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