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13#include <linux/dcache.h>
14#include <linux/file.h>
15#include <linux/module.h>
16#include <linux/namei.h>
17#include <linux/skbuff.h>
18#include <linux/mount.h>
19#include <linux/pagemap.h>
20#include <linux/key.h>
21#include <linux/parser.h>
22#include <linux/fs_stack.h>
23#include <linux/slab.h>
24#include <linux/magic.h>
25#include "ecryptfs_kernel.h"
26
27
28
29
30int ecryptfs_verbosity = 0;
31
32module_param(ecryptfs_verbosity, int, 0);
33MODULE_PARM_DESC(ecryptfs_verbosity,
34 "Initial verbosity level (0 or 1; defaults to "
35 "0, which is Quiet)");
36
37
38
39
40unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
41
42module_param(ecryptfs_message_buf_len, uint, 0);
43MODULE_PARM_DESC(ecryptfs_message_buf_len,
44 "Number of message buffer elements");
45
46
47
48
49
50
51
52signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
53
54module_param(ecryptfs_message_wait_timeout, long, 0);
55MODULE_PARM_DESC(ecryptfs_message_wait_timeout,
56 "Maximum number of seconds that an operation will "
57 "sleep while waiting for a message response from "
58 "userspace");
59
60
61
62
63
64
65unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS;
66
67module_param(ecryptfs_number_of_users, uint, 0);
68MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
69 "concurrent users of eCryptfs");
70
71void __ecryptfs_printk(const char *fmt, ...)
72{
73 va_list args;
74 va_start(args, fmt);
75 if (fmt[1] == '7') {
76 if (ecryptfs_verbosity >= 1)
77 vprintk(fmt, args);
78 } else
79 vprintk(fmt, args);
80 va_end(args);
81}
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103
104static int ecryptfs_init_lower_file(struct dentry *dentry,
105 struct file **lower_file)
106{
107 const struct cred *cred = current_cred();
108 struct path *path = ecryptfs_dentry_to_lower_path(dentry);
109 int rc;
110
111 rc = ecryptfs_privileged_open(lower_file, path->dentry, path->mnt,
112 cred);
113 if (rc) {
114 printk(KERN_ERR "Error opening lower file "
115 "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
116 "rc = [%d]\n", path->dentry, path->mnt, rc);
117 (*lower_file) = NULL;
118 }
119 return rc;
120}
121
122int ecryptfs_get_lower_file(struct dentry *dentry, struct inode *inode)
123{
124 struct ecryptfs_inode_info *inode_info;
125 int count, rc = 0;
126
127 inode_info = ecryptfs_inode_to_private(inode);
128 mutex_lock(&inode_info->lower_file_mutex);
129 count = atomic_inc_return(&inode_info->lower_file_count);
130 if (WARN_ON_ONCE(count < 1))
131 rc = -EINVAL;
132 else if (count == 1) {
133 rc = ecryptfs_init_lower_file(dentry,
134 &inode_info->lower_file);
135 if (rc)
136 atomic_set(&inode_info->lower_file_count, 0);
137 }
138 mutex_unlock(&inode_info->lower_file_mutex);
139 return rc;
140}
141
142void ecryptfs_put_lower_file(struct inode *inode)
143{
144 struct ecryptfs_inode_info *inode_info;
145
146 inode_info = ecryptfs_inode_to_private(inode);
147 if (atomic_dec_and_mutex_lock(&inode_info->lower_file_count,
148 &inode_info->lower_file_mutex)) {
149 filemap_write_and_wait(inode->i_mapping);
150 fput(inode_info->lower_file);
151 inode_info->lower_file = NULL;
152 mutex_unlock(&inode_info->lower_file_mutex);
153 }
154}
155
156enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
157 ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
158 ecryptfs_opt_ecryptfs_key_bytes,
159 ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
160 ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
161 ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
162 ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
163 ecryptfs_opt_check_dev_ruid,
164 ecryptfs_opt_err };
165
166static const match_table_t tokens = {
167 {ecryptfs_opt_sig, "sig=%s"},
168 {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
169 {ecryptfs_opt_cipher, "cipher=%s"},
170 {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
171 {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
172 {ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
173 {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
174 {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
175 {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
176 {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
177 {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
178 {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
179 {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
180 {ecryptfs_opt_check_dev_ruid, "ecryptfs_check_dev_ruid"},
181 {ecryptfs_opt_err, NULL}
182};
183
184static int ecryptfs_init_global_auth_toks(
185 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
186{
187 struct ecryptfs_global_auth_tok *global_auth_tok;
188 struct ecryptfs_auth_tok *auth_tok;
189 int rc = 0;
190
191 list_for_each_entry(global_auth_tok,
192 &mount_crypt_stat->global_auth_tok_list,
193 mount_crypt_stat_list) {
194 rc = ecryptfs_keyring_auth_tok_for_sig(
195 &global_auth_tok->global_auth_tok_key, &auth_tok,
196 global_auth_tok->sig);
197 if (rc) {
198 printk(KERN_ERR "Could not find valid key in user "
199 "session keyring for sig specified in mount "
200 "option: [%s]\n", global_auth_tok->sig);
201 global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
202 goto out;
203 } else {
204 global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
205 up_write(&(global_auth_tok->global_auth_tok_key)->sem);
206 }
207 }
208out:
209 return rc;
210}
211
212static void ecryptfs_init_mount_crypt_stat(
213 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
214{
215 memset((void *)mount_crypt_stat, 0,
216 sizeof(struct ecryptfs_mount_crypt_stat));
217 INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list);
218 mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex);
219 mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED;
220}
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241
242static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options,
243 uid_t *check_ruid)
244{
245 char *p;
246 int rc = 0;
247 int sig_set = 0;
248 int cipher_name_set = 0;
249 int fn_cipher_name_set = 0;
250 int cipher_key_bytes;
251 int cipher_key_bytes_set = 0;
252 int fn_cipher_key_bytes;
253 int fn_cipher_key_bytes_set = 0;
254 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
255 &sbi->mount_crypt_stat;
256 substring_t args[MAX_OPT_ARGS];
257 int token;
258 char *sig_src;
259 char *cipher_name_dst;
260 char *cipher_name_src;
261 char *fn_cipher_name_dst;
262 char *fn_cipher_name_src;
263 char *fnek_dst;
264 char *fnek_src;
265 char *cipher_key_bytes_src;
266 char *fn_cipher_key_bytes_src;
267 u8 cipher_code;
268
269 *check_ruid = 0;
270
271 if (!options) {
272 rc = -EINVAL;
273 goto out;
274 }
275 ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
276 while ((p = strsep(&options, ",")) != NULL) {
277 if (!*p)
278 continue;
279 token = match_token(p, tokens, args);
280 switch (token) {
281 case ecryptfs_opt_sig:
282 case ecryptfs_opt_ecryptfs_sig:
283 sig_src = args[0].from;
284 rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
285 sig_src, 0);
286 if (rc) {
287 printk(KERN_ERR "Error attempting to register "
288 "global sig; rc = [%d]\n", rc);
289 goto out;
290 }
291 sig_set = 1;
292 break;
293 case ecryptfs_opt_cipher:
294 case ecryptfs_opt_ecryptfs_cipher:
295 cipher_name_src = args[0].from;
296 cipher_name_dst =
297 mount_crypt_stat->
298 global_default_cipher_name;
299 strncpy(cipher_name_dst, cipher_name_src,
300 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
301 cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
302 cipher_name_set = 1;
303 break;
304 case ecryptfs_opt_ecryptfs_key_bytes:
305 cipher_key_bytes_src = args[0].from;
306 cipher_key_bytes =
307 (int)simple_strtol(cipher_key_bytes_src,
308 &cipher_key_bytes_src, 0);
309 mount_crypt_stat->global_default_cipher_key_size =
310 cipher_key_bytes;
311 cipher_key_bytes_set = 1;
312 break;
313 case ecryptfs_opt_passthrough:
314 mount_crypt_stat->flags |=
315 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
316 break;
317 case ecryptfs_opt_xattr_metadata:
318 mount_crypt_stat->flags |=
319 ECRYPTFS_XATTR_METADATA_ENABLED;
320 break;
321 case ecryptfs_opt_encrypted_view:
322 mount_crypt_stat->flags |=
323 ECRYPTFS_XATTR_METADATA_ENABLED;
324 mount_crypt_stat->flags |=
325 ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
326 break;
327 case ecryptfs_opt_fnek_sig:
328 fnek_src = args[0].from;
329 fnek_dst =
330 mount_crypt_stat->global_default_fnek_sig;
331 strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
332 mount_crypt_stat->global_default_fnek_sig[
333 ECRYPTFS_SIG_SIZE_HEX] = '\0';
334 rc = ecryptfs_add_global_auth_tok(
335 mount_crypt_stat,
336 mount_crypt_stat->global_default_fnek_sig,
337 ECRYPTFS_AUTH_TOK_FNEK);
338 if (rc) {
339 printk(KERN_ERR "Error attempting to register "
340 "global fnek sig [%s]; rc = [%d]\n",
341 mount_crypt_stat->global_default_fnek_sig,
342 rc);
343 goto out;
344 }
345 mount_crypt_stat->flags |=
346 (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
347 | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
348 break;
349 case ecryptfs_opt_fn_cipher:
350 fn_cipher_name_src = args[0].from;
351 fn_cipher_name_dst =
352 mount_crypt_stat->global_default_fn_cipher_name;
353 strncpy(fn_cipher_name_dst, fn_cipher_name_src,
354 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
355 mount_crypt_stat->global_default_fn_cipher_name[
356 ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
357 fn_cipher_name_set = 1;
358 break;
359 case ecryptfs_opt_fn_cipher_key_bytes:
360 fn_cipher_key_bytes_src = args[0].from;
361 fn_cipher_key_bytes =
362 (int)simple_strtol(fn_cipher_key_bytes_src,
363 &fn_cipher_key_bytes_src, 0);
364 mount_crypt_stat->global_default_fn_cipher_key_bytes =
365 fn_cipher_key_bytes;
366 fn_cipher_key_bytes_set = 1;
367 break;
368 case ecryptfs_opt_unlink_sigs:
369 mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
370 break;
371 case ecryptfs_opt_mount_auth_tok_only:
372 mount_crypt_stat->flags |=
373 ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
374 break;
375 case ecryptfs_opt_check_dev_ruid:
376 *check_ruid = 1;
377 break;
378 case ecryptfs_opt_err:
379 default:
380 printk(KERN_WARNING
381 "%s: eCryptfs: unrecognized option [%s]\n",
382 __func__, p);
383 }
384 }
385 if (!sig_set) {
386 rc = -EINVAL;
387 ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
388 "auth tok signature as a mount "
389 "parameter; see the eCryptfs README\n");
390 goto out;
391 }
392 if (!cipher_name_set) {
393 int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
394
395 BUG_ON(cipher_name_len > ECRYPTFS_MAX_CIPHER_NAME_SIZE);
396 strcpy(mount_crypt_stat->global_default_cipher_name,
397 ECRYPTFS_DEFAULT_CIPHER);
398 }
399 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
400 && !fn_cipher_name_set)
401 strcpy(mount_crypt_stat->global_default_fn_cipher_name,
402 mount_crypt_stat->global_default_cipher_name);
403 if (!cipher_key_bytes_set)
404 mount_crypt_stat->global_default_cipher_key_size = 0;
405 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
406 && !fn_cipher_key_bytes_set)
407 mount_crypt_stat->global_default_fn_cipher_key_bytes =
408 mount_crypt_stat->global_default_cipher_key_size;
409
410 cipher_code = ecryptfs_code_for_cipher_string(
411 mount_crypt_stat->global_default_cipher_name,
412 mount_crypt_stat->global_default_cipher_key_size);
413 if (!cipher_code) {
414 ecryptfs_printk(KERN_ERR,
415 "eCryptfs doesn't support cipher: %s\n",
416 mount_crypt_stat->global_default_cipher_name);
417 rc = -EINVAL;
418 goto out;
419 }
420
421 mutex_lock(&key_tfm_list_mutex);
422 if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
423 NULL)) {
424 rc = ecryptfs_add_new_key_tfm(
425 NULL, mount_crypt_stat->global_default_cipher_name,
426 mount_crypt_stat->global_default_cipher_key_size);
427 if (rc) {
428 printk(KERN_ERR "Error attempting to initialize "
429 "cipher with name = [%s] and key size = [%td]; "
430 "rc = [%d]\n",
431 mount_crypt_stat->global_default_cipher_name,
432 mount_crypt_stat->global_default_cipher_key_size,
433 rc);
434 rc = -EINVAL;
435 mutex_unlock(&key_tfm_list_mutex);
436 goto out;
437 }
438 }
439 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
440 && !ecryptfs_tfm_exists(
441 mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
442 rc = ecryptfs_add_new_key_tfm(
443 NULL, mount_crypt_stat->global_default_fn_cipher_name,
444 mount_crypt_stat->global_default_fn_cipher_key_bytes);
445 if (rc) {
446 printk(KERN_ERR "Error attempting to initialize "
447 "cipher with name = [%s] and key size = [%td]; "
448 "rc = [%d]\n",
449 mount_crypt_stat->global_default_fn_cipher_name,
450 mount_crypt_stat->global_default_fn_cipher_key_bytes,
451 rc);
452 rc = -EINVAL;
453 mutex_unlock(&key_tfm_list_mutex);
454 goto out;
455 }
456 }
457 mutex_unlock(&key_tfm_list_mutex);
458 rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
459 if (rc)
460 printk(KERN_WARNING "One or more global auth toks could not "
461 "properly register; rc = [%d]\n", rc);
462out:
463 return rc;
464}
465
466struct kmem_cache *ecryptfs_sb_info_cache;
467static struct file_system_type ecryptfs_fs_type;
468
469
470
471
472
473
474
475
476static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags,
477 const char *dev_name, void *raw_data)
478{
479 struct super_block *s;
480 struct ecryptfs_sb_info *sbi;
481 struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
482 struct ecryptfs_dentry_info *root_info;
483 const char *err = "Getting sb failed";
484 struct inode *inode;
485 struct path path;
486 uid_t check_ruid;
487 int rc;
488
489 sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
490 if (!sbi) {
491 rc = -ENOMEM;
492 goto out;
493 }
494
495 rc = ecryptfs_parse_options(sbi, raw_data, &check_ruid);
496 if (rc) {
497 err = "Error parsing options";
498 goto out;
499 }
500 mount_crypt_stat = &sbi->mount_crypt_stat;
501
502 s = sget(fs_type, NULL, set_anon_super, flags, NULL);
503 if (IS_ERR(s)) {
504 rc = PTR_ERR(s);
505 goto out;
506 }
507
508 rc = super_setup_bdi(s);
509 if (rc)
510 goto out1;
511
512 ecryptfs_set_superblock_private(s, sbi);
513
514
515 sbi = NULL;
516 s->s_op = &ecryptfs_sops;
517 s->s_xattr = ecryptfs_xattr_handlers;
518 s->s_d_op = &ecryptfs_dops;
519
520 err = "Reading sb failed";
521 rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
522 if (rc) {
523 ecryptfs_printk(KERN_WARNING, "kern_path() failed\n");
524 goto out1;
525 }
526 if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
527 rc = -EINVAL;
528 printk(KERN_ERR "Mount on filesystem of type "
529 "eCryptfs explicitly disallowed due to "
530 "known incompatibilities\n");
531 goto out_free;
532 }
533
534 if (check_ruid && !uid_eq(d_inode(path.dentry)->i_uid, current_uid())) {
535 rc = -EPERM;
536 printk(KERN_ERR "Mount of device (uid: %d) not owned by "
537 "requested user (uid: %d)\n",
538 i_uid_read(d_inode(path.dentry)),
539 from_kuid(&init_user_ns, current_uid()));
540 goto out_free;
541 }
542
543 ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
544
545
546
547
548
549 s->s_flags = flags & ~SB_POSIXACL;
550 s->s_flags |= path.dentry->d_sb->s_flags & SB_POSIXACL;
551
552
553
554
555
556
557 if (sb_rdonly(path.dentry->d_sb) || mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
558 s->s_flags |= SB_RDONLY;
559
560 s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
561 s->s_blocksize = path.dentry->d_sb->s_blocksize;
562 s->s_magic = ECRYPTFS_SUPER_MAGIC;
563 s->s_stack_depth = path.dentry->d_sb->s_stack_depth + 1;
564
565 rc = -EINVAL;
566 if (s->s_stack_depth > FILESYSTEM_MAX_STACK_DEPTH) {
567 pr_err("eCryptfs: maximum fs stacking depth exceeded\n");
568 goto out_free;
569 }
570
571 inode = ecryptfs_get_inode(d_inode(path.dentry), s);
572 rc = PTR_ERR(inode);
573 if (IS_ERR(inode))
574 goto out_free;
575
576 s->s_root = d_make_root(inode);
577 if (!s->s_root) {
578 rc = -ENOMEM;
579 goto out_free;
580 }
581
582 rc = -ENOMEM;
583 root_info = kmem_cache_zalloc(ecryptfs_dentry_info_cache, GFP_KERNEL);
584 if (!root_info)
585 goto out_free;
586
587
588 ecryptfs_set_dentry_private(s->s_root, root_info);
589 root_info->lower_path = path;
590
591 s->s_flags |= SB_ACTIVE;
592 return dget(s->s_root);
593
594out_free:
595 path_put(&path);
596out1:
597 deactivate_locked_super(s);
598out:
599 if (sbi) {
600 ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
601 kmem_cache_free(ecryptfs_sb_info_cache, sbi);
602 }
603 printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
604 return ERR_PTR(rc);
605}
606
607
608
609
610
611
612
613static void ecryptfs_kill_block_super(struct super_block *sb)
614{
615 struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
616 kill_anon_super(sb);
617 if (!sb_info)
618 return;
619 ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
620 kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
621}
622
623static struct file_system_type ecryptfs_fs_type = {
624 .owner = THIS_MODULE,
625 .name = "ecryptfs",
626 .mount = ecryptfs_mount,
627 .kill_sb = ecryptfs_kill_block_super,
628 .fs_flags = 0
629};
630MODULE_ALIAS_FS("ecryptfs");
631
632
633
634
635
636
637static void
638inode_info_init_once(void *vptr)
639{
640 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
641
642 inode_init_once(&ei->vfs_inode);
643}
644
645static struct ecryptfs_cache_info {
646 struct kmem_cache **cache;
647 const char *name;
648 size_t size;
649 slab_flags_t flags;
650 void (*ctor)(void *obj);
651} ecryptfs_cache_infos[] = {
652 {
653 .cache = &ecryptfs_auth_tok_list_item_cache,
654 .name = "ecryptfs_auth_tok_list_item",
655 .size = sizeof(struct ecryptfs_auth_tok_list_item),
656 },
657 {
658 .cache = &ecryptfs_file_info_cache,
659 .name = "ecryptfs_file_cache",
660 .size = sizeof(struct ecryptfs_file_info),
661 },
662 {
663 .cache = &ecryptfs_dentry_info_cache,
664 .name = "ecryptfs_dentry_info_cache",
665 .size = sizeof(struct ecryptfs_dentry_info),
666 },
667 {
668 .cache = &ecryptfs_inode_info_cache,
669 .name = "ecryptfs_inode_cache",
670 .size = sizeof(struct ecryptfs_inode_info),
671 .flags = SLAB_ACCOUNT,
672 .ctor = inode_info_init_once,
673 },
674 {
675 .cache = &ecryptfs_sb_info_cache,
676 .name = "ecryptfs_sb_cache",
677 .size = sizeof(struct ecryptfs_sb_info),
678 },
679 {
680 .cache = &ecryptfs_header_cache,
681 .name = "ecryptfs_headers",
682 .size = PAGE_SIZE,
683 },
684 {
685 .cache = &ecryptfs_xattr_cache,
686 .name = "ecryptfs_xattr_cache",
687 .size = PAGE_SIZE,
688 },
689 {
690 .cache = &ecryptfs_key_record_cache,
691 .name = "ecryptfs_key_record_cache",
692 .size = sizeof(struct ecryptfs_key_record),
693 },
694 {
695 .cache = &ecryptfs_key_sig_cache,
696 .name = "ecryptfs_key_sig_cache",
697 .size = sizeof(struct ecryptfs_key_sig),
698 },
699 {
700 .cache = &ecryptfs_global_auth_tok_cache,
701 .name = "ecryptfs_global_auth_tok_cache",
702 .size = sizeof(struct ecryptfs_global_auth_tok),
703 },
704 {
705 .cache = &ecryptfs_key_tfm_cache,
706 .name = "ecryptfs_key_tfm_cache",
707 .size = sizeof(struct ecryptfs_key_tfm),
708 },
709};
710
711static void ecryptfs_free_kmem_caches(void)
712{
713 int i;
714
715
716
717
718
719 rcu_barrier();
720
721 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
722 struct ecryptfs_cache_info *info;
723
724 info = &ecryptfs_cache_infos[i];
725 kmem_cache_destroy(*(info->cache));
726 }
727}
728
729
730
731
732
733
734static int ecryptfs_init_kmem_caches(void)
735{
736 int i;
737
738 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
739 struct ecryptfs_cache_info *info;
740
741 info = &ecryptfs_cache_infos[i];
742 *(info->cache) = kmem_cache_create(info->name, info->size, 0,
743 SLAB_HWCACHE_ALIGN | info->flags, info->ctor);
744 if (!*(info->cache)) {
745 ecryptfs_free_kmem_caches();
746 ecryptfs_printk(KERN_WARNING, "%s: "
747 "kmem_cache_create failed\n",
748 info->name);
749 return -ENOMEM;
750 }
751 }
752 return 0;
753}
754
755static struct kobject *ecryptfs_kobj;
756
757static ssize_t version_show(struct kobject *kobj,
758 struct kobj_attribute *attr, char *buff)
759{
760 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
761}
762
763static struct kobj_attribute version_attr = __ATTR_RO(version);
764
765static struct attribute *attributes[] = {
766 &version_attr.attr,
767 NULL,
768};
769
770static const struct attribute_group attr_group = {
771 .attrs = attributes,
772};
773
774static int do_sysfs_registration(void)
775{
776 int rc;
777
778 ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj);
779 if (!ecryptfs_kobj) {
780 printk(KERN_ERR "Unable to create ecryptfs kset\n");
781 rc = -ENOMEM;
782 goto out;
783 }
784 rc = sysfs_create_group(ecryptfs_kobj, &attr_group);
785 if (rc) {
786 printk(KERN_ERR
787 "Unable to create ecryptfs version attributes\n");
788 kobject_put(ecryptfs_kobj);
789 }
790out:
791 return rc;
792}
793
794static void do_sysfs_unregistration(void)
795{
796 sysfs_remove_group(ecryptfs_kobj, &attr_group);
797 kobject_put(ecryptfs_kobj);
798}
799
800static int __init ecryptfs_init(void)
801{
802 int rc;
803
804 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_SIZE) {
805 rc = -EINVAL;
806 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
807 "larger than the host's page size, and so "
808 "eCryptfs cannot run on this system. The "
809 "default eCryptfs extent size is [%u] bytes; "
810 "the page size is [%lu] bytes.\n",
811 ECRYPTFS_DEFAULT_EXTENT_SIZE,
812 (unsigned long)PAGE_SIZE);
813 goto out;
814 }
815 rc = ecryptfs_init_kmem_caches();
816 if (rc) {
817 printk(KERN_ERR
818 "Failed to allocate one or more kmem_cache objects\n");
819 goto out;
820 }
821 rc = do_sysfs_registration();
822 if (rc) {
823 printk(KERN_ERR "sysfs registration failed\n");
824 goto out_free_kmem_caches;
825 }
826 rc = ecryptfs_init_kthread();
827 if (rc) {
828 printk(KERN_ERR "%s: kthread initialization failed; "
829 "rc = [%d]\n", __func__, rc);
830 goto out_do_sysfs_unregistration;
831 }
832 rc = ecryptfs_init_messaging();
833 if (rc) {
834 printk(KERN_ERR "Failure occurred while attempting to "
835 "initialize the communications channel to "
836 "ecryptfsd\n");
837 goto out_destroy_kthread;
838 }
839 rc = ecryptfs_init_crypto();
840 if (rc) {
841 printk(KERN_ERR "Failure whilst attempting to init crypto; "
842 "rc = [%d]\n", rc);
843 goto out_release_messaging;
844 }
845 rc = register_filesystem(&ecryptfs_fs_type);
846 if (rc) {
847 printk(KERN_ERR "Failed to register filesystem\n");
848 goto out_destroy_crypto;
849 }
850 if (ecryptfs_verbosity > 0)
851 printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
852 "will be written to the syslog!\n", ecryptfs_verbosity);
853
854 goto out;
855out_destroy_crypto:
856 ecryptfs_destroy_crypto();
857out_release_messaging:
858 ecryptfs_release_messaging();
859out_destroy_kthread:
860 ecryptfs_destroy_kthread();
861out_do_sysfs_unregistration:
862 do_sysfs_unregistration();
863out_free_kmem_caches:
864 ecryptfs_free_kmem_caches();
865out:
866 return rc;
867}
868
869static void __exit ecryptfs_exit(void)
870{
871 int rc;
872
873 rc = ecryptfs_destroy_crypto();
874 if (rc)
875 printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
876 "rc = [%d]\n", rc);
877 ecryptfs_release_messaging();
878 ecryptfs_destroy_kthread();
879 do_sysfs_unregistration();
880 unregister_filesystem(&ecryptfs_fs_type);
881 ecryptfs_free_kmem_caches();
882}
883
884MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
885MODULE_DESCRIPTION("eCryptfs");
886
887MODULE_LICENSE("GPL");
888
889module_init(ecryptfs_init)
890module_exit(ecryptfs_exit)
891
