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