1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
6 * Casey Schaufler <casey@schaufler-ca.com>
7 * Ahmed S. Darwish <darwish.07@gmail.com>
9 * Special thanks to the authors of selinuxfs.
11 * Karl MacMillan <kmacmillan@tresys.com>
12 * James Morris <jmorris@redhat.com>
15 #include <linux/kernel.h>
16 #include <linux/vmalloc.h>
17 #include <linux/security.h>
18 #include <linux/mutex.h>
19 #include <linux/slab.h>
20 #include <net/net_namespace.h>
21 #include <net/cipso_ipv4.h>
22 #include <linux/seq_file.h>
23 #include <linux/ctype.h>
24 #include <linux/audit.h>
25 #include <linux/magic.h>
26 #include <linux/fs_context.h>
29 #define BEBITS (sizeof(__be32) * 8)
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_NET4ADDR = 8, /* single label hosts */
42 SMK_ONLYCAP = 9, /* the only "capable" label */
43 SMK_LOGGING = 10, /* logging */
44 SMK_LOAD_SELF = 11, /* task specific rules */
45 SMK_ACCESSES = 12, /* access policy */
46 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
47 SMK_LOAD2 = 14, /* load policy with long labels */
48 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
49 SMK_ACCESS2 = 16, /* make an access check with long labels */
50 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
51 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
52 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
53 SMK_SYSLOG = 20, /* change syslog label) */
54 SMK_PTRACE = 21, /* set ptrace rule */
55 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
56 SMK_UNCONFINED = 22, /* define an unconfined label */
58 #if IS_ENABLED(CONFIG_IPV6)
59 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
60 #endif /* CONFIG_IPV6 */
61 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
67 static DEFINE_MUTEX(smack_cipso_lock);
68 static DEFINE_MUTEX(smack_ambient_lock);
69 static DEFINE_MUTEX(smk_net4addr_lock);
70 #if IS_ENABLED(CONFIG_IPV6)
71 static DEFINE_MUTEX(smk_net6addr_lock);
72 #endif /* CONFIG_IPV6 */
75 * This is the "ambient" label for network traffic.
76 * If it isn't somehow marked, use this.
77 * It can be reset via smackfs/ambient
79 struct smack_known *smack_net_ambient;
82 * This is the level in a CIPSO header that indicates a
83 * smack label is contained directly in the category set.
84 * It can be reset via smackfs/direct
86 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
89 * This is the level in a CIPSO header that indicates a
90 * secid is contained directly in the category set.
91 * It can be reset via smackfs/mapped
93 int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
95 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
97 * Allow one label to be unconfined. This is for
98 * debugging and application bring-up purposes only.
99 * It is bad and wrong, but everyone seems to expect
102 struct smack_known *smack_unconfined;
106 * If this value is set restrict syslog use to the label specified.
107 * It can be reset via smackfs/syslog
109 struct smack_known *smack_syslog_label;
112 * Ptrace current rule
113 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
114 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
116 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
118 int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
121 * Certain IP addresses may be designated as single label hosts.
122 * Packets are sent there unlabeled, but only from tasks that
123 * can write to the specified label.
126 LIST_HEAD(smk_net4addr_list);
127 #if IS_ENABLED(CONFIG_IPV6)
128 LIST_HEAD(smk_net6addr_list);
129 #endif /* CONFIG_IPV6 */
132 * Rule lists are maintained for each label.
134 struct smack_parsed_rule {
135 struct smack_known *smk_subject;
136 struct smack_known *smk_object;
141 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
144 * Values for parsing cipso rules
145 * SMK_DIGITLEN: Length of a digit field in a rule.
146 * SMK_CIPSOMIN: Minimum possible cipso rule length.
147 * SMK_CIPSOMAX: Maximum possible cipso rule length.
149 #define SMK_DIGITLEN 4
150 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
151 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
154 * Values for parsing MAC rules
155 * SMK_ACCESS: Maximum possible combination of access permissions
156 * SMK_ACCESSLEN: Maximum length for a rule access field
157 * SMK_LOADLEN: Smack rule length
159 #define SMK_OACCESS "rwxa"
160 #define SMK_ACCESS "rwxatl"
161 #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
162 #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
163 #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
164 #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
167 * Stricly for CIPSO level manipulation.
168 * Set the category bit number in a smack label sized buffer.
170 static inline void smack_catset_bit(unsigned int cat, char *catsetp)
172 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
175 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
179 * smk_netlabel_audit_set - fill a netlbl_audit struct
180 * @nap: structure to fill
182 static void smk_netlabel_audit_set(struct netlbl_audit *nap)
184 struct smack_known *skp = smk_of_current();
186 nap->loginuid = audit_get_loginuid(current);
187 nap->sessionid = audit_get_sessionid(current);
188 nap->secid = skp->smk_secid;
192 * Value for parsing single label host rules
195 #define SMK_NETLBLADDRMIN 9
198 * smk_set_access - add a rule to the rule list or replace an old rule
199 * @srp: the rule to add or replace
200 * @rule_list: the list of rules
201 * @rule_lock: the rule list lock
203 * Looks through the current subject/object/access list for
204 * the subject/object pair and replaces the access that was
205 * there. If the pair isn't found add it with the specified
208 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
209 * during the allocation of the new pair to add.
211 static int smk_set_access(struct smack_parsed_rule *srp,
212 struct list_head *rule_list,
213 struct mutex *rule_lock)
215 struct smack_rule *sp;
219 mutex_lock(rule_lock);
222 * Because the object label is less likely to match
223 * than the subject label check it first
225 list_for_each_entry_rcu(sp, rule_list, list) {
226 if (sp->smk_object == srp->smk_object &&
227 sp->smk_subject == srp->smk_subject) {
229 sp->smk_access |= srp->smk_access1;
230 sp->smk_access &= ~srp->smk_access2;
236 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
242 sp->smk_subject = srp->smk_subject;
243 sp->smk_object = srp->smk_object;
244 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
246 list_add_rcu(&sp->list, rule_list);
250 mutex_unlock(rule_lock);
255 * smk_perm_from_str - parse smack accesses from a text string
256 * @string: a text string that contains a Smack accesses code
258 * Returns an integer with respective bits set for specified accesses.
260 static int smk_perm_from_str(const char *string)
265 for (cp = string; ; cp++)
287 perm |= MAY_TRANSMUTE;
303 * smk_fill_rule - Fill Smack rule from strings
304 * @subject: subject label string
305 * @object: object label string
306 * @access1: access string
307 * @access2: string with permissions to be removed
309 * @import: if non-zero, import labels
310 * @len: label length limit
312 * Returns 0 on success, appropriate error code on failure.
314 static int smk_fill_rule(const char *subject, const char *object,
315 const char *access1, const char *access2,
316 struct smack_parsed_rule *rule, int import,
320 struct smack_known *skp;
323 rule->smk_subject = smk_import_entry(subject, len);
324 if (IS_ERR(rule->smk_subject))
325 return PTR_ERR(rule->smk_subject);
327 rule->smk_object = smk_import_entry(object, len);
328 if (IS_ERR(rule->smk_object))
329 return PTR_ERR(rule->smk_object);
331 cp = smk_parse_smack(subject, len);
334 skp = smk_find_entry(cp);
338 rule->smk_subject = skp;
340 cp = smk_parse_smack(object, len);
343 skp = smk_find_entry(cp);
347 rule->smk_object = skp;
350 rule->smk_access1 = smk_perm_from_str(access1);
352 rule->smk_access2 = smk_perm_from_str(access2);
354 rule->smk_access2 = ~rule->smk_access1;
360 * smk_parse_rule - parse Smack rule from load string
361 * @data: string to be parsed whose size is SMK_LOADLEN
363 * @import: if non-zero, import labels
365 * Returns 0 on success, -1 on errors.
367 static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
372 rc = smk_fill_rule(data, data + SMK_LABELLEN,
373 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
374 import, SMK_LABELLEN);
379 * smk_parse_long_rule - parse Smack rule from rule string
380 * @data: string to be parsed, null terminated
381 * @rule: Will be filled with Smack parsed rule
382 * @import: if non-zero, import labels
383 * @tokens: numer of substrings expected in data
385 * Returns number of processed bytes on success, -ERRNO on failure.
387 static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
388 int import, int tokens)
396 * Parsing the rule in-place, filling all white-spaces with '\0'
398 for (i = 0; i < tokens; ++i) {
399 while (isspace(data[cnt]))
402 if (data[cnt] == '\0')
403 /* Unexpected end of data */
408 while (data[cnt] && !isspace(data[cnt]))
411 while (isspace(data[cnt]))
417 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
418 return rc == 0 ? cnt : rc;
421 #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
422 #define SMK_LONG_FMT 1 /* Variable long label format */
423 #define SMK_CHANGE_FMT 2 /* Rule modification format */
425 * smk_write_rules_list - write() for any /smack rule file
426 * @file: file pointer, not actually used
427 * @buf: where to get the data from
429 * @ppos: where to start - must be 0
430 * @rule_list: the list of rules to write to
431 * @rule_lock: lock for the rule list
432 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
434 * Get one smack access rule from above.
435 * The format for SMK_LONG_FMT is:
436 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
437 * The format for SMK_FIXED24_FMT is exactly:
438 * "subject object rwxat"
439 * The format for SMK_CHANGE_FMT is:
440 * "subject<whitespace>object<whitespace>
441 * acc_enable<whitespace>acc_disable[<whitespace>...]"
443 static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
444 size_t count, loff_t *ppos,
445 struct list_head *rule_list,
446 struct mutex *rule_lock, int format)
448 struct smack_parsed_rule rule;
457 * Enough data must be present.
462 if (format == SMK_FIXED24_FMT) {
464 * Minor hack for backward compatibility
466 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
469 if (count >= PAGE_SIZE) {
470 count = PAGE_SIZE - 1;
475 data = memdup_user_nul(buf, count);
477 return PTR_ERR(data);
480 * In case of parsing only part of user buf,
481 * avoid having partial rule at the data buffer
484 while (count > 0 && (data[count - 1] != '\n'))
493 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
494 while (cnt < count) {
495 if (format == SMK_FIXED24_FMT) {
496 rc = smk_parse_rule(data, &rule, 1);
501 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
511 if (rule_list == NULL)
512 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
513 &rule.smk_subject->smk_rules_lock);
515 rc = smk_set_access(&rule, rule_list, rule_lock);
528 * Core logic for smackfs seq list operations.
531 static void *smk_seq_start(struct seq_file *s, loff_t *pos,
532 struct list_head *head)
534 struct list_head *list;
538 for (list = rcu_dereference(list_next_rcu(head));
540 list = rcu_dereference(list_next_rcu(list))) {
548 static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
549 struct list_head *head)
551 struct list_head *list = v;
554 list = rcu_dereference(list_next_rcu(list));
556 return (list == head) ? NULL : list;
559 static void smk_seq_stop(struct seq_file *s, void *v)
564 static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
567 * Don't show any rules with label names too long for
568 * interface file (/smack/load or /smack/load2)
569 * because you should expect to be able to write
570 * anything you read back.
572 if (strlen(srp->smk_subject->smk_known) >= max ||
573 strlen(srp->smk_object->smk_known) >= max)
576 if (srp->smk_access == 0)
579 seq_printf(s, "%s %s",
580 srp->smk_subject->smk_known,
581 srp->smk_object->smk_known);
585 if (srp->smk_access & MAY_READ)
587 if (srp->smk_access & MAY_WRITE)
589 if (srp->smk_access & MAY_EXEC)
591 if (srp->smk_access & MAY_APPEND)
593 if (srp->smk_access & MAY_TRANSMUTE)
595 if (srp->smk_access & MAY_LOCK)
597 if (srp->smk_access & MAY_BRINGUP)
604 * Seq_file read operations for /smack/load
607 static void *load2_seq_start(struct seq_file *s, loff_t *pos)
609 return smk_seq_start(s, pos, &smack_known_list);
612 static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
614 return smk_seq_next(s, v, pos, &smack_known_list);
617 static int load_seq_show(struct seq_file *s, void *v)
619 struct list_head *list = v;
620 struct smack_rule *srp;
621 struct smack_known *skp =
622 list_entry_rcu(list, struct smack_known, list);
624 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
625 smk_rule_show(s, srp, SMK_LABELLEN);
630 static const struct seq_operations load_seq_ops = {
631 .start = load2_seq_start,
632 .next = load2_seq_next,
633 .show = load_seq_show,
634 .stop = smk_seq_stop,
638 * smk_open_load - open() for /smack/load
639 * @inode: inode structure representing file
640 * @file: "load" file pointer
642 * For reading, use load_seq_* seq_file reading operations.
644 static int smk_open_load(struct inode *inode, struct file *file)
646 return seq_open(file, &load_seq_ops);
650 * smk_write_load - write() for /smack/load
651 * @file: file pointer, not actually used
652 * @buf: where to get the data from
654 * @ppos: where to start - must be 0
657 static ssize_t smk_write_load(struct file *file, const char __user *buf,
658 size_t count, loff_t *ppos)
661 * Must have privilege.
663 * Enough data must be present.
665 if (!smack_privileged(CAP_MAC_ADMIN))
668 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
672 static const struct file_operations smk_load_ops = {
673 .open = smk_open_load,
676 .write = smk_write_load,
677 .release = seq_release,
681 * smk_cipso_doi - initialize the CIPSO domain
683 static void smk_cipso_doi(void)
686 struct cipso_v4_doi *doip;
687 struct netlbl_audit nai;
689 smk_netlabel_audit_set(&nai);
691 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
693 printk(KERN_WARNING "%s:%d remove rc = %d\n",
694 __func__, __LINE__, rc);
696 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
698 panic("smack: Failed to initialize cipso DOI.\n");
699 doip->map.std = NULL;
700 doip->doi = smk_cipso_doi_value;
701 doip->type = CIPSO_V4_MAP_PASS;
702 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
703 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
704 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
706 rc = netlbl_cfg_cipsov4_add(doip, &nai);
708 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
709 __func__, __LINE__, rc);
713 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
715 printk(KERN_WARNING "%s:%d map add rc = %d\n",
716 __func__, __LINE__, rc);
723 * smk_unlbl_ambient - initialize the unlabeled domain
724 * @oldambient: previous domain string
726 static void smk_unlbl_ambient(char *oldambient)
729 struct netlbl_audit nai;
731 smk_netlabel_audit_set(&nai);
733 if (oldambient != NULL) {
734 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
736 printk(KERN_WARNING "%s:%d remove rc = %d\n",
737 __func__, __LINE__, rc);
739 if (smack_net_ambient == NULL)
740 smack_net_ambient = &smack_known_floor;
742 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
745 printk(KERN_WARNING "%s:%d add rc = %d\n",
746 __func__, __LINE__, rc);
750 * Seq_file read operations for /smack/cipso
753 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
755 return smk_seq_start(s, pos, &smack_known_list);
758 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
760 return smk_seq_next(s, v, pos, &smack_known_list);
764 * Print cipso labels in format:
765 * label level[/cat[,cat]]
767 static int cipso_seq_show(struct seq_file *s, void *v)
769 struct list_head *list = v;
770 struct smack_known *skp =
771 list_entry_rcu(list, struct smack_known, list);
772 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
777 * Don't show a label that could not have been set using
778 * /smack/cipso. This is in support of the notion that
779 * anything read from /smack/cipso ought to be writeable
782 * /smack/cipso2 should be used instead.
784 if (strlen(skp->smk_known) >= SMK_LABELLEN)
787 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
789 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
790 i = netlbl_catmap_walk(cmp, i + 1)) {
791 seq_printf(s, "%c%d", sep, i);
800 static const struct seq_operations cipso_seq_ops = {
801 .start = cipso_seq_start,
802 .next = cipso_seq_next,
803 .show = cipso_seq_show,
804 .stop = smk_seq_stop,
808 * smk_open_cipso - open() for /smack/cipso
809 * @inode: inode structure representing file
810 * @file: "cipso" file pointer
812 * Connect our cipso_seq_* operations with /smack/cipso
815 static int smk_open_cipso(struct inode *inode, struct file *file)
817 return seq_open(file, &cipso_seq_ops);
821 * smk_set_cipso - do the work for write() for cipso and cipso2
822 * @file: file pointer, not actually used
823 * @buf: where to get the data from
825 * @ppos: where to start
826 * @format: /smack/cipso or /smack/cipso2
828 * Accepts only one cipso rule per write call.
829 * Returns number of bytes written or error code, as appropriate
831 static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
832 size_t count, loff_t *ppos, int format)
834 struct smack_known *skp;
835 struct netlbl_lsm_secattr ncats;
836 char mapcatset[SMK_CIPSOLEN];
840 ssize_t rc = -EINVAL;
847 * Must have privilege.
849 * Enough data must be present.
851 if (!smack_privileged(CAP_MAC_ADMIN))
855 if (format == SMK_FIXED24_FMT &&
856 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
859 data = memdup_user_nul(buf, count);
861 return PTR_ERR(data);
865 * Only allow one writer at a time. Writes should be
866 * quite rare and small in any case.
868 mutex_lock(&smack_cipso_lock);
870 skp = smk_import_entry(rule, 0);
876 if (format == SMK_FIXED24_FMT)
877 rule += SMK_LABELLEN;
879 rule += strlen(skp->smk_known) + 1;
881 if (rule > data + count) {
886 ret = sscanf(rule, "%d", &maplevel);
887 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
890 rule += SMK_DIGITLEN;
891 if (rule > data + count) {
896 ret = sscanf(rule, "%d", &catlen);
897 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
900 if (format == SMK_FIXED24_FMT &&
901 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
904 memset(mapcatset, 0, sizeof(mapcatset));
906 for (i = 0; i < catlen; i++) {
907 rule += SMK_DIGITLEN;
908 if (rule > data + count) {
912 ret = sscanf(rule, "%u", &cat);
913 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
916 smack_catset_bit(cat, mapcatset);
919 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
921 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
922 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
923 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
926 * This mapping may have been cached, so clear the cache.
928 netlbl_cache_invalidate();
932 mutex_unlock(&smack_cipso_lock);
938 * smk_write_cipso - write() for /smack/cipso
939 * @file: file pointer, not actually used
940 * @buf: where to get the data from
942 * @ppos: where to start
944 * Accepts only one cipso rule per write call.
945 * Returns number of bytes written or error code, as appropriate
947 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
948 size_t count, loff_t *ppos)
950 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
953 static const struct file_operations smk_cipso_ops = {
954 .open = smk_open_cipso,
957 .write = smk_write_cipso,
958 .release = seq_release,
962 * Seq_file read operations for /smack/cipso2
966 * Print cipso labels in format:
967 * label level[/cat[,cat]]
969 static int cipso2_seq_show(struct seq_file *s, void *v)
971 struct list_head *list = v;
972 struct smack_known *skp =
973 list_entry_rcu(list, struct smack_known, list);
974 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
978 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
980 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
981 i = netlbl_catmap_walk(cmp, i + 1)) {
982 seq_printf(s, "%c%d", sep, i);
991 static const struct seq_operations cipso2_seq_ops = {
992 .start = cipso_seq_start,
993 .next = cipso_seq_next,
994 .show = cipso2_seq_show,
995 .stop = smk_seq_stop,
999 * smk_open_cipso2 - open() for /smack/cipso2
1000 * @inode: inode structure representing file
1001 * @file: "cipso2" file pointer
1003 * Connect our cipso_seq_* operations with /smack/cipso2
1006 static int smk_open_cipso2(struct inode *inode, struct file *file)
1008 return seq_open(file, &cipso2_seq_ops);
1012 * smk_write_cipso2 - write() for /smack/cipso2
1013 * @file: file pointer, not actually used
1014 * @buf: where to get the data from
1015 * @count: bytes sent
1016 * @ppos: where to start
1018 * Accepts only one cipso rule per write call.
1019 * Returns number of bytes written or error code, as appropriate
1021 static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1022 size_t count, loff_t *ppos)
1024 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1027 static const struct file_operations smk_cipso2_ops = {
1028 .open = smk_open_cipso2,
1030 .llseek = seq_lseek,
1031 .write = smk_write_cipso2,
1032 .release = seq_release,
1036 * Seq_file read operations for /smack/netlabel
1039 static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1041 return smk_seq_start(s, pos, &smk_net4addr_list);
1044 static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1046 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1050 * Print host/label pairs
1052 static int net4addr_seq_show(struct seq_file *s, void *v)
1054 struct list_head *list = v;
1055 struct smk_net4addr *skp =
1056 list_entry_rcu(list, struct smk_net4addr, list);
1057 char *kp = SMACK_CIPSO_OPTION;
1059 if (skp->smk_label != NULL)
1060 kp = skp->smk_label->smk_known;
1061 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1062 skp->smk_masks, kp);
1067 static const struct seq_operations net4addr_seq_ops = {
1068 .start = net4addr_seq_start,
1069 .next = net4addr_seq_next,
1070 .show = net4addr_seq_show,
1071 .stop = smk_seq_stop,
1075 * smk_open_net4addr - open() for /smack/netlabel
1076 * @inode: inode structure representing file
1077 * @file: "netlabel" file pointer
1079 * Connect our net4addr_seq_* operations with /smack/netlabel
1082 static int smk_open_net4addr(struct inode *inode, struct file *file)
1084 return seq_open(file, &net4addr_seq_ops);
1088 * smk_net4addr_insert
1089 * @new : netlabel to insert
1091 * This helper insert netlabel in the smack_net4addrs list
1092 * sorted by netmask length (longest to smallest)
1093 * locked by &smk_net4addr_lock in smk_write_net4addr
1096 static void smk_net4addr_insert(struct smk_net4addr *new)
1098 struct smk_net4addr *m;
1099 struct smk_net4addr *m_next;
1101 if (list_empty(&smk_net4addr_list)) {
1102 list_add_rcu(&new->list, &smk_net4addr_list);
1106 m = list_entry_rcu(smk_net4addr_list.next,
1107 struct smk_net4addr, list);
1109 /* the comparison '>' is a bit hacky, but works */
1110 if (new->smk_masks > m->smk_masks) {
1111 list_add_rcu(&new->list, &smk_net4addr_list);
1115 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1116 if (list_is_last(&m->list, &smk_net4addr_list)) {
1117 list_add_rcu(&new->list, &m->list);
1120 m_next = list_entry_rcu(m->list.next,
1121 struct smk_net4addr, list);
1122 if (new->smk_masks > m_next->smk_masks) {
1123 list_add_rcu(&new->list, &m->list);
1131 * smk_write_net4addr - write() for /smack/netlabel
1132 * @file: file pointer, not actually used
1133 * @buf: where to get the data from
1134 * @count: bytes sent
1135 * @ppos: where to start
1137 * Accepts only one net4addr per write call.
1138 * Returns number of bytes written or error code, as appropriate
1140 static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1141 size_t count, loff_t *ppos)
1143 struct smk_net4addr *snp;
1144 struct sockaddr_in newname;
1146 struct smack_known *skp = NULL;
1148 char *host = (char *)&newname.sin_addr.s_addr;
1150 struct netlbl_audit audit_info;
1151 struct in_addr mask;
1155 u32 mask_bits = (1<<31);
1160 * Must have privilege.
1161 * No partial writes.
1162 * Enough data must be present.
1163 * "<addr/mask, as a.b.c.d/e><space><label>"
1164 * "<addr, as a.b.c.d><space><label>"
1166 if (!smack_privileged(CAP_MAC_ADMIN))
1170 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1173 data = memdup_user_nul(buf, count);
1175 return PTR_ERR(data);
1177 smack = kzalloc(count + 1, GFP_KERNEL);
1178 if (smack == NULL) {
1183 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1184 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1186 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1187 &host[0], &host[1], &host[2], &host[3], smack);
1195 if (masks > BEBITS) {
1201 * If smack begins with '-', it is an option, don't import it
1203 if (smack[0] != '-') {
1204 skp = smk_import_entry(smack, 0);
1211 * Only the -CIPSO option is supported for IPv4
1213 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1219 for (m = masks, temp_mask = 0; m > 0; m--) {
1220 temp_mask |= mask_bits;
1223 mask.s_addr = cpu_to_be32(temp_mask);
1225 newname.sin_addr.s_addr &= mask.s_addr;
1227 * Only allow one writer at a time. Writes should be
1228 * quite rare and small in any case.
1230 mutex_lock(&smk_net4addr_lock);
1232 nsa = newname.sin_addr.s_addr;
1233 /* try to find if the prefix is already in the list */
1235 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1236 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1241 smk_netlabel_audit_set(&audit_info);
1244 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1249 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1250 snp->smk_mask.s_addr = mask.s_addr;
1251 snp->smk_label = skp;
1252 snp->smk_masks = masks;
1253 smk_net4addr_insert(snp);
1257 * Delete the unlabeled entry, only if the previous label
1258 * wasn't the special CIPSO option
1260 if (snp->smk_label != NULL)
1261 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1262 &snp->smk_host, &snp->smk_mask,
1263 PF_INET, &audit_info);
1266 snp->smk_label = skp;
1270 * Now tell netlabel about the single label nature of
1271 * this host so that incoming packets get labeled.
1272 * but only if we didn't get the special CIPSO option
1274 if (rc == 0 && skp != NULL)
1275 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1276 &snp->smk_host, &snp->smk_mask, PF_INET,
1277 snp->smk_label->smk_secid, &audit_info);
1282 mutex_unlock(&smk_net4addr_lock);
1292 static const struct file_operations smk_net4addr_ops = {
1293 .open = smk_open_net4addr,
1295 .llseek = seq_lseek,
1296 .write = smk_write_net4addr,
1297 .release = seq_release,
1300 #if IS_ENABLED(CONFIG_IPV6)
1302 * Seq_file read operations for /smack/netlabel6
1305 static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1307 return smk_seq_start(s, pos, &smk_net6addr_list);
1310 static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1312 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1316 * Print host/label pairs
1318 static int net6addr_seq_show(struct seq_file *s, void *v)
1320 struct list_head *list = v;
1321 struct smk_net6addr *skp =
1322 list_entry(list, struct smk_net6addr, list);
1324 if (skp->smk_label != NULL)
1325 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1326 skp->smk_label->smk_known);
1331 static const struct seq_operations net6addr_seq_ops = {
1332 .start = net6addr_seq_start,
1333 .next = net6addr_seq_next,
1334 .show = net6addr_seq_show,
1335 .stop = smk_seq_stop,
1339 * smk_open_net6addr - open() for /smack/netlabel
1340 * @inode: inode structure representing file
1341 * @file: "netlabel" file pointer
1343 * Connect our net6addr_seq_* operations with /smack/netlabel
1346 static int smk_open_net6addr(struct inode *inode, struct file *file)
1348 return seq_open(file, &net6addr_seq_ops);
1352 * smk_net6addr_insert
1353 * @new : entry to insert
1355 * This inserts an entry in the smack_net6addrs list
1356 * sorted by netmask length (longest to smallest)
1357 * locked by &smk_net6addr_lock in smk_write_net6addr
1360 static void smk_net6addr_insert(struct smk_net6addr *new)
1362 struct smk_net6addr *m_next;
1363 struct smk_net6addr *m;
1365 if (list_empty(&smk_net6addr_list)) {
1366 list_add_rcu(&new->list, &smk_net6addr_list);
1370 m = list_entry_rcu(smk_net6addr_list.next,
1371 struct smk_net6addr, list);
1373 if (new->smk_masks > m->smk_masks) {
1374 list_add_rcu(&new->list, &smk_net6addr_list);
1378 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1379 if (list_is_last(&m->list, &smk_net6addr_list)) {
1380 list_add_rcu(&new->list, &m->list);
1383 m_next = list_entry_rcu(m->list.next,
1384 struct smk_net6addr, list);
1385 if (new->smk_masks > m_next->smk_masks) {
1386 list_add_rcu(&new->list, &m->list);
1394 * smk_write_net6addr - write() for /smack/netlabel
1395 * @file: file pointer, not actually used
1396 * @buf: where to get the data from
1397 * @count: bytes sent
1398 * @ppos: where to start
1400 * Accepts only one net6addr per write call.
1401 * Returns number of bytes written or error code, as appropriate
1403 static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1404 size_t count, loff_t *ppos)
1406 struct smk_net6addr *snp;
1407 struct in6_addr newname;
1408 struct in6_addr fullmask;
1409 struct smack_known *skp = NULL;
1415 unsigned int scanned[8];
1417 unsigned int mask = 128;
1420 * Must have privilege.
1421 * No partial writes.
1422 * Enough data must be present.
1423 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1424 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1426 if (!smack_privileged(CAP_MAC_ADMIN))
1430 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1433 data = memdup_user_nul(buf, count);
1435 return PTR_ERR(data);
1437 smack = kzalloc(count + 1, GFP_KERNEL);
1438 if (smack == NULL) {
1443 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1444 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1445 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1448 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1449 &scanned[0], &scanned[1], &scanned[2],
1450 &scanned[3], &scanned[4], &scanned[5],
1451 &scanned[6], &scanned[7], smack);
1461 for (i = 0; i < 8; i++) {
1462 if (scanned[i] > 0xffff) {
1466 newname.s6_addr16[i] = htons(scanned[i]);
1470 * If smack begins with '-', it is an option, don't import it
1472 if (smack[0] != '-') {
1473 skp = smk_import_entry(smack, 0);
1480 * Only -DELETE is supported for IPv6
1482 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1488 for (i = 0, m = mask; i < 8; i++) {
1490 fullmask.s6_addr16[i] = 0xffff;
1493 fullmask.s6_addr16[i] = (1 << m) - 1;
1496 fullmask.s6_addr16[i] = 0;
1497 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1501 * Only allow one writer at a time. Writes should be
1502 * quite rare and small in any case.
1504 mutex_lock(&smk_net6addr_lock);
1506 * Try to find the prefix in the list
1508 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1509 if (mask != snp->smk_masks)
1511 for (found = 1, i = 0; i < 8; i++) {
1512 if (newname.s6_addr16[i] !=
1513 snp->smk_host.s6_addr16[i]) {
1522 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1526 snp->smk_host = newname;
1527 snp->smk_mask = fullmask;
1528 snp->smk_masks = mask;
1529 snp->smk_label = skp;
1530 smk_net6addr_insert(snp);
1533 snp->smk_label = skp;
1539 mutex_unlock(&smk_net6addr_lock);
1549 static const struct file_operations smk_net6addr_ops = {
1550 .open = smk_open_net6addr,
1552 .llseek = seq_lseek,
1553 .write = smk_write_net6addr,
1554 .release = seq_release,
1556 #endif /* CONFIG_IPV6 */
1559 * smk_read_doi - read() for /smack/doi
1560 * @filp: file pointer, not actually used
1561 * @buf: where to put the result
1562 * @count: maximum to send along
1563 * @ppos: where to start
1565 * Returns number of bytes read or error code, as appropriate
1567 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1568 size_t count, loff_t *ppos)
1576 sprintf(temp, "%d", smk_cipso_doi_value);
1577 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1583 * smk_write_doi - write() for /smack/doi
1584 * @file: file pointer, not actually used
1585 * @buf: where to get the data from
1586 * @count: bytes sent
1587 * @ppos: where to start
1589 * Returns number of bytes written or error code, as appropriate
1591 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1592 size_t count, loff_t *ppos)
1597 if (!smack_privileged(CAP_MAC_ADMIN))
1600 if (count >= sizeof(temp) || count == 0)
1603 if (copy_from_user(temp, buf, count) != 0)
1608 if (sscanf(temp, "%d", &i) != 1)
1611 smk_cipso_doi_value = i;
1618 static const struct file_operations smk_doi_ops = {
1619 .read = smk_read_doi,
1620 .write = smk_write_doi,
1621 .llseek = default_llseek,
1625 * smk_read_direct - read() for /smack/direct
1626 * @filp: file pointer, not actually used
1627 * @buf: where to put the result
1628 * @count: maximum to send along
1629 * @ppos: where to start
1631 * Returns number of bytes read or error code, as appropriate
1633 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1634 size_t count, loff_t *ppos)
1642 sprintf(temp, "%d", smack_cipso_direct);
1643 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1649 * smk_write_direct - write() for /smack/direct
1650 * @file: file pointer, not actually used
1651 * @buf: where to get the data from
1652 * @count: bytes sent
1653 * @ppos: where to start
1655 * Returns number of bytes written or error code, as appropriate
1657 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1658 size_t count, loff_t *ppos)
1660 struct smack_known *skp;
1664 if (!smack_privileged(CAP_MAC_ADMIN))
1667 if (count >= sizeof(temp) || count == 0)
1670 if (copy_from_user(temp, buf, count) != 0)
1675 if (sscanf(temp, "%d", &i) != 1)
1679 * Don't do anything if the value hasn't actually changed.
1680 * If it is changing reset the level on entries that were
1681 * set up to be direct when they were created.
1683 if (smack_cipso_direct != i) {
1684 mutex_lock(&smack_known_lock);
1685 list_for_each_entry_rcu(skp, &smack_known_list, list)
1686 if (skp->smk_netlabel.attr.mls.lvl ==
1688 skp->smk_netlabel.attr.mls.lvl = i;
1689 smack_cipso_direct = i;
1690 mutex_unlock(&smack_known_lock);
1696 static const struct file_operations smk_direct_ops = {
1697 .read = smk_read_direct,
1698 .write = smk_write_direct,
1699 .llseek = default_llseek,
1703 * smk_read_mapped - read() for /smack/mapped
1704 * @filp: file pointer, not actually used
1705 * @buf: where to put the result
1706 * @count: maximum to send along
1707 * @ppos: where to start
1709 * Returns number of bytes read or error code, as appropriate
1711 static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1712 size_t count, loff_t *ppos)
1720 sprintf(temp, "%d", smack_cipso_mapped);
1721 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1727 * smk_write_mapped - write() for /smack/mapped
1728 * @file: file pointer, not actually used
1729 * @buf: where to get the data from
1730 * @count: bytes sent
1731 * @ppos: where to start
1733 * Returns number of bytes written or error code, as appropriate
1735 static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1736 size_t count, loff_t *ppos)
1738 struct smack_known *skp;
1742 if (!smack_privileged(CAP_MAC_ADMIN))
1745 if (count >= sizeof(temp) || count == 0)
1748 if (copy_from_user(temp, buf, count) != 0)
1753 if (sscanf(temp, "%d", &i) != 1)
1757 * Don't do anything if the value hasn't actually changed.
1758 * If it is changing reset the level on entries that were
1759 * set up to be mapped when they were created.
1761 if (smack_cipso_mapped != i) {
1762 mutex_lock(&smack_known_lock);
1763 list_for_each_entry_rcu(skp, &smack_known_list, list)
1764 if (skp->smk_netlabel.attr.mls.lvl ==
1766 skp->smk_netlabel.attr.mls.lvl = i;
1767 smack_cipso_mapped = i;
1768 mutex_unlock(&smack_known_lock);
1774 static const struct file_operations smk_mapped_ops = {
1775 .read = smk_read_mapped,
1776 .write = smk_write_mapped,
1777 .llseek = default_llseek,
1781 * smk_read_ambient - read() for /smack/ambient
1782 * @filp: file pointer, not actually used
1783 * @buf: where to put the result
1784 * @cn: maximum to send along
1785 * @ppos: where to start
1787 * Returns number of bytes read or error code, as appropriate
1789 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1790 size_t cn, loff_t *ppos)
1798 * Being careful to avoid a problem in the case where
1799 * smack_net_ambient gets changed in midstream.
1801 mutex_lock(&smack_ambient_lock);
1803 asize = strlen(smack_net_ambient->smk_known) + 1;
1806 rc = simple_read_from_buffer(buf, cn, ppos,
1807 smack_net_ambient->smk_known,
1812 mutex_unlock(&smack_ambient_lock);
1818 * smk_write_ambient - write() for /smack/ambient
1819 * @file: file pointer, not actually used
1820 * @buf: where to get the data from
1821 * @count: bytes sent
1822 * @ppos: where to start
1824 * Returns number of bytes written or error code, as appropriate
1826 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1827 size_t count, loff_t *ppos)
1829 struct smack_known *skp;
1834 if (!smack_privileged(CAP_MAC_ADMIN))
1837 /* Enough data must be present */
1838 if (count == 0 || count > PAGE_SIZE)
1841 data = memdup_user_nul(buf, count);
1843 return PTR_ERR(data);
1845 skp = smk_import_entry(data, count);
1851 mutex_lock(&smack_ambient_lock);
1853 oldambient = smack_net_ambient->smk_known;
1854 smack_net_ambient = skp;
1855 smk_unlbl_ambient(oldambient);
1857 mutex_unlock(&smack_ambient_lock);
1864 static const struct file_operations smk_ambient_ops = {
1865 .read = smk_read_ambient,
1866 .write = smk_write_ambient,
1867 .llseek = default_llseek,
1871 * Seq_file operations for /smack/onlycap
1873 static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1875 return smk_seq_start(s, pos, &smack_onlycap_list);
1878 static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1880 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1883 static int onlycap_seq_show(struct seq_file *s, void *v)
1885 struct list_head *list = v;
1886 struct smack_known_list_elem *sklep =
1887 list_entry_rcu(list, struct smack_known_list_elem, list);
1889 seq_puts(s, sklep->smk_label->smk_known);
1895 static const struct seq_operations onlycap_seq_ops = {
1896 .start = onlycap_seq_start,
1897 .next = onlycap_seq_next,
1898 .show = onlycap_seq_show,
1899 .stop = smk_seq_stop,
1902 static int smk_open_onlycap(struct inode *inode, struct file *file)
1904 return seq_open(file, &onlycap_seq_ops);
1908 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1909 * The caller must hold appropriate mutex to prevent concurrent modifications
1910 * to the public list.
1911 * Private list is assumed to be not accessible to other threads yet.
1913 * @public: public list
1914 * @private: private list
1916 static void smk_list_swap_rcu(struct list_head *public,
1917 struct list_head *private)
1919 struct list_head *first, *last;
1921 if (list_empty(public)) {
1922 list_splice_init_rcu(private, public, synchronize_rcu);
1924 /* Remember public list before replacing it */
1925 first = public->next;
1926 last = public->prev;
1928 /* Publish private list in place of public in RCU-safe way */
1929 private->prev->next = public;
1930 private->next->prev = public;
1931 rcu_assign_pointer(public->next, private->next);
1932 public->prev = private->prev;
1936 /* When all readers are done with the old public list,
1937 * attach it in place of private */
1938 private->next = first;
1939 private->prev = last;
1940 first->prev = private;
1941 last->next = private;
1946 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1948 * @data: the string to parse
1949 * @list: destination list
1951 * Returns zero on success or error code, as appropriate
1953 static int smk_parse_label_list(char *data, struct list_head *list)
1956 struct smack_known *skp;
1957 struct smack_known_list_elem *sklep;
1959 while ((tok = strsep(&data, " ")) != NULL) {
1963 skp = smk_import_entry(tok, 0);
1965 return PTR_ERR(skp);
1967 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1971 sklep->smk_label = skp;
1972 list_add(&sklep->list, list);
1979 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1980 * @list: header pointer of the list to destroy
1982 void smk_destroy_label_list(struct list_head *list)
1984 struct smack_known_list_elem *sklep;
1985 struct smack_known_list_elem *sklep2;
1987 list_for_each_entry_safe(sklep, sklep2, list, list)
1990 INIT_LIST_HEAD(list);
1994 * smk_write_onlycap - write() for smackfs/onlycap
1995 * @file: file pointer, not actually used
1996 * @buf: where to get the data from
1997 * @count: bytes sent
1998 * @ppos: where to start
2000 * Returns number of bytes written or error code, as appropriate
2002 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2003 size_t count, loff_t *ppos)
2006 LIST_HEAD(list_tmp);
2009 if (!smack_privileged(CAP_MAC_ADMIN))
2012 if (count > PAGE_SIZE)
2015 data = memdup_user_nul(buf, count);
2017 return PTR_ERR(data);
2019 rc = smk_parse_label_list(data, &list_tmp);
2023 * Clear the smack_onlycap on invalid label errors. This means
2024 * that we can pass a null string to unset the onlycap value.
2026 * Importing will also reject a label beginning with '-',
2027 * so "-usecapabilities" will also work.
2029 * But do so only on invalid label, not on system errors.
2030 * The invalid label must be first to count as clearing attempt.
2032 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2033 mutex_lock(&smack_onlycap_lock);
2034 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2035 mutex_unlock(&smack_onlycap_lock);
2039 smk_destroy_label_list(&list_tmp);
2044 static const struct file_operations smk_onlycap_ops = {
2045 .open = smk_open_onlycap,
2047 .write = smk_write_onlycap,
2048 .llseek = seq_lseek,
2049 .release = seq_release,
2052 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2054 * smk_read_unconfined - read() for smackfs/unconfined
2055 * @filp: file pointer, not actually used
2056 * @buf: where to put the result
2057 * @cn: maximum to send along
2058 * @ppos: where to start
2060 * Returns number of bytes read or error code, as appropriate
2062 static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2063 size_t cn, loff_t *ppos)
2066 ssize_t rc = -EINVAL;
2072 if (smack_unconfined != NULL)
2073 smack = smack_unconfined->smk_known;
2075 asize = strlen(smack) + 1;
2078 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2084 * smk_write_unconfined - write() for smackfs/unconfined
2085 * @file: file pointer, not actually used
2086 * @buf: where to get the data from
2087 * @count: bytes sent
2088 * @ppos: where to start
2090 * Returns number of bytes written or error code, as appropriate
2092 static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2093 size_t count, loff_t *ppos)
2096 struct smack_known *skp;
2099 if (!smack_privileged(CAP_MAC_ADMIN))
2102 if (count > PAGE_SIZE)
2105 data = memdup_user_nul(buf, count);
2107 return PTR_ERR(data);
2110 * Clear the smack_unconfined on invalid label errors. This means
2111 * that we can pass a null string to unset the unconfined value.
2113 * Importing will also reject a label beginning with '-',
2114 * so "-confine" will also work.
2116 * But do so only on invalid label, not on system errors.
2118 skp = smk_import_entry(data, count);
2119 if (PTR_ERR(skp) == -EINVAL)
2121 else if (IS_ERR(skp)) {
2126 smack_unconfined = skp;
2133 static const struct file_operations smk_unconfined_ops = {
2134 .read = smk_read_unconfined,
2135 .write = smk_write_unconfined,
2136 .llseek = default_llseek,
2138 #endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2141 * smk_read_logging - read() for /smack/logging
2142 * @filp: file pointer, not actually used
2143 * @buf: where to put the result
2144 * @count: maximum to send along
2145 * @ppos: where to start
2147 * Returns number of bytes read or error code, as appropriate
2149 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2150 size_t count, loff_t *ppos)
2158 sprintf(temp, "%d\n", log_policy);
2159 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2164 * smk_write_logging - write() for /smack/logging
2165 * @file: file pointer, not actually used
2166 * @buf: where to get the data from
2167 * @count: bytes sent
2168 * @ppos: where to start
2170 * Returns number of bytes written or error code, as appropriate
2172 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2173 size_t count, loff_t *ppos)
2178 if (!smack_privileged(CAP_MAC_ADMIN))
2181 if (count >= sizeof(temp) || count == 0)
2184 if (copy_from_user(temp, buf, count) != 0)
2189 if (sscanf(temp, "%d", &i) != 1)
2199 static const struct file_operations smk_logging_ops = {
2200 .read = smk_read_logging,
2201 .write = smk_write_logging,
2202 .llseek = default_llseek,
2206 * Seq_file read operations for /smack/load-self
2209 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2211 struct task_smack *tsp = smack_cred(current_cred());
2213 return smk_seq_start(s, pos, &tsp->smk_rules);
2216 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2218 struct task_smack *tsp = smack_cred(current_cred());
2220 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2223 static int load_self_seq_show(struct seq_file *s, void *v)
2225 struct list_head *list = v;
2226 struct smack_rule *srp =
2227 list_entry_rcu(list, struct smack_rule, list);
2229 smk_rule_show(s, srp, SMK_LABELLEN);
2234 static const struct seq_operations load_self_seq_ops = {
2235 .start = load_self_seq_start,
2236 .next = load_self_seq_next,
2237 .show = load_self_seq_show,
2238 .stop = smk_seq_stop,
2243 * smk_open_load_self - open() for /smack/load-self2
2244 * @inode: inode structure representing file
2245 * @file: "load" file pointer
2247 * For reading, use load_seq_* seq_file reading operations.
2249 static int smk_open_load_self(struct inode *inode, struct file *file)
2251 return seq_open(file, &load_self_seq_ops);
2255 * smk_write_load_self - write() for /smack/load-self
2256 * @file: file pointer, not actually used
2257 * @buf: where to get the data from
2258 * @count: bytes sent
2259 * @ppos: where to start - must be 0
2262 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2263 size_t count, loff_t *ppos)
2265 struct task_smack *tsp = smack_cred(current_cred());
2267 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2268 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2271 static const struct file_operations smk_load_self_ops = {
2272 .open = smk_open_load_self,
2274 .llseek = seq_lseek,
2275 .write = smk_write_load_self,
2276 .release = seq_release,
2280 * smk_user_access - handle access check transaction
2281 * @file: file pointer
2282 * @buf: data from user space
2283 * @count: bytes sent
2284 * @ppos: where to start - must be 0
2285 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
2287 static ssize_t smk_user_access(struct file *file, const char __user *buf,
2288 size_t count, loff_t *ppos, int format)
2290 struct smack_parsed_rule rule;
2294 data = simple_transaction_get(file, buf, count);
2296 return PTR_ERR(data);
2298 if (format == SMK_FIXED24_FMT) {
2299 if (count < SMK_LOADLEN)
2301 res = smk_parse_rule(data, &rule, 0);
2304 * simple_transaction_get() returns null-terminated data
2306 res = smk_parse_long_rule(data, &rule, 0, 3);
2310 res = smk_access(rule.smk_subject, rule.smk_object,
2311 rule.smk_access1, NULL);
2312 else if (res != -ENOENT)
2316 * smk_access() can return a value > 0 in the "bringup" case.
2318 data[0] = res >= 0 ? '1' : '0';
2321 simple_transaction_set(file, 2);
2323 if (format == SMK_FIXED24_FMT)
2329 * smk_write_access - handle access check transaction
2330 * @file: file pointer
2331 * @buf: data from user space
2332 * @count: bytes sent
2333 * @ppos: where to start - must be 0
2335 static ssize_t smk_write_access(struct file *file, const char __user *buf,
2336 size_t count, loff_t *ppos)
2338 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2341 static const struct file_operations smk_access_ops = {
2342 .write = smk_write_access,
2343 .read = simple_transaction_read,
2344 .release = simple_transaction_release,
2345 .llseek = generic_file_llseek,
2350 * Seq_file read operations for /smack/load2
2353 static int load2_seq_show(struct seq_file *s, void *v)
2355 struct list_head *list = v;
2356 struct smack_rule *srp;
2357 struct smack_known *skp =
2358 list_entry_rcu(list, struct smack_known, list);
2360 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2361 smk_rule_show(s, srp, SMK_LONGLABEL);
2366 static const struct seq_operations load2_seq_ops = {
2367 .start = load2_seq_start,
2368 .next = load2_seq_next,
2369 .show = load2_seq_show,
2370 .stop = smk_seq_stop,
2374 * smk_open_load2 - open() for /smack/load2
2375 * @inode: inode structure representing file
2376 * @file: "load2" file pointer
2378 * For reading, use load2_seq_* seq_file reading operations.
2380 static int smk_open_load2(struct inode *inode, struct file *file)
2382 return seq_open(file, &load2_seq_ops);
2386 * smk_write_load2 - write() for /smack/load2
2387 * @file: file pointer, not actually used
2388 * @buf: where to get the data from
2389 * @count: bytes sent
2390 * @ppos: where to start - must be 0
2393 static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2394 size_t count, loff_t *ppos)
2397 * Must have privilege.
2399 if (!smack_privileged(CAP_MAC_ADMIN))
2402 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2406 static const struct file_operations smk_load2_ops = {
2407 .open = smk_open_load2,
2409 .llseek = seq_lseek,
2410 .write = smk_write_load2,
2411 .release = seq_release,
2415 * Seq_file read operations for /smack/load-self2
2418 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2420 struct task_smack *tsp = smack_cred(current_cred());
2422 return smk_seq_start(s, pos, &tsp->smk_rules);
2425 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2427 struct task_smack *tsp = smack_cred(current_cred());
2429 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2432 static int load_self2_seq_show(struct seq_file *s, void *v)
2434 struct list_head *list = v;
2435 struct smack_rule *srp =
2436 list_entry_rcu(list, struct smack_rule, list);
2438 smk_rule_show(s, srp, SMK_LONGLABEL);
2443 static const struct seq_operations load_self2_seq_ops = {
2444 .start = load_self2_seq_start,
2445 .next = load_self2_seq_next,
2446 .show = load_self2_seq_show,
2447 .stop = smk_seq_stop,
2451 * smk_open_load_self2 - open() for /smack/load-self2
2452 * @inode: inode structure representing file
2453 * @file: "load" file pointer
2455 * For reading, use load_seq_* seq_file reading operations.
2457 static int smk_open_load_self2(struct inode *inode, struct file *file)
2459 return seq_open(file, &load_self2_seq_ops);
2463 * smk_write_load_self2 - write() for /smack/load-self2
2464 * @file: file pointer, not actually used
2465 * @buf: where to get the data from
2466 * @count: bytes sent
2467 * @ppos: where to start - must be 0
2470 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2471 size_t count, loff_t *ppos)
2473 struct task_smack *tsp = smack_cred(current_cred());
2475 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2476 &tsp->smk_rules_lock, SMK_LONG_FMT);
2479 static const struct file_operations smk_load_self2_ops = {
2480 .open = smk_open_load_self2,
2482 .llseek = seq_lseek,
2483 .write = smk_write_load_self2,
2484 .release = seq_release,
2488 * smk_write_access2 - handle access check transaction
2489 * @file: file pointer
2490 * @buf: data from user space
2491 * @count: bytes sent
2492 * @ppos: where to start - must be 0
2494 static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2495 size_t count, loff_t *ppos)
2497 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2500 static const struct file_operations smk_access2_ops = {
2501 .write = smk_write_access2,
2502 .read = simple_transaction_read,
2503 .release = simple_transaction_release,
2504 .llseek = generic_file_llseek,
2508 * smk_write_revoke_subj - write() for /smack/revoke-subject
2509 * @file: file pointer
2510 * @buf: data from user space
2511 * @count: bytes sent
2512 * @ppos: where to start - must be 0
2514 static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2515 size_t count, loff_t *ppos)
2519 struct smack_known *skp;
2520 struct smack_rule *sp;
2521 struct list_head *rule_list;
2522 struct mutex *rule_lock;
2528 if (!smack_privileged(CAP_MAC_ADMIN))
2531 if (count == 0 || count > SMK_LONGLABEL)
2534 data = memdup_user(buf, count);
2536 return PTR_ERR(data);
2538 cp = smk_parse_smack(data, count);
2544 skp = smk_find_entry(cp);
2548 rule_list = &skp->smk_rules;
2549 rule_lock = &skp->smk_rules_lock;
2551 mutex_lock(rule_lock);
2553 list_for_each_entry_rcu(sp, rule_list, list)
2556 mutex_unlock(rule_lock);
2566 static const struct file_operations smk_revoke_subj_ops = {
2567 .write = smk_write_revoke_subj,
2568 .read = simple_transaction_read,
2569 .release = simple_transaction_release,
2570 .llseek = generic_file_llseek,
2574 * smk_init_sysfs - initialize /sys/fs/smackfs
2577 static int smk_init_sysfs(void)
2579 return sysfs_create_mount_point(fs_kobj, "smackfs");
2583 * smk_write_change_rule - write() for /smack/change-rule
2584 * @file: file pointer
2585 * @buf: data from user space
2586 * @count: bytes sent
2587 * @ppos: where to start - must be 0
2589 static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2590 size_t count, loff_t *ppos)
2593 * Must have privilege.
2595 if (!smack_privileged(CAP_MAC_ADMIN))
2598 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2602 static const struct file_operations smk_change_rule_ops = {
2603 .write = smk_write_change_rule,
2604 .read = simple_transaction_read,
2605 .release = simple_transaction_release,
2606 .llseek = generic_file_llseek,
2610 * smk_read_syslog - read() for smackfs/syslog
2611 * @filp: file pointer, not actually used
2612 * @buf: where to put the result
2613 * @cn: maximum to send along
2614 * @ppos: where to start
2616 * Returns number of bytes read or error code, as appropriate
2618 static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2619 size_t cn, loff_t *ppos)
2621 struct smack_known *skp;
2622 ssize_t rc = -EINVAL;
2628 if (smack_syslog_label == NULL)
2629 skp = &smack_known_star;
2631 skp = smack_syslog_label;
2633 asize = strlen(skp->smk_known) + 1;
2636 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2643 * smk_write_syslog - write() for smackfs/syslog
2644 * @file: file pointer, not actually used
2645 * @buf: where to get the data from
2646 * @count: bytes sent
2647 * @ppos: where to start
2649 * Returns number of bytes written or error code, as appropriate
2651 static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2652 size_t count, loff_t *ppos)
2655 struct smack_known *skp;
2658 if (!smack_privileged(CAP_MAC_ADMIN))
2661 /* Enough data must be present */
2662 if (count == 0 || count > PAGE_SIZE)
2665 data = memdup_user_nul(buf, count);
2667 return PTR_ERR(data);
2669 skp = smk_import_entry(data, count);
2673 smack_syslog_label = skp;
2679 static const struct file_operations smk_syslog_ops = {
2680 .read = smk_read_syslog,
2681 .write = smk_write_syslog,
2682 .llseek = default_llseek,
2686 * Seq_file read operations for /smack/relabel-self
2689 static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2691 struct task_smack *tsp = smack_cred(current_cred());
2693 return smk_seq_start(s, pos, &tsp->smk_relabel);
2696 static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2698 struct task_smack *tsp = smack_cred(current_cred());
2700 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2703 static int relabel_self_seq_show(struct seq_file *s, void *v)
2705 struct list_head *list = v;
2706 struct smack_known_list_elem *sklep =
2707 list_entry(list, struct smack_known_list_elem, list);
2709 seq_puts(s, sklep->smk_label->smk_known);
2715 static const struct seq_operations relabel_self_seq_ops = {
2716 .start = relabel_self_seq_start,
2717 .next = relabel_self_seq_next,
2718 .show = relabel_self_seq_show,
2719 .stop = smk_seq_stop,
2723 * smk_open_relabel_self - open() for /smack/relabel-self
2724 * @inode: inode structure representing file
2725 * @file: "relabel-self" file pointer
2727 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2730 static int smk_open_relabel_self(struct inode *inode, struct file *file)
2732 return seq_open(file, &relabel_self_seq_ops);
2736 * smk_write_relabel_self - write() for /smack/relabel-self
2737 * @file: file pointer, not actually used
2738 * @buf: where to get the data from
2739 * @count: bytes sent
2740 * @ppos: where to start - must be 0
2743 static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2744 size_t count, loff_t *ppos)
2748 LIST_HEAD(list_tmp);
2751 * Must have privilege.
2753 if (!smack_privileged(CAP_MAC_ADMIN))
2758 * Enough data must be present.
2762 if (count == 0 || count > PAGE_SIZE)
2765 data = memdup_user_nul(buf, count);
2767 return PTR_ERR(data);
2769 rc = smk_parse_label_list(data, &list_tmp);
2772 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2774 struct task_smack *tsp;
2776 new = prepare_creds();
2781 tsp = smack_cred(new);
2782 smk_destroy_label_list(&tsp->smk_relabel);
2783 list_splice(&list_tmp, &tsp->smk_relabel);
2788 smk_destroy_label_list(&list_tmp);
2792 static const struct file_operations smk_relabel_self_ops = {
2793 .open = smk_open_relabel_self,
2795 .llseek = seq_lseek,
2796 .write = smk_write_relabel_self,
2797 .release = seq_release,
2801 * smk_read_ptrace - read() for /smack/ptrace
2802 * @filp: file pointer, not actually used
2803 * @buf: where to put the result
2804 * @count: maximum to send along
2805 * @ppos: where to start
2807 * Returns number of bytes read or error code, as appropriate
2809 static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2810 size_t count, loff_t *ppos)
2818 sprintf(temp, "%d\n", smack_ptrace_rule);
2819 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2824 * smk_write_ptrace - write() for /smack/ptrace
2825 * @file: file pointer
2826 * @buf: data from user space
2827 * @count: bytes sent
2828 * @ppos: where to start - must be 0
2830 static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2831 size_t count, loff_t *ppos)
2836 if (!smack_privileged(CAP_MAC_ADMIN))
2839 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2842 if (copy_from_user(temp, buf, count) != 0)
2847 if (sscanf(temp, "%d", &i) != 1)
2849 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2851 smack_ptrace_rule = i;
2856 static const struct file_operations smk_ptrace_ops = {
2857 .write = smk_write_ptrace,
2858 .read = smk_read_ptrace,
2859 .llseek = default_llseek,
2863 * smk_fill_super - fill the smackfs superblock
2864 * @sb: the empty superblock
2867 * Fill in the well known entries for the smack filesystem
2869 * Returns 0 on success, an error code on failure
2871 static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2875 static const struct tree_descr smack_files[] = {
2877 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2879 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2881 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2883 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2885 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2887 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2889 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2891 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2893 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2895 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2897 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2899 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2900 [SMK_LOAD_SELF2] = {
2901 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2903 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2905 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2906 [SMK_REVOKE_SUBJ] = {
2907 "revoke-subject", &smk_revoke_subj_ops,
2909 [SMK_CHANGE_RULE] = {
2910 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2912 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2914 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2915 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2916 [SMK_UNCONFINED] = {
2917 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2919 #if IS_ENABLED(CONFIG_IPV6)
2921 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2922 #endif /* CONFIG_IPV6 */
2923 [SMK_RELABEL_SELF] = {
2924 "relabel-self", &smk_relabel_self_ops,
2930 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2932 printk(KERN_ERR "%s failed %d while creating inodes\n",
2941 * smk_get_tree - get the smackfs superblock
2942 * @fc: The mount context, including any options
2944 * Just passes everything along.
2946 * Returns what the lower level code does.
2948 static int smk_get_tree(struct fs_context *fc)
2950 return get_tree_single(fc, smk_fill_super);
2953 static const struct fs_context_operations smk_context_ops = {
2954 .get_tree = smk_get_tree,
2958 * smk_init_fs_context - Initialise a filesystem context for smackfs
2959 * @fc: The blank mount context
2961 static int smk_init_fs_context(struct fs_context *fc)
2963 fc->ops = &smk_context_ops;
2967 static struct file_system_type smk_fs_type = {
2969 .init_fs_context = smk_init_fs_context,
2970 .kill_sb = kill_litter_super,
2973 static struct vfsmount *smackfs_mount;
2976 * init_smk_fs - get the smackfs superblock
2978 * register the smackfs
2980 * Do not register smackfs if Smack wasn't enabled
2981 * on boot. We can not put this method normally under the
2982 * smack_init() code path since the security subsystem get
2983 * initialized before the vfs caches.
2985 * Returns true if we were not chosen on boot or if
2986 * we were chosen and filesystem registration succeeded.
2988 static int __init init_smk_fs(void)
2993 if (smack_enabled == 0)
2996 err = smk_init_sysfs();
2998 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3000 err = register_filesystem(&smk_fs_type);
3002 smackfs_mount = kern_mount(&smk_fs_type);
3003 if (IS_ERR(smackfs_mount)) {
3004 printk(KERN_ERR "smackfs: could not mount!\n");
3005 err = PTR_ERR(smackfs_mount);
3006 smackfs_mount = NULL;
3011 smk_unlbl_ambient(NULL);
3013 rc = smack_populate_secattr(&smack_known_floor);
3014 if (err == 0 && rc < 0)
3016 rc = smack_populate_secattr(&smack_known_hat);
3017 if (err == 0 && rc < 0)
3019 rc = smack_populate_secattr(&smack_known_huh);
3020 if (err == 0 && rc < 0)
3022 rc = smack_populate_secattr(&smack_known_star);
3023 if (err == 0 && rc < 0)
3025 rc = smack_populate_secattr(&smack_known_web);
3026 if (err == 0 && rc < 0)
3032 __initcall(init_smk_fs);