?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux-2.6.12-rc2
[linux-2.6/kvm.git] / security / selinux / selinuxfs.c
blob07221568b5059dac724b8a2c19cae9ccee6982d8
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 < 0 || 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 < 0 || 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 < 0) || (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
275 static ssize_t sel_write_context(struct file * file, const char __user * buf,
276 size_t count, loff_t *ppos)
277
278 {
279 char *page;
280 u32 sid;
281 ssize_t length;
282
283 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
284 if (length)
285 return length;
286
287 if (count < 0 || count >= PAGE_SIZE)
288 return -ENOMEM;
289 if (*ppos != 0) {
290 /* No partial writes. */
291 return -EINVAL;
292 }
293 page = (char*)get_zeroed_page(GFP_KERNEL);
294 if (!page)
295 return -ENOMEM;
296 length = -EFAULT;
297 if (copy_from_user(page, buf, count))
298 goto out;
299
300 length = security_context_to_sid(page, count, &sid);
301 if (length < 0)
302 goto out;
303
304 length = count;
305 out:
306 free_page((unsigned long) page);
307 return length;
308 }
309
310 static struct file_operations sel_context_ops = {
311 .write = sel_write_context,
312 };
313
314 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
315 size_t count, loff_t *ppos)
316 {
317 char tmpbuf[TMPBUFLEN];
318 ssize_t length;
319
320 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
321 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
322 }
323
324 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
325 size_t count, loff_t *ppos)
326 {
327 char *page;
328 ssize_t length;
329 unsigned int new_value;
330
331 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
332 if (length)
333 return length;
334
335 if (count < 0 || count >= PAGE_SIZE)
336 return -ENOMEM;
337 if (*ppos != 0) {
338 /* No partial writes. */
339 return -EINVAL;
340 }
341 page = (char*)get_zeroed_page(GFP_KERNEL);
342 if (!page)
343 return -ENOMEM;
344 length = -EFAULT;
345 if (copy_from_user(page, buf, count))
346 goto out;
347
348 length = -EINVAL;
349 if (sscanf(page, "%u", &new_value) != 1)
350 goto out;
351
352 selinux_checkreqprot = new_value ? 1 : 0;
353 length = count;
354 out:
355 free_page((unsigned long) page);
356 return length;
357 }
358 static struct file_operations sel_checkreqprot_ops = {
359 .read = sel_read_checkreqprot,
360 .write = sel_write_checkreqprot,
361 };
362
363 /*
364 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
365 */
366 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
367 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
368 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
369 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
370 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
371
372 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
373 [SEL_ACCESS] = sel_write_access,
374 [SEL_CREATE] = sel_write_create,
375 [SEL_RELABEL] = sel_write_relabel,
376 [SEL_USER] = sel_write_user,
377 [SEL_MEMBER] = sel_write_member,
378 };
379
380 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
381 {
382 ino_t ino = file->f_dentry->d_inode->i_ino;
383 char *data;
384 ssize_t rv;
385
386 if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
387 return -EINVAL;
388
389 data = simple_transaction_get(file, buf, size);
390 if (IS_ERR(data))
391 return PTR_ERR(data);
392
393 rv = write_op[ino](file, data, size);
394 if (rv>0) {
395 simple_transaction_set(file, rv);
396 rv = size;
397 }
398 return rv;
399 }
400
401 static struct file_operations transaction_ops = {
402 .write = selinux_transaction_write,
403 .read = simple_transaction_read,
404 .release = simple_transaction_release,
405 };
406
407 /*
408 * payload - write methods
409 * If the method has a response, the response should be put in buf,
410 * and the length returned. Otherwise return 0 or and -error.
411 */
412
413 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
414 {
415 char *scon, *tcon;
416 u32 ssid, tsid;
417 u16 tclass;
418 u32 req;
419 struct av_decision avd;
420 ssize_t length;
421
422 length = task_has_security(current, SECURITY__COMPUTE_AV);
423 if (length)
424 return length;
425
426 length = -ENOMEM;
427 scon = kmalloc(size+1, GFP_KERNEL);
428 if (!scon)
429 return length;
430 memset(scon, 0, size+1);
431
432 tcon = kmalloc(size+1, GFP_KERNEL);
433 if (!tcon)
434 goto out;
435 memset(tcon, 0, size+1);
436
437 length = -EINVAL;
438 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
439 goto out2;
440
441 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
442 if (length < 0)
443 goto out2;
444 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
445 if (length < 0)
446 goto out2;
447
448 length = security_compute_av(ssid, tsid, tclass, req, &avd);
449 if (length < 0)
450 goto out2;
451
452 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
453 "%x %x %x %x %u",
454 avd.allowed, avd.decided,
455 avd.auditallow, avd.auditdeny,
456 avd.seqno);
457 out2:
458 kfree(tcon);
459 out:
460 kfree(scon);
461 return length;
462 }
463
464 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
465 {
466 char *scon, *tcon;
467 u32 ssid, tsid, newsid;
468 u16 tclass;
469 ssize_t length;
470 char *newcon;
471 u32 len;
472
473 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
474 if (length)
475 return length;
476
477 length = -ENOMEM;
478 scon = kmalloc(size+1, GFP_KERNEL);
479 if (!scon)
480 return length;
481 memset(scon, 0, size+1);
482
483 tcon = kmalloc(size+1, GFP_KERNEL);
484 if (!tcon)
485 goto out;
486 memset(tcon, 0, size+1);
487
488 length = -EINVAL;
489 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
490 goto out2;
491
492 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
493 if (length < 0)
494 goto out2;
495 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
496 if (length < 0)
497 goto out2;
498
499 length = security_transition_sid(ssid, tsid, tclass, &newsid);
500 if (length < 0)
501 goto out2;
502
503 length = security_sid_to_context(newsid, &newcon, &len);
504 if (length < 0)
505 goto out2;
506
507 if (len > SIMPLE_TRANSACTION_LIMIT) {
508 printk(KERN_ERR "%s: context size (%u) exceeds payload "
509 "max\n", __FUNCTION__, len);
510 length = -ERANGE;
511 goto out3;
512 }
513
514 memcpy(buf, newcon, len);
515 length = len;
516 out3:
517 kfree(newcon);
518 out2:
519 kfree(tcon);
520 out:
521 kfree(scon);
522 return length;
523 }
524
525 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
526 {
527 char *scon, *tcon;
528 u32 ssid, tsid, newsid;
529 u16 tclass;
530 ssize_t length;
531 char *newcon;
532 u32 len;
533
534 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
535 if (length)
536 return length;
537
538 length = -ENOMEM;
539 scon = kmalloc(size+1, GFP_KERNEL);
540 if (!scon)
541 return length;
542 memset(scon, 0, size+1);
543
544 tcon = kmalloc(size+1, GFP_KERNEL);
545 if (!tcon)
546 goto out;
547 memset(tcon, 0, size+1);
548
549 length = -EINVAL;
550 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
551 goto out2;
552
553 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
554 if (length < 0)
555 goto out2;
556 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
557 if (length < 0)
558 goto out2;
559
560 length = security_change_sid(ssid, tsid, tclass, &newsid);
561 if (length < 0)
562 goto out2;
563
564 length = security_sid_to_context(newsid, &newcon, &len);
565 if (length < 0)
566 goto out2;
567
568 if (len > SIMPLE_TRANSACTION_LIMIT) {
569 length = -ERANGE;
570 goto out3;
571 }
572
573 memcpy(buf, newcon, len);
574 length = len;
575 out3:
576 kfree(newcon);
577 out2:
578 kfree(tcon);
579 out:
580 kfree(scon);
581 return length;
582 }
583
584 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
585 {
586 char *con, *user, *ptr;
587 u32 sid, *sids;
588 ssize_t length;
589 char *newcon;
590 int i, rc;
591 u32 len, nsids;
592
593 length = task_has_security(current, SECURITY__COMPUTE_USER);
594 if (length)
595 return length;
596
597 length = -ENOMEM;
598 con = kmalloc(size+1, GFP_KERNEL);
599 if (!con)
600 return length;
601 memset(con, 0, size+1);
602
603 user = kmalloc(size+1, GFP_KERNEL);
604 if (!user)
605 goto out;
606 memset(user, 0, size+1);
607
608 length = -EINVAL;
609 if (sscanf(buf, "%s %s", con, user) != 2)
610 goto out2;
611
612 length = security_context_to_sid(con, strlen(con)+1, &sid);
613 if (length < 0)
614 goto out2;
615
616 length = security_get_user_sids(sid, user, &sids, &nsids);
617 if (length < 0)
618 goto out2;
619
620 length = sprintf(buf, "%u", nsids) + 1;
621 ptr = buf + length;
622 for (i = 0; i < nsids; i++) {
623 rc = security_sid_to_context(sids[i], &newcon, &len);
624 if (rc) {
625 length = rc;
626 goto out3;
627 }
628 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
629 kfree(newcon);
630 length = -ERANGE;
631 goto out3;
632 }
633 memcpy(ptr, newcon, len);
634 kfree(newcon);
635 ptr += len;
636 length += len;
637 }
638 out3:
639 kfree(sids);
640 out2:
641 kfree(user);
642 out:
643 kfree(con);
644 return length;
645 }
646
647 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
648 {
649 char *scon, *tcon;
650 u32 ssid, tsid, newsid;
651 u16 tclass;
652 ssize_t length;
653 char *newcon;
654 u32 len;
655
656 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
657 if (length)
658 return length;
659
660 length = -ENOMEM;
661 scon = kmalloc(size+1, GFP_KERNEL);
662 if (!scon)
663 return length;
664 memset(scon, 0, size+1);
665
666 tcon = kmalloc(size+1, GFP_KERNEL);
667 if (!tcon)
668 goto out;
669 memset(tcon, 0, size+1);
670
671 length = -EINVAL;
672 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
673 goto out2;
674
675 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
676 if (length < 0)
677 goto out2;
678 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
679 if (length < 0)
680 goto out2;
681
682 length = security_member_sid(ssid, tsid, tclass, &newsid);
683 if (length < 0)
684 goto out2;
685
686 length = security_sid_to_context(newsid, &newcon, &len);
687 if (length < 0)
688 goto out2;
689
690 if (len > SIMPLE_TRANSACTION_LIMIT) {
691 printk(KERN_ERR "%s: context size (%u) exceeds payload "
692 "max\n", __FUNCTION__, len);
693 length = -ERANGE;
694 goto out3;
695 }
696
697 memcpy(buf, newcon, len);
698 length = len;
699 out3:
700 kfree(newcon);
701 out2:
702 kfree(tcon);
703 out:
704 kfree(scon);
705 return length;
706 }
707
708 static struct inode *sel_make_inode(struct super_block *sb, int mode)
709 {
710 struct inode *ret = new_inode(sb);
711
712 if (ret) {
713 ret->i_mode = mode;
714 ret->i_uid = ret->i_gid = 0;
715 ret->i_blksize = PAGE_CACHE_SIZE;
716 ret->i_blocks = 0;
717 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
718 }
719 return ret;
720 }
721
722 #define BOOL_INO_OFFSET 30
723
724 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
725 size_t count, loff_t *ppos)
726 {
727 char *page = NULL;
728 ssize_t length;
729 ssize_t end;
730 ssize_t ret;
731 int cur_enforcing;
732 struct inode *inode;
733
734 down(&sel_sem);
735
736 ret = -EFAULT;
737
738 /* check to see if this file has been deleted */
739 if (!filep->f_op)
740 goto out;
741
742 if (count < 0 || count > PAGE_SIZE) {
743 ret = -EINVAL;
744 goto out;
745 }
746 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
747 ret = -ENOMEM;
748 goto out;
749 }
750
751 inode = filep->f_dentry->d_inode;
752 cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
753 if (cur_enforcing < 0) {
754 ret = cur_enforcing;
755 goto out;
756 }
757
758 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
759 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
760 if (length < 0) {
761 ret = length;
762 goto out;
763 }
764
765 if (*ppos >= length) {
766 ret = 0;
767 goto out;
768 }
769 if (count + *ppos > length)
770 count = length - *ppos;
771 end = count + *ppos;
772 if (copy_to_user(buf, (char *) page + *ppos, count)) {
773 ret = -EFAULT;
774 goto out;
775 }
776 *ppos = end;
777 ret = count;
778 out:
779 up(&sel_sem);
780 if (page)
781 free_page((unsigned long)page);
782 return ret;
783 }
784
785 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
786 size_t count, loff_t *ppos)
787 {
788 char *page = NULL;
789 ssize_t length = -EFAULT;
790 int new_value;
791 struct inode *inode;
792
793 down(&sel_sem);
794
795 length = task_has_security(current, SECURITY__SETBOOL);
796 if (length)
797 goto out;
798
799 /* check to see if this file has been deleted */
800 if (!filep->f_op)
801 goto out;
802
803 if (count < 0 || count >= PAGE_SIZE) {
804 length = -ENOMEM;
805 goto out;
806 }
807 if (*ppos != 0) {
808 /* No partial writes. */
809 goto out;
810 }
811 page = (char*)get_zeroed_page(GFP_KERNEL);
812 if (!page) {
813 length = -ENOMEM;
814 goto out;
815 }
816
817 if (copy_from_user(page, buf, count))
818 goto out;
819
820 length = -EINVAL;
821 if (sscanf(page, "%d", &new_value) != 1)
822 goto out;
823
824 if (new_value)
825 new_value = 1;
826
827 inode = filep->f_dentry->d_inode;
828 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
829 length = count;
830
831 out:
832 up(&sel_sem);
833 if (page)
834 free_page((unsigned long) page);
835 return length;
836 }
837
838 static struct file_operations sel_bool_ops = {
839 .read = sel_read_bool,
840 .write = sel_write_bool,
841 };
842
843 static ssize_t sel_commit_bools_write(struct file *filep,
844 const char __user *buf,
845 size_t count, loff_t *ppos)
846 {
847 char *page = NULL;
848 ssize_t length = -EFAULT;
849 int new_value;
850
851 down(&sel_sem);
852
853 length = task_has_security(current, SECURITY__SETBOOL);
854 if (length)
855 goto out;
856
857 /* check to see if this file has been deleted */
858 if (!filep->f_op)
859 goto out;
860
861 if (count < 0 || count >= PAGE_SIZE) {
862 length = -ENOMEM;
863 goto out;
864 }
865 if (*ppos != 0) {
866 /* No partial writes. */
867 goto out;
868 }
869 page = (char*)get_zeroed_page(GFP_KERNEL);
870 if (!page) {
871 length = -ENOMEM;
872 goto out;
873 }
874
875 if (copy_from_user(page, buf, count))
876 goto out;
877
878 length = -EINVAL;
879 if (sscanf(page, "%d", &new_value) != 1)
880 goto out;
881
882 if (new_value) {
883 security_set_bools(bool_num, bool_pending_values);
884 }
885
886 length = count;
887
888 out:
889 up(&sel_sem);
890 if (page)
891 free_page((unsigned long) page);
892 return length;
893 }
894
895 static struct file_operations sel_commit_bools_ops = {
896 .write = sel_commit_bools_write,
897 };
898
899 /* delete booleans - partial revoke() from
900 * fs/proc/generic.c proc_kill_inodes */
901 static void sel_remove_bools(struct dentry *de)
902 {
903 struct list_head *p, *node;
904 struct super_block *sb = de->d_sb;
905
906 spin_lock(&dcache_lock);
907 node = de->d_subdirs.next;
908 while (node != &de->d_subdirs) {
909 struct dentry *d = list_entry(node, struct dentry, d_child);
910 list_del_init(node);
911
912 if (d->d_inode) {
913 d = dget_locked(d);
914 spin_unlock(&dcache_lock);
915 d_delete(d);
916 simple_unlink(de->d_inode, d);
917 dput(d);
918 spin_lock(&dcache_lock);
919 }
920 node = de->d_subdirs.next;
921 }
922
923 spin_unlock(&dcache_lock);
924
925 file_list_lock();
926 list_for_each(p, &sb->s_files) {
927 struct file * filp = list_entry(p, struct file, f_list);
928 struct dentry * dentry = filp->f_dentry;
929
930 if (dentry->d_parent != de) {
931 continue;
932 }
933 filp->f_op = NULL;
934 }
935 file_list_unlock();
936 }
937
938 #define BOOL_DIR_NAME "booleans"
939
940 static int sel_make_bools(void)
941 {
942 int i, ret = 0;
943 ssize_t len;
944 struct dentry *dentry = NULL;
945 struct dentry *dir = bool_dir;
946 struct inode *inode = NULL;
947 struct inode_security_struct *isec;
948 char **names = NULL, *page;
949 int num;
950 int *values = NULL;
951 u32 sid;
952
953 /* remove any existing files */
954 if (bool_pending_values)
955 kfree(bool_pending_values);
956
957 sel_remove_bools(dir);
958
959 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
960 return -ENOMEM;
961
962 ret = security_get_bools(&num, &names, &values);
963 if (ret != 0)
964 goto out;
965
966 for (i = 0; i < num; i++) {
967 dentry = d_alloc_name(dir, names[i]);
968 if (!dentry) {
969 ret = -ENOMEM;
970 goto err;
971 }
972 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
973 if (!inode) {
974 ret = -ENOMEM;
975 goto err;
976 }
977
978 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
979 if (len < 0) {
980 ret = -EINVAL;
981 goto err;
982 } else if (len >= PAGE_SIZE) {
983 ret = -ENAMETOOLONG;
984 goto err;
985 }
986 isec = (struct inode_security_struct*)inode->i_security;
987 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
988 goto err;
989 isec->sid = sid;
990 isec->initialized = 1;
991 inode->i_fop = &sel_bool_ops;
992 inode->i_ino = i + BOOL_INO_OFFSET;
993 d_add(dentry, inode);
994 }
995 bool_num = num;
996 bool_pending_values = values;
997 out:
998 free_page((unsigned long)page);
999 if (names) {
1000 for (i = 0; i < num; i++) {
1001 if (names[i])
1002 kfree(names[i]);
1003 }
1004 kfree(names);
1005 }
1006 return ret;
1007 err:
1008 d_genocide(dir);
1009 ret = -ENOMEM;
1010 goto out;
1011 }
1012
1013 #define NULL_FILE_NAME "null"
1014
1015 struct dentry *selinux_null = NULL;
1016
1017 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1018 size_t count, loff_t *ppos)
1019 {
1020 char tmpbuf[TMPBUFLEN];
1021 ssize_t length;
1022
1023 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1024 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1025 }
1026
1027 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1028 const char __user * buf,
1029 size_t count, loff_t *ppos)
1030
1031 {
1032 char *page;
1033 ssize_t ret;
1034 int new_value;
1035
1036 if (count < 0 || count >= PAGE_SIZE) {
1037 ret = -ENOMEM;
1038 goto out;
1039 }
1040
1041 if (*ppos != 0) {
1042 /* No partial writes. */
1043 ret = -EINVAL;
1044 goto out;
1045 }
1046
1047 page = (char*)get_zeroed_page(GFP_KERNEL);
1048 if (!page) {
1049 ret = -ENOMEM;
1050 goto out;
1051 }
1052
1053 if (copy_from_user(page, buf, count)) {
1054 ret = -EFAULT;
1055 goto out_free;
1056 }
1057
1058 if (sscanf(page, "%u", &new_value) != 1) {
1059 ret = -EINVAL;
1060 goto out;
1061 }
1062
1063 if (new_value != avc_cache_threshold) {
1064 ret = task_has_security(current, SECURITY__SETSECPARAM);
1065 if (ret)
1066 goto out_free;
1067 avc_cache_threshold = new_value;
1068 }
1069 ret = count;
1070 out_free:
1071 free_page((unsigned long)page);
1072 out:
1073 return ret;
1074 }
1075
1076 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1077 size_t count, loff_t *ppos)
1078 {
1079 char *page;
1080 ssize_t ret = 0;
1081
1082 page = (char *)__get_free_page(GFP_KERNEL);
1083 if (!page) {
1084 ret = -ENOMEM;
1085 goto out;
1086 }
1087 ret = avc_get_hash_stats(page);
1088 if (ret >= 0)
1089 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1090 free_page((unsigned long)page);
1091 out:
1092 return ret;
1093 }
1094
1095 static struct file_operations sel_avc_cache_threshold_ops = {
1096 .read = sel_read_avc_cache_threshold,
1097 .write = sel_write_avc_cache_threshold,
1098 };
1099
1100 static struct file_operations sel_avc_hash_stats_ops = {
1101 .read = sel_read_avc_hash_stats,
1102 };
1103
1104 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1105 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1106 {
1107 int cpu;
1108
1109 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1110 if (!cpu_possible(cpu))
1111 continue;
1112 *idx = cpu + 1;
1113 return &per_cpu(avc_cache_stats, cpu);
1114 }
1115 return NULL;
1116 }
1117
1118 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1119 {
1120 loff_t n = *pos - 1;
1121
1122 if (*pos == 0)
1123 return SEQ_START_TOKEN;
1124
1125 return sel_avc_get_stat_idx(&n);
1126 }
1127
1128 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1129 {
1130 return sel_avc_get_stat_idx(pos);
1131 }
1132
1133 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1134 {
1135 struct avc_cache_stats *st = v;
1136
1137 if (v == SEQ_START_TOKEN)
1138 seq_printf(seq, "lookups hits misses allocations reclaims "
1139 "frees\n");
1140 else
1141 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1142 st->hits, st->misses, st->allocations,
1143 st->reclaims, st->frees);
1144 return 0;
1145 }
1146
1147 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1148 { }
1149
1150 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1151 .start = sel_avc_stats_seq_start,
1152 .next = sel_avc_stats_seq_next,
1153 .show = sel_avc_stats_seq_show,
1154 .stop = sel_avc_stats_seq_stop,
1155 };
1156
1157 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1158 {
1159 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1160 }
1161
1162 static struct file_operations sel_avc_cache_stats_ops = {
1163 .open = sel_open_avc_cache_stats,
1164 .read = seq_read,
1165 .llseek = seq_lseek,
1166 .release = seq_release,
1167 };
1168 #endif
1169
1170 static int sel_make_avc_files(struct dentry *dir)
1171 {
1172 int i, ret = 0;
1173 static struct tree_descr files[] = {
1174 { "cache_threshold",
1175 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1176 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1177 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1178 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1179 #endif
1180 };
1181
1182 for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) {
1183 struct inode *inode;
1184 struct dentry *dentry;
1185
1186 dentry = d_alloc_name(dir, files[i].name);
1187 if (!dentry) {
1188 ret = -ENOMEM;
1189 goto err;
1190 }
1191
1192 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1193 if (!inode) {
1194 ret = -ENOMEM;
1195 goto err;
1196 }
1197 inode->i_fop = files[i].ops;
1198 d_add(dentry, inode);
1199 }
1200 out:
1201 return ret;
1202 err:
1203 d_genocide(dir);
1204 goto out;
1205 }
1206
1207 static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
1208 {
1209 int ret = 0;
1210 struct inode *inode;
1211
1212 inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
1213 if (!inode) {
1214 ret = -ENOMEM;
1215 goto out;
1216 }
1217 inode->i_op = &simple_dir_inode_operations;
1218 inode->i_fop = &simple_dir_operations;
1219 d_add(dentry, inode);
1220 out:
1221 return ret;
1222 }
1223
1224 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1225 {
1226 int ret;
1227 struct dentry *dentry;
1228 struct inode *inode;
1229 struct inode_security_struct *isec;
1230
1231 static struct tree_descr selinux_files[] = {
1232 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1233 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1234 [SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO},
1235 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1236 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1237 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1238 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1239 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1240 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1241 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1242 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1243 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1244 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1245 /* last one */ {""}
1246 };
1247 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1248 if (ret)
1249 return ret;
1250
1251 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1252 if (!dentry)
1253 return -ENOMEM;
1254
1255 inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
1256 if (!inode)
1257 goto out;
1258 inode->i_op = &simple_dir_inode_operations;
1259 inode->i_fop = &simple_dir_operations;
1260 d_add(dentry, inode);
1261 bool_dir = dentry;
1262 ret = sel_make_bools();
1263 if (ret)
1264 goto out;
1265
1266 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1267 if (!dentry)
1268 return -ENOMEM;
1269
1270 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1271 if (!inode)
1272 goto out;
1273 isec = (struct inode_security_struct*)inode->i_security;
1274 isec->sid = SECINITSID_DEVNULL;
1275 isec->sclass = SECCLASS_CHR_FILE;
1276 isec->initialized = 1;
1277
1278 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1279 d_add(dentry, inode);
1280 selinux_null = dentry;
1281
1282 dentry = d_alloc_name(sb->s_root, "avc");
1283 if (!dentry)
1284 return -ENOMEM;
1285
1286 ret = sel_make_dir(sb, dentry);
1287 if (ret)
1288 goto out;
1289
1290 ret = sel_make_avc_files(dentry);
1291 if (ret)
1292 goto out;
1293
1294 return 0;
1295 out:
1296 dput(dentry);
1297 printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
1298 return -ENOMEM;
1299 }
1300
1301 static struct super_block *sel_get_sb(struct file_system_type *fs_type,
1302 int flags, const char *dev_name, void *data)
1303 {
1304 return get_sb_single(fs_type, flags, data, sel_fill_super);
1305 }
1306
1307 static struct file_system_type sel_fs_type = {
1308 .name = "selinuxfs",
1309 .get_sb = sel_get_sb,
1310 .kill_sb = kill_litter_super,
1311 };
1312
1313 struct vfsmount *selinuxfs_mount;
1314
1315 static int __init init_sel_fs(void)
1316 {
1317 int err;
1318
1319 if (!selinux_enabled)
1320 return 0;
1321 err = register_filesystem(&sel_fs_type);
1322 if (!err) {
1323 selinuxfs_mount = kern_mount(&sel_fs_type);
1324 if (IS_ERR(selinuxfs_mount)) {
1325 printk(KERN_ERR "selinuxfs: could not mount!\n");
1326 err = PTR_ERR(selinuxfs_mount);
1327 selinuxfs_mount = NULL;
1328 }
1329 }
1330 return err;
1331 }
1332
1333 __initcall(init_sel_fs);
1334
1335 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1336 void exit_sel_fs(void)
1337 {
1338 unregister_filesystem(&sel_fs_type);
1339 }
1340 #endif
kernel-based virtual machine