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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / security / selinux / selinuxfs.c
blob0293843f7eda7d41e7722bd55e41bbc5ea0110a3
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul.moore@hp.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31
32 /* selinuxfs pseudo filesystem for exporting the security policy API.
33 Based on the proc code and the fs/nfsd/nfsctl.c code. */
34
35 #include "flask.h"
36 #include "avc.h"
37 #include "avc_ss.h"
38 #include "security.h"
39 #include "objsec.h"
40 #include "conditional.h"
41
42 /* Policy capability filenames */
43 static char *policycap_names[] = {
44 "network_peer_controls",
45 "open_perms"
46 };
47
48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
49
50 static int __init checkreqprot_setup(char *str)
51 {
52 unsigned long checkreqprot;
53 if (!strict_strtoul(str, 0, &checkreqprot))
54 selinux_checkreqprot = checkreqprot ? 1 : 0;
55 return 1;
56 }
57 __setup("checkreqprot=", checkreqprot_setup);
58
59 static DEFINE_MUTEX(sel_mutex);
60
61 /* global data for booleans */
62 static struct dentry *bool_dir;
63 static int bool_num;
64 static char **bool_pending_names;
65 static int *bool_pending_values;
66
67 /* global data for classes */
68 static struct dentry *class_dir;
69 static unsigned long last_class_ino;
70
71 /* global data for policy capabilities */
72 static struct dentry *policycap_dir;
73
74 extern void selnl_notify_setenforce(int val);
75
76 /* Check whether a task is allowed to use a security operation. */
77 static int task_has_security(struct task_struct *tsk,
78 u32 perms)
79 {
80 const struct task_security_struct *tsec;
81 u32 sid = 0;
82
83 rcu_read_lock();
84 tsec = __task_cred(tsk)->security;
85 if (tsec)
86 sid = tsec->sid;
87 rcu_read_unlock();
88 if (!tsec)
89 return -EACCES;
90
91 return avc_has_perm(sid, SECINITSID_SECURITY,
92 SECCLASS_SECURITY, perms, NULL);
93 }
94
95 enum sel_inos {
96 SEL_ROOT_INO = 2,
97 SEL_LOAD, /* load policy */
98 SEL_ENFORCE, /* get or set enforcing status */
99 SEL_CONTEXT, /* validate context */
100 SEL_ACCESS, /* compute access decision */
101 SEL_CREATE, /* compute create labeling decision */
102 SEL_RELABEL, /* compute relabeling decision */
103 SEL_USER, /* compute reachable user contexts */
104 SEL_POLICYVERS, /* return policy version for this kernel */
105 SEL_COMMIT_BOOLS, /* commit new boolean values */
106 SEL_MLS, /* return if MLS policy is enabled */
107 SEL_DISABLE, /* disable SELinux until next reboot */
108 SEL_MEMBER, /* compute polyinstantiation membership decision */
109 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
110 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
111 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
112 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
113 SEL_INO_NEXT, /* The next inode number to use */
114 };
115
116 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
117
118 #define SEL_INITCON_INO_OFFSET 0x01000000
119 #define SEL_BOOL_INO_OFFSET 0x02000000
120 #define SEL_CLASS_INO_OFFSET 0x04000000
121 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
122 #define SEL_INO_MASK 0x00ffffff
123
124 #define TMPBUFLEN 12
125 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
126 size_t count, loff_t *ppos)
127 {
128 char tmpbuf[TMPBUFLEN];
129 ssize_t length;
130
131 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
132 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
133 }
134
135 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
136 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
137 size_t count, loff_t *ppos)
138
139 {
140 char *page;
141 ssize_t length;
142 int new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146 if (*ppos != 0) {
147 /* No partial writes. */
148 return -EINVAL;
149 }
150 page = (char *)get_zeroed_page(GFP_KERNEL);
151 if (!page)
152 return -ENOMEM;
153 length = -EFAULT;
154 if (copy_from_user(page, buf, count))
155 goto out;
156
157 length = -EINVAL;
158 if (sscanf(page, "%d", &new_value) != 1)
159 goto out;
160
161 if (new_value != selinux_enforcing) {
162 length = task_has_security(current, SECURITY__SETENFORCE);
163 if (length)
164 goto out;
165 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
166 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
167 new_value, selinux_enforcing,
168 audit_get_loginuid(current),
169 audit_get_sessionid(current));
170 selinux_enforcing = new_value;
171 if (selinux_enforcing)
172 avc_ss_reset(0);
173 selnl_notify_setenforce(selinux_enforcing);
174 }
175 length = count;
176 out:
177 free_page((unsigned long) page);
178 return length;
179 }
180 #else
181 #define sel_write_enforce NULL
182 #endif
183
184 static const struct file_operations sel_enforce_ops = {
185 .read = sel_read_enforce,
186 .write = sel_write_enforce,
187 };
188
189 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
190 size_t count, loff_t *ppos)
191 {
192 char tmpbuf[TMPBUFLEN];
193 ssize_t length;
194 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
195 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
196 security_get_reject_unknown() : !security_get_allow_unknown();
197
198 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
199 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
200 }
201
202 static const struct file_operations sel_handle_unknown_ops = {
203 .read = sel_read_handle_unknown,
204 };
205
206 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
207 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
208 size_t count, loff_t *ppos)
209
210 {
211 char *page;
212 ssize_t length;
213 int new_value;
214 extern int selinux_disable(void);
215
216 if (count >= PAGE_SIZE)
217 return -ENOMEM;
218 if (*ppos != 0) {
219 /* No partial writes. */
220 return -EINVAL;
221 }
222 page = (char *)get_zeroed_page(GFP_KERNEL);
223 if (!page)
224 return -ENOMEM;
225 length = -EFAULT;
226 if (copy_from_user(page, buf, count))
227 goto out;
228
229 length = -EINVAL;
230 if (sscanf(page, "%d", &new_value) != 1)
231 goto out;
232
233 if (new_value) {
234 length = selinux_disable();
235 if (length < 0)
236 goto out;
237 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
238 "selinux=0 auid=%u ses=%u",
239 audit_get_loginuid(current),
240 audit_get_sessionid(current));
241 }
242
243 length = count;
244 out:
245 free_page((unsigned long) page);
246 return length;
247 }
248 #else
249 #define sel_write_disable NULL
250 #endif
251
252 static const struct file_operations sel_disable_ops = {
253 .write = sel_write_disable,
254 };
255
256 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
257 size_t count, loff_t *ppos)
258 {
259 char tmpbuf[TMPBUFLEN];
260 ssize_t length;
261
262 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
263 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
264 }
265
266 static const struct file_operations sel_policyvers_ops = {
267 .read = sel_read_policyvers,
268 };
269
270 /* declaration for sel_write_load */
271 static int sel_make_bools(void);
272 static int sel_make_classes(void);
273 static int sel_make_policycap(void);
274
275 /* declaration for sel_make_class_dirs */
276 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
277 unsigned long *ino);
278
279 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
280 size_t count, loff_t *ppos)
281 {
282 char tmpbuf[TMPBUFLEN];
283 ssize_t length;
284
285 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
286 security_mls_enabled());
287 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
288 }
289
290 static const struct file_operations sel_mls_ops = {
291 .read = sel_read_mls,
292 };
293
294 static ssize_t sel_write_load(struct file *file, const char __user *buf,
295 size_t count, loff_t *ppos)
296
297 {
298 int ret;
299 ssize_t length;
300 void *data = NULL;
301
302 mutex_lock(&sel_mutex);
303
304 length = task_has_security(current, SECURITY__LOAD_POLICY);
305 if (length)
306 goto out;
307
308 if (*ppos != 0) {
309 /* No partial writes. */
310 length = -EINVAL;
311 goto out;
312 }
313
314 if ((count > 64 * 1024 * 1024)
315 || (data = vmalloc(count)) == NULL) {
316 length = -ENOMEM;
317 goto out;
318 }
319
320 length = -EFAULT;
321 if (copy_from_user(data, buf, count) != 0)
322 goto out;
323
324 length = security_load_policy(data, count);
325 if (length)
326 goto out;
327
328 ret = sel_make_bools();
329 if (ret) {
330 length = ret;
331 goto out1;
332 }
333
334 ret = sel_make_classes();
335 if (ret) {
336 length = ret;
337 goto out1;
338 }
339
340 ret = sel_make_policycap();
341 if (ret)
342 length = ret;
343 else
344 length = count;
345
346 out1:
347 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
348 "policy loaded auid=%u ses=%u",
349 audit_get_loginuid(current),
350 audit_get_sessionid(current));
351 out:
352 mutex_unlock(&sel_mutex);
353 vfree(data);
354 return length;
355 }
356
357 static const struct file_operations sel_load_ops = {
358 .write = sel_write_load,
359 };
360
361 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
362 {
363 char *canon;
364 u32 sid, len;
365 ssize_t length;
366
367 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
368 if (length)
369 return length;
370
371 length = security_context_to_sid(buf, size, &sid);
372 if (length < 0)
373 return length;
374
375 length = security_sid_to_context(sid, &canon, &len);
376 if (length < 0)
377 return length;
378
379 if (len > SIMPLE_TRANSACTION_LIMIT) {
380 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
381 "payload max\n", __func__, len);
382 length = -ERANGE;
383 goto out;
384 }
385
386 memcpy(buf, canon, len);
387 length = len;
388 out:
389 kfree(canon);
390 return length;
391 }
392
393 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
394 size_t count, loff_t *ppos)
395 {
396 char tmpbuf[TMPBUFLEN];
397 ssize_t length;
398
399 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
400 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
401 }
402
403 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
404 size_t count, loff_t *ppos)
405 {
406 char *page;
407 ssize_t length;
408 unsigned int new_value;
409
410 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
411 if (length)
412 return length;
413
414 if (count >= PAGE_SIZE)
415 return -ENOMEM;
416 if (*ppos != 0) {
417 /* No partial writes. */
418 return -EINVAL;
419 }
420 page = (char *)get_zeroed_page(GFP_KERNEL);
421 if (!page)
422 return -ENOMEM;
423 length = -EFAULT;
424 if (copy_from_user(page, buf, count))
425 goto out;
426
427 length = -EINVAL;
428 if (sscanf(page, "%u", &new_value) != 1)
429 goto out;
430
431 selinux_checkreqprot = new_value ? 1 : 0;
432 length = count;
433 out:
434 free_page((unsigned long) page);
435 return length;
436 }
437 static const struct file_operations sel_checkreqprot_ops = {
438 .read = sel_read_checkreqprot,
439 .write = sel_write_checkreqprot,
440 };
441
442 /*
443 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
444 */
445 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
446 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
447 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
448 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
449 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
450
451 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
452 [SEL_ACCESS] = sel_write_access,
453 [SEL_CREATE] = sel_write_create,
454 [SEL_RELABEL] = sel_write_relabel,
455 [SEL_USER] = sel_write_user,
456 [SEL_MEMBER] = sel_write_member,
457 [SEL_CONTEXT] = sel_write_context,
458 };
459
460 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
461 {
462 ino_t ino = file->f_path.dentry->d_inode->i_ino;
463 char *data;
464 ssize_t rv;
465
466 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
467 return -EINVAL;
468
469 data = simple_transaction_get(file, buf, size);
470 if (IS_ERR(data))
471 return PTR_ERR(data);
472
473 rv = write_op[ino](file, data, size);
474 if (rv > 0) {
475 simple_transaction_set(file, rv);
476 rv = size;
477 }
478 return rv;
479 }
480
481 static const struct file_operations transaction_ops = {
482 .write = selinux_transaction_write,
483 .read = simple_transaction_read,
484 .release = simple_transaction_release,
485 };
486
487 /*
488 * payload - write methods
489 * If the method has a response, the response should be put in buf,
490 * and the length returned. Otherwise return 0 or and -error.
491 */
492
493 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
494 {
495 char *scon, *tcon;
496 u32 ssid, tsid;
497 u16 tclass;
498 struct av_decision avd;
499 ssize_t length;
500
501 length = task_has_security(current, SECURITY__COMPUTE_AV);
502 if (length)
503 return length;
504
505 length = -ENOMEM;
506 scon = kzalloc(size + 1, GFP_KERNEL);
507 if (!scon)
508 return length;
509
510 tcon = kzalloc(size + 1, GFP_KERNEL);
511 if (!tcon)
512 goto out;
513
514 length = -EINVAL;
515 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
516 goto out2;
517
518 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
519 if (length < 0)
520 goto out2;
521 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
522 if (length < 0)
523 goto out2;
524
525 security_compute_av_user(ssid, tsid, tclass, &avd);
526
527 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
528 "%x %x %x %x %u %x",
529 avd.allowed, 0xffffffff,
530 avd.auditallow, avd.auditdeny,
531 avd.seqno, avd.flags);
532 out2:
533 kfree(tcon);
534 out:
535 kfree(scon);
536 return length;
537 }
538
539 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
540 {
541 char *scon, *tcon;
542 u32 ssid, tsid, newsid;
543 u16 tclass;
544 ssize_t length;
545 char *newcon;
546 u32 len;
547
548 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
549 if (length)
550 return length;
551
552 length = -ENOMEM;
553 scon = kzalloc(size + 1, GFP_KERNEL);
554 if (!scon)
555 return length;
556
557 tcon = kzalloc(size + 1, GFP_KERNEL);
558 if (!tcon)
559 goto out;
560
561 length = -EINVAL;
562 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
563 goto out2;
564
565 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
566 if (length < 0)
567 goto out2;
568 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
569 if (length < 0)
570 goto out2;
571
572 length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
573 if (length < 0)
574 goto out2;
575
576 length = security_sid_to_context(newsid, &newcon, &len);
577 if (length < 0)
578 goto out2;
579
580 if (len > SIMPLE_TRANSACTION_LIMIT) {
581 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
582 "payload max\n", __func__, len);
583 length = -ERANGE;
584 goto out3;
585 }
586
587 memcpy(buf, newcon, len);
588 length = len;
589 out3:
590 kfree(newcon);
591 out2:
592 kfree(tcon);
593 out:
594 kfree(scon);
595 return length;
596 }
597
598 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
599 {
600 char *scon, *tcon;
601 u32 ssid, tsid, newsid;
602 u16 tclass;
603 ssize_t length;
604 char *newcon;
605 u32 len;
606
607 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
608 if (length)
609 return length;
610
611 length = -ENOMEM;
612 scon = kzalloc(size + 1, GFP_KERNEL);
613 if (!scon)
614 return length;
615
616 tcon = kzalloc(size + 1, GFP_KERNEL);
617 if (!tcon)
618 goto out;
619
620 length = -EINVAL;
621 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
622 goto out2;
623
624 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
625 if (length < 0)
626 goto out2;
627 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
628 if (length < 0)
629 goto out2;
630
631 length = security_change_sid(ssid, tsid, tclass, &newsid);
632 if (length < 0)
633 goto out2;
634
635 length = security_sid_to_context(newsid, &newcon, &len);
636 if (length < 0)
637 goto out2;
638
639 if (len > SIMPLE_TRANSACTION_LIMIT) {
640 length = -ERANGE;
641 goto out3;
642 }
643
644 memcpy(buf, newcon, len);
645 length = len;
646 out3:
647 kfree(newcon);
648 out2:
649 kfree(tcon);
650 out:
651 kfree(scon);
652 return length;
653 }
654
655 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
656 {
657 char *con, *user, *ptr;
658 u32 sid, *sids;
659 ssize_t length;
660 char *newcon;
661 int i, rc;
662 u32 len, nsids;
663
664 length = task_has_security(current, SECURITY__COMPUTE_USER);
665 if (length)
666 return length;
667
668 length = -ENOMEM;
669 con = kzalloc(size + 1, GFP_KERNEL);
670 if (!con)
671 return length;
672
673 user = kzalloc(size + 1, GFP_KERNEL);
674 if (!user)
675 goto out;
676
677 length = -EINVAL;
678 if (sscanf(buf, "%s %s", con, user) != 2)
679 goto out2;
680
681 length = security_context_to_sid(con, strlen(con) + 1, &sid);
682 if (length < 0)
683 goto out2;
684
685 length = security_get_user_sids(sid, user, &sids, &nsids);
686 if (length < 0)
687 goto out2;
688
689 length = sprintf(buf, "%u", nsids) + 1;
690 ptr = buf + length;
691 for (i = 0; i < nsids; i++) {
692 rc = security_sid_to_context(sids[i], &newcon, &len);
693 if (rc) {
694 length = rc;
695 goto out3;
696 }
697 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
698 kfree(newcon);
699 length = -ERANGE;
700 goto out3;
701 }
702 memcpy(ptr, newcon, len);
703 kfree(newcon);
704 ptr += len;
705 length += len;
706 }
707 out3:
708 kfree(sids);
709 out2:
710 kfree(user);
711 out:
712 kfree(con);
713 return length;
714 }
715
716 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
717 {
718 char *scon, *tcon;
719 u32 ssid, tsid, newsid;
720 u16 tclass;
721 ssize_t length;
722 char *newcon;
723 u32 len;
724
725 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
726 if (length)
727 return length;
728
729 length = -ENOMEM;
730 scon = kzalloc(size + 1, GFP_KERNEL);
731 if (!scon)
732 return length;
733
734 tcon = kzalloc(size + 1, GFP_KERNEL);
735 if (!tcon)
736 goto out;
737
738 length = -EINVAL;
739 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
740 goto out2;
741
742 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
743 if (length < 0)
744 goto out2;
745 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
746 if (length < 0)
747 goto out2;
748
749 length = security_member_sid(ssid, tsid, tclass, &newsid);
750 if (length < 0)
751 goto out2;
752
753 length = security_sid_to_context(newsid, &newcon, &len);
754 if (length < 0)
755 goto out2;
756
757 if (len > SIMPLE_TRANSACTION_LIMIT) {
758 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
759 "payload max\n", __func__, len);
760 length = -ERANGE;
761 goto out3;
762 }
763
764 memcpy(buf, newcon, len);
765 length = len;
766 out3:
767 kfree(newcon);
768 out2:
769 kfree(tcon);
770 out:
771 kfree(scon);
772 return length;
773 }
774
775 static struct inode *sel_make_inode(struct super_block *sb, int mode)
776 {
777 struct inode *ret = new_inode(sb);
778
779 if (ret) {
780 ret->i_mode = mode;
781 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
782 }
783 return ret;
784 }
785
786 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
787 size_t count, loff_t *ppos)
788 {
789 char *page = NULL;
790 ssize_t length;
791 ssize_t ret;
792 int cur_enforcing;
793 struct inode *inode = filep->f_path.dentry->d_inode;
794 unsigned index = inode->i_ino & SEL_INO_MASK;
795 const char *name = filep->f_path.dentry->d_name.name;
796
797 mutex_lock(&sel_mutex);
798
799 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
800 ret = -EINVAL;
801 goto out;
802 }
803
804 page = (char *)get_zeroed_page(GFP_KERNEL);
805 if (!page) {
806 ret = -ENOMEM;
807 goto out;
808 }
809
810 cur_enforcing = security_get_bool_value(index);
811 if (cur_enforcing < 0) {
812 ret = cur_enforcing;
813 goto out;
814 }
815 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
816 bool_pending_values[index]);
817 ret = simple_read_from_buffer(buf, count, ppos, page, length);
818 out:
819 mutex_unlock(&sel_mutex);
820 if (page)
821 free_page((unsigned long)page);
822 return ret;
823 }
824
825 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
826 size_t count, loff_t *ppos)
827 {
828 char *page = NULL;
829 ssize_t length;
830 int new_value;
831 struct inode *inode = filep->f_path.dentry->d_inode;
832 unsigned index = inode->i_ino & SEL_INO_MASK;
833 const char *name = filep->f_path.dentry->d_name.name;
834
835 mutex_lock(&sel_mutex);
836
837 length = task_has_security(current, SECURITY__SETBOOL);
838 if (length)
839 goto out;
840
841 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
842 length = -EINVAL;
843 goto out;
844 }
845
846 if (count >= PAGE_SIZE) {
847 length = -ENOMEM;
848 goto out;
849 }
850
851 if (*ppos != 0) {
852 /* No partial writes. */
853 length = -EINVAL;
854 goto out;
855 }
856 page = (char *)get_zeroed_page(GFP_KERNEL);
857 if (!page) {
858 length = -ENOMEM;
859 goto out;
860 }
861
862 length = -EFAULT;
863 if (copy_from_user(page, buf, count))
864 goto out;
865
866 length = -EINVAL;
867 if (sscanf(page, "%d", &new_value) != 1)
868 goto out;
869
870 if (new_value)
871 new_value = 1;
872
873 bool_pending_values[index] = new_value;
874 length = count;
875
876 out:
877 mutex_unlock(&sel_mutex);
878 if (page)
879 free_page((unsigned long) page);
880 return length;
881 }
882
883 static const struct file_operations sel_bool_ops = {
884 .read = sel_read_bool,
885 .write = sel_write_bool,
886 };
887
888 static ssize_t sel_commit_bools_write(struct file *filep,
889 const char __user *buf,
890 size_t count, loff_t *ppos)
891 {
892 char *page = NULL;
893 ssize_t length;
894 int new_value;
895
896 mutex_lock(&sel_mutex);
897
898 length = task_has_security(current, SECURITY__SETBOOL);
899 if (length)
900 goto out;
901
902 if (count >= PAGE_SIZE) {
903 length = -ENOMEM;
904 goto out;
905 }
906 if (*ppos != 0) {
907 /* No partial writes. */
908 goto out;
909 }
910 page = (char *)get_zeroed_page(GFP_KERNEL);
911 if (!page) {
912 length = -ENOMEM;
913 goto out;
914 }
915
916 length = -EFAULT;
917 if (copy_from_user(page, buf, count))
918 goto out;
919
920 length = -EINVAL;
921 if (sscanf(page, "%d", &new_value) != 1)
922 goto out;
923
924 if (new_value && bool_pending_values)
925 security_set_bools(bool_num, bool_pending_values);
926
927 length = count;
928
929 out:
930 mutex_unlock(&sel_mutex);
931 if (page)
932 free_page((unsigned long) page);
933 return length;
934 }
935
936 static const struct file_operations sel_commit_bools_ops = {
937 .write = sel_commit_bools_write,
938 };
939
940 static void sel_remove_entries(struct dentry *de)
941 {
942 struct list_head *node;
943
944 spin_lock(&dcache_lock);
945 node = de->d_subdirs.next;
946 while (node != &de->d_subdirs) {
947 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
948 list_del_init(node);
949
950 if (d->d_inode) {
951 d = dget_locked(d);
952 spin_unlock(&dcache_lock);
953 d_delete(d);
954 simple_unlink(de->d_inode, d);
955 dput(d);
956 spin_lock(&dcache_lock);
957 }
958 node = de->d_subdirs.next;
959 }
960
961 spin_unlock(&dcache_lock);
962 }
963
964 #define BOOL_DIR_NAME "booleans"
965
966 static int sel_make_bools(void)
967 {
968 int i, ret = 0;
969 ssize_t len;
970 struct dentry *dentry = NULL;
971 struct dentry *dir = bool_dir;
972 struct inode *inode = NULL;
973 struct inode_security_struct *isec;
974 char **names = NULL, *page;
975 int num;
976 int *values = NULL;
977 u32 sid;
978
979 /* remove any existing files */
980 for (i = 0; i < bool_num; i++)
981 kfree(bool_pending_names[i]);
982 kfree(bool_pending_names);
983 kfree(bool_pending_values);
984 bool_pending_names = NULL;
985 bool_pending_values = NULL;
986
987 sel_remove_entries(dir);
988
989 page = (char *)get_zeroed_page(GFP_KERNEL);
990 if (!page)
991 return -ENOMEM;
992
993 ret = security_get_bools(&num, &names, &values);
994 if (ret != 0)
995 goto out;
996
997 for (i = 0; i < num; i++) {
998 dentry = d_alloc_name(dir, names[i]);
999 if (!dentry) {
1000 ret = -ENOMEM;
1001 goto err;
1002 }
1003 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1004 if (!inode) {
1005 ret = -ENOMEM;
1006 goto err;
1007 }
1008
1009 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1010 if (len < 0) {
1011 ret = -EINVAL;
1012 goto err;
1013 } else if (len >= PAGE_SIZE) {
1014 ret = -ENAMETOOLONG;
1015 goto err;
1016 }
1017 isec = (struct inode_security_struct *)inode->i_security;
1018 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1019 if (ret)
1020 goto err;
1021 isec->sid = sid;
1022 isec->initialized = 1;
1023 inode->i_fop = &sel_bool_ops;
1024 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1025 d_add(dentry, inode);
1026 }
1027 bool_num = num;
1028 bool_pending_names = names;
1029 bool_pending_values = values;
1030 out:
1031 free_page((unsigned long)page);
1032 return ret;
1033 err:
1034 if (names) {
1035 for (i = 0; i < num; i++)
1036 kfree(names[i]);
1037 kfree(names);
1038 }
1039 kfree(values);
1040 sel_remove_entries(dir);
1041 ret = -ENOMEM;
1042 goto out;
1043 }
1044
1045 #define NULL_FILE_NAME "null"
1046
1047 struct dentry *selinux_null;
1048
1049 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1050 size_t count, loff_t *ppos)
1051 {
1052 char tmpbuf[TMPBUFLEN];
1053 ssize_t length;
1054
1055 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1056 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1057 }
1058
1059 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1060 const char __user *buf,
1061 size_t count, loff_t *ppos)
1062
1063 {
1064 char *page;
1065 ssize_t ret;
1066 int new_value;
1067
1068 if (count >= PAGE_SIZE) {
1069 ret = -ENOMEM;
1070 goto out;
1071 }
1072
1073 if (*ppos != 0) {
1074 /* No partial writes. */
1075 ret = -EINVAL;
1076 goto out;
1077 }
1078
1079 page = (char *)get_zeroed_page(GFP_KERNEL);
1080 if (!page) {
1081 ret = -ENOMEM;
1082 goto out;
1083 }
1084
1085 if (copy_from_user(page, buf, count)) {
1086 ret = -EFAULT;
1087 goto out_free;
1088 }
1089
1090 if (sscanf(page, "%u", &new_value) != 1) {
1091 ret = -EINVAL;
1092 goto out;
1093 }
1094
1095 if (new_value != avc_cache_threshold) {
1096 ret = task_has_security(current, SECURITY__SETSECPARAM);
1097 if (ret)
1098 goto out_free;
1099 avc_cache_threshold = new_value;
1100 }
1101 ret = count;
1102 out_free:
1103 free_page((unsigned long)page);
1104 out:
1105 return ret;
1106 }
1107
1108 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1109 size_t count, loff_t *ppos)
1110 {
1111 char *page;
1112 ssize_t ret = 0;
1113
1114 page = (char *)__get_free_page(GFP_KERNEL);
1115 if (!page) {
1116 ret = -ENOMEM;
1117 goto out;
1118 }
1119 ret = avc_get_hash_stats(page);
1120 if (ret >= 0)
1121 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1122 free_page((unsigned long)page);
1123 out:
1124 return ret;
1125 }
1126
1127 static const struct file_operations sel_avc_cache_threshold_ops = {
1128 .read = sel_read_avc_cache_threshold,
1129 .write = sel_write_avc_cache_threshold,
1130 };
1131
1132 static const struct file_operations sel_avc_hash_stats_ops = {
1133 .read = sel_read_avc_hash_stats,
1134 };
1135
1136 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1137 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1138 {
1139 int cpu;
1140
1141 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1142 if (!cpu_possible(cpu))
1143 continue;
1144 *idx = cpu + 1;
1145 return &per_cpu(avc_cache_stats, cpu);
1146 }
1147 return NULL;
1148 }
1149
1150 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1151 {
1152 loff_t n = *pos - 1;
1153
1154 if (*pos == 0)
1155 return SEQ_START_TOKEN;
1156
1157 return sel_avc_get_stat_idx(&n);
1158 }
1159
1160 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1161 {
1162 return sel_avc_get_stat_idx(pos);
1163 }
1164
1165 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1166 {
1167 struct avc_cache_stats *st = v;
1168
1169 if (v == SEQ_START_TOKEN)
1170 seq_printf(seq, "lookups hits misses allocations reclaims "
1171 "frees\n");
1172 else
1173 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1174 st->hits, st->misses, st->allocations,
1175 st->reclaims, st->frees);
1176 return 0;
1177 }
1178
1179 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1180 { }
1181
1182 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1183 .start = sel_avc_stats_seq_start,
1184 .next = sel_avc_stats_seq_next,
1185 .show = sel_avc_stats_seq_show,
1186 .stop = sel_avc_stats_seq_stop,
1187 };
1188
1189 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1190 {
1191 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1192 }
1193
1194 static const struct file_operations sel_avc_cache_stats_ops = {
1195 .open = sel_open_avc_cache_stats,
1196 .read = seq_read,
1197 .llseek = seq_lseek,
1198 .release = seq_release,
1199 };
1200 #endif
1201
1202 static int sel_make_avc_files(struct dentry *dir)
1203 {
1204 int i, ret = 0;
1205 static struct tree_descr files[] = {
1206 { "cache_threshold",
1207 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1208 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1209 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1210 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1211 #endif
1212 };
1213
1214 for (i = 0; i < ARRAY_SIZE(files); i++) {
1215 struct inode *inode;
1216 struct dentry *dentry;
1217
1218 dentry = d_alloc_name(dir, files[i].name);
1219 if (!dentry) {
1220 ret = -ENOMEM;
1221 goto out;
1222 }
1223
1224 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1225 if (!inode) {
1226 ret = -ENOMEM;
1227 goto out;
1228 }
1229 inode->i_fop = files[i].ops;
1230 inode->i_ino = ++sel_last_ino;
1231 d_add(dentry, inode);
1232 }
1233 out:
1234 return ret;
1235 }
1236
1237 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1238 size_t count, loff_t *ppos)
1239 {
1240 struct inode *inode;
1241 char *con;
1242 u32 sid, len;
1243 ssize_t ret;
1244
1245 inode = file->f_path.dentry->d_inode;
1246 sid = inode->i_ino&SEL_INO_MASK;
1247 ret = security_sid_to_context(sid, &con, &len);
1248 if (ret < 0)
1249 return ret;
1250
1251 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1252 kfree(con);
1253 return ret;
1254 }
1255
1256 static const struct file_operations sel_initcon_ops = {
1257 .read = sel_read_initcon,
1258 };
1259
1260 static int sel_make_initcon_files(struct dentry *dir)
1261 {
1262 int i, ret = 0;
1263
1264 for (i = 1; i <= SECINITSID_NUM; i++) {
1265 struct inode *inode;
1266 struct dentry *dentry;
1267 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1268 if (!dentry) {
1269 ret = -ENOMEM;
1270 goto out;
1271 }
1272
1273 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1274 if (!inode) {
1275 ret = -ENOMEM;
1276 goto out;
1277 }
1278 inode->i_fop = &sel_initcon_ops;
1279 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1280 d_add(dentry, inode);
1281 }
1282 out:
1283 return ret;
1284 }
1285
1286 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1287 {
1288 return a / b - (a % b < 0);
1289 }
1290
1291 static inline unsigned long sel_class_to_ino(u16 class)
1292 {
1293 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1294 }
1295
1296 static inline u16 sel_ino_to_class(unsigned long ino)
1297 {
1298 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1299 }
1300
1301 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1302 {
1303 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1304 }
1305
1306 static inline u32 sel_ino_to_perm(unsigned long ino)
1307 {
1308 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1309 }
1310
1311 static ssize_t sel_read_class(struct file *file, char __user *buf,
1312 size_t count, loff_t *ppos)
1313 {
1314 ssize_t rc, len;
1315 char *page;
1316 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1317
1318 page = (char *)__get_free_page(GFP_KERNEL);
1319 if (!page) {
1320 rc = -ENOMEM;
1321 goto out;
1322 }
1323
1324 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1325 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1326 free_page((unsigned long)page);
1327 out:
1328 return rc;
1329 }
1330
1331 static const struct file_operations sel_class_ops = {
1332 .read = sel_read_class,
1333 };
1334
1335 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1336 size_t count, loff_t *ppos)
1337 {
1338 ssize_t rc, len;
1339 char *page;
1340 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1341
1342 page = (char *)__get_free_page(GFP_KERNEL);
1343 if (!page) {
1344 rc = -ENOMEM;
1345 goto out;
1346 }
1347
1348 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1349 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1350 free_page((unsigned long)page);
1351 out:
1352 return rc;
1353 }
1354
1355 static const struct file_operations sel_perm_ops = {
1356 .read = sel_read_perm,
1357 };
1358
1359 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1360 size_t count, loff_t *ppos)
1361 {
1362 int value;
1363 char tmpbuf[TMPBUFLEN];
1364 ssize_t length;
1365 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1366
1367 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1368 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1369
1370 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1371 }
1372
1373 static const struct file_operations sel_policycap_ops = {
1374 .read = sel_read_policycap,
1375 };
1376
1377 static int sel_make_perm_files(char *objclass, int classvalue,
1378 struct dentry *dir)
1379 {
1380 int i, rc = 0, nperms;
1381 char **perms;
1382
1383 rc = security_get_permissions(objclass, &perms, &nperms);
1384 if (rc)
1385 goto out;
1386
1387 for (i = 0; i < nperms; i++) {
1388 struct inode *inode;
1389 struct dentry *dentry;
1390
1391 dentry = d_alloc_name(dir, perms[i]);
1392 if (!dentry) {
1393 rc = -ENOMEM;
1394 goto out1;
1395 }
1396
1397 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1398 if (!inode) {
1399 rc = -ENOMEM;
1400 goto out1;
1401 }
1402 inode->i_fop = &sel_perm_ops;
1403 /* i+1 since perm values are 1-indexed */
1404 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1405 d_add(dentry, inode);
1406 }
1407
1408 out1:
1409 for (i = 0; i < nperms; i++)
1410 kfree(perms[i]);
1411 kfree(perms);
1412 out:
1413 return rc;
1414 }
1415
1416 static int sel_make_class_dir_entries(char *classname, int index,
1417 struct dentry *dir)
1418 {
1419 struct dentry *dentry = NULL;
1420 struct inode *inode = NULL;
1421 int rc;
1422
1423 dentry = d_alloc_name(dir, "index");
1424 if (!dentry) {
1425 rc = -ENOMEM;
1426 goto out;
1427 }
1428
1429 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1430 if (!inode) {
1431 rc = -ENOMEM;
1432 goto out;
1433 }
1434
1435 inode->i_fop = &sel_class_ops;
1436 inode->i_ino = sel_class_to_ino(index);
1437 d_add(dentry, inode);
1438
1439 dentry = d_alloc_name(dir, "perms");
1440 if (!dentry) {
1441 rc = -ENOMEM;
1442 goto out;
1443 }
1444
1445 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1446 if (rc)
1447 goto out;
1448
1449 rc = sel_make_perm_files(classname, index, dentry);
1450
1451 out:
1452 return rc;
1453 }
1454
1455 static void sel_remove_classes(void)
1456 {
1457 struct list_head *class_node;
1458
1459 list_for_each(class_node, &class_dir->d_subdirs) {
1460 struct dentry *class_subdir = list_entry(class_node,
1461 struct dentry, d_u.d_child);
1462 struct list_head *class_subdir_node;
1463
1464 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1465 struct dentry *d = list_entry(class_subdir_node,
1466 struct dentry, d_u.d_child);
1467
1468 if (d->d_inode)
1469 if (d->d_inode->i_mode & S_IFDIR)
1470 sel_remove_entries(d);
1471 }
1472
1473 sel_remove_entries(class_subdir);
1474 }
1475
1476 sel_remove_entries(class_dir);
1477 }
1478
1479 static int sel_make_classes(void)
1480 {
1481 int rc = 0, nclasses, i;
1482 char **classes;
1483
1484 /* delete any existing entries */
1485 sel_remove_classes();
1486
1487 rc = security_get_classes(&classes, &nclasses);
1488 if (rc < 0)
1489 goto out;
1490
1491 /* +2 since classes are 1-indexed */
1492 last_class_ino = sel_class_to_ino(nclasses + 2);
1493
1494 for (i = 0; i < nclasses; i++) {
1495 struct dentry *class_name_dir;
1496
1497 class_name_dir = d_alloc_name(class_dir, classes[i]);
1498 if (!class_name_dir) {
1499 rc = -ENOMEM;
1500 goto out1;
1501 }
1502
1503 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1504 &last_class_ino);
1505 if (rc)
1506 goto out1;
1507
1508 /* i+1 since class values are 1-indexed */
1509 rc = sel_make_class_dir_entries(classes[i], i + 1,
1510 class_name_dir);
1511 if (rc)
1512 goto out1;
1513 }
1514
1515 out1:
1516 for (i = 0; i < nclasses; i++)
1517 kfree(classes[i]);
1518 kfree(classes);
1519 out:
1520 return rc;
1521 }
1522
1523 static int sel_make_policycap(void)
1524 {
1525 unsigned int iter;
1526 struct dentry *dentry = NULL;
1527 struct inode *inode = NULL;
1528
1529 sel_remove_entries(policycap_dir);
1530
1531 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1532 if (iter < ARRAY_SIZE(policycap_names))
1533 dentry = d_alloc_name(policycap_dir,
1534 policycap_names[iter]);
1535 else
1536 dentry = d_alloc_name(policycap_dir, "unknown");
1537
1538 if (dentry == NULL)
1539 return -ENOMEM;
1540
1541 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1542 if (inode == NULL)
1543 return -ENOMEM;
1544
1545 inode->i_fop = &sel_policycap_ops;
1546 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1547 d_add(dentry, inode);
1548 }
1549
1550 return 0;
1551 }
1552
1553 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1554 unsigned long *ino)
1555 {
1556 int ret = 0;
1557 struct inode *inode;
1558
1559 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1560 if (!inode) {
1561 ret = -ENOMEM;
1562 goto out;
1563 }
1564 inode->i_op = &simple_dir_inode_operations;
1565 inode->i_fop = &simple_dir_operations;
1566 inode->i_ino = ++(*ino);
1567 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1568 inc_nlink(inode);
1569 d_add(dentry, inode);
1570 /* bump link count on parent directory, too */
1571 inc_nlink(dir);
1572 out:
1573 return ret;
1574 }
1575
1576 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1577 {
1578 int ret;
1579 struct dentry *dentry;
1580 struct inode *inode, *root_inode;
1581 struct inode_security_struct *isec;
1582
1583 static struct tree_descr selinux_files[] = {
1584 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1585 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1586 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1587 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1588 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1589 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1590 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1591 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1592 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1593 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1594 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1595 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1596 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1597 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1598 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1599 /* last one */ {""}
1600 };
1601 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1602 if (ret)
1603 goto err;
1604
1605 root_inode = sb->s_root->d_inode;
1606
1607 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1608 if (!dentry) {
1609 ret = -ENOMEM;
1610 goto err;
1611 }
1612
1613 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1614 if (ret)
1615 goto err;
1616
1617 bool_dir = dentry;
1618
1619 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1620 if (!dentry) {
1621 ret = -ENOMEM;
1622 goto err;
1623 }
1624
1625 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1626 if (!inode) {
1627 ret = -ENOMEM;
1628 goto err;
1629 }
1630 inode->i_ino = ++sel_last_ino;
1631 isec = (struct inode_security_struct *)inode->i_security;
1632 isec->sid = SECINITSID_DEVNULL;
1633 isec->sclass = SECCLASS_CHR_FILE;
1634 isec->initialized = 1;
1635
1636 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1637 d_add(dentry, inode);
1638 selinux_null = dentry;
1639
1640 dentry = d_alloc_name(sb->s_root, "avc");
1641 if (!dentry) {
1642 ret = -ENOMEM;
1643 goto err;
1644 }
1645
1646 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1647 if (ret)
1648 goto err;
1649
1650 ret = sel_make_avc_files(dentry);
1651 if (ret)
1652 goto err;
1653
1654 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1655 if (!dentry) {
1656 ret = -ENOMEM;
1657 goto err;
1658 }
1659
1660 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1661 if (ret)
1662 goto err;
1663
1664 ret = sel_make_initcon_files(dentry);
1665 if (ret)
1666 goto err;
1667
1668 dentry = d_alloc_name(sb->s_root, "class");
1669 if (!dentry) {
1670 ret = -ENOMEM;
1671 goto err;
1672 }
1673
1674 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1675 if (ret)
1676 goto err;
1677
1678 class_dir = dentry;
1679
1680 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1681 if (!dentry) {
1682 ret = -ENOMEM;
1683 goto err;
1684 }
1685
1686 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1687 if (ret)
1688 goto err;
1689
1690 policycap_dir = dentry;
1691
1692 out:
1693 return ret;
1694 err:
1695 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1696 __func__);
1697 goto out;
1698 }
1699
1700 static int sel_get_sb(struct file_system_type *fs_type,
1701 int flags, const char *dev_name, void *data,
1702 struct vfsmount *mnt)
1703 {
1704 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1705 }
1706
1707 static struct file_system_type sel_fs_type = {
1708 .name = "selinuxfs",
1709 .get_sb = sel_get_sb,
1710 .kill_sb = kill_litter_super,
1711 };
1712
1713 struct vfsmount *selinuxfs_mount;
1714
1715 static int __init init_sel_fs(void)
1716 {
1717 int err;
1718
1719 if (!selinux_enabled)
1720 return 0;
1721 err = register_filesystem(&sel_fs_type);
1722 if (!err) {
1723 selinuxfs_mount = kern_mount(&sel_fs_type);
1724 if (IS_ERR(selinuxfs_mount)) {
1725 printk(KERN_ERR "selinuxfs: could not mount!\n");
1726 err = PTR_ERR(selinuxfs_mount);
1727 selinuxfs_mount = NULL;
1728 }
1729 }
1730 return err;
1731 }
1732
1733 __initcall(init_sel_fs);
1734
1735 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1736 void exit_sel_fs(void)
1737 {
1738 unregister_filesystem(&sel_fs_type);
1739 }
1740 #endif
linux-next