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