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 | __GFP_NOFAIL);
697 doip->map.std = NULL;
698 doip->doi = smk_cipso_doi_value;
699 doip->type = CIPSO_V4_MAP_PASS;
700 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
701 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
702 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
704 rc = netlbl_cfg_cipsov4_add(doip, &nai);
706 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
707 __func__, __LINE__, rc);
711 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
713 printk(KERN_WARNING "%s:%d map add rc = %d\n",
714 __func__, __LINE__, rc);
715 netlbl_cfg_cipsov4_del(doip->doi, &nai);
721 * smk_unlbl_ambient - initialize the unlabeled domain
722 * @oldambient: previous domain string
724 static void smk_unlbl_ambient(char *oldambient)
727 struct netlbl_audit nai;
729 smk_netlabel_audit_set(&nai);
731 if (oldambient != NULL) {
732 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
734 printk(KERN_WARNING "%s:%d remove rc = %d\n",
735 __func__, __LINE__, rc);
737 if (smack_net_ambient == NULL)
738 smack_net_ambient = &smack_known_floor;
740 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
743 printk(KERN_WARNING "%s:%d add rc = %d\n",
744 __func__, __LINE__, rc);
748 * Seq_file read operations for /smack/cipso
751 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
753 return smk_seq_start(s, pos, &smack_known_list);
756 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
758 return smk_seq_next(s, v, pos, &smack_known_list);
762 * Print cipso labels in format:
763 * label level[/cat[,cat]]
765 static int cipso_seq_show(struct seq_file *s, void *v)
767 struct list_head *list = v;
768 struct smack_known *skp =
769 list_entry_rcu(list, struct smack_known, list);
770 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
775 * Don't show a label that could not have been set using
776 * /smack/cipso. This is in support of the notion that
777 * anything read from /smack/cipso ought to be writeable
780 * /smack/cipso2 should be used instead.
782 if (strlen(skp->smk_known) >= SMK_LABELLEN)
785 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
787 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
788 i = netlbl_catmap_walk(cmp, i + 1)) {
789 seq_printf(s, "%c%d", sep, i);
798 static const struct seq_operations cipso_seq_ops = {
799 .start = cipso_seq_start,
800 .next = cipso_seq_next,
801 .show = cipso_seq_show,
802 .stop = smk_seq_stop,
806 * smk_open_cipso - open() for /smack/cipso
807 * @inode: inode structure representing file
808 * @file: "cipso" file pointer
810 * Connect our cipso_seq_* operations with /smack/cipso
813 static int smk_open_cipso(struct inode *inode, struct file *file)
815 return seq_open(file, &cipso_seq_ops);
819 * smk_set_cipso - do the work for write() for cipso and cipso2
820 * @file: file pointer, not actually used
821 * @buf: where to get the data from
823 * @ppos: where to start
824 * @format: /smack/cipso or /smack/cipso2
826 * Accepts only one cipso rule per write call.
827 * Returns number of bytes written or error code, as appropriate
829 static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
830 size_t count, loff_t *ppos, int format)
832 struct netlbl_lsm_catmap *old_cat;
833 struct smack_known *skp;
834 struct netlbl_lsm_secattr ncats;
835 char mapcatset[SMK_CIPSOLEN];
839 ssize_t rc = -EINVAL;
846 * Must have privilege.
848 * Enough data must be present.
850 if (!smack_privileged(CAP_MAC_ADMIN))
854 if (format == SMK_FIXED24_FMT &&
855 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
857 if (count > PAGE_SIZE)
860 data = memdup_user_nul(buf, count);
862 return PTR_ERR(data);
866 * Only allow one writer at a time. Writes should be
867 * quite rare and small in any case.
869 mutex_lock(&smack_cipso_lock);
871 skp = smk_import_entry(rule, 0);
877 if (format == SMK_FIXED24_FMT)
878 rule += SMK_LABELLEN;
880 rule += strlen(skp->smk_known) + 1;
882 if (rule > data + count) {
887 ret = sscanf(rule, "%d", &maplevel);
888 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
891 rule += SMK_DIGITLEN;
892 if (rule > data + count) {
897 ret = sscanf(rule, "%d", &catlen);
898 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
901 if (format == SMK_FIXED24_FMT &&
902 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
905 memset(mapcatset, 0, sizeof(mapcatset));
907 for (i = 0; i < catlen; i++) {
908 rule += SMK_DIGITLEN;
909 if (rule > data + count) {
913 ret = sscanf(rule, "%u", &cat);
914 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
917 smack_catset_bit(cat, mapcatset);
920 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
922 old_cat = skp->smk_netlabel.attr.mls.cat;
923 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
924 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
926 netlbl_catmap_free(old_cat);
931 mutex_unlock(&smack_cipso_lock);
937 * smk_write_cipso - write() for /smack/cipso
938 * @file: file pointer, not actually used
939 * @buf: where to get the data from
941 * @ppos: where to start
943 * Accepts only one cipso rule per write call.
944 * Returns number of bytes written or error code, as appropriate
946 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
947 size_t count, loff_t *ppos)
949 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
952 static const struct file_operations smk_cipso_ops = {
953 .open = smk_open_cipso,
956 .write = smk_write_cipso,
957 .release = seq_release,
961 * Seq_file read operations for /smack/cipso2
965 * Print cipso labels in format:
966 * label level[/cat[,cat]]
968 static int cipso2_seq_show(struct seq_file *s, void *v)
970 struct list_head *list = v;
971 struct smack_known *skp =
972 list_entry_rcu(list, struct smack_known, list);
973 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
977 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
979 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
980 i = netlbl_catmap_walk(cmp, i + 1)) {
981 seq_printf(s, "%c%d", sep, i);
990 static const struct seq_operations cipso2_seq_ops = {
991 .start = cipso_seq_start,
992 .next = cipso_seq_next,
993 .show = cipso2_seq_show,
994 .stop = smk_seq_stop,
998 * smk_open_cipso2 - open() for /smack/cipso2
999 * @inode: inode structure representing file
1000 * @file: "cipso2" file pointer
1002 * Connect our cipso_seq_* operations with /smack/cipso2
1005 static int smk_open_cipso2(struct inode *inode, struct file *file)
1007 return seq_open(file, &cipso2_seq_ops);
1011 * smk_write_cipso2 - write() for /smack/cipso2
1012 * @file: file pointer, not actually used
1013 * @buf: where to get the data from
1014 * @count: bytes sent
1015 * @ppos: where to start
1017 * Accepts only one cipso rule per write call.
1018 * Returns number of bytes written or error code, as appropriate
1020 static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1021 size_t count, loff_t *ppos)
1023 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1026 static const struct file_operations smk_cipso2_ops = {
1027 .open = smk_open_cipso2,
1029 .llseek = seq_lseek,
1030 .write = smk_write_cipso2,
1031 .release = seq_release,
1035 * Seq_file read operations for /smack/netlabel
1038 static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1040 return smk_seq_start(s, pos, &smk_net4addr_list);
1043 static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1045 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1049 * Print host/label pairs
1051 static int net4addr_seq_show(struct seq_file *s, void *v)
1053 struct list_head *list = v;
1054 struct smk_net4addr *skp =
1055 list_entry_rcu(list, struct smk_net4addr, list);
1056 char *kp = SMACK_CIPSO_OPTION;
1058 if (skp->smk_label != NULL)
1059 kp = skp->smk_label->smk_known;
1060 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1061 skp->smk_masks, kp);
1066 static const struct seq_operations net4addr_seq_ops = {
1067 .start = net4addr_seq_start,
1068 .next = net4addr_seq_next,
1069 .show = net4addr_seq_show,
1070 .stop = smk_seq_stop,
1074 * smk_open_net4addr - open() for /smack/netlabel
1075 * @inode: inode structure representing file
1076 * @file: "netlabel" file pointer
1078 * Connect our net4addr_seq_* operations with /smack/netlabel
1081 static int smk_open_net4addr(struct inode *inode, struct file *file)
1083 return seq_open(file, &net4addr_seq_ops);
1087 * smk_net4addr_insert
1088 * @new : netlabel to insert
1090 * This helper insert netlabel in the smack_net4addrs list
1091 * sorted by netmask length (longest to smallest)
1092 * locked by &smk_net4addr_lock in smk_write_net4addr
1095 static void smk_net4addr_insert(struct smk_net4addr *new)
1097 struct smk_net4addr *m;
1098 struct smk_net4addr *m_next;
1100 if (list_empty(&smk_net4addr_list)) {
1101 list_add_rcu(&new->list, &smk_net4addr_list);
1105 m = list_entry_rcu(smk_net4addr_list.next,
1106 struct smk_net4addr, list);
1108 /* the comparison '>' is a bit hacky, but works */
1109 if (new->smk_masks > m->smk_masks) {
1110 list_add_rcu(&new->list, &smk_net4addr_list);
1114 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1115 if (list_is_last(&m->list, &smk_net4addr_list)) {
1116 list_add_rcu(&new->list, &m->list);
1119 m_next = list_entry_rcu(m->list.next,
1120 struct smk_net4addr, list);
1121 if (new->smk_masks > m_next->smk_masks) {
1122 list_add_rcu(&new->list, &m->list);
1130 * smk_write_net4addr - write() for /smack/netlabel
1131 * @file: file pointer, not actually used
1132 * @buf: where to get the data from
1133 * @count: bytes sent
1134 * @ppos: where to start
1136 * Accepts only one net4addr per write call.
1137 * Returns number of bytes written or error code, as appropriate
1139 static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1140 size_t count, loff_t *ppos)
1142 struct smk_net4addr *snp;
1143 struct sockaddr_in newname;
1145 struct smack_known *skp = NULL;
1147 char *host = (char *)&newname.sin_addr.s_addr;
1149 struct netlbl_audit audit_info;
1150 struct in_addr mask;
1154 u32 mask_bits = (1<<31);
1159 * Must have privilege.
1160 * No partial writes.
1161 * Enough data must be present.
1162 * "<addr/mask, as a.b.c.d/e><space><label>"
1163 * "<addr, as a.b.c.d><space><label>"
1165 if (!smack_privileged(CAP_MAC_ADMIN))
1169 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1172 data = memdup_user_nul(buf, count);
1174 return PTR_ERR(data);
1176 smack = kzalloc(count + 1, GFP_KERNEL);
1177 if (smack == NULL) {
1182 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1183 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1185 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1186 &host[0], &host[1], &host[2], &host[3], smack);
1194 if (masks > BEBITS) {
1200 * If smack begins with '-', it is an option, don't import it
1202 if (smack[0] != '-') {
1203 skp = smk_import_entry(smack, 0);
1210 * Only the -CIPSO option is supported for IPv4
1212 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1218 for (m = masks, temp_mask = 0; m > 0; m--) {
1219 temp_mask |= mask_bits;
1222 mask.s_addr = cpu_to_be32(temp_mask);
1224 newname.sin_addr.s_addr &= mask.s_addr;
1226 * Only allow one writer at a time. Writes should be
1227 * quite rare and small in any case.
1229 mutex_lock(&smk_net4addr_lock);
1231 nsa = newname.sin_addr.s_addr;
1232 /* try to find if the prefix is already in the list */
1234 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1235 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1240 smk_netlabel_audit_set(&audit_info);
1243 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1248 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1249 snp->smk_mask.s_addr = mask.s_addr;
1250 snp->smk_label = skp;
1251 snp->smk_masks = masks;
1252 smk_net4addr_insert(snp);
1256 * Delete the unlabeled entry, only if the previous label
1257 * wasn't the special CIPSO option
1259 if (snp->smk_label != NULL)
1260 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1261 &snp->smk_host, &snp->smk_mask,
1262 PF_INET, &audit_info);
1265 snp->smk_label = skp;
1269 * Now tell netlabel about the single label nature of
1270 * this host so that incoming packets get labeled.
1271 * but only if we didn't get the special CIPSO option
1273 if (rc == 0 && skp != NULL)
1274 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1275 &snp->smk_host, &snp->smk_mask, PF_INET,
1276 snp->smk_label->smk_secid, &audit_info);
1281 mutex_unlock(&smk_net4addr_lock);
1291 static const struct file_operations smk_net4addr_ops = {
1292 .open = smk_open_net4addr,
1294 .llseek = seq_lseek,
1295 .write = smk_write_net4addr,
1296 .release = seq_release,
1299 #if IS_ENABLED(CONFIG_IPV6)
1301 * Seq_file read operations for /smack/netlabel6
1304 static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1306 return smk_seq_start(s, pos, &smk_net6addr_list);
1309 static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1311 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1315 * Print host/label pairs
1317 static int net6addr_seq_show(struct seq_file *s, void *v)
1319 struct list_head *list = v;
1320 struct smk_net6addr *skp =
1321 list_entry(list, struct smk_net6addr, list);
1323 if (skp->smk_label != NULL)
1324 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1325 skp->smk_label->smk_known);
1330 static const struct seq_operations net6addr_seq_ops = {
1331 .start = net6addr_seq_start,
1332 .next = net6addr_seq_next,
1333 .show = net6addr_seq_show,
1334 .stop = smk_seq_stop,
1338 * smk_open_net6addr - open() for /smack/netlabel
1339 * @inode: inode structure representing file
1340 * @file: "netlabel" file pointer
1342 * Connect our net6addr_seq_* operations with /smack/netlabel
1345 static int smk_open_net6addr(struct inode *inode, struct file *file)
1347 return seq_open(file, &net6addr_seq_ops);
1351 * smk_net6addr_insert
1352 * @new : entry to insert
1354 * This inserts an entry in the smack_net6addrs list
1355 * sorted by netmask length (longest to smallest)
1356 * locked by &smk_net6addr_lock in smk_write_net6addr
1359 static void smk_net6addr_insert(struct smk_net6addr *new)
1361 struct smk_net6addr *m_next;
1362 struct smk_net6addr *m;
1364 if (list_empty(&smk_net6addr_list)) {
1365 list_add_rcu(&new->list, &smk_net6addr_list);
1369 m = list_entry_rcu(smk_net6addr_list.next,
1370 struct smk_net6addr, list);
1372 if (new->smk_masks > m->smk_masks) {
1373 list_add_rcu(&new->list, &smk_net6addr_list);
1377 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1378 if (list_is_last(&m->list, &smk_net6addr_list)) {
1379 list_add_rcu(&new->list, &m->list);
1382 m_next = list_entry_rcu(m->list.next,
1383 struct smk_net6addr, list);
1384 if (new->smk_masks > m_next->smk_masks) {
1385 list_add_rcu(&new->list, &m->list);
1393 * smk_write_net6addr - write() for /smack/netlabel
1394 * @file: file pointer, not actually used
1395 * @buf: where to get the data from
1396 * @count: bytes sent
1397 * @ppos: where to start
1399 * Accepts only one net6addr per write call.
1400 * Returns number of bytes written or error code, as appropriate
1402 static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1403 size_t count, loff_t *ppos)
1405 struct smk_net6addr *snp;
1406 struct in6_addr newname;
1407 struct in6_addr fullmask;
1408 struct smack_known *skp = NULL;
1414 unsigned int scanned[8];
1416 unsigned int mask = 128;
1419 * Must have privilege.
1420 * No partial writes.
1421 * Enough data must be present.
1422 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1423 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1425 if (!smack_privileged(CAP_MAC_ADMIN))
1429 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1432 data = memdup_user_nul(buf, count);
1434 return PTR_ERR(data);
1436 smack = kzalloc(count + 1, GFP_KERNEL);
1437 if (smack == NULL) {
1442 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1443 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1444 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1447 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1448 &scanned[0], &scanned[1], &scanned[2],
1449 &scanned[3], &scanned[4], &scanned[5],
1450 &scanned[6], &scanned[7], smack);
1460 for (i = 0; i < 8; i++) {
1461 if (scanned[i] > 0xffff) {
1465 newname.s6_addr16[i] = htons(scanned[i]);
1469 * If smack begins with '-', it is an option, don't import it
1471 if (smack[0] != '-') {
1472 skp = smk_import_entry(smack, 0);
1479 * Only -DELETE is supported for IPv6
1481 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1487 for (i = 0, m = mask; i < 8; i++) {
1489 fullmask.s6_addr16[i] = 0xffff;
1492 fullmask.s6_addr16[i] = (1 << m) - 1;
1495 fullmask.s6_addr16[i] = 0;
1496 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1500 * Only allow one writer at a time. Writes should be
1501 * quite rare and small in any case.
1503 mutex_lock(&smk_net6addr_lock);
1505 * Try to find the prefix in the list
1507 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1508 if (mask != snp->smk_masks)
1510 for (found = 1, i = 0; i < 8; i++) {
1511 if (newname.s6_addr16[i] !=
1512 snp->smk_host.s6_addr16[i]) {
1521 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1525 snp->smk_host = newname;
1526 snp->smk_mask = fullmask;
1527 snp->smk_masks = mask;
1528 snp->smk_label = skp;
1529 smk_net6addr_insert(snp);
1532 snp->smk_label = skp;
1538 mutex_unlock(&smk_net6addr_lock);
1548 static const struct file_operations smk_net6addr_ops = {
1549 .open = smk_open_net6addr,
1551 .llseek = seq_lseek,
1552 .write = smk_write_net6addr,
1553 .release = seq_release,
1555 #endif /* CONFIG_IPV6 */
1558 * smk_read_doi - read() for /smack/doi
1559 * @filp: file pointer, not actually used
1560 * @buf: where to put the result
1561 * @count: maximum to send along
1562 * @ppos: where to start
1564 * Returns number of bytes read or error code, as appropriate
1566 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1567 size_t count, loff_t *ppos)
1575 sprintf(temp, "%d", smk_cipso_doi_value);
1576 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1582 * smk_write_doi - write() for /smack/doi
1583 * @file: file pointer, not actually used
1584 * @buf: where to get the data from
1585 * @count: bytes sent
1586 * @ppos: where to start
1588 * Returns number of bytes written or error code, as appropriate
1590 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1591 size_t count, loff_t *ppos)
1596 if (!smack_privileged(CAP_MAC_ADMIN))
1599 if (count >= sizeof(temp) || count == 0)
1602 if (copy_from_user(temp, buf, count) != 0)
1607 if (sscanf(temp, "%d", &i) != 1)
1610 smk_cipso_doi_value = i;
1617 static const struct file_operations smk_doi_ops = {
1618 .read = smk_read_doi,
1619 .write = smk_write_doi,
1620 .llseek = default_llseek,
1624 * smk_read_direct - read() for /smack/direct
1625 * @filp: file pointer, not actually used
1626 * @buf: where to put the result
1627 * @count: maximum to send along
1628 * @ppos: where to start
1630 * Returns number of bytes read or error code, as appropriate
1632 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1633 size_t count, loff_t *ppos)
1641 sprintf(temp, "%d", smack_cipso_direct);
1642 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1648 * smk_write_direct - write() for /smack/direct
1649 * @file: file pointer, not actually used
1650 * @buf: where to get the data from
1651 * @count: bytes sent
1652 * @ppos: where to start
1654 * Returns number of bytes written or error code, as appropriate
1656 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1657 size_t count, loff_t *ppos)
1659 struct smack_known *skp;
1663 if (!smack_privileged(CAP_MAC_ADMIN))
1666 if (count >= sizeof(temp) || count == 0)
1669 if (copy_from_user(temp, buf, count) != 0)
1674 if (sscanf(temp, "%d", &i) != 1)
1678 * Don't do anything if the value hasn't actually changed.
1679 * If it is changing reset the level on entries that were
1680 * set up to be direct when they were created.
1682 if (smack_cipso_direct != i) {
1683 mutex_lock(&smack_known_lock);
1684 list_for_each_entry_rcu(skp, &smack_known_list, list)
1685 if (skp->smk_netlabel.attr.mls.lvl ==
1687 skp->smk_netlabel.attr.mls.lvl = i;
1688 smack_cipso_direct = i;
1689 mutex_unlock(&smack_known_lock);
1695 static const struct file_operations smk_direct_ops = {
1696 .read = smk_read_direct,
1697 .write = smk_write_direct,
1698 .llseek = default_llseek,
1702 * smk_read_mapped - read() for /smack/mapped
1703 * @filp: file pointer, not actually used
1704 * @buf: where to put the result
1705 * @count: maximum to send along
1706 * @ppos: where to start
1708 * Returns number of bytes read or error code, as appropriate
1710 static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1711 size_t count, loff_t *ppos)
1719 sprintf(temp, "%d", smack_cipso_mapped);
1720 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1726 * smk_write_mapped - write() for /smack/mapped
1727 * @file: file pointer, not actually used
1728 * @buf: where to get the data from
1729 * @count: bytes sent
1730 * @ppos: where to start
1732 * Returns number of bytes written or error code, as appropriate
1734 static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1735 size_t count, loff_t *ppos)
1737 struct smack_known *skp;
1741 if (!smack_privileged(CAP_MAC_ADMIN))
1744 if (count >= sizeof(temp) || count == 0)
1747 if (copy_from_user(temp, buf, count) != 0)
1752 if (sscanf(temp, "%d", &i) != 1)
1756 * Don't do anything if the value hasn't actually changed.
1757 * If it is changing reset the level on entries that were
1758 * set up to be mapped when they were created.
1760 if (smack_cipso_mapped != i) {
1761 mutex_lock(&smack_known_lock);
1762 list_for_each_entry_rcu(skp, &smack_known_list, list)
1763 if (skp->smk_netlabel.attr.mls.lvl ==
1765 skp->smk_netlabel.attr.mls.lvl = i;
1766 smack_cipso_mapped = i;
1767 mutex_unlock(&smack_known_lock);
1773 static const struct file_operations smk_mapped_ops = {
1774 .read = smk_read_mapped,
1775 .write = smk_write_mapped,
1776 .llseek = default_llseek,
1780 * smk_read_ambient - read() for /smack/ambient
1781 * @filp: file pointer, not actually used
1782 * @buf: where to put the result
1783 * @cn: maximum to send along
1784 * @ppos: where to start
1786 * Returns number of bytes read or error code, as appropriate
1788 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1789 size_t cn, loff_t *ppos)
1797 * Being careful to avoid a problem in the case where
1798 * smack_net_ambient gets changed in midstream.
1800 mutex_lock(&smack_ambient_lock);
1802 asize = strlen(smack_net_ambient->smk_known) + 1;
1805 rc = simple_read_from_buffer(buf, cn, ppos,
1806 smack_net_ambient->smk_known,
1811 mutex_unlock(&smack_ambient_lock);
1817 * smk_write_ambient - write() for /smack/ambient
1818 * @file: file pointer, not actually used
1819 * @buf: where to get the data from
1820 * @count: bytes sent
1821 * @ppos: where to start
1823 * Returns number of bytes written or error code, as appropriate
1825 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1826 size_t count, loff_t *ppos)
1828 struct smack_known *skp;
1833 if (!smack_privileged(CAP_MAC_ADMIN))
1836 /* Enough data must be present */
1837 if (count == 0 || count > PAGE_SIZE)
1840 data = memdup_user_nul(buf, count);
1842 return PTR_ERR(data);
1844 skp = smk_import_entry(data, count);
1850 mutex_lock(&smack_ambient_lock);
1852 oldambient = smack_net_ambient->smk_known;
1853 smack_net_ambient = skp;
1854 smk_unlbl_ambient(oldambient);
1856 mutex_unlock(&smack_ambient_lock);
1863 static const struct file_operations smk_ambient_ops = {
1864 .read = smk_read_ambient,
1865 .write = smk_write_ambient,
1866 .llseek = default_llseek,
1870 * Seq_file operations for /smack/onlycap
1872 static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1874 return smk_seq_start(s, pos, &smack_onlycap_list);
1877 static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1879 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1882 static int onlycap_seq_show(struct seq_file *s, void *v)
1884 struct list_head *list = v;
1885 struct smack_known_list_elem *sklep =
1886 list_entry_rcu(list, struct smack_known_list_elem, list);
1888 seq_puts(s, sklep->smk_label->smk_known);
1894 static const struct seq_operations onlycap_seq_ops = {
1895 .start = onlycap_seq_start,
1896 .next = onlycap_seq_next,
1897 .show = onlycap_seq_show,
1898 .stop = smk_seq_stop,
1901 static int smk_open_onlycap(struct inode *inode, struct file *file)
1903 return seq_open(file, &onlycap_seq_ops);
1907 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1908 * The caller must hold appropriate mutex to prevent concurrent modifications
1909 * to the public list.
1910 * Private list is assumed to be not accessible to other threads yet.
1912 * @public: public list
1913 * @private: private list
1915 static void smk_list_swap_rcu(struct list_head *public,
1916 struct list_head *private)
1918 struct list_head *first, *last;
1920 if (list_empty(public)) {
1921 list_splice_init_rcu(private, public, synchronize_rcu);
1923 /* Remember public list before replacing it */
1924 first = public->next;
1925 last = public->prev;
1927 /* Publish private list in place of public in RCU-safe way */
1928 private->prev->next = public;
1929 private->next->prev = public;
1930 rcu_assign_pointer(public->next, private->next);
1931 public->prev = private->prev;
1935 /* When all readers are done with the old public list,
1936 * attach it in place of private */
1937 private->next = first;
1938 private->prev = last;
1939 first->prev = private;
1940 last->next = private;
1945 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1947 * @data: the string to parse
1948 * @private: destination list
1950 * Returns zero on success or error code, as appropriate
1952 static int smk_parse_label_list(char *data, struct list_head *list)
1955 struct smack_known *skp;
1956 struct smack_known_list_elem *sklep;
1958 while ((tok = strsep(&data, " ")) != NULL) {
1962 skp = smk_import_entry(tok, 0);
1964 return PTR_ERR(skp);
1966 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1970 sklep->smk_label = skp;
1971 list_add(&sklep->list, list);
1978 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1979 * @head: header pointer of the list to destroy
1981 void smk_destroy_label_list(struct list_head *list)
1983 struct smack_known_list_elem *sklep;
1984 struct smack_known_list_elem *sklep2;
1986 list_for_each_entry_safe(sklep, sklep2, list, list)
1989 INIT_LIST_HEAD(list);
1993 * smk_write_onlycap - write() for smackfs/onlycap
1994 * @file: file pointer, not actually used
1995 * @buf: where to get the data from
1996 * @count: bytes sent
1997 * @ppos: where to start
1999 * Returns number of bytes written or error code, as appropriate
2001 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2002 size_t count, loff_t *ppos)
2005 LIST_HEAD(list_tmp);
2008 if (!smack_privileged(CAP_MAC_ADMIN))
2011 if (count > PAGE_SIZE)
2014 data = memdup_user_nul(buf, count);
2016 return PTR_ERR(data);
2018 rc = smk_parse_label_list(data, &list_tmp);
2022 * Clear the smack_onlycap on invalid label errors. This means
2023 * that we can pass a null string to unset the onlycap value.
2025 * Importing will also reject a label beginning with '-',
2026 * so "-usecapabilities" will also work.
2028 * But do so only on invalid label, not on system errors.
2029 * The invalid label must be first to count as clearing attempt.
2031 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2032 mutex_lock(&smack_onlycap_lock);
2033 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2034 mutex_unlock(&smack_onlycap_lock);
2038 smk_destroy_label_list(&list_tmp);
2043 static const struct file_operations smk_onlycap_ops = {
2044 .open = smk_open_onlycap,
2046 .write = smk_write_onlycap,
2047 .llseek = seq_lseek,
2048 .release = seq_release,
2051 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2053 * smk_read_unconfined - read() for smackfs/unconfined
2054 * @filp: file pointer, not actually used
2055 * @buf: where to put the result
2056 * @cn: maximum to send along
2057 * @ppos: where to start
2059 * Returns number of bytes read or error code, as appropriate
2061 static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2062 size_t cn, loff_t *ppos)
2065 ssize_t rc = -EINVAL;
2071 if (smack_unconfined != NULL)
2072 smack = smack_unconfined->smk_known;
2074 asize = strlen(smack) + 1;
2077 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2083 * smk_write_unconfined - write() for smackfs/unconfined
2084 * @file: file pointer, not actually used
2085 * @buf: where to get the data from
2086 * @count: bytes sent
2087 * @ppos: where to start
2089 * Returns number of bytes written or error code, as appropriate
2091 static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2092 size_t count, loff_t *ppos)
2095 struct smack_known *skp;
2098 if (!smack_privileged(CAP_MAC_ADMIN))
2101 if (count > PAGE_SIZE)
2104 data = memdup_user_nul(buf, count);
2106 return PTR_ERR(data);
2109 * Clear the smack_unconfined on invalid label errors. This means
2110 * that we can pass a null string to unset the unconfined value.
2112 * Importing will also reject a label beginning with '-',
2113 * so "-confine" will also work.
2115 * But do so only on invalid label, not on system errors.
2117 skp = smk_import_entry(data, count);
2118 if (PTR_ERR(skp) == -EINVAL)
2120 else if (IS_ERR(skp)) {
2125 smack_unconfined = skp;
2132 static const struct file_operations smk_unconfined_ops = {
2133 .read = smk_read_unconfined,
2134 .write = smk_write_unconfined,
2135 .llseek = default_llseek,
2137 #endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2140 * smk_read_logging - read() for /smack/logging
2141 * @filp: file pointer, not actually used
2142 * @buf: where to put the result
2143 * @cn: maximum to send along
2144 * @ppos: where to start
2146 * Returns number of bytes read or error code, as appropriate
2148 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2149 size_t count, loff_t *ppos)
2157 sprintf(temp, "%d\n", log_policy);
2158 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2163 * smk_write_logging - write() for /smack/logging
2164 * @file: file pointer, not actually used
2165 * @buf: where to get the data from
2166 * @count: bytes sent
2167 * @ppos: where to start
2169 * Returns number of bytes written or error code, as appropriate
2171 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2172 size_t count, loff_t *ppos)
2177 if (!smack_privileged(CAP_MAC_ADMIN))
2180 if (count >= sizeof(temp) || count == 0)
2183 if (copy_from_user(temp, buf, count) != 0)
2188 if (sscanf(temp, "%d", &i) != 1)
2198 static const struct file_operations smk_logging_ops = {
2199 .read = smk_read_logging,
2200 .write = smk_write_logging,
2201 .llseek = default_llseek,
2205 * Seq_file read operations for /smack/load-self
2208 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2210 struct task_smack *tsp = smack_cred(current_cred());
2212 return smk_seq_start(s, pos, &tsp->smk_rules);
2215 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2217 struct task_smack *tsp = smack_cred(current_cred());
2219 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2222 static int load_self_seq_show(struct seq_file *s, void *v)
2224 struct list_head *list = v;
2225 struct smack_rule *srp =
2226 list_entry_rcu(list, struct smack_rule, list);
2228 smk_rule_show(s, srp, SMK_LABELLEN);
2233 static const struct seq_operations load_self_seq_ops = {
2234 .start = load_self_seq_start,
2235 .next = load_self_seq_next,
2236 .show = load_self_seq_show,
2237 .stop = smk_seq_stop,
2242 * smk_open_load_self - open() for /smack/load-self2
2243 * @inode: inode structure representing file
2244 * @file: "load" file pointer
2246 * For reading, use load_seq_* seq_file reading operations.
2248 static int smk_open_load_self(struct inode *inode, struct file *file)
2250 return seq_open(file, &load_self_seq_ops);
2254 * smk_write_load_self - write() for /smack/load-self
2255 * @file: file pointer, not actually used
2256 * @buf: where to get the data from
2257 * @count: bytes sent
2258 * @ppos: where to start - must be 0
2261 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2262 size_t count, loff_t *ppos)
2264 struct task_smack *tsp = smack_cred(current_cred());
2266 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2267 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2270 static const struct file_operations smk_load_self_ops = {
2271 .open = smk_open_load_self,
2273 .llseek = seq_lseek,
2274 .write = smk_write_load_self,
2275 .release = seq_release,
2279 * smk_user_access - handle access check transaction
2280 * @file: file pointer
2281 * @buf: data from user space
2282 * @count: bytes sent
2283 * @ppos: where to start - must be 0
2285 static ssize_t smk_user_access(struct file *file, const char __user *buf,
2286 size_t count, loff_t *ppos, int format)
2288 struct smack_parsed_rule rule;
2292 data = simple_transaction_get(file, buf, count);
2294 return PTR_ERR(data);
2296 if (format == SMK_FIXED24_FMT) {
2297 if (count < SMK_LOADLEN)
2299 res = smk_parse_rule(data, &rule, 0);
2302 * simple_transaction_get() returns null-terminated data
2304 res = smk_parse_long_rule(data, &rule, 0, 3);
2308 res = smk_access(rule.smk_subject, rule.smk_object,
2309 rule.smk_access1, NULL);
2310 else if (res != -ENOENT)
2314 * smk_access() can return a value > 0 in the "bringup" case.
2316 data[0] = res >= 0 ? '1' : '0';
2319 simple_transaction_set(file, 2);
2321 if (format == SMK_FIXED24_FMT)
2327 * smk_write_access - handle access check transaction
2328 * @file: file pointer
2329 * @buf: data from user space
2330 * @count: bytes sent
2331 * @ppos: where to start - must be 0
2333 static ssize_t smk_write_access(struct file *file, const char __user *buf,
2334 size_t count, loff_t *ppos)
2336 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2339 static const struct file_operations smk_access_ops = {
2340 .write = smk_write_access,
2341 .read = simple_transaction_read,
2342 .release = simple_transaction_release,
2343 .llseek = generic_file_llseek,
2348 * Seq_file read operations for /smack/load2
2351 static int load2_seq_show(struct seq_file *s, void *v)
2353 struct list_head *list = v;
2354 struct smack_rule *srp;
2355 struct smack_known *skp =
2356 list_entry_rcu(list, struct smack_known, list);
2358 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2359 smk_rule_show(s, srp, SMK_LONGLABEL);
2364 static const struct seq_operations load2_seq_ops = {
2365 .start = load2_seq_start,
2366 .next = load2_seq_next,
2367 .show = load2_seq_show,
2368 .stop = smk_seq_stop,
2372 * smk_open_load2 - open() for /smack/load2
2373 * @inode: inode structure representing file
2374 * @file: "load2" file pointer
2376 * For reading, use load2_seq_* seq_file reading operations.
2378 static int smk_open_load2(struct inode *inode, struct file *file)
2380 return seq_open(file, &load2_seq_ops);
2384 * smk_write_load2 - write() for /smack/load2
2385 * @file: file pointer, not actually used
2386 * @buf: where to get the data from
2387 * @count: bytes sent
2388 * @ppos: where to start - must be 0
2391 static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2392 size_t count, loff_t *ppos)
2395 * Must have privilege.
2397 if (!smack_privileged(CAP_MAC_ADMIN))
2400 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2404 static const struct file_operations smk_load2_ops = {
2405 .open = smk_open_load2,
2407 .llseek = seq_lseek,
2408 .write = smk_write_load2,
2409 .release = seq_release,
2413 * Seq_file read operations for /smack/load-self2
2416 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2418 struct task_smack *tsp = smack_cred(current_cred());
2420 return smk_seq_start(s, pos, &tsp->smk_rules);
2423 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2425 struct task_smack *tsp = smack_cred(current_cred());
2427 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2430 static int load_self2_seq_show(struct seq_file *s, void *v)
2432 struct list_head *list = v;
2433 struct smack_rule *srp =
2434 list_entry_rcu(list, struct smack_rule, list);
2436 smk_rule_show(s, srp, SMK_LONGLABEL);
2441 static const struct seq_operations load_self2_seq_ops = {
2442 .start = load_self2_seq_start,
2443 .next = load_self2_seq_next,
2444 .show = load_self2_seq_show,
2445 .stop = smk_seq_stop,
2449 * smk_open_load_self2 - open() for /smack/load-self2
2450 * @inode: inode structure representing file
2451 * @file: "load" file pointer
2453 * For reading, use load_seq_* seq_file reading operations.
2455 static int smk_open_load_self2(struct inode *inode, struct file *file)
2457 return seq_open(file, &load_self2_seq_ops);
2461 * smk_write_load_self2 - write() for /smack/load-self2
2462 * @file: file pointer, not actually used
2463 * @buf: where to get the data from
2464 * @count: bytes sent
2465 * @ppos: where to start - must be 0
2468 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2469 size_t count, loff_t *ppos)
2471 struct task_smack *tsp = smack_cred(current_cred());
2473 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2474 &tsp->smk_rules_lock, SMK_LONG_FMT);
2477 static const struct file_operations smk_load_self2_ops = {
2478 .open = smk_open_load_self2,
2480 .llseek = seq_lseek,
2481 .write = smk_write_load_self2,
2482 .release = seq_release,
2486 * smk_write_access2 - handle access check transaction
2487 * @file: file pointer
2488 * @buf: data from user space
2489 * @count: bytes sent
2490 * @ppos: where to start - must be 0
2492 static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2493 size_t count, loff_t *ppos)
2495 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2498 static const struct file_operations smk_access2_ops = {
2499 .write = smk_write_access2,
2500 .read = simple_transaction_read,
2501 .release = simple_transaction_release,
2502 .llseek = generic_file_llseek,
2506 * smk_write_revoke_subj - write() for /smack/revoke-subject
2507 * @file: file pointer
2508 * @buf: data from user space
2509 * @count: bytes sent
2510 * @ppos: where to start - must be 0
2512 static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2513 size_t count, loff_t *ppos)
2517 struct smack_known *skp;
2518 struct smack_rule *sp;
2519 struct list_head *rule_list;
2520 struct mutex *rule_lock;
2526 if (!smack_privileged(CAP_MAC_ADMIN))
2529 if (count == 0 || count > SMK_LONGLABEL)
2532 data = memdup_user(buf, count);
2534 return PTR_ERR(data);
2536 cp = smk_parse_smack(data, count);
2542 skp = smk_find_entry(cp);
2546 rule_list = &skp->smk_rules;
2547 rule_lock = &skp->smk_rules_lock;
2549 mutex_lock(rule_lock);
2551 list_for_each_entry_rcu(sp, rule_list, list)
2554 mutex_unlock(rule_lock);
2564 static const struct file_operations smk_revoke_subj_ops = {
2565 .write = smk_write_revoke_subj,
2566 .read = simple_transaction_read,
2567 .release = simple_transaction_release,
2568 .llseek = generic_file_llseek,
2572 * smk_init_sysfs - initialize /sys/fs/smackfs
2575 static int smk_init_sysfs(void)
2577 return sysfs_create_mount_point(fs_kobj, "smackfs");
2581 * smk_write_change_rule - write() for /smack/change-rule
2582 * @file: file pointer
2583 * @buf: data from user space
2584 * @count: bytes sent
2585 * @ppos: where to start - must be 0
2587 static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2588 size_t count, loff_t *ppos)
2591 * Must have privilege.
2593 if (!smack_privileged(CAP_MAC_ADMIN))
2596 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2600 static const struct file_operations smk_change_rule_ops = {
2601 .write = smk_write_change_rule,
2602 .read = simple_transaction_read,
2603 .release = simple_transaction_release,
2604 .llseek = generic_file_llseek,
2608 * smk_read_syslog - read() for smackfs/syslog
2609 * @filp: file pointer, not actually used
2610 * @buf: where to put the result
2611 * @cn: maximum to send along
2612 * @ppos: where to start
2614 * Returns number of bytes read or error code, as appropriate
2616 static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2617 size_t cn, loff_t *ppos)
2619 struct smack_known *skp;
2620 ssize_t rc = -EINVAL;
2626 if (smack_syslog_label == NULL)
2627 skp = &smack_known_star;
2629 skp = smack_syslog_label;
2631 asize = strlen(skp->smk_known) + 1;
2634 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2641 * smk_write_syslog - write() for smackfs/syslog
2642 * @file: file pointer, not actually used
2643 * @buf: where to get the data from
2644 * @count: bytes sent
2645 * @ppos: where to start
2647 * Returns number of bytes written or error code, as appropriate
2649 static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2650 size_t count, loff_t *ppos)
2653 struct smack_known *skp;
2656 if (!smack_privileged(CAP_MAC_ADMIN))
2659 /* Enough data must be present */
2660 if (count == 0 || count > PAGE_SIZE)
2663 data = memdup_user_nul(buf, count);
2665 return PTR_ERR(data);
2667 skp = smk_import_entry(data, count);
2671 smack_syslog_label = skp;
2677 static const struct file_operations smk_syslog_ops = {
2678 .read = smk_read_syslog,
2679 .write = smk_write_syslog,
2680 .llseek = default_llseek,
2684 * Seq_file read operations for /smack/relabel-self
2687 static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2689 struct task_smack *tsp = smack_cred(current_cred());
2691 return smk_seq_start(s, pos, &tsp->smk_relabel);
2694 static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2696 struct task_smack *tsp = smack_cred(current_cred());
2698 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2701 static int relabel_self_seq_show(struct seq_file *s, void *v)
2703 struct list_head *list = v;
2704 struct smack_known_list_elem *sklep =
2705 list_entry(list, struct smack_known_list_elem, list);
2707 seq_puts(s, sklep->smk_label->smk_known);
2713 static const struct seq_operations relabel_self_seq_ops = {
2714 .start = relabel_self_seq_start,
2715 .next = relabel_self_seq_next,
2716 .show = relabel_self_seq_show,
2717 .stop = smk_seq_stop,
2721 * smk_open_relabel_self - open() for /smack/relabel-self
2722 * @inode: inode structure representing file
2723 * @file: "relabel-self" file pointer
2725 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2728 static int smk_open_relabel_self(struct inode *inode, struct file *file)
2730 return seq_open(file, &relabel_self_seq_ops);
2734 * smk_write_relabel_self - write() for /smack/relabel-self
2735 * @file: file pointer, not actually used
2736 * @buf: where to get the data from
2737 * @count: bytes sent
2738 * @ppos: where to start - must be 0
2741 static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2742 size_t count, loff_t *ppos)
2746 LIST_HEAD(list_tmp);
2749 * Must have privilege.
2751 if (!smack_privileged(CAP_MAC_ADMIN))
2756 * Enough data must be present.
2760 if (count == 0 || count > PAGE_SIZE)
2763 data = memdup_user_nul(buf, count);
2765 return PTR_ERR(data);
2767 rc = smk_parse_label_list(data, &list_tmp);
2770 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2772 struct task_smack *tsp;
2774 new = prepare_creds();
2779 tsp = smack_cred(new);
2780 smk_destroy_label_list(&tsp->smk_relabel);
2781 list_splice(&list_tmp, &tsp->smk_relabel);
2786 smk_destroy_label_list(&list_tmp);
2790 static const struct file_operations smk_relabel_self_ops = {
2791 .open = smk_open_relabel_self,
2793 .llseek = seq_lseek,
2794 .write = smk_write_relabel_self,
2795 .release = seq_release,
2799 * smk_read_ptrace - read() for /smack/ptrace
2800 * @filp: file pointer, not actually used
2801 * @buf: where to put the result
2802 * @count: maximum to send along
2803 * @ppos: where to start
2805 * Returns number of bytes read or error code, as appropriate
2807 static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2808 size_t count, loff_t *ppos)
2816 sprintf(temp, "%d\n", smack_ptrace_rule);
2817 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2822 * smk_write_ptrace - write() for /smack/ptrace
2823 * @file: file pointer
2824 * @buf: data from user space
2825 * @count: bytes sent
2826 * @ppos: where to start - must be 0
2828 static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2829 size_t count, loff_t *ppos)
2834 if (!smack_privileged(CAP_MAC_ADMIN))
2837 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2840 if (copy_from_user(temp, buf, count) != 0)
2845 if (sscanf(temp, "%d", &i) != 1)
2847 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2849 smack_ptrace_rule = i;
2854 static const struct file_operations smk_ptrace_ops = {
2855 .write = smk_write_ptrace,
2856 .read = smk_read_ptrace,
2857 .llseek = default_llseek,
2861 * smk_fill_super - fill the smackfs superblock
2862 * @sb: the empty superblock
2865 * Fill in the well known entries for the smack filesystem
2867 * Returns 0 on success, an error code on failure
2869 static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2873 static const struct tree_descr smack_files[] = {
2875 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2877 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2879 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2881 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2883 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2885 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2887 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2889 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2891 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2893 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2895 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2897 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2898 [SMK_LOAD_SELF2] = {
2899 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2901 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2903 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2904 [SMK_REVOKE_SUBJ] = {
2905 "revoke-subject", &smk_revoke_subj_ops,
2907 [SMK_CHANGE_RULE] = {
2908 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2910 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2912 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2913 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
2914 [SMK_UNCONFINED] = {
2915 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2917 #if IS_ENABLED(CONFIG_IPV6)
2919 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2920 #endif /* CONFIG_IPV6 */
2921 [SMK_RELABEL_SELF] = {
2922 "relabel-self", &smk_relabel_self_ops,
2928 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2930 printk(KERN_ERR "%s failed %d while creating inodes\n",
2939 * smk_get_tree - get the smackfs superblock
2940 * @fc: The mount context, including any options
2942 * Just passes everything along.
2944 * Returns what the lower level code does.
2946 static int smk_get_tree(struct fs_context *fc)
2948 return get_tree_single(fc, smk_fill_super);
2951 static const struct fs_context_operations smk_context_ops = {
2952 .get_tree = smk_get_tree,
2956 * smk_init_fs_context - Initialise a filesystem context for smackfs
2957 * @fc: The blank mount context
2959 static int smk_init_fs_context(struct fs_context *fc)
2961 fc->ops = &smk_context_ops;
2965 static struct file_system_type smk_fs_type = {
2967 .init_fs_context = smk_init_fs_context,
2968 .kill_sb = kill_litter_super,
2971 static struct vfsmount *smackfs_mount;
2973 static int __init smk_preset_netlabel(struct smack_known *skp)
2975 skp->smk_netlabel.domain = skp->smk_known;
2976 skp->smk_netlabel.flags =
2977 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2978 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2979 &skp->smk_netlabel, strlen(skp->smk_known));
2983 * init_smk_fs - get the smackfs superblock
2985 * register the smackfs
2987 * Do not register smackfs if Smack wasn't enabled
2988 * on boot. We can not put this method normally under the
2989 * smack_init() code path since the security subsystem get
2990 * initialized before the vfs caches.
2992 * Returns true if we were not chosen on boot or if
2993 * we were chosen and filesystem registration succeeded.
2995 static int __init init_smk_fs(void)
3000 if (smack_enabled == 0)
3003 err = smk_init_sysfs();
3005 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3007 err = register_filesystem(&smk_fs_type);
3009 smackfs_mount = kern_mount(&smk_fs_type);
3010 if (IS_ERR(smackfs_mount)) {
3011 printk(KERN_ERR "smackfs: could not mount!\n");
3012 err = PTR_ERR(smackfs_mount);
3013 smackfs_mount = NULL;
3018 smk_unlbl_ambient(NULL);
3020 rc = smk_preset_netlabel(&smack_known_floor);
3021 if (err == 0 && rc < 0)
3023 rc = smk_preset_netlabel(&smack_known_hat);
3024 if (err == 0 && rc < 0)
3026 rc = smk_preset_netlabel(&smack_known_huh);
3027 if (err == 0 && rc < 0)
3029 rc = smk_preset_netlabel(&smack_known_star);
3030 if (err == 0 && rc < 0)
3032 rc = smk_preset_netlabel(&smack_known_web);
3033 if (err == 0 && rc < 0)
3039 __initcall(init_smk_fs);