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[IPV6]: ROUTE: Split up rt6_cow() for future changes.
[linux-2.6/verdex.git] / security / selinux / selinuxfs.c
blobb5fa02d17b1eae8ff3a863ec8520fae951b1de12
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
6 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, version 2.
10 */
11
12 #include <linux/config.h>
13 #include <linux/kernel.h>
14 #include <linux/pagemap.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/string.h>
20 #include <linux/security.h>
21 #include <linux/major.h>
22 #include <linux/seq_file.h>
23 #include <linux/percpu.h>
24 #include <asm/uaccess.h>
25 #include <asm/semaphore.h>
26
27 /* selinuxfs pseudo filesystem for exporting the security policy API.
28 Based on the proc code and the fs/nfsd/nfsctl.c code. */
29
30 #include "flask.h"
31 #include "avc.h"
32 #include "avc_ss.h"
33 #include "security.h"
34 #include "objsec.h"
35 #include "conditional.h"
36
37 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
38
39 static int __init checkreqprot_setup(char *str)
40 {
41 selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
42 return 1;
43 }
44 __setup("checkreqprot=", checkreqprot_setup);
45
46
47 static DECLARE_MUTEX(sel_sem);
48
49 /* global data for booleans */
50 static struct dentry *bool_dir = NULL;
51 static int bool_num = 0;
52 static int *bool_pending_values = NULL;
53
54 extern void selnl_notify_setenforce(int val);
55
56 /* Check whether a task is allowed to use a security operation. */
57 static int task_has_security(struct task_struct *tsk,
58 u32 perms)
59 {
60 struct task_security_struct *tsec;
61
62 tsec = tsk->security;
63 if (!tsec)
64 return -EACCES;
65
66 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
67 SECCLASS_SECURITY, perms, NULL);
68 }
69
70 enum sel_inos {
71 SEL_ROOT_INO = 2,
72 SEL_LOAD, /* load policy */
73 SEL_ENFORCE, /* get or set enforcing status */
74 SEL_CONTEXT, /* validate context */
75 SEL_ACCESS, /* compute access decision */
76 SEL_CREATE, /* compute create labeling decision */
77 SEL_RELABEL, /* compute relabeling decision */
78 SEL_USER, /* compute reachable user contexts */
79 SEL_POLICYVERS, /* return policy version for this kernel */
80 SEL_COMMIT_BOOLS, /* commit new boolean values */
81 SEL_MLS, /* return if MLS policy is enabled */
82 SEL_DISABLE, /* disable SELinux until next reboot */
83 SEL_AVC, /* AVC management directory */
84 SEL_MEMBER, /* compute polyinstantiation membership decision */
85 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
86 };
87
88 #define TMPBUFLEN 12
89 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
90 size_t count, loff_t *ppos)
91 {
92 char tmpbuf[TMPBUFLEN];
93 ssize_t length;
94
95 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
96 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
97 }
98
99 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
100 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
101 size_t count, loff_t *ppos)
102
103 {
104 char *page;
105 ssize_t length;
106 int new_value;
107
108 if (count >= PAGE_SIZE)
109 return -ENOMEM;
110 if (*ppos != 0) {
111 /* No partial writes. */
112 return -EINVAL;
113 }
114 page = (char*)get_zeroed_page(GFP_KERNEL);
115 if (!page)
116 return -ENOMEM;
117 length = -EFAULT;
118 if (copy_from_user(page, buf, count))
119 goto out;
120
121 length = -EINVAL;
122 if (sscanf(page, "%d", &new_value) != 1)
123 goto out;
124
125 if (new_value != selinux_enforcing) {
126 length = task_has_security(current, SECURITY__SETENFORCE);
127 if (length)
128 goto out;
129 selinux_enforcing = new_value;
130 if (selinux_enforcing)
131 avc_ss_reset(0);
132 selnl_notify_setenforce(selinux_enforcing);
133 }
134 length = count;
135 out:
136 free_page((unsigned long) page);
137 return length;
138 }
139 #else
140 #define sel_write_enforce NULL
141 #endif
142
143 static struct file_operations sel_enforce_ops = {
144 .read = sel_read_enforce,
145 .write = sel_write_enforce,
146 };
147
148 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
149 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
150 size_t count, loff_t *ppos)
151
152 {
153 char *page;
154 ssize_t length;
155 int new_value;
156 extern int selinux_disable(void);
157
158 if (count >= PAGE_SIZE)
159 return -ENOMEM;
160 if (*ppos != 0) {
161 /* No partial writes. */
162 return -EINVAL;
163 }
164 page = (char*)get_zeroed_page(GFP_KERNEL);
165 if (!page)
166 return -ENOMEM;
167 length = -EFAULT;
168 if (copy_from_user(page, buf, count))
169 goto out;
170
171 length = -EINVAL;
172 if (sscanf(page, "%d", &new_value) != 1)
173 goto out;
174
175 if (new_value) {
176 length = selinux_disable();
177 if (length < 0)
178 goto out;
179 }
180
181 length = count;
182 out:
183 free_page((unsigned long) page);
184 return length;
185 }
186 #else
187 #define sel_write_disable NULL
188 #endif
189
190 static struct file_operations sel_disable_ops = {
191 .write = sel_write_disable,
192 };
193
194 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
195 size_t count, loff_t *ppos)
196 {
197 char tmpbuf[TMPBUFLEN];
198 ssize_t length;
199
200 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
201 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
202 }
203
204 static struct file_operations sel_policyvers_ops = {
205 .read = sel_read_policyvers,
206 };
207
208 /* declaration for sel_write_load */
209 static int sel_make_bools(void);
210
211 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
212 size_t count, loff_t *ppos)
213 {
214 char tmpbuf[TMPBUFLEN];
215 ssize_t length;
216
217 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
218 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
219 }
220
221 static struct file_operations sel_mls_ops = {
222 .read = sel_read_mls,
223 };
224
225 static ssize_t sel_write_load(struct file * file, const char __user * buf,
226 size_t count, loff_t *ppos)
227
228 {
229 int ret;
230 ssize_t length;
231 void *data = NULL;
232
233 down(&sel_sem);
234
235 length = task_has_security(current, SECURITY__LOAD_POLICY);
236 if (length)
237 goto out;
238
239 if (*ppos != 0) {
240 /* No partial writes. */
241 length = -EINVAL;
242 goto out;
243 }
244
245 if ((count > 64 * 1024 * 1024)
246 || (data = vmalloc(count)) == NULL) {
247 length = -ENOMEM;
248 goto out;
249 }
250
251 length = -EFAULT;
252 if (copy_from_user(data, buf, count) != 0)
253 goto out;
254
255 length = security_load_policy(data, count);
256 if (length)
257 goto out;
258
259 ret = sel_make_bools();
260 if (ret)
261 length = ret;
262 else
263 length = count;
264 out:
265 up(&sel_sem);
266 vfree(data);
267 return length;
268 }
269
270 static struct file_operations sel_load_ops = {
271 .write = sel_write_load,
272 };
273
274 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
275 {
276 char *canon;
277 u32 sid, len;
278 ssize_t length;
279
280 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
281 if (length)
282 return length;
283
284 length = security_context_to_sid(buf, size, &sid);
285 if (length < 0)
286 return length;
287
288 length = security_sid_to_context(sid, &canon, &len);
289 if (length < 0)
290 return length;
291
292 if (len > SIMPLE_TRANSACTION_LIMIT) {
293 printk(KERN_ERR "%s: context size (%u) exceeds payload "
294 "max\n", __FUNCTION__, len);
295 length = -ERANGE;
296 goto out;
297 }
298
299 memcpy(buf, canon, len);
300 length = len;
301 out:
302 kfree(canon);
303 return length;
304 }
305
306 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
307 size_t count, loff_t *ppos)
308 {
309 char tmpbuf[TMPBUFLEN];
310 ssize_t length;
311
312 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
313 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
314 }
315
316 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
317 size_t count, loff_t *ppos)
318 {
319 char *page;
320 ssize_t length;
321 unsigned int new_value;
322
323 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
324 if (length)
325 return length;
326
327 if (count >= PAGE_SIZE)
328 return -ENOMEM;
329 if (*ppos != 0) {
330 /* No partial writes. */
331 return -EINVAL;
332 }
333 page = (char*)get_zeroed_page(GFP_KERNEL);
334 if (!page)
335 return -ENOMEM;
336 length = -EFAULT;
337 if (copy_from_user(page, buf, count))
338 goto out;
339
340 length = -EINVAL;
341 if (sscanf(page, "%u", &new_value) != 1)
342 goto out;
343
344 selinux_checkreqprot = new_value ? 1 : 0;
345 length = count;
346 out:
347 free_page((unsigned long) page);
348 return length;
349 }
350 static struct file_operations sel_checkreqprot_ops = {
351 .read = sel_read_checkreqprot,
352 .write = sel_write_checkreqprot,
353 };
354
355 /*
356 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
357 */
358 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
359 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
360 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
361 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
362 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
363
364 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
365 [SEL_ACCESS] = sel_write_access,
366 [SEL_CREATE] = sel_write_create,
367 [SEL_RELABEL] = sel_write_relabel,
368 [SEL_USER] = sel_write_user,
369 [SEL_MEMBER] = sel_write_member,
370 [SEL_CONTEXT] = sel_write_context,
371 };
372
373 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
374 {
375 ino_t ino = file->f_dentry->d_inode->i_ino;
376 char *data;
377 ssize_t rv;
378
379 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
380 return -EINVAL;
381
382 data = simple_transaction_get(file, buf, size);
383 if (IS_ERR(data))
384 return PTR_ERR(data);
385
386 rv = write_op[ino](file, data, size);
387 if (rv>0) {
388 simple_transaction_set(file, rv);
389 rv = size;
390 }
391 return rv;
392 }
393
394 static struct file_operations transaction_ops = {
395 .write = selinux_transaction_write,
396 .read = simple_transaction_read,
397 .release = simple_transaction_release,
398 };
399
400 /*
401 * payload - write methods
402 * If the method has a response, the response should be put in buf,
403 * and the length returned. Otherwise return 0 or and -error.
404 */
405
406 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
407 {
408 char *scon, *tcon;
409 u32 ssid, tsid;
410 u16 tclass;
411 u32 req;
412 struct av_decision avd;
413 ssize_t length;
414
415 length = task_has_security(current, SECURITY__COMPUTE_AV);
416 if (length)
417 return length;
418
419 length = -ENOMEM;
420 scon = kzalloc(size+1, GFP_KERNEL);
421 if (!scon)
422 return length;
423
424 tcon = kzalloc(size+1, GFP_KERNEL);
425 if (!tcon)
426 goto out;
427
428 length = -EINVAL;
429 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
430 goto out2;
431
432 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
433 if (length < 0)
434 goto out2;
435 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
436 if (length < 0)
437 goto out2;
438
439 length = security_compute_av(ssid, tsid, tclass, req, &avd);
440 if (length < 0)
441 goto out2;
442
443 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
444 "%x %x %x %x %u",
445 avd.allowed, avd.decided,
446 avd.auditallow, avd.auditdeny,
447 avd.seqno);
448 out2:
449 kfree(tcon);
450 out:
451 kfree(scon);
452 return length;
453 }
454
455 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
456 {
457 char *scon, *tcon;
458 u32 ssid, tsid, newsid;
459 u16 tclass;
460 ssize_t length;
461 char *newcon;
462 u32 len;
463
464 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
465 if (length)
466 return length;
467
468 length = -ENOMEM;
469 scon = kzalloc(size+1, GFP_KERNEL);
470 if (!scon)
471 return length;
472
473 tcon = kzalloc(size+1, GFP_KERNEL);
474 if (!tcon)
475 goto out;
476
477 length = -EINVAL;
478 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
479 goto out2;
480
481 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
482 if (length < 0)
483 goto out2;
484 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
485 if (length < 0)
486 goto out2;
487
488 length = security_transition_sid(ssid, tsid, tclass, &newsid);
489 if (length < 0)
490 goto out2;
491
492 length = security_sid_to_context(newsid, &newcon, &len);
493 if (length < 0)
494 goto out2;
495
496 if (len > SIMPLE_TRANSACTION_LIMIT) {
497 printk(KERN_ERR "%s: context size (%u) exceeds payload "
498 "max\n", __FUNCTION__, len);
499 length = -ERANGE;
500 goto out3;
501 }
502
503 memcpy(buf, newcon, len);
504 length = len;
505 out3:
506 kfree(newcon);
507 out2:
508 kfree(tcon);
509 out:
510 kfree(scon);
511 return length;
512 }
513
514 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
515 {
516 char *scon, *tcon;
517 u32 ssid, tsid, newsid;
518 u16 tclass;
519 ssize_t length;
520 char *newcon;
521 u32 len;
522
523 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
524 if (length)
525 return length;
526
527 length = -ENOMEM;
528 scon = kzalloc(size+1, GFP_KERNEL);
529 if (!scon)
530 return length;
531
532 tcon = kzalloc(size+1, GFP_KERNEL);
533 if (!tcon)
534 goto out;
535
536 length = -EINVAL;
537 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
538 goto out2;
539
540 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
541 if (length < 0)
542 goto out2;
543 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
544 if (length < 0)
545 goto out2;
546
547 length = security_change_sid(ssid, tsid, tclass, &newsid);
548 if (length < 0)
549 goto out2;
550
551 length = security_sid_to_context(newsid, &newcon, &len);
552 if (length < 0)
553 goto out2;
554
555 if (len > SIMPLE_TRANSACTION_LIMIT) {
556 length = -ERANGE;
557 goto out3;
558 }
559
560 memcpy(buf, newcon, len);
561 length = len;
562 out3:
563 kfree(newcon);
564 out2:
565 kfree(tcon);
566 out:
567 kfree(scon);
568 return length;
569 }
570
571 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
572 {
573 char *con, *user, *ptr;
574 u32 sid, *sids;
575 ssize_t length;
576 char *newcon;
577 int i, rc;
578 u32 len, nsids;
579
580 length = task_has_security(current, SECURITY__COMPUTE_USER);
581 if (length)
582 return length;
583
584 length = -ENOMEM;
585 con = kzalloc(size+1, GFP_KERNEL);
586 if (!con)
587 return length;
588
589 user = kzalloc(size+1, GFP_KERNEL);
590 if (!user)
591 goto out;
592
593 length = -EINVAL;
594 if (sscanf(buf, "%s %s", con, user) != 2)
595 goto out2;
596
597 length = security_context_to_sid(con, strlen(con)+1, &sid);
598 if (length < 0)
599 goto out2;
600
601 length = security_get_user_sids(sid, user, &sids, &nsids);
602 if (length < 0)
603 goto out2;
604
605 length = sprintf(buf, "%u", nsids) + 1;
606 ptr = buf + length;
607 for (i = 0; i < nsids; i++) {
608 rc = security_sid_to_context(sids[i], &newcon, &len);
609 if (rc) {
610 length = rc;
611 goto out3;
612 }
613 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
614 kfree(newcon);
615 length = -ERANGE;
616 goto out3;
617 }
618 memcpy(ptr, newcon, len);
619 kfree(newcon);
620 ptr += len;
621 length += len;
622 }
623 out3:
624 kfree(sids);
625 out2:
626 kfree(user);
627 out:
628 kfree(con);
629 return length;
630 }
631
632 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
633 {
634 char *scon, *tcon;
635 u32 ssid, tsid, newsid;
636 u16 tclass;
637 ssize_t length;
638 char *newcon;
639 u32 len;
640
641 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
642 if (length)
643 return length;
644
645 length = -ENOMEM;
646 scon = kzalloc(size+1, GFP_KERNEL);
647 if (!scon)
648 return length;
649
650 tcon = kzalloc(size+1, GFP_KERNEL);
651 if (!tcon)
652 goto out;
653
654 length = -EINVAL;
655 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
656 goto out2;
657
658 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
659 if (length < 0)
660 goto out2;
661 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
662 if (length < 0)
663 goto out2;
664
665 length = security_member_sid(ssid, tsid, tclass, &newsid);
666 if (length < 0)
667 goto out2;
668
669 length = security_sid_to_context(newsid, &newcon, &len);
670 if (length < 0)
671 goto out2;
672
673 if (len > SIMPLE_TRANSACTION_LIMIT) {
674 printk(KERN_ERR "%s: context size (%u) exceeds payload "
675 "max\n", __FUNCTION__, len);
676 length = -ERANGE;
677 goto out3;
678 }
679
680 memcpy(buf, newcon, len);
681 length = len;
682 out3:
683 kfree(newcon);
684 out2:
685 kfree(tcon);
686 out:
687 kfree(scon);
688 return length;
689 }
690
691 static struct inode *sel_make_inode(struct super_block *sb, int mode)
692 {
693 struct inode *ret = new_inode(sb);
694
695 if (ret) {
696 ret->i_mode = mode;
697 ret->i_uid = ret->i_gid = 0;
698 ret->i_blksize = PAGE_CACHE_SIZE;
699 ret->i_blocks = 0;
700 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
701 }
702 return ret;
703 }
704
705 #define BOOL_INO_OFFSET 30
706
707 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
708 size_t count, loff_t *ppos)
709 {
710 char *page = NULL;
711 ssize_t length;
712 ssize_t end;
713 ssize_t ret;
714 int cur_enforcing;
715 struct inode *inode;
716
717 down(&sel_sem);
718
719 ret = -EFAULT;
720
721 /* check to see if this file has been deleted */
722 if (!filep->f_op)
723 goto out;
724
725 if (count > PAGE_SIZE) {
726 ret = -EINVAL;
727 goto out;
728 }
729 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
730 ret = -ENOMEM;
731 goto out;
732 }
733
734 inode = filep->f_dentry->d_inode;
735 cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
736 if (cur_enforcing < 0) {
737 ret = cur_enforcing;
738 goto out;
739 }
740
741 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
742 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
743 if (length < 0) {
744 ret = length;
745 goto out;
746 }
747
748 if (*ppos >= length) {
749 ret = 0;
750 goto out;
751 }
752 if (count + *ppos > length)
753 count = length - *ppos;
754 end = count + *ppos;
755 if (copy_to_user(buf, (char *) page + *ppos, count)) {
756 ret = -EFAULT;
757 goto out;
758 }
759 *ppos = end;
760 ret = count;
761 out:
762 up(&sel_sem);
763 if (page)
764 free_page((unsigned long)page);
765 return ret;
766 }
767
768 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
769 size_t count, loff_t *ppos)
770 {
771 char *page = NULL;
772 ssize_t length = -EFAULT;
773 int new_value;
774 struct inode *inode;
775
776 down(&sel_sem);
777
778 length = task_has_security(current, SECURITY__SETBOOL);
779 if (length)
780 goto out;
781
782 /* check to see if this file has been deleted */
783 if (!filep->f_op)
784 goto out;
785
786 if (count >= PAGE_SIZE) {
787 length = -ENOMEM;
788 goto out;
789 }
790 if (*ppos != 0) {
791 /* No partial writes. */
792 goto out;
793 }
794 page = (char*)get_zeroed_page(GFP_KERNEL);
795 if (!page) {
796 length = -ENOMEM;
797 goto out;
798 }
799
800 if (copy_from_user(page, buf, count))
801 goto out;
802
803 length = -EINVAL;
804 if (sscanf(page, "%d", &new_value) != 1)
805 goto out;
806
807 if (new_value)
808 new_value = 1;
809
810 inode = filep->f_dentry->d_inode;
811 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
812 length = count;
813
814 out:
815 up(&sel_sem);
816 if (page)
817 free_page((unsigned long) page);
818 return length;
819 }
820
821 static struct file_operations sel_bool_ops = {
822 .read = sel_read_bool,
823 .write = sel_write_bool,
824 };
825
826 static ssize_t sel_commit_bools_write(struct file *filep,
827 const char __user *buf,
828 size_t count, loff_t *ppos)
829 {
830 char *page = NULL;
831 ssize_t length = -EFAULT;
832 int new_value;
833
834 down(&sel_sem);
835
836 length = task_has_security(current, SECURITY__SETBOOL);
837 if (length)
838 goto out;
839
840 /* check to see if this file has been deleted */
841 if (!filep->f_op)
842 goto out;
843
844 if (count >= PAGE_SIZE) {
845 length = -ENOMEM;
846 goto out;
847 }
848 if (*ppos != 0) {
849 /* No partial writes. */
850 goto out;
851 }
852 page = (char*)get_zeroed_page(GFP_KERNEL);
853 if (!page) {
854 length = -ENOMEM;
855 goto out;
856 }
857
858 if (copy_from_user(page, buf, count))
859 goto out;
860
861 length = -EINVAL;
862 if (sscanf(page, "%d", &new_value) != 1)
863 goto out;
864
865 if (new_value && bool_pending_values) {
866 security_set_bools(bool_num, bool_pending_values);
867 }
868
869 length = count;
870
871 out:
872 up(&sel_sem);
873 if (page)
874 free_page((unsigned long) page);
875 return length;
876 }
877
878 static struct file_operations sel_commit_bools_ops = {
879 .write = sel_commit_bools_write,
880 };
881
882 /* delete booleans - partial revoke() from
883 * fs/proc/generic.c proc_kill_inodes */
884 static void sel_remove_bools(struct dentry *de)
885 {
886 struct list_head *p, *node;
887 struct super_block *sb = de->d_sb;
888
889 spin_lock(&dcache_lock);
890 node = de->d_subdirs.next;
891 while (node != &de->d_subdirs) {
892 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
893 list_del_init(node);
894
895 if (d->d_inode) {
896 d = dget_locked(d);
897 spin_unlock(&dcache_lock);
898 d_delete(d);
899 simple_unlink(de->d_inode, d);
900 dput(d);
901 spin_lock(&dcache_lock);
902 }
903 node = de->d_subdirs.next;
904 }
905
906 spin_unlock(&dcache_lock);
907
908 file_list_lock();
909 list_for_each(p, &sb->s_files) {
910 struct file * filp = list_entry(p, struct file, f_u.fu_list);
911 struct dentry * dentry = filp->f_dentry;
912
913 if (dentry->d_parent != de) {
914 continue;
915 }
916 filp->f_op = NULL;
917 }
918 file_list_unlock();
919 }
920
921 #define BOOL_DIR_NAME "booleans"
922
923 static int sel_make_bools(void)
924 {
925 int i, ret = 0;
926 ssize_t len;
927 struct dentry *dentry = NULL;
928 struct dentry *dir = bool_dir;
929 struct inode *inode = NULL;
930 struct inode_security_struct *isec;
931 char **names = NULL, *page;
932 int num;
933 int *values = NULL;
934 u32 sid;
935
936 /* remove any existing files */
937 kfree(bool_pending_values);
938 bool_pending_values = NULL;
939
940 sel_remove_bools(dir);
941
942 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
943 return -ENOMEM;
944
945 ret = security_get_bools(&num, &names, &values);
946 if (ret != 0)
947 goto out;
948
949 for (i = 0; i < num; i++) {
950 dentry = d_alloc_name(dir, names[i]);
951 if (!dentry) {
952 ret = -ENOMEM;
953 goto err;
954 }
955 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
956 if (!inode) {
957 ret = -ENOMEM;
958 goto err;
959 }
960
961 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
962 if (len < 0) {
963 ret = -EINVAL;
964 goto err;
965 } else if (len >= PAGE_SIZE) {
966 ret = -ENAMETOOLONG;
967 goto err;
968 }
969 isec = (struct inode_security_struct*)inode->i_security;
970 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
971 goto err;
972 isec->sid = sid;
973 isec->initialized = 1;
974 inode->i_fop = &sel_bool_ops;
975 inode->i_ino = i + BOOL_INO_OFFSET;
976 d_add(dentry, inode);
977 }
978 bool_num = num;
979 bool_pending_values = values;
980 out:
981 free_page((unsigned long)page);
982 if (names) {
983 for (i = 0; i < num; i++)
984 kfree(names[i]);
985 kfree(names);
986 }
987 return ret;
988 err:
989 kfree(values);
990 d_genocide(dir);
991 ret = -ENOMEM;
992 goto out;
993 }
994
995 #define NULL_FILE_NAME "null"
996
997 struct dentry *selinux_null = NULL;
998
999 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1000 size_t count, loff_t *ppos)
1001 {
1002 char tmpbuf[TMPBUFLEN];
1003 ssize_t length;
1004
1005 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1006 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1007 }
1008
1009 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1010 const char __user * buf,
1011 size_t count, loff_t *ppos)
1012
1013 {
1014 char *page;
1015 ssize_t ret;
1016 int new_value;
1017
1018 if (count >= PAGE_SIZE) {
1019 ret = -ENOMEM;
1020 goto out;
1021 }
1022
1023 if (*ppos != 0) {
1024 /* No partial writes. */
1025 ret = -EINVAL;
1026 goto out;
1027 }
1028
1029 page = (char*)get_zeroed_page(GFP_KERNEL);
1030 if (!page) {
1031 ret = -ENOMEM;
1032 goto out;
1033 }
1034
1035 if (copy_from_user(page, buf, count)) {
1036 ret = -EFAULT;
1037 goto out_free;
1038 }
1039
1040 if (sscanf(page, "%u", &new_value) != 1) {
1041 ret = -EINVAL;
1042 goto out;
1043 }
1044
1045 if (new_value != avc_cache_threshold) {
1046 ret = task_has_security(current, SECURITY__SETSECPARAM);
1047 if (ret)
1048 goto out_free;
1049 avc_cache_threshold = new_value;
1050 }
1051 ret = count;
1052 out_free:
1053 free_page((unsigned long)page);
1054 out:
1055 return ret;
1056 }
1057
1058 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1059 size_t count, loff_t *ppos)
1060 {
1061 char *page;
1062 ssize_t ret = 0;
1063
1064 page = (char *)__get_free_page(GFP_KERNEL);
1065 if (!page) {
1066 ret = -ENOMEM;
1067 goto out;
1068 }
1069 ret = avc_get_hash_stats(page);
1070 if (ret >= 0)
1071 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1072 free_page((unsigned long)page);
1073 out:
1074 return ret;
1075 }
1076
1077 static struct file_operations sel_avc_cache_threshold_ops = {
1078 .read = sel_read_avc_cache_threshold,
1079 .write = sel_write_avc_cache_threshold,
1080 };
1081
1082 static struct file_operations sel_avc_hash_stats_ops = {
1083 .read = sel_read_avc_hash_stats,
1084 };
1085
1086 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1087 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1088 {
1089 int cpu;
1090
1091 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1092 if (!cpu_possible(cpu))
1093 continue;
1094 *idx = cpu + 1;
1095 return &per_cpu(avc_cache_stats, cpu);
1096 }
1097 return NULL;
1098 }
1099
1100 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1101 {
1102 loff_t n = *pos - 1;
1103
1104 if (*pos == 0)
1105 return SEQ_START_TOKEN;
1106
1107 return sel_avc_get_stat_idx(&n);
1108 }
1109
1110 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1111 {
1112 return sel_avc_get_stat_idx(pos);
1113 }
1114
1115 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1116 {
1117 struct avc_cache_stats *st = v;
1118
1119 if (v == SEQ_START_TOKEN)
1120 seq_printf(seq, "lookups hits misses allocations reclaims "
1121 "frees\n");
1122 else
1123 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1124 st->hits, st->misses, st->allocations,
1125 st->reclaims, st->frees);
1126 return 0;
1127 }
1128
1129 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1130 { }
1131
1132 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1133 .start = sel_avc_stats_seq_start,
1134 .next = sel_avc_stats_seq_next,
1135 .show = sel_avc_stats_seq_show,
1136 .stop = sel_avc_stats_seq_stop,
1137 };
1138
1139 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1140 {
1141 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1142 }
1143
1144 static struct file_operations sel_avc_cache_stats_ops = {
1145 .open = sel_open_avc_cache_stats,
1146 .read = seq_read,
1147 .llseek = seq_lseek,
1148 .release = seq_release,
1149 };
1150 #endif
1151
1152 static int sel_make_avc_files(struct dentry *dir)
1153 {
1154 int i, ret = 0;
1155 static struct tree_descr files[] = {
1156 { "cache_threshold",
1157 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1158 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1159 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1160 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1161 #endif
1162 };
1163
1164 for (i = 0; i < ARRAY_SIZE(files); i++) {
1165 struct inode *inode;
1166 struct dentry *dentry;
1167
1168 dentry = d_alloc_name(dir, files[i].name);
1169 if (!dentry) {
1170 ret = -ENOMEM;
1171 goto err;
1172 }
1173
1174 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1175 if (!inode) {
1176 ret = -ENOMEM;
1177 goto err;
1178 }
1179 inode->i_fop = files[i].ops;
1180 d_add(dentry, inode);
1181 }
1182 out:
1183 return ret;
1184 err:
1185 d_genocide(dir);
1186 goto out;
1187 }
1188
1189 static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
1190 {
1191 int ret = 0;
1192 struct inode *inode;
1193
1194 inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
1195 if (!inode) {
1196 ret = -ENOMEM;
1197 goto out;
1198 }
1199 inode->i_op = &simple_dir_inode_operations;
1200 inode->i_fop = &simple_dir_operations;
1201 d_add(dentry, inode);
1202 out:
1203 return ret;
1204 }
1205
1206 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1207 {
1208 int ret;
1209 struct dentry *dentry;
1210 struct inode *inode;
1211 struct inode_security_struct *isec;
1212
1213 static struct tree_descr selinux_files[] = {
1214 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1215 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1216 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1217 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1218 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1219 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1220 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1221 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1222 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1223 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1224 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1225 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1226 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1227 /* last one */ {""}
1228 };
1229 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1230 if (ret)
1231 return ret;
1232
1233 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1234 if (!dentry)
1235 return -ENOMEM;
1236
1237 inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
1238 if (!inode)
1239 goto out;
1240 inode->i_op = &simple_dir_inode_operations;
1241 inode->i_fop = &simple_dir_operations;
1242 d_add(dentry, inode);
1243 bool_dir = dentry;
1244 ret = sel_make_bools();
1245 if (ret)
1246 goto out;
1247
1248 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1249 if (!dentry)
1250 return -ENOMEM;
1251
1252 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1253 if (!inode)
1254 goto out;
1255 isec = (struct inode_security_struct*)inode->i_security;
1256 isec->sid = SECINITSID_DEVNULL;
1257 isec->sclass = SECCLASS_CHR_FILE;
1258 isec->initialized = 1;
1259
1260 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1261 d_add(dentry, inode);
1262 selinux_null = dentry;
1263
1264 dentry = d_alloc_name(sb->s_root, "avc");
1265 if (!dentry)
1266 return -ENOMEM;
1267
1268 ret = sel_make_dir(sb, dentry);
1269 if (ret)
1270 goto out;
1271
1272 ret = sel_make_avc_files(dentry);
1273 if (ret)
1274 goto out;
1275
1276 return 0;
1277 out:
1278 dput(dentry);
1279 printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
1280 return -ENOMEM;
1281 }
1282
1283 static struct super_block *sel_get_sb(struct file_system_type *fs_type,
1284 int flags, const char *dev_name, void *data)
1285 {
1286 return get_sb_single(fs_type, flags, data, sel_fill_super);
1287 }
1288
1289 static struct file_system_type sel_fs_type = {
1290 .name = "selinuxfs",
1291 .get_sb = sel_get_sb,
1292 .kill_sb = kill_litter_super,
1293 };
1294
1295 struct vfsmount *selinuxfs_mount;
1296
1297 static int __init init_sel_fs(void)
1298 {
1299 int err;
1300
1301 if (!selinux_enabled)
1302 return 0;
1303 err = register_filesystem(&sel_fs_type);
1304 if (!err) {
1305 selinuxfs_mount = kern_mount(&sel_fs_type);
1306 if (IS_ERR(selinuxfs_mount)) {
1307 printk(KERN_ERR "selinuxfs: could not mount!\n");
1308 err = PTR_ERR(selinuxfs_mount);
1309 selinuxfs_mount = NULL;
1310 }
1311 }
1312 return err;
1313 }
1314
1315 __initcall(init_sel_fs);
1316
1317 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1318 void exit_sel_fs(void)
1319 {
1320 unregister_filesystem(&sel_fs_type);
1321 }
1322 #endif
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