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Commit | Line | Data |
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0b81d077 JK |
1 | /* |
2 | * This contains encryption functions for per-file encryption. | |
3 | * | |
4 | * Copyright (C) 2015, Google, Inc. | |
5 | * Copyright (C) 2015, Motorola Mobility | |
6 | * | |
7 | * Written by Michael Halcrow, 2014. | |
8 | * | |
9 | * Filename encryption additions | |
10 | * Uday Savagaonkar, 2014 | |
11 | * Encryption policy handling additions | |
12 | * Ildar Muslukhov, 2014 | |
13 | * Add fscrypt_pullback_bio_page() | |
14 | * Jaegeuk Kim, 2015. | |
15 | * | |
16 | * This has not yet undergone a rigorous security audit. | |
17 | * | |
18 | * The usage of AES-XTS should conform to recommendations in NIST | |
19 | * Special Publication 800-38E and IEEE P1619/D16. | |
20 | */ | |
21 | ||
0b81d077 JK |
22 | #include <linux/pagemap.h> |
23 | #include <linux/mempool.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/scatterlist.h> | |
26 | #include <linux/ratelimit.h> | |
0b81d077 | 27 | #include <linux/dcache.h> |
03a8bb0e | 28 | #include <linux/namei.h> |
b7e7cf7a | 29 | #include <crypto/aes.h> |
cc4e0df0 | 30 | #include "fscrypt_private.h" |
0b81d077 JK |
31 | |
32 | static unsigned int num_prealloc_crypto_pages = 32; | |
33 | static unsigned int num_prealloc_crypto_ctxs = 128; | |
34 | ||
35 | module_param(num_prealloc_crypto_pages, uint, 0444); | |
36 | MODULE_PARM_DESC(num_prealloc_crypto_pages, | |
37 | "Number of crypto pages to preallocate"); | |
38 | module_param(num_prealloc_crypto_ctxs, uint, 0444); | |
39 | MODULE_PARM_DESC(num_prealloc_crypto_ctxs, | |
40 | "Number of crypto contexts to preallocate"); | |
41 | ||
42 | static mempool_t *fscrypt_bounce_page_pool = NULL; | |
43 | ||
44 | static LIST_HEAD(fscrypt_free_ctxs); | |
45 | static DEFINE_SPINLOCK(fscrypt_ctx_lock); | |
46 | ||
58ae7468 | 47 | struct workqueue_struct *fscrypt_read_workqueue; |
0b81d077 JK |
48 | static DEFINE_MUTEX(fscrypt_init_mutex); |
49 | ||
50 | static struct kmem_cache *fscrypt_ctx_cachep; | |
51 | struct kmem_cache *fscrypt_info_cachep; | |
52 | ||
53 | /** | |
54 | * fscrypt_release_ctx() - Releases an encryption context | |
55 | * @ctx: The encryption context to release. | |
56 | * | |
57 | * If the encryption context was allocated from the pre-allocated pool, returns | |
58 | * it to that pool. Else, frees it. | |
59 | * | |
60 | * If there's a bounce page in the context, this frees that. | |
61 | */ | |
62 | void fscrypt_release_ctx(struct fscrypt_ctx *ctx) | |
63 | { | |
64 | unsigned long flags; | |
65 | ||
6a34e4d2 | 66 | if (ctx->flags & FS_CTX_HAS_BOUNCE_BUFFER_FL && ctx->w.bounce_page) { |
0b81d077 JK |
67 | mempool_free(ctx->w.bounce_page, fscrypt_bounce_page_pool); |
68 | ctx->w.bounce_page = NULL; | |
69 | } | |
70 | ctx->w.control_page = NULL; | |
71 | if (ctx->flags & FS_CTX_REQUIRES_FREE_ENCRYPT_FL) { | |
72 | kmem_cache_free(fscrypt_ctx_cachep, ctx); | |
73 | } else { | |
74 | spin_lock_irqsave(&fscrypt_ctx_lock, flags); | |
75 | list_add(&ctx->free_list, &fscrypt_free_ctxs); | |
76 | spin_unlock_irqrestore(&fscrypt_ctx_lock, flags); | |
77 | } | |
78 | } | |
79 | EXPORT_SYMBOL(fscrypt_release_ctx); | |
80 | ||
81 | /** | |
82 | * fscrypt_get_ctx() - Gets an encryption context | |
83 | * @inode: The inode for which we are doing the crypto | |
b32e4482 | 84 | * @gfp_flags: The gfp flag for memory allocation |
0b81d077 JK |
85 | * |
86 | * Allocates and initializes an encryption context. | |
87 | * | |
88 | * Return: An allocated and initialized encryption context on success; error | |
89 | * value or NULL otherwise. | |
90 | */ | |
0b93e1b9 | 91 | struct fscrypt_ctx *fscrypt_get_ctx(const struct inode *inode, gfp_t gfp_flags) |
0b81d077 JK |
92 | { |
93 | struct fscrypt_ctx *ctx = NULL; | |
94 | struct fscrypt_info *ci = inode->i_crypt_info; | |
95 | unsigned long flags; | |
96 | ||
97 | if (ci == NULL) | |
98 | return ERR_PTR(-ENOKEY); | |
99 | ||
100 | /* | |
101 | * We first try getting the ctx from a free list because in | |
102 | * the common case the ctx will have an allocated and | |
103 | * initialized crypto tfm, so it's probably a worthwhile | |
104 | * optimization. For the bounce page, we first try getting it | |
105 | * from the kernel allocator because that's just about as fast | |
106 | * as getting it from a list and because a cache of free pages | |
107 | * should generally be a "last resort" option for a filesystem | |
108 | * to be able to do its job. | |
109 | */ | |
110 | spin_lock_irqsave(&fscrypt_ctx_lock, flags); | |
111 | ctx = list_first_entry_or_null(&fscrypt_free_ctxs, | |
112 | struct fscrypt_ctx, free_list); | |
113 | if (ctx) | |
114 | list_del(&ctx->free_list); | |
115 | spin_unlock_irqrestore(&fscrypt_ctx_lock, flags); | |
116 | if (!ctx) { | |
b32e4482 | 117 | ctx = kmem_cache_zalloc(fscrypt_ctx_cachep, gfp_flags); |
0b81d077 JK |
118 | if (!ctx) |
119 | return ERR_PTR(-ENOMEM); | |
120 | ctx->flags |= FS_CTX_REQUIRES_FREE_ENCRYPT_FL; | |
121 | } else { | |
122 | ctx->flags &= ~FS_CTX_REQUIRES_FREE_ENCRYPT_FL; | |
123 | } | |
6a34e4d2 | 124 | ctx->flags &= ~FS_CTX_HAS_BOUNCE_BUFFER_FL; |
0b81d077 JK |
125 | return ctx; |
126 | } | |
127 | EXPORT_SYMBOL(fscrypt_get_ctx); | |
128 | ||
58ae7468 RW |
129 | int fscrypt_do_page_crypto(const struct inode *inode, fscrypt_direction_t rw, |
130 | u64 lblk_num, struct page *src_page, | |
131 | struct page *dest_page, unsigned int len, | |
132 | unsigned int offs, gfp_t gfp_flags) | |
0b81d077 | 133 | { |
fb445437 EB |
134 | struct { |
135 | __le64 index; | |
b7e7cf7a DW |
136 | u8 padding[FS_IV_SIZE - sizeof(__le64)]; |
137 | } iv; | |
d407574e | 138 | struct skcipher_request *req = NULL; |
d0082e1a | 139 | DECLARE_CRYPTO_WAIT(wait); |
0b81d077 JK |
140 | struct scatterlist dst, src; |
141 | struct fscrypt_info *ci = inode->i_crypt_info; | |
d407574e | 142 | struct crypto_skcipher *tfm = ci->ci_ctfm; |
0b81d077 JK |
143 | int res = 0; |
144 | ||
a15d15ee EB |
145 | if (WARN_ON_ONCE(len <= 0)) |
146 | return -EINVAL; | |
147 | if (WARN_ON_ONCE(len % FS_CRYPTO_BLOCK_SIZE != 0)) | |
148 | return -EINVAL; | |
1400451f | 149 | |
b7e7cf7a DW |
150 | BUILD_BUG_ON(sizeof(iv) != FS_IV_SIZE); |
151 | BUILD_BUG_ON(AES_BLOCK_SIZE != FS_IV_SIZE); | |
152 | iv.index = cpu_to_le64(lblk_num); | |
153 | memset(iv.padding, 0, sizeof(iv.padding)); | |
154 | ||
155 | if (ci->ci_essiv_tfm != NULL) { | |
156 | crypto_cipher_encrypt_one(ci->ci_essiv_tfm, (u8 *)&iv, | |
157 | (u8 *)&iv); | |
158 | } | |
159 | ||
b32e4482 | 160 | req = skcipher_request_alloc(tfm, gfp_flags); |
0b81d077 JK |
161 | if (!req) { |
162 | printk_ratelimited(KERN_ERR | |
163 | "%s: crypto_request_alloc() failed\n", | |
164 | __func__); | |
165 | return -ENOMEM; | |
166 | } | |
167 | ||
d407574e | 168 | skcipher_request_set_callback( |
0b81d077 | 169 | req, CRYPTO_TFM_REQ_MAY_BACKLOG | CRYPTO_TFM_REQ_MAY_SLEEP, |
d0082e1a | 170 | crypto_req_done, &wait); |
0b81d077 | 171 | |
0b81d077 | 172 | sg_init_table(&dst, 1); |
1400451f | 173 | sg_set_page(&dst, dest_page, len, offs); |
0b81d077 | 174 | sg_init_table(&src, 1); |
1400451f | 175 | sg_set_page(&src, src_page, len, offs); |
b7e7cf7a | 176 | skcipher_request_set_crypt(req, &src, &dst, len, &iv); |
0b81d077 | 177 | if (rw == FS_DECRYPT) |
d0082e1a | 178 | res = crypto_wait_req(crypto_skcipher_decrypt(req), &wait); |
0b81d077 | 179 | else |
d0082e1a | 180 | res = crypto_wait_req(crypto_skcipher_encrypt(req), &wait); |
d407574e | 181 | skcipher_request_free(req); |
0b81d077 JK |
182 | if (res) { |
183 | printk_ratelimited(KERN_ERR | |
d407574e | 184 | "%s: crypto_skcipher_encrypt() returned %d\n", |
0b81d077 JK |
185 | __func__, res); |
186 | return res; | |
187 | } | |
188 | return 0; | |
189 | } | |
190 | ||
58ae7468 RW |
191 | struct page *fscrypt_alloc_bounce_page(struct fscrypt_ctx *ctx, |
192 | gfp_t gfp_flags) | |
0b81d077 | 193 | { |
b32e4482 | 194 | ctx->w.bounce_page = mempool_alloc(fscrypt_bounce_page_pool, gfp_flags); |
0b81d077 JK |
195 | if (ctx->w.bounce_page == NULL) |
196 | return ERR_PTR(-ENOMEM); | |
6a34e4d2 | 197 | ctx->flags |= FS_CTX_HAS_BOUNCE_BUFFER_FL; |
0b81d077 JK |
198 | return ctx->w.bounce_page; |
199 | } | |
200 | ||
201 | /** | |
202 | * fscypt_encrypt_page() - Encrypts a page | |
1400451f DG |
203 | * @inode: The inode for which the encryption should take place |
204 | * @page: The page to encrypt. Must be locked for bounce-page | |
205 | * encryption. | |
206 | * @len: Length of data to encrypt in @page and encrypted | |
207 | * data in returned page. | |
208 | * @offs: Offset of data within @page and returned | |
209 | * page holding encrypted data. | |
210 | * @lblk_num: Logical block number. This must be unique for multiple | |
211 | * calls with same inode, except when overwriting | |
212 | * previously written data. | |
213 | * @gfp_flags: The gfp flag for memory allocation | |
0b81d077 | 214 | * |
1400451f DG |
215 | * Encrypts @page using the ctx encryption context. Performs encryption |
216 | * either in-place or into a newly allocated bounce page. | |
217 | * Called on the page write path. | |
0b81d077 | 218 | * |
1400451f DG |
219 | * Bounce page allocation is the default. |
220 | * In this case, the contents of @page are encrypted and stored in an | |
221 | * allocated bounce page. @page has to be locked and the caller must call | |
0b81d077 JK |
222 | * fscrypt_restore_control_page() on the returned ciphertext page to |
223 | * release the bounce buffer and the encryption context. | |
224 | * | |
bd7b8290 | 225 | * In-place encryption is used by setting the FS_CFLG_OWN_PAGES flag in |
1400451f DG |
226 | * fscrypt_operations. Here, the input-page is returned with its content |
227 | * encrypted. | |
228 | * | |
229 | * Return: A page with the encrypted content on success. Else, an | |
0b81d077 JK |
230 | * error value or NULL. |
231 | */ | |
0b93e1b9 | 232 | struct page *fscrypt_encrypt_page(const struct inode *inode, |
1400451f DG |
233 | struct page *page, |
234 | unsigned int len, | |
235 | unsigned int offs, | |
236 | u64 lblk_num, gfp_t gfp_flags) | |
7821d4dd | 237 | |
0b81d077 JK |
238 | { |
239 | struct fscrypt_ctx *ctx; | |
1400451f | 240 | struct page *ciphertext_page = page; |
0b81d077 JK |
241 | int err; |
242 | ||
bd7b8290 | 243 | if (inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES) { |
9e532772 | 244 | /* with inplace-encryption we just encrypt the page */ |
58ae7468 RW |
245 | err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num, page, |
246 | ciphertext_page, len, offs, | |
247 | gfp_flags); | |
9e532772 DG |
248 | if (err) |
249 | return ERR_PTR(err); | |
250 | ||
251 | return ciphertext_page; | |
252 | } | |
253 | ||
a15d15ee EB |
254 | if (WARN_ON_ONCE(!PageLocked(page))) |
255 | return ERR_PTR(-EINVAL); | |
bd7b8290 | 256 | |
b32e4482 | 257 | ctx = fscrypt_get_ctx(inode, gfp_flags); |
0b81d077 JK |
258 | if (IS_ERR(ctx)) |
259 | return (struct page *)ctx; | |
260 | ||
9e532772 | 261 | /* The encryption operation will require a bounce page. */ |
58ae7468 | 262 | ciphertext_page = fscrypt_alloc_bounce_page(ctx, gfp_flags); |
9e532772 DG |
263 | if (IS_ERR(ciphertext_page)) |
264 | goto errout; | |
0b81d077 | 265 | |
1400451f | 266 | ctx->w.control_page = page; |
58ae7468 RW |
267 | err = fscrypt_do_page_crypto(inode, FS_ENCRYPT, lblk_num, |
268 | page, ciphertext_page, len, offs, | |
269 | gfp_flags); | |
0b81d077 JK |
270 | if (err) { |
271 | ciphertext_page = ERR_PTR(err); | |
272 | goto errout; | |
273 | } | |
9e532772 DG |
274 | SetPagePrivate(ciphertext_page); |
275 | set_page_private(ciphertext_page, (unsigned long)ctx); | |
276 | lock_page(ciphertext_page); | |
0b81d077 JK |
277 | return ciphertext_page; |
278 | ||
279 | errout: | |
280 | fscrypt_release_ctx(ctx); | |
281 | return ciphertext_page; | |
282 | } | |
283 | EXPORT_SYMBOL(fscrypt_encrypt_page); | |
284 | ||
285 | /** | |
7821d4dd | 286 | * fscrypt_decrypt_page() - Decrypts a page in-place |
1400451f DG |
287 | * @inode: The corresponding inode for the page to decrypt. |
288 | * @page: The page to decrypt. Must be locked in case | |
bd7b8290 | 289 | * it is a writeback page (FS_CFLG_OWN_PAGES unset). |
1400451f DG |
290 | * @len: Number of bytes in @page to be decrypted. |
291 | * @offs: Start of data in @page. | |
292 | * @lblk_num: Logical block number. | |
0b81d077 JK |
293 | * |
294 | * Decrypts page in-place using the ctx encryption context. | |
295 | * | |
296 | * Called from the read completion callback. | |
297 | * | |
298 | * Return: Zero on success, non-zero otherwise. | |
299 | */ | |
0b93e1b9 | 300 | int fscrypt_decrypt_page(const struct inode *inode, struct page *page, |
1400451f | 301 | unsigned int len, unsigned int offs, u64 lblk_num) |
0b81d077 | 302 | { |
a15d15ee EB |
303 | if (WARN_ON_ONCE(!PageLocked(page) && |
304 | !(inode->i_sb->s_cop->flags & FS_CFLG_OWN_PAGES))) | |
305 | return -EINVAL; | |
bd7b8290 | 306 | |
58ae7468 RW |
307 | return fscrypt_do_page_crypto(inode, FS_DECRYPT, lblk_num, page, page, |
308 | len, offs, GFP_NOFS); | |
0b81d077 JK |
309 | } |
310 | EXPORT_SYMBOL(fscrypt_decrypt_page); | |
311 | ||
0b81d077 JK |
312 | /* |
313 | * Validate dentries for encrypted directories to make sure we aren't | |
314 | * potentially caching stale data after a key has been added or | |
315 | * removed. | |
316 | */ | |
317 | static int fscrypt_d_revalidate(struct dentry *dentry, unsigned int flags) | |
318 | { | |
d7d75352 | 319 | struct dentry *dir; |
0b81d077 JK |
320 | int dir_has_key, cached_with_key; |
321 | ||
03a8bb0e JK |
322 | if (flags & LOOKUP_RCU) |
323 | return -ECHILD; | |
324 | ||
d7d75352 | 325 | dir = dget_parent(dentry); |
e0428a26 | 326 | if (!IS_ENCRYPTED(d_inode(dir))) { |
d7d75352 | 327 | dput(dir); |
0b81d077 | 328 | return 0; |
d7d75352 | 329 | } |
0b81d077 | 330 | |
0b81d077 JK |
331 | /* this should eventually be an flag in d_flags */ |
332 | spin_lock(&dentry->d_lock); | |
333 | cached_with_key = dentry->d_flags & DCACHE_ENCRYPTED_WITH_KEY; | |
334 | spin_unlock(&dentry->d_lock); | |
1b53cf98 | 335 | dir_has_key = (d_inode(dir)->i_crypt_info != NULL); |
d7d75352 | 336 | dput(dir); |
0b81d077 JK |
337 | |
338 | /* | |
339 | * If the dentry was cached without the key, and it is a | |
340 | * negative dentry, it might be a valid name. We can't check | |
341 | * if the key has since been made available due to locking | |
342 | * reasons, so we fail the validation so ext4_lookup() can do | |
343 | * this check. | |
344 | * | |
345 | * We also fail the validation if the dentry was created with | |
346 | * the key present, but we no longer have the key, or vice versa. | |
347 | */ | |
348 | if ((!cached_with_key && d_is_negative(dentry)) || | |
349 | (!cached_with_key && dir_has_key) || | |
350 | (cached_with_key && !dir_has_key)) | |
351 | return 0; | |
352 | return 1; | |
353 | } | |
354 | ||
355 | const struct dentry_operations fscrypt_d_ops = { | |
356 | .d_revalidate = fscrypt_d_revalidate, | |
357 | }; | |
358 | EXPORT_SYMBOL(fscrypt_d_ops); | |
359 | ||
0b81d077 JK |
360 | void fscrypt_restore_control_page(struct page *page) |
361 | { | |
362 | struct fscrypt_ctx *ctx; | |
363 | ||
364 | ctx = (struct fscrypt_ctx *)page_private(page); | |
365 | set_page_private(page, (unsigned long)NULL); | |
366 | ClearPagePrivate(page); | |
367 | unlock_page(page); | |
368 | fscrypt_release_ctx(ctx); | |
369 | } | |
370 | EXPORT_SYMBOL(fscrypt_restore_control_page); | |
371 | ||
372 | static void fscrypt_destroy(void) | |
373 | { | |
374 | struct fscrypt_ctx *pos, *n; | |
375 | ||
376 | list_for_each_entry_safe(pos, n, &fscrypt_free_ctxs, free_list) | |
377 | kmem_cache_free(fscrypt_ctx_cachep, pos); | |
378 | INIT_LIST_HEAD(&fscrypt_free_ctxs); | |
379 | mempool_destroy(fscrypt_bounce_page_pool); | |
380 | fscrypt_bounce_page_pool = NULL; | |
381 | } | |
382 | ||
383 | /** | |
384 | * fscrypt_initialize() - allocate major buffers for fs encryption. | |
f32d7ac2 | 385 | * @cop_flags: fscrypt operations flags |
0b81d077 JK |
386 | * |
387 | * We only call this when we start accessing encrypted files, since it | |
388 | * results in memory getting allocated that wouldn't otherwise be used. | |
389 | * | |
390 | * Return: Zero on success, non-zero otherwise. | |
391 | */ | |
f32d7ac2 | 392 | int fscrypt_initialize(unsigned int cop_flags) |
0b81d077 JK |
393 | { |
394 | int i, res = -ENOMEM; | |
395 | ||
a0b3bc85 EB |
396 | /* No need to allocate a bounce page pool if this FS won't use it. */ |
397 | if (cop_flags & FS_CFLG_OWN_PAGES) | |
0b81d077 JK |
398 | return 0; |
399 | ||
400 | mutex_lock(&fscrypt_init_mutex); | |
401 | if (fscrypt_bounce_page_pool) | |
402 | goto already_initialized; | |
403 | ||
404 | for (i = 0; i < num_prealloc_crypto_ctxs; i++) { | |
405 | struct fscrypt_ctx *ctx; | |
406 | ||
407 | ctx = kmem_cache_zalloc(fscrypt_ctx_cachep, GFP_NOFS); | |
408 | if (!ctx) | |
409 | goto fail; | |
410 | list_add(&ctx->free_list, &fscrypt_free_ctxs); | |
411 | } | |
412 | ||
413 | fscrypt_bounce_page_pool = | |
414 | mempool_create_page_pool(num_prealloc_crypto_pages, 0); | |
415 | if (!fscrypt_bounce_page_pool) | |
416 | goto fail; | |
417 | ||
418 | already_initialized: | |
419 | mutex_unlock(&fscrypt_init_mutex); | |
420 | return 0; | |
421 | fail: | |
422 | fscrypt_destroy(); | |
423 | mutex_unlock(&fscrypt_init_mutex); | |
424 | return res; | |
425 | } | |
0b81d077 JK |
426 | |
427 | /** | |
428 | * fscrypt_init() - Set up for fs encryption. | |
429 | */ | |
430 | static int __init fscrypt_init(void) | |
431 | { | |
6096431b EB |
432 | /* |
433 | * Use an unbound workqueue to allow bios to be decrypted in parallel | |
434 | * even when they happen to complete on the same CPU. This sacrifices | |
435 | * locality, but it's worthwhile since decryption is CPU-intensive. | |
436 | * | |
437 | * Also use a high-priority workqueue to prioritize decryption work, | |
438 | * which blocks reads from completing, over regular application tasks. | |
439 | */ | |
0b81d077 | 440 | fscrypt_read_workqueue = alloc_workqueue("fscrypt_read_queue", |
6096431b EB |
441 | WQ_UNBOUND | WQ_HIGHPRI, |
442 | num_online_cpus()); | |
0b81d077 JK |
443 | if (!fscrypt_read_workqueue) |
444 | goto fail; | |
445 | ||
446 | fscrypt_ctx_cachep = KMEM_CACHE(fscrypt_ctx, SLAB_RECLAIM_ACCOUNT); | |
447 | if (!fscrypt_ctx_cachep) | |
448 | goto fail_free_queue; | |
449 | ||
450 | fscrypt_info_cachep = KMEM_CACHE(fscrypt_info, SLAB_RECLAIM_ACCOUNT); | |
451 | if (!fscrypt_info_cachep) | |
452 | goto fail_free_ctx; | |
453 | ||
454 | return 0; | |
455 | ||
456 | fail_free_ctx: | |
457 | kmem_cache_destroy(fscrypt_ctx_cachep); | |
458 | fail_free_queue: | |
459 | destroy_workqueue(fscrypt_read_workqueue); | |
460 | fail: | |
461 | return -ENOMEM; | |
462 | } | |
463 | module_init(fscrypt_init) | |
464 | ||
465 | /** | |
466 | * fscrypt_exit() - Shutdown the fs encryption system | |
467 | */ | |
468 | static void __exit fscrypt_exit(void) | |
469 | { | |
470 | fscrypt_destroy(); | |
471 | ||
472 | if (fscrypt_read_workqueue) | |
473 | destroy_workqueue(fscrypt_read_workqueue); | |
474 | kmem_cache_destroy(fscrypt_ctx_cachep); | |
475 | kmem_cache_destroy(fscrypt_info_cachep); | |
b7e7cf7a DW |
476 | |
477 | fscrypt_essiv_cleanup(); | |
0b81d077 JK |
478 | } |
479 | module_exit(fscrypt_exit); | |
480 | ||
481 | MODULE_LICENSE("GPL"); |