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