5 DH |
549 | fsstack_copy_attr_times(dir, d_inode(lower_dir_dentry)); |
550 | fsstack_copy_inode_size(dir, d_inode(lower_dir_dentry)); | |
237fead6 MH |
551 | out: |
552 | unlock_dir(lower_dir_dentry); | |
2b0143b5 | 553 | if (d_really_is_negative(dentry)) |
237fead6 MH |
554 | d_drop(dentry); |
555 | return rc; | |
556 | } | |
557 | ||
558 | static int | |
559 | ecryptfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1cd66c93 MS |
560 | struct inode *new_dir, struct dentry *new_dentry, |
561 | unsigned int flags) | |
237fead6 MH |
562 | { |
563 | int rc; | |
564 | struct dentry *lower_old_dentry; | |
565 | struct dentry *lower_new_dentry; | |
566 | struct dentry *lower_old_dir_dentry; | |
567 | struct dentry *lower_new_dir_dentry; | |
0d132f73 | 568 | struct dentry *trap = NULL; |
8335eafc | 569 | struct inode *target_inode; |
237fead6 | 570 | |
1cd66c93 MS |
571 | if (flags) |
572 | return -EINVAL; | |
573 | ||
237fead6 MH |
574 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
575 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
576 | dget(lower_old_dentry); | |
577 | dget(lower_new_dentry); | |
578 | lower_old_dir_dentry = dget_parent(lower_old_dentry); | |
579 | lower_new_dir_dentry = dget_parent(lower_new_dentry); | |
2b0143b5 | 580 | target_inode = d_inode(new_dentry); |
0d132f73 | 581 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
74dd7c97 AV |
582 | rc = -EINVAL; |
583 | if (lower_old_dentry->d_parent != lower_old_dir_dentry) | |
584 | goto out_lock; | |
585 | if (lower_new_dentry->d_parent != lower_new_dir_dentry) | |
586 | goto out_lock; | |
587 | if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) | |
588 | goto out_lock; | |
0d132f73 | 589 | /* source should not be ancestor of target */ |
74dd7c97 | 590 | if (trap == lower_old_dentry) |
0d132f73 | 591 | goto out_lock; |
0d132f73 EZ |
592 | /* target should not be ancestor of source */ |
593 | if (trap == lower_new_dentry) { | |
594 | rc = -ENOTEMPTY; | |
595 | goto out_lock; | |
596 | } | |
2b0143b5 DH |
597 | rc = vfs_rename(d_inode(lower_old_dir_dentry), lower_old_dentry, |
598 | d_inode(lower_new_dir_dentry), lower_new_dentry, | |
520c8b16 | 599 | NULL, 0); |
237fead6 MH |
600 | if (rc) |
601 | goto out_lock; | |
8335eafc TH |
602 | if (target_inode) |
603 | fsstack_copy_attr_all(target_inode, | |
604 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 605 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 606 | if (new_dir != old_dir) |
2b0143b5 | 607 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 MH |
608 | out_lock: |
609 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); | |
dd55c898 TH |
610 | dput(lower_new_dir_dentry); |
611 | dput(lower_old_dir_dentry); | |
237fead6 MH |
612 | dput(lower_new_dentry); |
613 | dput(lower_old_dentry); | |
614 | return rc; | |
615 | } | |
616 | ||
b22e8fed | 617 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 618 | { |
6c988f57 | 619 | DEFINE_DELAYED_CALL(done); |
3a60a168 | 620 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
6c988f57 | 621 | const char *link; |
b22e8fed | 622 | char *buf; |
addd65ad | 623 | int rc; |
237fead6 | 624 | |
6c988f57 MS |
625 | link = vfs_get_link(lower_dentry, &done); |
626 | if (IS_ERR(link)) | |
627 | return ERR_CAST(link); | |
628 | ||
b22e8fed | 629 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
6c988f57 MS |
630 | link, strlen(link)); |
631 | do_delayed_call(&done); | |
632 | if (rc) | |
633 | return ERR_PTR(rc); | |
634 | ||
635 | return buf; | |
3a60a168 TH |
636 | } |
637 | ||
6b255391 | 638 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
639 | struct inode *inode, |
640 | struct delayed_call *done) | |
3a60a168 | 641 | { |
b22e8fed | 642 | size_t len; |
6b255391 AV |
643 | char *buf; |
644 | ||
645 | if (!dentry) | |
646 | return ERR_PTR(-ECHILD); | |
647 | ||
648 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 649 | if (IS_ERR(buf)) |
680baacb | 650 | return buf; |
2b0143b5 DH |
651 | fsstack_copy_attr_atime(d_inode(dentry), |
652 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 653 | buf[len] = '\0'; |
fceef393 AV |
654 | set_delayed_call(done, kfree_link, buf); |
655 | return buf; | |
237fead6 MH |
656 | } |
657 | ||
237fead6 MH |
658 | /** |
659 | * upper_size_to_lower_size | |
660 | * @crypt_stat: Crypt_stat associated with file | |
661 | * @upper_size: Size of the upper file | |
662 | * | |
cc11beff | 663 | * Calculate the required size of the lower file based on the |
237fead6 MH |
664 | * specified size of the upper file. This calculation is based on the |
665 | * number of headers in the underlying file and the extent size. | |
666 | * | |
667 | * Returns Calculated size of the lower file. | |
668 | */ | |
669 | static loff_t | |
670 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
671 | loff_t upper_size) | |
672 | { | |
673 | loff_t lower_size; | |
674 | ||
157f1071 | 675 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
676 | if (upper_size != 0) { |
677 | loff_t num_extents; | |
678 | ||
679 | num_extents = upper_size >> crypt_stat->extent_shift; | |
680 | if (upper_size & ~crypt_stat->extent_mask) | |
681 | num_extents++; | |
682 | lower_size += (num_extents * crypt_stat->extent_size); | |
683 | } | |
684 | return lower_size; | |
685 | } | |
686 | ||
687 | /** | |
5f3ef64f | 688 | * truncate_upper |
237fead6 | 689 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
690 | * @ia: Address of the ecryptfs inode's attributes |
691 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
692 | * |
693 | * Function to handle truncations modifying the size of the file. Note | |
694 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
695 | * writing strings of 0's out. When truncating, we truncate the upper |
696 | * inode and update the lower_ia according to the page index | |
697 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
698 | * the caller must use lower_ia in a call to notify_change() to perform | |
699 | * the truncation of the lower inode. | |
237fead6 MH |
700 | * |
701 | * Returns zero on success; non-zero otherwise | |
702 | */ | |
5f3ef64f TH |
703 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
704 | struct iattr *lower_ia) | |
237fead6 MH |
705 | { |
706 | int rc = 0; | |
2b0143b5 | 707 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
708 | struct ecryptfs_crypt_stat *crypt_stat; |
709 | loff_t i_size = i_size_read(inode); | |
710 | loff_t lower_size_before_truncate; | |
711 | loff_t lower_size_after_truncate; | |
712 | ||
5f3ef64f TH |
713 | if (unlikely((ia->ia_size == i_size))) { |
714 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 715 | return 0; |
5f3ef64f | 716 | } |
3b06b3eb | 717 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
718 | if (rc) |
719 | return rc; | |
2b0143b5 | 720 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 721 | /* Switch on growing or shrinking file */ |
5f3ef64f | 722 | if (ia->ia_size > i_size) { |
2ed92554 MH |
723 | char zero[] = { 0x00 }; |
724 | ||
5f3ef64f | 725 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
726 | /* Write a single 0 at the last position of the file; |
727 | * this triggers code that will fill in 0's throughout | |
728 | * the intermediate portion of the previous end of the | |
729 | * file and the new and of the file */ | |
48c1e44a | 730 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
731 | (ia->ia_size - 1), 1); |
732 | } else { /* ia->ia_size < i_size_read(inode) */ | |
733 | /* We're chopping off all the pages down to the page | |
734 | * in which ia->ia_size is located. Fill in the end of | |
ea1754a0 KS |
735 | * that page from (ia->ia_size & ~PAGE_MASK) to |
736 | * PAGE_SIZE with zeros. */ | |
09cbfeaf KS |
737 | size_t num_zeros = (PAGE_SIZE |
738 | - (ia->ia_size & ~PAGE_MASK)); | |
2ed92554 | 739 | |
13a791b4 | 740 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 741 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
742 | lower_ia->ia_size = ia->ia_size; |
743 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 744 | goto out; |
13a791b4 | 745 | } |
2ed92554 MH |
746 | if (num_zeros) { |
747 | char *zeros_virt; | |
748 | ||
749 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
750 | if (!zeros_virt) { | |
751 | rc = -ENOMEM; | |
48c1e44a | 752 | goto out; |
2ed92554 | 753 | } |
48c1e44a | 754 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 755 | ia->ia_size, num_zeros); |
2ed92554 | 756 | kfree(zeros_virt); |
5dda6992 | 757 | if (rc) { |
240e2df5 MH |
758 | printk(KERN_ERR "Error attempting to zero out " |
759 | "the remainder of the end page on " | |
760 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 761 | goto out; |
240e2df5 MH |
762 | } |
763 | } | |
2c27c65e | 764 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 765 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
766 | if (rc) { |
767 | printk(KERN_ERR "Problem with " | |
768 | "ecryptfs_write_inode_size_to_metadata; " | |
769 | "rc = [%d]\n", rc); | |
48c1e44a | 770 | goto out; |
dd2a3b7a | 771 | } |
237fead6 MH |
772 | /* We are reducing the size of the ecryptfs file, and need to |
773 | * know if we need to reduce the size of the lower file. */ | |
774 | lower_size_before_truncate = | |
775 | upper_size_to_lower_size(crypt_stat, i_size); | |
776 | lower_size_after_truncate = | |
5f3ef64f TH |
777 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
778 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
779 | lower_ia->ia_size = lower_size_after_truncate; | |
780 | lower_ia->ia_valid |= ATTR_SIZE; | |
781 | } else | |
782 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 783 | } |
237fead6 | 784 | out: |
332ab16f | 785 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
786 | return rc; |
787 | } | |
788 | ||
a261a039 TH |
789 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
790 | { | |
791 | struct ecryptfs_crypt_stat *crypt_stat; | |
792 | loff_t lower_oldsize, lower_newsize; | |
793 | ||
794 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
795 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
796 | i_size_read(inode)); | |
797 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
798 | if (lower_newsize > lower_oldsize) { | |
799 | /* | |
800 | * The eCryptfs inode and the new *lower* size are mixed here | |
801 | * because we may not have the lower i_mutex held and/or it may | |
802 | * not be appropriate to call inode_newsize_ok() with inodes | |
803 | * from other filesystems. | |
804 | */ | |
805 | return inode_newsize_ok(inode, lower_newsize); | |
806 | } | |
807 | ||
808 | return 0; | |
809 | } | |
810 | ||
5f3ef64f TH |
811 | /** |
812 | * ecryptfs_truncate | |
813 | * @dentry: The ecryptfs layer dentry | |
814 | * @new_length: The length to expand the file to | |
815 | * | |
816 | * Simple function that handles the truncation of an eCryptfs inode and | |
817 | * its corresponding lower inode. | |
818 | * | |
819 | * Returns zero on success; non-zero otherwise | |
820 | */ | |
821 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
822 | { | |
823 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
824 | struct iattr lower_ia = { .ia_valid = 0 }; | |
825 | int rc; | |
826 | ||
2b0143b5 | 827 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
828 | if (rc) |
829 | return rc; | |
830 | ||
5f3ef64f TH |
831 | rc = truncate_upper(dentry, &ia, &lower_ia); |
832 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
833 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
834 | ||
5955102c | 835 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 836 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 837 | inode_unlock(d_inode(lower_dentry)); |
5f3ef64f TH |
838 | } |
839 | return rc; | |
840 | } | |
841 | ||
237fead6 | 842 | static int |
10556cb2 | 843 | ecryptfs_permission(struct inode *inode, int mask) |
237fead6 | 844 | { |
f419a2e3 | 845 | return inode_permission(ecryptfs_inode_to_lower(inode), mask); |
237fead6 MH |
846 | } |
847 | ||
848 | /** | |
849 | * ecryptfs_setattr | |
850 | * @dentry: dentry handle to the inode to modify | |
851 | * @ia: Structure with flags of what to change and values | |
852 | * | |
853 | * Updates the metadata of an inode. If the update is to the size | |
854 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
855 | * of both the ecryptfs inode and the lower inode. | |
856 | * | |
857 | * All other metadata changes will be passed right to the lower filesystem, | |
858 | * and we will just update our inode to look like the lower. | |
859 | */ | |
860 | static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia) | |
861 | { | |
862 | int rc = 0; | |
863 | struct dentry *lower_dentry; | |
5f3ef64f | 864 | struct iattr lower_ia; |
237fead6 MH |
865 | struct inode *inode; |
866 | struct inode *lower_inode; | |
867 | struct ecryptfs_crypt_stat *crypt_stat; | |
868 | ||
2b0143b5 | 869 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e81f3340 HX |
870 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { |
871 | rc = ecryptfs_init_crypt_stat(crypt_stat); | |
872 | if (rc) | |
873 | return rc; | |
874 | } | |
2b0143b5 | 875 | inode = d_inode(dentry); |
237fead6 | 876 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
877 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
878 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 879 | if (d_is_dir(dentry)) |
e10f281b | 880 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 881 | else if (d_is_reg(dentry) |
64ee4808 MH |
882 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
883 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 884 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 885 | |
e10f281b MH |
886 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
887 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 888 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
889 | if (rc) { |
890 | mutex_unlock(&crypt_stat->cs_mutex); | |
891 | goto out; | |
892 | } | |
d7cdc5fe | 893 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 894 | ecryptfs_put_lower_file(inode); |
5dda6992 | 895 | if (rc) { |
e10f281b MH |
896 | if (!(mount_crypt_stat->flags |
897 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
898 | rc = -EIO; | |
25bd8174 | 899 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 900 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
901 | "or the key could not be retrieved. " |
902 | "Plaintext passthrough mode is not " | |
e10f281b | 903 | "enabled; returning -EIO\n"); |
e10f281b | 904 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
905 | goto out; |
906 | } | |
907 | rc = 0; | |
3aeb86ea TH |
908 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
909 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 910 | } |
e10f281b MH |
911 | } |
912 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 | 913 | |
31051c85 | 914 | rc = setattr_prepare(dentry, ia); |
a261a039 TH |
915 | if (rc) |
916 | goto out; | |
917 | if (ia->ia_valid & ATTR_SIZE) { | |
918 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
919 | if (rc) | |
920 | goto out; | |
921 | } | |
922 | ||
5f3ef64f TH |
923 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
924 | if (ia->ia_valid & ATTR_FILE) | |
925 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 926 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 927 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
928 | if (rc < 0) |
929 | goto out; | |
930 | } | |
1ac564ec JL |
931 | |
932 | /* | |
933 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
934 | * to interpret this in its own way. | |
935 | */ | |
5f3ef64f TH |
936 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
937 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 938 | |
5955102c | 939 | inode_lock(d_inode(lower_dentry)); |
27ac0ffe | 940 | rc = notify_change(lower_dentry, &lower_ia, NULL); |
5955102c | 941 | inode_unlock(d_inode(lower_dentry)); |
237fead6 | 942 | out: |
9afa2fb6 | 943 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
944 | return rc; |
945 | } | |
946 | ||
a528d35e DH |
947 | static int ecryptfs_getattr_link(const struct path *path, struct kstat *stat, |
948 | u32 request_mask, unsigned int flags) | |
3a60a168 | 949 | { |
a528d35e | 950 | struct dentry *dentry = path->dentry; |
3a60a168 TH |
951 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
952 | int rc = 0; | |
953 | ||
954 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
955 | dentry->d_sb)->mount_crypt_stat; | |
2b0143b5 | 956 | generic_fillattr(d_inode(dentry), stat); |
3a60a168 TH |
957 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
958 | char *target; | |
959 | size_t targetsiz; | |
960 | ||
b22e8fed AV |
961 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
962 | if (!IS_ERR(target)) { | |
3a60a168 TH |
963 | kfree(target); |
964 | stat->size = targetsiz; | |
b22e8fed AV |
965 | } else { |
966 | rc = PTR_ERR(target); | |
3a60a168 TH |
967 | } |
968 | } | |
969 | return rc; | |
970 | } | |
971 | ||
a528d35e DH |
972 | static int ecryptfs_getattr(const struct path *path, struct kstat *stat, |
973 | u32 request_mask, unsigned int flags) | |
f8f484d1 | 974 | { |
a528d35e | 975 | struct dentry *dentry = path->dentry; |
f8f484d1 TH |
976 | struct kstat lower_stat; |
977 | int rc; | |
978 | ||
a528d35e DH |
979 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, |
980 | request_mask, flags); | |
f8f484d1 | 981 | if (!rc) { |
2b0143b5 DH |
982 | fsstack_copy_attr_all(d_inode(dentry), |
983 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
984 | generic_fillattr(d_inode(dentry), stat); | |
f8f484d1 TH |
985 | stat->blocks = lower_stat.blocks; |
986 | } | |
987 | return rc; | |
988 | } | |
989 | ||
dd2a3b7a | 990 | int |
3767e255 AV |
991 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, |
992 | const char *name, const void *value, | |
237fead6 MH |
993 | size_t size, int flags) |
994 | { | |
5d6c3191 | 995 | int rc; |
237fead6 MH |
996 | struct dentry *lower_dentry; |
997 | ||
998 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
5d6c3191 | 999 | if (!(d_inode(lower_dentry)->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1000 | rc = -EOPNOTSUPP; |
237fead6 MH |
1001 | goto out; |
1002 | } | |
48b512e6 | 1003 | rc = vfs_setxattr(lower_dentry, name, value, size, flags); |
3767e255 AV |
1004 | if (!rc && inode) |
1005 | fsstack_copy_attr_all(inode, d_inode(lower_dentry)); | |
237fead6 MH |
1006 | out: |
1007 | return rc; | |
1008 | } | |
1009 | ||
d7cdc5fe | 1010 | ssize_t |
ce23e640 AV |
1011 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
1012 | const char *name, void *value, size_t size) | |
d7cdc5fe | 1013 | { |
5d6c3191 | 1014 | int rc; |
d7cdc5fe | 1015 | |
5d6c3191 | 1016 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1017 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1018 | goto out; |
1019 | } | |
ce23e640 | 1020 | inode_lock(lower_inode); |
5d6c3191 | 1021 | rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); |
ce23e640 | 1022 | inode_unlock(lower_inode); |
d7cdc5fe MH |
1023 | out: |
1024 | return rc; | |
1025 | } | |
1026 | ||
7896b631 | 1027 | static ssize_t |
ce23e640 AV |
1028 | ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, |
1029 | const char *name, void *value, size_t size) | |
237fead6 | 1030 | { |
ce23e640 AV |
1031 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), |
1032 | ecryptfs_inode_to_lower(inode), | |
1033 | name, value, size); | |
237fead6 MH |
1034 | } |
1035 | ||
1036 | static ssize_t | |
1037 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1038 | { | |
1039 | int rc = 0; | |
1040 | struct dentry *lower_dentry; | |
1041 | ||
1042 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1043 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1044 | rc = -EOPNOTSUPP; |
237fead6 MH |
1045 | goto out; |
1046 | } | |
5955102c | 1047 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1048 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
5955102c | 1049 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1050 | out: |
1051 | return rc; | |
1052 | } | |
1053 | ||
4b899da5 AG |
1054 | static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, |
1055 | const char *name) | |
237fead6 | 1056 | { |
5d6c3191 | 1057 | int rc; |
237fead6 | 1058 | struct dentry *lower_dentry; |
4b899da5 | 1059 | struct inode *lower_inode; |
237fead6 MH |
1060 | |
1061 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
4b899da5 | 1062 | lower_inode = ecryptfs_inode_to_lower(inode); |
5d6c3191 | 1063 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1064 | rc = -EOPNOTSUPP; |
237fead6 MH |
1065 | goto out; |
1066 | } | |
4b899da5 | 1067 | inode_lock(lower_inode); |
5d6c3191 | 1068 | rc = __vfs_removexattr(lower_dentry, name); |
4b899da5 | 1069 | inode_unlock(lower_inode); |
237fead6 MH |
1070 | out: |
1071 | return rc; | |
1072 | } | |
1073 | ||
754661f1 | 1074 | const struct inode_operations ecryptfs_symlink_iops = { |
6b255391 | 1075 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1076 | .permission = ecryptfs_permission, |
1077 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1078 | .getattr = ecryptfs_getattr_link, |
237fead6 | 1079 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1080 | }; |
1081 | ||
754661f1 | 1082 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1083 | .create = ecryptfs_create, |
1084 | .lookup = ecryptfs_lookup, | |
1085 | .link = ecryptfs_link, | |
1086 | .unlink = ecryptfs_unlink, | |
1087 | .symlink = ecryptfs_symlink, | |
1088 | .mkdir = ecryptfs_mkdir, | |
1089 | .rmdir = ecryptfs_rmdir, | |
1090 | .mknod = ecryptfs_mknod, | |
1091 | .rename = ecryptfs_rename, | |
1092 | .permission = ecryptfs_permission, | |
1093 | .setattr = ecryptfs_setattr, | |
237fead6 | 1094 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1095 | }; |
1096 | ||
754661f1 | 1097 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1098 | .permission = ecryptfs_permission, |
1099 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1100 | .getattr = ecryptfs_getattr, |
237fead6 | 1101 | .listxattr = ecryptfs_listxattr, |
4b899da5 AG |
1102 | }; |
1103 | ||
1104 | static int ecryptfs_xattr_get(const struct xattr_handler *handler, | |
1105 | struct dentry *dentry, struct inode *inode, | |
1106 | const char *name, void *buffer, size_t size) | |
1107 | { | |
1108 | return ecryptfs_getxattr(dentry, inode, name, buffer, size); | |
1109 | } | |
1110 | ||
1111 | static int ecryptfs_xattr_set(const struct xattr_handler *handler, | |
1112 | struct dentry *dentry, struct inode *inode, | |
1113 | const char *name, const void *value, size_t size, | |
1114 | int flags) | |
1115 | { | |
1116 | if (value) | |
1117 | return ecryptfs_setxattr(dentry, inode, name, value, size, flags); | |
1118 | else { | |
1119 | BUG_ON(flags != XATTR_REPLACE); | |
1120 | return ecryptfs_removexattr(dentry, inode, name); | |
1121 | } | |
1122 | } | |
1123 | ||
c036061b | 1124 | static const struct xattr_handler ecryptfs_xattr_handler = { |
4b899da5 AG |
1125 | .prefix = "", /* match anything */ |
1126 | .get = ecryptfs_xattr_get, | |
1127 | .set = ecryptfs_xattr_set, | |
1128 | }; | |
1129 | ||
1130 | const struct xattr_handler *ecryptfs_xattr_handlers[] = { | |
1131 | &ecryptfs_xattr_handler, | |
1132 | NULL | |
237fead6 | 1133 | }; |