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