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 <linux/slab.h>
24 #include <net/net_namespace.h>
25 #include <net/cipso_ipv4.h>
26 #include <linux/seq_file.h>
27 #include <linux/ctype.h>
28 #include <linux/audit.h>
29 #include <linux/magic.h>
32 #define BEBITS (sizeof(__be32) * 8)
34 * smackfs pseudo filesystem.
39 SMK_LOAD = 3, /* load policy */
40 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
41 SMK_DOI = 5, /* CIPSO DOI */
42 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
43 SMK_AMBIENT = 7, /* internet ambient label */
44 SMK_NET4ADDR = 8, /* single label hosts */
45 SMK_ONLYCAP = 9, /* the only "capable" label */
46 SMK_LOGGING = 10, /* logging */
47 SMK_LOAD_SELF = 11, /* task specific rules */
48 SMK_ACCESSES = 12, /* access policy */
49 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
50 SMK_LOAD2 = 14, /* load policy with long labels */
51 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
52 SMK_ACCESS2 = 16, /* make an access check with long labels */
53 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
54 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
55 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
56 SMK_SYSLOG = 20, /* change syslog label) */
57 SMK_PTRACE = 21, /* set ptrace rule */
58 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
59 SMK_UNCONFINED = 22, /* define an unconfined label */
61 #if IS_ENABLED(CONFIG_IPV6)
62 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
63 #endif /* CONFIG_IPV6 */
64 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
70 static DEFINE_MUTEX(smack_master_list_lock);
71 static DEFINE_MUTEX(smack_cipso_lock);
72 static DEFINE_MUTEX(smack_ambient_lock);
73 static DEFINE_MUTEX(smk_net4addr_lock);
74 #if IS_ENABLED(CONFIG_IPV6)
75 static DEFINE_MUTEX(smk_net6addr_lock);
76 #endif /* CONFIG_IPV6 */
79 * This is the "ambient" label for network traffic.
80 * If it isn't somehow marked, use this.
81 * It can be reset via smackfs/ambient
83 struct smack_known *smack_net_ambient;
86 * This is the level in a CIPSO header that indicates a
87 * smack label is contained directly in the category set.
88 * It can be reset via smackfs/direct
90 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
93 * This is the level in a CIPSO header that indicates a
94 * secid is contained directly in the category set.
95 * It can be reset via smackfs/mapped
97 int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
99 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
101 * Allow one label to be unconfined. This is for
102 * debugging and application bring-up purposes only.
103 * It is bad and wrong, but everyone seems to expect
106 struct smack_known *smack_unconfined;
110 * If this value is set restrict syslog use to the label specified.
111 * It can be reset via smackfs/syslog
113 struct smack_known *smack_syslog_label;
116 * Ptrace current rule
117 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
118 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
120 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
122 int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
125 * Certain IP addresses may be designated as single label hosts.
126 * Packets are sent there unlabeled, but only from tasks that
127 * can write to the specified label.
130 LIST_HEAD(smk_net4addr_list);
131 #if IS_ENABLED(CONFIG_IPV6)
132 LIST_HEAD(smk_net6addr_list);
133 #endif /* CONFIG_IPV6 */
136 * Rule lists are maintained for each label.
137 * This master list is just for reading /smack/load and /smack/load2.
139 struct smack_master_list {
140 struct list_head list;
141 struct smack_rule *smk_rule;
144 static LIST_HEAD(smack_rule_list);
146 struct smack_parsed_rule {
147 struct smack_known *smk_subject;
148 struct smack_known *smk_object;
153 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
156 * Values for parsing cipso rules
157 * SMK_DIGITLEN: Length of a digit field in a rule.
158 * SMK_CIPSOMIN: Minimum possible cipso rule length.
159 * SMK_CIPSOMAX: Maximum possible cipso rule length.
161 #define SMK_DIGITLEN 4
162 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
163 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
166 * Values for parsing MAC rules
167 * SMK_ACCESS: Maximum possible combination of access permissions
168 * SMK_ACCESSLEN: Maximum length for a rule access field
169 * SMK_LOADLEN: Smack rule length
171 #define SMK_OACCESS "rwxa"
172 #define SMK_ACCESS "rwxatl"
173 #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
174 #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
175 #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
176 #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
179 * Stricly for CIPSO level manipulation.
180 * Set the category bit number in a smack label sized buffer.
182 static inline void smack_catset_bit(unsigned int cat, char *catsetp)
184 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
187 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
191 * smk_netlabel_audit_set - fill a netlbl_audit struct
192 * @nap: structure to fill
194 static void smk_netlabel_audit_set(struct netlbl_audit *nap)
196 struct smack_known *skp = smk_of_current();
198 nap->loginuid = audit_get_loginuid(current);
199 nap->sessionid = audit_get_sessionid(current);
200 nap->secid = skp->smk_secid;
204 * Value for parsing single label host rules
207 #define SMK_NETLBLADDRMIN 9
210 * smk_set_access - add a rule to the rule list or replace an old rule
211 * @srp: the rule to add or replace
212 * @rule_list: the list of rules
213 * @rule_lock: the rule list lock
214 * @global: if non-zero, indicates a global rule
216 * Looks through the current subject/object/access list for
217 * the subject/object pair and replaces the access that was
218 * there. If the pair isn't found add it with the specified
221 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
222 * during the allocation of the new pair to add.
224 static int smk_set_access(struct smack_parsed_rule *srp,
225 struct list_head *rule_list,
226 struct mutex *rule_lock, int global)
228 struct smack_rule *sp;
229 struct smack_master_list *smlp;
233 mutex_lock(rule_lock);
236 * Because the object label is less likely to match
237 * than the subject label check it first
239 list_for_each_entry_rcu(sp, rule_list, list) {
240 if (sp->smk_object == srp->smk_object &&
241 sp->smk_subject == srp->smk_subject) {
243 sp->smk_access |= srp->smk_access1;
244 sp->smk_access &= ~srp->smk_access2;
250 sp = kzalloc(sizeof(*sp), GFP_KERNEL);
256 sp->smk_subject = srp->smk_subject;
257 sp->smk_object = srp->smk_object;
258 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
260 list_add_rcu(&sp->list, rule_list);
262 * If this is a global as opposed to self and a new rule
263 * it needs to get added for reporting.
266 mutex_unlock(rule_lock);
267 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
270 mutex_lock(&smack_master_list_lock);
271 list_add_rcu(&smlp->list, &smack_rule_list);
272 mutex_unlock(&smack_master_list_lock);
280 mutex_unlock(rule_lock);
285 * smk_perm_from_str - parse smack accesses from a text string
286 * @string: a text string that contains a Smack accesses code
288 * Returns an integer with respective bits set for specified accesses.
290 static int smk_perm_from_str(const char *string)
295 for (cp = string; ; cp++)
317 perm |= MAY_TRANSMUTE;
333 * smk_fill_rule - Fill Smack rule from strings
334 * @subject: subject label string
335 * @object: object label string
336 * @access1: access string
337 * @access2: string with permissions to be removed
339 * @import: if non-zero, import labels
340 * @len: label length limit
342 * Returns 0 on success, appropriate error code on failure.
344 static int smk_fill_rule(const char *subject, const char *object,
345 const char *access1, const char *access2,
346 struct smack_parsed_rule *rule, int import,
350 struct smack_known *skp;
353 rule->smk_subject = smk_import_entry(subject, len);
354 if (IS_ERR(rule->smk_subject))
355 return PTR_ERR(rule->smk_subject);
357 rule->smk_object = smk_import_entry(object, len);
358 if (IS_ERR(rule->smk_object))
359 return PTR_ERR(rule->smk_object);
361 cp = smk_parse_smack(subject, len);
364 skp = smk_find_entry(cp);
368 rule->smk_subject = skp;
370 cp = smk_parse_smack(object, len);
373 skp = smk_find_entry(cp);
377 rule->smk_object = skp;
380 rule->smk_access1 = smk_perm_from_str(access1);
382 rule->smk_access2 = smk_perm_from_str(access2);
384 rule->smk_access2 = ~rule->smk_access1;
390 * smk_parse_rule - parse Smack rule from load string
391 * @data: string to be parsed whose size is SMK_LOADLEN
393 * @import: if non-zero, import labels
395 * Returns 0 on success, -1 on errors.
397 static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
402 rc = smk_fill_rule(data, data + SMK_LABELLEN,
403 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
404 import, SMK_LABELLEN);
409 * smk_parse_long_rule - parse Smack rule from rule string
410 * @data: string to be parsed, null terminated
411 * @rule: Will be filled with Smack parsed rule
412 * @import: if non-zero, import labels
413 * @tokens: numer of substrings expected in data
415 * Returns number of processed bytes on success, -ERRNO on failure.
417 static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
418 int import, int tokens)
426 * Parsing the rule in-place, filling all white-spaces with '\0'
428 for (i = 0; i < tokens; ++i) {
429 while (isspace(data[cnt]))
432 if (data[cnt] == '\0')
433 /* Unexpected end of data */
438 while (data[cnt] && !isspace(data[cnt]))
441 while (isspace(data[cnt]))
447 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
448 return rc == 0 ? cnt : rc;
451 #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
452 #define SMK_LONG_FMT 1 /* Variable long label format */
453 #define SMK_CHANGE_FMT 2 /* Rule modification format */
455 * smk_write_rules_list - write() for any /smack rule file
456 * @file: file pointer, not actually used
457 * @buf: where to get the data from
459 * @ppos: where to start - must be 0
460 * @rule_list: the list of rules to write to
461 * @rule_lock: lock for the rule list
462 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
464 * Get one smack access rule from above.
465 * The format for SMK_LONG_FMT is:
466 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
467 * The format for SMK_FIXED24_FMT is exactly:
468 * "subject object rwxat"
469 * The format for SMK_CHANGE_FMT is:
470 * "subject<whitespace>object<whitespace>
471 * acc_enable<whitespace>acc_disable[<whitespace>...]"
473 static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
474 size_t count, loff_t *ppos,
475 struct list_head *rule_list,
476 struct mutex *rule_lock, int format)
478 struct smack_parsed_rule rule;
487 * Enough data must be present.
492 if (format == SMK_FIXED24_FMT) {
494 * Minor hack for backward compatibility
496 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
499 if (count >= PAGE_SIZE) {
500 count = PAGE_SIZE - 1;
505 data = memdup_user_nul(buf, count);
507 return PTR_ERR(data);
510 * In case of parsing only part of user buf,
511 * avoid having partial rule at the data buffer
514 while (count > 0 && (data[count - 1] != '\n'))
523 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
524 while (cnt < count) {
525 if (format == SMK_FIXED24_FMT) {
526 rc = smk_parse_rule(data, &rule, 1);
531 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
541 if (rule_list == NULL)
542 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
543 &rule.smk_subject->smk_rules_lock, 1);
545 rc = smk_set_access(&rule, rule_list, rule_lock, 0);
558 * Core logic for smackfs seq list operations.
561 static void *smk_seq_start(struct seq_file *s, loff_t *pos,
562 struct list_head *head)
564 struct list_head *list;
568 for (list = rcu_dereference(list_next_rcu(head));
570 list = rcu_dereference(list_next_rcu(list))) {
578 static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
579 struct list_head *head)
581 struct list_head *list = v;
584 list = rcu_dereference(list_next_rcu(list));
586 return (list == head) ? NULL : list;
589 static void smk_seq_stop(struct seq_file *s, void *v)
594 static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
597 * Don't show any rules with label names too long for
598 * interface file (/smack/load or /smack/load2)
599 * because you should expect to be able to write
600 * anything you read back.
602 if (strlen(srp->smk_subject->smk_known) >= max ||
603 strlen(srp->smk_object->smk_known) >= max)
606 if (srp->smk_access == 0)
609 seq_printf(s, "%s %s",
610 srp->smk_subject->smk_known,
611 srp->smk_object->smk_known);
615 if (srp->smk_access & MAY_READ)
617 if (srp->smk_access & MAY_WRITE)
619 if (srp->smk_access & MAY_EXEC)
621 if (srp->smk_access & MAY_APPEND)
623 if (srp->smk_access & MAY_TRANSMUTE)
625 if (srp->smk_access & MAY_LOCK)
627 if (srp->smk_access & MAY_BRINGUP)
634 * Seq_file read operations for /smack/load
637 static void *load2_seq_start(struct seq_file *s, loff_t *pos)
639 return smk_seq_start(s, pos, &smack_rule_list);
642 static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
644 return smk_seq_next(s, v, pos, &smack_rule_list);
647 static int load_seq_show(struct seq_file *s, void *v)
649 struct list_head *list = v;
650 struct smack_master_list *smlp =
651 list_entry_rcu(list, struct smack_master_list, list);
653 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
658 static const struct seq_operations load_seq_ops = {
659 .start = load2_seq_start,
660 .next = load2_seq_next,
661 .show = load_seq_show,
662 .stop = smk_seq_stop,
666 * smk_open_load - open() for /smack/load
667 * @inode: inode structure representing file
668 * @file: "load" file pointer
670 * For reading, use load_seq_* seq_file reading operations.
672 static int smk_open_load(struct inode *inode, struct file *file)
674 return seq_open(file, &load_seq_ops);
678 * smk_write_load - write() for /smack/load
679 * @file: file pointer, not actually used
680 * @buf: where to get the data from
682 * @ppos: where to start - must be 0
685 static ssize_t smk_write_load(struct file *file, const char __user *buf,
686 size_t count, loff_t *ppos)
689 * Must have privilege.
691 * Enough data must be present.
693 if (!smack_privileged(CAP_MAC_ADMIN))
696 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
700 static const struct file_operations smk_load_ops = {
701 .open = smk_open_load,
704 .write = smk_write_load,
705 .release = seq_release,
709 * smk_cipso_doi - initialize the CIPSO domain
711 static void smk_cipso_doi(void)
714 struct cipso_v4_doi *doip;
715 struct netlbl_audit nai;
717 smk_netlabel_audit_set(&nai);
719 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
721 printk(KERN_WARNING "%s:%d remove rc = %d\n",
722 __func__, __LINE__, rc);
724 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
725 doip->map.std = NULL;
726 doip->doi = smk_cipso_doi_value;
727 doip->type = CIPSO_V4_MAP_PASS;
728 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
729 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
730 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
732 rc = netlbl_cfg_cipsov4_add(doip, &nai);
734 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
735 __func__, __LINE__, rc);
739 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
741 printk(KERN_WARNING "%s:%d map add rc = %d\n",
742 __func__, __LINE__, rc);
743 netlbl_cfg_cipsov4_del(doip->doi, &nai);
749 * smk_unlbl_ambient - initialize the unlabeled domain
750 * @oldambient: previous domain string
752 static void smk_unlbl_ambient(char *oldambient)
755 struct netlbl_audit nai;
757 smk_netlabel_audit_set(&nai);
759 if (oldambient != NULL) {
760 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
762 printk(KERN_WARNING "%s:%d remove rc = %d\n",
763 __func__, __LINE__, rc);
765 if (smack_net_ambient == NULL)
766 smack_net_ambient = &smack_known_floor;
768 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
771 printk(KERN_WARNING "%s:%d add rc = %d\n",
772 __func__, __LINE__, rc);
776 * Seq_file read operations for /smack/cipso
779 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
781 return smk_seq_start(s, pos, &smack_known_list);
784 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
786 return smk_seq_next(s, v, pos, &smack_known_list);
790 * Print cipso labels in format:
791 * label level[/cat[,cat]]
793 static int cipso_seq_show(struct seq_file *s, void *v)
795 struct list_head *list = v;
796 struct smack_known *skp =
797 list_entry_rcu(list, struct smack_known, list);
798 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
803 * Don't show a label that could not have been set using
804 * /smack/cipso. This is in support of the notion that
805 * anything read from /smack/cipso ought to be writeable
808 * /smack/cipso2 should be used instead.
810 if (strlen(skp->smk_known) >= SMK_LABELLEN)
813 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
815 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
816 i = netlbl_catmap_walk(cmp, i + 1)) {
817 seq_printf(s, "%c%d", sep, i);
826 static const struct seq_operations cipso_seq_ops = {
827 .start = cipso_seq_start,
828 .next = cipso_seq_next,
829 .show = cipso_seq_show,
830 .stop = smk_seq_stop,
834 * smk_open_cipso - open() for /smack/cipso
835 * @inode: inode structure representing file
836 * @file: "cipso" file pointer
838 * Connect our cipso_seq_* operations with /smack/cipso
841 static int smk_open_cipso(struct inode *inode, struct file *file)
843 return seq_open(file, &cipso_seq_ops);
847 * smk_set_cipso - do the work for write() for cipso and cipso2
848 * @file: file pointer, not actually used
849 * @buf: where to get the data from
851 * @ppos: where to start
852 * @format: /smack/cipso or /smack/cipso2
854 * Accepts only one cipso rule per write call.
855 * Returns number of bytes written or error code, as appropriate
857 static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
858 size_t count, loff_t *ppos, int format)
860 struct netlbl_lsm_catmap *old_cat;
861 struct smack_known *skp;
862 struct netlbl_lsm_secattr ncats;
863 char mapcatset[SMK_CIPSOLEN];
867 ssize_t rc = -EINVAL;
874 * Must have privilege.
876 * Enough data must be present.
878 if (!smack_privileged(CAP_MAC_ADMIN))
882 if (format == SMK_FIXED24_FMT &&
883 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
885 if (count > PAGE_SIZE)
888 data = memdup_user_nul(buf, count);
890 return PTR_ERR(data);
894 * Only allow one writer at a time. Writes should be
895 * quite rare and small in any case.
897 mutex_lock(&smack_cipso_lock);
899 skp = smk_import_entry(rule, 0);
905 if (format == SMK_FIXED24_FMT)
906 rule += SMK_LABELLEN;
908 rule += strlen(skp->smk_known) + 1;
910 if (rule > data + count) {
915 ret = sscanf(rule, "%d", &maplevel);
916 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
919 rule += SMK_DIGITLEN;
920 if (rule > data + count) {
925 ret = sscanf(rule, "%d", &catlen);
926 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
929 if (format == SMK_FIXED24_FMT &&
930 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
933 memset(mapcatset, 0, sizeof(mapcatset));
935 for (i = 0; i < catlen; i++) {
936 rule += SMK_DIGITLEN;
937 if (rule > data + count) {
941 ret = sscanf(rule, "%u", &cat);
942 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
945 smack_catset_bit(cat, mapcatset);
948 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
950 old_cat = skp->smk_netlabel.attr.mls.cat;
951 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
952 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
954 netlbl_catmap_free(old_cat);
959 mutex_unlock(&smack_cipso_lock);
965 * smk_write_cipso - write() for /smack/cipso
966 * @file: file pointer, not actually used
967 * @buf: where to get the data from
969 * @ppos: where to start
971 * Accepts only one cipso rule per write call.
972 * Returns number of bytes written or error code, as appropriate
974 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
975 size_t count, loff_t *ppos)
977 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
980 static const struct file_operations smk_cipso_ops = {
981 .open = smk_open_cipso,
984 .write = smk_write_cipso,
985 .release = seq_release,
989 * Seq_file read operations for /smack/cipso2
993 * Print cipso labels in format:
994 * label level[/cat[,cat]]
996 static int cipso2_seq_show(struct seq_file *s, void *v)
998 struct list_head *list = v;
999 struct smack_known *skp =
1000 list_entry_rcu(list, struct smack_known, list);
1001 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
1005 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
1007 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
1008 i = netlbl_catmap_walk(cmp, i + 1)) {
1009 seq_printf(s, "%c%d", sep, i);
1018 static const struct seq_operations cipso2_seq_ops = {
1019 .start = cipso_seq_start,
1020 .next = cipso_seq_next,
1021 .show = cipso2_seq_show,
1022 .stop = smk_seq_stop,
1026 * smk_open_cipso2 - open() for /smack/cipso2
1027 * @inode: inode structure representing file
1028 * @file: "cipso2" file pointer
1030 * Connect our cipso_seq_* operations with /smack/cipso2
1033 static int smk_open_cipso2(struct inode *inode, struct file *file)
1035 return seq_open(file, &cipso2_seq_ops);
1039 * smk_write_cipso2 - write() for /smack/cipso2
1040 * @file: file pointer, not actually used
1041 * @buf: where to get the data from
1042 * @count: bytes sent
1043 * @ppos: where to start
1045 * Accepts only one cipso rule per write call.
1046 * Returns number of bytes written or error code, as appropriate
1048 static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1049 size_t count, loff_t *ppos)
1051 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1054 static const struct file_operations smk_cipso2_ops = {
1055 .open = smk_open_cipso2,
1057 .llseek = seq_lseek,
1058 .write = smk_write_cipso2,
1059 .release = seq_release,
1063 * Seq_file read operations for /smack/netlabel
1066 static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1068 return smk_seq_start(s, pos, &smk_net4addr_list);
1071 static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1073 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1077 * Print host/label pairs
1079 static int net4addr_seq_show(struct seq_file *s, void *v)
1081 struct list_head *list = v;
1082 struct smk_net4addr *skp =
1083 list_entry_rcu(list, struct smk_net4addr, list);
1084 char *kp = SMACK_CIPSO_OPTION;
1086 if (skp->smk_label != NULL)
1087 kp = skp->smk_label->smk_known;
1088 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1089 skp->smk_masks, kp);
1094 static const struct seq_operations net4addr_seq_ops = {
1095 .start = net4addr_seq_start,
1096 .next = net4addr_seq_next,
1097 .show = net4addr_seq_show,
1098 .stop = smk_seq_stop,
1102 * smk_open_net4addr - open() for /smack/netlabel
1103 * @inode: inode structure representing file
1104 * @file: "netlabel" file pointer
1106 * Connect our net4addr_seq_* operations with /smack/netlabel
1109 static int smk_open_net4addr(struct inode *inode, struct file *file)
1111 return seq_open(file, &net4addr_seq_ops);
1115 * smk_net4addr_insert
1116 * @new : netlabel to insert
1118 * This helper insert netlabel in the smack_net4addrs list
1119 * sorted by netmask length (longest to smallest)
1120 * locked by &smk_net4addr_lock in smk_write_net4addr
1123 static void smk_net4addr_insert(struct smk_net4addr *new)
1125 struct smk_net4addr *m;
1126 struct smk_net4addr *m_next;
1128 if (list_empty(&smk_net4addr_list)) {
1129 list_add_rcu(&new->list, &smk_net4addr_list);
1133 m = list_entry_rcu(smk_net4addr_list.next,
1134 struct smk_net4addr, list);
1136 /* the comparison '>' is a bit hacky, but works */
1137 if (new->smk_masks > m->smk_masks) {
1138 list_add_rcu(&new->list, &smk_net4addr_list);
1142 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1143 if (list_is_last(&m->list, &smk_net4addr_list)) {
1144 list_add_rcu(&new->list, &m->list);
1147 m_next = list_entry_rcu(m->list.next,
1148 struct smk_net4addr, list);
1149 if (new->smk_masks > m_next->smk_masks) {
1150 list_add_rcu(&new->list, &m->list);
1158 * smk_write_net4addr - write() for /smack/netlabel
1159 * @file: file pointer, not actually used
1160 * @buf: where to get the data from
1161 * @count: bytes sent
1162 * @ppos: where to start
1164 * Accepts only one net4addr per write call.
1165 * Returns number of bytes written or error code, as appropriate
1167 static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1168 size_t count, loff_t *ppos)
1170 struct smk_net4addr *snp;
1171 struct sockaddr_in newname;
1173 struct smack_known *skp = NULL;
1175 char *host = (char *)&newname.sin_addr.s_addr;
1177 struct netlbl_audit audit_info;
1178 struct in_addr mask;
1182 u32 mask_bits = (1<<31);
1187 * Must have privilege.
1188 * No partial writes.
1189 * Enough data must be present.
1190 * "<addr/mask, as a.b.c.d/e><space><label>"
1191 * "<addr, as a.b.c.d><space><label>"
1193 if (!smack_privileged(CAP_MAC_ADMIN))
1197 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1200 data = memdup_user_nul(buf, count);
1202 return PTR_ERR(data);
1204 smack = kzalloc(count + 1, GFP_KERNEL);
1205 if (smack == NULL) {
1210 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1211 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1213 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1214 &host[0], &host[1], &host[2], &host[3], smack);
1222 if (masks > BEBITS) {
1228 * If smack begins with '-', it is an option, don't import it
1230 if (smack[0] != '-') {
1231 skp = smk_import_entry(smack, 0);
1238 * Only the -CIPSO option is supported for IPv4
1240 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1246 for (m = masks, temp_mask = 0; m > 0; m--) {
1247 temp_mask |= mask_bits;
1250 mask.s_addr = cpu_to_be32(temp_mask);
1252 newname.sin_addr.s_addr &= mask.s_addr;
1254 * Only allow one writer at a time. Writes should be
1255 * quite rare and small in any case.
1257 mutex_lock(&smk_net4addr_lock);
1259 nsa = newname.sin_addr.s_addr;
1260 /* try to find if the prefix is already in the list */
1262 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1263 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1268 smk_netlabel_audit_set(&audit_info);
1271 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1276 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1277 snp->smk_mask.s_addr = mask.s_addr;
1278 snp->smk_label = skp;
1279 snp->smk_masks = masks;
1280 smk_net4addr_insert(snp);
1284 * Delete the unlabeled entry, only if the previous label
1285 * wasn't the special CIPSO option
1287 if (snp->smk_label != NULL)
1288 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1289 &snp->smk_host, &snp->smk_mask,
1290 PF_INET, &audit_info);
1293 snp->smk_label = skp;
1297 * Now tell netlabel about the single label nature of
1298 * this host so that incoming packets get labeled.
1299 * but only if we didn't get the special CIPSO option
1301 if (rc == 0 && skp != NULL)
1302 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1303 &snp->smk_host, &snp->smk_mask, PF_INET,
1304 snp->smk_label->smk_secid, &audit_info);
1309 mutex_unlock(&smk_net4addr_lock);
1319 static const struct file_operations smk_net4addr_ops = {
1320 .open = smk_open_net4addr,
1322 .llseek = seq_lseek,
1323 .write = smk_write_net4addr,
1324 .release = seq_release,
1327 #if IS_ENABLED(CONFIG_IPV6)
1329 * Seq_file read operations for /smack/netlabel6
1332 static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1334 return smk_seq_start(s, pos, &smk_net6addr_list);
1337 static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1339 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1343 * Print host/label pairs
1345 static int net6addr_seq_show(struct seq_file *s, void *v)
1347 struct list_head *list = v;
1348 struct smk_net6addr *skp =
1349 list_entry(list, struct smk_net6addr, list);
1351 if (skp->smk_label != NULL)
1352 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1353 skp->smk_label->smk_known);
1358 static const struct seq_operations net6addr_seq_ops = {
1359 .start = net6addr_seq_start,
1360 .next = net6addr_seq_next,
1361 .show = net6addr_seq_show,
1362 .stop = smk_seq_stop,
1366 * smk_open_net6addr - open() for /smack/netlabel
1367 * @inode: inode structure representing file
1368 * @file: "netlabel" file pointer
1370 * Connect our net6addr_seq_* operations with /smack/netlabel
1373 static int smk_open_net6addr(struct inode *inode, struct file *file)
1375 return seq_open(file, &net6addr_seq_ops);
1379 * smk_net6addr_insert
1380 * @new : entry to insert
1382 * This inserts an entry in the smack_net6addrs list
1383 * sorted by netmask length (longest to smallest)
1384 * locked by &smk_net6addr_lock in smk_write_net6addr
1387 static void smk_net6addr_insert(struct smk_net6addr *new)
1389 struct smk_net6addr *m_next;
1390 struct smk_net6addr *m;
1392 if (list_empty(&smk_net6addr_list)) {
1393 list_add_rcu(&new->list, &smk_net6addr_list);
1397 m = list_entry_rcu(smk_net6addr_list.next,
1398 struct smk_net6addr, list);
1400 if (new->smk_masks > m->smk_masks) {
1401 list_add_rcu(&new->list, &smk_net6addr_list);
1405 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1406 if (list_is_last(&m->list, &smk_net6addr_list)) {
1407 list_add_rcu(&new->list, &m->list);
1410 m_next = list_entry_rcu(m->list.next,
1411 struct smk_net6addr, list);
1412 if (new->smk_masks > m_next->smk_masks) {
1413 list_add_rcu(&new->list, &m->list);
1421 * smk_write_net6addr - write() for /smack/netlabel
1422 * @file: file pointer, not actually used
1423 * @buf: where to get the data from
1424 * @count: bytes sent
1425 * @ppos: where to start
1427 * Accepts only one net6addr per write call.
1428 * Returns number of bytes written or error code, as appropriate
1430 static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1431 size_t count, loff_t *ppos)
1433 struct smk_net6addr *snp;
1434 struct in6_addr newname;
1435 struct in6_addr fullmask;
1436 struct smack_known *skp = NULL;
1442 unsigned int scanned[8];
1444 unsigned int mask = 128;
1447 * Must have privilege.
1448 * No partial writes.
1449 * Enough data must be present.
1450 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1451 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1453 if (!smack_privileged(CAP_MAC_ADMIN))
1457 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1460 data = memdup_user_nul(buf, count);
1462 return PTR_ERR(data);
1464 smack = kzalloc(count + 1, GFP_KERNEL);
1465 if (smack == NULL) {
1470 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1471 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1472 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1475 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1476 &scanned[0], &scanned[1], &scanned[2],
1477 &scanned[3], &scanned[4], &scanned[5],
1478 &scanned[6], &scanned[7], smack);
1488 for (i = 0; i < 8; i++) {
1489 if (scanned[i] > 0xffff) {
1493 newname.s6_addr16[i] = htons(scanned[i]);
1497 * If smack begins with '-', it is an option, don't import it
1499 if (smack[0] != '-') {
1500 skp = smk_import_entry(smack, 0);
1507 * Only -DELETE is supported for IPv6
1509 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1515 for (i = 0, m = mask; i < 8; i++) {
1517 fullmask.s6_addr16[i] = 0xffff;
1520 fullmask.s6_addr16[i] = (1 << m) - 1;
1523 fullmask.s6_addr16[i] = 0;
1524 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1528 * Only allow one writer at a time. Writes should be
1529 * quite rare and small in any case.
1531 mutex_lock(&smk_net6addr_lock);
1533 * Try to find the prefix in the list
1535 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1536 if (mask != snp->smk_masks)
1538 for (found = 1, i = 0; i < 8; i++) {
1539 if (newname.s6_addr16[i] !=
1540 snp->smk_host.s6_addr16[i]) {
1549 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1553 snp->smk_host = newname;
1554 snp->smk_mask = fullmask;
1555 snp->smk_masks = mask;
1556 snp->smk_label = skp;
1557 smk_net6addr_insert(snp);
1560 snp->smk_label = skp;
1566 mutex_unlock(&smk_net6addr_lock);
1576 static const struct file_operations smk_net6addr_ops = {
1577 .open = smk_open_net6addr,
1579 .llseek = seq_lseek,
1580 .write = smk_write_net6addr,
1581 .release = seq_release,
1583 #endif /* CONFIG_IPV6 */
1586 * smk_read_doi - read() for /smack/doi
1587 * @filp: file pointer, not actually used
1588 * @buf: where to put the result
1589 * @count: maximum to send along
1590 * @ppos: where to start
1592 * Returns number of bytes read or error code, as appropriate
1594 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1595 size_t count, loff_t *ppos)
1603 sprintf(temp, "%d", smk_cipso_doi_value);
1604 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1610 * smk_write_doi - write() for /smack/doi
1611 * @file: file pointer, not actually used
1612 * @buf: where to get the data from
1613 * @count: bytes sent
1614 * @ppos: where to start
1616 * Returns number of bytes written or error code, as appropriate
1618 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1619 size_t count, loff_t *ppos)
1624 if (!smack_privileged(CAP_MAC_ADMIN))
1627 if (count >= sizeof(temp) || count == 0)
1630 if (copy_from_user(temp, buf, count) != 0)
1635 if (sscanf(temp, "%d", &i) != 1)
1638 smk_cipso_doi_value = i;
1645 static const struct file_operations smk_doi_ops = {
1646 .read = smk_read_doi,
1647 .write = smk_write_doi,
1648 .llseek = default_llseek,
1652 * smk_read_direct - read() for /smack/direct
1653 * @filp: file pointer, not actually used
1654 * @buf: where to put the result
1655 * @count: maximum to send along
1656 * @ppos: where to start
1658 * Returns number of bytes read or error code, as appropriate
1660 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1661 size_t count, loff_t *ppos)
1669 sprintf(temp, "%d", smack_cipso_direct);
1670 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1676 * smk_write_direct - write() for /smack/direct
1677 * @file: file pointer, not actually used
1678 * @buf: where to get the data from
1679 * @count: bytes sent
1680 * @ppos: where to start
1682 * Returns number of bytes written or error code, as appropriate
1684 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1685 size_t count, loff_t *ppos)
1687 struct smack_known *skp;
1691 if (!smack_privileged(CAP_MAC_ADMIN))
1694 if (count >= sizeof(temp) || count == 0)
1697 if (copy_from_user(temp, buf, count) != 0)
1702 if (sscanf(temp, "%d", &i) != 1)
1706 * Don't do anything if the value hasn't actually changed.
1707 * If it is changing reset the level on entries that were
1708 * set up to be direct when they were created.
1710 if (smack_cipso_direct != i) {
1711 mutex_lock(&smack_known_lock);
1712 list_for_each_entry_rcu(skp, &smack_known_list, list)
1713 if (skp->smk_netlabel.attr.mls.lvl ==
1715 skp->smk_netlabel.attr.mls.lvl = i;
1716 smack_cipso_direct = i;
1717 mutex_unlock(&smack_known_lock);
1723 static const struct file_operations smk_direct_ops = {
1724 .read = smk_read_direct,
1725 .write = smk_write_direct,
1726 .llseek = default_llseek,
1730 * smk_read_mapped - read() for /smack/mapped
1731 * @filp: file pointer, not actually used
1732 * @buf: where to put the result
1733 * @count: maximum to send along
1734 * @ppos: where to start
1736 * Returns number of bytes read or error code, as appropriate
1738 static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1739 size_t count, loff_t *ppos)
1747 sprintf(temp, "%d", smack_cipso_mapped);
1748 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1754 * smk_write_mapped - write() for /smack/mapped
1755 * @file: file pointer, not actually used
1756 * @buf: where to get the data from
1757 * @count: bytes sent
1758 * @ppos: where to start
1760 * Returns number of bytes written or error code, as appropriate
1762 static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1763 size_t count, loff_t *ppos)
1765 struct smack_known *skp;
1769 if (!smack_privileged(CAP_MAC_ADMIN))
1772 if (count >= sizeof(temp) || count == 0)
1775 if (copy_from_user(temp, buf, count) != 0)
1780 if (sscanf(temp, "%d", &i) != 1)
1784 * Don't do anything if the value hasn't actually changed.
1785 * If it is changing reset the level on entries that were
1786 * set up to be mapped when they were created.
1788 if (smack_cipso_mapped != i) {
1789 mutex_lock(&smack_known_lock);
1790 list_for_each_entry_rcu(skp, &smack_known_list, list)
1791 if (skp->smk_netlabel.attr.mls.lvl ==
1793 skp->smk_netlabel.attr.mls.lvl = i;
1794 smack_cipso_mapped = i;
1795 mutex_unlock(&smack_known_lock);
1801 static const struct file_operations smk_mapped_ops = {
1802 .read = smk_read_mapped,
1803 .write = smk_write_mapped,
1804 .llseek = default_llseek,
1808 * smk_read_ambient - read() for /smack/ambient
1809 * @filp: file pointer, not actually used
1810 * @buf: where to put the result
1811 * @cn: maximum to send along
1812 * @ppos: where to start
1814 * Returns number of bytes read or error code, as appropriate
1816 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1817 size_t cn, loff_t *ppos)
1825 * Being careful to avoid a problem in the case where
1826 * smack_net_ambient gets changed in midstream.
1828 mutex_lock(&smack_ambient_lock);
1830 asize = strlen(smack_net_ambient->smk_known) + 1;
1833 rc = simple_read_from_buffer(buf, cn, ppos,
1834 smack_net_ambient->smk_known,
1839 mutex_unlock(&smack_ambient_lock);
1845 * smk_write_ambient - write() for /smack/ambient
1846 * @file: file pointer, not actually used
1847 * @buf: where to get the data from
1848 * @count: bytes sent
1849 * @ppos: where to start
1851 * Returns number of bytes written or error code, as appropriate
1853 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1854 size_t count, loff_t *ppos)
1856 struct smack_known *skp;
1861 if (!smack_privileged(CAP_MAC_ADMIN))
1864 /* Enough data must be present */
1865 if (count == 0 || count > PAGE_SIZE)
1868 data = memdup_user_nul(buf, count);
1870 return PTR_ERR(data);
1872 skp = smk_import_entry(data, count);
1878 mutex_lock(&smack_ambient_lock);
1880 oldambient = smack_net_ambient->smk_known;
1881 smack_net_ambient = skp;
1882 smk_unlbl_ambient(oldambient);
1884 mutex_unlock(&smack_ambient_lock);
1891 static const struct file_operations smk_ambient_ops = {
1892 .read = smk_read_ambient,
1893 .write = smk_write_ambient,
1894 .llseek = default_llseek,
1898 * Seq_file operations for /smack/onlycap
1900 static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1902 return smk_seq_start(s, pos, &smack_onlycap_list);
1905 static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1907 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1910 static int onlycap_seq_show(struct seq_file *s, void *v)
1912 struct list_head *list = v;
1913 struct smack_known_list_elem *sklep =
1914 list_entry_rcu(list, struct smack_known_list_elem, list);
1916 seq_puts(s, sklep->smk_label->smk_known);
1922 static const struct seq_operations onlycap_seq_ops = {
1923 .start = onlycap_seq_start,
1924 .next = onlycap_seq_next,
1925 .show = onlycap_seq_show,
1926 .stop = smk_seq_stop,
1929 static int smk_open_onlycap(struct inode *inode, struct file *file)
1931 return seq_open(file, &onlycap_seq_ops);
1935 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1936 * The caller must hold appropriate mutex to prevent concurrent modifications
1937 * to the public list.
1938 * Private list is assumed to be not accessible to other threads yet.
1940 * @public: public list
1941 * @private: private list
1943 static void smk_list_swap_rcu(struct list_head *public,
1944 struct list_head *private)
1946 struct list_head *first, *last;
1948 if (list_empty(public)) {
1949 list_splice_init_rcu(private, public, synchronize_rcu);
1951 /* Remember public list before replacing it */
1952 first = public->next;
1953 last = public->prev;
1955 /* Publish private list in place of public in RCU-safe way */
1956 private->prev->next = public;
1957 private->next->prev = public;
1958 rcu_assign_pointer(public->next, private->next);
1959 public->prev = private->prev;
1963 /* When all readers are done with the old public list,
1964 * attach it in place of private */
1965 private->next = first;
1966 private->prev = last;
1967 first->prev = private;
1968 last->next = private;
1973 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1975 * @data: the string to parse
1976 * @private: destination list
1978 * Returns zero on success or error code, as appropriate
1980 static int smk_parse_label_list(char *data, struct list_head *list)
1983 struct smack_known *skp;
1984 struct smack_known_list_elem *sklep;
1986 while ((tok = strsep(&data, " ")) != NULL) {
1990 skp = smk_import_entry(tok, 0);
1992 return PTR_ERR(skp);
1994 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1998 sklep->smk_label = skp;
1999 list_add(&sklep->list, list);
2006 * smk_destroy_label_list - destroy a list of smack_known_list_elem
2007 * @head: header pointer of the list to destroy
2009 void smk_destroy_label_list(struct list_head *list)
2011 struct smack_known_list_elem *sklep;
2012 struct smack_known_list_elem *sklep2;
2014 list_for_each_entry_safe(sklep, sklep2, list, list)
2017 INIT_LIST_HEAD(list);
2021 * smk_write_onlycap - write() for smackfs/onlycap
2022 * @file: file pointer, not actually used
2023 * @buf: where to get the data from
2024 * @count: bytes sent
2025 * @ppos: where to start
2027 * Returns number of bytes written or error code, as appropriate
2029 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2030 size_t count, loff_t *ppos)
2033 LIST_HEAD(list_tmp);
2036 if (!smack_privileged(CAP_MAC_ADMIN))
2039 if (count > PAGE_SIZE)
2042 data = memdup_user_nul(buf, count);
2044 return PTR_ERR(data);
2046 rc = smk_parse_label_list(data, &list_tmp);
2050 * Clear the smack_onlycap on invalid label errors. This means
2051 * that we can pass a null string to unset the onlycap value.
2053 * Importing will also reject a label beginning with '-',
2054 * so "-usecapabilities" will also work.
2056 * But do so only on invalid label, not on system errors.
2057 * The invalid label must be first to count as clearing attempt.
2059 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2060 mutex_lock(&smack_onlycap_lock);
2061 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2062 mutex_unlock(&smack_onlycap_lock);
2066 smk_destroy_label_list(&list_tmp);
2071 static const struct file_operations smk_onlycap_ops = {
2072 .open = smk_open_onlycap,
2074 .write = smk_write_onlycap,
2075 .llseek = seq_lseek,
2076 .release = seq_release,
2079 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2081 * smk_read_unconfined - read() for smackfs/unconfined
2082 * @filp: file pointer, not actually used
2083 * @buf: where to put the result
2084 * @cn: maximum to send along
2085 * @ppos: where to start
2087 * Returns number of bytes read or error code, as appropriate
2089 static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2090 size_t cn, loff_t *ppos)
2093 ssize_t rc = -EINVAL;
2099 if (smack_unconfined != NULL)
2100 smack = smack_unconfined->smk_known;
2102 asize = strlen(smack) + 1;
2105 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2111 * smk_write_unconfined - write() for smackfs/unconfined
2112 * @file: file pointer, not actually used
2113 * @buf: where to get the data from
2114 * @count: bytes sent
2115 * @ppos: where to start
2117 * Returns number of bytes written or error code, as appropriate
2119 static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2120 size_t count, loff_t *ppos)
2123 struct smack_known *skp;
2126 if (!smack_privileged(CAP_MAC_ADMIN))
2129 if (count > PAGE_SIZE)
2132 data = memdup_user_nul(buf, count);
2134 return PTR_ERR(data);
2137 * Clear the smack_unconfined on invalid label errors. This means
2138 * that we can pass a null string to unset the unconfined value.
2140 * Importing will also reject a label beginning with '-',
2141 * so "-confine" will also work.
2143 * But do so only on invalid label, not on system errors.
2145 skp = smk_import_entry(data, count);
2146 if (PTR_ERR(skp) == -EINVAL)
2148 else if (IS_ERR(skp)) {
2153 smack_unconfined = skp;
2160 static const struct file_operations smk_unconfined_ops = {
2161 .read = smk_read_unconfined,
2162 .write = smk_write_unconfined,
2163 .llseek = default_llseek,
2165 #endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2168 * smk_read_logging - read() for /smack/logging
2169 * @filp: file pointer, not actually used
2170 * @buf: where to put the result
2171 * @cn: maximum to send along
2172 * @ppos: where to start
2174 * Returns number of bytes read or error code, as appropriate
2176 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2177 size_t count, loff_t *ppos)
2185 sprintf(temp, "%d\n", log_policy);
2186 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2191 * smk_write_logging - write() for /smack/logging
2192 * @file: file pointer, not actually used
2193 * @buf: where to get the data from
2194 * @count: bytes sent
2195 * @ppos: where to start
2197 * Returns number of bytes written or error code, as appropriate
2199 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2200 size_t count, loff_t *ppos)
2205 if (!smack_privileged(CAP_MAC_ADMIN))
2208 if (count >= sizeof(temp) || count == 0)
2211 if (copy_from_user(temp, buf, count) != 0)
2216 if (sscanf(temp, "%d", &i) != 1)
2226 static const struct file_operations smk_logging_ops = {
2227 .read = smk_read_logging,
2228 .write = smk_write_logging,
2229 .llseek = default_llseek,
2233 * Seq_file read operations for /smack/load-self
2236 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2238 struct task_smack *tsp = current_security();
2240 return smk_seq_start(s, pos, &tsp->smk_rules);
2243 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2245 struct task_smack *tsp = current_security();
2247 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2250 static int load_self_seq_show(struct seq_file *s, void *v)
2252 struct list_head *list = v;
2253 struct smack_rule *srp =
2254 list_entry_rcu(list, struct smack_rule, list);
2256 smk_rule_show(s, srp, SMK_LABELLEN);
2261 static const struct seq_operations load_self_seq_ops = {
2262 .start = load_self_seq_start,
2263 .next = load_self_seq_next,
2264 .show = load_self_seq_show,
2265 .stop = smk_seq_stop,
2270 * smk_open_load_self - open() for /smack/load-self2
2271 * @inode: inode structure representing file
2272 * @file: "load" file pointer
2274 * For reading, use load_seq_* seq_file reading operations.
2276 static int smk_open_load_self(struct inode *inode, struct file *file)
2278 return seq_open(file, &load_self_seq_ops);
2282 * smk_write_load_self - write() for /smack/load-self
2283 * @file: file pointer, not actually used
2284 * @buf: where to get the data from
2285 * @count: bytes sent
2286 * @ppos: where to start - must be 0
2289 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2290 size_t count, loff_t *ppos)
2292 struct task_smack *tsp = current_security();
2294 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2295 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2298 static const struct file_operations smk_load_self_ops = {
2299 .open = smk_open_load_self,
2301 .llseek = seq_lseek,
2302 .write = smk_write_load_self,
2303 .release = seq_release,
2307 * smk_user_access - handle access check transaction
2308 * @file: file pointer
2309 * @buf: data from user space
2310 * @count: bytes sent
2311 * @ppos: where to start - must be 0
2313 static ssize_t smk_user_access(struct file *file, const char __user *buf,
2314 size_t count, loff_t *ppos, int format)
2316 struct smack_parsed_rule rule;
2320 data = simple_transaction_get(file, buf, count);
2322 return PTR_ERR(data);
2324 if (format == SMK_FIXED24_FMT) {
2325 if (count < SMK_LOADLEN)
2327 res = smk_parse_rule(data, &rule, 0);
2330 * simple_transaction_get() returns null-terminated data
2332 res = smk_parse_long_rule(data, &rule, 0, 3);
2336 res = smk_access(rule.smk_subject, rule.smk_object,
2337 rule.smk_access1, NULL);
2338 else if (res != -ENOENT)
2342 * smk_access() can return a value > 0 in the "bringup" case.
2344 data[0] = res >= 0 ? '1' : '0';
2347 simple_transaction_set(file, 2);
2349 if (format == SMK_FIXED24_FMT)
2355 * smk_write_access - handle access check transaction
2356 * @file: file pointer
2357 * @buf: data from user space
2358 * @count: bytes sent
2359 * @ppos: where to start - must be 0
2361 static ssize_t smk_write_access(struct file *file, const char __user *buf,
2362 size_t count, loff_t *ppos)
2364 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2367 static const struct file_operations smk_access_ops = {
2368 .write = smk_write_access,
2369 .read = simple_transaction_read,
2370 .release = simple_transaction_release,
2371 .llseek = generic_file_llseek,
2376 * Seq_file read operations for /smack/load2
2379 static int load2_seq_show(struct seq_file *s, void *v)
2381 struct list_head *list = v;
2382 struct smack_master_list *smlp =
2383 list_entry_rcu(list, struct smack_master_list, list);
2385 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
2390 static const struct seq_operations load2_seq_ops = {
2391 .start = load2_seq_start,
2392 .next = load2_seq_next,
2393 .show = load2_seq_show,
2394 .stop = smk_seq_stop,
2398 * smk_open_load2 - open() for /smack/load2
2399 * @inode: inode structure representing file
2400 * @file: "load2" file pointer
2402 * For reading, use load2_seq_* seq_file reading operations.
2404 static int smk_open_load2(struct inode *inode, struct file *file)
2406 return seq_open(file, &load2_seq_ops);
2410 * smk_write_load2 - write() for /smack/load2
2411 * @file: file pointer, not actually used
2412 * @buf: where to get the data from
2413 * @count: bytes sent
2414 * @ppos: where to start - must be 0
2417 static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2418 size_t count, loff_t *ppos)
2421 * Must have privilege.
2423 if (!smack_privileged(CAP_MAC_ADMIN))
2426 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2430 static const struct file_operations smk_load2_ops = {
2431 .open = smk_open_load2,
2433 .llseek = seq_lseek,
2434 .write = smk_write_load2,
2435 .release = seq_release,
2439 * Seq_file read operations for /smack/load-self2
2442 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2444 struct task_smack *tsp = current_security();
2446 return smk_seq_start(s, pos, &tsp->smk_rules);
2449 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2451 struct task_smack *tsp = current_security();
2453 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2456 static int load_self2_seq_show(struct seq_file *s, void *v)
2458 struct list_head *list = v;
2459 struct smack_rule *srp =
2460 list_entry_rcu(list, struct smack_rule, list);
2462 smk_rule_show(s, srp, SMK_LONGLABEL);
2467 static const struct seq_operations load_self2_seq_ops = {
2468 .start = load_self2_seq_start,
2469 .next = load_self2_seq_next,
2470 .show = load_self2_seq_show,
2471 .stop = smk_seq_stop,
2475 * smk_open_load_self2 - open() for /smack/load-self2
2476 * @inode: inode structure representing file
2477 * @file: "load" file pointer
2479 * For reading, use load_seq_* seq_file reading operations.
2481 static int smk_open_load_self2(struct inode *inode, struct file *file)
2483 return seq_open(file, &load_self2_seq_ops);
2487 * smk_write_load_self2 - write() for /smack/load-self2
2488 * @file: file pointer, not actually used
2489 * @buf: where to get the data from
2490 * @count: bytes sent
2491 * @ppos: where to start - must be 0
2494 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2495 size_t count, loff_t *ppos)
2497 struct task_smack *tsp = current_security();
2499 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2500 &tsp->smk_rules_lock, SMK_LONG_FMT);
2503 static const struct file_operations smk_load_self2_ops = {
2504 .open = smk_open_load_self2,
2506 .llseek = seq_lseek,
2507 .write = smk_write_load_self2,
2508 .release = seq_release,
2512 * smk_write_access2 - handle access check transaction
2513 * @file: file pointer
2514 * @buf: data from user space
2515 * @count: bytes sent
2516 * @ppos: where to start - must be 0
2518 static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2519 size_t count, loff_t *ppos)
2521 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2524 static const struct file_operations smk_access2_ops = {
2525 .write = smk_write_access2,
2526 .read = simple_transaction_read,
2527 .release = simple_transaction_release,
2528 .llseek = generic_file_llseek,
2532 * smk_write_revoke_subj - write() for /smack/revoke-subject
2533 * @file: file pointer
2534 * @buf: data from user space
2535 * @count: bytes sent
2536 * @ppos: where to start - must be 0
2538 static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2539 size_t count, loff_t *ppos)
2543 struct smack_known *skp;
2544 struct smack_rule *sp;
2545 struct list_head *rule_list;
2546 struct mutex *rule_lock;
2552 if (!smack_privileged(CAP_MAC_ADMIN))
2555 if (count == 0 || count > SMK_LONGLABEL)
2558 data = memdup_user(buf, count);
2560 return PTR_ERR(data);
2562 cp = smk_parse_smack(data, count);
2568 skp = smk_find_entry(cp);
2572 rule_list = &skp->smk_rules;
2573 rule_lock = &skp->smk_rules_lock;
2575 mutex_lock(rule_lock);
2577 list_for_each_entry_rcu(sp, rule_list, list)
2580 mutex_unlock(rule_lock);
2590 static const struct file_operations smk_revoke_subj_ops = {
2591 .write = smk_write_revoke_subj,
2592 .read = simple_transaction_read,
2593 .release = simple_transaction_release,
2594 .llseek = generic_file_llseek,
2598 * smk_init_sysfs - initialize /sys/fs/smackfs
2601 static int smk_init_sysfs(void)
2603 return sysfs_create_mount_point(fs_kobj, "smackfs");
2607 * smk_write_change_rule - write() for /smack/change-rule
2608 * @file: file pointer
2609 * @buf: data from user space
2610 * @count: bytes sent
2611 * @ppos: where to start - must be 0
2613 static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2614 size_t count, loff_t *ppos)
2617 * Must have privilege.
2619 if (!smack_privileged(CAP_MAC_ADMIN))
2622 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2626 static const struct file_operations smk_change_rule_ops = {
2627 .write = smk_write_change_rule,
2628 .read = simple_transaction_read,
2629 .release = simple_transaction_release,
2630 .llseek = generic_file_llseek,
2634 * smk_read_syslog - read() for smackfs/syslog
2635 * @filp: file pointer, not actually used
2636 * @buf: where to put the result
2637 * @cn: maximum to send along
2638 * @ppos: where to start
2640 * Returns number of bytes read or error code, as appropriate
2642 static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2643 size_t cn, loff_t *ppos)
2645 struct smack_known *skp;
2646 ssize_t rc = -EINVAL;
2652 if (smack_syslog_label == NULL)
2653 skp = &smack_known_star;
2655 skp = smack_syslog_label;
2657 asize = strlen(skp->smk_known) + 1;
2660 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2667 * smk_write_syslog - write() for smackfs/syslog
2668 * @file: file pointer, not actually used
2669 * @buf: where to get the data from
2670 * @count: bytes sent
2671 * @ppos: where to start
2673 * Returns number of bytes written or error code, as appropriate
2675 static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2676 size_t count, loff_t *ppos)
2679 struct smack_known *skp;
2682 if (!smack_privileged(CAP_MAC_ADMIN))
2685 /* Enough data must be present */
2686 if (count == 0 || count > PAGE_SIZE)
2689 data = memdup_user_nul(buf, count);
2691 return PTR_ERR(data);
2693 skp = smk_import_entry(data, count);
2697 smack_syslog_label = skp;
2703 static const struct file_operations smk_syslog_ops = {
2704 .read = smk_read_syslog,
2705 .write = smk_write_syslog,
2706 .llseek = default_llseek,
2710 * Seq_file read operations for /smack/relabel-self
2713 static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2715 struct task_smack *tsp = current_security();
2717 return smk_seq_start(s, pos, &tsp->smk_relabel);
2720 static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2722 struct task_smack *tsp = current_security();
2724 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2727 static int relabel_self_seq_show(struct seq_file *s, void *v)
2729 struct list_head *list = v;
2730 struct smack_known_list_elem *sklep =
2731 list_entry(list, struct smack_known_list_elem, list);
2733 seq_puts(s, sklep->smk_label->smk_known);
2739 static const struct seq_operations relabel_self_seq_ops = {
2740 .start = relabel_self_seq_start,
2741 .next = relabel_self_seq_next,
2742 .show = relabel_self_seq_show,
2743 .stop = smk_seq_stop,
2747 * smk_open_relabel_self - open() for /smack/relabel-self
2748 * @inode: inode structure representing file
2749 * @file: "relabel-self" file pointer
2751 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2754 static int smk_open_relabel_self(struct inode *inode, struct file *file)
2756 return seq_open(file, &relabel_self_seq_ops);
2760 * smk_write_relabel_self - write() for /smack/relabel-self
2761 * @file: file pointer, not actually used
2762 * @buf: where to get the data from
2763 * @count: bytes sent
2764 * @ppos: where to start - must be 0
2767 static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2768 size_t count, loff_t *ppos)
2772 LIST_HEAD(list_tmp);
2775 * Must have privilege.
2777 if (!smack_privileged(CAP_MAC_ADMIN))
2782 * Enough data must be present.
2786 if (count == 0 || count > PAGE_SIZE)
2789 data = memdup_user_nul(buf, count);
2791 return PTR_ERR(data);
2793 rc = smk_parse_label_list(data, &list_tmp);
2796 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2798 struct task_smack *tsp;
2800 new = prepare_creds();
2805 tsp = new->security;
2806 smk_destroy_label_list(&tsp->smk_relabel);
2807 list_splice(&list_tmp, &tsp->smk_relabel);
2812 smk_destroy_label_list(&list_tmp);
2816 static const struct file_operations smk_relabel_self_ops = {
2817 .open = smk_open_relabel_self,
2819 .llseek = seq_lseek,
2820 .write = smk_write_relabel_self,
2821 .release = seq_release,
2825 * smk_read_ptrace - read() for /smack/ptrace
2826 * @filp: file pointer, not actually used
2827 * @buf: where to put the result
2828 * @count: maximum to send along
2829 * @ppos: where to start
2831 * Returns number of bytes read or error code, as appropriate
2833 static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2834 size_t count, loff_t *ppos)
2842 sprintf(temp, "%d\n", smack_ptrace_rule);
2843 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2848 * smk_write_ptrace - write() for /smack/ptrace
2849 * @file: file pointer
2850 * @buf: data from user space
2851 * @count: bytes sent
2852 * @ppos: where to start - must be 0
2854 static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2855 size_t count, loff_t *ppos)
2860 if (!smack_privileged(CAP_MAC_ADMIN))
2863 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2866 if (copy_from_user(temp, buf, count) != 0)
2871 if (sscanf(temp, "%d", &i) != 1)
2873 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2875 smack_ptrace_rule = i;
2880 static const struct file_operations smk_ptrace_ops = {
2881 .write = smk_write_ptrace,
2882 .read = smk_read_ptrace,
2883 .llseek = default_llseek,
2887 * smk_fill_super - fill the smackfs superblock
2888 * @sb: the empty superblock
2892 * Fill in the well known entries for the smack filesystem
2894 * Returns 0 on success, an error code on failure
2896 static int smk_fill_super(struct super_block *sb, void *data, int silent)
2899 struct inode *root_inode;
2901 static const struct tree_descr smack_files[] = {
2903 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2905 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2907 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2909 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2911 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2913 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2915 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2917 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2919 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2921 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2923 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2925 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2926 [SMK_LOAD_SELF2] = {
2927 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2929 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2931 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2932 [SMK_REVOKE_SUBJ] = {
2933 "revoke-subject", &smk_revoke_subj_ops,
2935 [SMK_CHANGE_RULE] = {
2936 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2938 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2940 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2941 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2942 [SMK_UNCONFINED] = {
2943 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2945 #if IS_ENABLED(CONFIG_IPV6)
2947 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2948 #endif /* CONFIG_IPV6 */
2949 [SMK_RELABEL_SELF] = {
2950 "relabel-self", &smk_relabel_self_ops,
2956 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2958 printk(KERN_ERR "%s failed %d while creating inodes\n",
2963 root_inode = d_inode(sb->s_root);
2969 * smk_mount - get the smackfs superblock
2970 * @fs_type: passed along without comment
2971 * @flags: passed along without comment
2972 * @dev_name: passed along without comment
2973 * @data: passed along without comment
2975 * Just passes everything along.
2977 * Returns what the lower level code does.
2979 static struct dentry *smk_mount(struct file_system_type *fs_type,
2980 int flags, const char *dev_name, void *data)
2982 return mount_single(fs_type, flags, data, smk_fill_super);
2985 static struct file_system_type smk_fs_type = {
2988 .kill_sb = kill_litter_super,
2991 static struct vfsmount *smackfs_mount;
2993 static int __init smk_preset_netlabel(struct smack_known *skp)
2995 skp->smk_netlabel.domain = skp->smk_known;
2996 skp->smk_netlabel.flags =
2997 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2998 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2999 &skp->smk_netlabel, strlen(skp->smk_known));
3003 * init_smk_fs - get the smackfs superblock
3005 * register the smackfs
3007 * Do not register smackfs if Smack wasn't enabled
3008 * on boot. We can not put this method normally under the
3009 * smack_init() code path since the security subsystem get
3010 * initialized before the vfs caches.
3012 * Returns true if we were not chosen on boot or if
3013 * we were chosen and filesystem registration succeeded.
3015 static int __init init_smk_fs(void)
3020 if (smack_enabled == 0)
3023 err = smk_init_sysfs();
3025 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3027 err = register_filesystem(&smk_fs_type);
3029 smackfs_mount = kern_mount(&smk_fs_type);
3030 if (IS_ERR(smackfs_mount)) {
3031 printk(KERN_ERR "smackfs: could not mount!\n");
3032 err = PTR_ERR(smackfs_mount);
3033 smackfs_mount = NULL;
3038 smk_unlbl_ambient(NULL);
3040 rc = smk_preset_netlabel(&smack_known_floor);
3041 if (err == 0 && rc < 0)
3043 rc = smk_preset_netlabel(&smack_known_hat);
3044 if (err == 0 && rc < 0)
3046 rc = smk_preset_netlabel(&smack_known_huh);
3047 if (err == 0 && rc < 0)
3049 rc = smk_preset_netlabel(&smack_known_star);
3050 if (err == 0 && rc < 0)
3052 rc = smk_preset_netlabel(&smack_known_web);
3053 if (err == 0 && rc < 0)
3059 __initcall(init_smk_fs);