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