2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, version 2.
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
12 * Special thanks to the authors of selinuxfs.
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
19 #include <linux/kernel.h>
20 #include <linux/vmalloc.h>
21 #include <linux/security.h>
22 #include <linux/mutex.h>
23 #include <net/netlabel.h>
24 #include <net/cipso_ipv4.h>
25 #include <linux/seq_file.h>
26 #include <linux/ctype.h>
27 #include <linux/audit.h>
31 * smackfs pseudo filesystem.
36 SMK_LOAD = 3, /* load policy */
37 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
38 SMK_DOI = 5, /* CIPSO DOI */
39 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
40 SMK_AMBIENT = 7, /* internet ambient label */
41 SMK_NLTYPE = 8, /* label scheme to use by default */
42 SMK_ONLYCAP = 9, /* the only "capable" label */
48 static DEFINE_MUTEX(smack_list_lock);
49 static DEFINE_MUTEX(smack_cipso_lock);
50 static DEFINE_MUTEX(smack_ambient_lock);
53 * This is the "ambient" label for network traffic.
54 * If it isn't somehow marked, use this.
55 * It can be reset via smackfs/ambient
57 char *smack_net_ambient = smack_known_floor.smk_known;
60 * This is the default packet marking scheme for network traffic.
61 * It can be reset via smackfs/nltype
63 int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4;
66 * This is the level in a CIPSO header that indicates a
67 * smack label is contained directly in the category set.
68 * It can be reset via smackfs/direct
70 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
73 * Unless a process is running with this label even
74 * having CAP_MAC_OVERRIDE isn't enough to grant
75 * privilege to violate MAC policy. If no label is
76 * designated (the NULL case) capabilities apply to
77 * everyone. It is expected that the hat (^) label
78 * will be used if any label is used.
82 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
83 struct smk_list_entry *smack_list;
85 #define SEQ_READ_FINISHED 1
88 * Values for parsing cipso rules
89 * SMK_DIGITLEN: Length of a digit field in a rule.
90 * SMK_CIPSOMIN: Minimum possible cipso rule length.
91 * SMK_CIPSOMAX: Maximum possible cipso rule length.
93 #define SMK_DIGITLEN 4
94 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
95 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
98 * Values for parsing MAC rules
99 * SMK_ACCESS: Maximum possible combination of access permissions
100 * SMK_ACCESSLEN: Maximum length for a rule access field
101 * SMK_LOADLEN: Smack rule length
103 #define SMK_ACCESS "rwxa"
104 #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
105 #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
109 * Seq_file read operations for /smack/load
112 static void *load_seq_start(struct seq_file *s, loff_t *pos)
114 if (*pos == SEQ_READ_FINISHED)
120 static void *load_seq_next(struct seq_file *s, void *v, loff_t *pos)
122 struct smk_list_entry *skp = ((struct smk_list_entry *) v)->smk_next;
125 *pos = SEQ_READ_FINISHED;
130 static int load_seq_show(struct seq_file *s, void *v)
132 struct smk_list_entry *slp = (struct smk_list_entry *) v;
133 struct smack_rule *srp = &slp->smk_rule;
135 seq_printf(s, "%s %s", (char *)srp->smk_subject,
136 (char *)srp->smk_object);
140 if (srp->smk_access & MAY_READ)
142 if (srp->smk_access & MAY_WRITE)
144 if (srp->smk_access & MAY_EXEC)
146 if (srp->smk_access & MAY_APPEND)
148 if (srp->smk_access == 0)
156 static void load_seq_stop(struct seq_file *s, void *v)
161 static struct seq_operations load_seq_ops = {
162 .start = load_seq_start,
163 .next = load_seq_next,
164 .show = load_seq_show,
165 .stop = load_seq_stop,
169 * smk_open_load - open() for /smack/load
170 * @inode: inode structure representing file
171 * @file: "load" file pointer
173 * For reading, use load_seq_* seq_file reading operations.
175 static int smk_open_load(struct inode *inode, struct file *file)
177 return seq_open(file, &load_seq_ops);
181 * smk_set_access - add a rule to the rule list
182 * @srp: the new rule to add
184 * Looks through the current subject/object/access list for
185 * the subject/object pair and replaces the access that was
186 * there. If the pair isn't found add it with the specified
189 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
190 * during the allocation of the new pair to add.
192 static int smk_set_access(struct smack_rule *srp)
194 struct smk_list_entry *sp;
195 struct smk_list_entry *newp;
198 mutex_lock(&smack_list_lock);
200 for (sp = smack_list; sp != NULL; sp = sp->smk_next)
201 if (sp->smk_rule.smk_subject == srp->smk_subject &&
202 sp->smk_rule.smk_object == srp->smk_object) {
203 sp->smk_rule.smk_access = srp->smk_access;
208 newp = kzalloc(sizeof(struct smk_list_entry), GFP_KERNEL);
214 newp->smk_rule = *srp;
215 newp->smk_next = smack_list;
220 mutex_unlock(&smack_list_lock);
226 * smk_write_load - write() for /smack/load
227 * @filp: file pointer, not actually used
228 * @buf: where to get the data from
230 * @ppos: where to start - must be 0
232 * Get one smack access rule from above.
233 * The format is exactly:
234 * char subject[SMK_LABELLEN]
235 * char object[SMK_LABELLEN]
236 * char access[SMK_ACCESSLEN]
238 * writes must be SMK_LABELLEN+SMK_LABELLEN+SMK_ACCESSLEN bytes.
240 static ssize_t smk_write_load(struct file *file, const char __user *buf,
241 size_t count, loff_t *ppos)
243 struct smack_rule rule;
248 * Must have privilege.
250 * Enough data must be present.
252 if (!capable(CAP_MAC_ADMIN))
256 if (count != SMK_LOADLEN)
259 data = kzalloc(count, GFP_KERNEL);
263 if (copy_from_user(data, buf, count) != 0) {
268 rule.smk_subject = smk_import(data, 0);
269 if (rule.smk_subject == NULL)
272 rule.smk_object = smk_import(data + SMK_LABELLEN, 0);
273 if (rule.smk_object == NULL)
278 switch (data[SMK_LABELLEN + SMK_LABELLEN]) {
283 rule.smk_access |= MAY_READ;
289 switch (data[SMK_LABELLEN + SMK_LABELLEN + 1]) {
294 rule.smk_access |= MAY_WRITE;
300 switch (data[SMK_LABELLEN + SMK_LABELLEN + 2]) {
305 rule.smk_access |= MAY_EXEC;
311 switch (data[SMK_LABELLEN + SMK_LABELLEN + 3]) {
316 rule.smk_access |= MAY_READ;
322 rc = smk_set_access(&rule);
332 static const struct file_operations smk_load_ops = {
333 .open = smk_open_load,
336 .write = smk_write_load,
337 .release = seq_release,
341 * smk_cipso_doi - initialize the CIPSO domain
343 static void smk_cipso_doi(void)
346 struct cipso_v4_doi *doip;
347 struct netlbl_audit audit_info;
349 audit_info.loginuid = audit_get_loginuid(current);
350 audit_info.sessionid = audit_get_sessionid(current);
351 audit_info.secid = smack_to_secid(current_security());
353 rc = netlbl_cfg_map_del(NULL, &audit_info);
355 printk(KERN_WARNING "%s:%d remove rc = %d\n",
356 __func__, __LINE__, rc);
358 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
360 panic("smack: Failed to initialize cipso DOI.\n");
361 doip->map.std = NULL;
362 doip->doi = smk_cipso_doi_value;
363 doip->type = CIPSO_V4_MAP_PASS;
364 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
365 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
366 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
368 rc = netlbl_cfg_cipsov4_add_map(doip, NULL, &audit_info);
370 printk(KERN_WARNING "%s:%d add rc = %d\n",
371 __func__, __LINE__, rc);
377 * smk_unlbl_ambient - initialize the unlabeled domain
379 static void smk_unlbl_ambient(char *oldambient)
382 struct netlbl_audit audit_info;
384 audit_info.loginuid = audit_get_loginuid(current);
385 audit_info.sessionid = audit_get_sessionid(current);
386 audit_info.secid = smack_to_secid(current_security());
388 if (oldambient != NULL) {
389 rc = netlbl_cfg_map_del(oldambient, &audit_info);
391 printk(KERN_WARNING "%s:%d remove rc = %d\n",
392 __func__, __LINE__, rc);
395 rc = netlbl_cfg_unlbl_add_map(smack_net_ambient, &audit_info);
397 printk(KERN_WARNING "%s:%d add rc = %d\n",
398 __func__, __LINE__, rc);
402 * Seq_file read operations for /smack/cipso
405 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
407 if (*pos == SEQ_READ_FINISHED)
413 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
415 struct smack_known *skp = ((struct smack_known *) v)->smk_next;
418 * Omit labels with no associated cipso value
420 while (skp != NULL && !skp->smk_cipso)
424 *pos = SEQ_READ_FINISHED;
430 * Print cipso labels in format:
431 * label level[/cat[,cat]]
433 static int cipso_seq_show(struct seq_file *s, void *v)
435 struct smack_known *skp = (struct smack_known *) v;
436 struct smack_cipso *scp = skp->smk_cipso;
446 seq_printf(s, "%s %3d", (char *)&skp->smk_known, scp->smk_level);
448 cbp = scp->smk_catset;
449 for (i = 0; i < SMK_LABELLEN; i++)
450 for (m = 0x80; m != 0; m >>= 1) {
452 seq_printf(s, "%c%d", sep, cat);
463 static void cipso_seq_stop(struct seq_file *s, void *v)
468 static struct seq_operations cipso_seq_ops = {
469 .start = cipso_seq_start,
470 .stop = cipso_seq_stop,
471 .next = cipso_seq_next,
472 .show = cipso_seq_show,
476 * smk_open_cipso - open() for /smack/cipso
477 * @inode: inode structure representing file
478 * @file: "cipso" file pointer
480 * Connect our cipso_seq_* operations with /smack/cipso
483 static int smk_open_cipso(struct inode *inode, struct file *file)
485 return seq_open(file, &cipso_seq_ops);
489 * smk_write_cipso - write() for /smack/cipso
490 * @filp: file pointer, not actually used
491 * @buf: where to get the data from
493 * @ppos: where to start
495 * Accepts only one cipso rule per write call.
496 * Returns number of bytes written or error code, as appropriate
498 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
499 size_t count, loff_t *ppos)
501 struct smack_known *skp;
502 struct smack_cipso *scp = NULL;
503 char mapcatset[SMK_LABELLEN];
507 ssize_t rc = -EINVAL;
514 * Must have privilege.
516 * Enough data must be present.
518 if (!capable(CAP_MAC_ADMIN))
522 if (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)
525 data = kzalloc(count + 1, GFP_KERNEL);
529 if (copy_from_user(data, buf, count) != 0) {
537 * Only allow one writer at a time. Writes should be
538 * quite rare and small in any case.
540 mutex_lock(&smack_cipso_lock);
542 skp = smk_import_entry(rule, 0);
546 rule += SMK_LABELLEN;;
547 ret = sscanf(rule, "%d", &maplevel);
548 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
551 rule += SMK_DIGITLEN;
552 ret = sscanf(rule, "%d", &catlen);
553 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
556 if (count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
559 memset(mapcatset, 0, sizeof(mapcatset));
561 for (i = 0; i < catlen; i++) {
562 rule += SMK_DIGITLEN;
563 ret = sscanf(rule, "%d", &cat);
564 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
567 smack_catset_bit(cat, mapcatset);
570 if (skp->smk_cipso == NULL) {
571 scp = kzalloc(sizeof(struct smack_cipso), GFP_KERNEL);
578 spin_lock_bh(&skp->smk_cipsolock);
581 scp = skp->smk_cipso;
583 skp->smk_cipso = scp;
585 scp->smk_level = maplevel;
586 memcpy(scp->smk_catset, mapcatset, sizeof(mapcatset));
588 spin_unlock_bh(&skp->smk_cipsolock);
592 mutex_unlock(&smack_cipso_lock);
598 static const struct file_operations smk_cipso_ops = {
599 .open = smk_open_cipso,
602 .write = smk_write_cipso,
603 .release = seq_release,
607 * smk_read_doi - read() for /smack/doi
608 * @filp: file pointer, not actually used
609 * @buf: where to put the result
610 * @count: maximum to send along
611 * @ppos: where to start
613 * Returns number of bytes read or error code, as appropriate
615 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
616 size_t count, loff_t *ppos)
624 sprintf(temp, "%d", smk_cipso_doi_value);
625 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
631 * smk_write_doi - write() for /smack/doi
632 * @filp: file pointer, not actually used
633 * @buf: where to get the data from
635 * @ppos: where to start
637 * Returns number of bytes written or error code, as appropriate
639 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
640 size_t count, loff_t *ppos)
645 if (!capable(CAP_MAC_ADMIN))
648 if (count >= sizeof(temp) || count == 0)
651 if (copy_from_user(temp, buf, count) != 0)
656 if (sscanf(temp, "%d", &i) != 1)
659 smk_cipso_doi_value = i;
666 static const struct file_operations smk_doi_ops = {
667 .read = smk_read_doi,
668 .write = smk_write_doi,
672 * smk_read_direct - read() for /smack/direct
673 * @filp: file pointer, not actually used
674 * @buf: where to put the result
675 * @count: maximum to send along
676 * @ppos: where to start
678 * Returns number of bytes read or error code, as appropriate
680 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
681 size_t count, loff_t *ppos)
689 sprintf(temp, "%d", smack_cipso_direct);
690 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
696 * smk_write_direct - write() for /smack/direct
697 * @filp: file pointer, not actually used
698 * @buf: where to get the data from
700 * @ppos: where to start
702 * Returns number of bytes written or error code, as appropriate
704 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
705 size_t count, loff_t *ppos)
710 if (!capable(CAP_MAC_ADMIN))
713 if (count >= sizeof(temp) || count == 0)
716 if (copy_from_user(temp, buf, count) != 0)
721 if (sscanf(temp, "%d", &i) != 1)
724 smack_cipso_direct = i;
729 static const struct file_operations smk_direct_ops = {
730 .read = smk_read_direct,
731 .write = smk_write_direct,
735 * smk_read_ambient - read() for /smack/ambient
736 * @filp: file pointer, not actually used
737 * @buf: where to put the result
738 * @cn: maximum to send along
739 * @ppos: where to start
741 * Returns number of bytes read or error code, as appropriate
743 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
744 size_t cn, loff_t *ppos)
752 * Being careful to avoid a problem in the case where
753 * smack_net_ambient gets changed in midstream.
755 mutex_lock(&smack_ambient_lock);
757 asize = strlen(smack_net_ambient) + 1;
760 rc = simple_read_from_buffer(buf, cn, ppos,
761 smack_net_ambient, asize);
765 mutex_unlock(&smack_ambient_lock);
771 * smk_write_ambient - write() for /smack/ambient
772 * @filp: file pointer, not actually used
773 * @buf: where to get the data from
775 * @ppos: where to start
777 * Returns number of bytes written or error code, as appropriate
779 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
780 size_t count, loff_t *ppos)
782 char in[SMK_LABELLEN];
786 if (!capable(CAP_MAC_ADMIN))
789 if (count >= SMK_LABELLEN)
792 if (copy_from_user(in, buf, count) != 0)
795 smack = smk_import(in, count);
799 mutex_lock(&smack_ambient_lock);
801 oldambient = smack_net_ambient;
802 smack_net_ambient = smack;
803 smk_unlbl_ambient(oldambient);
805 mutex_unlock(&smack_ambient_lock);
810 static const struct file_operations smk_ambient_ops = {
811 .read = smk_read_ambient,
812 .write = smk_write_ambient,
816 * smk_read_onlycap - read() for /smack/onlycap
817 * @filp: file pointer, not actually used
818 * @buf: where to put the result
819 * @cn: maximum to send along
820 * @ppos: where to start
822 * Returns number of bytes read or error code, as appropriate
824 static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
825 size_t cn, loff_t *ppos)
828 ssize_t rc = -EINVAL;
834 if (smack_onlycap != NULL)
835 smack = smack_onlycap;
837 asize = strlen(smack) + 1;
840 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
846 * smk_write_onlycap - write() for /smack/onlycap
847 * @filp: file pointer, not actually used
848 * @buf: where to get the data from
850 * @ppos: where to start
852 * Returns number of bytes written or error code, as appropriate
854 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
855 size_t count, loff_t *ppos)
857 char in[SMK_LABELLEN];
858 char *sp = current->cred->security;
860 if (!capable(CAP_MAC_ADMIN))
864 * This can be done using smk_access() but is done
865 * explicitly for clarity. The smk_access() implementation
866 * would use smk_access(smack_onlycap, MAY_WRITE)
868 if (smack_onlycap != NULL && smack_onlycap != sp)
871 if (count >= SMK_LABELLEN)
874 if (copy_from_user(in, buf, count) != 0)
878 * Should the null string be passed in unset the onlycap value.
879 * This seems like something to be careful with as usually
880 * smk_import only expects to return NULL for errors. It
881 * is usually the case that a nullstring or "\n" would be
882 * bad to pass to smk_import but in fact this is useful here.
884 smack_onlycap = smk_import(in, count);
889 static const struct file_operations smk_onlycap_ops = {
890 .read = smk_read_onlycap,
891 .write = smk_write_onlycap,
894 struct option_names {
900 static struct option_names netlbl_choices[] = {
901 { NETLBL_NLTYPE_RIPSO,
902 NETLBL_NLTYPE_RIPSO_NAME, "ripso" },
903 { NETLBL_NLTYPE_CIPSOV4,
904 NETLBL_NLTYPE_CIPSOV4_NAME, "cipsov4" },
905 { NETLBL_NLTYPE_CIPSOV4,
906 NETLBL_NLTYPE_CIPSOV4_NAME, "cipso" },
907 { NETLBL_NLTYPE_CIPSOV6,
908 NETLBL_NLTYPE_CIPSOV6_NAME, "cipsov6" },
909 { NETLBL_NLTYPE_UNLABELED,
910 NETLBL_NLTYPE_UNLABELED_NAME, "unlabeled" },
914 * smk_read_nltype - read() for /smack/nltype
915 * @filp: file pointer, not actually used
916 * @buf: where to put the result
917 * @count: maximum to send along
918 * @ppos: where to start
920 * Returns number of bytes read or error code, as appropriate
922 static ssize_t smk_read_nltype(struct file *filp, char __user *buf,
923 size_t count, loff_t *ppos)
929 if (count < SMK_LABELLEN)
935 sprintf(bound, "unknown");
937 for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
938 if (smack_net_nltype == netlbl_choices[i].o_number) {
939 sprintf(bound, "%s", netlbl_choices[i].o_name);
943 rc = simple_read_from_buffer(buf, count, ppos, bound, strlen(bound));
949 * smk_write_nltype - write() for /smack/nltype
950 * @filp: file pointer, not actually used
951 * @buf: where to get the data from
953 * @ppos: where to start
955 * Returns number of bytes written or error code, as appropriate
957 static ssize_t smk_write_nltype(struct file *file, const char __user *buf,
958 size_t count, loff_t *ppos)
964 if (!capable(CAP_MAC_ADMIN))
970 if (copy_from_user(bound, buf, count) != 0)
974 cp = strchr(bound, ' ');
977 cp = strchr(bound, '\n');
981 for (i = 0; i < ARRAY_SIZE(netlbl_choices); i++)
982 if (strcmp(bound, netlbl_choices[i].o_name) == 0 ||
983 strcmp(bound, netlbl_choices[i].o_alias) == 0) {
984 smack_net_nltype = netlbl_choices[i].o_number;
988 * Not a valid choice.
993 static const struct file_operations smk_nltype_ops = {
994 .read = smk_read_nltype,
995 .write = smk_write_nltype,
999 * smk_fill_super - fill the /smackfs superblock
1000 * @sb: the empty superblock
1004 * Fill in the well known entries for /smack
1006 * Returns 0 on success, an error code on failure
1008 static int smk_fill_super(struct super_block *sb, void *data, int silent)
1011 struct inode *root_inode;
1013 static struct tree_descr smack_files[] = {
1015 {"load", &smk_load_ops, S_IRUGO|S_IWUSR},
1017 {"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
1019 {"doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
1021 {"direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
1023 {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
1025 {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR},
1027 {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
1031 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
1033 printk(KERN_ERR "%s failed %d while creating inodes\n",
1038 root_inode = sb->s_root->d_inode;
1039 root_inode->i_security = new_inode_smack(smack_known_floor.smk_known);
1045 * smk_get_sb - get the smackfs superblock
1046 * @fs_type: passed along without comment
1047 * @flags: passed along without comment
1048 * @dev_name: passed along without comment
1049 * @data: passed along without comment
1050 * @mnt: passed along without comment
1052 * Just passes everything along.
1054 * Returns what the lower level code does.
1056 static int smk_get_sb(struct file_system_type *fs_type,
1057 int flags, const char *dev_name, void *data,
1058 struct vfsmount *mnt)
1060 return get_sb_single(fs_type, flags, data, smk_fill_super, mnt);
1063 static struct file_system_type smk_fs_type = {
1065 .get_sb = smk_get_sb,
1066 .kill_sb = kill_litter_super,
1069 static struct vfsmount *smackfs_mount;
1072 * init_smk_fs - get the smackfs superblock
1074 * register the smackfs
1076 * Do not register smackfs if Smack wasn't enabled
1077 * on boot. We can not put this method normally under the
1078 * smack_init() code path since the security subsystem get
1079 * initialized before the vfs caches.
1081 * Returns true if we were not chosen on boot or if
1082 * we were chosen and filesystem registration succeeded.
1084 static int __init init_smk_fs(void)
1088 if (!security_module_enable(&smack_ops))
1091 err = register_filesystem(&smk_fs_type);
1093 smackfs_mount = kern_mount(&smk_fs_type);
1094 if (IS_ERR(smackfs_mount)) {
1095 printk(KERN_ERR "smackfs: could not mount!\n");
1096 err = PTR_ERR(smackfs_mount);
1097 smackfs_mount = NULL;
1102 smk_unlbl_ambient(NULL);
1107 __initcall(init_smk_fs);