Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d17074ac | 2 | /* |
237fead6 MH |
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> |
af84016f CB |
21 | #include <linux/posix_acl.h> |
22 | #include <linux/posix_acl_xattr.h> | |
97e2dee9 | 23 | #include <linux/fileattr.h> |
0a688ad7 | 24 | #include <asm/unaligned.h> |
237fead6 MH |
25 | #include "ecryptfs_kernel.h" |
26 | ||
b2648d51 AV |
27 | static int lock_parent(struct dentry *dentry, |
28 | struct dentry **lower_dentry, | |
29 | struct inode **lower_dir) | |
237fead6 | 30 | { |
b2648d51 | 31 | struct dentry *lower_dir_dentry; |
237fead6 | 32 | |
b2648d51 AV |
33 | lower_dir_dentry = ecryptfs_dentry_to_lower(dentry->d_parent); |
34 | *lower_dir = d_inode(lower_dir_dentry); | |
35 | *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
237fead6 | 36 | |
b2648d51 AV |
37 | inode_lock_nested(*lower_dir, I_MUTEX_PARENT); |
38 | return (*lower_dentry)->d_parent == lower_dir_dentry ? 0 : -EINVAL; | |
237fead6 MH |
39 | } |
40 | ||
c4f79073 TH |
41 | static int ecryptfs_inode_test(struct inode *inode, void *lower_inode) |
42 | { | |
c4cf3ba4 | 43 | return ecryptfs_inode_to_lower(inode) == lower_inode; |
c4f79073 TH |
44 | } |
45 | ||
5ccf9203 | 46 | static int ecryptfs_inode_set(struct inode *inode, void *opaque) |
c4f79073 | 47 | { |
5ccf9203 TH |
48 | struct inode *lower_inode = opaque; |
49 | ||
50 | ecryptfs_set_inode_lower(inode, lower_inode); | |
51 | fsstack_copy_attr_all(inode, lower_inode); | |
52 | /* i_size will be overwritten for encrypted regular files */ | |
53 | fsstack_copy_inode_size(inode, lower_inode); | |
54 | inode->i_ino = lower_inode->i_ino; | |
c4f79073 | 55 | inode->i_mapping->a_ops = &ecryptfs_aops; |
5ccf9203 TH |
56 | |
57 | if (S_ISLNK(inode->i_mode)) | |
58 | inode->i_op = &ecryptfs_symlink_iops; | |
59 | else if (S_ISDIR(inode->i_mode)) | |
60 | inode->i_op = &ecryptfs_dir_iops; | |
61 | else | |
62 | inode->i_op = &ecryptfs_main_iops; | |
63 | ||
64 | if (S_ISDIR(inode->i_mode)) | |
65 | inode->i_fop = &ecryptfs_dir_fops; | |
66 | else if (special_file(inode->i_mode)) | |
67 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
68 | else | |
69 | inode->i_fop = &ecryptfs_main_fops; | |
70 | ||
c4f79073 TH |
71 | return 0; |
72 | } | |
73 | ||
5ccf9203 TH |
74 | static struct inode *__ecryptfs_get_inode(struct inode *lower_inode, |
75 | struct super_block *sb) | |
c4f79073 TH |
76 | { |
77 | struct inode *inode; | |
c4f79073 | 78 | |
5ccf9203 TH |
79 | if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) |
80 | return ERR_PTR(-EXDEV); | |
81 | if (!igrab(lower_inode)) | |
82 | return ERR_PTR(-ESTALE); | |
c4f79073 TH |
83 | inode = iget5_locked(sb, (unsigned long)lower_inode, |
84 | ecryptfs_inode_test, ecryptfs_inode_set, | |
85 | lower_inode); | |
86 | if (!inode) { | |
c4f79073 | 87 | iput(lower_inode); |
5ccf9203 | 88 | return ERR_PTR(-EACCES); |
c4f79073 | 89 | } |
5ccf9203 | 90 | if (!(inode->i_state & I_NEW)) |
c4f79073 | 91 | iput(lower_inode); |
5ccf9203 TH |
92 | |
93 | return inode; | |
94 | } | |
95 | ||
96 | struct inode *ecryptfs_get_inode(struct inode *lower_inode, | |
97 | struct super_block *sb) | |
98 | { | |
99 | struct inode *inode = __ecryptfs_get_inode(lower_inode, sb); | |
100 | ||
101 | if (!IS_ERR(inode) && (inode->i_state & I_NEW)) | |
102 | unlock_new_inode(inode); | |
103 | ||
c4f79073 | 104 | return inode; |
c4f79073 TH |
105 | } |
106 | ||
c4f79073 TH |
107 | /** |
108 | * ecryptfs_interpose | |
109 | * @lower_dentry: Existing dentry in the lower filesystem | |
110 | * @dentry: ecryptfs' dentry | |
111 | * @sb: ecryptfs's super_block | |
c4f79073 TH |
112 | * |
113 | * Interposes upper and lower dentries. | |
114 | * | |
115 | * Returns zero on success; non-zero otherwise | |
116 | */ | |
117 | static int ecryptfs_interpose(struct dentry *lower_dentry, | |
5ccf9203 | 118 | struct dentry *dentry, struct super_block *sb) |
c4f79073 | 119 | { |
2b0143b5 | 120 | struct inode *inode = ecryptfs_get_inode(d_inode(lower_dentry), sb); |
5ccf9203 | 121 | |
c4f79073 TH |
122 | if (IS_ERR(inode)) |
123 | return PTR_ERR(inode); | |
5ccf9203 TH |
124 | d_instantiate(dentry, inode); |
125 | ||
c4f79073 TH |
126 | return 0; |
127 | } | |
128 | ||
8bc2d3cf TH |
129 | static int ecryptfs_do_unlink(struct inode *dir, struct dentry *dentry, |
130 | struct inode *inode) | |
131 | { | |
b2648d51 AV |
132 | struct dentry *lower_dentry; |
133 | struct inode *lower_dir; | |
8bc2d3cf TH |
134 | int rc; |
135 | ||
b2648d51 | 136 | rc = lock_parent(dentry, &lower_dentry, &lower_dir); |
bcf0d9d4 | 137 | dget(lower_dentry); // don't even try to make the lower negative |
b2648d51 AV |
138 | if (!rc) { |
139 | if (d_unhashed(lower_dentry)) | |
140 | rc = -EINVAL; | |
141 | else | |
abf08576 | 142 | rc = vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry, |
b2648d51 AV |
143 | NULL); |
144 | } | |
8bc2d3cf TH |
145 | if (rc) { |
146 | printk(KERN_ERR "Error in vfs_unlink; rc = [%d]\n", rc); | |
147 | goto out_unlock; | |
148 | } | |
b2648d51 | 149 | fsstack_copy_attr_times(dir, lower_dir); |
8bc2d3cf TH |
150 | set_nlink(inode, ecryptfs_inode_to_lower(inode)->i_nlink); |
151 | inode->i_ctime = dir->i_ctime; | |
8bc2d3cf | 152 | out_unlock: |
8bc2d3cf | 153 | dput(lower_dentry); |
b2648d51 | 154 | inode_unlock(lower_dir); |
bcf0d9d4 AV |
155 | if (!rc) |
156 | d_drop(dentry); | |
8bc2d3cf TH |
157 | return rc; |
158 | } | |
159 | ||
237fead6 MH |
160 | /** |
161 | * ecryptfs_do_create | |
162 | * @directory_inode: inode of the new file's dentry's parent in ecryptfs | |
163 | * @ecryptfs_dentry: New file's dentry in ecryptfs | |
164 | * @mode: The mode of the new file | |
237fead6 MH |
165 | * |
166 | * Creates the underlying file and the eCryptfs inode which will link to | |
167 | * it. It will also update the eCryptfs directory inode to mimic the | |
168 | * stat of the lower directory inode. | |
169 | * | |
b59db43a | 170 | * Returns the new eCryptfs inode on success; an ERR_PTR on error condition |
237fead6 | 171 | */ |
b59db43a | 172 | static struct inode * |
237fead6 | 173 | ecryptfs_do_create(struct inode *directory_inode, |
175a4eb7 | 174 | struct dentry *ecryptfs_dentry, umode_t mode) |
237fead6 MH |
175 | { |
176 | int rc; | |
177 | struct dentry *lower_dentry; | |
b2648d51 | 178 | struct inode *lower_dir; |
b59db43a | 179 | struct inode *inode; |
237fead6 | 180 | |
b2648d51 AV |
181 | rc = lock_parent(ecryptfs_dentry, &lower_dentry, &lower_dir); |
182 | if (!rc) | |
abf08576 | 183 | rc = vfs_create(&nop_mnt_idmap, lower_dir, |
b2648d51 | 184 | lower_dentry, mode, true); |
4981e081 | 185 | if (rc) { |
caeeeecf | 186 | printk(KERN_ERR "%s: Failure to create dentry in lower fs; " |
18d1dbf1 | 187 | "rc = [%d]\n", __func__, rc); |
b59db43a | 188 | inode = ERR_PTR(rc); |
caeeeecf | 189 | goto out_lock; |
237fead6 | 190 | } |
2b0143b5 | 191 | inode = __ecryptfs_get_inode(d_inode(lower_dentry), |
b59db43a | 192 | directory_inode->i_sb); |
8bc2d3cf | 193 | if (IS_ERR(inode)) { |
abf08576 | 194 | vfs_unlink(&nop_mnt_idmap, lower_dir, lower_dentry, NULL); |
237fead6 | 195 | goto out_lock; |
8bc2d3cf | 196 | } |
b2648d51 AV |
197 | fsstack_copy_attr_times(directory_inode, lower_dir); |
198 | fsstack_copy_inode_size(directory_inode, lower_dir); | |
237fead6 | 199 | out_lock: |
b2648d51 | 200 | inode_unlock(lower_dir); |
b59db43a | 201 | return inode; |
237fead6 MH |
202 | } |
203 | ||
d17074ac | 204 | /* |
237fead6 MH |
205 | * ecryptfs_initialize_file |
206 | * | |
207 | * Cause the file to be changed from a basic empty file to an ecryptfs | |
208 | * file with a header and first data page. | |
209 | * | |
210 | * Returns zero on success | |
211 | */ | |
e3ccaa97 TH |
212 | int ecryptfs_initialize_file(struct dentry *ecryptfs_dentry, |
213 | struct inode *ecryptfs_inode) | |
237fead6 | 214 | { |
d7cdc5fe | 215 | struct ecryptfs_crypt_stat *crypt_stat = |
b59db43a | 216 | &ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat; |
237fead6 | 217 | int rc = 0; |
237fead6 | 218 | |
b59db43a | 219 | if (S_ISDIR(ecryptfs_inode->i_mode)) { |
237fead6 | 220 | ecryptfs_printk(KERN_DEBUG, "This is a directory\n"); |
e2bd99ec | 221 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
d7cdc5fe | 222 | goto out; |
237fead6 | 223 | } |
237fead6 | 224 | ecryptfs_printk(KERN_DEBUG, "Initializing crypto context\n"); |
b59db43a | 225 | rc = ecryptfs_new_file_context(ecryptfs_inode); |
237fead6 | 226 | if (rc) { |
d7cdc5fe MH |
227 | ecryptfs_printk(KERN_ERR, "Error creating new file " |
228 | "context; rc = [%d]\n", rc); | |
229 | goto out; | |
237fead6 | 230 | } |
b59db43a | 231 | rc = ecryptfs_get_lower_file(ecryptfs_dentry, ecryptfs_inode); |
27992890 RS |
232 | if (rc) { |
233 | printk(KERN_ERR "%s: Error attempting to initialize " | |
332ab16f | 234 | "the lower file for the dentry with name " |
9e78d14a DH |
235 | "[%pd]; rc = [%d]\n", __func__, |
236 | ecryptfs_dentry, rc); | |
27992890 | 237 | goto out; |
391b52f9 | 238 | } |
b59db43a | 239 | rc = ecryptfs_write_metadata(ecryptfs_dentry, ecryptfs_inode); |
332ab16f | 240 | if (rc) |
d7cdc5fe | 241 | printk(KERN_ERR "Error writing headers; rc = [%d]\n", rc); |
b59db43a | 242 | ecryptfs_put_lower_file(ecryptfs_inode); |
237fead6 MH |
243 | out: |
244 | return rc; | |
245 | } | |
246 | ||
d17074ac | 247 | /* |
237fead6 | 248 | * ecryptfs_create |
237fead6 | 249 | * @mode: The mode of the new file. |
237fead6 MH |
250 | * |
251 | * Creates a new file. | |
252 | * | |
253 | * Returns zero on success; non-zero on error condition | |
254 | */ | |
255 | static int | |
549c7297 CB |
256 | ecryptfs_create(struct user_namespace *mnt_userns, |
257 | struct inode *directory_inode, struct dentry *ecryptfs_dentry, | |
ebfc3b49 | 258 | umode_t mode, bool excl) |
237fead6 | 259 | { |
b59db43a | 260 | struct inode *ecryptfs_inode; |
237fead6 MH |
261 | int rc; |
262 | ||
b59db43a TH |
263 | ecryptfs_inode = ecryptfs_do_create(directory_inode, ecryptfs_dentry, |
264 | mode); | |
a1c83681 | 265 | if (IS_ERR(ecryptfs_inode)) { |
237fead6 MH |
266 | ecryptfs_printk(KERN_WARNING, "Failed to create file in" |
267 | "lower filesystem\n"); | |
b59db43a | 268 | rc = PTR_ERR(ecryptfs_inode); |
237fead6 MH |
269 | goto out; |
270 | } | |
271 | /* At this point, a file exists on "disk"; we need to make sure | |
272 | * that this on disk file is prepared to be an ecryptfs file */ | |
b59db43a TH |
273 | rc = ecryptfs_initialize_file(ecryptfs_dentry, ecryptfs_inode); |
274 | if (rc) { | |
8bc2d3cf TH |
275 | ecryptfs_do_unlink(directory_inode, ecryptfs_dentry, |
276 | ecryptfs_inode); | |
0e81ba23 | 277 | iget_failed(ecryptfs_inode); |
b59db43a TH |
278 | goto out; |
279 | } | |
1e2e547a | 280 | d_instantiate_new(ecryptfs_dentry, ecryptfs_inode); |
237fead6 MH |
281 | out: |
282 | return rc; | |
283 | } | |
284 | ||
778aeb42 TH |
285 | static int ecryptfs_i_size_read(struct dentry *dentry, struct inode *inode) |
286 | { | |
287 | struct ecryptfs_crypt_stat *crypt_stat; | |
288 | int rc; | |
289 | ||
290 | rc = ecryptfs_get_lower_file(dentry, inode); | |
291 | if (rc) { | |
292 | printk(KERN_ERR "%s: Error attempting to initialize " | |
293 | "the lower file for the dentry with name " | |
9e78d14a DH |
294 | "[%pd]; rc = [%d]\n", __func__, |
295 | dentry, rc); | |
778aeb42 TH |
296 | return rc; |
297 | } | |
298 | ||
299 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
300 | /* TODO: lock for crypt_stat comparison */ | |
301 | if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) | |
302 | ecryptfs_set_default_sizes(crypt_stat); | |
303 | ||
304 | rc = ecryptfs_read_and_validate_header_region(inode); | |
305 | ecryptfs_put_lower_file(inode); | |
306 | if (rc) { | |
307 | rc = ecryptfs_read_and_validate_xattr_region(dentry, inode); | |
308 | if (!rc) | |
309 | crypt_stat->flags |= ECRYPTFS_METADATA_IN_XATTR; | |
310 | } | |
311 | ||
312 | /* Must return 0 to allow non-eCryptfs files to be looked up, too */ | |
313 | return 0; | |
314 | } | |
315 | ||
d17074ac | 316 | /* |
5ccf9203 | 317 | * ecryptfs_lookup_interpose - Dentry interposition for a lookup |
237fead6 | 318 | */ |
b1168a92 AV |
319 | static struct dentry *ecryptfs_lookup_interpose(struct dentry *dentry, |
320 | struct dentry *lower_dentry) | |
237fead6 | 321 | { |
88569546 | 322 | const struct path *path = ecryptfs_dentry_to_lower_path(dentry->d_parent); |
e72b9dd6 | 323 | struct inode *inode, *lower_inode; |
778aeb42 | 324 | struct ecryptfs_dentry_info *dentry_info; |
778aeb42 TH |
325 | int rc = 0; |
326 | ||
778aeb42 | 327 | dentry_info = kmem_cache_alloc(ecryptfs_dentry_info_cache, GFP_KERNEL); |
778aeb42 | 328 | if (!dentry_info) { |
778aeb42 | 329 | dput(lower_dentry); |
b1168a92 | 330 | return ERR_PTR(-ENOMEM); |
237fead6 | 331 | } |
0b1d9011 | 332 | |
b1168a92 | 333 | fsstack_copy_attr_atime(d_inode(dentry->d_parent), |
762c6968 | 334 | d_inode(path->dentry)); |
84d08fa8 | 335 | BUG_ON(!d_count(lower_dentry)); |
0b1d9011 AV |
336 | |
337 | ecryptfs_set_dentry_private(dentry, dentry_info); | |
762c6968 | 338 | dentry_info->lower_path.mnt = mntget(path->mnt); |
92dd1230 | 339 | dentry_info->lower_path.dentry = lower_dentry; |
778aeb42 | 340 | |
e72b9dd6 AV |
341 | /* |
342 | * negative dentry can go positive under us here - its parent is not | |
343 | * locked. That's OK and that could happen just as we return from | |
344 | * ecryptfs_lookup() anyway. Just need to be careful and fetch | |
345 | * ->d_inode only once - it's not stable here. | |
346 | */ | |
347 | lower_inode = READ_ONCE(lower_dentry->d_inode); | |
348 | ||
349 | if (!lower_inode) { | |
237fead6 | 350 | /* We want to add because we couldn't find in lower */ |
778aeb42 | 351 | d_add(dentry, NULL); |
b1168a92 | 352 | return NULL; |
237fead6 | 353 | } |
b1168a92 | 354 | inode = __ecryptfs_get_inode(lower_inode, dentry->d_sb); |
5ccf9203 | 355 | if (IS_ERR(inode)) { |
778aeb42 TH |
356 | printk(KERN_ERR "%s: Error interposing; rc = [%ld]\n", |
357 | __func__, PTR_ERR(inode)); | |
b1168a92 | 358 | return ERR_CAST(inode); |
391b52f9 | 359 | } |
778aeb42 TH |
360 | if (S_ISREG(inode->i_mode)) { |
361 | rc = ecryptfs_i_size_read(dentry, inode); | |
dd2a3b7a | 362 | if (rc) { |
778aeb42 | 363 | make_bad_inode(inode); |
b1168a92 | 364 | return ERR_PTR(rc); |
237fead6 | 365 | } |
237fead6 | 366 | } |
778aeb42 | 367 | |
3b06b3eb TH |
368 | if (inode->i_state & I_NEW) |
369 | unlock_new_inode(inode); | |
b1168a92 | 370 | return d_splice_alias(inode, dentry); |
addd65ad MH |
371 | } |
372 | ||
373 | /** | |
374 | * ecryptfs_lookup | |
375 | * @ecryptfs_dir_inode: The eCryptfs directory inode | |
376 | * @ecryptfs_dentry: The eCryptfs dentry that we are looking up | |
89076bc3 | 377 | * @flags: lookup flags |
addd65ad MH |
378 | * |
379 | * Find a file on disk. If the file does not exist, then we'll add it to the | |
380 | * dentry cache and continue on to read it from the disk. | |
381 | */ | |
382 | static struct dentry *ecryptfs_lookup(struct inode *ecryptfs_dir_inode, | |
383 | struct dentry *ecryptfs_dentry, | |
00cd8dd3 | 384 | unsigned int flags) |
addd65ad MH |
385 | { |
386 | char *encrypted_and_encoded_name = NULL; | |
88ae4ab9 | 387 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
addd65ad | 388 | struct dentry *lower_dir_dentry, *lower_dentry; |
88ae4ab9 AV |
389 | const char *name = ecryptfs_dentry->d_name.name; |
390 | size_t len = ecryptfs_dentry->d_name.len; | |
b1168a92 | 391 | struct dentry *res; |
addd65ad MH |
392 | int rc = 0; |
393 | ||
addd65ad | 394 | lower_dir_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry->d_parent); |
88ae4ab9 | 395 | |
2aac0cf8 TH |
396 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
397 | ecryptfs_dentry->d_sb)->mount_crypt_stat; | |
ab13a921 | 398 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
88ae4ab9 AV |
399 | rc = ecryptfs_encrypt_and_encode_filename( |
400 | &encrypted_and_encoded_name, &len, | |
401 | mount_crypt_stat, name, len); | |
402 | if (rc) { | |
403 | printk(KERN_ERR "%s: Error attempting to encrypt and encode " | |
404 | "filename; rc = [%d]\n", __func__, rc); | |
405 | return ERR_PTR(rc); | |
406 | } | |
407 | name = encrypted_and_encoded_name; | |
addd65ad | 408 | } |
88ae4ab9 AV |
409 | |
410 | lower_dentry = lookup_one_len_unlocked(name, lower_dir_dentry, len); | |
addd65ad | 411 | if (IS_ERR(lower_dentry)) { |
8787c7a3 | 412 | ecryptfs_printk(KERN_DEBUG, "%s: lookup_one_len() returned " |
b1168a92 AV |
413 | "[%ld] on lower_dentry = [%s]\n", __func__, |
414 | PTR_ERR(lower_dentry), | |
88ae4ab9 | 415 | name); |
b1168a92 | 416 | res = ERR_CAST(lower_dentry); |
88ae4ab9 AV |
417 | } else { |
418 | res = ecryptfs_lookup_interpose(ecryptfs_dentry, lower_dentry); | |
addd65ad | 419 | } |
addd65ad | 420 | kfree(encrypted_and_encoded_name); |
b1168a92 | 421 | return res; |
237fead6 MH |
422 | } |
423 | ||
424 | static int ecryptfs_link(struct dentry *old_dentry, struct inode *dir, | |
425 | struct dentry *new_dentry) | |
426 | { | |
427 | struct dentry *lower_old_dentry; | |
428 | struct dentry *lower_new_dentry; | |
b2648d51 | 429 | struct inode *lower_dir; |
237fead6 MH |
430 | u64 file_size_save; |
431 | int rc; | |
432 | ||
2b0143b5 | 433 | file_size_save = i_size_read(d_inode(old_dentry)); |
237fead6 | 434 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
b2648d51 AV |
435 | rc = lock_parent(new_dentry, &lower_new_dentry, &lower_dir); |
436 | if (!rc) | |
abf08576 | 437 | rc = vfs_link(lower_old_dentry, &nop_mnt_idmap, lower_dir, |
b2648d51 | 438 | lower_new_dentry, NULL); |
2b0143b5 | 439 | if (rc || d_really_is_negative(lower_new_dentry)) |
237fead6 | 440 | goto out_lock; |
5ccf9203 | 441 | rc = ecryptfs_interpose(lower_new_dentry, new_dentry, dir->i_sb); |
237fead6 MH |
442 | if (rc) |
443 | goto out_lock; | |
b2648d51 AV |
444 | fsstack_copy_attr_times(dir, lower_dir); |
445 | fsstack_copy_inode_size(dir, lower_dir); | |
2b0143b5 DH |
446 | set_nlink(d_inode(old_dentry), |
447 | ecryptfs_inode_to_lower(d_inode(old_dentry))->i_nlink); | |
448 | i_size_write(d_inode(new_dentry), file_size_save); | |
237fead6 | 449 | out_lock: |
b2648d51 | 450 | inode_unlock(lower_dir); |
237fead6 MH |
451 | return rc; |
452 | } | |
453 | ||
454 | static int ecryptfs_unlink(struct inode *dir, struct dentry *dentry) | |
455 | { | |
2b0143b5 | 456 | return ecryptfs_do_unlink(dir, dentry, d_inode(dentry)); |
237fead6 MH |
457 | } |
458 | ||
549c7297 CB |
459 | static int ecryptfs_symlink(struct user_namespace *mnt_userns, |
460 | struct inode *dir, struct dentry *dentry, | |
237fead6 MH |
461 | const char *symname) |
462 | { | |
463 | int rc; | |
464 | struct dentry *lower_dentry; | |
b2648d51 | 465 | struct inode *lower_dir; |
237fead6 | 466 | char *encoded_symname; |
addd65ad MH |
467 | size_t encoded_symlen; |
468 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat = NULL; | |
237fead6 | 469 | |
b2648d51 AV |
470 | rc = lock_parent(dentry, &lower_dentry, &lower_dir); |
471 | if (rc) | |
472 | goto out_lock; | |
addd65ad MH |
473 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
474 | dir->i_sb)->mount_crypt_stat; | |
475 | rc = ecryptfs_encrypt_and_encode_filename(&encoded_symname, | |
476 | &encoded_symlen, | |
addd65ad MH |
477 | mount_crypt_stat, symname, |
478 | strlen(symname)); | |
479 | if (rc) | |
237fead6 | 480 | goto out_lock; |
abf08576 | 481 | rc = vfs_symlink(&nop_mnt_idmap, lower_dir, lower_dentry, |
db2e747b | 482 | encoded_symname); |
237fead6 | 483 | kfree(encoded_symname); |
2b0143b5 | 484 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 485 | goto out_lock; |
5ccf9203 | 486 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
487 | if (rc) |
488 | goto out_lock; | |
b2648d51 AV |
489 | fsstack_copy_attr_times(dir, lower_dir); |
490 | fsstack_copy_inode_size(dir, lower_dir); | |
237fead6 | 491 | out_lock: |
b2648d51 | 492 | inode_unlock(lower_dir); |
2b0143b5 | 493 | if (d_really_is_negative(dentry)) |
237fead6 MH |
494 | d_drop(dentry); |
495 | return rc; | |
496 | } | |
497 | ||
549c7297 CB |
498 | static int ecryptfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
499 | struct dentry *dentry, umode_t mode) | |
237fead6 MH |
500 | { |
501 | int rc; | |
502 | struct dentry *lower_dentry; | |
b2648d51 | 503 | struct inode *lower_dir; |
237fead6 | 504 | |
b2648d51 AV |
505 | rc = lock_parent(dentry, &lower_dentry, &lower_dir); |
506 | if (!rc) | |
abf08576 | 507 | rc = vfs_mkdir(&nop_mnt_idmap, lower_dir, |
b2648d51 | 508 | lower_dentry, mode); |
2b0143b5 | 509 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 510 | goto out; |
5ccf9203 | 511 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
512 | if (rc) |
513 | goto out; | |
b2648d51 AV |
514 | fsstack_copy_attr_times(dir, lower_dir); |
515 | fsstack_copy_inode_size(dir, lower_dir); | |
516 | set_nlink(dir, lower_dir->i_nlink); | |
237fead6 | 517 | out: |
b2648d51 | 518 | inode_unlock(lower_dir); |
2b0143b5 | 519 | if (d_really_is_negative(dentry)) |
237fead6 MH |
520 | d_drop(dentry); |
521 | return rc; | |
522 | } | |
523 | ||
524 | static int ecryptfs_rmdir(struct inode *dir, struct dentry *dentry) | |
525 | { | |
237fead6 | 526 | struct dentry *lower_dentry; |
b2648d51 | 527 | struct inode *lower_dir; |
45ec4aba | 528 | int rc; |
237fead6 | 529 | |
b2648d51 | 530 | rc = lock_parent(dentry, &lower_dentry, &lower_dir); |
bcf0d9d4 | 531 | dget(lower_dentry); // don't even try to make the lower negative |
b2648d51 AV |
532 | if (!rc) { |
533 | if (d_unhashed(lower_dentry)) | |
534 | rc = -EINVAL; | |
535 | else | |
abf08576 | 536 | rc = vfs_rmdir(&nop_mnt_idmap, lower_dir, lower_dentry); |
b2648d51 | 537 | } |
bcf0d9d4 | 538 | if (!rc) { |
2b0143b5 | 539 | clear_nlink(d_inode(dentry)); |
b2648d51 AV |
540 | fsstack_copy_attr_times(dir, lower_dir); |
541 | set_nlink(dir, lower_dir->i_nlink); | |
bcf0d9d4 AV |
542 | } |
543 | dput(lower_dentry); | |
b2648d51 | 544 | inode_unlock(lower_dir); |
237fead6 MH |
545 | if (!rc) |
546 | d_drop(dentry); | |
237fead6 MH |
547 | return rc; |
548 | } | |
549 | ||
550 | static int | |
549c7297 CB |
551 | ecryptfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
552 | struct dentry *dentry, umode_t mode, dev_t dev) | |
237fead6 MH |
553 | { |
554 | int rc; | |
555 | struct dentry *lower_dentry; | |
b2648d51 | 556 | struct inode *lower_dir; |
237fead6 | 557 | |
b2648d51 AV |
558 | rc = lock_parent(dentry, &lower_dentry, &lower_dir); |
559 | if (!rc) | |
abf08576 | 560 | rc = vfs_mknod(&nop_mnt_idmap, lower_dir, |
b2648d51 | 561 | lower_dentry, mode, dev); |
2b0143b5 | 562 | if (rc || d_really_is_negative(lower_dentry)) |
237fead6 | 563 | goto out; |
5ccf9203 | 564 | rc = ecryptfs_interpose(lower_dentry, dentry, dir->i_sb); |
237fead6 MH |
565 | if (rc) |
566 | goto out; | |
b2648d51 AV |
567 | fsstack_copy_attr_times(dir, lower_dir); |
568 | fsstack_copy_inode_size(dir, lower_dir); | |
237fead6 | 569 | out: |
b2648d51 | 570 | inode_unlock(lower_dir); |
2b0143b5 | 571 | if (d_really_is_negative(dentry)) |
237fead6 MH |
572 | d_drop(dentry); |
573 | return rc; | |
574 | } | |
575 | ||
576 | static int | |
549c7297 CB |
577 | ecryptfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
578 | struct dentry *old_dentry, struct inode *new_dir, | |
579 | struct dentry *new_dentry, unsigned int flags) | |
237fead6 MH |
580 | { |
581 | int rc; | |
582 | struct dentry *lower_old_dentry; | |
583 | struct dentry *lower_new_dentry; | |
584 | struct dentry *lower_old_dir_dentry; | |
585 | struct dentry *lower_new_dir_dentry; | |
bcf0d9d4 | 586 | struct dentry *trap; |
8335eafc | 587 | struct inode *target_inode; |
9fe61450 | 588 | struct renamedata rd = {}; |
237fead6 | 589 | |
1cd66c93 MS |
590 | if (flags) |
591 | return -EINVAL; | |
592 | ||
bcf0d9d4 AV |
593 | lower_old_dir_dentry = ecryptfs_dentry_to_lower(old_dentry->d_parent); |
594 | lower_new_dir_dentry = ecryptfs_dentry_to_lower(new_dentry->d_parent); | |
595 | ||
237fead6 MH |
596 | lower_old_dentry = ecryptfs_dentry_to_lower(old_dentry); |
597 | lower_new_dentry = ecryptfs_dentry_to_lower(new_dentry); | |
bcf0d9d4 | 598 | |
2b0143b5 | 599 | target_inode = d_inode(new_dentry); |
bcf0d9d4 | 600 | |
0d132f73 | 601 | trap = lock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
bcf0d9d4 | 602 | dget(lower_new_dentry); |
74dd7c97 AV |
603 | rc = -EINVAL; |
604 | if (lower_old_dentry->d_parent != lower_old_dir_dentry) | |
605 | goto out_lock; | |
606 | if (lower_new_dentry->d_parent != lower_new_dir_dentry) | |
607 | goto out_lock; | |
608 | if (d_unhashed(lower_old_dentry) || d_unhashed(lower_new_dentry)) | |
609 | goto out_lock; | |
0d132f73 | 610 | /* source should not be ancestor of target */ |
74dd7c97 | 611 | if (trap == lower_old_dentry) |
0d132f73 | 612 | goto out_lock; |
0d132f73 EZ |
613 | /* target should not be ancestor of source */ |
614 | if (trap == lower_new_dentry) { | |
615 | rc = -ENOTEMPTY; | |
616 | goto out_lock; | |
617 | } | |
9fe61450 | 618 | |
abf08576 | 619 | rd.old_mnt_idmap = &nop_mnt_idmap; |
6521f891 CB |
620 | rd.old_dir = d_inode(lower_old_dir_dentry); |
621 | rd.old_dentry = lower_old_dentry; | |
abf08576 | 622 | rd.new_mnt_idmap = &nop_mnt_idmap; |
6521f891 CB |
623 | rd.new_dir = d_inode(lower_new_dir_dentry); |
624 | rd.new_dentry = lower_new_dentry; | |
9fe61450 | 625 | rc = vfs_rename(&rd); |
237fead6 MH |
626 | if (rc) |
627 | goto out_lock; | |
8335eafc TH |
628 | if (target_inode) |
629 | fsstack_copy_attr_all(target_inode, | |
630 | ecryptfs_inode_to_lower(target_inode)); | |
2b0143b5 | 631 | fsstack_copy_attr_all(new_dir, d_inode(lower_new_dir_dentry)); |
237fead6 | 632 | if (new_dir != old_dir) |
2b0143b5 | 633 | fsstack_copy_attr_all(old_dir, d_inode(lower_old_dir_dentry)); |
237fead6 | 634 | out_lock: |
237fead6 | 635 | dput(lower_new_dentry); |
bcf0d9d4 | 636 | unlock_rename(lower_old_dir_dentry, lower_new_dir_dentry); |
237fead6 MH |
637 | return rc; |
638 | } | |
639 | ||
b22e8fed | 640 | static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz) |
237fead6 | 641 | { |
6c988f57 | 642 | DEFINE_DELAYED_CALL(done); |
3a60a168 | 643 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); |
6c988f57 | 644 | const char *link; |
b22e8fed | 645 | char *buf; |
addd65ad | 646 | int rc; |
237fead6 | 647 | |
6c988f57 MS |
648 | link = vfs_get_link(lower_dentry, &done); |
649 | if (IS_ERR(link)) | |
650 | return ERR_CAST(link); | |
651 | ||
b22e8fed | 652 | rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb, |
6c988f57 MS |
653 | link, strlen(link)); |
654 | do_delayed_call(&done); | |
655 | if (rc) | |
656 | return ERR_PTR(rc); | |
657 | ||
658 | return buf; | |
3a60a168 TH |
659 | } |
660 | ||
6b255391 | 661 | static const char *ecryptfs_get_link(struct dentry *dentry, |
fceef393 AV |
662 | struct inode *inode, |
663 | struct delayed_call *done) | |
3a60a168 | 664 | { |
b22e8fed | 665 | size_t len; |
6b255391 AV |
666 | char *buf; |
667 | ||
668 | if (!dentry) | |
669 | return ERR_PTR(-ECHILD); | |
670 | ||
671 | buf = ecryptfs_readlink_lower(dentry, &len); | |
b22e8fed | 672 | if (IS_ERR(buf)) |
680baacb | 673 | return buf; |
2b0143b5 DH |
674 | fsstack_copy_attr_atime(d_inode(dentry), |
675 | d_inode(ecryptfs_dentry_to_lower(dentry))); | |
408bd629 | 676 | buf[len] = '\0'; |
fceef393 AV |
677 | set_delayed_call(done, kfree_link, buf); |
678 | return buf; | |
237fead6 MH |
679 | } |
680 | ||
237fead6 MH |
681 | /** |
682 | * upper_size_to_lower_size | |
683 | * @crypt_stat: Crypt_stat associated with file | |
684 | * @upper_size: Size of the upper file | |
685 | * | |
cc11beff | 686 | * Calculate the required size of the lower file based on the |
237fead6 MH |
687 | * specified size of the upper file. This calculation is based on the |
688 | * number of headers in the underlying file and the extent size. | |
689 | * | |
690 | * Returns Calculated size of the lower file. | |
691 | */ | |
692 | static loff_t | |
693 | upper_size_to_lower_size(struct ecryptfs_crypt_stat *crypt_stat, | |
694 | loff_t upper_size) | |
695 | { | |
696 | loff_t lower_size; | |
697 | ||
157f1071 | 698 | lower_size = ecryptfs_lower_header_size(crypt_stat); |
237fead6 MH |
699 | if (upper_size != 0) { |
700 | loff_t num_extents; | |
701 | ||
702 | num_extents = upper_size >> crypt_stat->extent_shift; | |
703 | if (upper_size & ~crypt_stat->extent_mask) | |
704 | num_extents++; | |
705 | lower_size += (num_extents * crypt_stat->extent_size); | |
706 | } | |
707 | return lower_size; | |
708 | } | |
709 | ||
710 | /** | |
5f3ef64f | 711 | * truncate_upper |
237fead6 | 712 | * @dentry: The ecryptfs layer dentry |
5f3ef64f TH |
713 | * @ia: Address of the ecryptfs inode's attributes |
714 | * @lower_ia: Address of the lower inode's attributes | |
237fead6 MH |
715 | * |
716 | * Function to handle truncations modifying the size of the file. Note | |
717 | * that the file sizes are interpolated. When expanding, we are simply | |
5f3ef64f TH |
718 | * writing strings of 0's out. When truncating, we truncate the upper |
719 | * inode and update the lower_ia according to the page index | |
720 | * interpolations. If ATTR_SIZE is set in lower_ia->ia_valid upon return, | |
721 | * the caller must use lower_ia in a call to notify_change() to perform | |
722 | * the truncation of the lower inode. | |
237fead6 MH |
723 | * |
724 | * Returns zero on success; non-zero otherwise | |
725 | */ | |
5f3ef64f TH |
726 | static int truncate_upper(struct dentry *dentry, struct iattr *ia, |
727 | struct iattr *lower_ia) | |
237fead6 MH |
728 | { |
729 | int rc = 0; | |
2b0143b5 | 730 | struct inode *inode = d_inode(dentry); |
237fead6 MH |
731 | struct ecryptfs_crypt_stat *crypt_stat; |
732 | loff_t i_size = i_size_read(inode); | |
733 | loff_t lower_size_before_truncate; | |
734 | loff_t lower_size_after_truncate; | |
735 | ||
5f3ef64f TH |
736 | if (unlikely((ia->ia_size == i_size))) { |
737 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
332ab16f | 738 | return 0; |
5f3ef64f | 739 | } |
3b06b3eb | 740 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
741 | if (rc) |
742 | return rc; | |
2b0143b5 | 743 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
237fead6 | 744 | /* Switch on growing or shrinking file */ |
5f3ef64f | 745 | if (ia->ia_size > i_size) { |
2ed92554 MH |
746 | char zero[] = { 0x00 }; |
747 | ||
5f3ef64f | 748 | lower_ia->ia_valid &= ~ATTR_SIZE; |
2ed92554 MH |
749 | /* Write a single 0 at the last position of the file; |
750 | * this triggers code that will fill in 0's throughout | |
751 | * the intermediate portion of the previous end of the | |
752 | * file and the new and of the file */ | |
48c1e44a | 753 | rc = ecryptfs_write(inode, zero, |
5f3ef64f TH |
754 | (ia->ia_size - 1), 1); |
755 | } else { /* ia->ia_size < i_size_read(inode) */ | |
756 | /* We're chopping off all the pages down to the page | |
757 | * in which ia->ia_size is located. Fill in the end of | |
ea1754a0 KS |
758 | * that page from (ia->ia_size & ~PAGE_MASK) to |
759 | * PAGE_SIZE with zeros. */ | |
09cbfeaf KS |
760 | size_t num_zeros = (PAGE_SIZE |
761 | - (ia->ia_size & ~PAGE_MASK)); | |
2ed92554 | 762 | |
13a791b4 | 763 | if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)) { |
2c27c65e | 764 | truncate_setsize(inode, ia->ia_size); |
5f3ef64f TH |
765 | lower_ia->ia_size = ia->ia_size; |
766 | lower_ia->ia_valid |= ATTR_SIZE; | |
48c1e44a | 767 | goto out; |
13a791b4 | 768 | } |
2ed92554 MH |
769 | if (num_zeros) { |
770 | char *zeros_virt; | |
771 | ||
772 | zeros_virt = kzalloc(num_zeros, GFP_KERNEL); | |
773 | if (!zeros_virt) { | |
774 | rc = -ENOMEM; | |
48c1e44a | 775 | goto out; |
2ed92554 | 776 | } |
48c1e44a | 777 | rc = ecryptfs_write(inode, zeros_virt, |
5f3ef64f | 778 | ia->ia_size, num_zeros); |
2ed92554 | 779 | kfree(zeros_virt); |
5dda6992 | 780 | if (rc) { |
240e2df5 MH |
781 | printk(KERN_ERR "Error attempting to zero out " |
782 | "the remainder of the end page on " | |
783 | "reducing truncate; rc = [%d]\n", rc); | |
48c1e44a | 784 | goto out; |
240e2df5 MH |
785 | } |
786 | } | |
2c27c65e | 787 | truncate_setsize(inode, ia->ia_size); |
0216f7f7 | 788 | rc = ecryptfs_write_inode_size_to_metadata(inode); |
dd2a3b7a MH |
789 | if (rc) { |
790 | printk(KERN_ERR "Problem with " | |
791 | "ecryptfs_write_inode_size_to_metadata; " | |
792 | "rc = [%d]\n", rc); | |
48c1e44a | 793 | goto out; |
dd2a3b7a | 794 | } |
237fead6 MH |
795 | /* We are reducing the size of the ecryptfs file, and need to |
796 | * know if we need to reduce the size of the lower file. */ | |
797 | lower_size_before_truncate = | |
798 | upper_size_to_lower_size(crypt_stat, i_size); | |
799 | lower_size_after_truncate = | |
5f3ef64f TH |
800 | upper_size_to_lower_size(crypt_stat, ia->ia_size); |
801 | if (lower_size_after_truncate < lower_size_before_truncate) { | |
802 | lower_ia->ia_size = lower_size_after_truncate; | |
803 | lower_ia->ia_valid |= ATTR_SIZE; | |
804 | } else | |
805 | lower_ia->ia_valid &= ~ATTR_SIZE; | |
237fead6 | 806 | } |
237fead6 | 807 | out: |
332ab16f | 808 | ecryptfs_put_lower_file(inode); |
237fead6 MH |
809 | return rc; |
810 | } | |
811 | ||
a261a039 TH |
812 | static int ecryptfs_inode_newsize_ok(struct inode *inode, loff_t offset) |
813 | { | |
814 | struct ecryptfs_crypt_stat *crypt_stat; | |
815 | loff_t lower_oldsize, lower_newsize; | |
816 | ||
817 | crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat; | |
818 | lower_oldsize = upper_size_to_lower_size(crypt_stat, | |
819 | i_size_read(inode)); | |
820 | lower_newsize = upper_size_to_lower_size(crypt_stat, offset); | |
821 | if (lower_newsize > lower_oldsize) { | |
822 | /* | |
823 | * The eCryptfs inode and the new *lower* size are mixed here | |
824 | * because we may not have the lower i_mutex held and/or it may | |
825 | * not be appropriate to call inode_newsize_ok() with inodes | |
826 | * from other filesystems. | |
827 | */ | |
828 | return inode_newsize_ok(inode, lower_newsize); | |
829 | } | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
5f3ef64f TH |
834 | /** |
835 | * ecryptfs_truncate | |
836 | * @dentry: The ecryptfs layer dentry | |
837 | * @new_length: The length to expand the file to | |
838 | * | |
839 | * Simple function that handles the truncation of an eCryptfs inode and | |
840 | * its corresponding lower inode. | |
841 | * | |
842 | * Returns zero on success; non-zero otherwise | |
843 | */ | |
844 | int ecryptfs_truncate(struct dentry *dentry, loff_t new_length) | |
845 | { | |
846 | struct iattr ia = { .ia_valid = ATTR_SIZE, .ia_size = new_length }; | |
847 | struct iattr lower_ia = { .ia_valid = 0 }; | |
848 | int rc; | |
849 | ||
2b0143b5 | 850 | rc = ecryptfs_inode_newsize_ok(d_inode(dentry), new_length); |
a261a039 TH |
851 | if (rc) |
852 | return rc; | |
853 | ||
5f3ef64f TH |
854 | rc = truncate_upper(dentry, &ia, &lower_ia); |
855 | if (!rc && lower_ia.ia_valid & ATTR_SIZE) { | |
856 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
857 | ||
5955102c | 858 | inode_lock(d_inode(lower_dentry)); |
abf08576 | 859 | rc = notify_change(&nop_mnt_idmap, lower_dentry, |
2f221d6f | 860 | &lower_ia, NULL); |
5955102c | 861 | inode_unlock(d_inode(lower_dentry)); |
5f3ef64f TH |
862 | } |
863 | return rc; | |
864 | } | |
865 | ||
237fead6 | 866 | static int |
549c7297 CB |
867 | ecryptfs_permission(struct user_namespace *mnt_userns, struct inode *inode, |
868 | int mask) | |
237fead6 | 869 | { |
47291baa CB |
870 | return inode_permission(&init_user_ns, |
871 | ecryptfs_inode_to_lower(inode), mask); | |
237fead6 MH |
872 | } |
873 | ||
874 | /** | |
875 | * ecryptfs_setattr | |
d17074ac | 876 | * @mnt_userns: user namespace of the target mount |
237fead6 MH |
877 | * @dentry: dentry handle to the inode to modify |
878 | * @ia: Structure with flags of what to change and values | |
879 | * | |
880 | * Updates the metadata of an inode. If the update is to the size | |
881 | * i.e. truncation, then ecryptfs_truncate will handle the size modification | |
882 | * of both the ecryptfs inode and the lower inode. | |
883 | * | |
884 | * All other metadata changes will be passed right to the lower filesystem, | |
885 | * and we will just update our inode to look like the lower. | |
886 | */ | |
549c7297 CB |
887 | static int ecryptfs_setattr(struct user_namespace *mnt_userns, |
888 | struct dentry *dentry, struct iattr *ia) | |
237fead6 MH |
889 | { |
890 | int rc = 0; | |
891 | struct dentry *lower_dentry; | |
5f3ef64f | 892 | struct iattr lower_ia; |
237fead6 MH |
893 | struct inode *inode; |
894 | struct inode *lower_inode; | |
895 | struct ecryptfs_crypt_stat *crypt_stat; | |
896 | ||
2b0143b5 | 897 | crypt_stat = &ecryptfs_inode_to_private(d_inode(dentry))->crypt_stat; |
e81f3340 HX |
898 | if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED)) { |
899 | rc = ecryptfs_init_crypt_stat(crypt_stat); | |
900 | if (rc) | |
901 | return rc; | |
902 | } | |
2b0143b5 | 903 | inode = d_inode(dentry); |
237fead6 | 904 | lower_inode = ecryptfs_inode_to_lower(inode); |
e10f281b MH |
905 | lower_dentry = ecryptfs_dentry_to_lower(dentry); |
906 | mutex_lock(&crypt_stat->cs_mutex); | |
e36cb0b8 | 907 | if (d_is_dir(dentry)) |
e10f281b | 908 | crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED); |
e36cb0b8 | 909 | else if (d_is_reg(dentry) |
64ee4808 MH |
910 | && (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED) |
911 | || !(crypt_stat->flags & ECRYPTFS_KEY_VALID))) { | |
e10f281b | 912 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
e10f281b | 913 | |
e10f281b MH |
914 | mount_crypt_stat = &ecryptfs_superblock_to_private( |
915 | dentry->d_sb)->mount_crypt_stat; | |
3b06b3eb | 916 | rc = ecryptfs_get_lower_file(dentry, inode); |
332ab16f TH |
917 | if (rc) { |
918 | mutex_unlock(&crypt_stat->cs_mutex); | |
919 | goto out; | |
920 | } | |
d7cdc5fe | 921 | rc = ecryptfs_read_metadata(dentry); |
332ab16f | 922 | ecryptfs_put_lower_file(inode); |
5dda6992 | 923 | if (rc) { |
e10f281b MH |
924 | if (!(mount_crypt_stat->flags |
925 | & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) { | |
926 | rc = -EIO; | |
25bd8174 | 927 | printk(KERN_WARNING "Either the lower file " |
e10f281b | 928 | "is not in a valid eCryptfs format, " |
25bd8174 MH |
929 | "or the key could not be retrieved. " |
930 | "Plaintext passthrough mode is not " | |
e10f281b | 931 | "enabled; returning -EIO\n"); |
e10f281b | 932 | mutex_unlock(&crypt_stat->cs_mutex); |
e10f281b MH |
933 | goto out; |
934 | } | |
935 | rc = 0; | |
3aeb86ea TH |
936 | crypt_stat->flags &= ~(ECRYPTFS_I_SIZE_INITIALIZED |
937 | | ECRYPTFS_ENCRYPTED); | |
e10f281b | 938 | } |
e10f281b MH |
939 | } |
940 | mutex_unlock(&crypt_stat->cs_mutex); | |
a261a039 | 941 | |
2f221d6f | 942 | rc = setattr_prepare(&init_user_ns, dentry, ia); |
a261a039 TH |
943 | if (rc) |
944 | goto out; | |
945 | if (ia->ia_valid & ATTR_SIZE) { | |
946 | rc = ecryptfs_inode_newsize_ok(inode, ia->ia_size); | |
947 | if (rc) | |
948 | goto out; | |
949 | } | |
950 | ||
5f3ef64f TH |
951 | memcpy(&lower_ia, ia, sizeof(lower_ia)); |
952 | if (ia->ia_valid & ATTR_FILE) | |
953 | lower_ia.ia_file = ecryptfs_file_to_lower(ia->ia_file); | |
237fead6 | 954 | if (ia->ia_valid & ATTR_SIZE) { |
5f3ef64f | 955 | rc = truncate_upper(dentry, ia, &lower_ia); |
237fead6 MH |
956 | if (rc < 0) |
957 | goto out; | |
958 | } | |
1ac564ec JL |
959 | |
960 | /* | |
961 | * mode change is for clearing setuid/setgid bits. Allow lower fs | |
962 | * to interpret this in its own way. | |
963 | */ | |
5f3ef64f TH |
964 | if (lower_ia.ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
965 | lower_ia.ia_valid &= ~ATTR_MODE; | |
1ac564ec | 966 | |
5955102c | 967 | inode_lock(d_inode(lower_dentry)); |
abf08576 | 968 | rc = notify_change(&nop_mnt_idmap, lower_dentry, &lower_ia, NULL); |
5955102c | 969 | inode_unlock(d_inode(lower_dentry)); |
237fead6 | 970 | out: |
9afa2fb6 | 971 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
972 | return rc; |
973 | } | |
974 | ||
549c7297 CB |
975 | static int ecryptfs_getattr_link(struct user_namespace *mnt_userns, |
976 | const struct path *path, struct kstat *stat, | |
a528d35e | 977 | u32 request_mask, unsigned int flags) |
3a60a168 | 978 | { |
a528d35e | 979 | struct dentry *dentry = path->dentry; |
3a60a168 TH |
980 | struct ecryptfs_mount_crypt_stat *mount_crypt_stat; |
981 | int rc = 0; | |
982 | ||
983 | mount_crypt_stat = &ecryptfs_superblock_to_private( | |
984 | dentry->d_sb)->mount_crypt_stat; | |
0d56a451 | 985 | generic_fillattr(&init_user_ns, d_inode(dentry), stat); |
3a60a168 TH |
986 | if (mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES) { |
987 | char *target; | |
988 | size_t targetsiz; | |
989 | ||
b22e8fed AV |
990 | target = ecryptfs_readlink_lower(dentry, &targetsiz); |
991 | if (!IS_ERR(target)) { | |
3a60a168 TH |
992 | kfree(target); |
993 | stat->size = targetsiz; | |
b22e8fed AV |
994 | } else { |
995 | rc = PTR_ERR(target); | |
3a60a168 TH |
996 | } |
997 | } | |
998 | return rc; | |
999 | } | |
1000 | ||
549c7297 CB |
1001 | static int ecryptfs_getattr(struct user_namespace *mnt_userns, |
1002 | const struct path *path, struct kstat *stat, | |
a528d35e | 1003 | u32 request_mask, unsigned int flags) |
f8f484d1 | 1004 | { |
a528d35e | 1005 | struct dentry *dentry = path->dentry; |
f8f484d1 TH |
1006 | struct kstat lower_stat; |
1007 | int rc; | |
1008 | ||
a528d35e DH |
1009 | rc = vfs_getattr(ecryptfs_dentry_to_lower_path(dentry), &lower_stat, |
1010 | request_mask, flags); | |
f8f484d1 | 1011 | if (!rc) { |
2b0143b5 DH |
1012 | fsstack_copy_attr_all(d_inode(dentry), |
1013 | ecryptfs_inode_to_lower(d_inode(dentry))); | |
0d56a451 | 1014 | generic_fillattr(&init_user_ns, d_inode(dentry), stat); |
f8f484d1 TH |
1015 | stat->blocks = lower_stat.blocks; |
1016 | } | |
1017 | return rc; | |
1018 | } | |
1019 | ||
dd2a3b7a | 1020 | int |
3767e255 AV |
1021 | ecryptfs_setxattr(struct dentry *dentry, struct inode *inode, |
1022 | const char *name, const void *value, | |
237fead6 MH |
1023 | size_t size, int flags) |
1024 | { | |
5d6c3191 | 1025 | int rc; |
237fead6 | 1026 | struct dentry *lower_dentry; |
0b964446 | 1027 | struct inode *lower_inode; |
237fead6 MH |
1028 | |
1029 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
0b964446 MS |
1030 | lower_inode = d_inode(lower_dentry); |
1031 | if (!(lower_inode->i_opflags & IOP_XATTR)) { | |
cfce08c6 | 1032 | rc = -EOPNOTSUPP; |
237fead6 MH |
1033 | goto out; |
1034 | } | |
0b964446 | 1035 | inode_lock(lower_inode); |
7d6beb71 | 1036 | rc = __vfs_setxattr_locked(&init_user_ns, lower_dentry, name, value, size, flags, NULL); |
0b964446 | 1037 | inode_unlock(lower_inode); |
3767e255 | 1038 | if (!rc && inode) |
0b964446 | 1039 | fsstack_copy_attr_all(inode, lower_inode); |
237fead6 MH |
1040 | out: |
1041 | return rc; | |
1042 | } | |
1043 | ||
d7cdc5fe | 1044 | ssize_t |
ce23e640 AV |
1045 | ecryptfs_getxattr_lower(struct dentry *lower_dentry, struct inode *lower_inode, |
1046 | const char *name, void *value, size_t size) | |
d7cdc5fe | 1047 | { |
5d6c3191 | 1048 | int rc; |
d7cdc5fe | 1049 | |
5d6c3191 | 1050 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1051 | rc = -EOPNOTSUPP; |
d7cdc5fe MH |
1052 | goto out; |
1053 | } | |
ce23e640 | 1054 | inode_lock(lower_inode); |
5d6c3191 | 1055 | rc = __vfs_getxattr(lower_dentry, lower_inode, name, value, size); |
ce23e640 | 1056 | inode_unlock(lower_inode); |
d7cdc5fe MH |
1057 | out: |
1058 | return rc; | |
1059 | } | |
1060 | ||
7896b631 | 1061 | static ssize_t |
ce23e640 AV |
1062 | ecryptfs_getxattr(struct dentry *dentry, struct inode *inode, |
1063 | const char *name, void *value, size_t size) | |
237fead6 | 1064 | { |
ce23e640 AV |
1065 | return ecryptfs_getxattr_lower(ecryptfs_dentry_to_lower(dentry), |
1066 | ecryptfs_inode_to_lower(inode), | |
1067 | name, value, size); | |
237fead6 MH |
1068 | } |
1069 | ||
1070 | static ssize_t | |
1071 | ecryptfs_listxattr(struct dentry *dentry, char *list, size_t size) | |
1072 | { | |
1073 | int rc = 0; | |
1074 | struct dentry *lower_dentry; | |
1075 | ||
1076 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
2b0143b5 | 1077 | if (!d_inode(lower_dentry)->i_op->listxattr) { |
cfce08c6 | 1078 | rc = -EOPNOTSUPP; |
237fead6 MH |
1079 | goto out; |
1080 | } | |
5955102c | 1081 | inode_lock(d_inode(lower_dentry)); |
2b0143b5 | 1082 | rc = d_inode(lower_dentry)->i_op->listxattr(lower_dentry, list, size); |
5955102c | 1083 | inode_unlock(d_inode(lower_dentry)); |
237fead6 MH |
1084 | out: |
1085 | return rc; | |
1086 | } | |
1087 | ||
4b899da5 AG |
1088 | static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode, |
1089 | const char *name) | |
237fead6 | 1090 | { |
5d6c3191 | 1091 | int rc; |
237fead6 | 1092 | struct dentry *lower_dentry; |
4b899da5 | 1093 | struct inode *lower_inode; |
237fead6 MH |
1094 | |
1095 | lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
4b899da5 | 1096 | lower_inode = ecryptfs_inode_to_lower(inode); |
5d6c3191 | 1097 | if (!(lower_inode->i_opflags & IOP_XATTR)) { |
cfce08c6 | 1098 | rc = -EOPNOTSUPP; |
237fead6 MH |
1099 | goto out; |
1100 | } | |
4b899da5 | 1101 | inode_lock(lower_inode); |
c7c7a1a1 | 1102 | rc = __vfs_removexattr(&init_user_ns, lower_dentry, name); |
4b899da5 | 1103 | inode_unlock(lower_inode); |
237fead6 MH |
1104 | out: |
1105 | return rc; | |
1106 | } | |
1107 | ||
97e2dee9 MS |
1108 | static int ecryptfs_fileattr_get(struct dentry *dentry, struct fileattr *fa) |
1109 | { | |
1110 | return vfs_fileattr_get(ecryptfs_dentry_to_lower(dentry), fa); | |
1111 | } | |
1112 | ||
1113 | static int ecryptfs_fileattr_set(struct user_namespace *mnt_userns, | |
1114 | struct dentry *dentry, struct fileattr *fa) | |
1115 | { | |
1116 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1117 | int rc; | |
1118 | ||
1119 | rc = vfs_fileattr_set(&init_user_ns, lower_dentry, fa); | |
1120 | fsstack_copy_attr_all(d_inode(dentry), d_inode(lower_dentry)); | |
1121 | ||
1122 | return rc; | |
1123 | } | |
1124 | ||
af84016f CB |
1125 | static struct posix_acl *ecryptfs_get_acl(struct user_namespace *mnt_userns, |
1126 | struct dentry *dentry, int type) | |
1127 | { | |
1128 | return vfs_get_acl(mnt_userns, ecryptfs_dentry_to_lower(dentry), | |
1129 | posix_acl_xattr_name(type)); | |
1130 | } | |
1131 | ||
86c261b9 CB |
1132 | static int ecryptfs_set_acl(struct user_namespace *mnt_userns, |
1133 | struct dentry *dentry, struct posix_acl *acl, | |
1134 | int type) | |
1135 | { | |
1136 | int rc; | |
1137 | struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry); | |
1138 | struct inode *lower_inode = d_inode(lower_dentry); | |
1139 | ||
1140 | rc = vfs_set_acl(&init_user_ns, lower_dentry, | |
1141 | posix_acl_xattr_name(type), acl); | |
1142 | if (!rc) | |
1143 | fsstack_copy_attr_all(d_inode(dentry), lower_inode); | |
1144 | return rc; | |
1145 | } | |
1146 | ||
754661f1 | 1147 | const struct inode_operations ecryptfs_symlink_iops = { |
6b255391 | 1148 | .get_link = ecryptfs_get_link, |
237fead6 MH |
1149 | .permission = ecryptfs_permission, |
1150 | .setattr = ecryptfs_setattr, | |
3a60a168 | 1151 | .getattr = ecryptfs_getattr_link, |
237fead6 | 1152 | .listxattr = ecryptfs_listxattr, |
237fead6 MH |
1153 | }; |
1154 | ||
754661f1 | 1155 | const struct inode_operations ecryptfs_dir_iops = { |
237fead6 MH |
1156 | .create = ecryptfs_create, |
1157 | .lookup = ecryptfs_lookup, | |
1158 | .link = ecryptfs_link, | |
1159 | .unlink = ecryptfs_unlink, | |
1160 | .symlink = ecryptfs_symlink, | |
1161 | .mkdir = ecryptfs_mkdir, | |
1162 | .rmdir = ecryptfs_rmdir, | |
1163 | .mknod = ecryptfs_mknod, | |
1164 | .rename = ecryptfs_rename, | |
1165 | .permission = ecryptfs_permission, | |
1166 | .setattr = ecryptfs_setattr, | |
237fead6 | 1167 | .listxattr = ecryptfs_listxattr, |
97e2dee9 MS |
1168 | .fileattr_get = ecryptfs_fileattr_get, |
1169 | .fileattr_set = ecryptfs_fileattr_set, | |
af84016f | 1170 | .get_acl = ecryptfs_get_acl, |
86c261b9 | 1171 | .set_acl = ecryptfs_set_acl, |
237fead6 MH |
1172 | }; |
1173 | ||
754661f1 | 1174 | const struct inode_operations ecryptfs_main_iops = { |
237fead6 MH |
1175 | .permission = ecryptfs_permission, |
1176 | .setattr = ecryptfs_setattr, | |
f8f484d1 | 1177 | .getattr = ecryptfs_getattr, |
237fead6 | 1178 | .listxattr = ecryptfs_listxattr, |
97e2dee9 MS |
1179 | .fileattr_get = ecryptfs_fileattr_get, |
1180 | .fileattr_set = ecryptfs_fileattr_set, | |
af84016f | 1181 | .get_acl = ecryptfs_get_acl, |
86c261b9 | 1182 | .set_acl = ecryptfs_set_acl, |
4b899da5 AG |
1183 | }; |
1184 | ||
1185 | static int ecryptfs_xattr_get(const struct xattr_handler *handler, | |
1186 | struct dentry *dentry, struct inode *inode, | |
1187 | const char *name, void *buffer, size_t size) | |
1188 | { | |
1189 | return ecryptfs_getxattr(dentry, inode, name, buffer, size); | |
1190 | } | |
1191 | ||
1192 | static int ecryptfs_xattr_set(const struct xattr_handler *handler, | |
e65ce2a5 | 1193 | struct user_namespace *mnt_userns, |
4b899da5 AG |
1194 | struct dentry *dentry, struct inode *inode, |
1195 | const char *name, const void *value, size_t size, | |
1196 | int flags) | |
1197 | { | |
1198 | if (value) | |
1199 | return ecryptfs_setxattr(dentry, inode, name, value, size, flags); | |
1200 | else { | |
1201 | BUG_ON(flags != XATTR_REPLACE); | |
1202 | return ecryptfs_removexattr(dentry, inode, name); | |
1203 | } | |
1204 | } | |
1205 | ||
c036061b | 1206 | static const struct xattr_handler ecryptfs_xattr_handler = { |
4b899da5 AG |
1207 | .prefix = "", /* match anything */ |
1208 | .get = ecryptfs_xattr_get, | |
1209 | .set = ecryptfs_xattr_set, | |
1210 | }; | |
1211 | ||
1212 | const struct xattr_handler *ecryptfs_xattr_handlers[] = { | |
04af28fa CB |
1213 | #ifdef CONFIG_FS_POSIX_ACL |
1214 | &posix_acl_access_xattr_handler, | |
1215 | &posix_acl_default_xattr_handler, | |
1216 | #endif | |
4b899da5 AG |
1217 | &ecryptfs_xattr_handler, |
1218 | NULL | |
237fead6 | 1219 | }; |