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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 *
5 * Authors:
6 * Casey Schaufler <casey@schaufler-ca.com>
7 * Ahmed S. Darwish <darwish.07@gmail.com>
8 *
9 * Special thanks to the authors of selinuxfs.
10 *
11 * Karl MacMillan <kmacmillan@tresys.com>
12 * James Morris <jmorris@redhat.com>
13 */
14
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/mount.h>
27#include <linux/fs_context.h>
28#include "smack.h"
29
30#define BEBITS (sizeof(__be32) * 8)
31/*
32 * smackfs pseudo filesystem.
33 */
34
35enum smk_inos {
36 SMK_ROOT_INO = 2,
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_NET4ADDR = 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 '-' */
53 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
54 SMK_SYSLOG = 20, /* change syslog label) */
55 SMK_PTRACE = 21, /* set ptrace rule */
56#ifdef CONFIG_SECURITY_SMACK_BRINGUP
57 SMK_UNCONFINED = 22, /* define an unconfined label */
58#endif
59#if IS_ENABLED(CONFIG_IPV6)
60 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
61#endif /* CONFIG_IPV6 */
62 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
63};
64
65/*
66 * List locks
67 */
68static DEFINE_MUTEX(smack_cipso_lock);
69static DEFINE_MUTEX(smack_ambient_lock);
70static DEFINE_MUTEX(smk_net4addr_lock);
71#if IS_ENABLED(CONFIG_IPV6)
72static DEFINE_MUTEX(smk_net6addr_lock);
73#endif /* CONFIG_IPV6 */
74
75/*
76 * This is the "ambient" label for network traffic.
77 * If it isn't somehow marked, use this.
78 * It can be reset via smackfs/ambient
79 */
80struct smack_known *smack_net_ambient;
81
82/*
83 * This is the level in a CIPSO header that indicates a
84 * smack label is contained directly in the category set.
85 * It can be reset via smackfs/direct
86 */
87int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
88
89/*
90 * This is the level in a CIPSO header that indicates a
91 * secid is contained directly in the category set.
92 * It can be reset via smackfs/mapped
93 */
94int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
95
96#ifdef CONFIG_SECURITY_SMACK_BRINGUP
97/*
98 * Allow one label to be unconfined. This is for
99 * debugging and application bring-up purposes only.
100 * It is bad and wrong, but everyone seems to expect
101 * to have it.
102 */
103struct smack_known *smack_unconfined;
104#endif
105
106/*
107 * If this value is set restrict syslog use to the label specified.
108 * It can be reset via smackfs/syslog
109 */
110struct smack_known *smack_syslog_label;
111
112/*
113 * Ptrace current rule
114 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
115 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
116 * CAP_SYS_PTRACE
117 * SMACK_PTRACE_DRACONIAN labels must match, CAP_SYS_PTRACE has no effect
118 */
119int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
120
121/*
122 * Certain IP addresses may be designated as single label hosts.
123 * Packets are sent there unlabeled, but only from tasks that
124 * can write to the specified label.
125 */
126
127LIST_HEAD(smk_net4addr_list);
128#if IS_ENABLED(CONFIG_IPV6)
129LIST_HEAD(smk_net6addr_list);
130#endif /* CONFIG_IPV6 */
131
132/*
133 * Rule lists are maintained for each label.
134 */
135struct smack_parsed_rule {
136 struct smack_known *smk_subject;
137 struct smack_known *smk_object;
138 int smk_access1;
139 int smk_access2;
140};
141
142static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
143
144/*
145 * Values for parsing cipso rules
146 * SMK_DIGITLEN: Length of a digit field in a rule.
147 * SMK_CIPSOMIN: Minimum possible cipso rule length.
148 * SMK_CIPSOMAX: Maximum possible cipso rule length.
149 */
150#define SMK_DIGITLEN 4
151#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
152#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
153
154/*
155 * Values for parsing MAC rules
156 * SMK_ACCESS: Maximum possible combination of access permissions
157 * SMK_ACCESSLEN: Maximum length for a rule access field
158 * SMK_LOADLEN: Smack rule length
159 */
160#define SMK_OACCESS "rwxa"
161#define SMK_ACCESS "rwxatl"
162#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
163#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
164#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
165#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
166
167/*
168 * Stricly for CIPSO level manipulation.
169 * Set the category bit number in a smack label sized buffer.
170 */
171static inline void smack_catset_bit(unsigned int cat, char *catsetp)
172{
173 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
174 return;
175
176 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
177}
178
179/**
180 * smk_netlabel_audit_set - fill a netlbl_audit struct
181 * @nap: structure to fill
182 */
183static void smk_netlabel_audit_set(struct netlbl_audit *nap)
184{
185 nap->loginuid = audit_get_loginuid(current);
186 nap->sessionid = audit_get_sessionid(current);
187 nap->prop.smack.skp = smk_of_current();
188}
189
190/*
191 * Value for parsing single label host rules
192 * "1.2.3.4 X"
193 */
194#define SMK_NETLBLADDRMIN 9
195
196/**
197 * smk_set_access - add a rule to the rule list or replace an old rule
198 * @srp: the rule to add or replace
199 * @rule_list: the list of rules
200 * @rule_lock: the rule list lock
201 *
202 * Looks through the current subject/object/access list for
203 * the subject/object pair and replaces the access that was
204 * there. If the pair isn't found add it with the specified
205 * access.
206 *
207 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
208 * during the allocation of the new pair to add.
209 */
210static int smk_set_access(struct smack_parsed_rule *srp,
211 struct list_head *rule_list,
212 struct mutex *rule_lock)
213{
214 struct smack_rule *sp;
215 int found = 0;
216 int rc = 0;
217
218 mutex_lock(rule_lock);
219
220 /*
221 * Because the object label is less likely to match
222 * than the subject label check it first
223 */
224 list_for_each_entry_rcu(sp, rule_list, list) {
225 if (sp->smk_object == srp->smk_object &&
226 sp->smk_subject == srp->smk_subject) {
227 found = 1;
228 sp->smk_access |= srp->smk_access1;
229 sp->smk_access &= ~srp->smk_access2;
230 break;
231 }
232 }
233
234 if (found == 0) {
235 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
236 if (sp == NULL) {
237 rc = -ENOMEM;
238 goto out;
239 }
240
241 sp->smk_subject = srp->smk_subject;
242 sp->smk_object = srp->smk_object;
243 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
244
245 list_add_rcu(&sp->list, rule_list);
246 }
247
248out:
249 mutex_unlock(rule_lock);
250 return rc;
251}
252
253/**
254 * smk_perm_from_str - parse smack accesses from a text string
255 * @string: a text string that contains a Smack accesses code
256 *
257 * Returns an integer with respective bits set for specified accesses.
258 */
259static int smk_perm_from_str(const char *string)
260{
261 int perm = 0;
262 const char *cp;
263
264 for (cp = string; ; cp++)
265 switch (*cp) {
266 case '-':
267 break;
268 case 'r':
269 case 'R':
270 perm |= MAY_READ;
271 break;
272 case 'w':
273 case 'W':
274 perm |= MAY_WRITE;
275 break;
276 case 'x':
277 case 'X':
278 perm |= MAY_EXEC;
279 break;
280 case 'a':
281 case 'A':
282 perm |= MAY_APPEND;
283 break;
284 case 't':
285 case 'T':
286 perm |= MAY_TRANSMUTE;
287 break;
288 case 'l':
289 case 'L':
290 perm |= MAY_LOCK;
291 break;
292 case 'b':
293 case 'B':
294 perm |= MAY_BRINGUP;
295 break;
296 default:
297 return perm;
298 }
299}
300
301/**
302 * smk_fill_rule - Fill Smack rule from strings
303 * @subject: subject label string
304 * @object: object label string
305 * @access1: access string
306 * @access2: string with permissions to be removed
307 * @rule: Smack rule
308 * @import: if non-zero, import labels
309 * @len: label length limit
310 *
311 * Returns 0 on success, appropriate error code on failure.
312 */
313static int smk_fill_rule(const char *subject, const char *object,
314 const char *access1, const char *access2,
315 struct smack_parsed_rule *rule, int import,
316 int len)
317{
318 const char *cp;
319 struct smack_known *skp;
320
321 if (import) {
322 rule->smk_subject = smk_import_entry(subject, len);
323 if (IS_ERR(rule->smk_subject))
324 return PTR_ERR(rule->smk_subject);
325
326 rule->smk_object = smk_import_entry(object, len);
327 if (IS_ERR(rule->smk_object))
328 return PTR_ERR(rule->smk_object);
329 } else {
330 cp = smk_parse_smack(subject, len);
331 if (IS_ERR(cp))
332 return PTR_ERR(cp);
333 skp = smk_find_entry(cp);
334 kfree(cp);
335 if (skp == NULL)
336 return -ENOENT;
337 rule->smk_subject = skp;
338
339 cp = smk_parse_smack(object, len);
340 if (IS_ERR(cp))
341 return PTR_ERR(cp);
342 skp = smk_find_entry(cp);
343 kfree(cp);
344 if (skp == NULL)
345 return -ENOENT;
346 rule->smk_object = skp;
347 }
348
349 rule->smk_access1 = smk_perm_from_str(access1);
350 if (access2)
351 rule->smk_access2 = smk_perm_from_str(access2);
352 else
353 rule->smk_access2 = ~rule->smk_access1;
354
355 return 0;
356}
357
358/**
359 * smk_parse_rule - parse Smack rule from load string
360 * @data: string to be parsed whose size is SMK_LOADLEN
361 * @rule: Smack rule
362 * @import: if non-zero, import labels
363 *
364 * Returns 0 on success, -1 on errors.
365 */
366static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
367 int import)
368{
369 int rc;
370
371 rc = smk_fill_rule(data, data + SMK_LABELLEN,
372 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
373 import, SMK_LABELLEN);
374 return rc;
375}
376
377/**
378 * smk_parse_long_rule - parse Smack rule from rule string
379 * @data: string to be parsed, null terminated
380 * @rule: Will be filled with Smack parsed rule
381 * @import: if non-zero, import labels
382 * @tokens: number of substrings expected in data
383 *
384 * Returns number of processed bytes on success, -ERRNO on failure.
385 */
386static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
387 int import, int tokens)
388{
389 ssize_t cnt = 0;
390 char *tok[4];
391 int rc;
392 int i;
393
394 /*
395 * Parsing the rule in-place, filling all white-spaces with '\0'
396 */
397 for (i = 0; i < tokens; ++i) {
398 while (isspace(data[cnt]))
399 data[cnt++] = '\0';
400
401 if (data[cnt] == '\0')
402 /* Unexpected end of data */
403 return -EINVAL;
404
405 tok[i] = data + cnt;
406
407 while (data[cnt] && !isspace(data[cnt]))
408 ++cnt;
409 }
410 while (isspace(data[cnt]))
411 data[cnt++] = '\0';
412
413 while (i < 4)
414 tok[i++] = NULL;
415
416 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
417 return rc == 0 ? cnt : rc;
418}
419
420#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
421#define SMK_LONG_FMT 1 /* Variable long label format */
422#define SMK_CHANGE_FMT 2 /* Rule modification format */
423/**
424 * smk_write_rules_list - write() for any /smack rule file
425 * @file: file pointer, not actually used
426 * @buf: where to get the data from
427 * @count: bytes sent
428 * @ppos: where to start - must be 0
429 * @rule_list: the list of rules to write to
430 * @rule_lock: lock for the rule list
431 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
432 *
433 * Get one smack access rule from above.
434 * The format for SMK_LONG_FMT is:
435 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
436 * The format for SMK_FIXED24_FMT is exactly:
437 * "subject object rwxat"
438 * The format for SMK_CHANGE_FMT is:
439 * "subject<whitespace>object<whitespace>
440 * acc_enable<whitespace>acc_disable[<whitespace>...]"
441 */
442static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
443 size_t count, loff_t *ppos,
444 struct list_head *rule_list,
445 struct mutex *rule_lock, int format)
446{
447 struct smack_parsed_rule rule;
448 char *data;
449 int rc;
450 int trunc = 0;
451 int tokens;
452 ssize_t cnt = 0;
453
454 /*
455 * No partial writes.
456 * Enough data must be present.
457 */
458 if (*ppos != 0)
459 return -EINVAL;
460
461 if (format == SMK_FIXED24_FMT) {
462 /*
463 * Minor hack for backward compatibility
464 */
465 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
466 return -EINVAL;
467 } else {
468 if (count >= PAGE_SIZE) {
469 count = PAGE_SIZE - 1;
470 trunc = 1;
471 }
472 }
473
474 data = memdup_user_nul(buf, count);
475 if (IS_ERR(data))
476 return PTR_ERR(data);
477
478 /*
479 * In case of parsing only part of user buf,
480 * avoid having partial rule at the data buffer
481 */
482 if (trunc) {
483 while (count > 0 && (data[count - 1] != '\n'))
484 --count;
485 if (count == 0) {
486 rc = -EINVAL;
487 goto out;
488 }
489 }
490
491 data[count] = '\0';
492 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
493 while (cnt < count) {
494 if (format == SMK_FIXED24_FMT) {
495 rc = smk_parse_rule(data, &rule, 1);
496 if (rc < 0)
497 goto out;
498 cnt = count;
499 } else {
500 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
501 if (rc < 0)
502 goto out;
503 if (rc == 0) {
504 rc = -EINVAL;
505 goto out;
506 }
507 cnt += rc;
508 }
509
510 if (rule_list == NULL)
511 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
512 &rule.smk_subject->smk_rules_lock);
513 else
514 rc = smk_set_access(&rule, rule_list, rule_lock);
515
516 if (rc)
517 goto out;
518 }
519
520 rc = cnt;
521out:
522 kfree(data);
523 return rc;
524}
525
526/*
527 * Core logic for smackfs seq list operations.
528 */
529
530static void *smk_seq_start(struct seq_file *s, loff_t *pos,
531 struct list_head *head)
532{
533 struct list_head *list;
534 int i = *pos;
535
536 rcu_read_lock();
537 for (list = rcu_dereference(list_next_rcu(head));
538 list != head;
539 list = rcu_dereference(list_next_rcu(list))) {
540 if (i-- == 0)
541 return list;
542 }
543
544 return NULL;
545}
546
547static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
548 struct list_head *head)
549{
550 struct list_head *list = v;
551
552 ++*pos;
553 list = rcu_dereference(list_next_rcu(list));
554
555 return (list == head) ? NULL : list;
556}
557
558static void smk_seq_stop(struct seq_file *s, void *v)
559{
560 rcu_read_unlock();
561}
562
563static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
564{
565 /*
566 * Don't show any rules with label names too long for
567 * interface file (/smack/load or /smack/load2)
568 * because you should expect to be able to write
569 * anything you read back.
570 */
571 if (strlen(srp->smk_subject->smk_known) >= max ||
572 strlen(srp->smk_object->smk_known) >= max)
573 return;
574
575 if (srp->smk_access == 0)
576 return;
577
578 seq_printf(s, "%s %s",
579 srp->smk_subject->smk_known,
580 srp->smk_object->smk_known);
581
582 seq_putc(s, ' ');
583
584 if (srp->smk_access & MAY_READ)
585 seq_putc(s, 'r');
586 if (srp->smk_access & MAY_WRITE)
587 seq_putc(s, 'w');
588 if (srp->smk_access & MAY_EXEC)
589 seq_putc(s, 'x');
590 if (srp->smk_access & MAY_APPEND)
591 seq_putc(s, 'a');
592 if (srp->smk_access & MAY_TRANSMUTE)
593 seq_putc(s, 't');
594 if (srp->smk_access & MAY_LOCK)
595 seq_putc(s, 'l');
596 if (srp->smk_access & MAY_BRINGUP)
597 seq_putc(s, 'b');
598
599 seq_putc(s, '\n');
600}
601
602/*
603 * Seq_file read operations for /smack/load
604 */
605
606static void *load2_seq_start(struct seq_file *s, loff_t *pos)
607{
608 return smk_seq_start(s, pos, &smack_known_list);
609}
610
611static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
612{
613 return smk_seq_next(s, v, pos, &smack_known_list);
614}
615
616static int load_seq_show(struct seq_file *s, void *v)
617{
618 struct list_head *list = v;
619 struct smack_rule *srp;
620 struct smack_known *skp =
621 list_entry_rcu(list, struct smack_known, list);
622
623 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
624 smk_rule_show(s, srp, SMK_LABELLEN);
625
626 return 0;
627}
628
629static const struct seq_operations load_seq_ops = {
630 .start = load2_seq_start,
631 .next = load2_seq_next,
632 .show = load_seq_show,
633 .stop = smk_seq_stop,
634};
635
636/**
637 * smk_open_load - open() for /smack/load
638 * @inode: inode structure representing file
639 * @file: "load" file pointer
640 *
641 * For reading, use load_seq_* seq_file reading operations.
642 */
643static int smk_open_load(struct inode *inode, struct file *file)
644{
645 return seq_open(file, &load_seq_ops);
646}
647
648/**
649 * smk_write_load - write() for /smack/load
650 * @file: file pointer, not actually used
651 * @buf: where to get the data from
652 * @count: bytes sent
653 * @ppos: where to start - must be 0
654 *
655 */
656static ssize_t smk_write_load(struct file *file, const char __user *buf,
657 size_t count, loff_t *ppos)
658{
659 /*
660 * Must have privilege.
661 * No partial writes.
662 * Enough data must be present.
663 */
664 if (!smack_privileged(CAP_MAC_ADMIN))
665 return -EPERM;
666
667 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
668 SMK_FIXED24_FMT);
669}
670
671static const struct file_operations smk_load_ops = {
672 .open = smk_open_load,
673 .read = seq_read,
674 .llseek = seq_lseek,
675 .write = smk_write_load,
676 .release = seq_release,
677};
678
679/**
680 * smk_cipso_doi - initialize the CIPSO domain
681 */
682static void smk_cipso_doi(void)
683{
684 int rc;
685 struct cipso_v4_doi *doip;
686 struct netlbl_audit nai;
687
688 smk_netlabel_audit_set(&nai);
689
690 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
691 if (rc != 0)
692 printk(KERN_WARNING "%s:%d remove rc = %d\n",
693 __func__, __LINE__, rc);
694
695 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
696 doip->map.std = NULL;
697 doip->doi = smk_cipso_doi_value;
698 doip->type = CIPSO_V4_MAP_PASS;
699 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
700 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
701 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
702
703 rc = netlbl_cfg_cipsov4_add(doip, &nai);
704 if (rc != 0) {
705 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
706 __func__, __LINE__, rc);
707 kfree(doip);
708 return;
709 }
710 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
711 if (rc != 0) {
712 printk(KERN_WARNING "%s:%d map add rc = %d\n",
713 __func__, __LINE__, rc);
714 netlbl_cfg_cipsov4_del(doip->doi, &nai);
715 return;
716 }
717}
718
719/**
720 * smk_unlbl_ambient - initialize the unlabeled domain
721 * @oldambient: previous domain string
722 */
723static void smk_unlbl_ambient(char *oldambient)
724{
725 int rc;
726 struct netlbl_audit nai;
727
728 smk_netlabel_audit_set(&nai);
729
730 if (oldambient != NULL) {
731 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
732 if (rc != 0)
733 printk(KERN_WARNING "%s:%d remove rc = %d\n",
734 __func__, __LINE__, rc);
735 }
736 if (smack_net_ambient == NULL)
737 smack_net_ambient = &smack_known_floor;
738
739 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
740 NULL, NULL, &nai);
741 if (rc != 0)
742 printk(KERN_WARNING "%s:%d add rc = %d\n",
743 __func__, __LINE__, rc);
744}
745
746/*
747 * Seq_file read operations for /smack/cipso
748 */
749
750static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
751{
752 return smk_seq_start(s, pos, &smack_known_list);
753}
754
755static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
756{
757 return smk_seq_next(s, v, pos, &smack_known_list);
758}
759
760/*
761 * Print cipso labels in format:
762 * label level[/cat[,cat]]
763 */
764static int cipso_seq_show(struct seq_file *s, void *v)
765{
766 struct list_head *list = v;
767 struct smack_known *skp =
768 list_entry_rcu(list, struct smack_known, list);
769 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
770 char sep = '/';
771 int i;
772
773 /*
774 * Don't show a label that could not have been set using
775 * /smack/cipso. This is in support of the notion that
776 * anything read from /smack/cipso ought to be writeable
777 * to /smack/cipso.
778 *
779 * /smack/cipso2 should be used instead.
780 */
781 if (strlen(skp->smk_known) >= SMK_LABELLEN)
782 return 0;
783
784 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
785
786 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
787 i = netlbl_catmap_walk(cmp, i + 1)) {
788 seq_printf(s, "%c%d", sep, i);
789 sep = ',';
790 }
791
792 seq_putc(s, '\n');
793
794 return 0;
795}
796
797static const struct seq_operations cipso_seq_ops = {
798 .start = cipso_seq_start,
799 .next = cipso_seq_next,
800 .show = cipso_seq_show,
801 .stop = smk_seq_stop,
802};
803
804/**
805 * smk_open_cipso - open() for /smack/cipso
806 * @inode: inode structure representing file
807 * @file: "cipso" file pointer
808 *
809 * Connect our cipso_seq_* operations with /smack/cipso
810 * file_operations
811 */
812static int smk_open_cipso(struct inode *inode, struct file *file)
813{
814 return seq_open(file, &cipso_seq_ops);
815}
816
817/**
818 * smk_set_cipso - do the work for write() for cipso and cipso2
819 * @file: file pointer, not actually used
820 * @buf: where to get the data from
821 * @count: bytes sent
822 * @ppos: where to start
823 * @format: /smack/cipso or /smack/cipso2
824 *
825 * Accepts only one cipso rule per write call.
826 * Returns number of bytes written or error code, as appropriate
827 */
828static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
829 size_t count, loff_t *ppos, int format)
830{
831 struct netlbl_lsm_catmap *old_cat, *new_cat = NULL;
832 struct smack_known *skp;
833 struct netlbl_lsm_secattr ncats;
834 char mapcatset[SMK_CIPSOLEN];
835 int maplevel;
836 unsigned int cat;
837 int catlen;
838 ssize_t rc = -EINVAL;
839 char *data = NULL;
840 char *rule;
841 int ret;
842 int i;
843
844 /*
845 * Must have privilege.
846 * No partial writes.
847 * Enough data must be present.
848 */
849 if (!smack_privileged(CAP_MAC_ADMIN))
850 return -EPERM;
851 if (*ppos != 0)
852 return -EINVAL;
853 if (format == SMK_FIXED24_FMT &&
854 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
855 return -EINVAL;
856 if (count > PAGE_SIZE)
857 return -EINVAL;
858
859 data = memdup_user_nul(buf, count);
860 if (IS_ERR(data))
861 return PTR_ERR(data);
862
863 rule = data;
864 /*
865 * Only allow one writer at a time. Writes should be
866 * quite rare and small in any case.
867 */
868 mutex_lock(&smack_cipso_lock);
869
870 skp = smk_import_entry(rule, 0);
871 if (IS_ERR(skp)) {
872 rc = PTR_ERR(skp);
873 goto out;
874 }
875
876 if (format == SMK_FIXED24_FMT)
877 rule += SMK_LABELLEN;
878 else
879 rule += strlen(skp->smk_known) + 1;
880
881 if (rule > data + count) {
882 rc = -EOVERFLOW;
883 goto out;
884 }
885
886 ret = sscanf(rule, "%d", &maplevel);
887 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
888 goto out;
889
890 rule += SMK_DIGITLEN;
891 if (rule > data + count) {
892 rc = -EOVERFLOW;
893 goto out;
894 }
895
896 ret = sscanf(rule, "%d", &catlen);
897 if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM)
898 goto out;
899
900 if (format == SMK_FIXED24_FMT &&
901 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
902 goto out;
903
904 memset(mapcatset, 0, sizeof(mapcatset));
905
906 for (i = 0; i < catlen; i++) {
907 rule += SMK_DIGITLEN;
908 if (rule > data + count) {
909 rc = -EOVERFLOW;
910 goto out;
911 }
912 ret = sscanf(rule, "%u", &cat);
913 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
914 goto out;
915
916 smack_catset_bit(cat, mapcatset);
917 }
918 ncats.flags = 0;
919 if (catlen == 0) {
920 ncats.attr.mls.cat = NULL;
921 ncats.attr.mls.lvl = maplevel;
922 new_cat = netlbl_catmap_alloc(GFP_ATOMIC);
923 if (new_cat)
924 new_cat->next = ncats.attr.mls.cat;
925 ncats.attr.mls.cat = new_cat;
926 skp->smk_netlabel.flags &= ~(1U << 3);
927 rc = 0;
928 } else {
929 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
930 }
931 if (rc >= 0) {
932 old_cat = skp->smk_netlabel.attr.mls.cat;
933 rcu_assign_pointer(skp->smk_netlabel.attr.mls.cat, ncats.attr.mls.cat);
934 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
935 synchronize_rcu();
936 netlbl_catmap_free(old_cat);
937 rc = count;
938 /*
939 * This mapping may have been cached, so clear the cache.
940 */
941 netlbl_cache_invalidate();
942 }
943
944out:
945 mutex_unlock(&smack_cipso_lock);
946 kfree(data);
947 return rc;
948}
949
950/**
951 * smk_write_cipso - write() for /smack/cipso
952 * @file: file pointer, not actually used
953 * @buf: where to get the data from
954 * @count: bytes sent
955 * @ppos: where to start
956 *
957 * Accepts only one cipso rule per write call.
958 * Returns number of bytes written or error code, as appropriate
959 */
960static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
961 size_t count, loff_t *ppos)
962{
963 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
964}
965
966static const struct file_operations smk_cipso_ops = {
967 .open = smk_open_cipso,
968 .read = seq_read,
969 .llseek = seq_lseek,
970 .write = smk_write_cipso,
971 .release = seq_release,
972};
973
974/*
975 * Seq_file read operations for /smack/cipso2
976 */
977
978/*
979 * Print cipso labels in format:
980 * label level[/cat[,cat]]
981 */
982static int cipso2_seq_show(struct seq_file *s, void *v)
983{
984 struct list_head *list = v;
985 struct smack_known *skp =
986 list_entry_rcu(list, struct smack_known, list);
987 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
988 char sep = '/';
989 int i;
990
991 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
992
993 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
994 i = netlbl_catmap_walk(cmp, i + 1)) {
995 seq_printf(s, "%c%d", sep, i);
996 sep = ',';
997 }
998
999 seq_putc(s, '\n');
1000
1001 return 0;
1002}
1003
1004static const struct seq_operations cipso2_seq_ops = {
1005 .start = cipso_seq_start,
1006 .next = cipso_seq_next,
1007 .show = cipso2_seq_show,
1008 .stop = smk_seq_stop,
1009};
1010
1011/**
1012 * smk_open_cipso2 - open() for /smack/cipso2
1013 * @inode: inode structure representing file
1014 * @file: "cipso2" file pointer
1015 *
1016 * Connect our cipso_seq_* operations with /smack/cipso2
1017 * file_operations
1018 */
1019static int smk_open_cipso2(struct inode *inode, struct file *file)
1020{
1021 return seq_open(file, &cipso2_seq_ops);
1022}
1023
1024/**
1025 * smk_write_cipso2 - write() for /smack/cipso2
1026 * @file: file pointer, not actually used
1027 * @buf: where to get the data from
1028 * @count: bytes sent
1029 * @ppos: where to start
1030 *
1031 * Accepts only one cipso rule per write call.
1032 * Returns number of bytes written or error code, as appropriate
1033 */
1034static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1035 size_t count, loff_t *ppos)
1036{
1037 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1038}
1039
1040static const struct file_operations smk_cipso2_ops = {
1041 .open = smk_open_cipso2,
1042 .read = seq_read,
1043 .llseek = seq_lseek,
1044 .write = smk_write_cipso2,
1045 .release = seq_release,
1046};
1047
1048/*
1049 * Seq_file read operations for /smack/netlabel
1050 */
1051
1052static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1053{
1054 return smk_seq_start(s, pos, &smk_net4addr_list);
1055}
1056
1057static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1058{
1059 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1060}
1061
1062/*
1063 * Print host/label pairs
1064 */
1065static int net4addr_seq_show(struct seq_file *s, void *v)
1066{
1067 struct list_head *list = v;
1068 struct smk_net4addr *skp =
1069 list_entry_rcu(list, struct smk_net4addr, list);
1070 char *kp = SMACK_CIPSO_OPTION;
1071
1072 if (skp->smk_label != NULL)
1073 kp = skp->smk_label->smk_known;
1074 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1075 skp->smk_masks, kp);
1076
1077 return 0;
1078}
1079
1080static const struct seq_operations net4addr_seq_ops = {
1081 .start = net4addr_seq_start,
1082 .next = net4addr_seq_next,
1083 .show = net4addr_seq_show,
1084 .stop = smk_seq_stop,
1085};
1086
1087/**
1088 * smk_open_net4addr - open() for /smack/netlabel
1089 * @inode: inode structure representing file
1090 * @file: "netlabel" file pointer
1091 *
1092 * Connect our net4addr_seq_* operations with /smack/netlabel
1093 * file_operations
1094 */
1095static int smk_open_net4addr(struct inode *inode, struct file *file)
1096{
1097 return seq_open(file, &net4addr_seq_ops);
1098}
1099
1100/**
1101 * smk_net4addr_insert
1102 * @new : netlabel to insert
1103 *
1104 * This helper insert netlabel in the smack_net4addrs list
1105 * sorted by netmask length (longest to smallest)
1106 * locked by &smk_net4addr_lock in smk_write_net4addr
1107 *
1108 */
1109static void smk_net4addr_insert(struct smk_net4addr *new)
1110{
1111 struct smk_net4addr *m;
1112 struct smk_net4addr *m_next;
1113
1114 if (list_empty(&smk_net4addr_list)) {
1115 list_add_rcu(&new->list, &smk_net4addr_list);
1116 return;
1117 }
1118
1119 m = list_entry_rcu(smk_net4addr_list.next,
1120 struct smk_net4addr, list);
1121
1122 /* the comparison '>' is a bit hacky, but works */
1123 if (new->smk_masks > m->smk_masks) {
1124 list_add_rcu(&new->list, &smk_net4addr_list);
1125 return;
1126 }
1127
1128 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1129 if (list_is_last(&m->list, &smk_net4addr_list)) {
1130 list_add_rcu(&new->list, &m->list);
1131 return;
1132 }
1133 m_next = list_entry_rcu(m->list.next,
1134 struct smk_net4addr, list);
1135 if (new->smk_masks > m_next->smk_masks) {
1136 list_add_rcu(&new->list, &m->list);
1137 return;
1138 }
1139 }
1140}
1141
1142
1143/**
1144 * smk_write_net4addr - write() for /smack/netlabel
1145 * @file: file pointer, not actually used
1146 * @buf: where to get the data from
1147 * @count: bytes sent
1148 * @ppos: where to start
1149 *
1150 * Accepts only one net4addr per write call.
1151 * Returns number of bytes written or error code, as appropriate
1152 */
1153static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1154 size_t count, loff_t *ppos)
1155{
1156 struct smk_net4addr *snp;
1157 struct sockaddr_in newname;
1158 char *smack;
1159 struct smack_known *skp = NULL;
1160 char *data;
1161 char *host = (char *)&newname.sin_addr.s_addr;
1162 int rc;
1163 struct netlbl_audit audit_info;
1164 struct in_addr mask;
1165 unsigned int m;
1166 unsigned int masks;
1167 int found;
1168 u32 mask_bits = (1<<31);
1169 __be32 nsa;
1170 u32 temp_mask;
1171
1172 /*
1173 * Must have privilege.
1174 * No partial writes.
1175 * Enough data must be present.
1176 * "<addr/mask, as a.b.c.d/e><space><label>"
1177 * "<addr, as a.b.c.d><space><label>"
1178 */
1179 if (!smack_privileged(CAP_MAC_ADMIN))
1180 return -EPERM;
1181 if (*ppos != 0)
1182 return -EINVAL;
1183 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1184 return -EINVAL;
1185
1186 data = memdup_user_nul(buf, count);
1187 if (IS_ERR(data))
1188 return PTR_ERR(data);
1189
1190 smack = kzalloc(count + 1, GFP_KERNEL);
1191 if (smack == NULL) {
1192 rc = -ENOMEM;
1193 goto free_data_out;
1194 }
1195
1196 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1197 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1198 if (rc != 6) {
1199 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1200 &host[0], &host[1], &host[2], &host[3], smack);
1201 if (rc != 5) {
1202 rc = -EINVAL;
1203 goto free_out;
1204 }
1205 masks = 32;
1206 }
1207 if (masks > BEBITS) {
1208 rc = -EINVAL;
1209 goto free_out;
1210 }
1211
1212 /*
1213 * If smack begins with '-', it is an option, don't import it
1214 */
1215 if (smack[0] != '-') {
1216 skp = smk_import_entry(smack, 0);
1217 if (IS_ERR(skp)) {
1218 rc = PTR_ERR(skp);
1219 goto free_out;
1220 }
1221 } else {
1222 /*
1223 * Only the -CIPSO option is supported for IPv4
1224 */
1225 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1226 rc = -EINVAL;
1227 goto free_out;
1228 }
1229 }
1230
1231 for (m = masks, temp_mask = 0; m > 0; m--) {
1232 temp_mask |= mask_bits;
1233 mask_bits >>= 1;
1234 }
1235 mask.s_addr = cpu_to_be32(temp_mask);
1236
1237 newname.sin_addr.s_addr &= mask.s_addr;
1238 /*
1239 * Only allow one writer at a time. Writes should be
1240 * quite rare and small in any case.
1241 */
1242 mutex_lock(&smk_net4addr_lock);
1243
1244 nsa = newname.sin_addr.s_addr;
1245 /* try to find if the prefix is already in the list */
1246 found = 0;
1247 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1248 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1249 found = 1;
1250 break;
1251 }
1252 }
1253 smk_netlabel_audit_set(&audit_info);
1254
1255 if (found == 0) {
1256 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1257 if (snp == NULL)
1258 rc = -ENOMEM;
1259 else {
1260 rc = 0;
1261 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1262 snp->smk_mask.s_addr = mask.s_addr;
1263 snp->smk_label = skp;
1264 snp->smk_masks = masks;
1265 smk_net4addr_insert(snp);
1266 }
1267 } else {
1268 /*
1269 * Delete the unlabeled entry, only if the previous label
1270 * wasn't the special CIPSO option
1271 */
1272 if (snp->smk_label != NULL)
1273 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1274 &snp->smk_host, &snp->smk_mask,
1275 PF_INET, &audit_info);
1276 else
1277 rc = 0;
1278 snp->smk_label = skp;
1279 }
1280
1281 /*
1282 * Now tell netlabel about the single label nature of
1283 * this host so that incoming packets get labeled.
1284 * but only if we didn't get the special CIPSO option
1285 */
1286 if (rc == 0 && skp != NULL)
1287 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1288 &snp->smk_host, &snp->smk_mask, PF_INET,
1289 snp->smk_label->smk_secid, &audit_info);
1290
1291 if (rc == 0)
1292 rc = count;
1293
1294 mutex_unlock(&smk_net4addr_lock);
1295
1296free_out:
1297 kfree(smack);
1298free_data_out:
1299 kfree(data);
1300
1301 return rc;
1302}
1303
1304static const struct file_operations smk_net4addr_ops = {
1305 .open = smk_open_net4addr,
1306 .read = seq_read,
1307 .llseek = seq_lseek,
1308 .write = smk_write_net4addr,
1309 .release = seq_release,
1310};
1311
1312#if IS_ENABLED(CONFIG_IPV6)
1313/*
1314 * Seq_file read operations for /smack/netlabel6
1315 */
1316
1317static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1318{
1319 return smk_seq_start(s, pos, &smk_net6addr_list);
1320}
1321
1322static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1323{
1324 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1325}
1326
1327/*
1328 * Print host/label pairs
1329 */
1330static int net6addr_seq_show(struct seq_file *s, void *v)
1331{
1332 struct list_head *list = v;
1333 struct smk_net6addr *skp =
1334 list_entry(list, struct smk_net6addr, list);
1335
1336 if (skp->smk_label != NULL)
1337 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1338 skp->smk_label->smk_known);
1339
1340 return 0;
1341}
1342
1343static const struct seq_operations net6addr_seq_ops = {
1344 .start = net6addr_seq_start,
1345 .next = net6addr_seq_next,
1346 .show = net6addr_seq_show,
1347 .stop = smk_seq_stop,
1348};
1349
1350/**
1351 * smk_open_net6addr - open() for /smack/netlabel
1352 * @inode: inode structure representing file
1353 * @file: "netlabel" file pointer
1354 *
1355 * Connect our net6addr_seq_* operations with /smack/netlabel
1356 * file_operations
1357 */
1358static int smk_open_net6addr(struct inode *inode, struct file *file)
1359{
1360 return seq_open(file, &net6addr_seq_ops);
1361}
1362
1363/**
1364 * smk_net6addr_insert
1365 * @new : entry to insert
1366 *
1367 * This inserts an entry in the smack_net6addrs list
1368 * sorted by netmask length (longest to smallest)
1369 * locked by &smk_net6addr_lock in smk_write_net6addr
1370 *
1371 */
1372static void smk_net6addr_insert(struct smk_net6addr *new)
1373{
1374 struct smk_net6addr *m_next;
1375 struct smk_net6addr *m;
1376
1377 if (list_empty(&smk_net6addr_list)) {
1378 list_add_rcu(&new->list, &smk_net6addr_list);
1379 return;
1380 }
1381
1382 m = list_entry_rcu(smk_net6addr_list.next,
1383 struct smk_net6addr, list);
1384
1385 if (new->smk_masks > m->smk_masks) {
1386 list_add_rcu(&new->list, &smk_net6addr_list);
1387 return;
1388 }
1389
1390 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1391 if (list_is_last(&m->list, &smk_net6addr_list)) {
1392 list_add_rcu(&new->list, &m->list);
1393 return;
1394 }
1395 m_next = list_entry_rcu(m->list.next,
1396 struct smk_net6addr, list);
1397 if (new->smk_masks > m_next->smk_masks) {
1398 list_add_rcu(&new->list, &m->list);
1399 return;
1400 }
1401 }
1402}
1403
1404
1405/**
1406 * smk_write_net6addr - write() for /smack/netlabel
1407 * @file: file pointer, not actually used
1408 * @buf: where to get the data from
1409 * @count: bytes sent
1410 * @ppos: where to start
1411 *
1412 * Accepts only one net6addr per write call.
1413 * Returns number of bytes written or error code, as appropriate
1414 */
1415static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1416 size_t count, loff_t *ppos)
1417{
1418 struct smk_net6addr *snp;
1419 struct in6_addr newname;
1420 struct in6_addr fullmask;
1421 struct smack_known *skp = NULL;
1422 char *smack;
1423 char *data;
1424 int rc = 0;
1425 int found = 0;
1426 int i;
1427 unsigned int scanned[8];
1428 unsigned int m;
1429 unsigned int mask = 128;
1430
1431 /*
1432 * Must have privilege.
1433 * No partial writes.
1434 * Enough data must be present.
1435 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1436 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1437 */
1438 if (!smack_privileged(CAP_MAC_ADMIN))
1439 return -EPERM;
1440 if (*ppos != 0)
1441 return -EINVAL;
1442 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1443 return -EINVAL;
1444
1445 data = memdup_user_nul(buf, count);
1446 if (IS_ERR(data))
1447 return PTR_ERR(data);
1448
1449 smack = kzalloc(count + 1, GFP_KERNEL);
1450 if (smack == NULL) {
1451 rc = -ENOMEM;
1452 goto free_data_out;
1453 }
1454
1455 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1456 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1457 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1458 &mask, smack);
1459 if (i != 10) {
1460 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1461 &scanned[0], &scanned[1], &scanned[2],
1462 &scanned[3], &scanned[4], &scanned[5],
1463 &scanned[6], &scanned[7], smack);
1464 if (i != 9) {
1465 rc = -EINVAL;
1466 goto free_out;
1467 }
1468 }
1469 if (mask > 128) {
1470 rc = -EINVAL;
1471 goto free_out;
1472 }
1473 for (i = 0; i < 8; i++) {
1474 if (scanned[i] > 0xffff) {
1475 rc = -EINVAL;
1476 goto free_out;
1477 }
1478 newname.s6_addr16[i] = htons(scanned[i]);
1479 }
1480
1481 /*
1482 * If smack begins with '-', it is an option, don't import it
1483 */
1484 if (smack[0] != '-') {
1485 skp = smk_import_entry(smack, 0);
1486 if (IS_ERR(skp)) {
1487 rc = PTR_ERR(skp);
1488 goto free_out;
1489 }
1490 } else {
1491 /*
1492 * Only -DELETE is supported for IPv6
1493 */
1494 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1495 rc = -EINVAL;
1496 goto free_out;
1497 }
1498 }
1499
1500 for (i = 0, m = mask; i < 8; i++) {
1501 if (m >= 16) {
1502 fullmask.s6_addr16[i] = 0xffff;
1503 m -= 16;
1504 } else if (m > 0) {
1505 fullmask.s6_addr16[i] = (1 << m) - 1;
1506 m = 0;
1507 } else
1508 fullmask.s6_addr16[i] = 0;
1509 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1510 }
1511
1512 /*
1513 * Only allow one writer at a time. Writes should be
1514 * quite rare and small in any case.
1515 */
1516 mutex_lock(&smk_net6addr_lock);
1517 /*
1518 * Try to find the prefix in the list
1519 */
1520 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1521 if (mask != snp->smk_masks)
1522 continue;
1523 for (found = 1, i = 0; i < 8; i++) {
1524 if (newname.s6_addr16[i] !=
1525 snp->smk_host.s6_addr16[i]) {
1526 found = 0;
1527 break;
1528 }
1529 }
1530 if (found == 1)
1531 break;
1532 }
1533 if (found == 0) {
1534 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1535 if (snp == NULL)
1536 rc = -ENOMEM;
1537 else {
1538 snp->smk_host = newname;
1539 snp->smk_mask = fullmask;
1540 snp->smk_masks = mask;
1541 snp->smk_label = skp;
1542 smk_net6addr_insert(snp);
1543 }
1544 } else {
1545 snp->smk_label = skp;
1546 }
1547
1548 if (rc == 0)
1549 rc = count;
1550
1551 mutex_unlock(&smk_net6addr_lock);
1552
1553free_out:
1554 kfree(smack);
1555free_data_out:
1556 kfree(data);
1557
1558 return rc;
1559}
1560
1561static const struct file_operations smk_net6addr_ops = {
1562 .open = smk_open_net6addr,
1563 .read = seq_read,
1564 .llseek = seq_lseek,
1565 .write = smk_write_net6addr,
1566 .release = seq_release,
1567};
1568#endif /* CONFIG_IPV6 */
1569
1570/**
1571 * smk_read_doi - read() for /smack/doi
1572 * @filp: file pointer, not actually used
1573 * @buf: where to put the result
1574 * @count: maximum to send along
1575 * @ppos: where to start
1576 *
1577 * Returns number of bytes read or error code, as appropriate
1578 */
1579static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1580 size_t count, loff_t *ppos)
1581{
1582 char temp[80];
1583 ssize_t rc;
1584
1585 if (*ppos != 0)
1586 return 0;
1587
1588 sprintf(temp, "%d", smk_cipso_doi_value);
1589 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1590
1591 return rc;
1592}
1593
1594/**
1595 * smk_write_doi - write() for /smack/doi
1596 * @file: file pointer, not actually used
1597 * @buf: where to get the data from
1598 * @count: bytes sent
1599 * @ppos: where to start
1600 *
1601 * Returns number of bytes written or error code, as appropriate
1602 */
1603static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1604 size_t count, loff_t *ppos)
1605{
1606 char temp[80];
1607 int i;
1608
1609 if (!smack_privileged(CAP_MAC_ADMIN))
1610 return -EPERM;
1611
1612 if (count >= sizeof(temp) || count == 0)
1613 return -EINVAL;
1614
1615 if (copy_from_user(temp, buf, count) != 0)
1616 return -EFAULT;
1617
1618 temp[count] = '\0';
1619
1620 if (sscanf(temp, "%d", &i) != 1)
1621 return -EINVAL;
1622
1623 smk_cipso_doi_value = i;
1624
1625 smk_cipso_doi();
1626
1627 return count;
1628}
1629
1630static const struct file_operations smk_doi_ops = {
1631 .read = smk_read_doi,
1632 .write = smk_write_doi,
1633 .llseek = default_llseek,
1634};
1635
1636/**
1637 * smk_read_direct - read() for /smack/direct
1638 * @filp: file pointer, not actually used
1639 * @buf: where to put the result
1640 * @count: maximum to send along
1641 * @ppos: where to start
1642 *
1643 * Returns number of bytes read or error code, as appropriate
1644 */
1645static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1646 size_t count, loff_t *ppos)
1647{
1648 char temp[80];
1649 ssize_t rc;
1650
1651 if (*ppos != 0)
1652 return 0;
1653
1654 sprintf(temp, "%d", smack_cipso_direct);
1655 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1656
1657 return rc;
1658}
1659
1660/**
1661 * smk_write_direct - write() for /smack/direct
1662 * @file: file pointer, not actually used
1663 * @buf: where to get the data from
1664 * @count: bytes sent
1665 * @ppos: where to start
1666 *
1667 * Returns number of bytes written or error code, as appropriate
1668 */
1669static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1670 size_t count, loff_t *ppos)
1671{
1672 struct smack_known *skp;
1673 char temp[80];
1674 int i;
1675
1676 if (!smack_privileged(CAP_MAC_ADMIN))
1677 return -EPERM;
1678
1679 if (count >= sizeof(temp) || count == 0)
1680 return -EINVAL;
1681
1682 if (copy_from_user(temp, buf, count) != 0)
1683 return -EFAULT;
1684
1685 temp[count] = '\0';
1686
1687 if (sscanf(temp, "%d", &i) != 1)
1688 return -EINVAL;
1689
1690 /*
1691 * Don't do anything if the value hasn't actually changed.
1692 * If it is changing reset the level on entries that were
1693 * set up to be direct when they were created.
1694 */
1695 if (smack_cipso_direct != i) {
1696 mutex_lock(&smack_known_lock);
1697 list_for_each_entry_rcu(skp, &smack_known_list, list)
1698 if (skp->smk_netlabel.attr.mls.lvl ==
1699 smack_cipso_direct)
1700 skp->smk_netlabel.attr.mls.lvl = i;
1701 smack_cipso_direct = i;
1702 mutex_unlock(&smack_known_lock);
1703 }
1704
1705 return count;
1706}
1707
1708static const struct file_operations smk_direct_ops = {
1709 .read = smk_read_direct,
1710 .write = smk_write_direct,
1711 .llseek = default_llseek,
1712};
1713
1714/**
1715 * smk_read_mapped - read() for /smack/mapped
1716 * @filp: file pointer, not actually used
1717 * @buf: where to put the result
1718 * @count: maximum to send along
1719 * @ppos: where to start
1720 *
1721 * Returns number of bytes read or error code, as appropriate
1722 */
1723static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1724 size_t count, loff_t *ppos)
1725{
1726 char temp[80];
1727 ssize_t rc;
1728
1729 if (*ppos != 0)
1730 return 0;
1731
1732 sprintf(temp, "%d", smack_cipso_mapped);
1733 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1734
1735 return rc;
1736}
1737
1738/**
1739 * smk_write_mapped - write() for /smack/mapped
1740 * @file: file pointer, not actually used
1741 * @buf: where to get the data from
1742 * @count: bytes sent
1743 * @ppos: where to start
1744 *
1745 * Returns number of bytes written or error code, as appropriate
1746 */
1747static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1748 size_t count, loff_t *ppos)
1749{
1750 struct smack_known *skp;
1751 char temp[80];
1752 int i;
1753
1754 if (!smack_privileged(CAP_MAC_ADMIN))
1755 return -EPERM;
1756
1757 if (count >= sizeof(temp) || count == 0)
1758 return -EINVAL;
1759
1760 if (copy_from_user(temp, buf, count) != 0)
1761 return -EFAULT;
1762
1763 temp[count] = '\0';
1764
1765 if (sscanf(temp, "%d", &i) != 1)
1766 return -EINVAL;
1767
1768 /*
1769 * Don't do anything if the value hasn't actually changed.
1770 * If it is changing reset the level on entries that were
1771 * set up to be mapped when they were created.
1772 */
1773 if (smack_cipso_mapped != i) {
1774 mutex_lock(&smack_known_lock);
1775 list_for_each_entry_rcu(skp, &smack_known_list, list)
1776 if (skp->smk_netlabel.attr.mls.lvl ==
1777 smack_cipso_mapped)
1778 skp->smk_netlabel.attr.mls.lvl = i;
1779 smack_cipso_mapped = i;
1780 mutex_unlock(&smack_known_lock);
1781 }
1782
1783 return count;
1784}
1785
1786static const struct file_operations smk_mapped_ops = {
1787 .read = smk_read_mapped,
1788 .write = smk_write_mapped,
1789 .llseek = default_llseek,
1790};
1791
1792/**
1793 * smk_read_ambient - read() for /smack/ambient
1794 * @filp: file pointer, not actually used
1795 * @buf: where to put the result
1796 * @cn: maximum to send along
1797 * @ppos: where to start
1798 *
1799 * Returns number of bytes read or error code, as appropriate
1800 */
1801static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1802 size_t cn, loff_t *ppos)
1803{
1804 ssize_t rc;
1805 int asize;
1806
1807 if (*ppos != 0)
1808 return 0;
1809 /*
1810 * Being careful to avoid a problem in the case where
1811 * smack_net_ambient gets changed in midstream.
1812 */
1813 mutex_lock(&smack_ambient_lock);
1814
1815 asize = strlen(smack_net_ambient->smk_known) + 1;
1816
1817 if (cn >= asize)
1818 rc = simple_read_from_buffer(buf, cn, ppos,
1819 smack_net_ambient->smk_known,
1820 asize);
1821 else
1822 rc = -EINVAL;
1823
1824 mutex_unlock(&smack_ambient_lock);
1825
1826 return rc;
1827}
1828
1829/**
1830 * smk_write_ambient - write() for /smack/ambient
1831 * @file: file pointer, not actually used
1832 * @buf: where to get the data from
1833 * @count: bytes sent
1834 * @ppos: where to start
1835 *
1836 * Returns number of bytes written or error code, as appropriate
1837 */
1838static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1839 size_t count, loff_t *ppos)
1840{
1841 struct smack_known *skp;
1842 char *oldambient;
1843 char *data;
1844 int rc = count;
1845
1846 if (!smack_privileged(CAP_MAC_ADMIN))
1847 return -EPERM;
1848
1849 /* Enough data must be present */
1850 if (count == 0 || count > PAGE_SIZE)
1851 return -EINVAL;
1852
1853 data = memdup_user_nul(buf, count);
1854 if (IS_ERR(data))
1855 return PTR_ERR(data);
1856
1857 skp = smk_import_entry(data, count);
1858 if (IS_ERR(skp)) {
1859 rc = PTR_ERR(skp);
1860 goto out;
1861 }
1862
1863 mutex_lock(&smack_ambient_lock);
1864
1865 oldambient = smack_net_ambient->smk_known;
1866 smack_net_ambient = skp;
1867 smk_unlbl_ambient(oldambient);
1868
1869 mutex_unlock(&smack_ambient_lock);
1870
1871out:
1872 kfree(data);
1873 return rc;
1874}
1875
1876static const struct file_operations smk_ambient_ops = {
1877 .read = smk_read_ambient,
1878 .write = smk_write_ambient,
1879 .llseek = default_llseek,
1880};
1881
1882/*
1883 * Seq_file operations for /smack/onlycap
1884 */
1885static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1886{
1887 return smk_seq_start(s, pos, &smack_onlycap_list);
1888}
1889
1890static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1891{
1892 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1893}
1894
1895static int onlycap_seq_show(struct seq_file *s, void *v)
1896{
1897 struct list_head *list = v;
1898 struct smack_known_list_elem *sklep =
1899 list_entry_rcu(list, struct smack_known_list_elem, list);
1900
1901 seq_puts(s, sklep->smk_label->smk_known);
1902 seq_putc(s, ' ');
1903
1904 return 0;
1905}
1906
1907static const struct seq_operations onlycap_seq_ops = {
1908 .start = onlycap_seq_start,
1909 .next = onlycap_seq_next,
1910 .show = onlycap_seq_show,
1911 .stop = smk_seq_stop,
1912};
1913
1914static int smk_open_onlycap(struct inode *inode, struct file *file)
1915{
1916 return seq_open(file, &onlycap_seq_ops);
1917}
1918
1919/**
1920 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1921 * The caller must hold appropriate mutex to prevent concurrent modifications
1922 * to the public list.
1923 * Private list is assumed to be not accessible to other threads yet.
1924 *
1925 * @public: public list
1926 * @private: private list
1927 */
1928static void smk_list_swap_rcu(struct list_head *public,
1929 struct list_head *private)
1930{
1931 struct list_head *first, *last;
1932
1933 if (list_empty(public)) {
1934 list_splice_init_rcu(private, public, synchronize_rcu);
1935 } else {
1936 /* Remember public list before replacing it */
1937 first = public->next;
1938 last = public->prev;
1939
1940 /* Publish private list in place of public in RCU-safe way */
1941 private->prev->next = public;
1942 private->next->prev = public;
1943 rcu_assign_pointer(public->next, private->next);
1944 public->prev = private->prev;
1945
1946 synchronize_rcu();
1947
1948 /* When all readers are done with the old public list,
1949 * attach it in place of private */
1950 private->next = first;
1951 private->prev = last;
1952 first->prev = private;
1953 last->next = private;
1954 }
1955}
1956
1957/**
1958 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1959 *
1960 * @data: the string to parse
1961 * @list: destination list
1962 *
1963 * Returns zero on success or error code, as appropriate
1964 */
1965static int smk_parse_label_list(char *data, struct list_head *list)
1966{
1967 char *tok;
1968 struct smack_known *skp;
1969 struct smack_known_list_elem *sklep;
1970
1971 while ((tok = strsep(&data, " ")) != NULL) {
1972 if (!*tok)
1973 continue;
1974
1975 skp = smk_import_entry(tok, 0);
1976 if (IS_ERR(skp))
1977 return PTR_ERR(skp);
1978
1979 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1980 if (sklep == NULL)
1981 return -ENOMEM;
1982
1983 sklep->smk_label = skp;
1984 list_add(&sklep->list, list);
1985 }
1986
1987 return 0;
1988}
1989
1990/**
1991 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1992 * @list: header pointer of the list to destroy
1993 */
1994void smk_destroy_label_list(struct list_head *list)
1995{
1996 struct smack_known_list_elem *sklep;
1997 struct smack_known_list_elem *sklep2;
1998
1999 list_for_each_entry_safe(sklep, sklep2, list, list)
2000 kfree(sklep);
2001
2002 INIT_LIST_HEAD(list);
2003}
2004
2005/**
2006 * smk_write_onlycap - write() for smackfs/onlycap
2007 * @file: file pointer, not actually used
2008 * @buf: where to get the data from
2009 * @count: bytes sent
2010 * @ppos: where to start
2011 *
2012 * Returns number of bytes written or error code, as appropriate
2013 */
2014static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2015 size_t count, loff_t *ppos)
2016{
2017 char *data;
2018 LIST_HEAD(list_tmp);
2019 int rc;
2020
2021 if (!smack_privileged(CAP_MAC_ADMIN))
2022 return -EPERM;
2023
2024 if (count > PAGE_SIZE)
2025 return -EINVAL;
2026
2027 data = memdup_user_nul(buf, count);
2028 if (IS_ERR(data))
2029 return PTR_ERR(data);
2030
2031 rc = smk_parse_label_list(data, &list_tmp);
2032 kfree(data);
2033
2034 /*
2035 * Clear the smack_onlycap on invalid label errors. This means
2036 * that we can pass a null string to unset the onlycap value.
2037 *
2038 * Importing will also reject a label beginning with '-',
2039 * so "-usecapabilities" will also work.
2040 *
2041 * But do so only on invalid label, not on system errors.
2042 * The invalid label must be first to count as clearing attempt.
2043 */
2044 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2045 mutex_lock(&smack_onlycap_lock);
2046 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2047 mutex_unlock(&smack_onlycap_lock);
2048 rc = count;
2049 }
2050
2051 smk_destroy_label_list(&list_tmp);
2052
2053 return rc;
2054}
2055
2056static const struct file_operations smk_onlycap_ops = {
2057 .open = smk_open_onlycap,
2058 .read = seq_read,
2059 .write = smk_write_onlycap,
2060 .llseek = seq_lseek,
2061 .release = seq_release,
2062};
2063
2064#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2065/**
2066 * smk_read_unconfined - read() for smackfs/unconfined
2067 * @filp: file pointer, not actually used
2068 * @buf: where to put the result
2069 * @cn: maximum to send along
2070 * @ppos: where to start
2071 *
2072 * Returns number of bytes read or error code, as appropriate
2073 */
2074static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2075 size_t cn, loff_t *ppos)
2076{
2077 char *smack = "";
2078 ssize_t rc = -EINVAL;
2079 int asize;
2080
2081 if (*ppos != 0)
2082 return 0;
2083
2084 if (smack_unconfined != NULL)
2085 smack = smack_unconfined->smk_known;
2086
2087 asize = strlen(smack) + 1;
2088
2089 if (cn >= asize)
2090 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2091
2092 return rc;
2093}
2094
2095/**
2096 * smk_write_unconfined - write() for smackfs/unconfined
2097 * @file: file pointer, not actually used
2098 * @buf: where to get the data from
2099 * @count: bytes sent
2100 * @ppos: where to start
2101 *
2102 * Returns number of bytes written or error code, as appropriate
2103 */
2104static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2105 size_t count, loff_t *ppos)
2106{
2107 char *data;
2108 struct smack_known *skp;
2109 int rc = count;
2110
2111 if (!smack_privileged(CAP_MAC_ADMIN))
2112 return -EPERM;
2113
2114 if (count > PAGE_SIZE)
2115 return -EINVAL;
2116
2117 data = memdup_user_nul(buf, count);
2118 if (IS_ERR(data))
2119 return PTR_ERR(data);
2120
2121 /*
2122 * Clear the smack_unconfined on invalid label errors. This means
2123 * that we can pass a null string to unset the unconfined value.
2124 *
2125 * Importing will also reject a label beginning with '-',
2126 * so "-confine" will also work.
2127 *
2128 * But do so only on invalid label, not on system errors.
2129 */
2130 skp = smk_import_entry(data, count);
2131 if (PTR_ERR(skp) == -EINVAL)
2132 skp = NULL;
2133 else if (IS_ERR(skp)) {
2134 rc = PTR_ERR(skp);
2135 goto freeout;
2136 }
2137
2138 smack_unconfined = skp;
2139
2140freeout:
2141 kfree(data);
2142 return rc;
2143}
2144
2145static const struct file_operations smk_unconfined_ops = {
2146 .read = smk_read_unconfined,
2147 .write = smk_write_unconfined,
2148 .llseek = default_llseek,
2149};
2150#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2151
2152/**
2153 * smk_read_logging - read() for /smack/logging
2154 * @filp: file pointer, not actually used
2155 * @buf: where to put the result
2156 * @count: maximum to send along
2157 * @ppos: where to start
2158 *
2159 * Returns number of bytes read or error code, as appropriate
2160 */
2161static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2162 size_t count, loff_t *ppos)
2163{
2164 char temp[32];
2165 ssize_t rc;
2166
2167 if (*ppos != 0)
2168 return 0;
2169
2170 sprintf(temp, "%d\n", log_policy);
2171 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2172 return rc;
2173}
2174
2175/**
2176 * smk_write_logging - write() for /smack/logging
2177 * @file: file pointer, not actually used
2178 * @buf: where to get the data from
2179 * @count: bytes sent
2180 * @ppos: where to start
2181 *
2182 * Returns number of bytes written or error code, as appropriate
2183 */
2184static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2185 size_t count, loff_t *ppos)
2186{
2187 char temp[32];
2188 int i;
2189
2190 if (!smack_privileged(CAP_MAC_ADMIN))
2191 return -EPERM;
2192
2193 if (count >= sizeof(temp) || count == 0)
2194 return -EINVAL;
2195
2196 if (copy_from_user(temp, buf, count) != 0)
2197 return -EFAULT;
2198
2199 temp[count] = '\0';
2200
2201 if (sscanf(temp, "%d", &i) != 1)
2202 return -EINVAL;
2203 if (i < 0 || i > 3)
2204 return -EINVAL;
2205 log_policy = i;
2206 return count;
2207}
2208
2209
2210
2211static const struct file_operations smk_logging_ops = {
2212 .read = smk_read_logging,
2213 .write = smk_write_logging,
2214 .llseek = default_llseek,
2215};
2216
2217/*
2218 * Seq_file read operations for /smack/load-self
2219 */
2220
2221static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2222{
2223 struct task_smack *tsp = smack_cred(current_cred());
2224
2225 return smk_seq_start(s, pos, &tsp->smk_rules);
2226}
2227
2228static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2229{
2230 struct task_smack *tsp = smack_cred(current_cred());
2231
2232 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2233}
2234
2235static int load_self_seq_show(struct seq_file *s, void *v)
2236{
2237 struct list_head *list = v;
2238 struct smack_rule *srp =
2239 list_entry_rcu(list, struct smack_rule, list);
2240
2241 smk_rule_show(s, srp, SMK_LABELLEN);
2242
2243 return 0;
2244}
2245
2246static const struct seq_operations load_self_seq_ops = {
2247 .start = load_self_seq_start,
2248 .next = load_self_seq_next,
2249 .show = load_self_seq_show,
2250 .stop = smk_seq_stop,
2251};
2252
2253
2254/**
2255 * smk_open_load_self - open() for /smack/load-self2
2256 * @inode: inode structure representing file
2257 * @file: "load" file pointer
2258 *
2259 * For reading, use load_seq_* seq_file reading operations.
2260 */
2261static int smk_open_load_self(struct inode *inode, struct file *file)
2262{
2263 return seq_open(file, &load_self_seq_ops);
2264}
2265
2266/**
2267 * smk_write_load_self - write() for /smack/load-self
2268 * @file: file pointer, not actually used
2269 * @buf: where to get the data from
2270 * @count: bytes sent
2271 * @ppos: where to start - must be 0
2272 *
2273 */
2274static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2275 size_t count, loff_t *ppos)
2276{
2277 struct task_smack *tsp = smack_cred(current_cred());
2278
2279 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2280 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2281}
2282
2283static const struct file_operations smk_load_self_ops = {
2284 .open = smk_open_load_self,
2285 .read = seq_read,
2286 .llseek = seq_lseek,
2287 .write = smk_write_load_self,
2288 .release = seq_release,
2289};
2290
2291/**
2292 * smk_user_access - handle access check transaction
2293 * @file: file pointer
2294 * @buf: data from user space
2295 * @count: bytes sent
2296 * @ppos: where to start - must be 0
2297 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
2298 */
2299static ssize_t smk_user_access(struct file *file, const char __user *buf,
2300 size_t count, loff_t *ppos, int format)
2301{
2302 struct smack_parsed_rule rule;
2303 char *data;
2304 int res;
2305
2306 data = simple_transaction_get(file, buf, count);
2307 if (IS_ERR(data))
2308 return PTR_ERR(data);
2309
2310 if (format == SMK_FIXED24_FMT) {
2311 if (count < SMK_LOADLEN)
2312 return -EINVAL;
2313 res = smk_parse_rule(data, &rule, 0);
2314 } else {
2315 /*
2316 * simple_transaction_get() returns null-terminated data
2317 */
2318 res = smk_parse_long_rule(data, &rule, 0, 3);
2319 }
2320
2321 if (res >= 0)
2322 res = smk_access(rule.smk_subject, rule.smk_object,
2323 rule.smk_access1, NULL);
2324 else if (res != -ENOENT)
2325 return res;
2326
2327 /*
2328 * smk_access() can return a value > 0 in the "bringup" case.
2329 */
2330 data[0] = res >= 0 ? '1' : '0';
2331 data[1] = '\0';
2332
2333 simple_transaction_set(file, 2);
2334
2335 if (format == SMK_FIXED24_FMT)
2336 return SMK_LOADLEN;
2337 return count;
2338}
2339
2340/**
2341 * smk_write_access - handle access check transaction
2342 * @file: file pointer
2343 * @buf: data from user space
2344 * @count: bytes sent
2345 * @ppos: where to start - must be 0
2346 */
2347static ssize_t smk_write_access(struct file *file, const char __user *buf,
2348 size_t count, loff_t *ppos)
2349{
2350 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2351}
2352
2353static const struct file_operations smk_access_ops = {
2354 .write = smk_write_access,
2355 .read = simple_transaction_read,
2356 .release = simple_transaction_release,
2357 .llseek = generic_file_llseek,
2358};
2359
2360
2361/*
2362 * Seq_file read operations for /smack/load2
2363 */
2364
2365static int load2_seq_show(struct seq_file *s, void *v)
2366{
2367 struct list_head *list = v;
2368 struct smack_rule *srp;
2369 struct smack_known *skp =
2370 list_entry_rcu(list, struct smack_known, list);
2371
2372 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2373 smk_rule_show(s, srp, SMK_LONGLABEL);
2374
2375 return 0;
2376}
2377
2378static const struct seq_operations load2_seq_ops = {
2379 .start = load2_seq_start,
2380 .next = load2_seq_next,
2381 .show = load2_seq_show,
2382 .stop = smk_seq_stop,
2383};
2384
2385/**
2386 * smk_open_load2 - open() for /smack/load2
2387 * @inode: inode structure representing file
2388 * @file: "load2" file pointer
2389 *
2390 * For reading, use load2_seq_* seq_file reading operations.
2391 */
2392static int smk_open_load2(struct inode *inode, struct file *file)
2393{
2394 return seq_open(file, &load2_seq_ops);
2395}
2396
2397/**
2398 * smk_write_load2 - write() for /smack/load2
2399 * @file: file pointer, not actually used
2400 * @buf: where to get the data from
2401 * @count: bytes sent
2402 * @ppos: where to start - must be 0
2403 *
2404 */
2405static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2406 size_t count, loff_t *ppos)
2407{
2408 /*
2409 * Must have privilege.
2410 */
2411 if (!smack_privileged(CAP_MAC_ADMIN))
2412 return -EPERM;
2413
2414 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2415 SMK_LONG_FMT);
2416}
2417
2418static const struct file_operations smk_load2_ops = {
2419 .open = smk_open_load2,
2420 .read = seq_read,
2421 .llseek = seq_lseek,
2422 .write = smk_write_load2,
2423 .release = seq_release,
2424};
2425
2426/*
2427 * Seq_file read operations for /smack/load-self2
2428 */
2429
2430static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2431{
2432 struct task_smack *tsp = smack_cred(current_cred());
2433
2434 return smk_seq_start(s, pos, &tsp->smk_rules);
2435}
2436
2437static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2438{
2439 struct task_smack *tsp = smack_cred(current_cred());
2440
2441 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2442}
2443
2444static int load_self2_seq_show(struct seq_file *s, void *v)
2445{
2446 struct list_head *list = v;
2447 struct smack_rule *srp =
2448 list_entry_rcu(list, struct smack_rule, list);
2449
2450 smk_rule_show(s, srp, SMK_LONGLABEL);
2451
2452 return 0;
2453}
2454
2455static const struct seq_operations load_self2_seq_ops = {
2456 .start = load_self2_seq_start,
2457 .next = load_self2_seq_next,
2458 .show = load_self2_seq_show,
2459 .stop = smk_seq_stop,
2460};
2461
2462/**
2463 * smk_open_load_self2 - open() for /smack/load-self2
2464 * @inode: inode structure representing file
2465 * @file: "load" file pointer
2466 *
2467 * For reading, use load_seq_* seq_file reading operations.
2468 */
2469static int smk_open_load_self2(struct inode *inode, struct file *file)
2470{
2471 return seq_open(file, &load_self2_seq_ops);
2472}
2473
2474/**
2475 * smk_write_load_self2 - write() for /smack/load-self2
2476 * @file: file pointer, not actually used
2477 * @buf: where to get the data from
2478 * @count: bytes sent
2479 * @ppos: where to start - must be 0
2480 *
2481 */
2482static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2483 size_t count, loff_t *ppos)
2484{
2485 struct task_smack *tsp = smack_cred(current_cred());
2486
2487 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2488 &tsp->smk_rules_lock, SMK_LONG_FMT);
2489}
2490
2491static const struct file_operations smk_load_self2_ops = {
2492 .open = smk_open_load_self2,
2493 .read = seq_read,
2494 .llseek = seq_lseek,
2495 .write = smk_write_load_self2,
2496 .release = seq_release,
2497};
2498
2499/**
2500 * smk_write_access2 - handle access check transaction
2501 * @file: file pointer
2502 * @buf: data from user space
2503 * @count: bytes sent
2504 * @ppos: where to start - must be 0
2505 */
2506static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2507 size_t count, loff_t *ppos)
2508{
2509 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2510}
2511
2512static const struct file_operations smk_access2_ops = {
2513 .write = smk_write_access2,
2514 .read = simple_transaction_read,
2515 .release = simple_transaction_release,
2516 .llseek = generic_file_llseek,
2517};
2518
2519/**
2520 * smk_write_revoke_subj - write() for /smack/revoke-subject
2521 * @file: file pointer
2522 * @buf: data from user space
2523 * @count: bytes sent
2524 * @ppos: where to start - must be 0
2525 */
2526static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2527 size_t count, loff_t *ppos)
2528{
2529 char *data;
2530 const char *cp;
2531 struct smack_known *skp;
2532 struct smack_rule *sp;
2533 struct list_head *rule_list;
2534 struct mutex *rule_lock;
2535 int rc = count;
2536
2537 if (*ppos != 0)
2538 return -EINVAL;
2539
2540 if (!smack_privileged(CAP_MAC_ADMIN))
2541 return -EPERM;
2542
2543 if (count == 0 || count > SMK_LONGLABEL)
2544 return -EINVAL;
2545
2546 data = memdup_user(buf, count);
2547 if (IS_ERR(data))
2548 return PTR_ERR(data);
2549
2550 cp = smk_parse_smack(data, count);
2551 if (IS_ERR(cp)) {
2552 rc = PTR_ERR(cp);
2553 goto out_data;
2554 }
2555
2556 skp = smk_find_entry(cp);
2557 if (skp == NULL)
2558 goto out_cp;
2559
2560 rule_list = &skp->smk_rules;
2561 rule_lock = &skp->smk_rules_lock;
2562
2563 mutex_lock(rule_lock);
2564
2565 list_for_each_entry_rcu(sp, rule_list, list)
2566 sp->smk_access = 0;
2567
2568 mutex_unlock(rule_lock);
2569
2570out_cp:
2571 kfree(cp);
2572out_data:
2573 kfree(data);
2574
2575 return rc;
2576}
2577
2578static const struct file_operations smk_revoke_subj_ops = {
2579 .write = smk_write_revoke_subj,
2580 .read = simple_transaction_read,
2581 .release = simple_transaction_release,
2582 .llseek = generic_file_llseek,
2583};
2584
2585/**
2586 * smk_init_sysfs - initialize /sys/fs/smackfs
2587 *
2588 */
2589static int smk_init_sysfs(void)
2590{
2591 return sysfs_create_mount_point(fs_kobj, "smackfs");
2592}
2593
2594/**
2595 * smk_write_change_rule - write() for /smack/change-rule
2596 * @file: file pointer
2597 * @buf: data from user space
2598 * @count: bytes sent
2599 * @ppos: where to start - must be 0
2600 */
2601static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2602 size_t count, loff_t *ppos)
2603{
2604 /*
2605 * Must have privilege.
2606 */
2607 if (!smack_privileged(CAP_MAC_ADMIN))
2608 return -EPERM;
2609
2610 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2611 SMK_CHANGE_FMT);
2612}
2613
2614static const struct file_operations smk_change_rule_ops = {
2615 .write = smk_write_change_rule,
2616 .read = simple_transaction_read,
2617 .release = simple_transaction_release,
2618 .llseek = generic_file_llseek,
2619};
2620
2621/**
2622 * smk_read_syslog - read() for smackfs/syslog
2623 * @filp: file pointer, not actually used
2624 * @buf: where to put the result
2625 * @cn: maximum to send along
2626 * @ppos: where to start
2627 *
2628 * Returns number of bytes read or error code, as appropriate
2629 */
2630static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2631 size_t cn, loff_t *ppos)
2632{
2633 struct smack_known *skp;
2634 ssize_t rc = -EINVAL;
2635 int asize;
2636
2637 if (*ppos != 0)
2638 return 0;
2639
2640 if (smack_syslog_label == NULL)
2641 skp = &smack_known_star;
2642 else
2643 skp = smack_syslog_label;
2644
2645 asize = strlen(skp->smk_known) + 1;
2646
2647 if (cn >= asize)
2648 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2649 asize);
2650
2651 return rc;
2652}
2653
2654/**
2655 * smk_write_syslog - write() for smackfs/syslog
2656 * @file: file pointer, not actually used
2657 * @buf: where to get the data from
2658 * @count: bytes sent
2659 * @ppos: where to start
2660 *
2661 * Returns number of bytes written or error code, as appropriate
2662 */
2663static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2664 size_t count, loff_t *ppos)
2665{
2666 char *data;
2667 struct smack_known *skp;
2668 int rc = count;
2669
2670 if (!smack_privileged(CAP_MAC_ADMIN))
2671 return -EPERM;
2672
2673 /* Enough data must be present */
2674 if (count == 0 || count > PAGE_SIZE)
2675 return -EINVAL;
2676
2677 data = memdup_user_nul(buf, count);
2678 if (IS_ERR(data))
2679 return PTR_ERR(data);
2680
2681 skp = smk_import_entry(data, count);
2682 if (IS_ERR(skp))
2683 rc = PTR_ERR(skp);
2684 else
2685 smack_syslog_label = skp;
2686
2687 kfree(data);
2688 return rc;
2689}
2690
2691static const struct file_operations smk_syslog_ops = {
2692 .read = smk_read_syslog,
2693 .write = smk_write_syslog,
2694 .llseek = default_llseek,
2695};
2696
2697/*
2698 * Seq_file read operations for /smack/relabel-self
2699 */
2700
2701static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2702{
2703 struct task_smack *tsp = smack_cred(current_cred());
2704
2705 return smk_seq_start(s, pos, &tsp->smk_relabel);
2706}
2707
2708static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2709{
2710 struct task_smack *tsp = smack_cred(current_cred());
2711
2712 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2713}
2714
2715static int relabel_self_seq_show(struct seq_file *s, void *v)
2716{
2717 struct list_head *list = v;
2718 struct smack_known_list_elem *sklep =
2719 list_entry(list, struct smack_known_list_elem, list);
2720
2721 seq_puts(s, sklep->smk_label->smk_known);
2722 seq_putc(s, ' ');
2723
2724 return 0;
2725}
2726
2727static const struct seq_operations relabel_self_seq_ops = {
2728 .start = relabel_self_seq_start,
2729 .next = relabel_self_seq_next,
2730 .show = relabel_self_seq_show,
2731 .stop = smk_seq_stop,
2732};
2733
2734/**
2735 * smk_open_relabel_self - open() for /smack/relabel-self
2736 * @inode: inode structure representing file
2737 * @file: "relabel-self" file pointer
2738 *
2739 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2740 * file_operations
2741 */
2742static int smk_open_relabel_self(struct inode *inode, struct file *file)
2743{
2744 return seq_open(file, &relabel_self_seq_ops);
2745}
2746
2747/**
2748 * smk_write_relabel_self - write() for /smack/relabel-self
2749 * @file: file pointer, not actually used
2750 * @buf: where to get the data from
2751 * @count: bytes sent
2752 * @ppos: where to start - must be 0
2753 *
2754 */
2755static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2756 size_t count, loff_t *ppos)
2757{
2758 char *data;
2759 int rc;
2760 LIST_HEAD(list_tmp);
2761
2762 /*
2763 * Must have privilege.
2764 */
2765 if (!smack_privileged(CAP_MAC_ADMIN))
2766 return -EPERM;
2767
2768 /*
2769 * No partial write.
2770 * Enough data must be present.
2771 */
2772 if (*ppos != 0)
2773 return -EINVAL;
2774 if (count == 0 || count > PAGE_SIZE)
2775 return -EINVAL;
2776
2777 data = memdup_user_nul(buf, count);
2778 if (IS_ERR(data))
2779 return PTR_ERR(data);
2780
2781 rc = smk_parse_label_list(data, &list_tmp);
2782 kfree(data);
2783
2784 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2785 struct cred *new;
2786 struct task_smack *tsp;
2787
2788 new = prepare_creds();
2789 if (!new) {
2790 rc = -ENOMEM;
2791 goto out;
2792 }
2793 tsp = smack_cred(new);
2794 smk_destroy_label_list(&tsp->smk_relabel);
2795 list_splice(&list_tmp, &tsp->smk_relabel);
2796 commit_creds(new);
2797 return count;
2798 }
2799out:
2800 smk_destroy_label_list(&list_tmp);
2801 return rc;
2802}
2803
2804static const struct file_operations smk_relabel_self_ops = {
2805 .open = smk_open_relabel_self,
2806 .read = seq_read,
2807 .llseek = seq_lseek,
2808 .write = smk_write_relabel_self,
2809 .release = seq_release,
2810};
2811
2812/**
2813 * smk_read_ptrace - read() for /smack/ptrace
2814 * @filp: file pointer, not actually used
2815 * @buf: where to put the result
2816 * @count: maximum to send along
2817 * @ppos: where to start
2818 *
2819 * Returns number of bytes read or error code, as appropriate
2820 */
2821static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2822 size_t count, loff_t *ppos)
2823{
2824 char temp[32];
2825 ssize_t rc;
2826
2827 if (*ppos != 0)
2828 return 0;
2829
2830 sprintf(temp, "%d\n", smack_ptrace_rule);
2831 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2832 return rc;
2833}
2834
2835/**
2836 * smk_write_ptrace - write() for /smack/ptrace
2837 * @file: file pointer
2838 * @buf: data from user space
2839 * @count: bytes sent
2840 * @ppos: where to start - must be 0
2841 */
2842static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2843 size_t count, loff_t *ppos)
2844{
2845 char temp[32];
2846 int i;
2847
2848 if (!smack_privileged(CAP_MAC_ADMIN))
2849 return -EPERM;
2850
2851 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2852 return -EINVAL;
2853
2854 if (copy_from_user(temp, buf, count) != 0)
2855 return -EFAULT;
2856
2857 temp[count] = '\0';
2858
2859 if (sscanf(temp, "%d", &i) != 1)
2860 return -EINVAL;
2861 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2862 return -EINVAL;
2863 smack_ptrace_rule = i;
2864
2865 return count;
2866}
2867
2868static const struct file_operations smk_ptrace_ops = {
2869 .write = smk_write_ptrace,
2870 .read = smk_read_ptrace,
2871 .llseek = default_llseek,
2872};
2873
2874/**
2875 * smk_fill_super - fill the smackfs superblock
2876 * @sb: the empty superblock
2877 * @fc: unused
2878 *
2879 * Fill in the well known entries for the smack filesystem
2880 *
2881 * Returns 0 on success, an error code on failure
2882 */
2883static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2884{
2885 int rc;
2886
2887 static const struct tree_descr smack_files[] = {
2888 [SMK_LOAD] = {
2889 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2890 [SMK_CIPSO] = {
2891 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2892 [SMK_DOI] = {
2893 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2894 [SMK_DIRECT] = {
2895 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2896 [SMK_AMBIENT] = {
2897 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2898 [SMK_NET4ADDR] = {
2899 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2900 [SMK_ONLYCAP] = {
2901 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2902 [SMK_LOGGING] = {
2903 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2904 [SMK_LOAD_SELF] = {
2905 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2906 [SMK_ACCESSES] = {
2907 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2908 [SMK_MAPPED] = {
2909 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2910 [SMK_LOAD2] = {
2911 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2912 [SMK_LOAD_SELF2] = {
2913 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2914 [SMK_ACCESS2] = {
2915 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2916 [SMK_CIPSO2] = {
2917 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2918 [SMK_REVOKE_SUBJ] = {
2919 "revoke-subject", &smk_revoke_subj_ops,
2920 S_IRUGO|S_IWUSR},
2921 [SMK_CHANGE_RULE] = {
2922 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2923 [SMK_SYSLOG] = {
2924 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2925 [SMK_PTRACE] = {
2926 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2927#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2928 [SMK_UNCONFINED] = {
2929 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2930#endif
2931#if IS_ENABLED(CONFIG_IPV6)
2932 [SMK_NET6ADDR] = {
2933 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2934#endif /* CONFIG_IPV6 */
2935 [SMK_RELABEL_SELF] = {
2936 "relabel-self", &smk_relabel_self_ops,
2937 S_IRUGO|S_IWUGO},
2938 /* last one */
2939 {""}
2940 };
2941
2942 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2943 if (rc != 0) {
2944 printk(KERN_ERR "%s failed %d while creating inodes\n",
2945 __func__, rc);
2946 return rc;
2947 }
2948
2949 return 0;
2950}
2951
2952/**
2953 * smk_get_tree - get the smackfs superblock
2954 * @fc: The mount context, including any options
2955 *
2956 * Just passes everything along.
2957 *
2958 * Returns what the lower level code does.
2959 */
2960static int smk_get_tree(struct fs_context *fc)
2961{
2962 return get_tree_single(fc, smk_fill_super);
2963}
2964
2965static const struct fs_context_operations smk_context_ops = {
2966 .get_tree = smk_get_tree,
2967};
2968
2969/**
2970 * smk_init_fs_context - Initialise a filesystem context for smackfs
2971 * @fc: The blank mount context
2972 */
2973static int smk_init_fs_context(struct fs_context *fc)
2974{
2975 fc->ops = &smk_context_ops;
2976 return 0;
2977}
2978
2979static struct file_system_type smk_fs_type = {
2980 .name = "smackfs",
2981 .init_fs_context = smk_init_fs_context,
2982 .kill_sb = kill_litter_super,
2983};
2984
2985static struct vfsmount *smackfs_mount;
2986
2987/**
2988 * init_smk_fs - get the smackfs superblock
2989 *
2990 * register the smackfs
2991 *
2992 * Do not register smackfs if Smack wasn't enabled
2993 * on boot. We can not put this method normally under the
2994 * smack_init() code path since the security subsystem get
2995 * initialized before the vfs caches.
2996 *
2997 * Returns true if we were not chosen on boot or if
2998 * we were chosen and filesystem registration succeeded.
2999 */
3000static int __init init_smk_fs(void)
3001{
3002 int err;
3003 int rc;
3004
3005 if (smack_enabled == 0)
3006 return 0;
3007
3008 err = smk_init_sysfs();
3009 if (err)
3010 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3011
3012 err = register_filesystem(&smk_fs_type);
3013 if (!err) {
3014 smackfs_mount = kern_mount(&smk_fs_type);
3015 if (IS_ERR(smackfs_mount)) {
3016 printk(KERN_ERR "smackfs: could not mount!\n");
3017 err = PTR_ERR(smackfs_mount);
3018 smackfs_mount = NULL;
3019 }
3020 }
3021
3022 smk_cipso_doi();
3023 smk_unlbl_ambient(NULL);
3024
3025 rc = smack_populate_secattr(&smack_known_floor);
3026 if (err == 0 && rc < 0)
3027 err = rc;
3028 rc = smack_populate_secattr(&smack_known_hat);
3029 if (err == 0 && rc < 0)
3030 err = rc;
3031 rc = smack_populate_secattr(&smack_known_huh);
3032 if (err == 0 && rc < 0)
3033 err = rc;
3034 rc = smack_populate_secattr(&smack_known_star);
3035 if (err == 0 && rc < 0)
3036 err = rc;
3037 rc = smack_populate_secattr(&smack_known_web);
3038 if (err == 0 && rc < 0)
3039 err = rc;
3040
3041 return err;
3042}
3043
3044__initcall(init_smk_fs);
1/*
2 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
3 *
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.
7 *
8 * Authors:
9 * Casey Schaufler <casey@schaufler-ca.com>
10 * Ahmed S. Darwish <darwish.07@gmail.com>
11 *
12 * Special thanks to the authors of selinuxfs.
13 *
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * James Morris <jmorris@redhat.com>
16 *
17 */
18
19#include <linux/kernel.h>
20#include <linux/vmalloc.h>
21#include <linux/security.h>
22#include <linux/mutex.h>
23#include <linux/slab.h>
24#include <net/net_namespace.h>
25#include <net/cipso_ipv4.h>
26#include <linux/seq_file.h>
27#include <linux/ctype.h>
28#include <linux/audit.h>
29#include <linux/magic.h>
30#include "smack.h"
31
32#define BEBITS (sizeof(__be32) * 8)
33/*
34 * smackfs pseudo filesystem.
35 */
36
37enum smk_inos {
38 SMK_ROOT_INO = 2,
39 SMK_LOAD = 3, /* load policy */
40 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
41 SMK_DOI = 5, /* CIPSO DOI */
42 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
43 SMK_AMBIENT = 7, /* internet ambient label */
44 SMK_NET4ADDR = 8, /* single label hosts */
45 SMK_ONLYCAP = 9, /* the only "capable" label */
46 SMK_LOGGING = 10, /* logging */
47 SMK_LOAD_SELF = 11, /* task specific rules */
48 SMK_ACCESSES = 12, /* access policy */
49 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
50 SMK_LOAD2 = 14, /* load policy with long labels */
51 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
52 SMK_ACCESS2 = 16, /* make an access check with long labels */
53 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
54 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
55 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
56 SMK_SYSLOG = 20, /* change syslog label) */
57 SMK_PTRACE = 21, /* set ptrace rule */
58#ifdef CONFIG_SECURITY_SMACK_BRINGUP
59 SMK_UNCONFINED = 22, /* define an unconfined label */
60#endif
61#if IS_ENABLED(CONFIG_IPV6)
62 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
63#endif /* CONFIG_IPV6 */
64 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
65};
66
67/*
68 * List locks
69 */
70static DEFINE_MUTEX(smack_cipso_lock);
71static DEFINE_MUTEX(smack_ambient_lock);
72static DEFINE_MUTEX(smk_net4addr_lock);
73#if IS_ENABLED(CONFIG_IPV6)
74static DEFINE_MUTEX(smk_net6addr_lock);
75#endif /* CONFIG_IPV6 */
76
77/*
78 * This is the "ambient" label for network traffic.
79 * If it isn't somehow marked, use this.
80 * It can be reset via smackfs/ambient
81 */
82struct smack_known *smack_net_ambient;
83
84/*
85 * This is the level in a CIPSO header that indicates a
86 * smack label is contained directly in the category set.
87 * It can be reset via smackfs/direct
88 */
89int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
90
91/*
92 * This is the level in a CIPSO header that indicates a
93 * secid is contained directly in the category set.
94 * It can be reset via smackfs/mapped
95 */
96int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
97
98#ifdef CONFIG_SECURITY_SMACK_BRINGUP
99/*
100 * Allow one label to be unconfined. This is for
101 * debugging and application bring-up purposes only.
102 * It is bad and wrong, but everyone seems to expect
103 * to have it.
104 */
105struct smack_known *smack_unconfined;
106#endif
107
108/*
109 * If this value is set restrict syslog use to the label specified.
110 * It can be reset via smackfs/syslog
111 */
112struct smack_known *smack_syslog_label;
113
114/*
115 * Ptrace current rule
116 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
117 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
118 * CAP_SYS_PTRACE
119 * SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect
120 */
121int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
122
123/*
124 * Certain IP addresses may be designated as single label hosts.
125 * Packets are sent there unlabeled, but only from tasks that
126 * can write to the specified label.
127 */
128
129LIST_HEAD(smk_net4addr_list);
130#if IS_ENABLED(CONFIG_IPV6)
131LIST_HEAD(smk_net6addr_list);
132#endif /* CONFIG_IPV6 */
133
134/*
135 * Rule lists are maintained for each label.
136 * This master list is just for reading /smack/load and /smack/load2.
137 */
138struct smack_master_list {
139 struct list_head list;
140 struct smack_rule *smk_rule;
141};
142
143static LIST_HEAD(smack_rule_list);
144
145struct smack_parsed_rule {
146 struct smack_known *smk_subject;
147 struct smack_known *smk_object;
148 int smk_access1;
149 int smk_access2;
150};
151
152static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
153
154/*
155 * Values for parsing cipso rules
156 * SMK_DIGITLEN: Length of a digit field in a rule.
157 * SMK_CIPSOMIN: Minimum possible cipso rule length.
158 * SMK_CIPSOMAX: Maximum possible cipso rule length.
159 */
160#define SMK_DIGITLEN 4
161#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
162#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
163
164/*
165 * Values for parsing MAC rules
166 * SMK_ACCESS: Maximum possible combination of access permissions
167 * SMK_ACCESSLEN: Maximum length for a rule access field
168 * SMK_LOADLEN: Smack rule length
169 */
170#define SMK_OACCESS "rwxa"
171#define SMK_ACCESS "rwxatl"
172#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
173#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
174#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
175#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
176
177/*
178 * Stricly for CIPSO level manipulation.
179 * Set the category bit number in a smack label sized buffer.
180 */
181static inline void smack_catset_bit(unsigned int cat, char *catsetp)
182{
183 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
184 return;
185
186 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
187}
188
189/**
190 * smk_netlabel_audit_set - fill a netlbl_audit struct
191 * @nap: structure to fill
192 */
193static void smk_netlabel_audit_set(struct netlbl_audit *nap)
194{
195 struct smack_known *skp = smk_of_current();
196
197 nap->loginuid = audit_get_loginuid(current);
198 nap->sessionid = audit_get_sessionid(current);
199 nap->secid = skp->smk_secid;
200}
201
202/*
203 * Value for parsing single label host rules
204 * "1.2.3.4 X"
205 */
206#define SMK_NETLBLADDRMIN 9
207
208/**
209 * smk_set_access - add a rule to the rule list or replace an old rule
210 * @srp: the rule to add or replace
211 * @rule_list: the list of rules
212 * @rule_lock: the rule list lock
213 * @global: if non-zero, indicates a global rule
214 *
215 * Looks through the current subject/object/access list for
216 * the subject/object pair and replaces the access that was
217 * there. If the pair isn't found add it with the specified
218 * access.
219 *
220 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
221 * during the allocation of the new pair to add.
222 */
223static int smk_set_access(struct smack_parsed_rule *srp,
224 struct list_head *rule_list,
225 struct mutex *rule_lock, int global)
226{
227 struct smack_rule *sp;
228 struct smack_master_list *smlp;
229 int found = 0;
230 int rc = 0;
231
232 mutex_lock(rule_lock);
233
234 /*
235 * Because the object label is less likely to match
236 * than the subject label check it first
237 */
238 list_for_each_entry_rcu(sp, rule_list, list) {
239 if (sp->smk_object == srp->smk_object &&
240 sp->smk_subject == srp->smk_subject) {
241 found = 1;
242 sp->smk_access |= srp->smk_access1;
243 sp->smk_access &= ~srp->smk_access2;
244 break;
245 }
246 }
247
248 if (found == 0) {
249 sp = kzalloc(sizeof(*sp), GFP_KERNEL);
250 if (sp == NULL) {
251 rc = -ENOMEM;
252 goto out;
253 }
254
255 sp->smk_subject = srp->smk_subject;
256 sp->smk_object = srp->smk_object;
257 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
258
259 list_add_rcu(&sp->list, rule_list);
260 /*
261 * If this is a global as opposed to self and a new rule
262 * it needs to get added for reporting.
263 */
264 if (global) {
265 smlp = kzalloc(sizeof(*smlp), GFP_KERNEL);
266 if (smlp != NULL) {
267 smlp->smk_rule = sp;
268 list_add_rcu(&smlp->list, &smack_rule_list);
269 } else
270 rc = -ENOMEM;
271 }
272 }
273
274out:
275 mutex_unlock(rule_lock);
276 return rc;
277}
278
279/**
280 * smk_perm_from_str - parse smack accesses from a text string
281 * @string: a text string that contains a Smack accesses code
282 *
283 * Returns an integer with respective bits set for specified accesses.
284 */
285static int smk_perm_from_str(const char *string)
286{
287 int perm = 0;
288 const char *cp;
289
290 for (cp = string; ; cp++)
291 switch (*cp) {
292 case '-':
293 break;
294 case 'r':
295 case 'R':
296 perm |= MAY_READ;
297 break;
298 case 'w':
299 case 'W':
300 perm |= MAY_WRITE;
301 break;
302 case 'x':
303 case 'X':
304 perm |= MAY_EXEC;
305 break;
306 case 'a':
307 case 'A':
308 perm |= MAY_APPEND;
309 break;
310 case 't':
311 case 'T':
312 perm |= MAY_TRANSMUTE;
313 break;
314 case 'l':
315 case 'L':
316 perm |= MAY_LOCK;
317 break;
318 case 'b':
319 case 'B':
320 perm |= MAY_BRINGUP;
321 break;
322 default:
323 return perm;
324 }
325}
326
327/**
328 * smk_fill_rule - Fill Smack rule from strings
329 * @subject: subject label string
330 * @object: object label string
331 * @access1: access string
332 * @access2: string with permissions to be removed
333 * @rule: Smack rule
334 * @import: if non-zero, import labels
335 * @len: label length limit
336 *
337 * Returns 0 on success, appropriate error code on failure.
338 */
339static int smk_fill_rule(const char *subject, const char *object,
340 const char *access1, const char *access2,
341 struct smack_parsed_rule *rule, int import,
342 int len)
343{
344 const char *cp;
345 struct smack_known *skp;
346
347 if (import) {
348 rule->smk_subject = smk_import_entry(subject, len);
349 if (IS_ERR(rule->smk_subject))
350 return PTR_ERR(rule->smk_subject);
351
352 rule->smk_object = smk_import_entry(object, len);
353 if (IS_ERR(rule->smk_object))
354 return PTR_ERR(rule->smk_object);
355 } else {
356 cp = smk_parse_smack(subject, len);
357 if (IS_ERR(cp))
358 return PTR_ERR(cp);
359 skp = smk_find_entry(cp);
360 kfree(cp);
361 if (skp == NULL)
362 return -ENOENT;
363 rule->smk_subject = skp;
364
365 cp = smk_parse_smack(object, len);
366 if (IS_ERR(cp))
367 return PTR_ERR(cp);
368 skp = smk_find_entry(cp);
369 kfree(cp);
370 if (skp == NULL)
371 return -ENOENT;
372 rule->smk_object = skp;
373 }
374
375 rule->smk_access1 = smk_perm_from_str(access1);
376 if (access2)
377 rule->smk_access2 = smk_perm_from_str(access2);
378 else
379 rule->smk_access2 = ~rule->smk_access1;
380
381 return 0;
382}
383
384/**
385 * smk_parse_rule - parse Smack rule from load string
386 * @data: string to be parsed whose size is SMK_LOADLEN
387 * @rule: Smack rule
388 * @import: if non-zero, import labels
389 *
390 * Returns 0 on success, -1 on errors.
391 */
392static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
393 int import)
394{
395 int rc;
396
397 rc = smk_fill_rule(data, data + SMK_LABELLEN,
398 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
399 import, SMK_LABELLEN);
400 return rc;
401}
402
403/**
404 * smk_parse_long_rule - parse Smack rule from rule string
405 * @data: string to be parsed, null terminated
406 * @rule: Will be filled with Smack parsed rule
407 * @import: if non-zero, import labels
408 * @tokens: numer of substrings expected in data
409 *
410 * Returns number of processed bytes on success, -ERRNO on failure.
411 */
412static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
413 int import, int tokens)
414{
415 ssize_t cnt = 0;
416 char *tok[4];
417 int rc;
418 int i;
419
420 /*
421 * Parsing the rule in-place, filling all white-spaces with '\0'
422 */
423 for (i = 0; i < tokens; ++i) {
424 while (isspace(data[cnt]))
425 data[cnt++] = '\0';
426
427 if (data[cnt] == '\0')
428 /* Unexpected end of data */
429 return -EINVAL;
430
431 tok[i] = data + cnt;
432
433 while (data[cnt] && !isspace(data[cnt]))
434 ++cnt;
435 }
436 while (isspace(data[cnt]))
437 data[cnt++] = '\0';
438
439 while (i < 4)
440 tok[i++] = NULL;
441
442 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
443 return rc == 0 ? cnt : rc;
444}
445
446#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
447#define SMK_LONG_FMT 1 /* Variable long label format */
448#define SMK_CHANGE_FMT 2 /* Rule modification format */
449/**
450 * smk_write_rules_list - write() for any /smack rule file
451 * @file: file pointer, not actually used
452 * @buf: where to get the data from
453 * @count: bytes sent
454 * @ppos: where to start - must be 0
455 * @rule_list: the list of rules to write to
456 * @rule_lock: lock for the rule list
457 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
458 *
459 * Get one smack access rule from above.
460 * The format for SMK_LONG_FMT is:
461 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
462 * The format for SMK_FIXED24_FMT is exactly:
463 * "subject object rwxat"
464 * The format for SMK_CHANGE_FMT is:
465 * "subject<whitespace>object<whitespace>
466 * acc_enable<whitespace>acc_disable[<whitespace>...]"
467 */
468static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
469 size_t count, loff_t *ppos,
470 struct list_head *rule_list,
471 struct mutex *rule_lock, int format)
472{
473 struct smack_parsed_rule rule;
474 char *data;
475 int rc;
476 int trunc = 0;
477 int tokens;
478 ssize_t cnt = 0;
479
480 /*
481 * No partial writes.
482 * Enough data must be present.
483 */
484 if (*ppos != 0)
485 return -EINVAL;
486
487 if (format == SMK_FIXED24_FMT) {
488 /*
489 * Minor hack for backward compatibility
490 */
491 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
492 return -EINVAL;
493 } else {
494 if (count >= PAGE_SIZE) {
495 count = PAGE_SIZE - 1;
496 trunc = 1;
497 }
498 }
499
500 data = memdup_user_nul(buf, count);
501 if (IS_ERR(data))
502 return PTR_ERR(data);
503
504 /*
505 * In case of parsing only part of user buf,
506 * avoid having partial rule at the data buffer
507 */
508 if (trunc) {
509 while (count > 0 && (data[count - 1] != '\n'))
510 --count;
511 if (count == 0) {
512 rc = -EINVAL;
513 goto out;
514 }
515 }
516
517 data[count] = '\0';
518 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
519 while (cnt < count) {
520 if (format == SMK_FIXED24_FMT) {
521 rc = smk_parse_rule(data, &rule, 1);
522 if (rc < 0)
523 goto out;
524 cnt = count;
525 } else {
526 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
527 if (rc < 0)
528 goto out;
529 if (rc == 0) {
530 rc = -EINVAL;
531 goto out;
532 }
533 cnt += rc;
534 }
535
536 if (rule_list == NULL)
537 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
538 &rule.smk_subject->smk_rules_lock, 1);
539 else
540 rc = smk_set_access(&rule, rule_list, rule_lock, 0);
541
542 if (rc)
543 goto out;
544 }
545
546 rc = cnt;
547out:
548 kfree(data);
549 return rc;
550}
551
552/*
553 * Core logic for smackfs seq list operations.
554 */
555
556static void *smk_seq_start(struct seq_file *s, loff_t *pos,
557 struct list_head *head)
558{
559 struct list_head *list;
560 int i = *pos;
561
562 rcu_read_lock();
563 for (list = rcu_dereference(list_next_rcu(head));
564 list != head;
565 list = rcu_dereference(list_next_rcu(list))) {
566 if (i-- == 0)
567 return list;
568 }
569
570 return NULL;
571}
572
573static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
574 struct list_head *head)
575{
576 struct list_head *list = v;
577
578 ++*pos;
579 list = rcu_dereference(list_next_rcu(list));
580
581 return (list == head) ? NULL : list;
582}
583
584static void smk_seq_stop(struct seq_file *s, void *v)
585{
586 rcu_read_unlock();
587}
588
589static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
590{
591 /*
592 * Don't show any rules with label names too long for
593 * interface file (/smack/load or /smack/load2)
594 * because you should expect to be able to write
595 * anything you read back.
596 */
597 if (strlen(srp->smk_subject->smk_known) >= max ||
598 strlen(srp->smk_object->smk_known) >= max)
599 return;
600
601 if (srp->smk_access == 0)
602 return;
603
604 seq_printf(s, "%s %s",
605 srp->smk_subject->smk_known,
606 srp->smk_object->smk_known);
607
608 seq_putc(s, ' ');
609
610 if (srp->smk_access & MAY_READ)
611 seq_putc(s, 'r');
612 if (srp->smk_access & MAY_WRITE)
613 seq_putc(s, 'w');
614 if (srp->smk_access & MAY_EXEC)
615 seq_putc(s, 'x');
616 if (srp->smk_access & MAY_APPEND)
617 seq_putc(s, 'a');
618 if (srp->smk_access & MAY_TRANSMUTE)
619 seq_putc(s, 't');
620 if (srp->smk_access & MAY_LOCK)
621 seq_putc(s, 'l');
622 if (srp->smk_access & MAY_BRINGUP)
623 seq_putc(s, 'b');
624
625 seq_putc(s, '\n');
626}
627
628/*
629 * Seq_file read operations for /smack/load
630 */
631
632static void *load2_seq_start(struct seq_file *s, loff_t *pos)
633{
634 return smk_seq_start(s, pos, &smack_rule_list);
635}
636
637static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
638{
639 return smk_seq_next(s, v, pos, &smack_rule_list);
640}
641
642static int load_seq_show(struct seq_file *s, void *v)
643{
644 struct list_head *list = v;
645 struct smack_master_list *smlp =
646 list_entry_rcu(list, struct smack_master_list, list);
647
648 smk_rule_show(s, smlp->smk_rule, SMK_LABELLEN);
649
650 return 0;
651}
652
653static const struct seq_operations load_seq_ops = {
654 .start = load2_seq_start,
655 .next = load2_seq_next,
656 .show = load_seq_show,
657 .stop = smk_seq_stop,
658};
659
660/**
661 * smk_open_load - open() for /smack/load
662 * @inode: inode structure representing file
663 * @file: "load" file pointer
664 *
665 * For reading, use load_seq_* seq_file reading operations.
666 */
667static int smk_open_load(struct inode *inode, struct file *file)
668{
669 return seq_open(file, &load_seq_ops);
670}
671
672/**
673 * smk_write_load - write() for /smack/load
674 * @file: file pointer, not actually used
675 * @buf: where to get the data from
676 * @count: bytes sent
677 * @ppos: where to start - must be 0
678 *
679 */
680static ssize_t smk_write_load(struct file *file, const char __user *buf,
681 size_t count, loff_t *ppos)
682{
683 /*
684 * Must have privilege.
685 * No partial writes.
686 * Enough data must be present.
687 */
688 if (!smack_privileged(CAP_MAC_ADMIN))
689 return -EPERM;
690
691 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
692 SMK_FIXED24_FMT);
693}
694
695static const struct file_operations smk_load_ops = {
696 .open = smk_open_load,
697 .read = seq_read,
698 .llseek = seq_lseek,
699 .write = smk_write_load,
700 .release = seq_release,
701};
702
703/**
704 * smk_cipso_doi - initialize the CIPSO domain
705 */
706static void smk_cipso_doi(void)
707{
708 int rc;
709 struct cipso_v4_doi *doip;
710 struct netlbl_audit nai;
711
712 smk_netlabel_audit_set(&nai);
713
714 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
715 if (rc != 0)
716 printk(KERN_WARNING "%s:%d remove rc = %d\n",
717 __func__, __LINE__, rc);
718
719 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL);
720 if (doip == NULL)
721 panic("smack: Failed to initialize cipso DOI.\n");
722 doip->map.std = NULL;
723 doip->doi = smk_cipso_doi_value;
724 doip->type = CIPSO_V4_MAP_PASS;
725 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
726 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
727 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
728
729 rc = netlbl_cfg_cipsov4_add(doip, &nai);
730 if (rc != 0) {
731 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
732 __func__, __LINE__, rc);
733 kfree(doip);
734 return;
735 }
736 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
737 if (rc != 0) {
738 printk(KERN_WARNING "%s:%d map add rc = %d\n",
739 __func__, __LINE__, rc);
740 kfree(doip);
741 return;
742 }
743}
744
745/**
746 * smk_unlbl_ambient - initialize the unlabeled domain
747 * @oldambient: previous domain string
748 */
749static void smk_unlbl_ambient(char *oldambient)
750{
751 int rc;
752 struct netlbl_audit nai;
753
754 smk_netlabel_audit_set(&nai);
755
756 if (oldambient != NULL) {
757 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
758 if (rc != 0)
759 printk(KERN_WARNING "%s:%d remove rc = %d\n",
760 __func__, __LINE__, rc);
761 }
762 if (smack_net_ambient == NULL)
763 smack_net_ambient = &smack_known_floor;
764
765 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
766 NULL, NULL, &nai);
767 if (rc != 0)
768 printk(KERN_WARNING "%s:%d add rc = %d\n",
769 __func__, __LINE__, rc);
770}
771
772/*
773 * Seq_file read operations for /smack/cipso
774 */
775
776static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
777{
778 return smk_seq_start(s, pos, &smack_known_list);
779}
780
781static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
782{
783 return smk_seq_next(s, v, pos, &smack_known_list);
784}
785
786/*
787 * Print cipso labels in format:
788 * label level[/cat[,cat]]
789 */
790static int cipso_seq_show(struct seq_file *s, void *v)
791{
792 struct list_head *list = v;
793 struct smack_known *skp =
794 list_entry_rcu(list, struct smack_known, list);
795 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
796 char sep = '/';
797 int i;
798
799 /*
800 * Don't show a label that could not have been set using
801 * /smack/cipso. This is in support of the notion that
802 * anything read from /smack/cipso ought to be writeable
803 * to /smack/cipso.
804 *
805 * /smack/cipso2 should be used instead.
806 */
807 if (strlen(skp->smk_known) >= SMK_LABELLEN)
808 return 0;
809
810 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
811
812 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
813 i = netlbl_catmap_walk(cmp, i + 1)) {
814 seq_printf(s, "%c%d", sep, i);
815 sep = ',';
816 }
817
818 seq_putc(s, '\n');
819
820 return 0;
821}
822
823static const struct seq_operations cipso_seq_ops = {
824 .start = cipso_seq_start,
825 .next = cipso_seq_next,
826 .show = cipso_seq_show,
827 .stop = smk_seq_stop,
828};
829
830/**
831 * smk_open_cipso - open() for /smack/cipso
832 * @inode: inode structure representing file
833 * @file: "cipso" file pointer
834 *
835 * Connect our cipso_seq_* operations with /smack/cipso
836 * file_operations
837 */
838static int smk_open_cipso(struct inode *inode, struct file *file)
839{
840 return seq_open(file, &cipso_seq_ops);
841}
842
843/**
844 * smk_set_cipso - do the work for write() for cipso and cipso2
845 * @file: file pointer, not actually used
846 * @buf: where to get the data from
847 * @count: bytes sent
848 * @ppos: where to start
849 * @format: /smack/cipso or /smack/cipso2
850 *
851 * Accepts only one cipso rule per write call.
852 * Returns number of bytes written or error code, as appropriate
853 */
854static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
855 size_t count, loff_t *ppos, int format)
856{
857 struct smack_known *skp;
858 struct netlbl_lsm_secattr ncats;
859 char mapcatset[SMK_CIPSOLEN];
860 int maplevel;
861 unsigned int cat;
862 int catlen;
863 ssize_t rc = -EINVAL;
864 char *data = NULL;
865 char *rule;
866 int ret;
867 int i;
868
869 /*
870 * Must have privilege.
871 * No partial writes.
872 * Enough data must be present.
873 */
874 if (!smack_privileged(CAP_MAC_ADMIN))
875 return -EPERM;
876 if (*ppos != 0)
877 return -EINVAL;
878 if (format == SMK_FIXED24_FMT &&
879 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
880 return -EINVAL;
881
882 data = memdup_user_nul(buf, count);
883 if (IS_ERR(data))
884 return PTR_ERR(data);
885
886 rule = data;
887 /*
888 * Only allow one writer at a time. Writes should be
889 * quite rare and small in any case.
890 */
891 mutex_lock(&smack_cipso_lock);
892
893 skp = smk_import_entry(rule, 0);
894 if (IS_ERR(skp)) {
895 rc = PTR_ERR(skp);
896 goto out;
897 }
898
899 if (format == SMK_FIXED24_FMT)
900 rule += SMK_LABELLEN;
901 else
902 rule += strlen(skp->smk_known) + 1;
903
904 ret = sscanf(rule, "%d", &maplevel);
905 if (ret != 1 || maplevel > SMACK_CIPSO_MAXLEVEL)
906 goto out;
907
908 rule += SMK_DIGITLEN;
909 ret = sscanf(rule, "%d", &catlen);
910 if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM)
911 goto out;
912
913 if (format == SMK_FIXED24_FMT &&
914 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
915 goto out;
916
917 memset(mapcatset, 0, sizeof(mapcatset));
918
919 for (i = 0; i < catlen; i++) {
920 rule += SMK_DIGITLEN;
921 ret = sscanf(rule, "%u", &cat);
922 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
923 goto out;
924
925 smack_catset_bit(cat, mapcatset);
926 }
927
928 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
929 if (rc >= 0) {
930 netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat);
931 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
932 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
933 rc = count;
934 }
935
936out:
937 mutex_unlock(&smack_cipso_lock);
938 kfree(data);
939 return rc;
940}
941
942/**
943 * smk_write_cipso - write() for /smack/cipso
944 * @file: file pointer, not actually used
945 * @buf: where to get the data from
946 * @count: bytes sent
947 * @ppos: where to start
948 *
949 * Accepts only one cipso rule per write call.
950 * Returns number of bytes written or error code, as appropriate
951 */
952static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
953 size_t count, loff_t *ppos)
954{
955 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
956}
957
958static const struct file_operations smk_cipso_ops = {
959 .open = smk_open_cipso,
960 .read = seq_read,
961 .llseek = seq_lseek,
962 .write = smk_write_cipso,
963 .release = seq_release,
964};
965
966/*
967 * Seq_file read operations for /smack/cipso2
968 */
969
970/*
971 * Print cipso labels in format:
972 * label level[/cat[,cat]]
973 */
974static int cipso2_seq_show(struct seq_file *s, void *v)
975{
976 struct list_head *list = v;
977 struct smack_known *skp =
978 list_entry_rcu(list, struct smack_known, list);
979 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
980 char sep = '/';
981 int i;
982
983 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
984
985 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
986 i = netlbl_catmap_walk(cmp, i + 1)) {
987 seq_printf(s, "%c%d", sep, i);
988 sep = ',';
989 }
990
991 seq_putc(s, '\n');
992
993 return 0;
994}
995
996static const struct seq_operations cipso2_seq_ops = {
997 .start = cipso_seq_start,
998 .next = cipso_seq_next,
999 .show = cipso2_seq_show,
1000 .stop = smk_seq_stop,
1001};
1002
1003/**
1004 * smk_open_cipso2 - open() for /smack/cipso2
1005 * @inode: inode structure representing file
1006 * @file: "cipso2" file pointer
1007 *
1008 * Connect our cipso_seq_* operations with /smack/cipso2
1009 * file_operations
1010 */
1011static int smk_open_cipso2(struct inode *inode, struct file *file)
1012{
1013 return seq_open(file, &cipso2_seq_ops);
1014}
1015
1016/**
1017 * smk_write_cipso2 - write() for /smack/cipso2
1018 * @file: file pointer, not actually used
1019 * @buf: where to get the data from
1020 * @count: bytes sent
1021 * @ppos: where to start
1022 *
1023 * Accepts only one cipso rule per write call.
1024 * Returns number of bytes written or error code, as appropriate
1025 */
1026static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1027 size_t count, loff_t *ppos)
1028{
1029 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1030}
1031
1032static const struct file_operations smk_cipso2_ops = {
1033 .open = smk_open_cipso2,
1034 .read = seq_read,
1035 .llseek = seq_lseek,
1036 .write = smk_write_cipso2,
1037 .release = seq_release,
1038};
1039
1040/*
1041 * Seq_file read operations for /smack/netlabel
1042 */
1043
1044static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1045{
1046 return smk_seq_start(s, pos, &smk_net4addr_list);
1047}
1048
1049static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1050{
1051 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1052}
1053
1054/*
1055 * Print host/label pairs
1056 */
1057static int net4addr_seq_show(struct seq_file *s, void *v)
1058{
1059 struct list_head *list = v;
1060 struct smk_net4addr *skp =
1061 list_entry_rcu(list, struct smk_net4addr, list);
1062 char *kp = SMACK_CIPSO_OPTION;
1063
1064 if (skp->smk_label != NULL)
1065 kp = skp->smk_label->smk_known;
1066 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1067 skp->smk_masks, kp);
1068
1069 return 0;
1070}
1071
1072static const struct seq_operations net4addr_seq_ops = {
1073 .start = net4addr_seq_start,
1074 .next = net4addr_seq_next,
1075 .show = net4addr_seq_show,
1076 .stop = smk_seq_stop,
1077};
1078
1079/**
1080 * smk_open_net4addr - open() for /smack/netlabel
1081 * @inode: inode structure representing file
1082 * @file: "netlabel" file pointer
1083 *
1084 * Connect our net4addr_seq_* operations with /smack/netlabel
1085 * file_operations
1086 */
1087static int smk_open_net4addr(struct inode *inode, struct file *file)
1088{
1089 return seq_open(file, &net4addr_seq_ops);
1090}
1091
1092/**
1093 * smk_net4addr_insert
1094 * @new : netlabel to insert
1095 *
1096 * This helper insert netlabel in the smack_net4addrs list
1097 * sorted by netmask length (longest to smallest)
1098 * locked by &smk_net4addr_lock in smk_write_net4addr
1099 *
1100 */
1101static void smk_net4addr_insert(struct smk_net4addr *new)
1102{
1103 struct smk_net4addr *m;
1104 struct smk_net4addr *m_next;
1105
1106 if (list_empty(&smk_net4addr_list)) {
1107 list_add_rcu(&new->list, &smk_net4addr_list);
1108 return;
1109 }
1110
1111 m = list_entry_rcu(smk_net4addr_list.next,
1112 struct smk_net4addr, list);
1113
1114 /* the comparison '>' is a bit hacky, but works */
1115 if (new->smk_masks > m->smk_masks) {
1116 list_add_rcu(&new->list, &smk_net4addr_list);
1117 return;
1118 }
1119
1120 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1121 if (list_is_last(&m->list, &smk_net4addr_list)) {
1122 list_add_rcu(&new->list, &m->list);
1123 return;
1124 }
1125 m_next = list_entry_rcu(m->list.next,
1126 struct smk_net4addr, list);
1127 if (new->smk_masks > m_next->smk_masks) {
1128 list_add_rcu(&new->list, &m->list);
1129 return;
1130 }
1131 }
1132}
1133
1134
1135/**
1136 * smk_write_net4addr - write() for /smack/netlabel
1137 * @file: file pointer, not actually used
1138 * @buf: where to get the data from
1139 * @count: bytes sent
1140 * @ppos: where to start
1141 *
1142 * Accepts only one net4addr per write call.
1143 * Returns number of bytes written or error code, as appropriate
1144 */
1145static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1146 size_t count, loff_t *ppos)
1147{
1148 struct smk_net4addr *snp;
1149 struct sockaddr_in newname;
1150 char *smack;
1151 struct smack_known *skp = NULL;
1152 char *data;
1153 char *host = (char *)&newname.sin_addr.s_addr;
1154 int rc;
1155 struct netlbl_audit audit_info;
1156 struct in_addr mask;
1157 unsigned int m;
1158 unsigned int masks;
1159 int found;
1160 u32 mask_bits = (1<<31);
1161 __be32 nsa;
1162 u32 temp_mask;
1163
1164 /*
1165 * Must have privilege.
1166 * No partial writes.
1167 * Enough data must be present.
1168 * "<addr/mask, as a.b.c.d/e><space><label>"
1169 * "<addr, as a.b.c.d><space><label>"
1170 */
1171 if (!smack_privileged(CAP_MAC_ADMIN))
1172 return -EPERM;
1173 if (*ppos != 0)
1174 return -EINVAL;
1175 if (count < SMK_NETLBLADDRMIN)
1176 return -EINVAL;
1177
1178 data = memdup_user_nul(buf, count);
1179 if (IS_ERR(data))
1180 return PTR_ERR(data);
1181
1182 smack = kzalloc(count + 1, GFP_KERNEL);
1183 if (smack == NULL) {
1184 rc = -ENOMEM;
1185 goto free_data_out;
1186 }
1187
1188 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1189 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1190 if (rc != 6) {
1191 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1192 &host[0], &host[1], &host[2], &host[3], smack);
1193 if (rc != 5) {
1194 rc = -EINVAL;
1195 goto free_out;
1196 }
1197 m = BEBITS;
1198 masks = 32;
1199 }
1200 if (masks > BEBITS) {
1201 rc = -EINVAL;
1202 goto free_out;
1203 }
1204
1205 /*
1206 * If smack begins with '-', it is an option, don't import it
1207 */
1208 if (smack[0] != '-') {
1209 skp = smk_import_entry(smack, 0);
1210 if (IS_ERR(skp)) {
1211 rc = PTR_ERR(skp);
1212 goto free_out;
1213 }
1214 } else {
1215 /*
1216 * Only the -CIPSO option is supported for IPv4
1217 */
1218 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1219 rc = -EINVAL;
1220 goto free_out;
1221 }
1222 }
1223
1224 for (m = masks, temp_mask = 0; m > 0; m--) {
1225 temp_mask |= mask_bits;
1226 mask_bits >>= 1;
1227 }
1228 mask.s_addr = cpu_to_be32(temp_mask);
1229
1230 newname.sin_addr.s_addr &= mask.s_addr;
1231 /*
1232 * Only allow one writer at a time. Writes should be
1233 * quite rare and small in any case.
1234 */
1235 mutex_lock(&smk_net4addr_lock);
1236
1237 nsa = newname.sin_addr.s_addr;
1238 /* try to find if the prefix is already in the list */
1239 found = 0;
1240 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1241 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1242 found = 1;
1243 break;
1244 }
1245 }
1246 smk_netlabel_audit_set(&audit_info);
1247
1248 if (found == 0) {
1249 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1250 if (snp == NULL)
1251 rc = -ENOMEM;
1252 else {
1253 rc = 0;
1254 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1255 snp->smk_mask.s_addr = mask.s_addr;
1256 snp->smk_label = skp;
1257 snp->smk_masks = masks;
1258 smk_net4addr_insert(snp);
1259 }
1260 } else {
1261 /*
1262 * Delete the unlabeled entry, only if the previous label
1263 * wasn't the special CIPSO option
1264 */
1265 if (snp->smk_label != NULL)
1266 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1267 &snp->smk_host, &snp->smk_mask,
1268 PF_INET, &audit_info);
1269 else
1270 rc = 0;
1271 snp->smk_label = skp;
1272 }
1273
1274 /*
1275 * Now tell netlabel about the single label nature of
1276 * this host so that incoming packets get labeled.
1277 * but only if we didn't get the special CIPSO option
1278 */
1279 if (rc == 0 && skp != NULL)
1280 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1281 &snp->smk_host, &snp->smk_mask, PF_INET,
1282 snp->smk_label->smk_secid, &audit_info);
1283
1284 if (rc == 0)
1285 rc = count;
1286
1287 mutex_unlock(&smk_net4addr_lock);
1288
1289free_out:
1290 kfree(smack);
1291free_data_out:
1292 kfree(data);
1293
1294 return rc;
1295}
1296
1297static const struct file_operations smk_net4addr_ops = {
1298 .open = smk_open_net4addr,
1299 .read = seq_read,
1300 .llseek = seq_lseek,
1301 .write = smk_write_net4addr,
1302 .release = seq_release,
1303};
1304
1305#if IS_ENABLED(CONFIG_IPV6)
1306/*
1307 * Seq_file read operations for /smack/netlabel6
1308 */
1309
1310static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1311{
1312 return smk_seq_start(s, pos, &smk_net6addr_list);
1313}
1314
1315static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1316{
1317 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1318}
1319
1320/*
1321 * Print host/label pairs
1322 */
1323static int net6addr_seq_show(struct seq_file *s, void *v)
1324{
1325 struct list_head *list = v;
1326 struct smk_net6addr *skp =
1327 list_entry(list, struct smk_net6addr, list);
1328
1329 if (skp->smk_label != NULL)
1330 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1331 skp->smk_label->smk_known);
1332
1333 return 0;
1334}
1335
1336static const struct seq_operations net6addr_seq_ops = {
1337 .start = net6addr_seq_start,
1338 .next = net6addr_seq_next,
1339 .show = net6addr_seq_show,
1340 .stop = smk_seq_stop,
1341};
1342
1343/**
1344 * smk_open_net6addr - open() for /smack/netlabel
1345 * @inode: inode structure representing file
1346 * @file: "netlabel" file pointer
1347 *
1348 * Connect our net6addr_seq_* operations with /smack/netlabel
1349 * file_operations
1350 */
1351static int smk_open_net6addr(struct inode *inode, struct file *file)
1352{
1353 return seq_open(file, &net6addr_seq_ops);
1354}
1355
1356/**
1357 * smk_net6addr_insert
1358 * @new : entry to insert
1359 *
1360 * This inserts an entry in the smack_net6addrs list
1361 * sorted by netmask length (longest to smallest)
1362 * locked by &smk_net6addr_lock in smk_write_net6addr
1363 *
1364 */
1365static void smk_net6addr_insert(struct smk_net6addr *new)
1366{
1367 struct smk_net6addr *m_next;
1368 struct smk_net6addr *m;
1369
1370 if (list_empty(&smk_net6addr_list)) {
1371 list_add_rcu(&new->list, &smk_net6addr_list);
1372 return;
1373 }
1374
1375 m = list_entry_rcu(smk_net6addr_list.next,
1376 struct smk_net6addr, list);
1377
1378 if (new->smk_masks > m->smk_masks) {
1379 list_add_rcu(&new->list, &smk_net6addr_list);
1380 return;
1381 }
1382
1383 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1384 if (list_is_last(&m->list, &smk_net6addr_list)) {
1385 list_add_rcu(&new->list, &m->list);
1386 return;
1387 }
1388 m_next = list_entry_rcu(m->list.next,
1389 struct smk_net6addr, list);
1390 if (new->smk_masks > m_next->smk_masks) {
1391 list_add_rcu(&new->list, &m->list);
1392 return;
1393 }
1394 }
1395}
1396
1397
1398/**
1399 * smk_write_net6addr - write() for /smack/netlabel
1400 * @file: file pointer, not actually used
1401 * @buf: where to get the data from
1402 * @count: bytes sent
1403 * @ppos: where to start
1404 *
1405 * Accepts only one net6addr per write call.
1406 * Returns number of bytes written or error code, as appropriate
1407 */
1408static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1409 size_t count, loff_t *ppos)
1410{
1411 struct smk_net6addr *snp;
1412 struct in6_addr newname;
1413 struct in6_addr fullmask;
1414 struct smack_known *skp = NULL;
1415 char *smack;
1416 char *data;
1417 int rc = 0;
1418 int found = 0;
1419 int i;
1420 unsigned int scanned[8];
1421 unsigned int m;
1422 unsigned int mask = 128;
1423
1424 /*
1425 * Must have privilege.
1426 * No partial writes.
1427 * Enough data must be present.
1428 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1429 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1430 */
1431 if (!smack_privileged(CAP_MAC_ADMIN))
1432 return -EPERM;
1433 if (*ppos != 0)
1434 return -EINVAL;
1435 if (count < SMK_NETLBLADDRMIN)
1436 return -EINVAL;
1437
1438 data = memdup_user_nul(buf, count);
1439 if (IS_ERR(data))
1440 return PTR_ERR(data);
1441
1442 smack = kzalloc(count + 1, GFP_KERNEL);
1443 if (smack == NULL) {
1444 rc = -ENOMEM;
1445 goto free_data_out;
1446 }
1447
1448 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1449 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1450 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1451 &mask, smack);
1452 if (i != 10) {
1453 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1454 &scanned[0], &scanned[1], &scanned[2],
1455 &scanned[3], &scanned[4], &scanned[5],
1456 &scanned[6], &scanned[7], smack);
1457 if (i != 9) {
1458 rc = -EINVAL;
1459 goto free_out;
1460 }
1461 }
1462 if (mask > 128) {
1463 rc = -EINVAL;
1464 goto free_out;
1465 }
1466 for (i = 0; i < 8; i++) {
1467 if (scanned[i] > 0xffff) {
1468 rc = -EINVAL;
1469 goto free_out;
1470 }
1471 newname.s6_addr16[i] = htons(scanned[i]);
1472 }
1473
1474 /*
1475 * If smack begins with '-', it is an option, don't import it
1476 */
1477 if (smack[0] != '-') {
1478 skp = smk_import_entry(smack, 0);
1479 if (IS_ERR(skp)) {
1480 rc = PTR_ERR(skp);
1481 goto free_out;
1482 }
1483 } else {
1484 /*
1485 * Only -DELETE is supported for IPv6
1486 */
1487 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1488 rc = -EINVAL;
1489 goto free_out;
1490 }
1491 }
1492
1493 for (i = 0, m = mask; i < 8; i++) {
1494 if (m >= 16) {
1495 fullmask.s6_addr16[i] = 0xffff;
1496 m -= 16;
1497 } else if (m > 0) {
1498 fullmask.s6_addr16[i] = (1 << m) - 1;
1499 m = 0;
1500 } else
1501 fullmask.s6_addr16[i] = 0;
1502 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1503 }
1504
1505 /*
1506 * Only allow one writer at a time. Writes should be
1507 * quite rare and small in any case.
1508 */
1509 mutex_lock(&smk_net6addr_lock);
1510 /*
1511 * Try to find the prefix in the list
1512 */
1513 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1514 if (mask != snp->smk_masks)
1515 continue;
1516 for (found = 1, i = 0; i < 8; i++) {
1517 if (newname.s6_addr16[i] !=
1518 snp->smk_host.s6_addr16[i]) {
1519 found = 0;
1520 break;
1521 }
1522 }
1523 if (found == 1)
1524 break;
1525 }
1526 if (found == 0) {
1527 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1528 if (snp == NULL)
1529 rc = -ENOMEM;
1530 else {
1531 snp->smk_host = newname;
1532 snp->smk_mask = fullmask;
1533 snp->smk_masks = mask;
1534 snp->smk_label = skp;
1535 smk_net6addr_insert(snp);
1536 }
1537 } else {
1538 snp->smk_label = skp;
1539 }
1540
1541 if (rc == 0)
1542 rc = count;
1543
1544 mutex_unlock(&smk_net6addr_lock);
1545
1546free_out:
1547 kfree(smack);
1548free_data_out:
1549 kfree(data);
1550
1551 return rc;
1552}
1553
1554static const struct file_operations smk_net6addr_ops = {
1555 .open = smk_open_net6addr,
1556 .read = seq_read,
1557 .llseek = seq_lseek,
1558 .write = smk_write_net6addr,
1559 .release = seq_release,
1560};
1561#endif /* CONFIG_IPV6 */
1562
1563/**
1564 * smk_read_doi - read() for /smack/doi
1565 * @filp: file pointer, not actually used
1566 * @buf: where to put the result
1567 * @count: maximum to send along
1568 * @ppos: where to start
1569 *
1570 * Returns number of bytes read or error code, as appropriate
1571 */
1572static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1573 size_t count, loff_t *ppos)
1574{
1575 char temp[80];
1576 ssize_t rc;
1577
1578 if (*ppos != 0)
1579 return 0;
1580
1581 sprintf(temp, "%d", smk_cipso_doi_value);
1582 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1583
1584 return rc;
1585}
1586
1587/**
1588 * smk_write_doi - write() for /smack/doi
1589 * @file: file pointer, not actually used
1590 * @buf: where to get the data from
1591 * @count: bytes sent
1592 * @ppos: where to start
1593 *
1594 * Returns number of bytes written or error code, as appropriate
1595 */
1596static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1597 size_t count, loff_t *ppos)
1598{
1599 char temp[80];
1600 int i;
1601
1602 if (!smack_privileged(CAP_MAC_ADMIN))
1603 return -EPERM;
1604
1605 if (count >= sizeof(temp) || count == 0)
1606 return -EINVAL;
1607
1608 if (copy_from_user(temp, buf, count) != 0)
1609 return -EFAULT;
1610
1611 temp[count] = '\0';
1612
1613 if (sscanf(temp, "%d", &i) != 1)
1614 return -EINVAL;
1615
1616 smk_cipso_doi_value = i;
1617
1618 smk_cipso_doi();
1619
1620 return count;
1621}
1622
1623static const struct file_operations smk_doi_ops = {
1624 .read = smk_read_doi,
1625 .write = smk_write_doi,
1626 .llseek = default_llseek,
1627};
1628
1629/**
1630 * smk_read_direct - read() for /smack/direct
1631 * @filp: file pointer, not actually used
1632 * @buf: where to put the result
1633 * @count: maximum to send along
1634 * @ppos: where to start
1635 *
1636 * Returns number of bytes read or error code, as appropriate
1637 */
1638static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1639 size_t count, loff_t *ppos)
1640{
1641 char temp[80];
1642 ssize_t rc;
1643
1644 if (*ppos != 0)
1645 return 0;
1646
1647 sprintf(temp, "%d", smack_cipso_direct);
1648 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1649
1650 return rc;
1651}
1652
1653/**
1654 * smk_write_direct - write() for /smack/direct
1655 * @file: file pointer, not actually used
1656 * @buf: where to get the data from
1657 * @count: bytes sent
1658 * @ppos: where to start
1659 *
1660 * Returns number of bytes written or error code, as appropriate
1661 */
1662static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1663 size_t count, loff_t *ppos)
1664{
1665 struct smack_known *skp;
1666 char temp[80];
1667 int i;
1668
1669 if (!smack_privileged(CAP_MAC_ADMIN))
1670 return -EPERM;
1671
1672 if (count >= sizeof(temp) || count == 0)
1673 return -EINVAL;
1674
1675 if (copy_from_user(temp, buf, count) != 0)
1676 return -EFAULT;
1677
1678 temp[count] = '\0';
1679
1680 if (sscanf(temp, "%d", &i) != 1)
1681 return -EINVAL;
1682
1683 /*
1684 * Don't do anything if the value hasn't actually changed.
1685 * If it is changing reset the level on entries that were
1686 * set up to be direct when they were created.
1687 */
1688 if (smack_cipso_direct != i) {
1689 mutex_lock(&smack_known_lock);
1690 list_for_each_entry_rcu(skp, &smack_known_list, list)
1691 if (skp->smk_netlabel.attr.mls.lvl ==
1692 smack_cipso_direct)
1693 skp->smk_netlabel.attr.mls.lvl = i;
1694 smack_cipso_direct = i;
1695 mutex_unlock(&smack_known_lock);
1696 }
1697
1698 return count;
1699}
1700
1701static const struct file_operations smk_direct_ops = {
1702 .read = smk_read_direct,
1703 .write = smk_write_direct,
1704 .llseek = default_llseek,
1705};
1706
1707/**
1708 * smk_read_mapped - read() for /smack/mapped
1709 * @filp: file pointer, not actually used
1710 * @buf: where to put the result
1711 * @count: maximum to send along
1712 * @ppos: where to start
1713 *
1714 * Returns number of bytes read or error code, as appropriate
1715 */
1716static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1717 size_t count, loff_t *ppos)
1718{
1719 char temp[80];
1720 ssize_t rc;
1721
1722 if (*ppos != 0)
1723 return 0;
1724
1725 sprintf(temp, "%d", smack_cipso_mapped);
1726 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1727
1728 return rc;
1729}
1730
1731/**
1732 * smk_write_mapped - write() for /smack/mapped
1733 * @file: file pointer, not actually used
1734 * @buf: where to get the data from
1735 * @count: bytes sent
1736 * @ppos: where to start
1737 *
1738 * Returns number of bytes written or error code, as appropriate
1739 */
1740static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1741 size_t count, loff_t *ppos)
1742{
1743 struct smack_known *skp;
1744 char temp[80];
1745 int i;
1746
1747 if (!smack_privileged(CAP_MAC_ADMIN))
1748 return -EPERM;
1749
1750 if (count >= sizeof(temp) || count == 0)
1751 return -EINVAL;
1752
1753 if (copy_from_user(temp, buf, count) != 0)
1754 return -EFAULT;
1755
1756 temp[count] = '\0';
1757
1758 if (sscanf(temp, "%d", &i) != 1)
1759 return -EINVAL;
1760
1761 /*
1762 * Don't do anything if the value hasn't actually changed.
1763 * If it is changing reset the level on entries that were
1764 * set up to be mapped when they were created.
1765 */
1766 if (smack_cipso_mapped != i) {
1767 mutex_lock(&smack_known_lock);
1768 list_for_each_entry_rcu(skp, &smack_known_list, list)
1769 if (skp->smk_netlabel.attr.mls.lvl ==
1770 smack_cipso_mapped)
1771 skp->smk_netlabel.attr.mls.lvl = i;
1772 smack_cipso_mapped = i;
1773 mutex_unlock(&smack_known_lock);
1774 }
1775
1776 return count;
1777}
1778
1779static const struct file_operations smk_mapped_ops = {
1780 .read = smk_read_mapped,
1781 .write = smk_write_mapped,
1782 .llseek = default_llseek,
1783};
1784
1785/**
1786 * smk_read_ambient - read() for /smack/ambient
1787 * @filp: file pointer, not actually used
1788 * @buf: where to put the result
1789 * @cn: maximum to send along
1790 * @ppos: where to start
1791 *
1792 * Returns number of bytes read or error code, as appropriate
1793 */
1794static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1795 size_t cn, loff_t *ppos)
1796{
1797 ssize_t rc;
1798 int asize;
1799
1800 if (*ppos != 0)
1801 return 0;
1802 /*
1803 * Being careful to avoid a problem in the case where
1804 * smack_net_ambient gets changed in midstream.
1805 */
1806 mutex_lock(&smack_ambient_lock);
1807
1808 asize = strlen(smack_net_ambient->smk_known) + 1;
1809
1810 if (cn >= asize)
1811 rc = simple_read_from_buffer(buf, cn, ppos,
1812 smack_net_ambient->smk_known,
1813 asize);
1814 else
1815 rc = -EINVAL;
1816
1817 mutex_unlock(&smack_ambient_lock);
1818
1819 return rc;
1820}
1821
1822/**
1823 * smk_write_ambient - write() for /smack/ambient
1824 * @file: file pointer, not actually used
1825 * @buf: where to get the data from
1826 * @count: bytes sent
1827 * @ppos: where to start
1828 *
1829 * Returns number of bytes written or error code, as appropriate
1830 */
1831static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1832 size_t count, loff_t *ppos)
1833{
1834 struct smack_known *skp;
1835 char *oldambient;
1836 char *data;
1837 int rc = count;
1838
1839 if (!smack_privileged(CAP_MAC_ADMIN))
1840 return -EPERM;
1841
1842 data = memdup_user_nul(buf, count);
1843 if (IS_ERR(data))
1844 return PTR_ERR(data);
1845
1846 skp = smk_import_entry(data, count);
1847 if (IS_ERR(skp)) {
1848 rc = PTR_ERR(skp);
1849 goto out;
1850 }
1851
1852 mutex_lock(&smack_ambient_lock);
1853
1854 oldambient = smack_net_ambient->smk_known;
1855 smack_net_ambient = skp;
1856 smk_unlbl_ambient(oldambient);
1857
1858 mutex_unlock(&smack_ambient_lock);
1859
1860out:
1861 kfree(data);
1862 return rc;
1863}
1864
1865static const struct file_operations smk_ambient_ops = {
1866 .read = smk_read_ambient,
1867 .write = smk_write_ambient,
1868 .llseek = default_llseek,
1869};
1870
1871/*
1872 * Seq_file operations for /smack/onlycap
1873 */
1874static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1875{
1876 return smk_seq_start(s, pos, &smack_onlycap_list);
1877}
1878
1879static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1880{
1881 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1882}
1883
1884static int onlycap_seq_show(struct seq_file *s, void *v)
1885{
1886 struct list_head *list = v;
1887 struct smack_known_list_elem *sklep =
1888 list_entry_rcu(list, struct smack_known_list_elem, list);
1889
1890 seq_puts(s, sklep->smk_label->smk_known);
1891 seq_putc(s, ' ');
1892
1893 return 0;
1894}
1895
1896static const struct seq_operations onlycap_seq_ops = {
1897 .start = onlycap_seq_start,
1898 .next = onlycap_seq_next,
1899 .show = onlycap_seq_show,
1900 .stop = smk_seq_stop,
1901};
1902
1903static int smk_open_onlycap(struct inode *inode, struct file *file)
1904{
1905 return seq_open(file, &onlycap_seq_ops);
1906}
1907
1908/**
1909 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1910 * The caller must hold appropriate mutex to prevent concurrent modifications
1911 * to the public list.
1912 * Private list is assumed to be not accessible to other threads yet.
1913 *
1914 * @public: public list
1915 * @private: private list
1916 */
1917static void smk_list_swap_rcu(struct list_head *public,
1918 struct list_head *private)
1919{
1920 struct list_head *first, *last;
1921
1922 if (list_empty(public)) {
1923 list_splice_init_rcu(private, public, synchronize_rcu);
1924 } else {
1925 /* Remember public list before replacing it */
1926 first = public->next;
1927 last = public->prev;
1928
1929 /* Publish private list in place of public in RCU-safe way */
1930 private->prev->next = public;
1931 private->next->prev = public;
1932 rcu_assign_pointer(public->next, private->next);
1933 public->prev = private->prev;
1934
1935 synchronize_rcu();
1936
1937 /* When all readers are done with the old public list,
1938 * attach it in place of private */
1939 private->next = first;
1940 private->prev = last;
1941 first->prev = private;
1942 last->next = private;
1943 }
1944}
1945
1946/**
1947 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1948 *
1949 * @data: the string to parse
1950 * @private: destination list
1951 *
1952 * Returns zero on success or error code, as appropriate
1953 */
1954static int smk_parse_label_list(char *data, struct list_head *list)
1955{
1956 char *tok;
1957 struct smack_known *skp;
1958 struct smack_known_list_elem *sklep;
1959
1960 while ((tok = strsep(&data, " ")) != NULL) {
1961 if (!*tok)
1962 continue;
1963
1964 skp = smk_import_entry(tok, 0);
1965 if (IS_ERR(skp))
1966 return PTR_ERR(skp);
1967
1968 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1969 if (sklep == NULL)
1970 return -ENOMEM;
1971
1972 sklep->smk_label = skp;
1973 list_add(&sklep->list, list);
1974 }
1975
1976 return 0;
1977}
1978
1979/**
1980 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1981 * @head: header pointer of the list to destroy
1982 */
1983void smk_destroy_label_list(struct list_head *list)
1984{
1985 struct smack_known_list_elem *sklep;
1986 struct smack_known_list_elem *sklep2;
1987
1988 list_for_each_entry_safe(sklep, sklep2, list, list)
1989 kfree(sklep);
1990
1991 INIT_LIST_HEAD(list);
1992}
1993
1994/**
1995 * smk_write_onlycap - write() for smackfs/onlycap
1996 * @file: file pointer, not actually used
1997 * @buf: where to get the data from
1998 * @count: bytes sent
1999 * @ppos: where to start
2000 *
2001 * Returns number of bytes written or error code, as appropriate
2002 */
2003static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2004 size_t count, loff_t *ppos)
2005{
2006 char *data;
2007 LIST_HEAD(list_tmp);
2008 int rc;
2009
2010 if (!smack_privileged(CAP_MAC_ADMIN))
2011 return -EPERM;
2012
2013 data = memdup_user_nul(buf, count);
2014 if (IS_ERR(data))
2015 return PTR_ERR(data);
2016
2017 rc = smk_parse_label_list(data, &list_tmp);
2018 kfree(data);
2019
2020 /*
2021 * Clear the smack_onlycap on invalid label errors. This means
2022 * that we can pass a null string to unset the onlycap value.
2023 *
2024 * Importing will also reject a label beginning with '-',
2025 * so "-usecapabilities" will also work.
2026 *
2027 * But do so only on invalid label, not on system errors.
2028 * The invalid label must be first to count as clearing attempt.
2029 */
2030 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2031 mutex_lock(&smack_onlycap_lock);
2032 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2033 mutex_unlock(&smack_onlycap_lock);
2034 rc = count;
2035 }
2036
2037 smk_destroy_label_list(&list_tmp);
2038
2039 return rc;
2040}
2041
2042static const struct file_operations smk_onlycap_ops = {
2043 .open = smk_open_onlycap,
2044 .read = seq_read,
2045 .write = smk_write_onlycap,
2046 .llseek = seq_lseek,
2047 .release = seq_release,
2048};
2049
2050#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2051/**
2052 * smk_read_unconfined - read() for smackfs/unconfined
2053 * @filp: file pointer, not actually used
2054 * @buf: where to put the result
2055 * @cn: maximum to send along
2056 * @ppos: where to start
2057 *
2058 * Returns number of bytes read or error code, as appropriate
2059 */
2060static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2061 size_t cn, loff_t *ppos)
2062{
2063 char *smack = "";
2064 ssize_t rc = -EINVAL;
2065 int asize;
2066
2067 if (*ppos != 0)
2068 return 0;
2069
2070 if (smack_unconfined != NULL)
2071 smack = smack_unconfined->smk_known;
2072
2073 asize = strlen(smack) + 1;
2074
2075 if (cn >= asize)
2076 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2077
2078 return rc;
2079}
2080
2081/**
2082 * smk_write_unconfined - write() for smackfs/unconfined
2083 * @file: file pointer, not actually used
2084 * @buf: where to get the data from
2085 * @count: bytes sent
2086 * @ppos: where to start
2087 *
2088 * Returns number of bytes written or error code, as appropriate
2089 */
2090static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2091 size_t count, loff_t *ppos)
2092{
2093 char *data;
2094 struct smack_known *skp;
2095 int rc = count;
2096
2097 if (!smack_privileged(CAP_MAC_ADMIN))
2098 return -EPERM;
2099
2100 data = memdup_user_nul(buf, count);
2101 if (IS_ERR(data))
2102 return PTR_ERR(data);
2103
2104 /*
2105 * Clear the smack_unconfined on invalid label errors. This means
2106 * that we can pass a null string to unset the unconfined value.
2107 *
2108 * Importing will also reject a label beginning with '-',
2109 * so "-confine" will also work.
2110 *
2111 * But do so only on invalid label, not on system errors.
2112 */
2113 skp = smk_import_entry(data, count);
2114 if (PTR_ERR(skp) == -EINVAL)
2115 skp = NULL;
2116 else if (IS_ERR(skp)) {
2117 rc = PTR_ERR(skp);
2118 goto freeout;
2119 }
2120
2121 smack_unconfined = skp;
2122
2123freeout:
2124 kfree(data);
2125 return rc;
2126}
2127
2128static const struct file_operations smk_unconfined_ops = {
2129 .read = smk_read_unconfined,
2130 .write = smk_write_unconfined,
2131 .llseek = default_llseek,
2132};
2133#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2134
2135/**
2136 * smk_read_logging - read() for /smack/logging
2137 * @filp: file pointer, not actually used
2138 * @buf: where to put the result
2139 * @cn: maximum to send along
2140 * @ppos: where to start
2141 *
2142 * Returns number of bytes read or error code, as appropriate
2143 */
2144static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2145 size_t count, loff_t *ppos)
2146{
2147 char temp[32];
2148 ssize_t rc;
2149
2150 if (*ppos != 0)
2151 return 0;
2152
2153 sprintf(temp, "%d\n", log_policy);
2154 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2155 return rc;
2156}
2157
2158/**
2159 * smk_write_logging - write() for /smack/logging
2160 * @file: file pointer, not actually used
2161 * @buf: where to get the data from
2162 * @count: bytes sent
2163 * @ppos: where to start
2164 *
2165 * Returns number of bytes written or error code, as appropriate
2166 */
2167static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2168 size_t count, loff_t *ppos)
2169{
2170 char temp[32];
2171 int i;
2172
2173 if (!smack_privileged(CAP_MAC_ADMIN))
2174 return -EPERM;
2175
2176 if (count >= sizeof(temp) || count == 0)
2177 return -EINVAL;
2178
2179 if (copy_from_user(temp, buf, count) != 0)
2180 return -EFAULT;
2181
2182 temp[count] = '\0';
2183
2184 if (sscanf(temp, "%d", &i) != 1)
2185 return -EINVAL;
2186 if (i < 0 || i > 3)
2187 return -EINVAL;
2188 log_policy = i;
2189 return count;
2190}
2191
2192
2193
2194static const struct file_operations smk_logging_ops = {
2195 .read = smk_read_logging,
2196 .write = smk_write_logging,
2197 .llseek = default_llseek,
2198};
2199
2200/*
2201 * Seq_file read operations for /smack/load-self
2202 */
2203
2204static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2205{
2206 struct task_smack *tsp = current_security();
2207
2208 return smk_seq_start(s, pos, &tsp->smk_rules);
2209}
2210
2211static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2212{
2213 struct task_smack *tsp = current_security();
2214
2215 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2216}
2217
2218static int load_self_seq_show(struct seq_file *s, void *v)
2219{
2220 struct list_head *list = v;
2221 struct smack_rule *srp =
2222 list_entry_rcu(list, struct smack_rule, list);
2223
2224 smk_rule_show(s, srp, SMK_LABELLEN);
2225
2226 return 0;
2227}
2228
2229static const struct seq_operations load_self_seq_ops = {
2230 .start = load_self_seq_start,
2231 .next = load_self_seq_next,
2232 .show = load_self_seq_show,
2233 .stop = smk_seq_stop,
2234};
2235
2236
2237/**
2238 * smk_open_load_self - open() for /smack/load-self2
2239 * @inode: inode structure representing file
2240 * @file: "load" file pointer
2241 *
2242 * For reading, use load_seq_* seq_file reading operations.
2243 */
2244static int smk_open_load_self(struct inode *inode, struct file *file)
2245{
2246 return seq_open(file, &load_self_seq_ops);
2247}
2248
2249/**
2250 * smk_write_load_self - write() for /smack/load-self
2251 * @file: file pointer, not actually used
2252 * @buf: where to get the data from
2253 * @count: bytes sent
2254 * @ppos: where to start - must be 0
2255 *
2256 */
2257static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2258 size_t count, loff_t *ppos)
2259{
2260 struct task_smack *tsp = current_security();
2261
2262 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2263 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2264}
2265
2266static const struct file_operations smk_load_self_ops = {
2267 .open = smk_open_load_self,
2268 .read = seq_read,
2269 .llseek = seq_lseek,
2270 .write = smk_write_load_self,
2271 .release = seq_release,
2272};
2273
2274/**
2275 * smk_user_access - handle access check transaction
2276 * @file: file pointer
2277 * @buf: data from user space
2278 * @count: bytes sent
2279 * @ppos: where to start - must be 0
2280 */
2281static ssize_t smk_user_access(struct file *file, const char __user *buf,
2282 size_t count, loff_t *ppos, int format)
2283{
2284 struct smack_parsed_rule rule;
2285 char *data;
2286 int res;
2287
2288 data = simple_transaction_get(file, buf, count);
2289 if (IS_ERR(data))
2290 return PTR_ERR(data);
2291
2292 if (format == SMK_FIXED24_FMT) {
2293 if (count < SMK_LOADLEN)
2294 return -EINVAL;
2295 res = smk_parse_rule(data, &rule, 0);
2296 } else {
2297 /*
2298 * simple_transaction_get() returns null-terminated data
2299 */
2300 res = smk_parse_long_rule(data, &rule, 0, 3);
2301 }
2302
2303 if (res >= 0)
2304 res = smk_access(rule.smk_subject, rule.smk_object,
2305 rule.smk_access1, NULL);
2306 else if (res != -ENOENT)
2307 return res;
2308
2309 /*
2310 * smk_access() can return a value > 0 in the "bringup" case.
2311 */
2312 data[0] = res >= 0 ? '1' : '0';
2313 data[1] = '\0';
2314
2315 simple_transaction_set(file, 2);
2316
2317 if (format == SMK_FIXED24_FMT)
2318 return SMK_LOADLEN;
2319 return count;
2320}
2321
2322/**
2323 * smk_write_access - handle access check transaction
2324 * @file: file pointer
2325 * @buf: data from user space
2326 * @count: bytes sent
2327 * @ppos: where to start - must be 0
2328 */
2329static ssize_t smk_write_access(struct file *file, const char __user *buf,
2330 size_t count, loff_t *ppos)
2331{
2332 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2333}
2334
2335static const struct file_operations smk_access_ops = {
2336 .write = smk_write_access,
2337 .read = simple_transaction_read,
2338 .release = simple_transaction_release,
2339 .llseek = generic_file_llseek,
2340};
2341
2342
2343/*
2344 * Seq_file read operations for /smack/load2
2345 */
2346
2347static int load2_seq_show(struct seq_file *s, void *v)
2348{
2349 struct list_head *list = v;
2350 struct smack_master_list *smlp =
2351 list_entry_rcu(list, struct smack_master_list, list);
2352
2353 smk_rule_show(s, smlp->smk_rule, SMK_LONGLABEL);
2354
2355 return 0;
2356}
2357
2358static const struct seq_operations load2_seq_ops = {
2359 .start = load2_seq_start,
2360 .next = load2_seq_next,
2361 .show = load2_seq_show,
2362 .stop = smk_seq_stop,
2363};
2364
2365/**
2366 * smk_open_load2 - open() for /smack/load2
2367 * @inode: inode structure representing file
2368 * @file: "load2" file pointer
2369 *
2370 * For reading, use load2_seq_* seq_file reading operations.
2371 */
2372static int smk_open_load2(struct inode *inode, struct file *file)
2373{
2374 return seq_open(file, &load2_seq_ops);
2375}
2376
2377/**
2378 * smk_write_load2 - write() for /smack/load2
2379 * @file: file pointer, not actually used
2380 * @buf: where to get the data from
2381 * @count: bytes sent
2382 * @ppos: where to start - must be 0
2383 *
2384 */
2385static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2386 size_t count, loff_t *ppos)
2387{
2388 /*
2389 * Must have privilege.
2390 */
2391 if (!smack_privileged(CAP_MAC_ADMIN))
2392 return -EPERM;
2393
2394 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2395 SMK_LONG_FMT);
2396}
2397
2398static const struct file_operations smk_load2_ops = {
2399 .open = smk_open_load2,
2400 .read = seq_read,
2401 .llseek = seq_lseek,
2402 .write = smk_write_load2,
2403 .release = seq_release,
2404};
2405
2406/*
2407 * Seq_file read operations for /smack/load-self2
2408 */
2409
2410static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2411{
2412 struct task_smack *tsp = current_security();
2413
2414 return smk_seq_start(s, pos, &tsp->smk_rules);
2415}
2416
2417static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2418{
2419 struct task_smack *tsp = current_security();
2420
2421 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2422}
2423
2424static int load_self2_seq_show(struct seq_file *s, void *v)
2425{
2426 struct list_head *list = v;
2427 struct smack_rule *srp =
2428 list_entry_rcu(list, struct smack_rule, list);
2429
2430 smk_rule_show(s, srp, SMK_LONGLABEL);
2431
2432 return 0;
2433}
2434
2435static const struct seq_operations load_self2_seq_ops = {
2436 .start = load_self2_seq_start,
2437 .next = load_self2_seq_next,
2438 .show = load_self2_seq_show,
2439 .stop = smk_seq_stop,
2440};
2441
2442/**
2443 * smk_open_load_self2 - open() for /smack/load-self2
2444 * @inode: inode structure representing file
2445 * @file: "load" file pointer
2446 *
2447 * For reading, use load_seq_* seq_file reading operations.
2448 */
2449static int smk_open_load_self2(struct inode *inode, struct file *file)
2450{
2451 return seq_open(file, &load_self2_seq_ops);
2452}
2453
2454/**
2455 * smk_write_load_self2 - write() for /smack/load-self2
2456 * @file: file pointer, not actually used
2457 * @buf: where to get the data from
2458 * @count: bytes sent
2459 * @ppos: where to start - must be 0
2460 *
2461 */
2462static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2463 size_t count, loff_t *ppos)
2464{
2465 struct task_smack *tsp = current_security();
2466
2467 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2468 &tsp->smk_rules_lock, SMK_LONG_FMT);
2469}
2470
2471static const struct file_operations smk_load_self2_ops = {
2472 .open = smk_open_load_self2,
2473 .read = seq_read,
2474 .llseek = seq_lseek,
2475 .write = smk_write_load_self2,
2476 .release = seq_release,
2477};
2478
2479/**
2480 * smk_write_access2 - handle access check transaction
2481 * @file: file pointer
2482 * @buf: data from user space
2483 * @count: bytes sent
2484 * @ppos: where to start - must be 0
2485 */
2486static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2487 size_t count, loff_t *ppos)
2488{
2489 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2490}
2491
2492static const struct file_operations smk_access2_ops = {
2493 .write = smk_write_access2,
2494 .read = simple_transaction_read,
2495 .release = simple_transaction_release,
2496 .llseek = generic_file_llseek,
2497};
2498
2499/**
2500 * smk_write_revoke_subj - write() for /smack/revoke-subject
2501 * @file: file pointer
2502 * @buf: data from user space
2503 * @count: bytes sent
2504 * @ppos: where to start - must be 0
2505 */
2506static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2507 size_t count, loff_t *ppos)
2508{
2509 char *data;
2510 const char *cp;
2511 struct smack_known *skp;
2512 struct smack_rule *sp;
2513 struct list_head *rule_list;
2514 struct mutex *rule_lock;
2515 int rc = count;
2516
2517 if (*ppos != 0)
2518 return -EINVAL;
2519
2520 if (!smack_privileged(CAP_MAC_ADMIN))
2521 return -EPERM;
2522
2523 if (count == 0 || count > SMK_LONGLABEL)
2524 return -EINVAL;
2525
2526 data = memdup_user(buf, count);
2527 if (IS_ERR(data))
2528 return PTR_ERR(data);
2529
2530 cp = smk_parse_smack(data, count);
2531 if (IS_ERR(cp)) {
2532 rc = PTR_ERR(cp);
2533 goto out_data;
2534 }
2535
2536 skp = smk_find_entry(cp);
2537 if (skp == NULL)
2538 goto out_cp;
2539
2540 rule_list = &skp->smk_rules;
2541 rule_lock = &skp->smk_rules_lock;
2542
2543 mutex_lock(rule_lock);
2544
2545 list_for_each_entry_rcu(sp, rule_list, list)
2546 sp->smk_access = 0;
2547
2548 mutex_unlock(rule_lock);
2549
2550out_cp:
2551 kfree(cp);
2552out_data:
2553 kfree(data);
2554
2555 return rc;
2556}
2557
2558static const struct file_operations smk_revoke_subj_ops = {
2559 .write = smk_write_revoke_subj,
2560 .read = simple_transaction_read,
2561 .release = simple_transaction_release,
2562 .llseek = generic_file_llseek,
2563};
2564
2565/**
2566 * smk_init_sysfs - initialize /sys/fs/smackfs
2567 *
2568 */
2569static int smk_init_sysfs(void)
2570{
2571 return sysfs_create_mount_point(fs_kobj, "smackfs");
2572}
2573
2574/**
2575 * smk_write_change_rule - write() for /smack/change-rule
2576 * @file: file pointer
2577 * @buf: data from user space
2578 * @count: bytes sent
2579 * @ppos: where to start - must be 0
2580 */
2581static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2582 size_t count, loff_t *ppos)
2583{
2584 /*
2585 * Must have privilege.
2586 */
2587 if (!smack_privileged(CAP_MAC_ADMIN))
2588 return -EPERM;
2589
2590 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2591 SMK_CHANGE_FMT);
2592}
2593
2594static const struct file_operations smk_change_rule_ops = {
2595 .write = smk_write_change_rule,
2596 .read = simple_transaction_read,
2597 .release = simple_transaction_release,
2598 .llseek = generic_file_llseek,
2599};
2600
2601/**
2602 * smk_read_syslog - read() for smackfs/syslog
2603 * @filp: file pointer, not actually used
2604 * @buf: where to put the result
2605 * @cn: maximum to send along
2606 * @ppos: where to start
2607 *
2608 * Returns number of bytes read or error code, as appropriate
2609 */
2610static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2611 size_t cn, loff_t *ppos)
2612{
2613 struct smack_known *skp;
2614 ssize_t rc = -EINVAL;
2615 int asize;
2616
2617 if (*ppos != 0)
2618 return 0;
2619
2620 if (smack_syslog_label == NULL)
2621 skp = &smack_known_star;
2622 else
2623 skp = smack_syslog_label;
2624
2625 asize = strlen(skp->smk_known) + 1;
2626
2627 if (cn >= asize)
2628 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2629 asize);
2630
2631 return rc;
2632}
2633
2634/**
2635 * smk_write_syslog - write() for smackfs/syslog
2636 * @file: file pointer, not actually used
2637 * @buf: where to get the data from
2638 * @count: bytes sent
2639 * @ppos: where to start
2640 *
2641 * Returns number of bytes written or error code, as appropriate
2642 */
2643static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2644 size_t count, loff_t *ppos)
2645{
2646 char *data;
2647 struct smack_known *skp;
2648 int rc = count;
2649
2650 if (!smack_privileged(CAP_MAC_ADMIN))
2651 return -EPERM;
2652
2653 data = memdup_user_nul(buf, count);
2654 if (IS_ERR(data))
2655 return PTR_ERR(data);
2656
2657 skp = smk_import_entry(data, count);
2658 if (IS_ERR(skp))
2659 rc = PTR_ERR(skp);
2660 else
2661 smack_syslog_label = skp;
2662
2663 kfree(data);
2664 return rc;
2665}
2666
2667static const struct file_operations smk_syslog_ops = {
2668 .read = smk_read_syslog,
2669 .write = smk_write_syslog,
2670 .llseek = default_llseek,
2671};
2672
2673/*
2674 * Seq_file read operations for /smack/relabel-self
2675 */
2676
2677static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2678{
2679 struct task_smack *tsp = current_security();
2680
2681 return smk_seq_start(s, pos, &tsp->smk_relabel);
2682}
2683
2684static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2685{
2686 struct task_smack *tsp = current_security();
2687
2688 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2689}
2690
2691static int relabel_self_seq_show(struct seq_file *s, void *v)
2692{
2693 struct list_head *list = v;
2694 struct smack_known_list_elem *sklep =
2695 list_entry(list, struct smack_known_list_elem, list);
2696
2697 seq_puts(s, sklep->smk_label->smk_known);
2698 seq_putc(s, ' ');
2699
2700 return 0;
2701}
2702
2703static const struct seq_operations relabel_self_seq_ops = {
2704 .start = relabel_self_seq_start,
2705 .next = relabel_self_seq_next,
2706 .show = relabel_self_seq_show,
2707 .stop = smk_seq_stop,
2708};
2709
2710/**
2711 * smk_open_relabel_self - open() for /smack/relabel-self
2712 * @inode: inode structure representing file
2713 * @file: "relabel-self" file pointer
2714 *
2715 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2716 * file_operations
2717 */
2718static int smk_open_relabel_self(struct inode *inode, struct file *file)
2719{
2720 return seq_open(file, &relabel_self_seq_ops);
2721}
2722
2723/**
2724 * smk_write_relabel_self - write() for /smack/relabel-self
2725 * @file: file pointer, not actually used
2726 * @buf: where to get the data from
2727 * @count: bytes sent
2728 * @ppos: where to start - must be 0
2729 *
2730 */
2731static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2732 size_t count, loff_t *ppos)
2733{
2734 struct task_smack *tsp = current_security();
2735 char *data;
2736 int rc;
2737 LIST_HEAD(list_tmp);
2738
2739 /*
2740 * Must have privilege.
2741 */
2742 if (!smack_privileged(CAP_MAC_ADMIN))
2743 return -EPERM;
2744
2745 /*
2746 * Enough data must be present.
2747 */
2748 if (*ppos != 0)
2749 return -EINVAL;
2750
2751 data = memdup_user_nul(buf, count);
2752 if (IS_ERR(data))
2753 return PTR_ERR(data);
2754
2755 rc = smk_parse_label_list(data, &list_tmp);
2756 kfree(data);
2757
2758 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2759 smk_destroy_label_list(&tsp->smk_relabel);
2760 list_splice(&list_tmp, &tsp->smk_relabel);
2761 return count;
2762 }
2763
2764 smk_destroy_label_list(&list_tmp);
2765 return rc;
2766}
2767
2768static const struct file_operations smk_relabel_self_ops = {
2769 .open = smk_open_relabel_self,
2770 .read = seq_read,
2771 .llseek = seq_lseek,
2772 .write = smk_write_relabel_self,
2773 .release = seq_release,
2774};
2775
2776/**
2777 * smk_read_ptrace - read() for /smack/ptrace
2778 * @filp: file pointer, not actually used
2779 * @buf: where to put the result
2780 * @count: maximum to send along
2781 * @ppos: where to start
2782 *
2783 * Returns number of bytes read or error code, as appropriate
2784 */
2785static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2786 size_t count, loff_t *ppos)
2787{
2788 char temp[32];
2789 ssize_t rc;
2790
2791 if (*ppos != 0)
2792 return 0;
2793
2794 sprintf(temp, "%d\n", smack_ptrace_rule);
2795 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2796 return rc;
2797}
2798
2799/**
2800 * smk_write_ptrace - write() for /smack/ptrace
2801 * @file: file pointer
2802 * @buf: data from user space
2803 * @count: bytes sent
2804 * @ppos: where to start - must be 0
2805 */
2806static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2807 size_t count, loff_t *ppos)
2808{
2809 char temp[32];
2810 int i;
2811
2812 if (!smack_privileged(CAP_MAC_ADMIN))
2813 return -EPERM;
2814
2815 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2816 return -EINVAL;
2817
2818 if (copy_from_user(temp, buf, count) != 0)
2819 return -EFAULT;
2820
2821 temp[count] = '\0';
2822
2823 if (sscanf(temp, "%d", &i) != 1)
2824 return -EINVAL;
2825 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2826 return -EINVAL;
2827 smack_ptrace_rule = i;
2828
2829 return count;
2830}
2831
2832static const struct file_operations smk_ptrace_ops = {
2833 .write = smk_write_ptrace,
2834 .read = smk_read_ptrace,
2835 .llseek = default_llseek,
2836};
2837
2838/**
2839 * smk_fill_super - fill the smackfs superblock
2840 * @sb: the empty superblock
2841 * @data: unused
2842 * @silent: unused
2843 *
2844 * Fill in the well known entries for the smack filesystem
2845 *
2846 * Returns 0 on success, an error code on failure
2847 */
2848static int smk_fill_super(struct super_block *sb, void *data, int silent)
2849{
2850 int rc;
2851 struct inode *root_inode;
2852
2853 static struct tree_descr smack_files[] = {
2854 [SMK_LOAD] = {
2855 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2856 [SMK_CIPSO] = {
2857 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2858 [SMK_DOI] = {
2859 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2860 [SMK_DIRECT] = {
2861 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2862 [SMK_AMBIENT] = {
2863 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2864 [SMK_NET4ADDR] = {
2865 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2866 [SMK_ONLYCAP] = {
2867 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2868 [SMK_LOGGING] = {
2869 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2870 [SMK_LOAD_SELF] = {
2871 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2872 [SMK_ACCESSES] = {
2873 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2874 [SMK_MAPPED] = {
2875 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2876 [SMK_LOAD2] = {
2877 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2878 [SMK_LOAD_SELF2] = {
2879 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2880 [SMK_ACCESS2] = {
2881 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2882 [SMK_CIPSO2] = {
2883 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2884 [SMK_REVOKE_SUBJ] = {
2885 "revoke-subject", &smk_revoke_subj_ops,
2886 S_IRUGO|S_IWUSR},
2887 [SMK_CHANGE_RULE] = {
2888 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2889 [SMK_SYSLOG] = {
2890 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2891 [SMK_PTRACE] = {
2892 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2893#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2894 [SMK_UNCONFINED] = {
2895 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2896#endif
2897#if IS_ENABLED(CONFIG_IPV6)
2898 [SMK_NET6ADDR] = {
2899 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2900#endif /* CONFIG_IPV6 */
2901 [SMK_RELABEL_SELF] = {
2902 "relabel-self", &smk_relabel_self_ops,
2903 S_IRUGO|S_IWUGO},
2904 /* last one */
2905 {""}
2906 };
2907
2908 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2909 if (rc != 0) {
2910 printk(KERN_ERR "%s failed %d while creating inodes\n",
2911 __func__, rc);
2912 return rc;
2913 }
2914
2915 root_inode = d_inode(sb->s_root);
2916
2917 return 0;
2918}
2919
2920/**
2921 * smk_mount - get the smackfs superblock
2922 * @fs_type: passed along without comment
2923 * @flags: passed along without comment
2924 * @dev_name: passed along without comment
2925 * @data: passed along without comment
2926 *
2927 * Just passes everything along.
2928 *
2929 * Returns what the lower level code does.
2930 */
2931static struct dentry *smk_mount(struct file_system_type *fs_type,
2932 int flags, const char *dev_name, void *data)
2933{
2934 return mount_single(fs_type, flags, data, smk_fill_super);
2935}
2936
2937static struct file_system_type smk_fs_type = {
2938 .name = "smackfs",
2939 .mount = smk_mount,
2940 .kill_sb = kill_litter_super,
2941};
2942
2943static struct vfsmount *smackfs_mount;
2944
2945static int __init smk_preset_netlabel(struct smack_known *skp)
2946{
2947 skp->smk_netlabel.domain = skp->smk_known;
2948 skp->smk_netlabel.flags =
2949 NETLBL_SECATTR_DOMAIN | NETLBL_SECATTR_MLS_LVL;
2950 return smk_netlbl_mls(smack_cipso_direct, skp->smk_known,
2951 &skp->smk_netlabel, strlen(skp->smk_known));
2952}
2953
2954/**
2955 * init_smk_fs - get the smackfs superblock
2956 *
2957 * register the smackfs
2958 *
2959 * Do not register smackfs if Smack wasn't enabled
2960 * on boot. We can not put this method normally under the
2961 * smack_init() code path since the security subsystem get
2962 * initialized before the vfs caches.
2963 *
2964 * Returns true if we were not chosen on boot or if
2965 * we were chosen and filesystem registration succeeded.
2966 */
2967static int __init init_smk_fs(void)
2968{
2969 int err;
2970 int rc;
2971
2972 if (smack_enabled == 0)
2973 return 0;
2974
2975 err = smk_init_sysfs();
2976 if (err)
2977 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
2978
2979 err = register_filesystem(&smk_fs_type);
2980 if (!err) {
2981 smackfs_mount = kern_mount(&smk_fs_type);
2982 if (IS_ERR(smackfs_mount)) {
2983 printk(KERN_ERR "smackfs: could not mount!\n");
2984 err = PTR_ERR(smackfs_mount);
2985 smackfs_mount = NULL;
2986 }
2987 }
2988
2989 smk_cipso_doi();
2990 smk_unlbl_ambient(NULL);
2991
2992 rc = smk_preset_netlabel(&smack_known_floor);
2993 if (err == 0 && rc < 0)
2994 err = rc;
2995 rc = smk_preset_netlabel(&smack_known_hat);
2996 if (err == 0 && rc < 0)
2997 err = rc;
2998 rc = smk_preset_netlabel(&smack_known_huh);
2999 if (err == 0 && rc < 0)
3000 err = rc;
3001 rc = smk_preset_netlabel(&smack_known_star);
3002 if (err == 0 && rc < 0)
3003 err = rc;
3004 rc = smk_preset_netlabel(&smack_known_web);
3005 if (err == 0 && rc < 0)
3006 err = rc;
3007
3008 return err;
3009}
3010
3011__initcall(init_smk_fs);