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.
12 * Special thanks to the authors of selinuxfs.
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>
32 * smackfs pseudo filesystem.
37 SMK_LOAD = 3, /* load policy */
38 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
39 SMK_DOI = 5, /* CIPSO DOI */
40 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
41 SMK_AMBIENT = 7, /* internet ambient label */
42 SMK_NETLBLADDR = 8, /* single label hosts */
43 SMK_ONLYCAP = 9, /* the only "capable" label */
44 SMK_LOGGING = 10, /* logging */
45 SMK_LOAD_SELF = 11, /* task specific rules */
46 SMK_ACCESSES = 12, /* access policy */
47 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
48 SMK_LOAD2 = 14, /* load policy with long labels */
49 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
50 SMK_ACCESS2 = 16, /* make an access check with long labels */
51 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
52 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
58 static DEFINE_MUTEX(smack_list_lock);
59 static DEFINE_MUTEX(smack_cipso_lock);
60 static DEFINE_MUTEX(smack_ambient_lock);
61 static DEFINE_MUTEX(smk_netlbladdr_lock);
64 * This is the "ambient" label for network traffic.
65 * If it isn't somehow marked, use this.
66 * It can be reset via smackfs/ambient
68 char *smack_net_ambient;
71 * This is the level in a CIPSO header that indicates a
72 * smack label is contained directly in the category set.
73 * It can be reset via smackfs/direct
75 int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
78 * This is the level in a CIPSO header that indicates a
79 * secid is contained directly in the category set.
80 * It can be reset via smackfs/mapped
82 int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
85 * Unless a process is running with this label even
86 * having CAP_MAC_OVERRIDE isn't enough to grant
87 * privilege to violate MAC policy. If no label is
88 * designated (the NULL case) capabilities apply to
89 * everyone. It is expected that the hat (^) label
90 * will be used if any label is used.
95 * Certain IP addresses may be designated as single label hosts.
96 * Packets are sent there unlabeled, but only from tasks that
97 * can write to the specified label.
100 LIST_HEAD(smk_netlbladdr_list);
103 * Rule lists are maintained for each label.
104 * This master list is just for reading /smack/load and /smack/load2.
106 struct smack_master_list {
107 struct list_head list;
108 struct smack_rule *smk_rule;
111 LIST_HEAD(smack_rule_list);
113 static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
115 const char *smack_cipso_option = SMACK_CIPSO_OPTION;
118 * Values for parsing cipso rules
119 * SMK_DIGITLEN: Length of a digit field in a rule.
120 * SMK_CIPSOMIN: Minimum possible cipso rule length.
121 * SMK_CIPSOMAX: Maximum possible cipso rule length.
123 #define SMK_DIGITLEN 4
124 #define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
125 #define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
128 * Values for parsing MAC rules
129 * SMK_ACCESS: Maximum possible combination of access permissions
130 * SMK_ACCESSLEN: Maximum length for a rule access field
131 * SMK_LOADLEN: Smack rule length
133 #define SMK_OACCESS "rwxa"
134 #define SMK_ACCESS "rwxat"
135 #define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
136 #define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
137 #define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
138 #define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
141 * Stricly for CIPSO level manipulation.
142 * Set the category bit number in a smack label sized buffer.
144 static inline void smack_catset_bit(unsigned int cat, char *catsetp)
146 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
149 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
153 * smk_netlabel_audit_set - fill a netlbl_audit struct
154 * @nap: structure to fill
156 static void smk_netlabel_audit_set(struct netlbl_audit *nap)
158 nap->loginuid = audit_get_loginuid(current);
159 nap->sessionid = audit_get_sessionid(current);
160 nap->secid = smack_to_secid(smk_of_current());
164 * Value for parsing single label host rules
167 #define SMK_NETLBLADDRMIN 9
170 * smk_set_access - add a rule to the rule list
171 * @srp: the new rule to add
172 * @rule_list: the list of rules
173 * @rule_lock: the rule list lock
175 * Looks through the current subject/object/access list for
176 * the subject/object pair and replaces the access that was
177 * there. If the pair isn't found add it with the specified
180 * Returns 1 if a rule was found to exist already, 0 if it is new
181 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
182 * during the allocation of the new pair to add.
184 static int smk_set_access(struct smack_rule *srp, struct list_head *rule_list,
185 struct mutex *rule_lock)
187 struct smack_rule *sp;
190 mutex_lock(rule_lock);
193 * Because the object label is less likely to match
194 * than the subject label check it first
196 list_for_each_entry_rcu(sp, rule_list, list) {
197 if (sp->smk_object == srp->smk_object &&
198 sp->smk_subject == srp->smk_subject) {
200 sp->smk_access = srp->smk_access;
205 list_add_rcu(&srp->list, rule_list);
207 mutex_unlock(rule_lock);
213 * smk_fill_rule - Fill Smack rule from strings
214 * @subject: subject label string
215 * @object: object label string
216 * @access: access string
218 * @import: if non-zero, import labels
219 * @len: label length limit
221 * Returns 0 on success, -1 on failure
223 static int smk_fill_rule(const char *subject, const char *object,
224 const char *access, struct smack_rule *rule,
228 struct smack_known *skp;
231 rule->smk_subject = smk_import(subject, len);
232 if (rule->smk_subject == NULL)
235 rule->smk_object = smk_import(object, len);
236 if (rule->smk_object == NULL)
239 cp = smk_parse_smack(subject, len);
242 skp = smk_find_entry(cp);
246 rule->smk_subject = skp->smk_known;
248 cp = smk_parse_smack(object, len);
251 skp = smk_find_entry(cp);
255 rule->smk_object = skp->smk_known;
258 rule->smk_access = 0;
260 for (cp = access; *cp != '\0'; cp++) {
266 rule->smk_access |= MAY_READ;
270 rule->smk_access |= MAY_WRITE;
274 rule->smk_access |= MAY_EXEC;
278 rule->smk_access |= MAY_APPEND;
282 rule->smk_access |= MAY_TRANSMUTE;
293 * smk_parse_rule - parse Smack rule from load string
294 * @data: string to be parsed whose size is SMK_LOADLEN
296 * @import: if non-zero, import labels
298 * Returns 0 on success, -1 on errors.
300 static int smk_parse_rule(const char *data, struct smack_rule *rule, int import)
304 rc = smk_fill_rule(data, data + SMK_LABELLEN,
305 data + SMK_LABELLEN + SMK_LABELLEN, rule, import,
311 * smk_parse_long_rule - parse Smack rule from rule string
312 * @data: string to be parsed, null terminated
314 * @import: if non-zero, import labels
316 * Returns 0 on success, -1 on failure
318 static int smk_parse_long_rule(const char *data, struct smack_rule *rule,
327 /* This is inefficient */
328 datalen = strlen(data);
330 /* Our first element can be 64 + \0 with no spaces */
331 subject = kzalloc(datalen + 1, GFP_KERNEL);
334 object = kzalloc(datalen, GFP_KERNEL);
337 access = kzalloc(datalen, GFP_KERNEL);
341 if (sscanf(data, "%s %s %s", subject, object, access) == 3)
342 rc = smk_fill_rule(subject, object, access, rule, import, 0);
352 #define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
353 #define SMK_LONG_FMT 1 /* Variable long label format */
355 * smk_write_rules_list - write() for any /smack rule file
356 * @file: file pointer, not actually used
357 * @buf: where to get the data from
359 * @ppos: where to start - must be 0
360 * @rule_list: the list of rules to write to
361 * @rule_lock: lock for the rule list
362 * @format: /smack/load or /smack/load2 format.
364 * Get one smack access rule from above.
365 * The format for SMK_LONG_FMT is:
366 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
367 * The format for SMK_FIXED24_FMT is exactly:
368 * "subject object rwxat"
370 static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
371 size_t count, loff_t *ppos,
372 struct list_head *rule_list,
373 struct mutex *rule_lock, int format)
375 struct smack_master_list *smlp;
376 struct smack_known *skp;
377 struct smack_rule *rule;
385 * Enough data must be present.
390 if (format == SMK_FIXED24_FMT) {
392 * Minor hack for backward compatibility
394 if (count != SMK_OLOADLEN && count != SMK_LOADLEN)
396 datalen = SMK_LOADLEN;
400 data = kzalloc(datalen, GFP_KERNEL);
404 if (copy_from_user(data, buf, count) != 0) {
409 rule = kzalloc(sizeof(*rule), GFP_KERNEL);
415 if (format == SMK_LONG_FMT) {
417 * Be sure the data string is terminated.
420 if (smk_parse_long_rule(data, rule, 1))
424 * More on the minor hack for backward compatibility
426 if (count == (SMK_OLOADLEN))
427 data[SMK_OLOADLEN] = '-';
428 if (smk_parse_rule(data, rule, 1))
433 if (rule_list == NULL) {
435 skp = smk_find_entry(rule->smk_subject);
436 rule_list = &skp->smk_rules;
437 rule_lock = &skp->smk_rules_lock;
442 * If this is a global as opposed to self and a new rule
443 * it needs to get added for reporting.
444 * smk_set_access returns true if there was already a rule
445 * for the subject/object pair, and false if it was new.
447 if (!smk_set_access(rule, rule_list, rule_lock)) {
449 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
451 smlp->smk_rule = rule;
452 list_add_rcu(&smlp->list, &smack_rule_list);
467 * Core logic for smackfs seq list operations.
470 static void *smk_seq_start(struct seq_file *s, loff_t *pos,
471 struct list_head *head)
473 struct list_head *list;
476 * This is 0 the first time through.
481 if (s->private == NULL)
485 if (list_empty(list))
493 static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
494 struct list_head *head)
496 struct list_head *list = v;
498 if (list_is_last(list, head)) {
502 s->private = list->next;
506 static void smk_seq_stop(struct seq_file *s, void *v)
511 static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
514 * Don't show any rules with label names too long for
515 * interface file (/smack/load or /smack/load2)
516 * because you should expect to be able to write
517 * anything you read back.
519 if (strlen(srp->smk_subject) >= max || strlen(srp->smk_object) >= max)
522 if (srp->smk_access == 0)
525 seq_printf(s, "%s %s", srp->smk_subject, srp->smk_object);
529 if (srp->smk_access & MAY_READ)
531 if (srp->smk_access & MAY_WRITE)
533 if (srp->smk_access & MAY_EXEC)
535 if (srp->smk_access & MAY_APPEND)
537 if (srp->smk_access & MAY_TRANSMUTE)
544 * Seq_file read operations for /smack/load
547 static void *load2_seq_start(struct seq_file *s, loff_t *pos)
549 return smk_seq_start(s, pos, &smack_rule_list);
552 static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
554 return smk_seq_next(s, v, pos, &smack_rule_list);
557 static int load_seq_show(struct seq_file *s, void *v)
559 struct list_head *list = v;
560 struct smack_master_list *smlp =
561 list_entry(list, struct smack_master_list, list);
563 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
568 static const struct seq_operations load_seq_ops = {
569 .start = load2_seq_start,
570 .next = load2_seq_next,
571 .show = load_seq_show,
572 .stop = smk_seq_stop,
576 * smk_open_load - open() for /smack/load
577 * @inode: inode structure representing file
578 * @file: "load" file pointer
580 * For reading, use load_seq_* seq_file reading operations.
582 static int smk_open_load(struct inode *inode, struct file *file)
584 return seq_open(file, &load_seq_ops);
588 * smk_write_load - write() for /smack/load
589 * @file: file pointer, not actually used
590 * @buf: where to get the data from
592 * @ppos: where to start - must be 0
595 static ssize_t smk_write_load(struct file *file, const char __user *buf,
596 size_t count, loff_t *ppos)
599 * Must have privilege.
601 * Enough data must be present.
603 if (!smack_privileged(CAP_MAC_ADMIN))
606 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
610 static const struct file_operations smk_load_ops = {
611 .open = smk_open_load,
614 .write = smk_write_load,
615 .release = seq_release,
619 * smk_cipso_doi - initialize the CIPSO domain
621 static void smk_cipso_doi(void)
624 struct cipso_v4_doi *doip;
625 struct netlbl_audit nai;
627 smk_netlabel_audit_set(&nai);
629 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
631 printk(KERN_WARNING "%s:%d remove rc = %d\n",
632 __func__, __LINE__, rc);
634 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
636 panic("smack: Failed to initialize cipso DOI.\n");
637 doip->map.std = NULL;
638 doip->doi = smk_cipso_doi_value;
639 doip->type = CIPSO_V4_MAP_PASS;
640 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
641 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
642 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
644 rc = netlbl_cfg_cipsov4_add(doip, &nai);
646 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
647 __func__, __LINE__, rc);
651 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
653 printk(KERN_WARNING "%s:%d map add rc = %d\n",
654 __func__, __LINE__, rc);
661 * smk_unlbl_ambient - initialize the unlabeled domain
662 * @oldambient: previous domain string
664 static void smk_unlbl_ambient(char *oldambient)
667 struct netlbl_audit nai;
669 smk_netlabel_audit_set(&nai);
671 if (oldambient != NULL) {
672 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
674 printk(KERN_WARNING "%s:%d remove rc = %d\n",
675 __func__, __LINE__, rc);
677 if (smack_net_ambient == NULL)
678 smack_net_ambient = smack_known_floor.smk_known;
680 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient, PF_INET,
683 printk(KERN_WARNING "%s:%d add rc = %d\n",
684 __func__, __LINE__, rc);
688 * Seq_file read operations for /smack/cipso
691 static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
693 return smk_seq_start(s, pos, &smack_known_list);
696 static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
698 return smk_seq_next(s, v, pos, &smack_known_list);
702 * Print cipso labels in format:
703 * label level[/cat[,cat]]
705 static int cipso_seq_show(struct seq_file *s, void *v)
707 struct list_head *list = v;
708 struct smack_known *skp =
709 list_entry(list, struct smack_known, list);
710 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
715 * Don't show a label that could not have been set using
716 * /smack/cipso. This is in support of the notion that
717 * anything read from /smack/cipso ought to be writeable
720 * /smack/cipso2 should be used instead.
722 if (strlen(skp->smk_known) >= SMK_LABELLEN)
725 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
727 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
728 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
729 seq_printf(s, "%c%d", sep, i);
738 static const struct seq_operations cipso_seq_ops = {
739 .start = cipso_seq_start,
740 .next = cipso_seq_next,
741 .show = cipso_seq_show,
742 .stop = smk_seq_stop,
746 * smk_open_cipso - open() for /smack/cipso
747 * @inode: inode structure representing file
748 * @file: "cipso" file pointer
750 * Connect our cipso_seq_* operations with /smack/cipso
753 static int smk_open_cipso(struct inode *inode, struct file *file)
755 return seq_open(file, &cipso_seq_ops);
759 * smk_set_cipso - do the work for write() for cipso and cipso2
760 * @file: file pointer, not actually used
761 * @buf: where to get the data from
763 * @ppos: where to start
764 * @format: /smack/cipso or /smack/cipso2
766 * Accepts only one cipso rule per write call.
767 * Returns number of bytes written or error code, as appropriate
769 static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
770 size_t count, loff_t *ppos, int format)
772 struct smack_known *skp;
773 struct netlbl_lsm_secattr ncats;
774 char mapcatset[SMK_CIPSOLEN];
778 ssize_t rc = -EINVAL;
785 * Must have privilege.
787 * Enough data must be present.
789 if (!smack_privileged(CAP_MAC_ADMIN))
793 if (format == SMK_FIXED24_FMT &&
794 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
797 data = kzalloc(count + 1, GFP_KERNEL);
801 if (copy_from_user(data, buf, count) != 0) {
809 * Only allow one writer at a time. Writes should be
810 * quite rare and small in any case.
812 mutex_lock(&smack_cipso_lock);
814 skp = smk_import_entry(rule, 0);
818 if (format == SMK_FIXED24_FMT)
819 rule += SMK_LABELLEN;
821 rule += strlen(skp->smk_known);
823 ret = sscanf(rule, "%d", &maplevel);
824 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
827 rule += SMK_DIGITLEN;
828 ret = sscanf(rule, "%d", &catlen);
829 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
832 if (format == SMK_FIXED24_FMT &&
833 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
836 memset(mapcatset, 0, sizeof(mapcatset));
838 for (i = 0; i < catlen; i++) {
839 rule += SMK_DIGITLEN;
840 ret = sscanf(rule, "%u", &cat);
841 if (ret != 1 || cat > SMACK_CIPSO_MAXCATVAL)
844 smack_catset_bit(cat, mapcatset);
847 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
849 netlbl_secattr_catmap_free(skp->smk_netlabel.attr.mls.cat);
850 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
851 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
856 mutex_unlock(&smack_cipso_lock);
863 * smk_write_cipso - write() for /smack/cipso
864 * @file: file pointer, not actually used
865 * @buf: where to get the data from
867 * @ppos: where to start
869 * Accepts only one cipso rule per write call.
870 * Returns number of bytes written or error code, as appropriate
872 static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
873 size_t count, loff_t *ppos)
875 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
878 static const struct file_operations smk_cipso_ops = {
879 .open = smk_open_cipso,
882 .write = smk_write_cipso,
883 .release = seq_release,
887 * Seq_file read operations for /smack/cipso2
891 * Print cipso labels in format:
892 * label level[/cat[,cat]]
894 static int cipso2_seq_show(struct seq_file *s, void *v)
896 struct list_head *list = v;
897 struct smack_known *skp =
898 list_entry(list, struct smack_known, list);
899 struct netlbl_lsm_secattr_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
903 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
905 for (i = netlbl_secattr_catmap_walk(cmp, 0); i >= 0;
906 i = netlbl_secattr_catmap_walk(cmp, i + 1)) {
907 seq_printf(s, "%c%d", sep, i);
916 static const struct seq_operations cipso2_seq_ops = {
917 .start = cipso_seq_start,
918 .next = cipso_seq_next,
919 .show = cipso2_seq_show,
920 .stop = smk_seq_stop,
924 * smk_open_cipso2 - open() for /smack/cipso2
925 * @inode: inode structure representing file
926 * @file: "cipso2" file pointer
928 * Connect our cipso_seq_* operations with /smack/cipso2
931 static int smk_open_cipso2(struct inode *inode, struct file *file)
933 return seq_open(file, &cipso2_seq_ops);
937 * smk_write_cipso2 - write() for /smack/cipso2
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_cipso2(struct file *file, const char __user *buf,
947 size_t count, loff_t *ppos)
949 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
952 static const struct file_operations smk_cipso2_ops = {
953 .open = smk_open_cipso2,
956 .write = smk_write_cipso2,
957 .release = seq_release,
961 * Seq_file read operations for /smack/netlabel
964 static void *netlbladdr_seq_start(struct seq_file *s, loff_t *pos)
966 return smk_seq_start(s, pos, &smk_netlbladdr_list);
969 static void *netlbladdr_seq_next(struct seq_file *s, void *v, loff_t *pos)
971 return smk_seq_next(s, v, pos, &smk_netlbladdr_list);
973 #define BEBITS (sizeof(__be32) * 8)
976 * Print host/label pairs
978 static int netlbladdr_seq_show(struct seq_file *s, void *v)
980 struct list_head *list = v;
981 struct smk_netlbladdr *skp =
982 list_entry(list, struct smk_netlbladdr, list);
983 unsigned char *hp = (char *) &skp->smk_host.sin_addr.s_addr;
985 u32 temp_mask = be32_to_cpu(skp->smk_mask.s_addr);
987 for (maskn = 0; temp_mask; temp_mask <<= 1, maskn++);
989 seq_printf(s, "%u.%u.%u.%u/%d %s\n",
990 hp[0], hp[1], hp[2], hp[3], maskn, skp->smk_label);
995 static const struct seq_operations netlbladdr_seq_ops = {
996 .start = netlbladdr_seq_start,
997 .next = netlbladdr_seq_next,
998 .show = netlbladdr_seq_show,
999 .stop = smk_seq_stop,
1003 * smk_open_netlbladdr - open() for /smack/netlabel
1004 * @inode: inode structure representing file
1005 * @file: "netlabel" file pointer
1007 * Connect our netlbladdr_seq_* operations with /smack/netlabel
1010 static int smk_open_netlbladdr(struct inode *inode, struct file *file)
1012 return seq_open(file, &netlbladdr_seq_ops);
1016 * smk_netlbladdr_insert
1017 * @new : netlabel to insert
1019 * This helper insert netlabel in the smack_netlbladdrs list
1020 * sorted by netmask length (longest to smallest)
1021 * locked by &smk_netlbladdr_lock in smk_write_netlbladdr
1024 static void smk_netlbladdr_insert(struct smk_netlbladdr *new)
1026 struct smk_netlbladdr *m, *m_next;
1028 if (list_empty(&smk_netlbladdr_list)) {
1029 list_add_rcu(&new->list, &smk_netlbladdr_list);
1033 m = list_entry_rcu(smk_netlbladdr_list.next,
1034 struct smk_netlbladdr, list);
1036 /* the comparison '>' is a bit hacky, but works */
1037 if (new->smk_mask.s_addr > m->smk_mask.s_addr) {
1038 list_add_rcu(&new->list, &smk_netlbladdr_list);
1042 list_for_each_entry_rcu(m, &smk_netlbladdr_list, list) {
1043 if (list_is_last(&m->list, &smk_netlbladdr_list)) {
1044 list_add_rcu(&new->list, &m->list);
1047 m_next = list_entry_rcu(m->list.next,
1048 struct smk_netlbladdr, list);
1049 if (new->smk_mask.s_addr > m_next->smk_mask.s_addr) {
1050 list_add_rcu(&new->list, &m->list);
1058 * smk_write_netlbladdr - write() for /smack/netlabel
1059 * @file: file pointer, not actually used
1060 * @buf: where to get the data from
1061 * @count: bytes sent
1062 * @ppos: where to start
1064 * Accepts only one netlbladdr per write call.
1065 * Returns number of bytes written or error code, as appropriate
1067 static ssize_t smk_write_netlbladdr(struct file *file, const char __user *buf,
1068 size_t count, loff_t *ppos)
1070 struct smk_netlbladdr *skp;
1071 struct sockaddr_in newname;
1075 char *host = (char *)&newname.sin_addr.s_addr;
1077 struct netlbl_audit audit_info;
1078 struct in_addr mask;
1081 u32 mask_bits = (1<<31);
1086 * Must have privilege.
1087 * No partial writes.
1088 * Enough data must be present.
1089 * "<addr/mask, as a.b.c.d/e><space><label>"
1090 * "<addr, as a.b.c.d><space><label>"
1092 if (!smack_privileged(CAP_MAC_ADMIN))
1096 if (count < SMK_NETLBLADDRMIN)
1099 data = kzalloc(count + 1, GFP_KERNEL);
1103 if (copy_from_user(data, buf, count) != 0) {
1108 smack = kzalloc(count + 1, GFP_KERNEL);
1109 if (smack == NULL) {
1116 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%d %s",
1117 &host[0], &host[1], &host[2], &host[3], &m, smack);
1119 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1120 &host[0], &host[1], &host[2], &host[3], smack);
1133 * If smack begins with '-', it is an option, don't import it
1135 if (smack[0] != '-') {
1136 sp = smk_import(smack, 0);
1142 /* check known options */
1143 if (strcmp(smack, smack_cipso_option) == 0)
1144 sp = (char *)smack_cipso_option;
1151 for (temp_mask = 0; m > 0; m--) {
1152 temp_mask |= mask_bits;
1155 mask.s_addr = cpu_to_be32(temp_mask);
1157 newname.sin_addr.s_addr &= mask.s_addr;
1159 * Only allow one writer at a time. Writes should be
1160 * quite rare and small in any case.
1162 mutex_lock(&smk_netlbladdr_lock);
1164 nsa = newname.sin_addr.s_addr;
1165 /* try to find if the prefix is already in the list */
1167 list_for_each_entry_rcu(skp, &smk_netlbladdr_list, list) {
1168 if (skp->smk_host.sin_addr.s_addr == nsa &&
1169 skp->smk_mask.s_addr == mask.s_addr) {
1174 smk_netlabel_audit_set(&audit_info);
1177 skp = kzalloc(sizeof(*skp), GFP_KERNEL);
1182 skp->smk_host.sin_addr.s_addr = newname.sin_addr.s_addr;
1183 skp->smk_mask.s_addr = mask.s_addr;
1184 skp->smk_label = sp;
1185 smk_netlbladdr_insert(skp);
1188 /* we delete the unlabeled entry, only if the previous label
1189 * wasn't the special CIPSO option */
1190 if (skp->smk_label != smack_cipso_option)
1191 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1192 &skp->smk_host.sin_addr, &skp->smk_mask,
1193 PF_INET, &audit_info);
1196 skp->smk_label = sp;
1200 * Now tell netlabel about the single label nature of
1201 * this host so that incoming packets get labeled.
1202 * but only if we didn't get the special CIPSO option
1204 if (rc == 0 && sp != smack_cipso_option)
1205 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1206 &skp->smk_host.sin_addr, &skp->smk_mask, PF_INET,
1207 smack_to_secid(skp->smk_label), &audit_info);
1212 mutex_unlock(&smk_netlbladdr_lock);
1222 static const struct file_operations smk_netlbladdr_ops = {
1223 .open = smk_open_netlbladdr,
1225 .llseek = seq_lseek,
1226 .write = smk_write_netlbladdr,
1227 .release = seq_release,
1231 * smk_read_doi - read() for /smack/doi
1232 * @filp: file pointer, not actually used
1233 * @buf: where to put the result
1234 * @count: maximum to send along
1235 * @ppos: where to start
1237 * Returns number of bytes read or error code, as appropriate
1239 static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1240 size_t count, loff_t *ppos)
1248 sprintf(temp, "%d", smk_cipso_doi_value);
1249 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1255 * smk_write_doi - write() for /smack/doi
1256 * @file: file pointer, not actually used
1257 * @buf: where to get the data from
1258 * @count: bytes sent
1259 * @ppos: where to start
1261 * Returns number of bytes written or error code, as appropriate
1263 static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1264 size_t count, loff_t *ppos)
1269 if (!smack_privileged(CAP_MAC_ADMIN))
1272 if (count >= sizeof(temp) || count == 0)
1275 if (copy_from_user(temp, buf, count) != 0)
1280 if (sscanf(temp, "%d", &i) != 1)
1283 smk_cipso_doi_value = i;
1290 static const struct file_operations smk_doi_ops = {
1291 .read = smk_read_doi,
1292 .write = smk_write_doi,
1293 .llseek = default_llseek,
1297 * smk_read_direct - read() for /smack/direct
1298 * @filp: file pointer, not actually used
1299 * @buf: where to put the result
1300 * @count: maximum to send along
1301 * @ppos: where to start
1303 * Returns number of bytes read or error code, as appropriate
1305 static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1306 size_t count, loff_t *ppos)
1314 sprintf(temp, "%d", smack_cipso_direct);
1315 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1321 * smk_write_direct - write() for /smack/direct
1322 * @file: file pointer, not actually used
1323 * @buf: where to get the data from
1324 * @count: bytes sent
1325 * @ppos: where to start
1327 * Returns number of bytes written or error code, as appropriate
1329 static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1330 size_t count, loff_t *ppos)
1332 struct smack_known *skp;
1336 if (!smack_privileged(CAP_MAC_ADMIN))
1339 if (count >= sizeof(temp) || count == 0)
1342 if (copy_from_user(temp, buf, count) != 0)
1347 if (sscanf(temp, "%d", &i) != 1)
1351 * Don't do anything if the value hasn't actually changed.
1352 * If it is changing reset the level on entries that were
1353 * set up to be direct when they were created.
1355 if (smack_cipso_direct != i) {
1356 mutex_lock(&smack_known_lock);
1357 list_for_each_entry_rcu(skp, &smack_known_list, list)
1358 if (skp->smk_netlabel.attr.mls.lvl ==
1360 skp->smk_netlabel.attr.mls.lvl = i;
1361 smack_cipso_direct = i;
1362 mutex_unlock(&smack_known_lock);
1368 static const struct file_operations smk_direct_ops = {
1369 .read = smk_read_direct,
1370 .write = smk_write_direct,
1371 .llseek = default_llseek,
1375 * smk_read_mapped - read() for /smack/mapped
1376 * @filp: file pointer, not actually used
1377 * @buf: where to put the result
1378 * @count: maximum to send along
1379 * @ppos: where to start
1381 * Returns number of bytes read or error code, as appropriate
1383 static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1384 size_t count, loff_t *ppos)
1392 sprintf(temp, "%d", smack_cipso_mapped);
1393 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1399 * smk_write_mapped - write() for /smack/mapped
1400 * @file: file pointer, not actually used
1401 * @buf: where to get the data from
1402 * @count: bytes sent
1403 * @ppos: where to start
1405 * Returns number of bytes written or error code, as appropriate
1407 static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1408 size_t count, loff_t *ppos)
1410 struct smack_known *skp;
1414 if (!smack_privileged(CAP_MAC_ADMIN))
1417 if (count >= sizeof(temp) || count == 0)
1420 if (copy_from_user(temp, buf, count) != 0)
1425 if (sscanf(temp, "%d", &i) != 1)
1429 * Don't do anything if the value hasn't actually changed.
1430 * If it is changing reset the level on entries that were
1431 * set up to be mapped when they were created.
1433 if (smack_cipso_mapped != i) {
1434 mutex_lock(&smack_known_lock);
1435 list_for_each_entry_rcu(skp, &smack_known_list, list)
1436 if (skp->smk_netlabel.attr.mls.lvl ==
1438 skp->smk_netlabel.attr.mls.lvl = i;
1439 smack_cipso_mapped = i;
1440 mutex_unlock(&smack_known_lock);
1446 static const struct file_operations smk_mapped_ops = {
1447 .read = smk_read_mapped,
1448 .write = smk_write_mapped,
1449 .llseek = default_llseek,
1453 * smk_read_ambient - read() for /smack/ambient
1454 * @filp: file pointer, not actually used
1455 * @buf: where to put the result
1456 * @cn: maximum to send along
1457 * @ppos: where to start
1459 * Returns number of bytes read or error code, as appropriate
1461 static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1462 size_t cn, loff_t *ppos)
1470 * Being careful to avoid a problem in the case where
1471 * smack_net_ambient gets changed in midstream.
1473 mutex_lock(&smack_ambient_lock);
1475 asize = strlen(smack_net_ambient) + 1;
1478 rc = simple_read_from_buffer(buf, cn, ppos,
1479 smack_net_ambient, asize);
1483 mutex_unlock(&smack_ambient_lock);
1489 * smk_write_ambient - write() for /smack/ambient
1490 * @file: file pointer, not actually used
1491 * @buf: where to get the data from
1492 * @count: bytes sent
1493 * @ppos: where to start
1495 * Returns number of bytes written or error code, as appropriate
1497 static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1498 size_t count, loff_t *ppos)
1505 if (!smack_privileged(CAP_MAC_ADMIN))
1508 data = kzalloc(count + 1, GFP_KERNEL);
1512 if (copy_from_user(data, buf, count) != 0) {
1517 smack = smk_import(data, count);
1518 if (smack == NULL) {
1523 mutex_lock(&smack_ambient_lock);
1525 oldambient = smack_net_ambient;
1526 smack_net_ambient = smack;
1527 smk_unlbl_ambient(oldambient);
1529 mutex_unlock(&smack_ambient_lock);
1536 static const struct file_operations smk_ambient_ops = {
1537 .read = smk_read_ambient,
1538 .write = smk_write_ambient,
1539 .llseek = default_llseek,
1543 * smk_read_onlycap - read() for /smack/onlycap
1544 * @filp: file pointer, not actually used
1545 * @buf: where to put the result
1546 * @cn: maximum to send along
1547 * @ppos: where to start
1549 * Returns number of bytes read or error code, as appropriate
1551 static ssize_t smk_read_onlycap(struct file *filp, char __user *buf,
1552 size_t cn, loff_t *ppos)
1555 ssize_t rc = -EINVAL;
1561 if (smack_onlycap != NULL)
1562 smack = smack_onlycap;
1564 asize = strlen(smack) + 1;
1567 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
1573 * smk_write_onlycap - write() for /smack/onlycap
1574 * @file: file pointer, not actually used
1575 * @buf: where to get the data from
1576 * @count: bytes sent
1577 * @ppos: where to start
1579 * Returns number of bytes written or error code, as appropriate
1581 static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
1582 size_t count, loff_t *ppos)
1585 char *sp = smk_of_task(current->cred->security);
1588 if (!smack_privileged(CAP_MAC_ADMIN))
1592 * This can be done using smk_access() but is done
1593 * explicitly for clarity. The smk_access() implementation
1594 * would use smk_access(smack_onlycap, MAY_WRITE)
1596 if (smack_onlycap != NULL && smack_onlycap != sp)
1599 data = kzalloc(count, GFP_KERNEL);
1604 * Should the null string be passed in unset the onlycap value.
1605 * This seems like something to be careful with as usually
1606 * smk_import only expects to return NULL for errors. It
1607 * is usually the case that a nullstring or "\n" would be
1608 * bad to pass to smk_import but in fact this is useful here.
1610 * smk_import will also reject a label beginning with '-',
1611 * so "-usecapabilities" will also work.
1613 if (copy_from_user(data, buf, count) != 0)
1616 smack_onlycap = smk_import(data, count);
1622 static const struct file_operations smk_onlycap_ops = {
1623 .read = smk_read_onlycap,
1624 .write = smk_write_onlycap,
1625 .llseek = default_llseek,
1629 * smk_read_logging - read() for /smack/logging
1630 * @filp: file pointer, not actually used
1631 * @buf: where to put the result
1632 * @cn: maximum to send along
1633 * @ppos: where to start
1635 * Returns number of bytes read or error code, as appropriate
1637 static ssize_t smk_read_logging(struct file *filp, char __user *buf,
1638 size_t count, loff_t *ppos)
1646 sprintf(temp, "%d\n", log_policy);
1647 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1652 * smk_write_logging - write() for /smack/logging
1653 * @file: file pointer, not actually used
1654 * @buf: where to get the data from
1655 * @count: bytes sent
1656 * @ppos: where to start
1658 * Returns number of bytes written or error code, as appropriate
1660 static ssize_t smk_write_logging(struct file *file, const char __user *buf,
1661 size_t count, loff_t *ppos)
1666 if (!smack_privileged(CAP_MAC_ADMIN))
1669 if (count >= sizeof(temp) || count == 0)
1672 if (copy_from_user(temp, buf, count) != 0)
1677 if (sscanf(temp, "%d", &i) != 1)
1687 static const struct file_operations smk_logging_ops = {
1688 .read = smk_read_logging,
1689 .write = smk_write_logging,
1690 .llseek = default_llseek,
1694 * Seq_file read operations for /smack/load-self
1697 static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
1699 struct task_smack *tsp = current_security();
1701 return smk_seq_start(s, pos, &tsp->smk_rules);
1704 static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
1706 struct task_smack *tsp = current_security();
1708 return smk_seq_next(s, v, pos, &tsp->smk_rules);
1711 static int load_self_seq_show(struct seq_file *s, void *v)
1713 struct list_head *list = v;
1714 struct smack_rule *srp =
1715 list_entry(list, struct smack_rule, list);
1717 smk_rule_show(s, srp, SMK_LABELLEN);
1722 static const struct seq_operations load_self_seq_ops = {
1723 .start = load_self_seq_start,
1724 .next = load_self_seq_next,
1725 .show = load_self_seq_show,
1726 .stop = smk_seq_stop,
1731 * smk_open_load_self - open() for /smack/load-self2
1732 * @inode: inode structure representing file
1733 * @file: "load" file pointer
1735 * For reading, use load_seq_* seq_file reading operations.
1737 static int smk_open_load_self(struct inode *inode, struct file *file)
1739 return seq_open(file, &load_self_seq_ops);
1743 * smk_write_load_self - write() for /smack/load-self
1744 * @file: file pointer, not actually used
1745 * @buf: where to get the data from
1746 * @count: bytes sent
1747 * @ppos: where to start - must be 0
1750 static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
1751 size_t count, loff_t *ppos)
1753 struct task_smack *tsp = current_security();
1755 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1756 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
1759 static const struct file_operations smk_load_self_ops = {
1760 .open = smk_open_load_self,
1762 .llseek = seq_lseek,
1763 .write = smk_write_load_self,
1764 .release = seq_release,
1768 * smk_user_access - handle access check transaction
1769 * @file: file pointer
1770 * @buf: data from user space
1771 * @count: bytes sent
1772 * @ppos: where to start - must be 0
1774 static ssize_t smk_user_access(struct file *file, const char __user *buf,
1775 size_t count, loff_t *ppos, int format)
1777 struct smack_rule rule;
1782 data = simple_transaction_get(file, buf, count);
1784 return PTR_ERR(data);
1786 if (format == SMK_FIXED24_FMT) {
1787 if (count < SMK_LOADLEN)
1789 res = smk_parse_rule(data, &rule, 0);
1792 * Copy the data to make sure the string is terminated.
1794 cod = kzalloc(count + 1, GFP_KERNEL);
1797 memcpy(cod, data, count);
1799 res = smk_parse_long_rule(cod, &rule, 0);
1806 res = smk_access(rule.smk_subject, rule.smk_object, rule.smk_access,
1808 data[0] = res == 0 ? '1' : '0';
1811 simple_transaction_set(file, 2);
1813 if (format == SMK_FIXED24_FMT)
1819 * smk_write_access - handle access check transaction
1820 * @file: file pointer
1821 * @buf: data from user space
1822 * @count: bytes sent
1823 * @ppos: where to start - must be 0
1825 static ssize_t smk_write_access(struct file *file, const char __user *buf,
1826 size_t count, loff_t *ppos)
1828 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
1831 static const struct file_operations smk_access_ops = {
1832 .write = smk_write_access,
1833 .read = simple_transaction_read,
1834 .release = simple_transaction_release,
1835 .llseek = generic_file_llseek,
1840 * Seq_file read operations for /smack/load2
1843 static int load2_seq_show(struct seq_file *s, void *v)
1845 struct list_head *list = v;
1846 struct smack_master_list *smlp =
1847 list_entry(list, struct smack_master_list, list);
1849 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
1854 static const struct seq_operations load2_seq_ops = {
1855 .start = load2_seq_start,
1856 .next = load2_seq_next,
1857 .show = load2_seq_show,
1858 .stop = smk_seq_stop,
1862 * smk_open_load2 - open() for /smack/load2
1863 * @inode: inode structure representing file
1864 * @file: "load2" file pointer
1866 * For reading, use load2_seq_* seq_file reading operations.
1868 static int smk_open_load2(struct inode *inode, struct file *file)
1870 return seq_open(file, &load2_seq_ops);
1874 * smk_write_load2 - write() for /smack/load2
1875 * @file: file pointer, not actually used
1876 * @buf: where to get the data from
1877 * @count: bytes sent
1878 * @ppos: where to start - must be 0
1881 static ssize_t smk_write_load2(struct file *file, const char __user *buf,
1882 size_t count, loff_t *ppos)
1885 * Must have privilege.
1887 if (!smack_privileged(CAP_MAC_ADMIN))
1890 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
1894 static const struct file_operations smk_load2_ops = {
1895 .open = smk_open_load2,
1897 .llseek = seq_lseek,
1898 .write = smk_write_load2,
1899 .release = seq_release,
1903 * Seq_file read operations for /smack/load-self2
1906 static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
1908 struct task_smack *tsp = current_security();
1910 return smk_seq_start(s, pos, &tsp->smk_rules);
1913 static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
1915 struct task_smack *tsp = current_security();
1917 return smk_seq_next(s, v, pos, &tsp->smk_rules);
1920 static int load_self2_seq_show(struct seq_file *s, void *v)
1922 struct list_head *list = v;
1923 struct smack_rule *srp =
1924 list_entry(list, struct smack_rule, list);
1926 smk_rule_show(s, srp, SMK_LONGLABEL);
1931 static const struct seq_operations load_self2_seq_ops = {
1932 .start = load_self2_seq_start,
1933 .next = load_self2_seq_next,
1934 .show = load_self2_seq_show,
1935 .stop = smk_seq_stop,
1939 * smk_open_load_self2 - open() for /smack/load-self2
1940 * @inode: inode structure representing file
1941 * @file: "load" file pointer
1943 * For reading, use load_seq_* seq_file reading operations.
1945 static int smk_open_load_self2(struct inode *inode, struct file *file)
1947 return seq_open(file, &load_self2_seq_ops);
1951 * smk_write_load_self2 - write() for /smack/load-self2
1952 * @file: file pointer, not actually used
1953 * @buf: where to get the data from
1954 * @count: bytes sent
1955 * @ppos: where to start - must be 0
1958 static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
1959 size_t count, loff_t *ppos)
1961 struct task_smack *tsp = current_security();
1963 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
1964 &tsp->smk_rules_lock, SMK_LONG_FMT);
1967 static const struct file_operations smk_load_self2_ops = {
1968 .open = smk_open_load_self2,
1970 .llseek = seq_lseek,
1971 .write = smk_write_load_self2,
1972 .release = seq_release,
1976 * smk_write_access2 - handle access check transaction
1977 * @file: file pointer
1978 * @buf: data from user space
1979 * @count: bytes sent
1980 * @ppos: where to start - must be 0
1982 static ssize_t smk_write_access2(struct file *file, const char __user *buf,
1983 size_t count, loff_t *ppos)
1985 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
1988 static const struct file_operations smk_access2_ops = {
1989 .write = smk_write_access2,
1990 .read = simple_transaction_read,
1991 .release = simple_transaction_release,
1992 .llseek = generic_file_llseek,
1996 * smk_write_revoke_subj - write() for /smack/revoke-subject
1997 * @file: file pointer
1998 * @buf: data from user space
1999 * @count: bytes sent
2000 * @ppos: where to start - must be 0
2002 static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2003 size_t count, loff_t *ppos)
2006 const char *cp = NULL;
2007 struct smack_known *skp;
2008 struct smack_rule *sp;
2009 struct list_head *rule_list;
2010 struct mutex *rule_lock;
2016 if (!smack_privileged(CAP_MAC_ADMIN))
2019 if (count == 0 || count > SMK_LONGLABEL)
2022 data = kzalloc(count, GFP_KERNEL);
2026 if (copy_from_user(data, buf, count) != 0) {
2031 cp = smk_parse_smack(data, count);
2037 skp = smk_find_entry(cp);
2043 rule_list = &skp->smk_rules;
2044 rule_lock = &skp->smk_rules_lock;
2046 mutex_lock(rule_lock);
2048 list_for_each_entry_rcu(sp, rule_list, list)
2051 mutex_unlock(rule_lock);
2059 static const struct file_operations smk_revoke_subj_ops = {
2060 .write = smk_write_revoke_subj,
2061 .read = simple_transaction_read,
2062 .release = simple_transaction_release,
2063 .llseek = generic_file_llseek,
2066 static struct kset *smackfs_kset;
2068 * smk_init_sysfs - initialize /sys/fs/smackfs
2071 static int smk_init_sysfs(void)
2073 smackfs_kset = kset_create_and_add("smackfs", NULL, fs_kobj);
2080 * smk_fill_super - fill the /smackfs superblock
2081 * @sb: the empty superblock
2085 * Fill in the well known entries for /smack
2087 * Returns 0 on success, an error code on failure
2089 static int smk_fill_super(struct super_block *sb, void *data, int silent)
2092 struct inode *root_inode;
2094 static struct tree_descr smack_files[] = {
2096 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2098 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2100 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2102 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2104 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2105 [SMK_NETLBLADDR] = {
2106 "netlabel", &smk_netlbladdr_ops, S_IRUGO|S_IWUSR},
2108 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2110 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2112 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2114 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2116 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2118 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2119 [SMK_LOAD_SELF2] = {
2120 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2122 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2124 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2125 [SMK_REVOKE_SUBJ] = {
2126 "revoke-subject", &smk_revoke_subj_ops,
2132 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2134 printk(KERN_ERR "%s failed %d while creating inodes\n",
2139 root_inode = sb->s_root->d_inode;
2145 * smk_mount - get the smackfs superblock
2146 * @fs_type: passed along without comment
2147 * @flags: passed along without comment
2148 * @dev_name: passed along without comment
2149 * @data: passed along without comment
2151 * Just passes everything along.
2153 * Returns what the lower level code does.
2155 static struct dentry *smk_mount(struct file_system_type *fs_type,
2156 int flags, const char *dev_name, void *data)
2158 return mount_single(fs_type, flags, data, smk_fill_super);
2161 static struct file_system_type smk_fs_type = {
2164 .kill_sb = kill_litter_super,
2167 static struct vfsmount *smackfs_mount;
2169 static int __init smk_preset_netlabel(struct smack_known *skp)
2171 skp->smk_netlabel.domain = skp->smk_known;
2172 skp->smk_netlabel.flags =
2173 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2174 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2175 &skp->smk_netlabel, strlen(skp->smk_known));
2179 * init_smk_fs - get the smackfs superblock
2181 * register the smackfs
2183 * Do not register smackfs if Smack wasn't enabled
2184 * on boot. We can not put this method normally under the
2185 * smack_init() code path since the security subsystem get
2186 * initialized before the vfs caches.
2188 * Returns true if we were not chosen on boot or if
2189 * we were chosen and filesystem registration succeeded.
2191 static int __init init_smk_fs(void)
2196 if (!security_module_enable(&smack_ops))
2199 err = smk_init_sysfs();
2201 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2203 err = register_filesystem(&smk_fs_type);
2205 smackfs_mount = kern_mount(&smk_fs_type);
2206 if (IS_ERR(smackfs_mount)) {
2207 printk(KERN_ERR "smackfs: could not mount!\n");
2208 err = PTR_ERR(smackfs_mount);
2209 smackfs_mount = NULL;
2214 smk_unlbl_ambient(NULL);
2216 rc = smk_preset_netlabel(&smack_known_floor);
2217 if (err == 0 && rc < 0)
2219 rc = smk_preset_netlabel(&smack_known_hat);
2220 if (err == 0 && rc < 0)
2222 rc = smk_preset_netlabel(&smack_known_huh);
2223 if (err == 0 && rc < 0)
2225 rc = smk_preset_netlabel(&smack_known_invalid);
2226 if (err == 0 && rc < 0)
2228 rc = smk_preset_netlabel(&smack_known_star);
2229 if (err == 0 && rc < 0)
2231 rc = smk_preset_netlabel(&smack_known_web);
2232 if (err == 0 && rc < 0)
2238 __initcall(init_smk_fs);