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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/slab.h>
39#include <linux/magic.h>
40#include "ecryptfs_kernel.h"
41
42
43
44
45int ecryptfs_verbosity = 0;
46
47module_param(ecryptfs_verbosity, int, 0);
48MODULE_PARM_DESC(ecryptfs_verbosity,
49 "Initial verbosity level (0 or 1; defaults to "
50 "0, which is Quiet)");
51
52
53
54
55unsigned int ecryptfs_message_buf_len = ECRYPTFS_DEFAULT_MSG_CTX_ELEMS;
56
57module_param(ecryptfs_message_buf_len, uint, 0);
58MODULE_PARM_DESC(ecryptfs_message_buf_len,
59 "Number of message buffer elements");
60
61
62
63
64
65
66
67signed long ecryptfs_message_wait_timeout = ECRYPTFS_MAX_MSG_CTX_TTL / HZ;
68
69module_param(ecryptfs_message_wait_timeout, long, 0);
70MODULE_PARM_DESC(ecryptfs_message_wait_timeout,
71 "Maximum number of seconds that an operation will "
72 "sleep while waiting for a message response from "
73 "userspace");
74
75
76
77
78
79
80unsigned int ecryptfs_number_of_users = ECRYPTFS_DEFAULT_NUM_USERS;
81
82module_param(ecryptfs_number_of_users, uint, 0);
83MODULE_PARM_DESC(ecryptfs_number_of_users, "An estimate of the number of "
84 "concurrent users of eCryptfs");
85
86void __ecryptfs_printk(const char *fmt, ...)
87{
88 va_list args;
89 va_start(args, fmt);
90 if (fmt[1] == '7') {
91 if (ecryptfs_verbosity >= 1)
92 vprintk(fmt, args);
93 } else
94 vprintk(fmt, args);
95 va_end(args);
96}
97
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117
118int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
119{
120 const struct cred *cred = current_cred();
121 struct ecryptfs_inode_info *inode_info =
122 ecryptfs_inode_to_private(ecryptfs_dentry->d_inode);
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 }
140 }
141 mutex_unlock(&inode_info->lower_file_mutex);
142 return rc;
143}
144
145static struct inode *ecryptfs_get_inode(struct inode *lower_inode,
146 struct super_block *sb)
147{
148 struct inode *inode;
149 int rc = 0;
150
151 if (lower_inode->i_sb != ecryptfs_superblock_to_lower(sb)) {
152 rc = -EXDEV;
153 goto out;
154 }
155 if (!igrab(lower_inode)) {
156 rc = -ESTALE;
157 goto out;
158 }
159 inode = iget5_locked(sb, (unsigned long)lower_inode,
160 ecryptfs_inode_test, ecryptfs_inode_set,
161 lower_inode);
162 if (!inode) {
163 rc = -EACCES;
164 iput(lower_inode);
165 goto out;
166 }
167 if (inode->i_state & I_NEW)
168 unlock_new_inode(inode);
169 else
170 iput(lower_inode);
171 if (S_ISLNK(lower_inode->i_mode))
172 inode->i_op = &ecryptfs_symlink_iops;
173 else if (S_ISDIR(lower_inode->i_mode))
174 inode->i_op = &ecryptfs_dir_iops;
175 if (S_ISDIR(lower_inode->i_mode))
176 inode->i_fop = &ecryptfs_dir_fops;
177 if (special_file(lower_inode->i_mode))
178 init_special_inode(inode, lower_inode->i_mode,
179 lower_inode->i_rdev);
180 fsstack_copy_attr_all(inode, lower_inode);
181
182
183 fsstack_copy_inode_size(inode, lower_inode);
184 return inode;
185out:
186 return ERR_PTR(rc);
187}
188
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199
200int ecryptfs_interpose(struct dentry *lower_dentry, struct dentry *dentry,
201 struct super_block *sb, u32 flags)
202{
203 struct inode *lower_inode = lower_dentry->d_inode;
204 struct inode *inode = ecryptfs_get_inode(lower_inode, sb);
205 if (IS_ERR(inode))
206 return PTR_ERR(inode);
207 if (flags & ECRYPTFS_INTERPOSE_FLAG_D_ADD)
208 d_add(dentry, inode);
209 else
210 d_instantiate(dentry, inode);
211 return 0;
212}
213
214enum { ecryptfs_opt_sig, ecryptfs_opt_ecryptfs_sig,
215 ecryptfs_opt_cipher, ecryptfs_opt_ecryptfs_cipher,
216 ecryptfs_opt_ecryptfs_key_bytes,
217 ecryptfs_opt_passthrough, ecryptfs_opt_xattr_metadata,
218 ecryptfs_opt_encrypted_view, ecryptfs_opt_fnek_sig,
219 ecryptfs_opt_fn_cipher, ecryptfs_opt_fn_cipher_key_bytes,
220 ecryptfs_opt_unlink_sigs, ecryptfs_opt_mount_auth_tok_only,
221 ecryptfs_opt_err };
222
223static const match_table_t tokens = {
224 {ecryptfs_opt_sig, "sig=%s"},
225 {ecryptfs_opt_ecryptfs_sig, "ecryptfs_sig=%s"},
226 {ecryptfs_opt_cipher, "cipher=%s"},
227 {ecryptfs_opt_ecryptfs_cipher, "ecryptfs_cipher=%s"},
228 {ecryptfs_opt_ecryptfs_key_bytes, "ecryptfs_key_bytes=%u"},
229 {ecryptfs_opt_passthrough, "ecryptfs_passthrough"},
230 {ecryptfs_opt_xattr_metadata, "ecryptfs_xattr_metadata"},
231 {ecryptfs_opt_encrypted_view, "ecryptfs_encrypted_view"},
232 {ecryptfs_opt_fnek_sig, "ecryptfs_fnek_sig=%s"},
233 {ecryptfs_opt_fn_cipher, "ecryptfs_fn_cipher=%s"},
234 {ecryptfs_opt_fn_cipher_key_bytes, "ecryptfs_fn_key_bytes=%u"},
235 {ecryptfs_opt_unlink_sigs, "ecryptfs_unlink_sigs"},
236 {ecryptfs_opt_mount_auth_tok_only, "ecryptfs_mount_auth_tok_only"},
237 {ecryptfs_opt_err, NULL}
238};
239
240static int ecryptfs_init_global_auth_toks(
241 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
242{
243 struct ecryptfs_global_auth_tok *global_auth_tok;
244 int rc = 0;
245
246 list_for_each_entry(global_auth_tok,
247 &mount_crypt_stat->global_auth_tok_list,
248 mount_crypt_stat_list) {
249 rc = ecryptfs_keyring_auth_tok_for_sig(
250 &global_auth_tok->global_auth_tok_key,
251 &global_auth_tok->global_auth_tok,
252 global_auth_tok->sig);
253 if (rc) {
254 printk(KERN_ERR "Could not find valid key in user "
255 "session keyring for sig specified in mount "
256 "option: [%s]\n", global_auth_tok->sig);
257 global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
258 goto out;
259 } else
260 global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
261 }
262out:
263 return rc;
264}
265
266static void ecryptfs_init_mount_crypt_stat(
267 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
268{
269 memset((void *)mount_crypt_stat, 0,
270 sizeof(struct ecryptfs_mount_crypt_stat));
271 INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list);
272 mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex);
273 mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED;
274}
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294
295static int ecryptfs_parse_options(struct ecryptfs_sb_info *sbi, char *options)
296{
297 char *p;
298 int rc = 0;
299 int sig_set = 0;
300 int cipher_name_set = 0;
301 int fn_cipher_name_set = 0;
302 int cipher_key_bytes;
303 int cipher_key_bytes_set = 0;
304 int fn_cipher_key_bytes;
305 int fn_cipher_key_bytes_set = 0;
306 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
307 &sbi->mount_crypt_stat;
308 substring_t args[MAX_OPT_ARGS];
309 int token;
310 char *sig_src;
311 char *cipher_name_dst;
312 char *cipher_name_src;
313 char *fn_cipher_name_dst;
314 char *fn_cipher_name_src;
315 char *fnek_dst;
316 char *fnek_src;
317 char *cipher_key_bytes_src;
318 char *fn_cipher_key_bytes_src;
319
320 if (!options) {
321 rc = -EINVAL;
322 goto out;
323 }
324 ecryptfs_init_mount_crypt_stat(mount_crypt_stat);
325 while ((p = strsep(&options, ",")) != NULL) {
326 if (!*p)
327 continue;
328 token = match_token(p, tokens, args);
329 switch (token) {
330 case ecryptfs_opt_sig:
331 case ecryptfs_opt_ecryptfs_sig:
332 sig_src = args[0].from;
333 rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
334 sig_src, 0);
335 if (rc) {
336 printk(KERN_ERR "Error attempting to register "
337 "global sig; rc = [%d]\n", rc);
338 goto out;
339 }
340 sig_set = 1;
341 break;
342 case ecryptfs_opt_cipher:
343 case ecryptfs_opt_ecryptfs_cipher:
344 cipher_name_src = args[0].from;
345 cipher_name_dst =
346 mount_crypt_stat->
347 global_default_cipher_name;
348 strncpy(cipher_name_dst, cipher_name_src,
349 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
350 cipher_name_dst[ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
351 cipher_name_set = 1;
352 break;
353 case ecryptfs_opt_ecryptfs_key_bytes:
354 cipher_key_bytes_src = args[0].from;
355 cipher_key_bytes =
356 (int)simple_strtol(cipher_key_bytes_src,
357 &cipher_key_bytes_src, 0);
358 mount_crypt_stat->global_default_cipher_key_size =
359 cipher_key_bytes;
360 cipher_key_bytes_set = 1;
361 break;
362 case ecryptfs_opt_passthrough:
363 mount_crypt_stat->flags |=
364 ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED;
365 break;
366 case ecryptfs_opt_xattr_metadata:
367 mount_crypt_stat->flags |=
368 ECRYPTFS_XATTR_METADATA_ENABLED;
369 break;
370 case ecryptfs_opt_encrypted_view:
371 mount_crypt_stat->flags |=
372 ECRYPTFS_XATTR_METADATA_ENABLED;
373 mount_crypt_stat->flags |=
374 ECRYPTFS_ENCRYPTED_VIEW_ENABLED;
375 break;
376 case ecryptfs_opt_fnek_sig:
377 fnek_src = args[0].from;
378 fnek_dst =
379 mount_crypt_stat->global_default_fnek_sig;
380 strncpy(fnek_dst, fnek_src, ECRYPTFS_SIG_SIZE_HEX);
381 mount_crypt_stat->global_default_fnek_sig[
382 ECRYPTFS_SIG_SIZE_HEX] = '\0';
383 rc = ecryptfs_add_global_auth_tok(
384 mount_crypt_stat,
385 mount_crypt_stat->global_default_fnek_sig,
386 ECRYPTFS_AUTH_TOK_FNEK);
387 if (rc) {
388 printk(KERN_ERR "Error attempting to register "
389 "global fnek sig [%s]; rc = [%d]\n",
390 mount_crypt_stat->global_default_fnek_sig,
391 rc);
392 goto out;
393 }
394 mount_crypt_stat->flags |=
395 (ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES
396 | ECRYPTFS_GLOBAL_ENCFN_USE_MOUNT_FNEK);
397 break;
398 case ecryptfs_opt_fn_cipher:
399 fn_cipher_name_src = args[0].from;
400 fn_cipher_name_dst =
401 mount_crypt_stat->global_default_fn_cipher_name;
402 strncpy(fn_cipher_name_dst, fn_cipher_name_src,
403 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
404 mount_crypt_stat->global_default_fn_cipher_name[
405 ECRYPTFS_MAX_CIPHER_NAME_SIZE] = '\0';
406 fn_cipher_name_set = 1;
407 break;
408 case ecryptfs_opt_fn_cipher_key_bytes:
409 fn_cipher_key_bytes_src = args[0].from;
410 fn_cipher_key_bytes =
411 (int)simple_strtol(fn_cipher_key_bytes_src,
412 &fn_cipher_key_bytes_src, 0);
413 mount_crypt_stat->global_default_fn_cipher_key_bytes =
414 fn_cipher_key_bytes;
415 fn_cipher_key_bytes_set = 1;
416 break;
417 case ecryptfs_opt_unlink_sigs:
418 mount_crypt_stat->flags |= ECRYPTFS_UNLINK_SIGS;
419 break;
420 case ecryptfs_opt_mount_auth_tok_only:
421 mount_crypt_stat->flags |=
422 ECRYPTFS_GLOBAL_MOUNT_AUTH_TOK_ONLY;
423 break;
424 case ecryptfs_opt_err:
425 default:
426 printk(KERN_WARNING
427 "%s: eCryptfs: unrecognized option [%s]\n",
428 __func__, p);
429 }
430 }
431 if (!sig_set) {
432 rc = -EINVAL;
433 ecryptfs_printk(KERN_ERR, "You must supply at least one valid "
434 "auth tok signature as a mount "
435 "parameter; see the eCryptfs README\n");
436 goto out;
437 }
438 if (!cipher_name_set) {
439 int cipher_name_len = strlen(ECRYPTFS_DEFAULT_CIPHER);
440
441 BUG_ON(cipher_name_len >= ECRYPTFS_MAX_CIPHER_NAME_SIZE);
442 strcpy(mount_crypt_stat->global_default_cipher_name,
443 ECRYPTFS_DEFAULT_CIPHER);
444 }
445 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
446 && !fn_cipher_name_set)
447 strcpy(mount_crypt_stat->global_default_fn_cipher_name,
448 mount_crypt_stat->global_default_cipher_name);
449 if (!cipher_key_bytes_set)
450 mount_crypt_stat->global_default_cipher_key_size = 0;
451 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
452 && !fn_cipher_key_bytes_set)
453 mount_crypt_stat->global_default_fn_cipher_key_bytes =
454 mount_crypt_stat->global_default_cipher_key_size;
455 mutex_lock(&key_tfm_list_mutex);
456 if (!ecryptfs_tfm_exists(mount_crypt_stat->global_default_cipher_name,
457 NULL)) {
458 rc = ecryptfs_add_new_key_tfm(
459 NULL, mount_crypt_stat->global_default_cipher_name,
460 mount_crypt_stat->global_default_cipher_key_size);
461 if (rc) {
462 printk(KERN_ERR "Error attempting to initialize "
463 "cipher with name = [%s] and key size = [%td]; "
464 "rc = [%d]\n",
465 mount_crypt_stat->global_default_cipher_name,
466 mount_crypt_stat->global_default_cipher_key_size,
467 rc);
468 rc = -EINVAL;
469 mutex_unlock(&key_tfm_list_mutex);
470 goto out;
471 }
472 }
473 if ((mount_crypt_stat->flags & ECRYPTFS_GLOBAL_ENCRYPT_FILENAMES)
474 && !ecryptfs_tfm_exists(
475 mount_crypt_stat->global_default_fn_cipher_name, NULL)) {
476 rc = ecryptfs_add_new_key_tfm(
477 NULL, mount_crypt_stat->global_default_fn_cipher_name,
478 mount_crypt_stat->global_default_fn_cipher_key_bytes);
479 if (rc) {
480 printk(KERN_ERR "Error attempting to initialize "
481 "cipher with name = [%s] and key size = [%td]; "
482 "rc = [%d]\n",
483 mount_crypt_stat->global_default_fn_cipher_name,
484 mount_crypt_stat->global_default_fn_cipher_key_bytes,
485 rc);
486 rc = -EINVAL;
487 mutex_unlock(&key_tfm_list_mutex);
488 goto out;
489 }
490 }
491 mutex_unlock(&key_tfm_list_mutex);
492 rc = ecryptfs_init_global_auth_toks(mount_crypt_stat);
493 if (rc)
494 printk(KERN_WARNING "One or more global auth toks could not "
495 "properly register; rc = [%d]\n", rc);
496out:
497 return rc;
498}
499
500struct kmem_cache *ecryptfs_sb_info_cache;
501static struct file_system_type ecryptfs_fs_type;
502
503
504
505
506
507
508
509
510static struct dentry *ecryptfs_mount(struct file_system_type *fs_type, int flags,
511 const char *dev_name, void *raw_data)
512{
513 struct super_block *s;
514 struct ecryptfs_sb_info *sbi;
515 struct ecryptfs_dentry_info *root_info;
516 const char *err = "Getting sb failed";
517 struct inode *inode;
518 struct path path;
519 int rc;
520
521 sbi = kmem_cache_zalloc(ecryptfs_sb_info_cache, GFP_KERNEL);
522 if (!sbi) {
523 rc = -ENOMEM;
524 goto out;
525 }
526
527 rc = ecryptfs_parse_options(sbi, raw_data);
528 if (rc) {
529 err = "Error parsing options";
530 goto out;
531 }
532
533 s = sget(fs_type, NULL, set_anon_super, NULL);
534 if (IS_ERR(s)) {
535 rc = PTR_ERR(s);
536 goto out;
537 }
538
539 s->s_flags = flags;
540 rc = bdi_setup_and_register(&sbi->bdi, "ecryptfs", BDI_CAP_MAP_COPY);
541 if (rc)
542 goto out1;
543
544 ecryptfs_set_superblock_private(s, sbi);
545 s->s_bdi = &sbi->bdi;
546
547
548 sbi = NULL;
549 s->s_op = &ecryptfs_sops;
550 s->s_d_op = &ecryptfs_dops;
551
552 err = "Reading sb failed";
553 rc = kern_path(dev_name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path);
554 if (rc) {
555 ecryptfs_printk(KERN_WARNING, "kern_path() failed\n");
556 goto out1;
557 }
558 if (path.dentry->d_sb->s_type == &ecryptfs_fs_type) {
559 rc = -EINVAL;
560 printk(KERN_ERR "Mount on filesystem of type "
561 "eCryptfs explicitly disallowed due to "
562 "known incompatibilities\n");
563 goto out_free;
564 }
565 ecryptfs_set_superblock_lower(s, path.dentry->d_sb);
566 s->s_maxbytes = path.dentry->d_sb->s_maxbytes;
567 s->s_blocksize = path.dentry->d_sb->s_blocksize;
568 s->s_magic = ECRYPTFS_SUPER_MAGIC;
569
570 inode = ecryptfs_get_inode(path.dentry->d_inode, s);
571 rc = PTR_ERR(inode);
572 if (IS_ERR(inode))
573 goto out_free;
574
575 s->s_root = d_alloc_root(inode);
576 if (!s->s_root) {
577 iput(inode);
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 ecryptfs_set_dentry_lower(s->s_root, path.dentry);
590 ecryptfs_set_dentry_lower_mnt(s->s_root, path.mnt);
591
592 s->s_flags |= MS_ACTIVE;
593 return dget(s->s_root);
594
595out_free:
596 path_put(&path);
597out1:
598 deactivate_locked_super(s);
599out:
600 if (sbi) {
601 ecryptfs_destroy_mount_crypt_stat(&sbi->mount_crypt_stat);
602 kmem_cache_free(ecryptfs_sb_info_cache, sbi);
603 }
604 printk(KERN_ERR "%s; rc = [%d]\n", err, rc);
605 return ERR_PTR(rc);
606}
607
608
609
610
611
612
613
614static void ecryptfs_kill_block_super(struct super_block *sb)
615{
616 struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb);
617 kill_anon_super(sb);
618 if (!sb_info)
619 return;
620 ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat);
621 bdi_destroy(&sb_info->bdi);
622 kmem_cache_free(ecryptfs_sb_info_cache, sb_info);
623}
624
625static struct file_system_type ecryptfs_fs_type = {
626 .owner = THIS_MODULE,
627 .name = "ecryptfs",
628 .mount = ecryptfs_mount,
629 .kill_sb = ecryptfs_kill_block_super,
630 .fs_flags = 0
631};
632
633
634
635
636
637
638static void
639inode_info_init_once(void *vptr)
640{
641 struct ecryptfs_inode_info *ei = (struct ecryptfs_inode_info *)vptr;
642
643 inode_init_once(&ei->vfs_inode);
644}
645
646static struct ecryptfs_cache_info {
647 struct kmem_cache **cache;
648 const char *name;
649 size_t size;
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 .ctor = inode_info_init_once,
672 },
673 {
674 .cache = &ecryptfs_sb_info_cache,
675 .name = "ecryptfs_sb_cache",
676 .size = sizeof(struct ecryptfs_sb_info),
677 },
678 {
679 .cache = &ecryptfs_header_cache_1,
680 .name = "ecryptfs_headers_1",
681 .size = PAGE_CACHE_SIZE,
682 },
683 {
684 .cache = &ecryptfs_header_cache_2,
685 .name = "ecryptfs_headers_2",
686 .size = PAGE_CACHE_SIZE,
687 },
688 {
689 .cache = &ecryptfs_xattr_cache,
690 .name = "ecryptfs_xattr_cache",
691 .size = PAGE_CACHE_SIZE,
692 },
693 {
694 .cache = &ecryptfs_key_record_cache,
695 .name = "ecryptfs_key_record_cache",
696 .size = sizeof(struct ecryptfs_key_record),
697 },
698 {
699 .cache = &ecryptfs_key_sig_cache,
700 .name = "ecryptfs_key_sig_cache",
701 .size = sizeof(struct ecryptfs_key_sig),
702 },
703 {
704 .cache = &ecryptfs_global_auth_tok_cache,
705 .name = "ecryptfs_global_auth_tok_cache",
706 .size = sizeof(struct ecryptfs_global_auth_tok),
707 },
708 {
709 .cache = &ecryptfs_key_tfm_cache,
710 .name = "ecryptfs_key_tfm_cache",
711 .size = sizeof(struct ecryptfs_key_tfm),
712 },
713 {
714 .cache = &ecryptfs_open_req_cache,
715 .name = "ecryptfs_open_req_cache",
716 .size = sizeof(struct ecryptfs_open_req),
717 },
718};
719
720static void ecryptfs_free_kmem_caches(void)
721{
722 int i;
723
724 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
725 struct ecryptfs_cache_info *info;
726
727 info = &ecryptfs_cache_infos[i];
728 if (*(info->cache))
729 kmem_cache_destroy(*(info->cache));
730 }
731}
732
733
734
735
736
737
738static int ecryptfs_init_kmem_caches(void)
739{
740 int i;
741
742 for (i = 0; i < ARRAY_SIZE(ecryptfs_cache_infos); i++) {
743 struct ecryptfs_cache_info *info;
744
745 info = &ecryptfs_cache_infos[i];
746 *(info->cache) = kmem_cache_create(info->name, info->size,
747 0, SLAB_HWCACHE_ALIGN, info->ctor);
748 if (!*(info->cache)) {
749 ecryptfs_free_kmem_caches();
750 ecryptfs_printk(KERN_WARNING, "%s: "
751 "kmem_cache_create failed\n",
752 info->name);
753 return -ENOMEM;
754 }
755 }
756 return 0;
757}
758
759static struct kobject *ecryptfs_kobj;
760
761static ssize_t version_show(struct kobject *kobj,
762 struct kobj_attribute *attr, char *buff)
763{
764 return snprintf(buff, PAGE_SIZE, "%d\n", ECRYPTFS_VERSIONING_MASK);
765}
766
767static struct kobj_attribute version_attr = __ATTR_RO(version);
768
769static struct attribute *attributes[] = {
770 &version_attr.attr,
771 NULL,
772};
773
774static struct attribute_group attr_group = {
775 .attrs = attributes,
776};
777
778static int do_sysfs_registration(void)
779{
780 int rc;
781
782 ecryptfs_kobj = kobject_create_and_add("ecryptfs", fs_kobj);
783 if (!ecryptfs_kobj) {
784 printk(KERN_ERR "Unable to create ecryptfs kset\n");
785 rc = -ENOMEM;
786 goto out;
787 }
788 rc = sysfs_create_group(ecryptfs_kobj, &attr_group);
789 if (rc) {
790 printk(KERN_ERR
791 "Unable to create ecryptfs version attributes\n");
792 kobject_put(ecryptfs_kobj);
793 }
794out:
795 return rc;
796}
797
798static void do_sysfs_unregistration(void)
799{
800 sysfs_remove_group(ecryptfs_kobj, &attr_group);
801 kobject_put(ecryptfs_kobj);
802}
803
804static int __init ecryptfs_init(void)
805{
806 int rc;
807
808 if (ECRYPTFS_DEFAULT_EXTENT_SIZE > PAGE_CACHE_SIZE) {
809 rc = -EINVAL;
810 ecryptfs_printk(KERN_ERR, "The eCryptfs extent size is "
811 "larger than the host's page size, and so "
812 "eCryptfs cannot run on this system. The "
813 "default eCryptfs extent size is [%u] bytes; "
814 "the page size is [%lu] bytes.\n",
815 ECRYPTFS_DEFAULT_EXTENT_SIZE,
816 (unsigned long)PAGE_CACHE_SIZE);
817 goto out;
818 }
819 rc = ecryptfs_init_kmem_caches();
820 if (rc) {
821 printk(KERN_ERR
822 "Failed to allocate one or more kmem_cache objects\n");
823 goto out;
824 }
825 rc = register_filesystem(&ecryptfs_fs_type);
826 if (rc) {
827 printk(KERN_ERR "Failed to register filesystem\n");
828 goto out_free_kmem_caches;
829 }
830 rc = do_sysfs_registration();
831 if (rc) {
832 printk(KERN_ERR "sysfs registration failed\n");
833 goto out_unregister_filesystem;
834 }
835 rc = ecryptfs_init_kthread();
836 if (rc) {
837 printk(KERN_ERR "%s: kthread initialization failed; "
838 "rc = [%d]\n", __func__, rc);
839 goto out_do_sysfs_unregistration;
840 }
841 rc = ecryptfs_init_messaging();
842 if (rc) {
843 printk(KERN_ERR "Failure occured while attempting to "
844 "initialize the communications channel to "
845 "ecryptfsd\n");
846 goto out_destroy_kthread;
847 }
848 rc = ecryptfs_init_crypto();
849 if (rc) {
850 printk(KERN_ERR "Failure whilst attempting to init crypto; "
851 "rc = [%d]\n", rc);
852 goto out_release_messaging;
853 }
854 if (ecryptfs_verbosity > 0)
855 printk(KERN_CRIT "eCryptfs verbosity set to %d. Secret values "
856 "will be written to the syslog!\n", ecryptfs_verbosity);
857
858 goto out;
859out_release_messaging:
860 ecryptfs_release_messaging();
861out_destroy_kthread:
862 ecryptfs_destroy_kthread();
863out_do_sysfs_unregistration:
864 do_sysfs_unregistration();
865out_unregister_filesystem:
866 unregister_filesystem(&ecryptfs_fs_type);
867out_free_kmem_caches:
868 ecryptfs_free_kmem_caches();
869out:
870 return rc;
871}
872
873static void __exit ecryptfs_exit(void)
874{
875 int rc;
876
877 rc = ecryptfs_destroy_crypto();
878 if (rc)
879 printk(KERN_ERR "Failure whilst attempting to destroy crypto; "
880 "rc = [%d]\n", rc);
881 ecryptfs_release_messaging();
882 ecryptfs_destroy_kthread();
883 do_sysfs_unregistration();
884 unregister_filesystem(&ecryptfs_fs_type);
885 ecryptfs_free_kmem_caches();
886}
887
888MODULE_AUTHOR("Michael A. Halcrow <mhalcrow@us.ibm.com>");
889MODULE_DESCRIPTION("eCryptfs");
890
891MODULE_LICENSE("GPL");
892
893module_init(ecryptfs_init)
894module_exit(ecryptfs_exit)
895