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27#include <linux/dcache.h>
28#include <linux/file.h>
29#include <linux/module.h>
30#include <linux/namei.h>
31#include <linux/skbuff.h>
32#include <linux/crypto.h>
33#include <linux/mount.h>
34#include <linux/pagemap.h>
35#include <linux/key.h>
36#include <linux/parser.h>
37#include <linux/fs_stack.h>
38#include <linux/ima.h>
39#include "ecryptfs_kernel.h"
40
41
42
43
44int ecryptfs_verbosity = 0;
45
46module_param(ecryptfs_verbosity, int, 0);
47MODULE_PARM_DESC(ecryptfs_verbosity,
48 "Initial verbosity level (0 or 1; defaults to "
49 "0, which is Quiet)");
50
51
52
53
54unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
55
56module_param(ecryptfs_message_buf_len, uint, 0);
57MODULE_PARM_DESC(ecryptfs_message_buf_len,
58 "Number of message buffer elements");
59
60
61
62
63
64
65
66signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
67
68module_param(ecryptfs_message_wait_timeout, long, 0);
69MODULE_PARM_DESC(ecryptfs_message_wait_timeout,
70 "Maximum number of seconds that an operation will "
71 "sleep while waiting for a message response from "
72 "userspace");
73
74
75
76
77
78
79unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS;
80
81module_param(ecryptfs_number_of_users, uint, 0);
82MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
83 "concurrent users of eCryptfs");
84
85void __ecryptfs_printk(const char *fmt, ...)
86{
87 va_list args;
88 va_start(args, fmt);
89 if (fmt[1] == '7') {
90 if (ecryptfs_verbosity >= 1)
91 vprintk(fmt, args);
92 } else
93 vprintk(fmt, args);
94 va_end(args);
95}
96
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116
117int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
118{
119 const struct cred *cred = current_cred();
120 struct ecryptfs_inode_info *inode_info =
121 ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
122 int opened_lower_file = 0;
123 int rc = 0;
124
125 mutex_lock(&inode_info->lower_file_mutex);
126 if (!inode_info->lower_file) {
127 struct dentry *lower_dentry;
128 struct vfsmount *lower_mnt =
129 ecryptfs_dentry_to_lower_mnt(ecryptfs_dentry);
130
131 lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
132 rc = ecryptfs_privileged_open(&inode_info->lower_file,
133 lower_dentry, lower_mnt, cred);
134 if (rc) {
135 printk(KERN_ERR "Error opening lower persistent file "
136 "for lower_dentry [0x%p] and lower_mnt [0x%p]; "
137 "rc = [%d]\n", lower_dentry, lower_mnt, rc);
138 inode_info->lower_file = NULL;
139 } else
140 opened_lower_file = 1;
141 }
142 mutex_unlock(&inode_info->lower_file_mutex);
143 if (opened_lower_file)
144 ima_counts_get(inode_info->lower_file);
145 return rc;
146}
147
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150
151
152
153
154
155
156
157
158
159int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
160 struct super_block *sb, u32 flags)
161{
162 struct inode *lower_inode;
163 struct inode *inode;
164 int rc = 0;
165
166 lower_inode = lower_dentry->d_inode;
167 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) {
168 rc = -EXDEV;
169 goto out;
170 }
171 if (!igrab(lower_inode)) {
172 rc = -ESTALE;
173 goto out;
174 }
175 inode = iget5_locked(sb, (unsigned long)lower_inode,
176 ecryptfs_inode_test, ecryptfs_inode_set,
177 lower_inode);
178 if (!inode) {
179 rc = -EACCES;
180 iput(lower_inode);
181 goto out;
182 }
183 if (inode->i_state & I_NEW)
184 unlock_new_inode(inode);
185 else
186 iput(lower_inode);
187 if (S_ISLNK(lower_inode->i_mode))
188 inode->i_op = &ecryptfs_symlink_iops;
189 else if (S_ISDIR(lower_inode->i_mode))
190 inode->i_op = &ecryptfs_dir_iops;
191 if (S_ISDIR(lower_inode->i_mode))
192 inode->i_fop = &ecryptfs_dir_fops;
193 if (special_file(lower_inode->i_mode))
194 init_special_inode(inode, lower_inode->i_mode,
195 lower_inode->i_rdev);
196 dentry->d_op = &ecryptfs_dops;
197 fsstack_copy_attr_all(inode, lower_inode, NULL);
198
199
200 fsstack_copy_inode_size(inode, lower_inode);
201 if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD)
202 d_add(dentry, inode);
203 else
204 d_instantiate(dentry, inode);
205out:
206 return rc;
207}
208
209enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
210 ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
211 ecryptfs_opt_ecryptfs_key_bytes,
212 ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
213 ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
214 ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
215 ecryptfs_opt_unlink_sigs, ecryptfs_opt_err };
216
217static const match_table_t tokens = {
218 {ecryptfs_opt_sig, "sig=%s"},
219 {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
220 {ecryptfs_opt_cipher, "cipher=%s"},
221 {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
222 {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
223 {ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
224 {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
225 {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
226 {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
227 {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
228 {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
229 {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
230 {ecryptfs_opt_err, NULL}
231};
232
233static int ecryptfs_init_global_auth_toks(
234 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
235{
236 struct ecryptfs_global_auth_tok *global_auth_tok;
237 int rc = 0;
238
239 list_for_each_entry(global_auth_tok,
240 &mount_crypt_stat->global_auth_tok_list,
241 mount_crypt_stat_list) {
242 rc = ecryptfs_keyring_auth_tok_for_sig(
243 &global_auth_tok->global_auth_tok_key,
244 &global_auth_tok->global_auth_tok,
245 global_auth_tok->sig);
246 if (rc) {
247 printk(KERN_ERR "Could not find valid key in user "
248 "session keyring for sig specified in mount "
249 "option: [%s]\n", global_auth_tok->sig);
250 global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
251 goto out;
252 } else
253 global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
254 }
255out:
256 return rc;
257}
258
259static void ecryptfs_init_mount_crypt_stat(
260 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
261{
262 memset((void *)mount_crypt_stat, 0,
263 sizeof(struct ecryptfs_mount_crypt_stat));
264 INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list);
265 mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex);
266 mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED;
267}
268
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286
287
288static int ecryptfs_parse_options(struct super_block *sb, char *options)
289{
290 char *p;
291 int rc = 0;
292 int sig_set = 0;
293 int cipher_name_set = 0;
294 int fn_cipher_name_set = 0;
295 int cipher_key_bytes;
296 int cipher_key_bytes_set = 0;
297 int fn_cipher_key_bytes;
298 int fn_cipher_key_bytes_set = 0;
299 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
300 &ecryptfs_superblock_to_private(sb)->mount_crypt_stat;
301 substring_t args[MAX_OPT_ARGS];
302 int token;
303 char *sig_src;
304 char *cipher_name_dst;
305 char *cipher_name_src;
306 char *fn_cipher_name_dst;
307 char *fn_cipher_name_src;
308 char *fnek_dst;
309 char *fnek_src;
310 char *cipher_key_bytes_src;
311 char *fn_cipher_key_bytes_src;
312
313 if (!options) {
314 rc = -EINVAL;
315 goto out;
316 }
317 ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
318 while ((p = strsep(&options, ",")) != NULL) {
319 if (!*p)
320 continue;
321 token = match_token(p, tokens, args);
322 switch (token) {
323 case ecryptfs_opt_sig:
324 case ecryptfs_opt_ecryptfs_sig:
325 sig_src = args[0].from;
326 rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
327 sig_src, 0);
328 if (rc) {
329 printk(KERN_ERR "Error attempting to register "
330 "global sig; rc = [%d]\n", rc);
331 goto out;
332 }
333 sig_set = 1;
334 break;
335 case ecryptfs_opt_cipher:
336 case ecryptfs_opt_ecryptfs_cipher:
337 cipher_name_src = args[0].from;
338 cipher_name_dst =
339 mount_crypt_stat->
340 global_default_cipher_name;
341 strncpy(cipher_name_dst, cipher_name_src,
342 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
343 cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
344 cipher_name_set = 1;
345 break;
346 case ecryptfs_opt_ecryptfs_key_bytes:
347 cipher_key_bytes_src = args[0].from;
348 cipher_key_bytes =
349 (int)simple_strtol(cipher_key_bytes_src,
350 &cipher_key_bytes_src, 0);
351 mount_crypt_stat->global_default_cipher_key_size =
352 cipher_key_bytes;
353 cipher_key_bytes_set = 1;
354 break;
355 case ecryptfs_opt_passthrough:
356 mount_crypt_stat->flags |=
357 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
358 break;
359 case ecryptfs_opt_xattr_metadata:
360 mount_crypt_stat->flags |=
361 ECRYPTFS_XATTR_METADATA_ENABLED;
362 break;
363 case ecryptfs_opt_encrypted_view:
364 mount_crypt_stat->flags |=
365 ECRYPTFS_XATTR_METADATA_ENABLED;
366 mount_crypt_stat->flags |=
367 ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
368 break;
369 case ecryptfs_opt_fnek_sig:
370 fnek_src = args[0].from;
371 fnek_dst =
372 mount_crypt_stat->global_default_fnek_sig;
373 strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
374 mount_crypt_stat->global_default_fnek_sig[
375 ECRYPTFS_SIG_SIZE_HEX] = '\0';
376 rc = ecryptfs_add_global_auth_tok(
377 mount_crypt_stat,
378 mount_crypt_stat->global_default_fnek_sig,
379 ECRYPTFS_AUTH_TOK_FNEK);
380 if (rc) {
381 printk(KERN_ERR "Error attempting to register "
382 "global fnek sig [%s]; rc = [%d]\n",
383 mount_crypt_stat->global_default_fnek_sig,
384 rc);
385 goto out;
386 }
387 mount_crypt_stat->flags |=
388 (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
389 | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
390 break;
391 case ecryptfs_opt_fn_cipher:
392 fn_cipher_name_src = args[0].from;
393 fn_cipher_name_dst =
394 mount_crypt_stat->global_default_fn_cipher_name;
395 strncpy(fn_cipher_name_dst, fn_cipher_name_src,
396 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
397 mount_crypt_stat->global_default_fn_cipher_name[
398 ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
399 fn_cipher_name_set = 1;
400 break;
401 case ecryptfs_opt_fn_cipher_key_bytes:
402 fn_cipher_key_bytes_src = args[0].from;
403 fn_cipher_key_bytes =
404 (int)simple_strtol(fn_cipher_key_bytes_src,
405 &fn_cipher_key_bytes_src, 0);
406 mount_crypt_stat->global_default_fn_cipher_key_bytes =
407 fn_cipher_key_bytes;
408 fn_cipher_key_bytes_set = 1;
409 break;
410 case ecryptfs_opt_unlink_sigs:
411 mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
412 break;
413 case ecryptfs_opt_err:
414 default:
415 printk(KERN_WARNING
416 "%s: eCryptfs: unrecognized option [%s]\n",
417 __func__, p);
418 }
419 }
420 if (!sig_set) {
421 rc = -EINVAL;
422 ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
423 "auth tok signature as a mount "
424 "parameter; see the eCryptfs README\n");
425 goto out;
426 }
427 if (!cipher_name_set) {
428 int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
429
430 BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
431 strcpy(mount_crypt_stat->global_default_cipher_name,
432 ECRYPTFS_DEFAULT_CIPHER);
433 }
434 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
435 && !fn_cipher_name_set)
436 strcpy(mount_crypt_stat->global_default_fn_cipher_name,
437 mount_crypt_stat->global_default_cipher_name);
438 if (!cipher_key_bytes_set)
439 mount_crypt_stat->global_default_cipher_key_size = 0;
440 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
441 && !fn_cipher_key_bytes_set)
442 mount_crypt_stat->global_default_fn_cipher_key_bytes =
443 mount_crypt_stat->global_default_cipher_key_size;
444 mutex_lock(&key_tfm_list_mutex);
445 if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
446 NULL)) {
447 rc = ecryptfs_add_new_key_tfm(
448 NULL, mount_crypt_stat->global_default_cipher_name,
449 mount_crypt_stat->global_default_cipher_key_size);
450 if (rc) {
451 printk(KERN_ERR "Error attempting to initialize "
452 "cipher with name = [%s] and key size = [%td]; "
453 "rc = [%d]\n",
454 mount_crypt_stat->global_default_cipher_name,
455 mount_crypt_stat->global_default_cipher_key_size,
456 rc);
457 rc = -EINVAL;
458 mutex_unlock(&key_tfm_list_mutex);
459 goto out;
460 }
461 }
462 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
463 && !ecryptfs_tfm_exists(
464 mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
465 rc = ecryptfs_add_new_key_tfm(
466 NULL, mount_crypt_stat->global_default_fn_cipher_name,
467 mount_crypt_stat->global_default_fn_cipher_key_bytes);
468 if (rc) {
469 printk(KERN_ERR "Error attempting to initialize "
470 "cipher with name = [%s] and key size = [%td]; "
471 "rc = [%d]\n",
472 mount_crypt_stat->global_default_fn_cipher_name,
473 mount_crypt_stat->global_default_fn_cipher_key_bytes,
474 rc);
475 rc = -EINVAL;
476 mutex_unlock(&key_tfm_list_mutex);
477 goto out;
478 }
479 }
480 mutex_unlock(&key_tfm_list_mutex);
481 rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
482 if (rc)
483 printk(KERN_WARNING "One or more global auth toks could not "
484 "properly register; rc = [%d]\n", rc);
485out:
486 return rc;
487}
488
489struct kmem_cache *ecryptfs_sb_info_cache;
490
491
492
493
494
495
496
497
498
499
500
501static int
502ecryptfs_fill_super(struct super_block *sb, void *raw_data, int silent)
503{
504 int rc = 0;
505
506
507 ecryptfs_set_superblock_private(sb,
508 kmem_cache_zalloc(ecryptfs_sb_info_cache,
509 GFP_KERNEL));
510 if (!ecryptfs_superblock_to_private(sb)) {
511 ecryptfs_printk(KERN_WARNING, "Out of memory\n");
512 rc = -ENOMEM;
513 goto out;
514 }
515 sb->s_op = &ecryptfs_sops;
516
517 sb->s_root = d_alloc(NULL, &(const struct qstr) {
518 .hash = 0,.name = "/",.len = 1});
519 if (!sb->s_root) {
520 ecryptfs_printk(KERN_ERR, "d_alloc failed\n");
521 rc = -ENOMEM;
522 goto out;
523 }
524 sb->s_root->d_op = &ecryptfs_dops;
525 sb->s_root->d_sb = sb;
526 sb->s_root->d_parent = sb->s_root;
527
528
529 ecryptfs_set_dentry_private(sb->s_root,
530 kmem_cache_zalloc(ecryptfs_dentry_info_cache,
531 GFP_KERNEL));
532 if (!ecryptfs_dentry_to_private(sb->s_root)) {
533 ecryptfs_printk(KERN_ERR,
534 "dentry_info_cache alloc failed\n");
535 rc = -ENOMEM;
536 goto out;
537 }
538 rc = 0;
539out:
540
541
542 return rc;
543}
544
545
546
547
548
549
550
551
552
553
554static int ecryptfs_read_super(struct super_block *sb, const char *dev_name)
555{
556 struct path path;
557 int rc;
558
559 rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
560 if (rc) {
561 ecryptfs_printk(KERN_WARNING, "path_lookup() failed\n");
562 goto out;
563 }
564 ecryptfs_set_superblock_lower(sb, path.dentry->d_sb);
565 sb->s_maxbytes = path.dentry->d_sb->s_maxbytes;
566 sb->s_blocksize = path.dentry->d_sb->s_blocksize;
567 ecryptfs_set_dentry_lower(sb->s_root, path.dentry);
568 ecryptfs_set_dentry_lower_mnt(sb->s_root, path.mnt);
569 rc = ecryptfs_interpose(path.dentry, sb->s_root, sb, 0);
570 if (rc)
571 goto out_free;
572 rc = 0;
573 goto out;
574out_free:
575 path_put(&path);
576out:
577 return rc;
578}
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596static int ecryptfs_get_sb(struct file_system_type *fs_type, int flags,
597 const char *dev_name, void *raw_data,
598 struct vfsmount *mnt)
599{
600 int rc;
601 struct super_block *sb;
602
603 rc = get_sb_nodev(fs_type, flags, raw_data, ecryptfs_fill_super, mnt);
604 if (rc < 0) {
605 printk(KERN_ERR "Getting sb failed; rc = [%d]\n", rc);
606 goto out;
607 }
608 sb = mnt->mnt_sb;
609 rc = ecryptfs_parse_options(sb, raw_data);
610 if (rc) {
611 printk(KERN_ERR "Error parsing options; rc = [%d]\n", rc);
612 goto out_abort;
613 }
614 rc = ecryptfs_read_super(sb, dev_name);
615 if (rc) {
616 printk(KERN_ERR "Reading sb failed; rc = [%d]\n", rc);
617 goto out_abort;
618 }
619 goto out;
620out_abort:
621 dput(sb->s_root);
622 deactivate_locked_super(sb);
623out:
624 return rc;
625}
626
627
628
629
630
631
632
633
634static void ecryptfs_kill_block_super(struct super_block *sb)
635{
636 generic_shutdown_super(sb);
637}
638
639static struct file_system_type ecryptfs_fs_type = {
640 .owner = THIS_MODULE,
641 .name = "ecryptfs",
642 .get_sb = ecryptfs_get_sb,
643 .kill_sb = ecryptfs_kill_block_super,
644 .fs_flags = 0
645};
646
647
648
649
650
651
652static void
653inode_info_init_once(void *vptr)
654{
655 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
656
657 inode_init_once(&ei->vfs_inode);
658}
659
660static struct ecryptfs_cache_info {
661 struct kmem_cache **cache;
662 const char *name;
663 size_t size;
664 void (*ctor)(void *obj);
665} ecryptfs_cache_infos[] = {
666 {
667 .cache = &ecryptfs_auth_tok_list_item_cache,
668 .name = "ecryptfs_auth_tok_list_item",
669 .size = sizeof(struct ecryptfs_auth_tok_list_item),
670 },
671 {
672 .cache = &ecryptfs_file_info_cache,
673 .name = "ecryptfs_file_cache",
674 .size = sizeof(struct ecryptfs_file_info),
675 },
676 {
677 .cache = &ecryptfs_dentry_info_cache,
678 .name = "ecryptfs_dentry_info_cache",
679 .size = sizeof(struct ecryptfs_dentry_info),
680 },
681 {
682 .cache = &ecryptfs_inode_info_cache,
683 .name = "ecryptfs_inode_cache",
684 .size = sizeof(struct ecryptfs_inode_info),
685 .ctor = inode_info_init_once,
686 },
687 {
688 .cache = &ecryptfs_sb_info_cache,
689 .name = "ecryptfs_sb_cache",
690 .size = sizeof(struct ecryptfs_sb_info),
691 },
692 {
693 .cache = &ecryptfs_header_cache_1,
694 .name = "ecryptfs_headers_1",
695 .size = PAGE_CACHE_SIZE,
696 },
697 {
698 .cache = &ecryptfs_header_cache_2,
699 .name = "ecryptfs_headers_2",
700 .size = PAGE_CACHE_SIZE,
701 },
702 {
703 .cache = &ecryptfs_xattr_cache,
704 .name = "ecryptfs_xattr_cache",
705 .size = PAGE_CACHE_SIZE,
706 },
707 {
708 .cache = &ecryptfs_key_record_cache,
709 .name = "ecryptfs_key_record_cache",
710 .size = sizeof(struct ecryptfs_key_record),
711 },
712 {
713 .cache = &ecryptfs_key_sig_cache,
714 .name = "ecryptfs_key_sig_cache",
715 .size = sizeof(struct ecryptfs_key_sig),
716 },
717 {
718 .cache = &ecryptfs_global_auth_tok_cache,
719 .name = "ecryptfs_global_auth_tok_cache",
720 .size = sizeof(struct ecryptfs_global_auth_tok),
721 },
722 {
723 .cache = &ecryptfs_key_tfm_cache,
724 .name = "ecryptfs_key_tfm_cache",
725 .size = sizeof(struct ecryptfs_key_tfm),
726 },
727 {
728 .cache = &ecryptfs_open_req_cache,
729 .name = "ecryptfs_open_req_cache",
730 .size = sizeof(struct ecryptfs_open_req),
731 },
732};
733
734static void ecryptfs_free_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 if (*(info->cache))
743 kmem_cache_destroy(*(info->cache));
744 }
745}
746
747
748
749
750
751
752static int ecryptfs_init_kmem_caches(void)
753{
754 int i;
755
756 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
757 struct ecryptfs_cache_info *info;
758
759 info = &ecryptfs_cache_infos[i];
760 *(info->cache) = kmem_cache_create(info->name, info->size,
761 0, SLAB_HWCACHE_ALIGN, info->ctor);
762 if (!*(info->cache)) {
763 ecryptfs_free_kmem_caches();
764 ecryptfs_printk(KERN_WARNING, "%s: "
765 "kmem_cache_create failed\n",
766 info->name);
767 return -ENOMEM;
768 }
769 }
770 return 0;
771}
772
773static struct kobject *ecryptfs_kobj;
774
775static ssize_t version_show(struct kobject *kobj,
776 struct kobj_attribute *attr, char *buff)
777{
778 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
779}
780
781static struct kobj_attribute version_attr = __ATTR_RO(version);
782
783static struct attribute *attributes[] = {
784 &version_attr.attr,
785 NULL,
786};
787
788static struct attribute_group attr_group = {
789 .attrs = attributes,
790};
791
792static int do_sysfs_registration(void)
793{
794 int rc;
795
796 ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj);
797 if (!ecryptfs_kobj) {
798 printk(KERN_ERR "Unable to create ecryptfs kset\n");
799 rc = -ENOMEM;
800 goto out;
801 }
802 rc = sysfs_create_group(ecryptfs_kobj, &attr_group);
803 if (rc) {
804 printk(KERN_ERR
805 "Unable to create ecryptfs version attributes\n");
806 kobject_put(ecryptfs_kobj);
807 }
808out:
809 return rc;
810}
811
812static void do_sysfs_unregistration(void)
813{
814 sysfs_remove_group(ecryptfs_kobj, &attr_group);
815 kobject_put(ecryptfs_kobj);
816}
817
818static int __init ecryptfs_init(void)
819{
820 int rc;
821
822 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) {
823 rc = -EINVAL;
824 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
825 "larger than the host's page size, and so "
826 "eCryptfs cannot run on this system. The "
827 "default eCryptfs extent size is [%d] bytes; "
828 "the page size is [%d] bytes.\n",
829 ECRYPTFS_DEFAULT_EXTENT_SIZE, PAGE_CACHE_SIZE);
830 goto out;
831 }
832 rc = ecryptfs_init_kmem_caches();
833 if (rc) {
834 printk(KERN_ERR
835 "Failed to allocate one or more kmem_cache objects\n");
836 goto out;
837 }
838 rc = register_filesystem(&ecryptfs_fs_type);
839 if (rc) {
840 printk(KERN_ERR "Failed to register filesystem\n");
841 goto out_free_kmem_caches;
842 }
843 rc = do_sysfs_registration();
844 if (rc) {
845 printk(KERN_ERR "sysfs registration failed\n");
846 goto out_unregister_filesystem;
847 }
848 rc = ecryptfs_init_kthread();
849 if (rc) {
850 printk(KERN_ERR "%s: kthread initialization failed; "
851 "rc = [%d]\n", __func__, rc);
852 goto out_do_sysfs_unregistration;
853 }
854 rc = ecryptfs_init_messaging();
855 if (rc) {
856 printk(KERN_ERR "Failure occured while attempting to "
857 "initialize the communications channel to "
858 "ecryptfsd\n");
859 goto out_destroy_kthread;
860 }
861 rc = ecryptfs_init_crypto();
862 if (rc) {
863 printk(KERN_ERR "Failure whilst attempting to init crypto; "
864 "rc = [%d]\n", rc);
865 goto out_release_messaging;
866 }
867 if (ecryptfs_verbosity > 0)
868 printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
869 "will be written to the syslog!\n", ecryptfs_verbosity);
870
871 goto out;
872out_release_messaging:
873 ecryptfs_release_messaging();
874out_destroy_kthread:
875 ecryptfs_destroy_kthread();
876out_do_sysfs_unregistration:
877 do_sysfs_unregistration();
878out_unregister_filesystem:
879 unregister_filesystem(&ecryptfs_fs_type);
880out_free_kmem_caches:
881 ecryptfs_free_kmem_caches();
882out:
883 return rc;
884}
885
886static void __exit ecryptfs_exit(void)
887{
888 int rc;
889
890 rc = ecryptfs_destroy_crypto();
891 if (rc)
892 printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
893 "rc = [%d]\n", rc);
894 ecryptfs_release_messaging();
895 ecryptfs_destroy_kthread();
896 do_sysfs_unregistration();
897 unregister_filesystem(&ecryptfs_fs_type);
898 ecryptfs_free_kmem_caches();
899}
900
901MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
902MODULE_DESCRIPTION("eCryptfs");
903
904MODULE_LICENSE("GPL");
905
906module_init(ecryptfs_init)
907module_exit(ecryptfs_exit)
908