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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 *
5 * Authors:
6 * Casey Schaufler <casey@schaufler-ca.com>
7 * Ahmed S. Darwish <darwish.07@gmail.com>
8 *
9 * Special thanks to the authors of selinuxfs.
10 *
11 * Karl MacMillan <kmacmillan@tresys.com>
12 * James Morris <jmorris@redhat.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/vmalloc.h>
17#include <linux/security.h>
18#include <linux/mutex.h>
19#include <linux/slab.h>
20#include <net/net_namespace.h>
21#include <net/cipso_ipv4.h>
22#include <linux/seq_file.h>
23#include <linux/ctype.h>
24#include <linux/audit.h>
25#include <linux/magic.h>
26#include <linux/mount.h>
27#include <linux/fs_context.h>
28#include "smack.h"
29
30#define BEBITS (sizeof(__be32) * 8)
31/*
32 * smackfs pseudo filesystem.
33 */
34
35enum smk_inos {
36 SMK_ROOT_INO = 2,
37 SMK_LOAD = 3, /* load policy */
38 SMK_CIPSO = 4, /* load label -> CIPSO mapping */
39 SMK_DOI = 5, /* CIPSO DOI */
40 SMK_DIRECT = 6, /* CIPSO level indicating direct label */
41 SMK_AMBIENT = 7, /* internet ambient label */
42 SMK_NET4ADDR = 8, /* single label hosts */
43 SMK_ONLYCAP = 9, /* the only "capable" label */
44 SMK_LOGGING = 10, /* logging */
45 SMK_LOAD_SELF = 11, /* task specific rules */
46 SMK_ACCESSES = 12, /* access policy */
47 SMK_MAPPED = 13, /* CIPSO level indicating mapped label */
48 SMK_LOAD2 = 14, /* load policy with long labels */
49 SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */
50 SMK_ACCESS2 = 16, /* make an access check with long labels */
51 SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */
52 SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */
53 SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */
54 SMK_SYSLOG = 20, /* change syslog label) */
55 SMK_PTRACE = 21, /* set ptrace rule */
56#ifdef CONFIG_SECURITY_SMACK_BRINGUP
57 SMK_UNCONFINED = 22, /* define an unconfined label */
58#endif
59#if IS_ENABLED(CONFIG_IPV6)
60 SMK_NET6ADDR = 23, /* single label IPv6 hosts */
61#endif /* CONFIG_IPV6 */
62 SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */
63};
64
65/*
66 * List locks
67 */
68static DEFINE_MUTEX(smack_cipso_lock);
69static DEFINE_MUTEX(smack_ambient_lock);
70static DEFINE_MUTEX(smk_net4addr_lock);
71#if IS_ENABLED(CONFIG_IPV6)
72static DEFINE_MUTEX(smk_net6addr_lock);
73#endif /* CONFIG_IPV6 */
74
75/*
76 * This is the "ambient" label for network traffic.
77 * If it isn't somehow marked, use this.
78 * It can be reset via smackfs/ambient
79 */
80struct smack_known *smack_net_ambient;
81
82/*
83 * This is the level in a CIPSO header that indicates a
84 * smack label is contained directly in the category set.
85 * It can be reset via smackfs/direct
86 */
87int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT;
88
89/*
90 * This is the level in a CIPSO header that indicates a
91 * secid is contained directly in the category set.
92 * It can be reset via smackfs/mapped
93 */
94int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT;
95
96#ifdef CONFIG_SECURITY_SMACK_BRINGUP
97/*
98 * Allow one label to be unconfined. This is for
99 * debugging and application bring-up purposes only.
100 * It is bad and wrong, but everyone seems to expect
101 * to have it.
102 */
103struct smack_known *smack_unconfined;
104#endif
105
106/*
107 * If this value is set restrict syslog use to the label specified.
108 * It can be reset via smackfs/syslog
109 */
110struct smack_known *smack_syslog_label;
111
112/*
113 * Ptrace current rule
114 * SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based)
115 * SMACK_PTRACE_EXACT labels must match, but can be overriden with
116 * CAP_SYS_PTRACE
117 * SMACK_PTRACE_DRACONIAN labels must match, CAP_SYS_PTRACE has no effect
118 */
119int smack_ptrace_rule = SMACK_PTRACE_DEFAULT;
120
121/*
122 * Certain IP addresses may be designated as single label hosts.
123 * Packets are sent there unlabeled, but only from tasks that
124 * can write to the specified label.
125 */
126
127LIST_HEAD(smk_net4addr_list);
128#if IS_ENABLED(CONFIG_IPV6)
129LIST_HEAD(smk_net6addr_list);
130#endif /* CONFIG_IPV6 */
131
132/*
133 * Rule lists are maintained for each label.
134 */
135struct smack_parsed_rule {
136 struct smack_known *smk_subject;
137 struct smack_known *smk_object;
138 int smk_access1;
139 int smk_access2;
140};
141
142static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT;
143
144/*
145 * Values for parsing cipso rules
146 * SMK_DIGITLEN: Length of a digit field in a rule.
147 * SMK_CIPSOMIN: Minimum possible cipso rule length.
148 * SMK_CIPSOMAX: Maximum possible cipso rule length.
149 */
150#define SMK_DIGITLEN 4
151#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN)
152#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN)
153
154/*
155 * Values for parsing MAC rules
156 * SMK_ACCESS: Maximum possible combination of access permissions
157 * SMK_ACCESSLEN: Maximum length for a rule access field
158 * SMK_LOADLEN: Smack rule length
159 */
160#define SMK_OACCESS "rwxa"
161#define SMK_ACCESS "rwxatl"
162#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1)
163#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1)
164#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN)
165#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN)
166
167/*
168 * Stricly for CIPSO level manipulation.
169 * Set the category bit number in a smack label sized buffer.
170 */
171static inline void smack_catset_bit(unsigned int cat, char *catsetp)
172{
173 if (cat == 0 || cat > (SMK_CIPSOLEN * 8))
174 return;
175
176 catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8);
177}
178
179/**
180 * smk_netlabel_audit_set - fill a netlbl_audit struct
181 * @nap: structure to fill
182 */
183static void smk_netlabel_audit_set(struct netlbl_audit *nap)
184{
185 nap->loginuid = audit_get_loginuid(current);
186 nap->sessionid = audit_get_sessionid(current);
187 nap->prop.smack.skp = smk_of_current();
188}
189
190/*
191 * Value for parsing single label host rules
192 * "1.2.3.4 X"
193 */
194#define SMK_NETLBLADDRMIN 9
195
196/**
197 * smk_set_access - add a rule to the rule list or replace an old rule
198 * @srp: the rule to add or replace
199 * @rule_list: the list of rules
200 * @rule_lock: the rule list lock
201 *
202 * Looks through the current subject/object/access list for
203 * the subject/object pair and replaces the access that was
204 * there. If the pair isn't found add it with the specified
205 * access.
206 *
207 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
208 * during the allocation of the new pair to add.
209 */
210static int smk_set_access(struct smack_parsed_rule *srp,
211 struct list_head *rule_list,
212 struct mutex *rule_lock)
213{
214 struct smack_rule *sp;
215 int found = 0;
216 int rc = 0;
217
218 mutex_lock(rule_lock);
219
220 /*
221 * Because the object label is less likely to match
222 * than the subject label check it first
223 */
224 list_for_each_entry_rcu(sp, rule_list, list) {
225 if (sp->smk_object == srp->smk_object &&
226 sp->smk_subject == srp->smk_subject) {
227 found = 1;
228 sp->smk_access |= srp->smk_access1;
229 sp->smk_access &= ~srp->smk_access2;
230 break;
231 }
232 }
233
234 if (found == 0) {
235 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
236 if (sp == NULL) {
237 rc = -ENOMEM;
238 goto out;
239 }
240
241 sp->smk_subject = srp->smk_subject;
242 sp->smk_object = srp->smk_object;
243 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
244
245 list_add_rcu(&sp->list, rule_list);
246 }
247
248out:
249 mutex_unlock(rule_lock);
250 return rc;
251}
252
253/**
254 * smk_perm_from_str - parse smack accesses from a text string
255 * @string: a text string that contains a Smack accesses code
256 *
257 * Returns an integer with respective bits set for specified accesses.
258 */
259static int smk_perm_from_str(const char *string)
260{
261 int perm = 0;
262 const char *cp;
263
264 for (cp = string; ; cp++)
265 switch (*cp) {
266 case '-':
267 break;
268 case 'r':
269 case 'R':
270 perm |= MAY_READ;
271 break;
272 case 'w':
273 case 'W':
274 perm |= MAY_WRITE;
275 break;
276 case 'x':
277 case 'X':
278 perm |= MAY_EXEC;
279 break;
280 case 'a':
281 case 'A':
282 perm |= MAY_APPEND;
283 break;
284 case 't':
285 case 'T':
286 perm |= MAY_TRANSMUTE;
287 break;
288 case 'l':
289 case 'L':
290 perm |= MAY_LOCK;
291 break;
292 case 'b':
293 case 'B':
294 perm |= MAY_BRINGUP;
295 break;
296 default:
297 return perm;
298 }
299}
300
301/**
302 * smk_fill_rule - Fill Smack rule from strings
303 * @subject: subject label string
304 * @object: object label string
305 * @access1: access string
306 * @access2: string with permissions to be removed
307 * @rule: Smack rule
308 * @import: if non-zero, import labels
309 * @len: label length limit
310 *
311 * Returns 0 on success, appropriate error code on failure.
312 */
313static int smk_fill_rule(const char *subject, const char *object,
314 const char *access1, const char *access2,
315 struct smack_parsed_rule *rule, int import,
316 int len)
317{
318 const char *cp;
319 struct smack_known *skp;
320
321 if (import) {
322 rule->smk_subject = smk_import_entry(subject, len);
323 if (IS_ERR(rule->smk_subject))
324 return PTR_ERR(rule->smk_subject);
325
326 rule->smk_object = smk_import_entry(object, len);
327 if (IS_ERR(rule->smk_object))
328 return PTR_ERR(rule->smk_object);
329 } else {
330 cp = smk_parse_smack(subject, len);
331 if (IS_ERR(cp))
332 return PTR_ERR(cp);
333 skp = smk_find_entry(cp);
334 kfree(cp);
335 if (skp == NULL)
336 return -ENOENT;
337 rule->smk_subject = skp;
338
339 cp = smk_parse_smack(object, len);
340 if (IS_ERR(cp))
341 return PTR_ERR(cp);
342 skp = smk_find_entry(cp);
343 kfree(cp);
344 if (skp == NULL)
345 return -ENOENT;
346 rule->smk_object = skp;
347 }
348
349 rule->smk_access1 = smk_perm_from_str(access1);
350 if (access2)
351 rule->smk_access2 = smk_perm_from_str(access2);
352 else
353 rule->smk_access2 = ~rule->smk_access1;
354
355 return 0;
356}
357
358/**
359 * smk_parse_rule - parse Smack rule from load string
360 * @data: string to be parsed whose size is SMK_LOADLEN
361 * @rule: Smack rule
362 * @import: if non-zero, import labels
363 *
364 * Returns 0 on success, -1 on errors.
365 */
366static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
367 int import)
368{
369 int rc;
370
371 rc = smk_fill_rule(data, data + SMK_LABELLEN,
372 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
373 import, SMK_LABELLEN);
374 return rc;
375}
376
377/**
378 * smk_parse_long_rule - parse Smack rule from rule string
379 * @data: string to be parsed, null terminated
380 * @rule: Will be filled with Smack parsed rule
381 * @import: if non-zero, import labels
382 * @tokens: number of substrings expected in data
383 *
384 * Returns number of processed bytes on success, -ERRNO on failure.
385 */
386static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
387 int import, int tokens)
388{
389 ssize_t cnt = 0;
390 char *tok[4];
391 int rc;
392 int i;
393
394 /*
395 * Parsing the rule in-place, filling all white-spaces with '\0'
396 */
397 for (i = 0; i < tokens; ++i) {
398 while (isspace(data[cnt]))
399 data[cnt++] = '\0';
400
401 if (data[cnt] == '\0')
402 /* Unexpected end of data */
403 return -EINVAL;
404
405 tok[i] = data + cnt;
406
407 while (data[cnt] && !isspace(data[cnt]))
408 ++cnt;
409 }
410 while (isspace(data[cnt]))
411 data[cnt++] = '\0';
412
413 while (i < 4)
414 tok[i++] = NULL;
415
416 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
417 return rc == 0 ? cnt : rc;
418}
419
420#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
421#define SMK_LONG_FMT 1 /* Variable long label format */
422#define SMK_CHANGE_FMT 2 /* Rule modification format */
423/**
424 * smk_write_rules_list - write() for any /smack rule file
425 * @file: file pointer, not actually used
426 * @buf: where to get the data from
427 * @count: bytes sent
428 * @ppos: where to start - must be 0
429 * @rule_list: the list of rules to write to
430 * @rule_lock: lock for the rule list
431 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
432 *
433 * Get one smack access rule from above.
434 * The format for SMK_LONG_FMT is:
435 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
436 * The format for SMK_FIXED24_FMT is exactly:
437 * "subject object rwxat"
438 * The format for SMK_CHANGE_FMT is:
439 * "subject<whitespace>object<whitespace>
440 * acc_enable<whitespace>acc_disable[<whitespace>...]"
441 */
442static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
443 size_t count, loff_t *ppos,
444 struct list_head *rule_list,
445 struct mutex *rule_lock, int format)
446{
447 struct smack_parsed_rule rule;
448 char *data;
449 int rc;
450 int trunc = 0;
451 int tokens;
452 ssize_t cnt = 0;
453
454 /*
455 * No partial writes.
456 * Enough data must be present.
457 */
458 if (*ppos != 0)
459 return -EINVAL;
460
461 if (format == SMK_FIXED24_FMT) {
462 /*
463 * Minor hack for backward compatibility
464 */
465 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
466 return -EINVAL;
467 } else {
468 if (count >= PAGE_SIZE) {
469 count = PAGE_SIZE - 1;
470 trunc = 1;
471 }
472 }
473
474 data = memdup_user_nul(buf, count);
475 if (IS_ERR(data))
476 return PTR_ERR(data);
477
478 /*
479 * In case of parsing only part of user buf,
480 * avoid having partial rule at the data buffer
481 */
482 if (trunc) {
483 while (count > 0 && (data[count - 1] != '\n'))
484 --count;
485 if (count == 0) {
486 rc = -EINVAL;
487 goto out;
488 }
489 }
490
491 data[count] = '\0';
492 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
493 while (cnt < count) {
494 if (format == SMK_FIXED24_FMT) {
495 rc = smk_parse_rule(data, &rule, 1);
496 if (rc < 0)
497 goto out;
498 cnt = count;
499 } else {
500 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
501 if (rc < 0)
502 goto out;
503 if (rc == 0) {
504 rc = -EINVAL;
505 goto out;
506 }
507 cnt += rc;
508 }
509
510 if (rule_list == NULL)
511 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
512 &rule.smk_subject->smk_rules_lock);
513 else
514 rc = smk_set_access(&rule, rule_list, rule_lock);
515
516 if (rc)
517 goto out;
518 }
519
520 rc = cnt;
521out:
522 kfree(data);
523 return rc;
524}
525
526/*
527 * Core logic for smackfs seq list operations.
528 */
529
530static void *smk_seq_start(struct seq_file *s, loff_t *pos,
531 struct list_head *head)
532{
533 struct list_head *list;
534 int i = *pos;
535
536 rcu_read_lock();
537 for (list = rcu_dereference(list_next_rcu(head));
538 list != head;
539 list = rcu_dereference(list_next_rcu(list))) {
540 if (i-- == 0)
541 return list;
542 }
543
544 return NULL;
545}
546
547static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
548 struct list_head *head)
549{
550 struct list_head *list = v;
551
552 ++*pos;
553 list = rcu_dereference(list_next_rcu(list));
554
555 return (list == head) ? NULL : list;
556}
557
558static void smk_seq_stop(struct seq_file *s, void *v)
559{
560 rcu_read_unlock();
561}
562
563static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
564{
565 /*
566 * Don't show any rules with label names too long for
567 * interface file (/smack/load or /smack/load2)
568 * because you should expect to be able to write
569 * anything you read back.
570 */
571 if (strlen(srp->smk_subject->smk_known) >= max ||
572 strlen(srp->smk_object->smk_known) >= max)
573 return;
574
575 if (srp->smk_access == 0)
576 return;
577
578 seq_printf(s, "%s %s",
579 srp->smk_subject->smk_known,
580 srp->smk_object->smk_known);
581
582 seq_putc(s, ' ');
583
584 if (srp->smk_access & MAY_READ)
585 seq_putc(s, 'r');
586 if (srp->smk_access & MAY_WRITE)
587 seq_putc(s, 'w');
588 if (srp->smk_access & MAY_EXEC)
589 seq_putc(s, 'x');
590 if (srp->smk_access & MAY_APPEND)
591 seq_putc(s, 'a');
592 if (srp->smk_access & MAY_TRANSMUTE)
593 seq_putc(s, 't');
594 if (srp->smk_access & MAY_LOCK)
595 seq_putc(s, 'l');
596 if (srp->smk_access & MAY_BRINGUP)
597 seq_putc(s, 'b');
598
599 seq_putc(s, '\n');
600}
601
602/*
603 * Seq_file read operations for /smack/load
604 */
605
606static void *load2_seq_start(struct seq_file *s, loff_t *pos)
607{
608 return smk_seq_start(s, pos, &smack_known_list);
609}
610
611static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
612{
613 return smk_seq_next(s, v, pos, &smack_known_list);
614}
615
616static int load_seq_show(struct seq_file *s, void *v)
617{
618 struct list_head *list = v;
619 struct smack_rule *srp;
620 struct smack_known *skp =
621 list_entry_rcu(list, struct smack_known, list);
622
623 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
624 smk_rule_show(s, srp, SMK_LABELLEN);
625
626 return 0;
627}
628
629static const struct seq_operations load_seq_ops = {
630 .start = load2_seq_start,
631 .next = load2_seq_next,
632 .show = load_seq_show,
633 .stop = smk_seq_stop,
634};
635
636/**
637 * smk_open_load - open() for /smack/load
638 * @inode: inode structure representing file
639 * @file: "load" file pointer
640 *
641 * For reading, use load_seq_* seq_file reading operations.
642 */
643static int smk_open_load(struct inode *inode, struct file *file)
644{
645 return seq_open(file, &load_seq_ops);
646}
647
648/**
649 * smk_write_load - write() for /smack/load
650 * @file: file pointer, not actually used
651 * @buf: where to get the data from
652 * @count: bytes sent
653 * @ppos: where to start - must be 0
654 *
655 */
656static ssize_t smk_write_load(struct file *file, const char __user *buf,
657 size_t count, loff_t *ppos)
658{
659 /*
660 * Must have privilege.
661 * No partial writes.
662 * Enough data must be present.
663 */
664 if (!smack_privileged(CAP_MAC_ADMIN))
665 return -EPERM;
666
667 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
668 SMK_FIXED24_FMT);
669}
670
671static const struct file_operations smk_load_ops = {
672 .open = smk_open_load,
673 .read = seq_read,
674 .llseek = seq_lseek,
675 .write = smk_write_load,
676 .release = seq_release,
677};
678
679/**
680 * smk_cipso_doi - initialize the CIPSO domain
681 */
682static void smk_cipso_doi(void)
683{
684 int rc;
685 struct cipso_v4_doi *doip;
686 struct netlbl_audit nai;
687
688 smk_netlabel_audit_set(&nai);
689
690 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
691 if (rc != 0)
692 printk(KERN_WARNING "%s:%d remove rc = %d\n",
693 __func__, __LINE__, rc);
694
695 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
696 doip->map.std = NULL;
697 doip->doi = smk_cipso_doi_value;
698 doip->type = CIPSO_V4_MAP_PASS;
699 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
700 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
701 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
702
703 rc = netlbl_cfg_cipsov4_add(doip, &nai);
704 if (rc != 0) {
705 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
706 __func__, __LINE__, rc);
707 kfree(doip);
708 return;
709 }
710 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
711 if (rc != 0) {
712 printk(KERN_WARNING "%s:%d map add rc = %d\n",
713 __func__, __LINE__, rc);
714 netlbl_cfg_cipsov4_del(doip->doi, &nai);
715 return;
716 }
717}
718
719/**
720 * smk_unlbl_ambient - initialize the unlabeled domain
721 * @oldambient: previous domain string
722 */
723static void smk_unlbl_ambient(char *oldambient)
724{
725 int rc;
726 struct netlbl_audit nai;
727
728 smk_netlabel_audit_set(&nai);
729
730 if (oldambient != NULL) {
731 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
732 if (rc != 0)
733 printk(KERN_WARNING "%s:%d remove rc = %d\n",
734 __func__, __LINE__, rc);
735 }
736 if (smack_net_ambient == NULL)
737 smack_net_ambient = &smack_known_floor;
738
739 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
740 NULL, NULL, &nai);
741 if (rc != 0)
742 printk(KERN_WARNING "%s:%d add rc = %d\n",
743 __func__, __LINE__, rc);
744}
745
746/*
747 * Seq_file read operations for /smack/cipso
748 */
749
750static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
751{
752 return smk_seq_start(s, pos, &smack_known_list);
753}
754
755static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
756{
757 return smk_seq_next(s, v, pos, &smack_known_list);
758}
759
760/*
761 * Print cipso labels in format:
762 * label level[/cat[,cat]]
763 */
764static int cipso_seq_show(struct seq_file *s, void *v)
765{
766 struct list_head *list = v;
767 struct smack_known *skp =
768 list_entry_rcu(list, struct smack_known, list);
769 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
770 char sep = '/';
771 int i;
772
773 /*
774 * Don't show a label that could not have been set using
775 * /smack/cipso. This is in support of the notion that
776 * anything read from /smack/cipso ought to be writeable
777 * to /smack/cipso.
778 *
779 * /smack/cipso2 should be used instead.
780 */
781 if (strlen(skp->smk_known) >= SMK_LABELLEN)
782 return 0;
783
784 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
785
786 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
787 i = netlbl_catmap_walk(cmp, i + 1)) {
788 seq_printf(s, "%c%d", sep, i);
789 sep = ',';
790 }
791
792 seq_putc(s, '\n');
793
794 return 0;
795}
796
797static const struct seq_operations cipso_seq_ops = {
798 .start = cipso_seq_start,
799 .next = cipso_seq_next,
800 .show = cipso_seq_show,
801 .stop = smk_seq_stop,
802};
803
804/**
805 * smk_open_cipso - open() for /smack/cipso
806 * @inode: inode structure representing file
807 * @file: "cipso" file pointer
808 *
809 * Connect our cipso_seq_* operations with /smack/cipso
810 * file_operations
811 */
812static int smk_open_cipso(struct inode *inode, struct file *file)
813{
814 return seq_open(file, &cipso_seq_ops);
815}
816
817/**
818 * smk_set_cipso - do the work for write() for cipso and cipso2
819 * @file: file pointer, not actually used
820 * @buf: where to get the data from
821 * @count: bytes sent
822 * @ppos: where to start
823 * @format: /smack/cipso or /smack/cipso2
824 *
825 * Accepts only one cipso rule per write call.
826 * Returns number of bytes written or error code, as appropriate
827 */
828static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
829 size_t count, loff_t *ppos, int format)
830{
831 struct netlbl_lsm_catmap *old_cat, *new_cat = NULL;
832 struct smack_known *skp;
833 struct netlbl_lsm_secattr ncats;
834 char mapcatset[SMK_CIPSOLEN];
835 int maplevel;
836 unsigned int cat;
837 int catlen;
838 ssize_t rc = -EINVAL;
839 char *data = NULL;
840 char *rule;
841 int ret;
842 int i;
843
844 /*
845 * Must have privilege.
846 * No partial writes.
847 * Enough data must be present.
848 */
849 if (!smack_privileged(CAP_MAC_ADMIN))
850 return -EPERM;
851 if (*ppos != 0)
852 return -EINVAL;
853 if (format == SMK_FIXED24_FMT &&
854 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
855 return -EINVAL;
856 if (count > PAGE_SIZE)
857 return -EINVAL;
858
859 data = memdup_user_nul(buf, count);
860 if (IS_ERR(data))
861 return PTR_ERR(data);
862
863 rule = data;
864 /*
865 * Only allow one writer at a time. Writes should be
866 * quite rare and small in any case.
867 */
868 mutex_lock(&smack_cipso_lock);
869
870 skp = smk_import_entry(rule, 0);
871 if (IS_ERR(skp)) {
872 rc = PTR_ERR(skp);
873 goto out;
874 }
875
876 if (format == SMK_FIXED24_FMT)
877 rule += SMK_LABELLEN;
878 else
879 rule += strlen(skp->smk_known) + 1;
880
881 if (rule > data + count) {
882 rc = -EOVERFLOW;
883 goto out;
884 }
885
886 ret = sscanf(rule, "%d", &maplevel);
887 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
888 goto out;
889
890 rule += SMK_DIGITLEN;
891 if (rule > data + count) {
892 rc = -EOVERFLOW;
893 goto out;
894 }
895
896 ret = sscanf(rule, "%d", &catlen);
897 if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM)
898 goto out;
899
900 if (format == SMK_FIXED24_FMT &&
901 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
902 goto out;
903
904 memset(mapcatset, 0, sizeof(mapcatset));
905
906 for (i = 0; i < catlen; i++) {
907 rule += SMK_DIGITLEN;
908 if (rule > data + count) {
909 rc = -EOVERFLOW;
910 goto out;
911 }
912 ret = sscanf(rule, "%u", &cat);
913 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
914 goto out;
915
916 smack_catset_bit(cat, mapcatset);
917 }
918 ncats.flags = 0;
919 if (catlen == 0) {
920 ncats.attr.mls.cat = NULL;
921 ncats.attr.mls.lvl = maplevel;
922 new_cat = netlbl_catmap_alloc(GFP_ATOMIC);
923 if (new_cat)
924 new_cat->next = ncats.attr.mls.cat;
925 ncats.attr.mls.cat = new_cat;
926 skp->smk_netlabel.flags &= ~(1U << 3);
927 rc = 0;
928 } else {
929 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
930 }
931 if (rc >= 0) {
932 old_cat = skp->smk_netlabel.attr.mls.cat;
933 rcu_assign_pointer(skp->smk_netlabel.attr.mls.cat, ncats.attr.mls.cat);
934 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
935 synchronize_rcu();
936 netlbl_catmap_free(old_cat);
937 rc = count;
938 /*
939 * This mapping may have been cached, so clear the cache.
940 */
941 netlbl_cache_invalidate();
942 }
943
944out:
945 mutex_unlock(&smack_cipso_lock);
946 kfree(data);
947 return rc;
948}
949
950/**
951 * smk_write_cipso - write() for /smack/cipso
952 * @file: file pointer, not actually used
953 * @buf: where to get the data from
954 * @count: bytes sent
955 * @ppos: where to start
956 *
957 * Accepts only one cipso rule per write call.
958 * Returns number of bytes written or error code, as appropriate
959 */
960static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
961 size_t count, loff_t *ppos)
962{
963 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
964}
965
966static const struct file_operations smk_cipso_ops = {
967 .open = smk_open_cipso,
968 .read = seq_read,
969 .llseek = seq_lseek,
970 .write = smk_write_cipso,
971 .release = seq_release,
972};
973
974/*
975 * Seq_file read operations for /smack/cipso2
976 */
977
978/*
979 * Print cipso labels in format:
980 * label level[/cat[,cat]]
981 */
982static int cipso2_seq_show(struct seq_file *s, void *v)
983{
984 struct list_head *list = v;
985 struct smack_known *skp =
986 list_entry_rcu(list, struct smack_known, list);
987 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
988 char sep = '/';
989 int i;
990
991 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
992
993 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
994 i = netlbl_catmap_walk(cmp, i + 1)) {
995 seq_printf(s, "%c%d", sep, i);
996 sep = ',';
997 }
998
999 seq_putc(s, '\n');
1000
1001 return 0;
1002}
1003
1004static const struct seq_operations cipso2_seq_ops = {
1005 .start = cipso_seq_start,
1006 .next = cipso_seq_next,
1007 .show = cipso2_seq_show,
1008 .stop = smk_seq_stop,
1009};
1010
1011/**
1012 * smk_open_cipso2 - open() for /smack/cipso2
1013 * @inode: inode structure representing file
1014 * @file: "cipso2" file pointer
1015 *
1016 * Connect our cipso_seq_* operations with /smack/cipso2
1017 * file_operations
1018 */
1019static int smk_open_cipso2(struct inode *inode, struct file *file)
1020{
1021 return seq_open(file, &cipso2_seq_ops);
1022}
1023
1024/**
1025 * smk_write_cipso2 - write() for /smack/cipso2
1026 * @file: file pointer, not actually used
1027 * @buf: where to get the data from
1028 * @count: bytes sent
1029 * @ppos: where to start
1030 *
1031 * Accepts only one cipso rule per write call.
1032 * Returns number of bytes written or error code, as appropriate
1033 */
1034static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1035 size_t count, loff_t *ppos)
1036{
1037 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1038}
1039
1040static const struct file_operations smk_cipso2_ops = {
1041 .open = smk_open_cipso2,
1042 .read = seq_read,
1043 .llseek = seq_lseek,
1044 .write = smk_write_cipso2,
1045 .release = seq_release,
1046};
1047
1048/*
1049 * Seq_file read operations for /smack/netlabel
1050 */
1051
1052static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1053{
1054 return smk_seq_start(s, pos, &smk_net4addr_list);
1055}
1056
1057static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1058{
1059 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1060}
1061
1062/*
1063 * Print host/label pairs
1064 */
1065static int net4addr_seq_show(struct seq_file *s, void *v)
1066{
1067 struct list_head *list = v;
1068 struct smk_net4addr *skp =
1069 list_entry_rcu(list, struct smk_net4addr, list);
1070 char *kp = SMACK_CIPSO_OPTION;
1071
1072 if (skp->smk_label != NULL)
1073 kp = skp->smk_label->smk_known;
1074 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1075 skp->smk_masks, kp);
1076
1077 return 0;
1078}
1079
1080static const struct seq_operations net4addr_seq_ops = {
1081 .start = net4addr_seq_start,
1082 .next = net4addr_seq_next,
1083 .show = net4addr_seq_show,
1084 .stop = smk_seq_stop,
1085};
1086
1087/**
1088 * smk_open_net4addr - open() for /smack/netlabel
1089 * @inode: inode structure representing file
1090 * @file: "netlabel" file pointer
1091 *
1092 * Connect our net4addr_seq_* operations with /smack/netlabel
1093 * file_operations
1094 */
1095static int smk_open_net4addr(struct inode *inode, struct file *file)
1096{
1097 return seq_open(file, &net4addr_seq_ops);
1098}
1099
1100/**
1101 * smk_net4addr_insert
1102 * @new : netlabel to insert
1103 *
1104 * This helper insert netlabel in the smack_net4addrs list
1105 * sorted by netmask length (longest to smallest)
1106 * locked by &smk_net4addr_lock in smk_write_net4addr
1107 *
1108 */
1109static void smk_net4addr_insert(struct smk_net4addr *new)
1110{
1111 struct smk_net4addr *m;
1112 struct smk_net4addr *m_next;
1113
1114 if (list_empty(&smk_net4addr_list)) {
1115 list_add_rcu(&new->list, &smk_net4addr_list);
1116 return;
1117 }
1118
1119 m = list_entry_rcu(smk_net4addr_list.next,
1120 struct smk_net4addr, list);
1121
1122 /* the comparison '>' is a bit hacky, but works */
1123 if (new->smk_masks > m->smk_masks) {
1124 list_add_rcu(&new->list, &smk_net4addr_list);
1125 return;
1126 }
1127
1128 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1129 if (list_is_last(&m->list, &smk_net4addr_list)) {
1130 list_add_rcu(&new->list, &m->list);
1131 return;
1132 }
1133 m_next = list_entry_rcu(m->list.next,
1134 struct smk_net4addr, list);
1135 if (new->smk_masks > m_next->smk_masks) {
1136 list_add_rcu(&new->list, &m->list);
1137 return;
1138 }
1139 }
1140}
1141
1142
1143/**
1144 * smk_write_net4addr - write() for /smack/netlabel
1145 * @file: file pointer, not actually used
1146 * @buf: where to get the data from
1147 * @count: bytes sent
1148 * @ppos: where to start
1149 *
1150 * Accepts only one net4addr per write call.
1151 * Returns number of bytes written or error code, as appropriate
1152 */
1153static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1154 size_t count, loff_t *ppos)
1155{
1156 struct smk_net4addr *snp;
1157 struct sockaddr_in newname;
1158 char *smack;
1159 struct smack_known *skp = NULL;
1160 char *data;
1161 char *host = (char *)&newname.sin_addr.s_addr;
1162 int rc;
1163 struct netlbl_audit audit_info;
1164 struct in_addr mask;
1165 unsigned int m;
1166 unsigned int masks;
1167 int found;
1168 u32 mask_bits = (1<<31);
1169 __be32 nsa;
1170 u32 temp_mask;
1171
1172 /*
1173 * Must have privilege.
1174 * No partial writes.
1175 * Enough data must be present.
1176 * "<addr/mask, as a.b.c.d/e><space><label>"
1177 * "<addr, as a.b.c.d><space><label>"
1178 */
1179 if (!smack_privileged(CAP_MAC_ADMIN))
1180 return -EPERM;
1181 if (*ppos != 0)
1182 return -EINVAL;
1183 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1184 return -EINVAL;
1185
1186 data = memdup_user_nul(buf, count);
1187 if (IS_ERR(data))
1188 return PTR_ERR(data);
1189
1190 smack = kzalloc(count + 1, GFP_KERNEL);
1191 if (smack == NULL) {
1192 rc = -ENOMEM;
1193 goto free_data_out;
1194 }
1195
1196 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1197 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1198 if (rc != 6) {
1199 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1200 &host[0], &host[1], &host[2], &host[3], smack);
1201 if (rc != 5) {
1202 rc = -EINVAL;
1203 goto free_out;
1204 }
1205 masks = 32;
1206 }
1207 if (masks > BEBITS) {
1208 rc = -EINVAL;
1209 goto free_out;
1210 }
1211
1212 /*
1213 * If smack begins with '-', it is an option, don't import it
1214 */
1215 if (smack[0] != '-') {
1216 skp = smk_import_entry(smack, 0);
1217 if (IS_ERR(skp)) {
1218 rc = PTR_ERR(skp);
1219 goto free_out;
1220 }
1221 } else {
1222 /*
1223 * Only the -CIPSO option is supported for IPv4
1224 */
1225 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1226 rc = -EINVAL;
1227 goto free_out;
1228 }
1229 }
1230
1231 for (m = masks, temp_mask = 0; m > 0; m--) {
1232 temp_mask |= mask_bits;
1233 mask_bits >>= 1;
1234 }
1235 mask.s_addr = cpu_to_be32(temp_mask);
1236
1237 newname.sin_addr.s_addr &= mask.s_addr;
1238 /*
1239 * Only allow one writer at a time. Writes should be
1240 * quite rare and small in any case.
1241 */
1242 mutex_lock(&smk_net4addr_lock);
1243
1244 nsa = newname.sin_addr.s_addr;
1245 /* try to find if the prefix is already in the list */
1246 found = 0;
1247 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1248 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1249 found = 1;
1250 break;
1251 }
1252 }
1253 smk_netlabel_audit_set(&audit_info);
1254
1255 if (found == 0) {
1256 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1257 if (snp == NULL)
1258 rc = -ENOMEM;
1259 else {
1260 rc = 0;
1261 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1262 snp->smk_mask.s_addr = mask.s_addr;
1263 snp->smk_label = skp;
1264 snp->smk_masks = masks;
1265 smk_net4addr_insert(snp);
1266 }
1267 } else {
1268 /*
1269 * Delete the unlabeled entry, only if the previous label
1270 * wasn't the special CIPSO option
1271 */
1272 if (snp->smk_label != NULL)
1273 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1274 &snp->smk_host, &snp->smk_mask,
1275 PF_INET, &audit_info);
1276 else
1277 rc = 0;
1278 snp->smk_label = skp;
1279 }
1280
1281 /*
1282 * Now tell netlabel about the single label nature of
1283 * this host so that incoming packets get labeled.
1284 * but only if we didn't get the special CIPSO option
1285 */
1286 if (rc == 0 && skp != NULL)
1287 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1288 &snp->smk_host, &snp->smk_mask, PF_INET,
1289 snp->smk_label->smk_secid, &audit_info);
1290
1291 if (rc == 0)
1292 rc = count;
1293
1294 mutex_unlock(&smk_net4addr_lock);
1295
1296free_out:
1297 kfree(smack);
1298free_data_out:
1299 kfree(data);
1300
1301 return rc;
1302}
1303
1304static const struct file_operations smk_net4addr_ops = {
1305 .open = smk_open_net4addr,
1306 .read = seq_read,
1307 .llseek = seq_lseek,
1308 .write = smk_write_net4addr,
1309 .release = seq_release,
1310};
1311
1312#if IS_ENABLED(CONFIG_IPV6)
1313/*
1314 * Seq_file read operations for /smack/netlabel6
1315 */
1316
1317static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1318{
1319 return smk_seq_start(s, pos, &smk_net6addr_list);
1320}
1321
1322static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1323{
1324 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1325}
1326
1327/*
1328 * Print host/label pairs
1329 */
1330static int net6addr_seq_show(struct seq_file *s, void *v)
1331{
1332 struct list_head *list = v;
1333 struct smk_net6addr *skp =
1334 list_entry(list, struct smk_net6addr, list);
1335
1336 if (skp->smk_label != NULL)
1337 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1338 skp->smk_label->smk_known);
1339
1340 return 0;
1341}
1342
1343static const struct seq_operations net6addr_seq_ops = {
1344 .start = net6addr_seq_start,
1345 .next = net6addr_seq_next,
1346 .show = net6addr_seq_show,
1347 .stop = smk_seq_stop,
1348};
1349
1350/**
1351 * smk_open_net6addr - open() for /smack/netlabel
1352 * @inode: inode structure representing file
1353 * @file: "netlabel" file pointer
1354 *
1355 * Connect our net6addr_seq_* operations with /smack/netlabel
1356 * file_operations
1357 */
1358static int smk_open_net6addr(struct inode *inode, struct file *file)
1359{
1360 return seq_open(file, &net6addr_seq_ops);
1361}
1362
1363/**
1364 * smk_net6addr_insert
1365 * @new : entry to insert
1366 *
1367 * This inserts an entry in the smack_net6addrs list
1368 * sorted by netmask length (longest to smallest)
1369 * locked by &smk_net6addr_lock in smk_write_net6addr
1370 *
1371 */
1372static void smk_net6addr_insert(struct smk_net6addr *new)
1373{
1374 struct smk_net6addr *m_next;
1375 struct smk_net6addr *m;
1376
1377 if (list_empty(&smk_net6addr_list)) {
1378 list_add_rcu(&new->list, &smk_net6addr_list);
1379 return;
1380 }
1381
1382 m = list_entry_rcu(smk_net6addr_list.next,
1383 struct smk_net6addr, list);
1384
1385 if (new->smk_masks > m->smk_masks) {
1386 list_add_rcu(&new->list, &smk_net6addr_list);
1387 return;
1388 }
1389
1390 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1391 if (list_is_last(&m->list, &smk_net6addr_list)) {
1392 list_add_rcu(&new->list, &m->list);
1393 return;
1394 }
1395 m_next = list_entry_rcu(m->list.next,
1396 struct smk_net6addr, list);
1397 if (new->smk_masks > m_next->smk_masks) {
1398 list_add_rcu(&new->list, &m->list);
1399 return;
1400 }
1401 }
1402}
1403
1404
1405/**
1406 * smk_write_net6addr - write() for /smack/netlabel
1407 * @file: file pointer, not actually used
1408 * @buf: where to get the data from
1409 * @count: bytes sent
1410 * @ppos: where to start
1411 *
1412 * Accepts only one net6addr per write call.
1413 * Returns number of bytes written or error code, as appropriate
1414 */
1415static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1416 size_t count, loff_t *ppos)
1417{
1418 struct smk_net6addr *snp;
1419 struct in6_addr newname;
1420 struct in6_addr fullmask;
1421 struct smack_known *skp = NULL;
1422 char *smack;
1423 char *data;
1424 int rc = 0;
1425 int found = 0;
1426 int i;
1427 unsigned int scanned[8];
1428 unsigned int m;
1429 unsigned int mask = 128;
1430
1431 /*
1432 * Must have privilege.
1433 * No partial writes.
1434 * Enough data must be present.
1435 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1436 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1437 */
1438 if (!smack_privileged(CAP_MAC_ADMIN))
1439 return -EPERM;
1440 if (*ppos != 0)
1441 return -EINVAL;
1442 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1443 return -EINVAL;
1444
1445 data = memdup_user_nul(buf, count);
1446 if (IS_ERR(data))
1447 return PTR_ERR(data);
1448
1449 smack = kzalloc(count + 1, GFP_KERNEL);
1450 if (smack == NULL) {
1451 rc = -ENOMEM;
1452 goto free_data_out;
1453 }
1454
1455 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1456 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1457 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1458 &mask, smack);
1459 if (i != 10) {
1460 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1461 &scanned[0], &scanned[1], &scanned[2],
1462 &scanned[3], &scanned[4], &scanned[5],
1463 &scanned[6], &scanned[7], smack);
1464 if (i != 9) {
1465 rc = -EINVAL;
1466 goto free_out;
1467 }
1468 }
1469 if (mask > 128) {
1470 rc = -EINVAL;
1471 goto free_out;
1472 }
1473 for (i = 0; i < 8; i++) {
1474 if (scanned[i] > 0xffff) {
1475 rc = -EINVAL;
1476 goto free_out;
1477 }
1478 newname.s6_addr16[i] = htons(scanned[i]);
1479 }
1480
1481 /*
1482 * If smack begins with '-', it is an option, don't import it
1483 */
1484 if (smack[0] != '-') {
1485 skp = smk_import_entry(smack, 0);
1486 if (IS_ERR(skp)) {
1487 rc = PTR_ERR(skp);
1488 goto free_out;
1489 }
1490 } else {
1491 /*
1492 * Only -DELETE is supported for IPv6
1493 */
1494 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1495 rc = -EINVAL;
1496 goto free_out;
1497 }
1498 }
1499
1500 for (i = 0, m = mask; i < 8; i++) {
1501 if (m >= 16) {
1502 fullmask.s6_addr16[i] = 0xffff;
1503 m -= 16;
1504 } else if (m > 0) {
1505 fullmask.s6_addr16[i] = (1 << m) - 1;
1506 m = 0;
1507 } else
1508 fullmask.s6_addr16[i] = 0;
1509 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1510 }
1511
1512 /*
1513 * Only allow one writer at a time. Writes should be
1514 * quite rare and small in any case.
1515 */
1516 mutex_lock(&smk_net6addr_lock);
1517 /*
1518 * Try to find the prefix in the list
1519 */
1520 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1521 if (mask != snp->smk_masks)
1522 continue;
1523 for (found = 1, i = 0; i < 8; i++) {
1524 if (newname.s6_addr16[i] !=
1525 snp->smk_host.s6_addr16[i]) {
1526 found = 0;
1527 break;
1528 }
1529 }
1530 if (found == 1)
1531 break;
1532 }
1533 if (found == 0) {
1534 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1535 if (snp == NULL)
1536 rc = -ENOMEM;
1537 else {
1538 snp->smk_host = newname;
1539 snp->smk_mask = fullmask;
1540 snp->smk_masks = mask;
1541 snp->smk_label = skp;
1542 smk_net6addr_insert(snp);
1543 }
1544 } else {
1545 snp->smk_label = skp;
1546 }
1547
1548 if (rc == 0)
1549 rc = count;
1550
1551 mutex_unlock(&smk_net6addr_lock);
1552
1553free_out:
1554 kfree(smack);
1555free_data_out:
1556 kfree(data);
1557
1558 return rc;
1559}
1560
1561static const struct file_operations smk_net6addr_ops = {
1562 .open = smk_open_net6addr,
1563 .read = seq_read,
1564 .llseek = seq_lseek,
1565 .write = smk_write_net6addr,
1566 .release = seq_release,
1567};
1568#endif /* CONFIG_IPV6 */
1569
1570/**
1571 * smk_read_doi - read() for /smack/doi
1572 * @filp: file pointer, not actually used
1573 * @buf: where to put the result
1574 * @count: maximum to send along
1575 * @ppos: where to start
1576 *
1577 * Returns number of bytes read or error code, as appropriate
1578 */
1579static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1580 size_t count, loff_t *ppos)
1581{
1582 char temp[80];
1583 ssize_t rc;
1584
1585 if (*ppos != 0)
1586 return 0;
1587
1588 sprintf(temp, "%d", smk_cipso_doi_value);
1589 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1590
1591 return rc;
1592}
1593
1594/**
1595 * smk_write_doi - write() for /smack/doi
1596 * @file: file pointer, not actually used
1597 * @buf: where to get the data from
1598 * @count: bytes sent
1599 * @ppos: where to start
1600 *
1601 * Returns number of bytes written or error code, as appropriate
1602 */
1603static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1604 size_t count, loff_t *ppos)
1605{
1606 char temp[80];
1607 int i;
1608
1609 if (!smack_privileged(CAP_MAC_ADMIN))
1610 return -EPERM;
1611
1612 if (count >= sizeof(temp) || count == 0)
1613 return -EINVAL;
1614
1615 if (copy_from_user(temp, buf, count) != 0)
1616 return -EFAULT;
1617
1618 temp[count] = '\0';
1619
1620 if (sscanf(temp, "%d", &i) != 1)
1621 return -EINVAL;
1622
1623 smk_cipso_doi_value = i;
1624
1625 smk_cipso_doi();
1626
1627 return count;
1628}
1629
1630static const struct file_operations smk_doi_ops = {
1631 .read = smk_read_doi,
1632 .write = smk_write_doi,
1633 .llseek = default_llseek,
1634};
1635
1636/**
1637 * smk_read_direct - read() for /smack/direct
1638 * @filp: file pointer, not actually used
1639 * @buf: where to put the result
1640 * @count: maximum to send along
1641 * @ppos: where to start
1642 *
1643 * Returns number of bytes read or error code, as appropriate
1644 */
1645static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1646 size_t count, loff_t *ppos)
1647{
1648 char temp[80];
1649 ssize_t rc;
1650
1651 if (*ppos != 0)
1652 return 0;
1653
1654 sprintf(temp, "%d", smack_cipso_direct);
1655 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1656
1657 return rc;
1658}
1659
1660/**
1661 * smk_write_direct - write() for /smack/direct
1662 * @file: file pointer, not actually used
1663 * @buf: where to get the data from
1664 * @count: bytes sent
1665 * @ppos: where to start
1666 *
1667 * Returns number of bytes written or error code, as appropriate
1668 */
1669static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1670 size_t count, loff_t *ppos)
1671{
1672 struct smack_known *skp;
1673 char temp[80];
1674 int i;
1675
1676 if (!smack_privileged(CAP_MAC_ADMIN))
1677 return -EPERM;
1678
1679 if (count >= sizeof(temp) || count == 0)
1680 return -EINVAL;
1681
1682 if (copy_from_user(temp, buf, count) != 0)
1683 return -EFAULT;
1684
1685 temp[count] = '\0';
1686
1687 if (sscanf(temp, "%d", &i) != 1)
1688 return -EINVAL;
1689
1690 /*
1691 * Don't do anything if the value hasn't actually changed.
1692 * If it is changing reset the level on entries that were
1693 * set up to be direct when they were created.
1694 */
1695 if (smack_cipso_direct != i) {
1696 mutex_lock(&smack_known_lock);
1697 list_for_each_entry_rcu(skp, &smack_known_list, list)
1698 if (skp->smk_netlabel.attr.mls.lvl ==
1699 smack_cipso_direct)
1700 skp->smk_netlabel.attr.mls.lvl = i;
1701 smack_cipso_direct = i;
1702 mutex_unlock(&smack_known_lock);
1703 }
1704
1705 return count;
1706}
1707
1708static const struct file_operations smk_direct_ops = {
1709 .read = smk_read_direct,
1710 .write = smk_write_direct,
1711 .llseek = default_llseek,
1712};
1713
1714/**
1715 * smk_read_mapped - read() for /smack/mapped
1716 * @filp: file pointer, not actually used
1717 * @buf: where to put the result
1718 * @count: maximum to send along
1719 * @ppos: where to start
1720 *
1721 * Returns number of bytes read or error code, as appropriate
1722 */
1723static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1724 size_t count, loff_t *ppos)
1725{
1726 char temp[80];
1727 ssize_t rc;
1728
1729 if (*ppos != 0)
1730 return 0;
1731
1732 sprintf(temp, "%d", smack_cipso_mapped);
1733 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1734
1735 return rc;
1736}
1737
1738/**
1739 * smk_write_mapped - write() for /smack/mapped
1740 * @file: file pointer, not actually used
1741 * @buf: where to get the data from
1742 * @count: bytes sent
1743 * @ppos: where to start
1744 *
1745 * Returns number of bytes written or error code, as appropriate
1746 */
1747static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1748 size_t count, loff_t *ppos)
1749{
1750 struct smack_known *skp;
1751 char temp[80];
1752 int i;
1753
1754 if (!smack_privileged(CAP_MAC_ADMIN))
1755 return -EPERM;
1756
1757 if (count >= sizeof(temp) || count == 0)
1758 return -EINVAL;
1759
1760 if (copy_from_user(temp, buf, count) != 0)
1761 return -EFAULT;
1762
1763 temp[count] = '\0';
1764
1765 if (sscanf(temp, "%d", &i) != 1)
1766 return -EINVAL;
1767
1768 /*
1769 * Don't do anything if the value hasn't actually changed.
1770 * If it is changing reset the level on entries that were
1771 * set up to be mapped when they were created.
1772 */
1773 if (smack_cipso_mapped != i) {
1774 mutex_lock(&smack_known_lock);
1775 list_for_each_entry_rcu(skp, &smack_known_list, list)
1776 if (skp->smk_netlabel.attr.mls.lvl ==
1777 smack_cipso_mapped)
1778 skp->smk_netlabel.attr.mls.lvl = i;
1779 smack_cipso_mapped = i;
1780 mutex_unlock(&smack_known_lock);
1781 }
1782
1783 return count;
1784}
1785
1786static const struct file_operations smk_mapped_ops = {
1787 .read = smk_read_mapped,
1788 .write = smk_write_mapped,
1789 .llseek = default_llseek,
1790};
1791
1792/**
1793 * smk_read_ambient - read() for /smack/ambient
1794 * @filp: file pointer, not actually used
1795 * @buf: where to put the result
1796 * @cn: maximum to send along
1797 * @ppos: where to start
1798 *
1799 * Returns number of bytes read or error code, as appropriate
1800 */
1801static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1802 size_t cn, loff_t *ppos)
1803{
1804 ssize_t rc;
1805 int asize;
1806
1807 if (*ppos != 0)
1808 return 0;
1809 /*
1810 * Being careful to avoid a problem in the case where
1811 * smack_net_ambient gets changed in midstream.
1812 */
1813 mutex_lock(&smack_ambient_lock);
1814
1815 asize = strlen(smack_net_ambient->smk_known) + 1;
1816
1817 if (cn >= asize)
1818 rc = simple_read_from_buffer(buf, cn, ppos,
1819 smack_net_ambient->smk_known,
1820 asize);
1821 else
1822 rc = -EINVAL;
1823
1824 mutex_unlock(&smack_ambient_lock);
1825
1826 return rc;
1827}
1828
1829/**
1830 * smk_write_ambient - write() for /smack/ambient
1831 * @file: file pointer, not actually used
1832 * @buf: where to get the data from
1833 * @count: bytes sent
1834 * @ppos: where to start
1835 *
1836 * Returns number of bytes written or error code, as appropriate
1837 */
1838static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1839 size_t count, loff_t *ppos)
1840{
1841 struct smack_known *skp;
1842 char *oldambient;
1843 char *data;
1844 int rc = count;
1845
1846 if (!smack_privileged(CAP_MAC_ADMIN))
1847 return -EPERM;
1848
1849 /* Enough data must be present */
1850 if (count == 0 || count > PAGE_SIZE)
1851 return -EINVAL;
1852
1853 data = memdup_user_nul(buf, count);
1854 if (IS_ERR(data))
1855 return PTR_ERR(data);
1856
1857 skp = smk_import_entry(data, count);
1858 if (IS_ERR(skp)) {
1859 rc = PTR_ERR(skp);
1860 goto out;
1861 }
1862
1863 mutex_lock(&smack_ambient_lock);
1864
1865 oldambient = smack_net_ambient->smk_known;
1866 smack_net_ambient = skp;
1867 smk_unlbl_ambient(oldambient);
1868
1869 mutex_unlock(&smack_ambient_lock);
1870
1871out:
1872 kfree(data);
1873 return rc;
1874}
1875
1876static const struct file_operations smk_ambient_ops = {
1877 .read = smk_read_ambient,
1878 .write = smk_write_ambient,
1879 .llseek = default_llseek,
1880};
1881
1882/*
1883 * Seq_file operations for /smack/onlycap
1884 */
1885static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1886{
1887 return smk_seq_start(s, pos, &smack_onlycap_list);
1888}
1889
1890static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1891{
1892 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1893}
1894
1895static int onlycap_seq_show(struct seq_file *s, void *v)
1896{
1897 struct list_head *list = v;
1898 struct smack_known_list_elem *sklep =
1899 list_entry_rcu(list, struct smack_known_list_elem, list);
1900
1901 seq_puts(s, sklep->smk_label->smk_known);
1902 seq_putc(s, ' ');
1903
1904 return 0;
1905}
1906
1907static const struct seq_operations onlycap_seq_ops = {
1908 .start = onlycap_seq_start,
1909 .next = onlycap_seq_next,
1910 .show = onlycap_seq_show,
1911 .stop = smk_seq_stop,
1912};
1913
1914static int smk_open_onlycap(struct inode *inode, struct file *file)
1915{
1916 return seq_open(file, &onlycap_seq_ops);
1917}
1918
1919/**
1920 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1921 * The caller must hold appropriate mutex to prevent concurrent modifications
1922 * to the public list.
1923 * Private list is assumed to be not accessible to other threads yet.
1924 *
1925 * @public: public list
1926 * @private: private list
1927 */
1928static void smk_list_swap_rcu(struct list_head *public,
1929 struct list_head *private)
1930{
1931 struct list_head *first, *last;
1932
1933 if (list_empty(public)) {
1934 list_splice_init_rcu(private, public, synchronize_rcu);
1935 } else {
1936 /* Remember public list before replacing it */
1937 first = public->next;
1938 last = public->prev;
1939
1940 /* Publish private list in place of public in RCU-safe way */
1941 private->prev->next = public;
1942 private->next->prev = public;
1943 rcu_assign_pointer(public->next, private->next);
1944 public->prev = private->prev;
1945
1946 synchronize_rcu();
1947
1948 /* When all readers are done with the old public list,
1949 * attach it in place of private */
1950 private->next = first;
1951 private->prev = last;
1952 first->prev = private;
1953 last->next = private;
1954 }
1955}
1956
1957/**
1958 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1959 *
1960 * @data: the string to parse
1961 * @list: destination list
1962 *
1963 * Returns zero on success or error code, as appropriate
1964 */
1965static int smk_parse_label_list(char *data, struct list_head *list)
1966{
1967 char *tok;
1968 struct smack_known *skp;
1969 struct smack_known_list_elem *sklep;
1970
1971 while ((tok = strsep(&data, " ")) != NULL) {
1972 if (!*tok)
1973 continue;
1974
1975 skp = smk_import_entry(tok, 0);
1976 if (IS_ERR(skp))
1977 return PTR_ERR(skp);
1978
1979 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1980 if (sklep == NULL)
1981 return -ENOMEM;
1982
1983 sklep->smk_label = skp;
1984 list_add(&sklep->list, list);
1985 }
1986
1987 return 0;
1988}
1989
1990/**
1991 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1992 * @list: header pointer of the list to destroy
1993 */
1994void smk_destroy_label_list(struct list_head *list)
1995{
1996 struct smack_known_list_elem *sklep;
1997 struct smack_known_list_elem *sklep2;
1998
1999 list_for_each_entry_safe(sklep, sklep2, list, list)
2000 kfree(sklep);
2001
2002 INIT_LIST_HEAD(list);
2003}
2004
2005/**
2006 * smk_write_onlycap - write() for smackfs/onlycap
2007 * @file: file pointer, not actually used
2008 * @buf: where to get the data from
2009 * @count: bytes sent
2010 * @ppos: where to start
2011 *
2012 * Returns number of bytes written or error code, as appropriate
2013 */
2014static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2015 size_t count, loff_t *ppos)
2016{
2017 char *data;
2018 LIST_HEAD(list_tmp);
2019 int rc;
2020
2021 if (!smack_privileged(CAP_MAC_ADMIN))
2022 return -EPERM;
2023
2024 if (count > PAGE_SIZE)
2025 return -EINVAL;
2026
2027 data = memdup_user_nul(buf, count);
2028 if (IS_ERR(data))
2029 return PTR_ERR(data);
2030
2031 rc = smk_parse_label_list(data, &list_tmp);
2032 kfree(data);
2033
2034 /*
2035 * Clear the smack_onlycap on invalid label errors. This means
2036 * that we can pass a null string to unset the onlycap value.
2037 *
2038 * Importing will also reject a label beginning with '-',
2039 * so "-usecapabilities" will also work.
2040 *
2041 * But do so only on invalid label, not on system errors.
2042 * The invalid label must be first to count as clearing attempt.
2043 */
2044 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2045 mutex_lock(&smack_onlycap_lock);
2046 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2047 mutex_unlock(&smack_onlycap_lock);
2048 rc = count;
2049 }
2050
2051 smk_destroy_label_list(&list_tmp);
2052
2053 return rc;
2054}
2055
2056static const struct file_operations smk_onlycap_ops = {
2057 .open = smk_open_onlycap,
2058 .read = seq_read,
2059 .write = smk_write_onlycap,
2060 .llseek = seq_lseek,
2061 .release = seq_release,
2062};
2063
2064#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2065/**
2066 * smk_read_unconfined - read() for smackfs/unconfined
2067 * @filp: file pointer, not actually used
2068 * @buf: where to put the result
2069 * @cn: maximum to send along
2070 * @ppos: where to start
2071 *
2072 * Returns number of bytes read or error code, as appropriate
2073 */
2074static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2075 size_t cn, loff_t *ppos)
2076{
2077 char *smack = "";
2078 ssize_t rc = -EINVAL;
2079 int asize;
2080
2081 if (*ppos != 0)
2082 return 0;
2083
2084 if (smack_unconfined != NULL)
2085 smack = smack_unconfined->smk_known;
2086
2087 asize = strlen(smack) + 1;
2088
2089 if (cn >= asize)
2090 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2091
2092 return rc;
2093}
2094
2095/**
2096 * smk_write_unconfined - write() for smackfs/unconfined
2097 * @file: file pointer, not actually used
2098 * @buf: where to get the data from
2099 * @count: bytes sent
2100 * @ppos: where to start
2101 *
2102 * Returns number of bytes written or error code, as appropriate
2103 */
2104static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2105 size_t count, loff_t *ppos)
2106{
2107 char *data;
2108 struct smack_known *skp;
2109 int rc = count;
2110
2111 if (!smack_privileged(CAP_MAC_ADMIN))
2112 return -EPERM;
2113
2114 if (count > PAGE_SIZE)
2115 return -EINVAL;
2116
2117 data = memdup_user_nul(buf, count);
2118 if (IS_ERR(data))
2119 return PTR_ERR(data);
2120
2121 /*
2122 * Clear the smack_unconfined on invalid label errors. This means
2123 * that we can pass a null string to unset the unconfined value.
2124 *
2125 * Importing will also reject a label beginning with '-',
2126 * so "-confine" will also work.
2127 *
2128 * But do so only on invalid label, not on system errors.
2129 */
2130 skp = smk_import_entry(data, count);
2131 if (PTR_ERR(skp) == -EINVAL)
2132 skp = NULL;
2133 else if (IS_ERR(skp)) {
2134 rc = PTR_ERR(skp);
2135 goto freeout;
2136 }
2137
2138 smack_unconfined = skp;
2139
2140freeout:
2141 kfree(data);
2142 return rc;
2143}
2144
2145static const struct file_operations smk_unconfined_ops = {
2146 .read = smk_read_unconfined,
2147 .write = smk_write_unconfined,
2148 .llseek = default_llseek,
2149};
2150#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2151
2152/**
2153 * smk_read_logging - read() for /smack/logging
2154 * @filp: file pointer, not actually used
2155 * @buf: where to put the result
2156 * @count: maximum to send along
2157 * @ppos: where to start
2158 *
2159 * Returns number of bytes read or error code, as appropriate
2160 */
2161static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2162 size_t count, loff_t *ppos)
2163{
2164 char temp[32];
2165 ssize_t rc;
2166
2167 if (*ppos != 0)
2168 return 0;
2169
2170 sprintf(temp, "%d\n", log_policy);
2171 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2172 return rc;
2173}
2174
2175/**
2176 * smk_write_logging - write() for /smack/logging
2177 * @file: file pointer, not actually used
2178 * @buf: where to get the data from
2179 * @count: bytes sent
2180 * @ppos: where to start
2181 *
2182 * Returns number of bytes written or error code, as appropriate
2183 */
2184static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2185 size_t count, loff_t *ppos)
2186{
2187 char temp[32];
2188 int i;
2189
2190 if (!smack_privileged(CAP_MAC_ADMIN))
2191 return -EPERM;
2192
2193 if (count >= sizeof(temp) || count == 0)
2194 return -EINVAL;
2195
2196 if (copy_from_user(temp, buf, count) != 0)
2197 return -EFAULT;
2198
2199 temp[count] = '\0';
2200
2201 if (sscanf(temp, "%d", &i) != 1)
2202 return -EINVAL;
2203 if (i < 0 || i > 3)
2204 return -EINVAL;
2205 log_policy = i;
2206 return count;
2207}
2208
2209
2210
2211static const struct file_operations smk_logging_ops = {
2212 .read = smk_read_logging,
2213 .write = smk_write_logging,
2214 .llseek = default_llseek,
2215};
2216
2217/*
2218 * Seq_file read operations for /smack/load-self
2219 */
2220
2221static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2222{
2223 struct task_smack *tsp = smack_cred(current_cred());
2224
2225 return smk_seq_start(s, pos, &tsp->smk_rules);
2226}
2227
2228static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2229{
2230 struct task_smack *tsp = smack_cred(current_cred());
2231
2232 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2233}
2234
2235static int load_self_seq_show(struct seq_file *s, void *v)
2236{
2237 struct list_head *list = v;
2238 struct smack_rule *srp =
2239 list_entry_rcu(list, struct smack_rule, list);
2240
2241 smk_rule_show(s, srp, SMK_LABELLEN);
2242
2243 return 0;
2244}
2245
2246static const struct seq_operations load_self_seq_ops = {
2247 .start = load_self_seq_start,
2248 .next = load_self_seq_next,
2249 .show = load_self_seq_show,
2250 .stop = smk_seq_stop,
2251};
2252
2253
2254/**
2255 * smk_open_load_self - open() for /smack/load-self2
2256 * @inode: inode structure representing file
2257 * @file: "load" file pointer
2258 *
2259 * For reading, use load_seq_* seq_file reading operations.
2260 */
2261static int smk_open_load_self(struct inode *inode, struct file *file)
2262{
2263 return seq_open(file, &load_self_seq_ops);
2264}
2265
2266/**
2267 * smk_write_load_self - write() for /smack/load-self
2268 * @file: file pointer, not actually used
2269 * @buf: where to get the data from
2270 * @count: bytes sent
2271 * @ppos: where to start - must be 0
2272 *
2273 */
2274static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2275 size_t count, loff_t *ppos)
2276{
2277 struct task_smack *tsp = smack_cred(current_cred());
2278
2279 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2280 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2281}
2282
2283static const struct file_operations smk_load_self_ops = {
2284 .open = smk_open_load_self,
2285 .read = seq_read,
2286 .llseek = seq_lseek,
2287 .write = smk_write_load_self,
2288 .release = seq_release,
2289};
2290
2291/**
2292 * smk_user_access - handle access check transaction
2293 * @file: file pointer
2294 * @buf: data from user space
2295 * @count: bytes sent
2296 * @ppos: where to start - must be 0
2297 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
2298 */
2299static ssize_t smk_user_access(struct file *file, const char __user *buf,
2300 size_t count, loff_t *ppos, int format)
2301{
2302 struct smack_parsed_rule rule;
2303 char *data;
2304 int res;
2305
2306 data = simple_transaction_get(file, buf, count);
2307 if (IS_ERR(data))
2308 return PTR_ERR(data);
2309
2310 if (format == SMK_FIXED24_FMT) {
2311 if (count < SMK_LOADLEN)
2312 return -EINVAL;
2313 res = smk_parse_rule(data, &rule, 0);
2314 } else {
2315 /*
2316 * simple_transaction_get() returns null-terminated data
2317 */
2318 res = smk_parse_long_rule(data, &rule, 0, 3);
2319 }
2320
2321 if (res >= 0)
2322 res = smk_access(rule.smk_subject, rule.smk_object,
2323 rule.smk_access1, NULL);
2324 else if (res != -ENOENT)
2325 return res;
2326
2327 /*
2328 * smk_access() can return a value > 0 in the "bringup" case.
2329 */
2330 data[0] = res >= 0 ? '1' : '0';
2331 data[1] = '\0';
2332
2333 simple_transaction_set(file, 2);
2334
2335 if (format == SMK_FIXED24_FMT)
2336 return SMK_LOADLEN;
2337 return count;
2338}
2339
2340/**
2341 * smk_write_access - handle access check transaction
2342 * @file: file pointer
2343 * @buf: data from user space
2344 * @count: bytes sent
2345 * @ppos: where to start - must be 0
2346 */
2347static ssize_t smk_write_access(struct file *file, const char __user *buf,
2348 size_t count, loff_t *ppos)
2349{
2350 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2351}
2352
2353static const struct file_operations smk_access_ops = {
2354 .write = smk_write_access,
2355 .read = simple_transaction_read,
2356 .release = simple_transaction_release,
2357 .llseek = generic_file_llseek,
2358};
2359
2360
2361/*
2362 * Seq_file read operations for /smack/load2
2363 */
2364
2365static int load2_seq_show(struct seq_file *s, void *v)
2366{
2367 struct list_head *list = v;
2368 struct smack_rule *srp;
2369 struct smack_known *skp =
2370 list_entry_rcu(list, struct smack_known, list);
2371
2372 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2373 smk_rule_show(s, srp, SMK_LONGLABEL);
2374
2375 return 0;
2376}
2377
2378static const struct seq_operations load2_seq_ops = {
2379 .start = load2_seq_start,
2380 .next = load2_seq_next,
2381 .show = load2_seq_show,
2382 .stop = smk_seq_stop,
2383};
2384
2385/**
2386 * smk_open_load2 - open() for /smack/load2
2387 * @inode: inode structure representing file
2388 * @file: "load2" file pointer
2389 *
2390 * For reading, use load2_seq_* seq_file reading operations.
2391 */
2392static int smk_open_load2(struct inode *inode, struct file *file)
2393{
2394 return seq_open(file, &load2_seq_ops);
2395}
2396
2397/**
2398 * smk_write_load2 - write() for /smack/load2
2399 * @file: file pointer, not actually used
2400 * @buf: where to get the data from
2401 * @count: bytes sent
2402 * @ppos: where to start - must be 0
2403 *
2404 */
2405static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2406 size_t count, loff_t *ppos)
2407{
2408 /*
2409 * Must have privilege.
2410 */
2411 if (!smack_privileged(CAP_MAC_ADMIN))
2412 return -EPERM;
2413
2414 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2415 SMK_LONG_FMT);
2416}
2417
2418static const struct file_operations smk_load2_ops = {
2419 .open = smk_open_load2,
2420 .read = seq_read,
2421 .llseek = seq_lseek,
2422 .write = smk_write_load2,
2423 .release = seq_release,
2424};
2425
2426/*
2427 * Seq_file read operations for /smack/load-self2
2428 */
2429
2430static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2431{
2432 struct task_smack *tsp = smack_cred(current_cred());
2433
2434 return smk_seq_start(s, pos, &tsp->smk_rules);
2435}
2436
2437static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2438{
2439 struct task_smack *tsp = smack_cred(current_cred());
2440
2441 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2442}
2443
2444static int load_self2_seq_show(struct seq_file *s, void *v)
2445{
2446 struct list_head *list = v;
2447 struct smack_rule *srp =
2448 list_entry_rcu(list, struct smack_rule, list);
2449
2450 smk_rule_show(s, srp, SMK_LONGLABEL);
2451
2452 return 0;
2453}
2454
2455static const struct seq_operations load_self2_seq_ops = {
2456 .start = load_self2_seq_start,
2457 .next = load_self2_seq_next,
2458 .show = load_self2_seq_show,
2459 .stop = smk_seq_stop,
2460};
2461
2462/**
2463 * smk_open_load_self2 - open() for /smack/load-self2
2464 * @inode: inode structure representing file
2465 * @file: "load" file pointer
2466 *
2467 * For reading, use load_seq_* seq_file reading operations.
2468 */
2469static int smk_open_load_self2(struct inode *inode, struct file *file)
2470{
2471 return seq_open(file, &load_self2_seq_ops);
2472}
2473
2474/**
2475 * smk_write_load_self2 - write() for /smack/load-self2
2476 * @file: file pointer, not actually used
2477 * @buf: where to get the data from
2478 * @count: bytes sent
2479 * @ppos: where to start - must be 0
2480 *
2481 */
2482static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2483 size_t count, loff_t *ppos)
2484{
2485 struct task_smack *tsp = smack_cred(current_cred());
2486
2487 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2488 &tsp->smk_rules_lock, SMK_LONG_FMT);
2489}
2490
2491static const struct file_operations smk_load_self2_ops = {
2492 .open = smk_open_load_self2,
2493 .read = seq_read,
2494 .llseek = seq_lseek,
2495 .write = smk_write_load_self2,
2496 .release = seq_release,
2497};
2498
2499/**
2500 * smk_write_access2 - handle access check transaction
2501 * @file: file pointer
2502 * @buf: data from user space
2503 * @count: bytes sent
2504 * @ppos: where to start - must be 0
2505 */
2506static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2507 size_t count, loff_t *ppos)
2508{
2509 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2510}
2511
2512static const struct file_operations smk_access2_ops = {
2513 .write = smk_write_access2,
2514 .read = simple_transaction_read,
2515 .release = simple_transaction_release,
2516 .llseek = generic_file_llseek,
2517};
2518
2519/**
2520 * smk_write_revoke_subj - write() for /smack/revoke-subject
2521 * @file: file pointer
2522 * @buf: data from user space
2523 * @count: bytes sent
2524 * @ppos: where to start - must be 0
2525 */
2526static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2527 size_t count, loff_t *ppos)
2528{
2529 char *data;
2530 const char *cp;
2531 struct smack_known *skp;
2532 struct smack_rule *sp;
2533 struct list_head *rule_list;
2534 struct mutex *rule_lock;
2535 int rc = count;
2536
2537 if (*ppos != 0)
2538 return -EINVAL;
2539
2540 if (!smack_privileged(CAP_MAC_ADMIN))
2541 return -EPERM;
2542
2543 if (count == 0 || count > SMK_LONGLABEL)
2544 return -EINVAL;
2545
2546 data = memdup_user(buf, count);
2547 if (IS_ERR(data))
2548 return PTR_ERR(data);
2549
2550 cp = smk_parse_smack(data, count);
2551 if (IS_ERR(cp)) {
2552 rc = PTR_ERR(cp);
2553 goto out_data;
2554 }
2555
2556 skp = smk_find_entry(cp);
2557 if (skp == NULL)
2558 goto out_cp;
2559
2560 rule_list = &skp->smk_rules;
2561 rule_lock = &skp->smk_rules_lock;
2562
2563 mutex_lock(rule_lock);
2564
2565 list_for_each_entry_rcu(sp, rule_list, list)
2566 sp->smk_access = 0;
2567
2568 mutex_unlock(rule_lock);
2569
2570out_cp:
2571 kfree(cp);
2572out_data:
2573 kfree(data);
2574
2575 return rc;
2576}
2577
2578static const struct file_operations smk_revoke_subj_ops = {
2579 .write = smk_write_revoke_subj,
2580 .read = simple_transaction_read,
2581 .release = simple_transaction_release,
2582 .llseek = generic_file_llseek,
2583};
2584
2585/**
2586 * smk_init_sysfs - initialize /sys/fs/smackfs
2587 *
2588 */
2589static int smk_init_sysfs(void)
2590{
2591 return sysfs_create_mount_point(fs_kobj, "smackfs");
2592}
2593
2594/**
2595 * smk_write_change_rule - write() for /smack/change-rule
2596 * @file: file pointer
2597 * @buf: data from user space
2598 * @count: bytes sent
2599 * @ppos: where to start - must be 0
2600 */
2601static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2602 size_t count, loff_t *ppos)
2603{
2604 /*
2605 * Must have privilege.
2606 */
2607 if (!smack_privileged(CAP_MAC_ADMIN))
2608 return -EPERM;
2609
2610 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2611 SMK_CHANGE_FMT);
2612}
2613
2614static const struct file_operations smk_change_rule_ops = {
2615 .write = smk_write_change_rule,
2616 .read = simple_transaction_read,
2617 .release = simple_transaction_release,
2618 .llseek = generic_file_llseek,
2619};
2620
2621/**
2622 * smk_read_syslog - read() for smackfs/syslog
2623 * @filp: file pointer, not actually used
2624 * @buf: where to put the result
2625 * @cn: maximum to send along
2626 * @ppos: where to start
2627 *
2628 * Returns number of bytes read or error code, as appropriate
2629 */
2630static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2631 size_t cn, loff_t *ppos)
2632{
2633 struct smack_known *skp;
2634 ssize_t rc = -EINVAL;
2635 int asize;
2636
2637 if (*ppos != 0)
2638 return 0;
2639
2640 if (smack_syslog_label == NULL)
2641 skp = &smack_known_star;
2642 else
2643 skp = smack_syslog_label;
2644
2645 asize = strlen(skp->smk_known) + 1;
2646
2647 if (cn >= asize)
2648 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2649 asize);
2650
2651 return rc;
2652}
2653
2654/**
2655 * smk_write_syslog - write() for smackfs/syslog
2656 * @file: file pointer, not actually used
2657 * @buf: where to get the data from
2658 * @count: bytes sent
2659 * @ppos: where to start
2660 *
2661 * Returns number of bytes written or error code, as appropriate
2662 */
2663static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2664 size_t count, loff_t *ppos)
2665{
2666 char *data;
2667 struct smack_known *skp;
2668 int rc = count;
2669
2670 if (!smack_privileged(CAP_MAC_ADMIN))
2671 return -EPERM;
2672
2673 /* Enough data must be present */
2674 if (count == 0 || count > PAGE_SIZE)
2675 return -EINVAL;
2676
2677 data = memdup_user_nul(buf, count);
2678 if (IS_ERR(data))
2679 return PTR_ERR(data);
2680
2681 skp = smk_import_entry(data, count);
2682 if (IS_ERR(skp))
2683 rc = PTR_ERR(skp);
2684 else
2685 smack_syslog_label = skp;
2686
2687 kfree(data);
2688 return rc;
2689}
2690
2691static const struct file_operations smk_syslog_ops = {
2692 .read = smk_read_syslog,
2693 .write = smk_write_syslog,
2694 .llseek = default_llseek,
2695};
2696
2697/*
2698 * Seq_file read operations for /smack/relabel-self
2699 */
2700
2701static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2702{
2703 struct task_smack *tsp = smack_cred(current_cred());
2704
2705 return smk_seq_start(s, pos, &tsp->smk_relabel);
2706}
2707
2708static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2709{
2710 struct task_smack *tsp = smack_cred(current_cred());
2711
2712 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2713}
2714
2715static int relabel_self_seq_show(struct seq_file *s, void *v)
2716{
2717 struct list_head *list = v;
2718 struct smack_known_list_elem *sklep =
2719 list_entry(list, struct smack_known_list_elem, list);
2720
2721 seq_puts(s, sklep->smk_label->smk_known);
2722 seq_putc(s, ' ');
2723
2724 return 0;
2725}
2726
2727static const struct seq_operations relabel_self_seq_ops = {
2728 .start = relabel_self_seq_start,
2729 .next = relabel_self_seq_next,
2730 .show = relabel_self_seq_show,
2731 .stop = smk_seq_stop,
2732};
2733
2734/**
2735 * smk_open_relabel_self - open() for /smack/relabel-self
2736 * @inode: inode structure representing file
2737 * @file: "relabel-self" file pointer
2738 *
2739 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2740 * file_operations
2741 */
2742static int smk_open_relabel_self(struct inode *inode, struct file *file)
2743{
2744 return seq_open(file, &relabel_self_seq_ops);
2745}
2746
2747/**
2748 * smk_write_relabel_self - write() for /smack/relabel-self
2749 * @file: file pointer, not actually used
2750 * @buf: where to get the data from
2751 * @count: bytes sent
2752 * @ppos: where to start - must be 0
2753 *
2754 */
2755static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2756 size_t count, loff_t *ppos)
2757{
2758 char *data;
2759 int rc;
2760 LIST_HEAD(list_tmp);
2761
2762 /*
2763 * Must have privilege.
2764 */
2765 if (!smack_privileged(CAP_MAC_ADMIN))
2766 return -EPERM;
2767
2768 /*
2769 * No partial write.
2770 * Enough data must be present.
2771 */
2772 if (*ppos != 0)
2773 return -EINVAL;
2774 if (count == 0 || count > PAGE_SIZE)
2775 return -EINVAL;
2776
2777 data = memdup_user_nul(buf, count);
2778 if (IS_ERR(data))
2779 return PTR_ERR(data);
2780
2781 rc = smk_parse_label_list(data, &list_tmp);
2782 kfree(data);
2783
2784 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2785 struct cred *new;
2786 struct task_smack *tsp;
2787
2788 new = prepare_creds();
2789 if (!new) {
2790 rc = -ENOMEM;
2791 goto out;
2792 }
2793 tsp = smack_cred(new);
2794 smk_destroy_label_list(&tsp->smk_relabel);
2795 list_splice(&list_tmp, &tsp->smk_relabel);
2796 commit_creds(new);
2797 return count;
2798 }
2799out:
2800 smk_destroy_label_list(&list_tmp);
2801 return rc;
2802}
2803
2804static const struct file_operations smk_relabel_self_ops = {
2805 .open = smk_open_relabel_self,
2806 .read = seq_read,
2807 .llseek = seq_lseek,
2808 .write = smk_write_relabel_self,
2809 .release = seq_release,
2810};
2811
2812/**
2813 * smk_read_ptrace - read() for /smack/ptrace
2814 * @filp: file pointer, not actually used
2815 * @buf: where to put the result
2816 * @count: maximum to send along
2817 * @ppos: where to start
2818 *
2819 * Returns number of bytes read or error code, as appropriate
2820 */
2821static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2822 size_t count, loff_t *ppos)
2823{
2824 char temp[32];
2825 ssize_t rc;
2826
2827 if (*ppos != 0)
2828 return 0;
2829
2830 sprintf(temp, "%d\n", smack_ptrace_rule);
2831 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2832 return rc;
2833}
2834
2835/**
2836 * smk_write_ptrace - write() for /smack/ptrace
2837 * @file: file pointer
2838 * @buf: data from user space
2839 * @count: bytes sent
2840 * @ppos: where to start - must be 0
2841 */
2842static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2843 size_t count, loff_t *ppos)
2844{
2845 char temp[32];
2846 int i;
2847
2848 if (!smack_privileged(CAP_MAC_ADMIN))
2849 return -EPERM;
2850
2851 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2852 return -EINVAL;
2853
2854 if (copy_from_user(temp, buf, count) != 0)
2855 return -EFAULT;
2856
2857 temp[count] = '\0';
2858
2859 if (sscanf(temp, "%d", &i) != 1)
2860 return -EINVAL;
2861 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2862 return -EINVAL;
2863 smack_ptrace_rule = i;
2864
2865 return count;
2866}
2867
2868static const struct file_operations smk_ptrace_ops = {
2869 .write = smk_write_ptrace,
2870 .read = smk_read_ptrace,
2871 .llseek = default_llseek,
2872};
2873
2874/**
2875 * smk_fill_super - fill the smackfs superblock
2876 * @sb: the empty superblock
2877 * @fc: unused
2878 *
2879 * Fill in the well known entries for the smack filesystem
2880 *
2881 * Returns 0 on success, an error code on failure
2882 */
2883static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2884{
2885 int rc;
2886
2887 static const struct tree_descr smack_files[] = {
2888 [SMK_LOAD] = {
2889 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2890 [SMK_CIPSO] = {
2891 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2892 [SMK_DOI] = {
2893 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2894 [SMK_DIRECT] = {
2895 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2896 [SMK_AMBIENT] = {
2897 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2898 [SMK_NET4ADDR] = {
2899 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2900 [SMK_ONLYCAP] = {
2901 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2902 [SMK_LOGGING] = {
2903 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2904 [SMK_LOAD_SELF] = {
2905 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2906 [SMK_ACCESSES] = {
2907 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2908 [SMK_MAPPED] = {
2909 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2910 [SMK_LOAD2] = {
2911 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2912 [SMK_LOAD_SELF2] = {
2913 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2914 [SMK_ACCESS2] = {
2915 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2916 [SMK_CIPSO2] = {
2917 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2918 [SMK_REVOKE_SUBJ] = {
2919 "revoke-subject", &smk_revoke_subj_ops,
2920 S_IRUGO|S_IWUSR},
2921 [SMK_CHANGE_RULE] = {
2922 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2923 [SMK_SYSLOG] = {
2924 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2925 [SMK_PTRACE] = {
2926 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2927#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2928 [SMK_UNCONFINED] = {
2929 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2930#endif
2931#if IS_ENABLED(CONFIG_IPV6)
2932 [SMK_NET6ADDR] = {
2933 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2934#endif /* CONFIG_IPV6 */
2935 [SMK_RELABEL_SELF] = {
2936 "relabel-self", &smk_relabel_self_ops,
2937 S_IRUGO|S_IWUGO},
2938 /* last one */
2939 {""}
2940 };
2941
2942 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2943 if (rc != 0) {
2944 printk(KERN_ERR "%s failed %d while creating inodes\n",
2945 __func__, rc);
2946 return rc;
2947 }
2948
2949 return 0;
2950}
2951
2952/**
2953 * smk_get_tree - get the smackfs superblock
2954 * @fc: The mount context, including any options
2955 *
2956 * Just passes everything along.
2957 *
2958 * Returns what the lower level code does.
2959 */
2960static int smk_get_tree(struct fs_context *fc)
2961{
2962 return get_tree_single(fc, smk_fill_super);
2963}
2964
2965static const struct fs_context_operations smk_context_ops = {
2966 .get_tree = smk_get_tree,
2967};
2968
2969/**
2970 * smk_init_fs_context - Initialise a filesystem context for smackfs
2971 * @fc: The blank mount context
2972 */
2973static int smk_init_fs_context(struct fs_context *fc)
2974{
2975 fc->ops = &smk_context_ops;
2976 return 0;
2977}
2978
2979static struct file_system_type smk_fs_type = {
2980 .name = "smackfs",
2981 .init_fs_context = smk_init_fs_context,
2982 .kill_sb = kill_litter_super,
2983};
2984
2985static struct vfsmount *smackfs_mount;
2986
2987/**
2988 * init_smk_fs - get the smackfs superblock
2989 *
2990 * register the smackfs
2991 *
2992 * Do not register smackfs if Smack wasn't enabled
2993 * on boot. We can not put this method normally under the
2994 * smack_init() code path since the security subsystem get
2995 * initialized before the vfs caches.
2996 *
2997 * Returns true if we were not chosen on boot or if
2998 * we were chosen and filesystem registration succeeded.
2999 */
3000static int __init init_smk_fs(void)
3001{
3002 int err;
3003 int rc;
3004
3005 if (smack_enabled == 0)
3006 return 0;
3007
3008 err = smk_init_sysfs();
3009 if (err)
3010 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3011
3012 err = register_filesystem(&smk_fs_type);
3013 if (!err) {
3014 smackfs_mount = kern_mount(&smk_fs_type);
3015 if (IS_ERR(smackfs_mount)) {
3016 printk(KERN_ERR "smackfs: could not mount!\n");
3017 err = PTR_ERR(smackfs_mount);
3018 smackfs_mount = NULL;
3019 }
3020 }
3021
3022 smk_cipso_doi();
3023 smk_unlbl_ambient(NULL);
3024
3025 rc = smack_populate_secattr(&smack_known_floor);
3026 if (err == 0 && rc < 0)
3027 err = rc;
3028 rc = smack_populate_secattr(&smack_known_hat);
3029 if (err == 0 && rc < 0)
3030 err = rc;
3031 rc = smack_populate_secattr(&smack_known_huh);
3032 if (err == 0 && rc < 0)
3033 err = rc;
3034 rc = smack_populate_secattr(&smack_known_star);
3035 if (err == 0 && rc < 0)
3036 err = rc;
3037 rc = smack_populate_secattr(&smack_known_web);
3038 if (err == 0 && rc < 0)
3039 err = rc;
3040
3041 return err;
3042}
3043
3044__initcall(init_smk_fs);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
4 *
5 * Authors:
6 * Casey Schaufler <casey@schaufler-ca.com>
7 * Ahmed S. Darwish <darwish.07@gmail.com>
8 *
9 * Special thanks to the authors of selinuxfs.
10 *
11 * Karl MacMillan <kmacmillan@tresys.com>
12 * James Morris <jmorris@redhat.com>
13 */
14
15#include <linux/kernel.h>
16#include <linux/vmalloc.h>
17#include <linux/security.h>
18#include <linux/mutex.h>
19#include <linux/slab.h>
20#include <net/net_namespace.h>
21#include <net/cipso_ipv4.h>
22#include <linux/seq_file.h>
23#include <linux/ctype.h>
24#include <linux/audit.h>
25#include <linux/magic.h>
26#include <linux/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 struct smack_known *skp = smk_of_current();
186
187 nap->loginuid = audit_get_loginuid(current);
188 nap->sessionid = audit_get_sessionid(current);
189 nap->secid = skp->smk_secid;
190}
191
192/*
193 * Value for parsing single label host rules
194 * "1.2.3.4 X"
195 */
196#define SMK_NETLBLADDRMIN 9
197
198/**
199 * smk_set_access - add a rule to the rule list or replace an old rule
200 * @srp: the rule to add or replace
201 * @rule_list: the list of rules
202 * @rule_lock: the rule list lock
203 *
204 * Looks through the current subject/object/access list for
205 * the subject/object pair and replaces the access that was
206 * there. If the pair isn't found add it with the specified
207 * access.
208 *
209 * Returns 0 if nothing goes wrong or -ENOMEM if it fails
210 * during the allocation of the new pair to add.
211 */
212static int smk_set_access(struct smack_parsed_rule *srp,
213 struct list_head *rule_list,
214 struct mutex *rule_lock)
215{
216 struct smack_rule *sp;
217 int found = 0;
218 int rc = 0;
219
220 mutex_lock(rule_lock);
221
222 /*
223 * Because the object label is less likely to match
224 * than the subject label check it first
225 */
226 list_for_each_entry_rcu(sp, rule_list, list) {
227 if (sp->smk_object == srp->smk_object &&
228 sp->smk_subject == srp->smk_subject) {
229 found = 1;
230 sp->smk_access |= srp->smk_access1;
231 sp->smk_access &= ~srp->smk_access2;
232 break;
233 }
234 }
235
236 if (found == 0) {
237 sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL);
238 if (sp == NULL) {
239 rc = -ENOMEM;
240 goto out;
241 }
242
243 sp->smk_subject = srp->smk_subject;
244 sp->smk_object = srp->smk_object;
245 sp->smk_access = srp->smk_access1 & ~srp->smk_access2;
246
247 list_add_rcu(&sp->list, rule_list);
248 }
249
250out:
251 mutex_unlock(rule_lock);
252 return rc;
253}
254
255/**
256 * smk_perm_from_str - parse smack accesses from a text string
257 * @string: a text string that contains a Smack accesses code
258 *
259 * Returns an integer with respective bits set for specified accesses.
260 */
261static int smk_perm_from_str(const char *string)
262{
263 int perm = 0;
264 const char *cp;
265
266 for (cp = string; ; cp++)
267 switch (*cp) {
268 case '-':
269 break;
270 case 'r':
271 case 'R':
272 perm |= MAY_READ;
273 break;
274 case 'w':
275 case 'W':
276 perm |= MAY_WRITE;
277 break;
278 case 'x':
279 case 'X':
280 perm |= MAY_EXEC;
281 break;
282 case 'a':
283 case 'A':
284 perm |= MAY_APPEND;
285 break;
286 case 't':
287 case 'T':
288 perm |= MAY_TRANSMUTE;
289 break;
290 case 'l':
291 case 'L':
292 perm |= MAY_LOCK;
293 break;
294 case 'b':
295 case 'B':
296 perm |= MAY_BRINGUP;
297 break;
298 default:
299 return perm;
300 }
301}
302
303/**
304 * smk_fill_rule - Fill Smack rule from strings
305 * @subject: subject label string
306 * @object: object label string
307 * @access1: access string
308 * @access2: string with permissions to be removed
309 * @rule: Smack rule
310 * @import: if non-zero, import labels
311 * @len: label length limit
312 *
313 * Returns 0 on success, appropriate error code on failure.
314 */
315static int smk_fill_rule(const char *subject, const char *object,
316 const char *access1, const char *access2,
317 struct smack_parsed_rule *rule, int import,
318 int len)
319{
320 const char *cp;
321 struct smack_known *skp;
322
323 if (import) {
324 rule->smk_subject = smk_import_entry(subject, len);
325 if (IS_ERR(rule->smk_subject))
326 return PTR_ERR(rule->smk_subject);
327
328 rule->smk_object = smk_import_entry(object, len);
329 if (IS_ERR(rule->smk_object))
330 return PTR_ERR(rule->smk_object);
331 } else {
332 cp = smk_parse_smack(subject, len);
333 if (IS_ERR(cp))
334 return PTR_ERR(cp);
335 skp = smk_find_entry(cp);
336 kfree(cp);
337 if (skp == NULL)
338 return -ENOENT;
339 rule->smk_subject = skp;
340
341 cp = smk_parse_smack(object, len);
342 if (IS_ERR(cp))
343 return PTR_ERR(cp);
344 skp = smk_find_entry(cp);
345 kfree(cp);
346 if (skp == NULL)
347 return -ENOENT;
348 rule->smk_object = skp;
349 }
350
351 rule->smk_access1 = smk_perm_from_str(access1);
352 if (access2)
353 rule->smk_access2 = smk_perm_from_str(access2);
354 else
355 rule->smk_access2 = ~rule->smk_access1;
356
357 return 0;
358}
359
360/**
361 * smk_parse_rule - parse Smack rule from load string
362 * @data: string to be parsed whose size is SMK_LOADLEN
363 * @rule: Smack rule
364 * @import: if non-zero, import labels
365 *
366 * Returns 0 on success, -1 on errors.
367 */
368static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule,
369 int import)
370{
371 int rc;
372
373 rc = smk_fill_rule(data, data + SMK_LABELLEN,
374 data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule,
375 import, SMK_LABELLEN);
376 return rc;
377}
378
379/**
380 * smk_parse_long_rule - parse Smack rule from rule string
381 * @data: string to be parsed, null terminated
382 * @rule: Will be filled with Smack parsed rule
383 * @import: if non-zero, import labels
384 * @tokens: number of substrings expected in data
385 *
386 * Returns number of processed bytes on success, -ERRNO on failure.
387 */
388static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule,
389 int import, int tokens)
390{
391 ssize_t cnt = 0;
392 char *tok[4];
393 int rc;
394 int i;
395
396 /*
397 * Parsing the rule in-place, filling all white-spaces with '\0'
398 */
399 for (i = 0; i < tokens; ++i) {
400 while (isspace(data[cnt]))
401 data[cnt++] = '\0';
402
403 if (data[cnt] == '\0')
404 /* Unexpected end of data */
405 return -EINVAL;
406
407 tok[i] = data + cnt;
408
409 while (data[cnt] && !isspace(data[cnt]))
410 ++cnt;
411 }
412 while (isspace(data[cnt]))
413 data[cnt++] = '\0';
414
415 while (i < 4)
416 tok[i++] = NULL;
417
418 rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0);
419 return rc == 0 ? cnt : rc;
420}
421
422#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */
423#define SMK_LONG_FMT 1 /* Variable long label format */
424#define SMK_CHANGE_FMT 2 /* Rule modification format */
425/**
426 * smk_write_rules_list - write() for any /smack rule file
427 * @file: file pointer, not actually used
428 * @buf: where to get the data from
429 * @count: bytes sent
430 * @ppos: where to start - must be 0
431 * @rule_list: the list of rules to write to
432 * @rule_lock: lock for the rule list
433 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
434 *
435 * Get one smack access rule from above.
436 * The format for SMK_LONG_FMT is:
437 * "subject<whitespace>object<whitespace>access[<whitespace>...]"
438 * The format for SMK_FIXED24_FMT is exactly:
439 * "subject object rwxat"
440 * The format for SMK_CHANGE_FMT is:
441 * "subject<whitespace>object<whitespace>
442 * acc_enable<whitespace>acc_disable[<whitespace>...]"
443 */
444static ssize_t smk_write_rules_list(struct file *file, const char __user *buf,
445 size_t count, loff_t *ppos,
446 struct list_head *rule_list,
447 struct mutex *rule_lock, int format)
448{
449 struct smack_parsed_rule rule;
450 char *data;
451 int rc;
452 int trunc = 0;
453 int tokens;
454 ssize_t cnt = 0;
455
456 /*
457 * No partial writes.
458 * Enough data must be present.
459 */
460 if (*ppos != 0)
461 return -EINVAL;
462
463 if (format == SMK_FIXED24_FMT) {
464 /*
465 * Minor hack for backward compatibility
466 */
467 if (count < SMK_OLOADLEN || count > SMK_LOADLEN)
468 return -EINVAL;
469 } else {
470 if (count >= PAGE_SIZE) {
471 count = PAGE_SIZE - 1;
472 trunc = 1;
473 }
474 }
475
476 data = memdup_user_nul(buf, count);
477 if (IS_ERR(data))
478 return PTR_ERR(data);
479
480 /*
481 * In case of parsing only part of user buf,
482 * avoid having partial rule at the data buffer
483 */
484 if (trunc) {
485 while (count > 0 && (data[count - 1] != '\n'))
486 --count;
487 if (count == 0) {
488 rc = -EINVAL;
489 goto out;
490 }
491 }
492
493 data[count] = '\0';
494 tokens = (format == SMK_CHANGE_FMT ? 4 : 3);
495 while (cnt < count) {
496 if (format == SMK_FIXED24_FMT) {
497 rc = smk_parse_rule(data, &rule, 1);
498 if (rc < 0)
499 goto out;
500 cnt = count;
501 } else {
502 rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens);
503 if (rc < 0)
504 goto out;
505 if (rc == 0) {
506 rc = -EINVAL;
507 goto out;
508 }
509 cnt += rc;
510 }
511
512 if (rule_list == NULL)
513 rc = smk_set_access(&rule, &rule.smk_subject->smk_rules,
514 &rule.smk_subject->smk_rules_lock);
515 else
516 rc = smk_set_access(&rule, rule_list, rule_lock);
517
518 if (rc)
519 goto out;
520 }
521
522 rc = cnt;
523out:
524 kfree(data);
525 return rc;
526}
527
528/*
529 * Core logic for smackfs seq list operations.
530 */
531
532static void *smk_seq_start(struct seq_file *s, loff_t *pos,
533 struct list_head *head)
534{
535 struct list_head *list;
536 int i = *pos;
537
538 rcu_read_lock();
539 for (list = rcu_dereference(list_next_rcu(head));
540 list != head;
541 list = rcu_dereference(list_next_rcu(list))) {
542 if (i-- == 0)
543 return list;
544 }
545
546 return NULL;
547}
548
549static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos,
550 struct list_head *head)
551{
552 struct list_head *list = v;
553
554 ++*pos;
555 list = rcu_dereference(list_next_rcu(list));
556
557 return (list == head) ? NULL : list;
558}
559
560static void smk_seq_stop(struct seq_file *s, void *v)
561{
562 rcu_read_unlock();
563}
564
565static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max)
566{
567 /*
568 * Don't show any rules with label names too long for
569 * interface file (/smack/load or /smack/load2)
570 * because you should expect to be able to write
571 * anything you read back.
572 */
573 if (strlen(srp->smk_subject->smk_known) >= max ||
574 strlen(srp->smk_object->smk_known) >= max)
575 return;
576
577 if (srp->smk_access == 0)
578 return;
579
580 seq_printf(s, "%s %s",
581 srp->smk_subject->smk_known,
582 srp->smk_object->smk_known);
583
584 seq_putc(s, ' ');
585
586 if (srp->smk_access & MAY_READ)
587 seq_putc(s, 'r');
588 if (srp->smk_access & MAY_WRITE)
589 seq_putc(s, 'w');
590 if (srp->smk_access & MAY_EXEC)
591 seq_putc(s, 'x');
592 if (srp->smk_access & MAY_APPEND)
593 seq_putc(s, 'a');
594 if (srp->smk_access & MAY_TRANSMUTE)
595 seq_putc(s, 't');
596 if (srp->smk_access & MAY_LOCK)
597 seq_putc(s, 'l');
598 if (srp->smk_access & MAY_BRINGUP)
599 seq_putc(s, 'b');
600
601 seq_putc(s, '\n');
602}
603
604/*
605 * Seq_file read operations for /smack/load
606 */
607
608static void *load2_seq_start(struct seq_file *s, loff_t *pos)
609{
610 return smk_seq_start(s, pos, &smack_known_list);
611}
612
613static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos)
614{
615 return smk_seq_next(s, v, pos, &smack_known_list);
616}
617
618static int load_seq_show(struct seq_file *s, void *v)
619{
620 struct list_head *list = v;
621 struct smack_rule *srp;
622 struct smack_known *skp =
623 list_entry_rcu(list, struct smack_known, list);
624
625 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
626 smk_rule_show(s, srp, SMK_LABELLEN);
627
628 return 0;
629}
630
631static const struct seq_operations load_seq_ops = {
632 .start = load2_seq_start,
633 .next = load2_seq_next,
634 .show = load_seq_show,
635 .stop = smk_seq_stop,
636};
637
638/**
639 * smk_open_load - open() for /smack/load
640 * @inode: inode structure representing file
641 * @file: "load" file pointer
642 *
643 * For reading, use load_seq_* seq_file reading operations.
644 */
645static int smk_open_load(struct inode *inode, struct file *file)
646{
647 return seq_open(file, &load_seq_ops);
648}
649
650/**
651 * smk_write_load - write() for /smack/load
652 * @file: file pointer, not actually used
653 * @buf: where to get the data from
654 * @count: bytes sent
655 * @ppos: where to start - must be 0
656 *
657 */
658static ssize_t smk_write_load(struct file *file, const char __user *buf,
659 size_t count, loff_t *ppos)
660{
661 /*
662 * Must have privilege.
663 * No partial writes.
664 * Enough data must be present.
665 */
666 if (!smack_privileged(CAP_MAC_ADMIN))
667 return -EPERM;
668
669 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
670 SMK_FIXED24_FMT);
671}
672
673static const struct file_operations smk_load_ops = {
674 .open = smk_open_load,
675 .read = seq_read,
676 .llseek = seq_lseek,
677 .write = smk_write_load,
678 .release = seq_release,
679};
680
681/**
682 * smk_cipso_doi - initialize the CIPSO domain
683 */
684static void smk_cipso_doi(void)
685{
686 int rc;
687 struct cipso_v4_doi *doip;
688 struct netlbl_audit nai;
689
690 smk_netlabel_audit_set(&nai);
691
692 rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai);
693 if (rc != 0)
694 printk(KERN_WARNING "%s:%d remove rc = %d\n",
695 __func__, __LINE__, rc);
696
697 doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL | __GFP_NOFAIL);
698 doip->map.std = NULL;
699 doip->doi = smk_cipso_doi_value;
700 doip->type = CIPSO_V4_MAP_PASS;
701 doip->tags[0] = CIPSO_V4_TAG_RBITMAP;
702 for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++)
703 doip->tags[rc] = CIPSO_V4_TAG_INVALID;
704
705 rc = netlbl_cfg_cipsov4_add(doip, &nai);
706 if (rc != 0) {
707 printk(KERN_WARNING "%s:%d cipso add rc = %d\n",
708 __func__, __LINE__, rc);
709 kfree(doip);
710 return;
711 }
712 rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai);
713 if (rc != 0) {
714 printk(KERN_WARNING "%s:%d map add rc = %d\n",
715 __func__, __LINE__, rc);
716 netlbl_cfg_cipsov4_del(doip->doi, &nai);
717 return;
718 }
719}
720
721/**
722 * smk_unlbl_ambient - initialize the unlabeled domain
723 * @oldambient: previous domain string
724 */
725static void smk_unlbl_ambient(char *oldambient)
726{
727 int rc;
728 struct netlbl_audit nai;
729
730 smk_netlabel_audit_set(&nai);
731
732 if (oldambient != NULL) {
733 rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai);
734 if (rc != 0)
735 printk(KERN_WARNING "%s:%d remove rc = %d\n",
736 __func__, __LINE__, rc);
737 }
738 if (smack_net_ambient == NULL)
739 smack_net_ambient = &smack_known_floor;
740
741 rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET,
742 NULL, NULL, &nai);
743 if (rc != 0)
744 printk(KERN_WARNING "%s:%d add rc = %d\n",
745 __func__, __LINE__, rc);
746}
747
748/*
749 * Seq_file read operations for /smack/cipso
750 */
751
752static void *cipso_seq_start(struct seq_file *s, loff_t *pos)
753{
754 return smk_seq_start(s, pos, &smack_known_list);
755}
756
757static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos)
758{
759 return smk_seq_next(s, v, pos, &smack_known_list);
760}
761
762/*
763 * Print cipso labels in format:
764 * label level[/cat[,cat]]
765 */
766static int cipso_seq_show(struct seq_file *s, void *v)
767{
768 struct list_head *list = v;
769 struct smack_known *skp =
770 list_entry_rcu(list, struct smack_known, list);
771 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
772 char sep = '/';
773 int i;
774
775 /*
776 * Don't show a label that could not have been set using
777 * /smack/cipso. This is in support of the notion that
778 * anything read from /smack/cipso ought to be writeable
779 * to /smack/cipso.
780 *
781 * /smack/cipso2 should be used instead.
782 */
783 if (strlen(skp->smk_known) >= SMK_LABELLEN)
784 return 0;
785
786 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
787
788 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
789 i = netlbl_catmap_walk(cmp, i + 1)) {
790 seq_printf(s, "%c%d", sep, i);
791 sep = ',';
792 }
793
794 seq_putc(s, '\n');
795
796 return 0;
797}
798
799static const struct seq_operations cipso_seq_ops = {
800 .start = cipso_seq_start,
801 .next = cipso_seq_next,
802 .show = cipso_seq_show,
803 .stop = smk_seq_stop,
804};
805
806/**
807 * smk_open_cipso - open() for /smack/cipso
808 * @inode: inode structure representing file
809 * @file: "cipso" file pointer
810 *
811 * Connect our cipso_seq_* operations with /smack/cipso
812 * file_operations
813 */
814static int smk_open_cipso(struct inode *inode, struct file *file)
815{
816 return seq_open(file, &cipso_seq_ops);
817}
818
819/**
820 * smk_set_cipso - do the work for write() for cipso and cipso2
821 * @file: file pointer, not actually used
822 * @buf: where to get the data from
823 * @count: bytes sent
824 * @ppos: where to start
825 * @format: /smack/cipso or /smack/cipso2
826 *
827 * Accepts only one cipso rule per write call.
828 * Returns number of bytes written or error code, as appropriate
829 */
830static ssize_t smk_set_cipso(struct file *file, const char __user *buf,
831 size_t count, loff_t *ppos, int format)
832{
833 struct netlbl_lsm_catmap *old_cat, *new_cat = NULL;
834 struct smack_known *skp;
835 struct netlbl_lsm_secattr ncats;
836 char mapcatset[SMK_CIPSOLEN];
837 int maplevel;
838 unsigned int cat;
839 int catlen;
840 ssize_t rc = -EINVAL;
841 char *data = NULL;
842 char *rule;
843 int ret;
844 int i;
845
846 /*
847 * Must have privilege.
848 * No partial writes.
849 * Enough data must be present.
850 */
851 if (!smack_privileged(CAP_MAC_ADMIN))
852 return -EPERM;
853 if (*ppos != 0)
854 return -EINVAL;
855 if (format == SMK_FIXED24_FMT &&
856 (count < SMK_CIPSOMIN || count > SMK_CIPSOMAX))
857 return -EINVAL;
858 if (count > PAGE_SIZE)
859 return -EINVAL;
860
861 data = memdup_user_nul(buf, count);
862 if (IS_ERR(data))
863 return PTR_ERR(data);
864
865 rule = data;
866 /*
867 * Only allow one writer at a time. Writes should be
868 * quite rare and small in any case.
869 */
870 mutex_lock(&smack_cipso_lock);
871
872 skp = smk_import_entry(rule, 0);
873 if (IS_ERR(skp)) {
874 rc = PTR_ERR(skp);
875 goto out;
876 }
877
878 if (format == SMK_FIXED24_FMT)
879 rule += SMK_LABELLEN;
880 else
881 rule += strlen(skp->smk_known) + 1;
882
883 if (rule > data + count) {
884 rc = -EOVERFLOW;
885 goto out;
886 }
887
888 ret = sscanf(rule, "%d", &maplevel);
889 if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL)
890 goto out;
891
892 rule += SMK_DIGITLEN;
893 if (rule > data + count) {
894 rc = -EOVERFLOW;
895 goto out;
896 }
897
898 ret = sscanf(rule, "%d", &catlen);
899 if (ret != 1 || catlen < 0 || catlen > SMACK_CIPSO_MAXCATNUM)
900 goto out;
901
902 if (format == SMK_FIXED24_FMT &&
903 count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN))
904 goto out;
905
906 memset(mapcatset, 0, sizeof(mapcatset));
907
908 for (i = 0; i < catlen; i++) {
909 rule += SMK_DIGITLEN;
910 if (rule > data + count) {
911 rc = -EOVERFLOW;
912 goto out;
913 }
914 ret = sscanf(rule, "%u", &cat);
915 if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM)
916 goto out;
917
918 smack_catset_bit(cat, mapcatset);
919 }
920 ncats.flags = 0;
921 if (catlen == 0) {
922 ncats.attr.mls.cat = NULL;
923 ncats.attr.mls.lvl = maplevel;
924 new_cat = netlbl_catmap_alloc(GFP_ATOMIC);
925 if (new_cat)
926 new_cat->next = ncats.attr.mls.cat;
927 ncats.attr.mls.cat = new_cat;
928 skp->smk_netlabel.flags &= ~(1U << 3);
929 rc = 0;
930 } else {
931 rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN);
932 }
933 if (rc >= 0) {
934 old_cat = skp->smk_netlabel.attr.mls.cat;
935 skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat;
936 skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl;
937 synchronize_rcu();
938 netlbl_catmap_free(old_cat);
939 rc = count;
940 /*
941 * This mapping may have been cached, so clear the cache.
942 */
943 netlbl_cache_invalidate();
944 }
945
946out:
947 mutex_unlock(&smack_cipso_lock);
948 kfree(data);
949 return rc;
950}
951
952/**
953 * smk_write_cipso - write() for /smack/cipso
954 * @file: file pointer, not actually used
955 * @buf: where to get the data from
956 * @count: bytes sent
957 * @ppos: where to start
958 *
959 * Accepts only one cipso rule per write call.
960 * Returns number of bytes written or error code, as appropriate
961 */
962static ssize_t smk_write_cipso(struct file *file, const char __user *buf,
963 size_t count, loff_t *ppos)
964{
965 return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT);
966}
967
968static const struct file_operations smk_cipso_ops = {
969 .open = smk_open_cipso,
970 .read = seq_read,
971 .llseek = seq_lseek,
972 .write = smk_write_cipso,
973 .release = seq_release,
974};
975
976/*
977 * Seq_file read operations for /smack/cipso2
978 */
979
980/*
981 * Print cipso labels in format:
982 * label level[/cat[,cat]]
983 */
984static int cipso2_seq_show(struct seq_file *s, void *v)
985{
986 struct list_head *list = v;
987 struct smack_known *skp =
988 list_entry_rcu(list, struct smack_known, list);
989 struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat;
990 char sep = '/';
991 int i;
992
993 seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl);
994
995 for (i = netlbl_catmap_walk(cmp, 0); i >= 0;
996 i = netlbl_catmap_walk(cmp, i + 1)) {
997 seq_printf(s, "%c%d", sep, i);
998 sep = ',';
999 }
1000
1001 seq_putc(s, '\n');
1002
1003 return 0;
1004}
1005
1006static const struct seq_operations cipso2_seq_ops = {
1007 .start = cipso_seq_start,
1008 .next = cipso_seq_next,
1009 .show = cipso2_seq_show,
1010 .stop = smk_seq_stop,
1011};
1012
1013/**
1014 * smk_open_cipso2 - open() for /smack/cipso2
1015 * @inode: inode structure representing file
1016 * @file: "cipso2" file pointer
1017 *
1018 * Connect our cipso_seq_* operations with /smack/cipso2
1019 * file_operations
1020 */
1021static int smk_open_cipso2(struct inode *inode, struct file *file)
1022{
1023 return seq_open(file, &cipso2_seq_ops);
1024}
1025
1026/**
1027 * smk_write_cipso2 - write() for /smack/cipso2
1028 * @file: file pointer, not actually used
1029 * @buf: where to get the data from
1030 * @count: bytes sent
1031 * @ppos: where to start
1032 *
1033 * Accepts only one cipso rule per write call.
1034 * Returns number of bytes written or error code, as appropriate
1035 */
1036static ssize_t smk_write_cipso2(struct file *file, const char __user *buf,
1037 size_t count, loff_t *ppos)
1038{
1039 return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT);
1040}
1041
1042static const struct file_operations smk_cipso2_ops = {
1043 .open = smk_open_cipso2,
1044 .read = seq_read,
1045 .llseek = seq_lseek,
1046 .write = smk_write_cipso2,
1047 .release = seq_release,
1048};
1049
1050/*
1051 * Seq_file read operations for /smack/netlabel
1052 */
1053
1054static void *net4addr_seq_start(struct seq_file *s, loff_t *pos)
1055{
1056 return smk_seq_start(s, pos, &smk_net4addr_list);
1057}
1058
1059static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1060{
1061 return smk_seq_next(s, v, pos, &smk_net4addr_list);
1062}
1063
1064/*
1065 * Print host/label pairs
1066 */
1067static int net4addr_seq_show(struct seq_file *s, void *v)
1068{
1069 struct list_head *list = v;
1070 struct smk_net4addr *skp =
1071 list_entry_rcu(list, struct smk_net4addr, list);
1072 char *kp = SMACK_CIPSO_OPTION;
1073
1074 if (skp->smk_label != NULL)
1075 kp = skp->smk_label->smk_known;
1076 seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr,
1077 skp->smk_masks, kp);
1078
1079 return 0;
1080}
1081
1082static const struct seq_operations net4addr_seq_ops = {
1083 .start = net4addr_seq_start,
1084 .next = net4addr_seq_next,
1085 .show = net4addr_seq_show,
1086 .stop = smk_seq_stop,
1087};
1088
1089/**
1090 * smk_open_net4addr - open() for /smack/netlabel
1091 * @inode: inode structure representing file
1092 * @file: "netlabel" file pointer
1093 *
1094 * Connect our net4addr_seq_* operations with /smack/netlabel
1095 * file_operations
1096 */
1097static int smk_open_net4addr(struct inode *inode, struct file *file)
1098{
1099 return seq_open(file, &net4addr_seq_ops);
1100}
1101
1102/**
1103 * smk_net4addr_insert
1104 * @new : netlabel to insert
1105 *
1106 * This helper insert netlabel in the smack_net4addrs list
1107 * sorted by netmask length (longest to smallest)
1108 * locked by &smk_net4addr_lock in smk_write_net4addr
1109 *
1110 */
1111static void smk_net4addr_insert(struct smk_net4addr *new)
1112{
1113 struct smk_net4addr *m;
1114 struct smk_net4addr *m_next;
1115
1116 if (list_empty(&smk_net4addr_list)) {
1117 list_add_rcu(&new->list, &smk_net4addr_list);
1118 return;
1119 }
1120
1121 m = list_entry_rcu(smk_net4addr_list.next,
1122 struct smk_net4addr, list);
1123
1124 /* the comparison '>' is a bit hacky, but works */
1125 if (new->smk_masks > m->smk_masks) {
1126 list_add_rcu(&new->list, &smk_net4addr_list);
1127 return;
1128 }
1129
1130 list_for_each_entry_rcu(m, &smk_net4addr_list, list) {
1131 if (list_is_last(&m->list, &smk_net4addr_list)) {
1132 list_add_rcu(&new->list, &m->list);
1133 return;
1134 }
1135 m_next = list_entry_rcu(m->list.next,
1136 struct smk_net4addr, list);
1137 if (new->smk_masks > m_next->smk_masks) {
1138 list_add_rcu(&new->list, &m->list);
1139 return;
1140 }
1141 }
1142}
1143
1144
1145/**
1146 * smk_write_net4addr - write() for /smack/netlabel
1147 * @file: file pointer, not actually used
1148 * @buf: where to get the data from
1149 * @count: bytes sent
1150 * @ppos: where to start
1151 *
1152 * Accepts only one net4addr per write call.
1153 * Returns number of bytes written or error code, as appropriate
1154 */
1155static ssize_t smk_write_net4addr(struct file *file, const char __user *buf,
1156 size_t count, loff_t *ppos)
1157{
1158 struct smk_net4addr *snp;
1159 struct sockaddr_in newname;
1160 char *smack;
1161 struct smack_known *skp = NULL;
1162 char *data;
1163 char *host = (char *)&newname.sin_addr.s_addr;
1164 int rc;
1165 struct netlbl_audit audit_info;
1166 struct in_addr mask;
1167 unsigned int m;
1168 unsigned int masks;
1169 int found;
1170 u32 mask_bits = (1<<31);
1171 __be32 nsa;
1172 u32 temp_mask;
1173
1174 /*
1175 * Must have privilege.
1176 * No partial writes.
1177 * Enough data must be present.
1178 * "<addr/mask, as a.b.c.d/e><space><label>"
1179 * "<addr, as a.b.c.d><space><label>"
1180 */
1181 if (!smack_privileged(CAP_MAC_ADMIN))
1182 return -EPERM;
1183 if (*ppos != 0)
1184 return -EINVAL;
1185 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1186 return -EINVAL;
1187
1188 data = memdup_user_nul(buf, count);
1189 if (IS_ERR(data))
1190 return PTR_ERR(data);
1191
1192 smack = kzalloc(count + 1, GFP_KERNEL);
1193 if (smack == NULL) {
1194 rc = -ENOMEM;
1195 goto free_data_out;
1196 }
1197
1198 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s",
1199 &host[0], &host[1], &host[2], &host[3], &masks, smack);
1200 if (rc != 6) {
1201 rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s",
1202 &host[0], &host[1], &host[2], &host[3], smack);
1203 if (rc != 5) {
1204 rc = -EINVAL;
1205 goto free_out;
1206 }
1207 masks = 32;
1208 }
1209 if (masks > BEBITS) {
1210 rc = -EINVAL;
1211 goto free_out;
1212 }
1213
1214 /*
1215 * If smack begins with '-', it is an option, don't import it
1216 */
1217 if (smack[0] != '-') {
1218 skp = smk_import_entry(smack, 0);
1219 if (IS_ERR(skp)) {
1220 rc = PTR_ERR(skp);
1221 goto free_out;
1222 }
1223 } else {
1224 /*
1225 * Only the -CIPSO option is supported for IPv4
1226 */
1227 if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) {
1228 rc = -EINVAL;
1229 goto free_out;
1230 }
1231 }
1232
1233 for (m = masks, temp_mask = 0; m > 0; m--) {
1234 temp_mask |= mask_bits;
1235 mask_bits >>= 1;
1236 }
1237 mask.s_addr = cpu_to_be32(temp_mask);
1238
1239 newname.sin_addr.s_addr &= mask.s_addr;
1240 /*
1241 * Only allow one writer at a time. Writes should be
1242 * quite rare and small in any case.
1243 */
1244 mutex_lock(&smk_net4addr_lock);
1245
1246 nsa = newname.sin_addr.s_addr;
1247 /* try to find if the prefix is already in the list */
1248 found = 0;
1249 list_for_each_entry_rcu(snp, &smk_net4addr_list, list) {
1250 if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) {
1251 found = 1;
1252 break;
1253 }
1254 }
1255 smk_netlabel_audit_set(&audit_info);
1256
1257 if (found == 0) {
1258 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1259 if (snp == NULL)
1260 rc = -ENOMEM;
1261 else {
1262 rc = 0;
1263 snp->smk_host.s_addr = newname.sin_addr.s_addr;
1264 snp->smk_mask.s_addr = mask.s_addr;
1265 snp->smk_label = skp;
1266 snp->smk_masks = masks;
1267 smk_net4addr_insert(snp);
1268 }
1269 } else {
1270 /*
1271 * Delete the unlabeled entry, only if the previous label
1272 * wasn't the special CIPSO option
1273 */
1274 if (snp->smk_label != NULL)
1275 rc = netlbl_cfg_unlbl_static_del(&init_net, NULL,
1276 &snp->smk_host, &snp->smk_mask,
1277 PF_INET, &audit_info);
1278 else
1279 rc = 0;
1280 snp->smk_label = skp;
1281 }
1282
1283 /*
1284 * Now tell netlabel about the single label nature of
1285 * this host so that incoming packets get labeled.
1286 * but only if we didn't get the special CIPSO option
1287 */
1288 if (rc == 0 && skp != NULL)
1289 rc = netlbl_cfg_unlbl_static_add(&init_net, NULL,
1290 &snp->smk_host, &snp->smk_mask, PF_INET,
1291 snp->smk_label->smk_secid, &audit_info);
1292
1293 if (rc == 0)
1294 rc = count;
1295
1296 mutex_unlock(&smk_net4addr_lock);
1297
1298free_out:
1299 kfree(smack);
1300free_data_out:
1301 kfree(data);
1302
1303 return rc;
1304}
1305
1306static const struct file_operations smk_net4addr_ops = {
1307 .open = smk_open_net4addr,
1308 .read = seq_read,
1309 .llseek = seq_lseek,
1310 .write = smk_write_net4addr,
1311 .release = seq_release,
1312};
1313
1314#if IS_ENABLED(CONFIG_IPV6)
1315/*
1316 * Seq_file read operations for /smack/netlabel6
1317 */
1318
1319static void *net6addr_seq_start(struct seq_file *s, loff_t *pos)
1320{
1321 return smk_seq_start(s, pos, &smk_net6addr_list);
1322}
1323
1324static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos)
1325{
1326 return smk_seq_next(s, v, pos, &smk_net6addr_list);
1327}
1328
1329/*
1330 * Print host/label pairs
1331 */
1332static int net6addr_seq_show(struct seq_file *s, void *v)
1333{
1334 struct list_head *list = v;
1335 struct smk_net6addr *skp =
1336 list_entry(list, struct smk_net6addr, list);
1337
1338 if (skp->smk_label != NULL)
1339 seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks,
1340 skp->smk_label->smk_known);
1341
1342 return 0;
1343}
1344
1345static const struct seq_operations net6addr_seq_ops = {
1346 .start = net6addr_seq_start,
1347 .next = net6addr_seq_next,
1348 .show = net6addr_seq_show,
1349 .stop = smk_seq_stop,
1350};
1351
1352/**
1353 * smk_open_net6addr - open() for /smack/netlabel
1354 * @inode: inode structure representing file
1355 * @file: "netlabel" file pointer
1356 *
1357 * Connect our net6addr_seq_* operations with /smack/netlabel
1358 * file_operations
1359 */
1360static int smk_open_net6addr(struct inode *inode, struct file *file)
1361{
1362 return seq_open(file, &net6addr_seq_ops);
1363}
1364
1365/**
1366 * smk_net6addr_insert
1367 * @new : entry to insert
1368 *
1369 * This inserts an entry in the smack_net6addrs list
1370 * sorted by netmask length (longest to smallest)
1371 * locked by &smk_net6addr_lock in smk_write_net6addr
1372 *
1373 */
1374static void smk_net6addr_insert(struct smk_net6addr *new)
1375{
1376 struct smk_net6addr *m_next;
1377 struct smk_net6addr *m;
1378
1379 if (list_empty(&smk_net6addr_list)) {
1380 list_add_rcu(&new->list, &smk_net6addr_list);
1381 return;
1382 }
1383
1384 m = list_entry_rcu(smk_net6addr_list.next,
1385 struct smk_net6addr, list);
1386
1387 if (new->smk_masks > m->smk_masks) {
1388 list_add_rcu(&new->list, &smk_net6addr_list);
1389 return;
1390 }
1391
1392 list_for_each_entry_rcu(m, &smk_net6addr_list, list) {
1393 if (list_is_last(&m->list, &smk_net6addr_list)) {
1394 list_add_rcu(&new->list, &m->list);
1395 return;
1396 }
1397 m_next = list_entry_rcu(m->list.next,
1398 struct smk_net6addr, list);
1399 if (new->smk_masks > m_next->smk_masks) {
1400 list_add_rcu(&new->list, &m->list);
1401 return;
1402 }
1403 }
1404}
1405
1406
1407/**
1408 * smk_write_net6addr - write() for /smack/netlabel
1409 * @file: file pointer, not actually used
1410 * @buf: where to get the data from
1411 * @count: bytes sent
1412 * @ppos: where to start
1413 *
1414 * Accepts only one net6addr per write call.
1415 * Returns number of bytes written or error code, as appropriate
1416 */
1417static ssize_t smk_write_net6addr(struct file *file, const char __user *buf,
1418 size_t count, loff_t *ppos)
1419{
1420 struct smk_net6addr *snp;
1421 struct in6_addr newname;
1422 struct in6_addr fullmask;
1423 struct smack_known *skp = NULL;
1424 char *smack;
1425 char *data;
1426 int rc = 0;
1427 int found = 0;
1428 int i;
1429 unsigned int scanned[8];
1430 unsigned int m;
1431 unsigned int mask = 128;
1432
1433 /*
1434 * Must have privilege.
1435 * No partial writes.
1436 * Enough data must be present.
1437 * "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>"
1438 * "<addr, as a:b:c:d:e:f:g:h><space><label>"
1439 */
1440 if (!smack_privileged(CAP_MAC_ADMIN))
1441 return -EPERM;
1442 if (*ppos != 0)
1443 return -EINVAL;
1444 if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1)
1445 return -EINVAL;
1446
1447 data = memdup_user_nul(buf, count);
1448 if (IS_ERR(data))
1449 return PTR_ERR(data);
1450
1451 smack = kzalloc(count + 1, GFP_KERNEL);
1452 if (smack == NULL) {
1453 rc = -ENOMEM;
1454 goto free_data_out;
1455 }
1456
1457 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s",
1458 &scanned[0], &scanned[1], &scanned[2], &scanned[3],
1459 &scanned[4], &scanned[5], &scanned[6], &scanned[7],
1460 &mask, smack);
1461 if (i != 10) {
1462 i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s",
1463 &scanned[0], &scanned[1], &scanned[2],
1464 &scanned[3], &scanned[4], &scanned[5],
1465 &scanned[6], &scanned[7], smack);
1466 if (i != 9) {
1467 rc = -EINVAL;
1468 goto free_out;
1469 }
1470 }
1471 if (mask > 128) {
1472 rc = -EINVAL;
1473 goto free_out;
1474 }
1475 for (i = 0; i < 8; i++) {
1476 if (scanned[i] > 0xffff) {
1477 rc = -EINVAL;
1478 goto free_out;
1479 }
1480 newname.s6_addr16[i] = htons(scanned[i]);
1481 }
1482
1483 /*
1484 * If smack begins with '-', it is an option, don't import it
1485 */
1486 if (smack[0] != '-') {
1487 skp = smk_import_entry(smack, 0);
1488 if (IS_ERR(skp)) {
1489 rc = PTR_ERR(skp);
1490 goto free_out;
1491 }
1492 } else {
1493 /*
1494 * Only -DELETE is supported for IPv6
1495 */
1496 if (strcmp(smack, SMACK_DELETE_OPTION) != 0) {
1497 rc = -EINVAL;
1498 goto free_out;
1499 }
1500 }
1501
1502 for (i = 0, m = mask; i < 8; i++) {
1503 if (m >= 16) {
1504 fullmask.s6_addr16[i] = 0xffff;
1505 m -= 16;
1506 } else if (m > 0) {
1507 fullmask.s6_addr16[i] = (1 << m) - 1;
1508 m = 0;
1509 } else
1510 fullmask.s6_addr16[i] = 0;
1511 newname.s6_addr16[i] &= fullmask.s6_addr16[i];
1512 }
1513
1514 /*
1515 * Only allow one writer at a time. Writes should be
1516 * quite rare and small in any case.
1517 */
1518 mutex_lock(&smk_net6addr_lock);
1519 /*
1520 * Try to find the prefix in the list
1521 */
1522 list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
1523 if (mask != snp->smk_masks)
1524 continue;
1525 for (found = 1, i = 0; i < 8; i++) {
1526 if (newname.s6_addr16[i] !=
1527 snp->smk_host.s6_addr16[i]) {
1528 found = 0;
1529 break;
1530 }
1531 }
1532 if (found == 1)
1533 break;
1534 }
1535 if (found == 0) {
1536 snp = kzalloc(sizeof(*snp), GFP_KERNEL);
1537 if (snp == NULL)
1538 rc = -ENOMEM;
1539 else {
1540 snp->smk_host = newname;
1541 snp->smk_mask = fullmask;
1542 snp->smk_masks = mask;
1543 snp->smk_label = skp;
1544 smk_net6addr_insert(snp);
1545 }
1546 } else {
1547 snp->smk_label = skp;
1548 }
1549
1550 if (rc == 0)
1551 rc = count;
1552
1553 mutex_unlock(&smk_net6addr_lock);
1554
1555free_out:
1556 kfree(smack);
1557free_data_out:
1558 kfree(data);
1559
1560 return rc;
1561}
1562
1563static const struct file_operations smk_net6addr_ops = {
1564 .open = smk_open_net6addr,
1565 .read = seq_read,
1566 .llseek = seq_lseek,
1567 .write = smk_write_net6addr,
1568 .release = seq_release,
1569};
1570#endif /* CONFIG_IPV6 */
1571
1572/**
1573 * smk_read_doi - read() for /smack/doi
1574 * @filp: file pointer, not actually used
1575 * @buf: where to put the result
1576 * @count: maximum to send along
1577 * @ppos: where to start
1578 *
1579 * Returns number of bytes read or error code, as appropriate
1580 */
1581static ssize_t smk_read_doi(struct file *filp, char __user *buf,
1582 size_t count, loff_t *ppos)
1583{
1584 char temp[80];
1585 ssize_t rc;
1586
1587 if (*ppos != 0)
1588 return 0;
1589
1590 sprintf(temp, "%d", smk_cipso_doi_value);
1591 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1592
1593 return rc;
1594}
1595
1596/**
1597 * smk_write_doi - write() for /smack/doi
1598 * @file: file pointer, not actually used
1599 * @buf: where to get the data from
1600 * @count: bytes sent
1601 * @ppos: where to start
1602 *
1603 * Returns number of bytes written or error code, as appropriate
1604 */
1605static ssize_t smk_write_doi(struct file *file, const char __user *buf,
1606 size_t count, loff_t *ppos)
1607{
1608 char temp[80];
1609 int i;
1610
1611 if (!smack_privileged(CAP_MAC_ADMIN))
1612 return -EPERM;
1613
1614 if (count >= sizeof(temp) || count == 0)
1615 return -EINVAL;
1616
1617 if (copy_from_user(temp, buf, count) != 0)
1618 return -EFAULT;
1619
1620 temp[count] = '\0';
1621
1622 if (sscanf(temp, "%d", &i) != 1)
1623 return -EINVAL;
1624
1625 smk_cipso_doi_value = i;
1626
1627 smk_cipso_doi();
1628
1629 return count;
1630}
1631
1632static const struct file_operations smk_doi_ops = {
1633 .read = smk_read_doi,
1634 .write = smk_write_doi,
1635 .llseek = default_llseek,
1636};
1637
1638/**
1639 * smk_read_direct - read() for /smack/direct
1640 * @filp: file pointer, not actually used
1641 * @buf: where to put the result
1642 * @count: maximum to send along
1643 * @ppos: where to start
1644 *
1645 * Returns number of bytes read or error code, as appropriate
1646 */
1647static ssize_t smk_read_direct(struct file *filp, char __user *buf,
1648 size_t count, loff_t *ppos)
1649{
1650 char temp[80];
1651 ssize_t rc;
1652
1653 if (*ppos != 0)
1654 return 0;
1655
1656 sprintf(temp, "%d", smack_cipso_direct);
1657 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1658
1659 return rc;
1660}
1661
1662/**
1663 * smk_write_direct - write() for /smack/direct
1664 * @file: file pointer, not actually used
1665 * @buf: where to get the data from
1666 * @count: bytes sent
1667 * @ppos: where to start
1668 *
1669 * Returns number of bytes written or error code, as appropriate
1670 */
1671static ssize_t smk_write_direct(struct file *file, const char __user *buf,
1672 size_t count, loff_t *ppos)
1673{
1674 struct smack_known *skp;
1675 char temp[80];
1676 int i;
1677
1678 if (!smack_privileged(CAP_MAC_ADMIN))
1679 return -EPERM;
1680
1681 if (count >= sizeof(temp) || count == 0)
1682 return -EINVAL;
1683
1684 if (copy_from_user(temp, buf, count) != 0)
1685 return -EFAULT;
1686
1687 temp[count] = '\0';
1688
1689 if (sscanf(temp, "%d", &i) != 1)
1690 return -EINVAL;
1691
1692 /*
1693 * Don't do anything if the value hasn't actually changed.
1694 * If it is changing reset the level on entries that were
1695 * set up to be direct when they were created.
1696 */
1697 if (smack_cipso_direct != i) {
1698 mutex_lock(&smack_known_lock);
1699 list_for_each_entry_rcu(skp, &smack_known_list, list)
1700 if (skp->smk_netlabel.attr.mls.lvl ==
1701 smack_cipso_direct)
1702 skp->smk_netlabel.attr.mls.lvl = i;
1703 smack_cipso_direct = i;
1704 mutex_unlock(&smack_known_lock);
1705 }
1706
1707 return count;
1708}
1709
1710static const struct file_operations smk_direct_ops = {
1711 .read = smk_read_direct,
1712 .write = smk_write_direct,
1713 .llseek = default_llseek,
1714};
1715
1716/**
1717 * smk_read_mapped - read() for /smack/mapped
1718 * @filp: file pointer, not actually used
1719 * @buf: where to put the result
1720 * @count: maximum to send along
1721 * @ppos: where to start
1722 *
1723 * Returns number of bytes read or error code, as appropriate
1724 */
1725static ssize_t smk_read_mapped(struct file *filp, char __user *buf,
1726 size_t count, loff_t *ppos)
1727{
1728 char temp[80];
1729 ssize_t rc;
1730
1731 if (*ppos != 0)
1732 return 0;
1733
1734 sprintf(temp, "%d", smack_cipso_mapped);
1735 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
1736
1737 return rc;
1738}
1739
1740/**
1741 * smk_write_mapped - write() for /smack/mapped
1742 * @file: file pointer, not actually used
1743 * @buf: where to get the data from
1744 * @count: bytes sent
1745 * @ppos: where to start
1746 *
1747 * Returns number of bytes written or error code, as appropriate
1748 */
1749static ssize_t smk_write_mapped(struct file *file, const char __user *buf,
1750 size_t count, loff_t *ppos)
1751{
1752 struct smack_known *skp;
1753 char temp[80];
1754 int i;
1755
1756 if (!smack_privileged(CAP_MAC_ADMIN))
1757 return -EPERM;
1758
1759 if (count >= sizeof(temp) || count == 0)
1760 return -EINVAL;
1761
1762 if (copy_from_user(temp, buf, count) != 0)
1763 return -EFAULT;
1764
1765 temp[count] = '\0';
1766
1767 if (sscanf(temp, "%d", &i) != 1)
1768 return -EINVAL;
1769
1770 /*
1771 * Don't do anything if the value hasn't actually changed.
1772 * If it is changing reset the level on entries that were
1773 * set up to be mapped when they were created.
1774 */
1775 if (smack_cipso_mapped != i) {
1776 mutex_lock(&smack_known_lock);
1777 list_for_each_entry_rcu(skp, &smack_known_list, list)
1778 if (skp->smk_netlabel.attr.mls.lvl ==
1779 smack_cipso_mapped)
1780 skp->smk_netlabel.attr.mls.lvl = i;
1781 smack_cipso_mapped = i;
1782 mutex_unlock(&smack_known_lock);
1783 }
1784
1785 return count;
1786}
1787
1788static const struct file_operations smk_mapped_ops = {
1789 .read = smk_read_mapped,
1790 .write = smk_write_mapped,
1791 .llseek = default_llseek,
1792};
1793
1794/**
1795 * smk_read_ambient - read() for /smack/ambient
1796 * @filp: file pointer, not actually used
1797 * @buf: where to put the result
1798 * @cn: maximum to send along
1799 * @ppos: where to start
1800 *
1801 * Returns number of bytes read or error code, as appropriate
1802 */
1803static ssize_t smk_read_ambient(struct file *filp, char __user *buf,
1804 size_t cn, loff_t *ppos)
1805{
1806 ssize_t rc;
1807 int asize;
1808
1809 if (*ppos != 0)
1810 return 0;
1811 /*
1812 * Being careful to avoid a problem in the case where
1813 * smack_net_ambient gets changed in midstream.
1814 */
1815 mutex_lock(&smack_ambient_lock);
1816
1817 asize = strlen(smack_net_ambient->smk_known) + 1;
1818
1819 if (cn >= asize)
1820 rc = simple_read_from_buffer(buf, cn, ppos,
1821 smack_net_ambient->smk_known,
1822 asize);
1823 else
1824 rc = -EINVAL;
1825
1826 mutex_unlock(&smack_ambient_lock);
1827
1828 return rc;
1829}
1830
1831/**
1832 * smk_write_ambient - write() for /smack/ambient
1833 * @file: file pointer, not actually used
1834 * @buf: where to get the data from
1835 * @count: bytes sent
1836 * @ppos: where to start
1837 *
1838 * Returns number of bytes written or error code, as appropriate
1839 */
1840static ssize_t smk_write_ambient(struct file *file, const char __user *buf,
1841 size_t count, loff_t *ppos)
1842{
1843 struct smack_known *skp;
1844 char *oldambient;
1845 char *data;
1846 int rc = count;
1847
1848 if (!smack_privileged(CAP_MAC_ADMIN))
1849 return -EPERM;
1850
1851 /* Enough data must be present */
1852 if (count == 0 || count > PAGE_SIZE)
1853 return -EINVAL;
1854
1855 data = memdup_user_nul(buf, count);
1856 if (IS_ERR(data))
1857 return PTR_ERR(data);
1858
1859 skp = smk_import_entry(data, count);
1860 if (IS_ERR(skp)) {
1861 rc = PTR_ERR(skp);
1862 goto out;
1863 }
1864
1865 mutex_lock(&smack_ambient_lock);
1866
1867 oldambient = smack_net_ambient->smk_known;
1868 smack_net_ambient = skp;
1869 smk_unlbl_ambient(oldambient);
1870
1871 mutex_unlock(&smack_ambient_lock);
1872
1873out:
1874 kfree(data);
1875 return rc;
1876}
1877
1878static const struct file_operations smk_ambient_ops = {
1879 .read = smk_read_ambient,
1880 .write = smk_write_ambient,
1881 .llseek = default_llseek,
1882};
1883
1884/*
1885 * Seq_file operations for /smack/onlycap
1886 */
1887static void *onlycap_seq_start(struct seq_file *s, loff_t *pos)
1888{
1889 return smk_seq_start(s, pos, &smack_onlycap_list);
1890}
1891
1892static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos)
1893{
1894 return smk_seq_next(s, v, pos, &smack_onlycap_list);
1895}
1896
1897static int onlycap_seq_show(struct seq_file *s, void *v)
1898{
1899 struct list_head *list = v;
1900 struct smack_known_list_elem *sklep =
1901 list_entry_rcu(list, struct smack_known_list_elem, list);
1902
1903 seq_puts(s, sklep->smk_label->smk_known);
1904 seq_putc(s, ' ');
1905
1906 return 0;
1907}
1908
1909static const struct seq_operations onlycap_seq_ops = {
1910 .start = onlycap_seq_start,
1911 .next = onlycap_seq_next,
1912 .show = onlycap_seq_show,
1913 .stop = smk_seq_stop,
1914};
1915
1916static int smk_open_onlycap(struct inode *inode, struct file *file)
1917{
1918 return seq_open(file, &onlycap_seq_ops);
1919}
1920
1921/**
1922 * smk_list_swap_rcu - swap public list with a private one in RCU-safe way
1923 * The caller must hold appropriate mutex to prevent concurrent modifications
1924 * to the public list.
1925 * Private list is assumed to be not accessible to other threads yet.
1926 *
1927 * @public: public list
1928 * @private: private list
1929 */
1930static void smk_list_swap_rcu(struct list_head *public,
1931 struct list_head *private)
1932{
1933 struct list_head *first, *last;
1934
1935 if (list_empty(public)) {
1936 list_splice_init_rcu(private, public, synchronize_rcu);
1937 } else {
1938 /* Remember public list before replacing it */
1939 first = public->next;
1940 last = public->prev;
1941
1942 /* Publish private list in place of public in RCU-safe way */
1943 private->prev->next = public;
1944 private->next->prev = public;
1945 rcu_assign_pointer(public->next, private->next);
1946 public->prev = private->prev;
1947
1948 synchronize_rcu();
1949
1950 /* When all readers are done with the old public list,
1951 * attach it in place of private */
1952 private->next = first;
1953 private->prev = last;
1954 first->prev = private;
1955 last->next = private;
1956 }
1957}
1958
1959/**
1960 * smk_parse_label_list - parse list of Smack labels, separated by spaces
1961 *
1962 * @data: the string to parse
1963 * @list: destination list
1964 *
1965 * Returns zero on success or error code, as appropriate
1966 */
1967static int smk_parse_label_list(char *data, struct list_head *list)
1968{
1969 char *tok;
1970 struct smack_known *skp;
1971 struct smack_known_list_elem *sklep;
1972
1973 while ((tok = strsep(&data, " ")) != NULL) {
1974 if (!*tok)
1975 continue;
1976
1977 skp = smk_import_entry(tok, 0);
1978 if (IS_ERR(skp))
1979 return PTR_ERR(skp);
1980
1981 sklep = kzalloc(sizeof(*sklep), GFP_KERNEL);
1982 if (sklep == NULL)
1983 return -ENOMEM;
1984
1985 sklep->smk_label = skp;
1986 list_add(&sklep->list, list);
1987 }
1988
1989 return 0;
1990}
1991
1992/**
1993 * smk_destroy_label_list - destroy a list of smack_known_list_elem
1994 * @list: header pointer of the list to destroy
1995 */
1996void smk_destroy_label_list(struct list_head *list)
1997{
1998 struct smack_known_list_elem *sklep;
1999 struct smack_known_list_elem *sklep2;
2000
2001 list_for_each_entry_safe(sklep, sklep2, list, list)
2002 kfree(sklep);
2003
2004 INIT_LIST_HEAD(list);
2005}
2006
2007/**
2008 * smk_write_onlycap - write() for smackfs/onlycap
2009 * @file: file pointer, not actually used
2010 * @buf: where to get the data from
2011 * @count: bytes sent
2012 * @ppos: where to start
2013 *
2014 * Returns number of bytes written or error code, as appropriate
2015 */
2016static ssize_t smk_write_onlycap(struct file *file, const char __user *buf,
2017 size_t count, loff_t *ppos)
2018{
2019 char *data;
2020 LIST_HEAD(list_tmp);
2021 int rc;
2022
2023 if (!smack_privileged(CAP_MAC_ADMIN))
2024 return -EPERM;
2025
2026 if (count > PAGE_SIZE)
2027 return -EINVAL;
2028
2029 data = memdup_user_nul(buf, count);
2030 if (IS_ERR(data))
2031 return PTR_ERR(data);
2032
2033 rc = smk_parse_label_list(data, &list_tmp);
2034 kfree(data);
2035
2036 /*
2037 * Clear the smack_onlycap on invalid label errors. This means
2038 * that we can pass a null string to unset the onlycap value.
2039 *
2040 * Importing will also reject a label beginning with '-',
2041 * so "-usecapabilities" will also work.
2042 *
2043 * But do so only on invalid label, not on system errors.
2044 * The invalid label must be first to count as clearing attempt.
2045 */
2046 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2047 mutex_lock(&smack_onlycap_lock);
2048 smk_list_swap_rcu(&smack_onlycap_list, &list_tmp);
2049 mutex_unlock(&smack_onlycap_lock);
2050 rc = count;
2051 }
2052
2053 smk_destroy_label_list(&list_tmp);
2054
2055 return rc;
2056}
2057
2058static const struct file_operations smk_onlycap_ops = {
2059 .open = smk_open_onlycap,
2060 .read = seq_read,
2061 .write = smk_write_onlycap,
2062 .llseek = seq_lseek,
2063 .release = seq_release,
2064};
2065
2066#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2067/**
2068 * smk_read_unconfined - read() for smackfs/unconfined
2069 * @filp: file pointer, not actually used
2070 * @buf: where to put the result
2071 * @cn: maximum to send along
2072 * @ppos: where to start
2073 *
2074 * Returns number of bytes read or error code, as appropriate
2075 */
2076static ssize_t smk_read_unconfined(struct file *filp, char __user *buf,
2077 size_t cn, loff_t *ppos)
2078{
2079 char *smack = "";
2080 ssize_t rc = -EINVAL;
2081 int asize;
2082
2083 if (*ppos != 0)
2084 return 0;
2085
2086 if (smack_unconfined != NULL)
2087 smack = smack_unconfined->smk_known;
2088
2089 asize = strlen(smack) + 1;
2090
2091 if (cn >= asize)
2092 rc = simple_read_from_buffer(buf, cn, ppos, smack, asize);
2093
2094 return rc;
2095}
2096
2097/**
2098 * smk_write_unconfined - write() for smackfs/unconfined
2099 * @file: file pointer, not actually used
2100 * @buf: where to get the data from
2101 * @count: bytes sent
2102 * @ppos: where to start
2103 *
2104 * Returns number of bytes written or error code, as appropriate
2105 */
2106static ssize_t smk_write_unconfined(struct file *file, const char __user *buf,
2107 size_t count, loff_t *ppos)
2108{
2109 char *data;
2110 struct smack_known *skp;
2111 int rc = count;
2112
2113 if (!smack_privileged(CAP_MAC_ADMIN))
2114 return -EPERM;
2115
2116 if (count > PAGE_SIZE)
2117 return -EINVAL;
2118
2119 data = memdup_user_nul(buf, count);
2120 if (IS_ERR(data))
2121 return PTR_ERR(data);
2122
2123 /*
2124 * Clear the smack_unconfined on invalid label errors. This means
2125 * that we can pass a null string to unset the unconfined value.
2126 *
2127 * Importing will also reject a label beginning with '-',
2128 * so "-confine" will also work.
2129 *
2130 * But do so only on invalid label, not on system errors.
2131 */
2132 skp = smk_import_entry(data, count);
2133 if (PTR_ERR(skp) == -EINVAL)
2134 skp = NULL;
2135 else if (IS_ERR(skp)) {
2136 rc = PTR_ERR(skp);
2137 goto freeout;
2138 }
2139
2140 smack_unconfined = skp;
2141
2142freeout:
2143 kfree(data);
2144 return rc;
2145}
2146
2147static const struct file_operations smk_unconfined_ops = {
2148 .read = smk_read_unconfined,
2149 .write = smk_write_unconfined,
2150 .llseek = default_llseek,
2151};
2152#endif /* CONFIG_SECURITY_SMACK_BRINGUP */
2153
2154/**
2155 * smk_read_logging - read() for /smack/logging
2156 * @filp: file pointer, not actually used
2157 * @buf: where to put the result
2158 * @count: maximum to send along
2159 * @ppos: where to start
2160 *
2161 * Returns number of bytes read or error code, as appropriate
2162 */
2163static ssize_t smk_read_logging(struct file *filp, char __user *buf,
2164 size_t count, loff_t *ppos)
2165{
2166 char temp[32];
2167 ssize_t rc;
2168
2169 if (*ppos != 0)
2170 return 0;
2171
2172 sprintf(temp, "%d\n", log_policy);
2173 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2174 return rc;
2175}
2176
2177/**
2178 * smk_write_logging - write() for /smack/logging
2179 * @file: file pointer, not actually used
2180 * @buf: where to get the data from
2181 * @count: bytes sent
2182 * @ppos: where to start
2183 *
2184 * Returns number of bytes written or error code, as appropriate
2185 */
2186static ssize_t smk_write_logging(struct file *file, const char __user *buf,
2187 size_t count, loff_t *ppos)
2188{
2189 char temp[32];
2190 int i;
2191
2192 if (!smack_privileged(CAP_MAC_ADMIN))
2193 return -EPERM;
2194
2195 if (count >= sizeof(temp) || count == 0)
2196 return -EINVAL;
2197
2198 if (copy_from_user(temp, buf, count) != 0)
2199 return -EFAULT;
2200
2201 temp[count] = '\0';
2202
2203 if (sscanf(temp, "%d", &i) != 1)
2204 return -EINVAL;
2205 if (i < 0 || i > 3)
2206 return -EINVAL;
2207 log_policy = i;
2208 return count;
2209}
2210
2211
2212
2213static const struct file_operations smk_logging_ops = {
2214 .read = smk_read_logging,
2215 .write = smk_write_logging,
2216 .llseek = default_llseek,
2217};
2218
2219/*
2220 * Seq_file read operations for /smack/load-self
2221 */
2222
2223static void *load_self_seq_start(struct seq_file *s, loff_t *pos)
2224{
2225 struct task_smack *tsp = smack_cred(current_cred());
2226
2227 return smk_seq_start(s, pos, &tsp->smk_rules);
2228}
2229
2230static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2231{
2232 struct task_smack *tsp = smack_cred(current_cred());
2233
2234 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2235}
2236
2237static int load_self_seq_show(struct seq_file *s, void *v)
2238{
2239 struct list_head *list = v;
2240 struct smack_rule *srp =
2241 list_entry_rcu(list, struct smack_rule, list);
2242
2243 smk_rule_show(s, srp, SMK_LABELLEN);
2244
2245 return 0;
2246}
2247
2248static const struct seq_operations load_self_seq_ops = {
2249 .start = load_self_seq_start,
2250 .next = load_self_seq_next,
2251 .show = load_self_seq_show,
2252 .stop = smk_seq_stop,
2253};
2254
2255
2256/**
2257 * smk_open_load_self - open() for /smack/load-self2
2258 * @inode: inode structure representing file
2259 * @file: "load" file pointer
2260 *
2261 * For reading, use load_seq_* seq_file reading operations.
2262 */
2263static int smk_open_load_self(struct inode *inode, struct file *file)
2264{
2265 return seq_open(file, &load_self_seq_ops);
2266}
2267
2268/**
2269 * smk_write_load_self - write() for /smack/load-self
2270 * @file: file pointer, not actually used
2271 * @buf: where to get the data from
2272 * @count: bytes sent
2273 * @ppos: where to start - must be 0
2274 *
2275 */
2276static ssize_t smk_write_load_self(struct file *file, const char __user *buf,
2277 size_t count, loff_t *ppos)
2278{
2279 struct task_smack *tsp = smack_cred(current_cred());
2280
2281 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2282 &tsp->smk_rules_lock, SMK_FIXED24_FMT);
2283}
2284
2285static const struct file_operations smk_load_self_ops = {
2286 .open = smk_open_load_self,
2287 .read = seq_read,
2288 .llseek = seq_lseek,
2289 .write = smk_write_load_self,
2290 .release = seq_release,
2291};
2292
2293/**
2294 * smk_user_access - handle access check transaction
2295 * @file: file pointer
2296 * @buf: data from user space
2297 * @count: bytes sent
2298 * @ppos: where to start - must be 0
2299 * @format: /smack/load or /smack/load2 or /smack/change-rule format.
2300 */
2301static ssize_t smk_user_access(struct file *file, const char __user *buf,
2302 size_t count, loff_t *ppos, int format)
2303{
2304 struct smack_parsed_rule rule;
2305 char *data;
2306 int res;
2307
2308 data = simple_transaction_get(file, buf, count);
2309 if (IS_ERR(data))
2310 return PTR_ERR(data);
2311
2312 if (format == SMK_FIXED24_FMT) {
2313 if (count < SMK_LOADLEN)
2314 return -EINVAL;
2315 res = smk_parse_rule(data, &rule, 0);
2316 } else {
2317 /*
2318 * simple_transaction_get() returns null-terminated data
2319 */
2320 res = smk_parse_long_rule(data, &rule, 0, 3);
2321 }
2322
2323 if (res >= 0)
2324 res = smk_access(rule.smk_subject, rule.smk_object,
2325 rule.smk_access1, NULL);
2326 else if (res != -ENOENT)
2327 return res;
2328
2329 /*
2330 * smk_access() can return a value > 0 in the "bringup" case.
2331 */
2332 data[0] = res >= 0 ? '1' : '0';
2333 data[1] = '\0';
2334
2335 simple_transaction_set(file, 2);
2336
2337 if (format == SMK_FIXED24_FMT)
2338 return SMK_LOADLEN;
2339 return count;
2340}
2341
2342/**
2343 * smk_write_access - handle access check transaction
2344 * @file: file pointer
2345 * @buf: data from user space
2346 * @count: bytes sent
2347 * @ppos: where to start - must be 0
2348 */
2349static ssize_t smk_write_access(struct file *file, const char __user *buf,
2350 size_t count, loff_t *ppos)
2351{
2352 return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT);
2353}
2354
2355static const struct file_operations smk_access_ops = {
2356 .write = smk_write_access,
2357 .read = simple_transaction_read,
2358 .release = simple_transaction_release,
2359 .llseek = generic_file_llseek,
2360};
2361
2362
2363/*
2364 * Seq_file read operations for /smack/load2
2365 */
2366
2367static int load2_seq_show(struct seq_file *s, void *v)
2368{
2369 struct list_head *list = v;
2370 struct smack_rule *srp;
2371 struct smack_known *skp =
2372 list_entry_rcu(list, struct smack_known, list);
2373
2374 list_for_each_entry_rcu(srp, &skp->smk_rules, list)
2375 smk_rule_show(s, srp, SMK_LONGLABEL);
2376
2377 return 0;
2378}
2379
2380static const struct seq_operations load2_seq_ops = {
2381 .start = load2_seq_start,
2382 .next = load2_seq_next,
2383 .show = load2_seq_show,
2384 .stop = smk_seq_stop,
2385};
2386
2387/**
2388 * smk_open_load2 - open() for /smack/load2
2389 * @inode: inode structure representing file
2390 * @file: "load2" file pointer
2391 *
2392 * For reading, use load2_seq_* seq_file reading operations.
2393 */
2394static int smk_open_load2(struct inode *inode, struct file *file)
2395{
2396 return seq_open(file, &load2_seq_ops);
2397}
2398
2399/**
2400 * smk_write_load2 - write() for /smack/load2
2401 * @file: file pointer, not actually used
2402 * @buf: where to get the data from
2403 * @count: bytes sent
2404 * @ppos: where to start - must be 0
2405 *
2406 */
2407static ssize_t smk_write_load2(struct file *file, const char __user *buf,
2408 size_t count, loff_t *ppos)
2409{
2410 /*
2411 * Must have privilege.
2412 */
2413 if (!smack_privileged(CAP_MAC_ADMIN))
2414 return -EPERM;
2415
2416 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2417 SMK_LONG_FMT);
2418}
2419
2420static const struct file_operations smk_load2_ops = {
2421 .open = smk_open_load2,
2422 .read = seq_read,
2423 .llseek = seq_lseek,
2424 .write = smk_write_load2,
2425 .release = seq_release,
2426};
2427
2428/*
2429 * Seq_file read operations for /smack/load-self2
2430 */
2431
2432static void *load_self2_seq_start(struct seq_file *s, loff_t *pos)
2433{
2434 struct task_smack *tsp = smack_cred(current_cred());
2435
2436 return smk_seq_start(s, pos, &tsp->smk_rules);
2437}
2438
2439static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos)
2440{
2441 struct task_smack *tsp = smack_cred(current_cred());
2442
2443 return smk_seq_next(s, v, pos, &tsp->smk_rules);
2444}
2445
2446static int load_self2_seq_show(struct seq_file *s, void *v)
2447{
2448 struct list_head *list = v;
2449 struct smack_rule *srp =
2450 list_entry_rcu(list, struct smack_rule, list);
2451
2452 smk_rule_show(s, srp, SMK_LONGLABEL);
2453
2454 return 0;
2455}
2456
2457static const struct seq_operations load_self2_seq_ops = {
2458 .start = load_self2_seq_start,
2459 .next = load_self2_seq_next,
2460 .show = load_self2_seq_show,
2461 .stop = smk_seq_stop,
2462};
2463
2464/**
2465 * smk_open_load_self2 - open() for /smack/load-self2
2466 * @inode: inode structure representing file
2467 * @file: "load" file pointer
2468 *
2469 * For reading, use load_seq_* seq_file reading operations.
2470 */
2471static int smk_open_load_self2(struct inode *inode, struct file *file)
2472{
2473 return seq_open(file, &load_self2_seq_ops);
2474}
2475
2476/**
2477 * smk_write_load_self2 - write() for /smack/load-self2
2478 * @file: file pointer, not actually used
2479 * @buf: where to get the data from
2480 * @count: bytes sent
2481 * @ppos: where to start - must be 0
2482 *
2483 */
2484static ssize_t smk_write_load_self2(struct file *file, const char __user *buf,
2485 size_t count, loff_t *ppos)
2486{
2487 struct task_smack *tsp = smack_cred(current_cred());
2488
2489 return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules,
2490 &tsp->smk_rules_lock, SMK_LONG_FMT);
2491}
2492
2493static const struct file_operations smk_load_self2_ops = {
2494 .open = smk_open_load_self2,
2495 .read = seq_read,
2496 .llseek = seq_lseek,
2497 .write = smk_write_load_self2,
2498 .release = seq_release,
2499};
2500
2501/**
2502 * smk_write_access2 - handle access check transaction
2503 * @file: file pointer
2504 * @buf: data from user space
2505 * @count: bytes sent
2506 * @ppos: where to start - must be 0
2507 */
2508static ssize_t smk_write_access2(struct file *file, const char __user *buf,
2509 size_t count, loff_t *ppos)
2510{
2511 return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT);
2512}
2513
2514static const struct file_operations smk_access2_ops = {
2515 .write = smk_write_access2,
2516 .read = simple_transaction_read,
2517 .release = simple_transaction_release,
2518 .llseek = generic_file_llseek,
2519};
2520
2521/**
2522 * smk_write_revoke_subj - write() for /smack/revoke-subject
2523 * @file: file pointer
2524 * @buf: data from user space
2525 * @count: bytes sent
2526 * @ppos: where to start - must be 0
2527 */
2528static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf,
2529 size_t count, loff_t *ppos)
2530{
2531 char *data;
2532 const char *cp;
2533 struct smack_known *skp;
2534 struct smack_rule *sp;
2535 struct list_head *rule_list;
2536 struct mutex *rule_lock;
2537 int rc = count;
2538
2539 if (*ppos != 0)
2540 return -EINVAL;
2541
2542 if (!smack_privileged(CAP_MAC_ADMIN))
2543 return -EPERM;
2544
2545 if (count == 0 || count > SMK_LONGLABEL)
2546 return -EINVAL;
2547
2548 data = memdup_user(buf, count);
2549 if (IS_ERR(data))
2550 return PTR_ERR(data);
2551
2552 cp = smk_parse_smack(data, count);
2553 if (IS_ERR(cp)) {
2554 rc = PTR_ERR(cp);
2555 goto out_data;
2556 }
2557
2558 skp = smk_find_entry(cp);
2559 if (skp == NULL)
2560 goto out_cp;
2561
2562 rule_list = &skp->smk_rules;
2563 rule_lock = &skp->smk_rules_lock;
2564
2565 mutex_lock(rule_lock);
2566
2567 list_for_each_entry_rcu(sp, rule_list, list)
2568 sp->smk_access = 0;
2569
2570 mutex_unlock(rule_lock);
2571
2572out_cp:
2573 kfree(cp);
2574out_data:
2575 kfree(data);
2576
2577 return rc;
2578}
2579
2580static const struct file_operations smk_revoke_subj_ops = {
2581 .write = smk_write_revoke_subj,
2582 .read = simple_transaction_read,
2583 .release = simple_transaction_release,
2584 .llseek = generic_file_llseek,
2585};
2586
2587/**
2588 * smk_init_sysfs - initialize /sys/fs/smackfs
2589 *
2590 */
2591static int smk_init_sysfs(void)
2592{
2593 return sysfs_create_mount_point(fs_kobj, "smackfs");
2594}
2595
2596/**
2597 * smk_write_change_rule - write() for /smack/change-rule
2598 * @file: file pointer
2599 * @buf: data from user space
2600 * @count: bytes sent
2601 * @ppos: where to start - must be 0
2602 */
2603static ssize_t smk_write_change_rule(struct file *file, const char __user *buf,
2604 size_t count, loff_t *ppos)
2605{
2606 /*
2607 * Must have privilege.
2608 */
2609 if (!smack_privileged(CAP_MAC_ADMIN))
2610 return -EPERM;
2611
2612 return smk_write_rules_list(file, buf, count, ppos, NULL, NULL,
2613 SMK_CHANGE_FMT);
2614}
2615
2616static const struct file_operations smk_change_rule_ops = {
2617 .write = smk_write_change_rule,
2618 .read = simple_transaction_read,
2619 .release = simple_transaction_release,
2620 .llseek = generic_file_llseek,
2621};
2622
2623/**
2624 * smk_read_syslog - read() for smackfs/syslog
2625 * @filp: file pointer, not actually used
2626 * @buf: where to put the result
2627 * @cn: maximum to send along
2628 * @ppos: where to start
2629 *
2630 * Returns number of bytes read or error code, as appropriate
2631 */
2632static ssize_t smk_read_syslog(struct file *filp, char __user *buf,
2633 size_t cn, loff_t *ppos)
2634{
2635 struct smack_known *skp;
2636 ssize_t rc = -EINVAL;
2637 int asize;
2638
2639 if (*ppos != 0)
2640 return 0;
2641
2642 if (smack_syslog_label == NULL)
2643 skp = &smack_known_star;
2644 else
2645 skp = smack_syslog_label;
2646
2647 asize = strlen(skp->smk_known) + 1;
2648
2649 if (cn >= asize)
2650 rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known,
2651 asize);
2652
2653 return rc;
2654}
2655
2656/**
2657 * smk_write_syslog - write() for smackfs/syslog
2658 * @file: file pointer, not actually used
2659 * @buf: where to get the data from
2660 * @count: bytes sent
2661 * @ppos: where to start
2662 *
2663 * Returns number of bytes written or error code, as appropriate
2664 */
2665static ssize_t smk_write_syslog(struct file *file, const char __user *buf,
2666 size_t count, loff_t *ppos)
2667{
2668 char *data;
2669 struct smack_known *skp;
2670 int rc = count;
2671
2672 if (!smack_privileged(CAP_MAC_ADMIN))
2673 return -EPERM;
2674
2675 /* Enough data must be present */
2676 if (count == 0 || count > PAGE_SIZE)
2677 return -EINVAL;
2678
2679 data = memdup_user_nul(buf, count);
2680 if (IS_ERR(data))
2681 return PTR_ERR(data);
2682
2683 skp = smk_import_entry(data, count);
2684 if (IS_ERR(skp))
2685 rc = PTR_ERR(skp);
2686 else
2687 smack_syslog_label = skp;
2688
2689 kfree(data);
2690 return rc;
2691}
2692
2693static const struct file_operations smk_syslog_ops = {
2694 .read = smk_read_syslog,
2695 .write = smk_write_syslog,
2696 .llseek = default_llseek,
2697};
2698
2699/*
2700 * Seq_file read operations for /smack/relabel-self
2701 */
2702
2703static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos)
2704{
2705 struct task_smack *tsp = smack_cred(current_cred());
2706
2707 return smk_seq_start(s, pos, &tsp->smk_relabel);
2708}
2709
2710static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos)
2711{
2712 struct task_smack *tsp = smack_cred(current_cred());
2713
2714 return smk_seq_next(s, v, pos, &tsp->smk_relabel);
2715}
2716
2717static int relabel_self_seq_show(struct seq_file *s, void *v)
2718{
2719 struct list_head *list = v;
2720 struct smack_known_list_elem *sklep =
2721 list_entry(list, struct smack_known_list_elem, list);
2722
2723 seq_puts(s, sklep->smk_label->smk_known);
2724 seq_putc(s, ' ');
2725
2726 return 0;
2727}
2728
2729static const struct seq_operations relabel_self_seq_ops = {
2730 .start = relabel_self_seq_start,
2731 .next = relabel_self_seq_next,
2732 .show = relabel_self_seq_show,
2733 .stop = smk_seq_stop,
2734};
2735
2736/**
2737 * smk_open_relabel_self - open() for /smack/relabel-self
2738 * @inode: inode structure representing file
2739 * @file: "relabel-self" file pointer
2740 *
2741 * Connect our relabel_self_seq_* operations with /smack/relabel-self
2742 * file_operations
2743 */
2744static int smk_open_relabel_self(struct inode *inode, struct file *file)
2745{
2746 return seq_open(file, &relabel_self_seq_ops);
2747}
2748
2749/**
2750 * smk_write_relabel_self - write() for /smack/relabel-self
2751 * @file: file pointer, not actually used
2752 * @buf: where to get the data from
2753 * @count: bytes sent
2754 * @ppos: where to start - must be 0
2755 *
2756 */
2757static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf,
2758 size_t count, loff_t *ppos)
2759{
2760 char *data;
2761 int rc;
2762 LIST_HEAD(list_tmp);
2763
2764 /*
2765 * Must have privilege.
2766 */
2767 if (!smack_privileged(CAP_MAC_ADMIN))
2768 return -EPERM;
2769
2770 /*
2771 * No partial write.
2772 * Enough data must be present.
2773 */
2774 if (*ppos != 0)
2775 return -EINVAL;
2776 if (count == 0 || count > PAGE_SIZE)
2777 return -EINVAL;
2778
2779 data = memdup_user_nul(buf, count);
2780 if (IS_ERR(data))
2781 return PTR_ERR(data);
2782
2783 rc = smk_parse_label_list(data, &list_tmp);
2784 kfree(data);
2785
2786 if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) {
2787 struct cred *new;
2788 struct task_smack *tsp;
2789
2790 new = prepare_creds();
2791 if (!new) {
2792 rc = -ENOMEM;
2793 goto out;
2794 }
2795 tsp = smack_cred(new);
2796 smk_destroy_label_list(&tsp->smk_relabel);
2797 list_splice(&list_tmp, &tsp->smk_relabel);
2798 commit_creds(new);
2799 return count;
2800 }
2801out:
2802 smk_destroy_label_list(&list_tmp);
2803 return rc;
2804}
2805
2806static const struct file_operations smk_relabel_self_ops = {
2807 .open = smk_open_relabel_self,
2808 .read = seq_read,
2809 .llseek = seq_lseek,
2810 .write = smk_write_relabel_self,
2811 .release = seq_release,
2812};
2813
2814/**
2815 * smk_read_ptrace - read() for /smack/ptrace
2816 * @filp: file pointer, not actually used
2817 * @buf: where to put the result
2818 * @count: maximum to send along
2819 * @ppos: where to start
2820 *
2821 * Returns number of bytes read or error code, as appropriate
2822 */
2823static ssize_t smk_read_ptrace(struct file *filp, char __user *buf,
2824 size_t count, loff_t *ppos)
2825{
2826 char temp[32];
2827 ssize_t rc;
2828
2829 if (*ppos != 0)
2830 return 0;
2831
2832 sprintf(temp, "%d\n", smack_ptrace_rule);
2833 rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp));
2834 return rc;
2835}
2836
2837/**
2838 * smk_write_ptrace - write() for /smack/ptrace
2839 * @file: file pointer
2840 * @buf: data from user space
2841 * @count: bytes sent
2842 * @ppos: where to start - must be 0
2843 */
2844static ssize_t smk_write_ptrace(struct file *file, const char __user *buf,
2845 size_t count, loff_t *ppos)
2846{
2847 char temp[32];
2848 int i;
2849
2850 if (!smack_privileged(CAP_MAC_ADMIN))
2851 return -EPERM;
2852
2853 if (*ppos != 0 || count >= sizeof(temp) || count == 0)
2854 return -EINVAL;
2855
2856 if (copy_from_user(temp, buf, count) != 0)
2857 return -EFAULT;
2858
2859 temp[count] = '\0';
2860
2861 if (sscanf(temp, "%d", &i) != 1)
2862 return -EINVAL;
2863 if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX)
2864 return -EINVAL;
2865 smack_ptrace_rule = i;
2866
2867 return count;
2868}
2869
2870static const struct file_operations smk_ptrace_ops = {
2871 .write = smk_write_ptrace,
2872 .read = smk_read_ptrace,
2873 .llseek = default_llseek,
2874};
2875
2876/**
2877 * smk_fill_super - fill the smackfs superblock
2878 * @sb: the empty superblock
2879 * @fc: unused
2880 *
2881 * Fill in the well known entries for the smack filesystem
2882 *
2883 * Returns 0 on success, an error code on failure
2884 */
2885static int smk_fill_super(struct super_block *sb, struct fs_context *fc)
2886{
2887 int rc;
2888
2889 static const struct tree_descr smack_files[] = {
2890 [SMK_LOAD] = {
2891 "load", &smk_load_ops, S_IRUGO|S_IWUSR},
2892 [SMK_CIPSO] = {
2893 "cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR},
2894 [SMK_DOI] = {
2895 "doi", &smk_doi_ops, S_IRUGO|S_IWUSR},
2896 [SMK_DIRECT] = {
2897 "direct", &smk_direct_ops, S_IRUGO|S_IWUSR},
2898 [SMK_AMBIENT] = {
2899 "ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR},
2900 [SMK_NET4ADDR] = {
2901 "netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR},
2902 [SMK_ONLYCAP] = {
2903 "onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR},
2904 [SMK_LOGGING] = {
2905 "logging", &smk_logging_ops, S_IRUGO|S_IWUSR},
2906 [SMK_LOAD_SELF] = {
2907 "load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO},
2908 [SMK_ACCESSES] = {
2909 "access", &smk_access_ops, S_IRUGO|S_IWUGO},
2910 [SMK_MAPPED] = {
2911 "mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR},
2912 [SMK_LOAD2] = {
2913 "load2", &smk_load2_ops, S_IRUGO|S_IWUSR},
2914 [SMK_LOAD_SELF2] = {
2915 "load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO},
2916 [SMK_ACCESS2] = {
2917 "access2", &smk_access2_ops, S_IRUGO|S_IWUGO},
2918 [SMK_CIPSO2] = {
2919 "cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR},
2920 [SMK_REVOKE_SUBJ] = {
2921 "revoke-subject", &smk_revoke_subj_ops,
2922 S_IRUGO|S_IWUSR},
2923 [SMK_CHANGE_RULE] = {
2924 "change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR},
2925 [SMK_SYSLOG] = {
2926 "syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR},
2927 [SMK_PTRACE] = {
2928 "ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR},
2929#ifdef CONFIG_SECURITY_SMACK_BRINGUP
2930 [SMK_UNCONFINED] = {
2931 "unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR},
2932#endif
2933#if IS_ENABLED(CONFIG_IPV6)
2934 [SMK_NET6ADDR] = {
2935 "ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR},
2936#endif /* CONFIG_IPV6 */
2937 [SMK_RELABEL_SELF] = {
2938 "relabel-self", &smk_relabel_self_ops,
2939 S_IRUGO|S_IWUGO},
2940 /* last one */
2941 {""}
2942 };
2943
2944 rc = simple_fill_super(sb, SMACK_MAGIC, smack_files);
2945 if (rc != 0) {
2946 printk(KERN_ERR "%s failed %d while creating inodes\n",
2947 __func__, rc);
2948 return rc;
2949 }
2950
2951 return 0;
2952}
2953
2954/**
2955 * smk_get_tree - get the smackfs superblock
2956 * @fc: The mount context, including any options
2957 *
2958 * Just passes everything along.
2959 *
2960 * Returns what the lower level code does.
2961 */
2962static int smk_get_tree(struct fs_context *fc)
2963{
2964 return get_tree_single(fc, smk_fill_super);
2965}
2966
2967static const struct fs_context_operations smk_context_ops = {
2968 .get_tree = smk_get_tree,
2969};
2970
2971/**
2972 * smk_init_fs_context - Initialise a filesystem context for smackfs
2973 * @fc: The blank mount context
2974 */
2975static int smk_init_fs_context(struct fs_context *fc)
2976{
2977 fc->ops = &smk_context_ops;
2978 return 0;
2979}
2980
2981static struct file_system_type smk_fs_type = {
2982 .name = "smackfs",
2983 .init_fs_context = smk_init_fs_context,
2984 .kill_sb = kill_litter_super,
2985};
2986
2987static struct vfsmount *smackfs_mount;
2988
2989/**
2990 * init_smk_fs - get the smackfs superblock
2991 *
2992 * register the smackfs
2993 *
2994 * Do not register smackfs if Smack wasn't enabled
2995 * on boot. We can not put this method normally under the
2996 * smack_init() code path since the security subsystem get
2997 * initialized before the vfs caches.
2998 *
2999 * Returns true if we were not chosen on boot or if
3000 * we were chosen and filesystem registration succeeded.
3001 */
3002static int __init init_smk_fs(void)
3003{
3004 int err;
3005 int rc;
3006
3007 if (smack_enabled == 0)
3008 return 0;
3009
3010 err = smk_init_sysfs();
3011 if (err)
3012 printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n");
3013
3014 err = register_filesystem(&smk_fs_type);
3015 if (!err) {
3016 smackfs_mount = kern_mount(&smk_fs_type);
3017 if (IS_ERR(smackfs_mount)) {
3018 printk(KERN_ERR "smackfs: could not mount!\n");
3019 err = PTR_ERR(smackfs_mount);
3020 smackfs_mount = NULL;
3021 }
3022 }
3023
3024 smk_cipso_doi();
3025 smk_unlbl_ambient(NULL);
3026
3027 rc = smack_populate_secattr(&smack_known_floor);
3028 if (err == 0 && rc < 0)
3029 err = rc;
3030 rc = smack_populate_secattr(&smack_known_hat);
3031 if (err == 0 && rc < 0)
3032 err = rc;
3033 rc = smack_populate_secattr(&smack_known_huh);
3034 if (err == 0 && rc < 0)
3035 err = rc;
3036 rc = smack_populate_secattr(&smack_known_star);
3037 if (err == 0 && rc < 0)
3038 err = rc;
3039 rc = smack_populate_secattr(&smack_known_web);
3040 if (err == 0 && rc < 0)
3041 err = rc;
3042
3043 return err;
3044}
3045
3046__initcall(init_smk_fs);