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[PATCH] smc ethernet: fix section mismatch warnings
[linux-2.6/mini2440.git] / security / selinux / selinuxfs.c
bloba4efc966f065eae8599ee034a3ac760efca0d92f
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/mutex.h>
19 #include <linux/init.h>
20 #include <linux/string.h>
21 #include <linux/security.h>
22 #include <linux/major.h>
23 #include <linux/seq_file.h>
24 #include <linux/percpu.h>
25 #include <linux/audit.h>
26 #include <asm/uaccess.h>
27 #include <asm/semaphore.h>
28
29 /* selinuxfs pseudo filesystem for exporting the security policy API.
30 Based on the proc code and the fs/nfsd/nfsctl.c code. */
31
32 #include "flask.h"
33 #include "avc.h"
34 #include "avc_ss.h"
35 #include "security.h"
36 #include "objsec.h"
37 #include "conditional.h"
38
39 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
40
41 static int __init checkreqprot_setup(char *str)
42 {
43 selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
44 return 1;
45 }
46 __setup("checkreqprot=", checkreqprot_setup);
47
48
49 static DEFINE_MUTEX(sel_mutex);
50
51 /* global data for booleans */
52 static struct dentry *bool_dir = NULL;
53 static int bool_num = 0;
54 static int *bool_pending_values = NULL;
55
56 extern void selnl_notify_setenforce(int val);
57
58 /* Check whether a task is allowed to use a security operation. */
59 static int task_has_security(struct task_struct *tsk,
60 u32 perms)
61 {
62 struct task_security_struct *tsec;
63
64 tsec = tsk->security;
65 if (!tsec)
66 return -EACCES;
67
68 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
69 SECCLASS_SECURITY, perms, NULL);
70 }
71
72 enum sel_inos {
73 SEL_ROOT_INO = 2,
74 SEL_LOAD, /* load policy */
75 SEL_ENFORCE, /* get or set enforcing status */
76 SEL_CONTEXT, /* validate context */
77 SEL_ACCESS, /* compute access decision */
78 SEL_CREATE, /* compute create labeling decision */
79 SEL_RELABEL, /* compute relabeling decision */
80 SEL_USER, /* compute reachable user contexts */
81 SEL_POLICYVERS, /* return policy version for this kernel */
82 SEL_COMMIT_BOOLS, /* commit new boolean values */
83 SEL_MLS, /* return if MLS policy is enabled */
84 SEL_DISABLE, /* disable SELinux until next reboot */
85 SEL_AVC, /* AVC management directory */
86 SEL_MEMBER, /* compute polyinstantiation membership decision */
87 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
88 };
89
90 #define TMPBUFLEN 12
91 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
92 size_t count, loff_t *ppos)
93 {
94 char tmpbuf[TMPBUFLEN];
95 ssize_t length;
96
97 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
98 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
99 }
100
101 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
102 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
103 size_t count, loff_t *ppos)
104
105 {
106 char *page;
107 ssize_t length;
108 int new_value;
109
110 if (count >= PAGE_SIZE)
111 return -ENOMEM;
112 if (*ppos != 0) {
113 /* No partial writes. */
114 return -EINVAL;
115 }
116 page = (char*)get_zeroed_page(GFP_KERNEL);
117 if (!page)
118 return -ENOMEM;
119 length = -EFAULT;
120 if (copy_from_user(page, buf, count))
121 goto out;
122
123 length = -EINVAL;
124 if (sscanf(page, "%d", &new_value) != 1)
125 goto out;
126
127 if (new_value != selinux_enforcing) {
128 length = task_has_security(current, SECURITY__SETENFORCE);
129 if (length)
130 goto out;
131 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
132 "enforcing=%d old_enforcing=%d auid=%u", new_value,
133 selinux_enforcing,
134 audit_get_loginuid(current->audit_context));
135 selinux_enforcing = new_value;
136 if (selinux_enforcing)
137 avc_ss_reset(0);
138 selnl_notify_setenforce(selinux_enforcing);
139 }
140 length = count;
141 out:
142 free_page((unsigned long) page);
143 return length;
144 }
145 #else
146 #define sel_write_enforce NULL
147 #endif
148
149 static struct file_operations sel_enforce_ops = {
150 .read = sel_read_enforce,
151 .write = sel_write_enforce,
152 };
153
154 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
155 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
156 size_t count, loff_t *ppos)
157
158 {
159 char *page;
160 ssize_t length;
161 int new_value;
162 extern int selinux_disable(void);
163
164 if (count >= PAGE_SIZE)
165 return -ENOMEM;
166 if (*ppos != 0) {
167 /* No partial writes. */
168 return -EINVAL;
169 }
170 page = (char*)get_zeroed_page(GFP_KERNEL);
171 if (!page)
172 return -ENOMEM;
173 length = -EFAULT;
174 if (copy_from_user(page, buf, count))
175 goto out;
176
177 length = -EINVAL;
178 if (sscanf(page, "%d", &new_value) != 1)
179 goto out;
180
181 if (new_value) {
182 length = selinux_disable();
183 if (length < 0)
184 goto out;
185 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
186 "selinux=0 auid=%u",
187 audit_get_loginuid(current->audit_context));
188 }
189
190 length = count;
191 out:
192 free_page((unsigned long) page);
193 return length;
194 }
195 #else
196 #define sel_write_disable NULL
197 #endif
198
199 static struct file_operations sel_disable_ops = {
200 .write = sel_write_disable,
201 };
202
203 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
204 size_t count, loff_t *ppos)
205 {
206 char tmpbuf[TMPBUFLEN];
207 ssize_t length;
208
209 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
210 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
211 }
212
213 static struct file_operations sel_policyvers_ops = {
214 .read = sel_read_policyvers,
215 };
216
217 /* declaration for sel_write_load */
218 static int sel_make_bools(void);
219
220 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
221 size_t count, loff_t *ppos)
222 {
223 char tmpbuf[TMPBUFLEN];
224 ssize_t length;
225
226 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
227 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
228 }
229
230 static struct file_operations sel_mls_ops = {
231 .read = sel_read_mls,
232 };
233
234 static ssize_t sel_write_load(struct file * file, const char __user * buf,
235 size_t count, loff_t *ppos)
236
237 {
238 int ret;
239 ssize_t length;
240 void *data = NULL;
241
242 mutex_lock(&sel_mutex);
243
244 length = task_has_security(current, SECURITY__LOAD_POLICY);
245 if (length)
246 goto out;
247
248 if (*ppos != 0) {
249 /* No partial writes. */
250 length = -EINVAL;
251 goto out;
252 }
253
254 if ((count > 64 * 1024 * 1024)
255 || (data = vmalloc(count)) == NULL) {
256 length = -ENOMEM;
257 goto out;
258 }
259
260 length = -EFAULT;
261 if (copy_from_user(data, buf, count) != 0)
262 goto out;
263
264 length = security_load_policy(data, count);
265 if (length)
266 goto out;
267
268 ret = sel_make_bools();
269 if (ret)
270 length = ret;
271 else
272 length = count;
273 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
274 "policy loaded auid=%u",
275 audit_get_loginuid(current->audit_context));
276 out:
277 mutex_unlock(&sel_mutex);
278 vfree(data);
279 return length;
280 }
281
282 static struct file_operations sel_load_ops = {
283 .write = sel_write_load,
284 };
285
286 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
287 {
288 char *canon;
289 u32 sid, len;
290 ssize_t length;
291
292 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
293 if (length)
294 return length;
295
296 length = security_context_to_sid(buf, size, &sid);
297 if (length < 0)
298 return length;
299
300 length = security_sid_to_context(sid, &canon, &len);
301 if (length < 0)
302 return length;
303
304 if (len > SIMPLE_TRANSACTION_LIMIT) {
305 printk(KERN_ERR "%s: context size (%u) exceeds payload "
306 "max\n", __FUNCTION__, len);
307 length = -ERANGE;
308 goto out;
309 }
310
311 memcpy(buf, canon, len);
312 length = len;
313 out:
314 kfree(canon);
315 return length;
316 }
317
318 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
319 size_t count, loff_t *ppos)
320 {
321 char tmpbuf[TMPBUFLEN];
322 ssize_t length;
323
324 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
325 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
326 }
327
328 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
329 size_t count, loff_t *ppos)
330 {
331 char *page;
332 ssize_t length;
333 unsigned int new_value;
334
335 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
336 if (length)
337 return length;
338
339 if (count >= PAGE_SIZE)
340 return -ENOMEM;
341 if (*ppos != 0) {
342 /* No partial writes. */
343 return -EINVAL;
344 }
345 page = (char*)get_zeroed_page(GFP_KERNEL);
346 if (!page)
347 return -ENOMEM;
348 length = -EFAULT;
349 if (copy_from_user(page, buf, count))
350 goto out;
351
352 length = -EINVAL;
353 if (sscanf(page, "%u", &new_value) != 1)
354 goto out;
355
356 selinux_checkreqprot = new_value ? 1 : 0;
357 length = count;
358 out:
359 free_page((unsigned long) page);
360 return length;
361 }
362 static struct file_operations sel_checkreqprot_ops = {
363 .read = sel_read_checkreqprot,
364 .write = sel_write_checkreqprot,
365 };
366
367 /*
368 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
369 */
370 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
371 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
372 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
373 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
374 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
375
376 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
377 [SEL_ACCESS] = sel_write_access,
378 [SEL_CREATE] = sel_write_create,
379 [SEL_RELABEL] = sel_write_relabel,
380 [SEL_USER] = sel_write_user,
381 [SEL_MEMBER] = sel_write_member,
382 [SEL_CONTEXT] = sel_write_context,
383 };
384
385 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
386 {
387 ino_t ino = file->f_dentry->d_inode->i_ino;
388 char *data;
389 ssize_t rv;
390
391 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
392 return -EINVAL;
393
394 data = simple_transaction_get(file, buf, size);
395 if (IS_ERR(data))
396 return PTR_ERR(data);
397
398 rv = write_op[ino](file, data, size);
399 if (rv>0) {
400 simple_transaction_set(file, rv);
401 rv = size;
402 }
403 return rv;
404 }
405
406 static struct file_operations transaction_ops = {
407 .write = selinux_transaction_write,
408 .read = simple_transaction_read,
409 .release = simple_transaction_release,
410 };
411
412 /*
413 * payload - write methods
414 * If the method has a response, the response should be put in buf,
415 * and the length returned. Otherwise return 0 or and -error.
416 */
417
418 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
419 {
420 char *scon, *tcon;
421 u32 ssid, tsid;
422 u16 tclass;
423 u32 req;
424 struct av_decision avd;
425 ssize_t length;
426
427 length = task_has_security(current, SECURITY__COMPUTE_AV);
428 if (length)
429 return length;
430
431 length = -ENOMEM;
432 scon = kzalloc(size+1, GFP_KERNEL);
433 if (!scon)
434 return length;
435
436 tcon = kzalloc(size+1, GFP_KERNEL);
437 if (!tcon)
438 goto out;
439
440 length = -EINVAL;
441 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
442 goto out2;
443
444 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
445 if (length < 0)
446 goto out2;
447 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
448 if (length < 0)
449 goto out2;
450
451 length = security_compute_av(ssid, tsid, tclass, req, &avd);
452 if (length < 0)
453 goto out2;
454
455 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
456 "%x %x %x %x %u",
457 avd.allowed, avd.decided,
458 avd.auditallow, avd.auditdeny,
459 avd.seqno);
460 out2:
461 kfree(tcon);
462 out:
463 kfree(scon);
464 return length;
465 }
466
467 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
468 {
469 char *scon, *tcon;
470 u32 ssid, tsid, newsid;
471 u16 tclass;
472 ssize_t length;
473 char *newcon;
474 u32 len;
475
476 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
477 if (length)
478 return length;
479
480 length = -ENOMEM;
481 scon = kzalloc(size+1, GFP_KERNEL);
482 if (!scon)
483 return length;
484
485 tcon = kzalloc(size+1, GFP_KERNEL);
486 if (!tcon)
487 goto out;
488
489 length = -EINVAL;
490 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
491 goto out2;
492
493 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
494 if (length < 0)
495 goto out2;
496 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
497 if (length < 0)
498 goto out2;
499
500 length = security_transition_sid(ssid, tsid, tclass, &newsid);
501 if (length < 0)
502 goto out2;
503
504 length = security_sid_to_context(newsid, &newcon, &len);
505 if (length < 0)
506 goto out2;
507
508 if (len > SIMPLE_TRANSACTION_LIMIT) {
509 printk(KERN_ERR "%s: context size (%u) exceeds payload "
510 "max\n", __FUNCTION__, len);
511 length = -ERANGE;
512 goto out3;
513 }
514
515 memcpy(buf, newcon, len);
516 length = len;
517 out3:
518 kfree(newcon);
519 out2:
520 kfree(tcon);
521 out:
522 kfree(scon);
523 return length;
524 }
525
526 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
527 {
528 char *scon, *tcon;
529 u32 ssid, tsid, newsid;
530 u16 tclass;
531 ssize_t length;
532 char *newcon;
533 u32 len;
534
535 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
536 if (length)
537 return length;
538
539 length = -ENOMEM;
540 scon = kzalloc(size+1, GFP_KERNEL);
541 if (!scon)
542 return length;
543
544 tcon = kzalloc(size+1, GFP_KERNEL);
545 if (!tcon)
546 goto out;
547
548 length = -EINVAL;
549 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
550 goto out2;
551
552 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
553 if (length < 0)
554 goto out2;
555 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
556 if (length < 0)
557 goto out2;
558
559 length = security_change_sid(ssid, tsid, tclass, &newsid);
560 if (length < 0)
561 goto out2;
562
563 length = security_sid_to_context(newsid, &newcon, &len);
564 if (length < 0)
565 goto out2;
566
567 if (len > SIMPLE_TRANSACTION_LIMIT) {
568 length = -ERANGE;
569 goto out3;
570 }
571
572 memcpy(buf, newcon, len);
573 length = len;
574 out3:
575 kfree(newcon);
576 out2:
577 kfree(tcon);
578 out:
579 kfree(scon);
580 return length;
581 }
582
583 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
584 {
585 char *con, *user, *ptr;
586 u32 sid, *sids;
587 ssize_t length;
588 char *newcon;
589 int i, rc;
590 u32 len, nsids;
591
592 length = task_has_security(current, SECURITY__COMPUTE_USER);
593 if (length)
594 return length;
595
596 length = -ENOMEM;
597 con = kzalloc(size+1, GFP_KERNEL);
598 if (!con)
599 return length;
600
601 user = kzalloc(size+1, GFP_KERNEL);
602 if (!user)
603 goto out;
604
605 length = -EINVAL;
606 if (sscanf(buf, "%s %s", con, user) != 2)
607 goto out2;
608
609 length = security_context_to_sid(con, strlen(con)+1, &sid);
610 if (length < 0)
611 goto out2;
612
613 length = security_get_user_sids(sid, user, &sids, &nsids);
614 if (length < 0)
615 goto out2;
616
617 length = sprintf(buf, "%u", nsids) + 1;
618 ptr = buf + length;
619 for (i = 0; i < nsids; i++) {
620 rc = security_sid_to_context(sids[i], &newcon, &len);
621 if (rc) {
622 length = rc;
623 goto out3;
624 }
625 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
626 kfree(newcon);
627 length = -ERANGE;
628 goto out3;
629 }
630 memcpy(ptr, newcon, len);
631 kfree(newcon);
632 ptr += len;
633 length += len;
634 }
635 out3:
636 kfree(sids);
637 out2:
638 kfree(user);
639 out:
640 kfree(con);
641 return length;
642 }
643
644 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
645 {
646 char *scon, *tcon;
647 u32 ssid, tsid, newsid;
648 u16 tclass;
649 ssize_t length;
650 char *newcon;
651 u32 len;
652
653 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
654 if (length)
655 return length;
656
657 length = -ENOMEM;
658 scon = kzalloc(size+1, GFP_KERNEL);
659 if (!scon)
660 return length;
661
662 tcon = kzalloc(size+1, GFP_KERNEL);
663 if (!tcon)
664 goto out;
665
666 length = -EINVAL;
667 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
668 goto out2;
669
670 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
671 if (length < 0)
672 goto out2;
673 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
674 if (length < 0)
675 goto out2;
676
677 length = security_member_sid(ssid, tsid, tclass, &newsid);
678 if (length < 0)
679 goto out2;
680
681 length = security_sid_to_context(newsid, &newcon, &len);
682 if (length < 0)
683 goto out2;
684
685 if (len > SIMPLE_TRANSACTION_LIMIT) {
686 printk(KERN_ERR "%s: context size (%u) exceeds payload "
687 "max\n", __FUNCTION__, len);
688 length = -ERANGE;
689 goto out3;
690 }
691
692 memcpy(buf, newcon, len);
693 length = len;
694 out3:
695 kfree(newcon);
696 out2:
697 kfree(tcon);
698 out:
699 kfree(scon);
700 return length;
701 }
702
703 static struct inode *sel_make_inode(struct super_block *sb, int mode)
704 {
705 struct inode *ret = new_inode(sb);
706
707 if (ret) {
708 ret->i_mode = mode;
709 ret->i_uid = ret->i_gid = 0;
710 ret->i_blksize = PAGE_CACHE_SIZE;
711 ret->i_blocks = 0;
712 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
713 }
714 return ret;
715 }
716
717 #define BOOL_INO_OFFSET 30
718
719 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
720 size_t count, loff_t *ppos)
721 {
722 char *page = NULL;
723 ssize_t length;
724 ssize_t ret;
725 int cur_enforcing;
726 struct inode *inode;
727
728 mutex_lock(&sel_mutex);
729
730 ret = -EFAULT;
731
732 /* check to see if this file has been deleted */
733 if (!filep->f_op)
734 goto out;
735
736 if (count > PAGE_SIZE) {
737 ret = -EINVAL;
738 goto out;
739 }
740 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
741 ret = -ENOMEM;
742 goto out;
743 }
744
745 inode = filep->f_dentry->d_inode;
746 cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
747 if (cur_enforcing < 0) {
748 ret = cur_enforcing;
749 goto out;
750 }
751
752 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
753 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
754 ret = simple_read_from_buffer(buf, count, ppos, page, length);
755 out:
756 mutex_unlock(&sel_mutex);
757 if (page)
758 free_page((unsigned long)page);
759 return ret;
760 }
761
762 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
763 size_t count, loff_t *ppos)
764 {
765 char *page = NULL;
766 ssize_t length = -EFAULT;
767 int new_value;
768 struct inode *inode;
769
770 mutex_lock(&sel_mutex);
771
772 length = task_has_security(current, SECURITY__SETBOOL);
773 if (length)
774 goto out;
775
776 /* check to see if this file has been deleted */
777 if (!filep->f_op)
778 goto out;
779
780 if (count >= PAGE_SIZE) {
781 length = -ENOMEM;
782 goto out;
783 }
784 if (*ppos != 0) {
785 /* No partial writes. */
786 goto out;
787 }
788 page = (char*)get_zeroed_page(GFP_KERNEL);
789 if (!page) {
790 length = -ENOMEM;
791 goto out;
792 }
793
794 if (copy_from_user(page, buf, count))
795 goto out;
796
797 length = -EINVAL;
798 if (sscanf(page, "%d", &new_value) != 1)
799 goto out;
800
801 if (new_value)
802 new_value = 1;
803
804 inode = filep->f_dentry->d_inode;
805 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
806 length = count;
807
808 out:
809 mutex_unlock(&sel_mutex);
810 if (page)
811 free_page((unsigned long) page);
812 return length;
813 }
814
815 static struct file_operations sel_bool_ops = {
816 .read = sel_read_bool,
817 .write = sel_write_bool,
818 };
819
820 static ssize_t sel_commit_bools_write(struct file *filep,
821 const char __user *buf,
822 size_t count, loff_t *ppos)
823 {
824 char *page = NULL;
825 ssize_t length = -EFAULT;
826 int new_value;
827
828 mutex_lock(&sel_mutex);
829
830 length = task_has_security(current, SECURITY__SETBOOL);
831 if (length)
832 goto out;
833
834 /* check to see if this file has been deleted */
835 if (!filep->f_op)
836 goto out;
837
838 if (count >= PAGE_SIZE) {
839 length = -ENOMEM;
840 goto out;
841 }
842 if (*ppos != 0) {
843 /* No partial writes. */
844 goto out;
845 }
846 page = (char*)get_zeroed_page(GFP_KERNEL);
847 if (!page) {
848 length = -ENOMEM;
849 goto out;
850 }
851
852 if (copy_from_user(page, buf, count))
853 goto out;
854
855 length = -EINVAL;
856 if (sscanf(page, "%d", &new_value) != 1)
857 goto out;
858
859 if (new_value && bool_pending_values) {
860 security_set_bools(bool_num, bool_pending_values);
861 }
862
863 length = count;
864
865 out:
866 mutex_unlock(&sel_mutex);
867 if (page)
868 free_page((unsigned long) page);
869 return length;
870 }
871
872 static struct file_operations sel_commit_bools_ops = {
873 .write = sel_commit_bools_write,
874 };
875
876 /* delete booleans - partial revoke() from
877 * fs/proc/generic.c proc_kill_inodes */
878 static void sel_remove_bools(struct dentry *de)
879 {
880 struct list_head *p, *node;
881 struct super_block *sb = de->d_sb;
882
883 spin_lock(&dcache_lock);
884 node = de->d_subdirs.next;
885 while (node != &de->d_subdirs) {
886 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
887 list_del_init(node);
888
889 if (d->d_inode) {
890 d = dget_locked(d);
891 spin_unlock(&dcache_lock);
892 d_delete(d);
893 simple_unlink(de->d_inode, d);
894 dput(d);
895 spin_lock(&dcache_lock);
896 }
897 node = de->d_subdirs.next;
898 }
899
900 spin_unlock(&dcache_lock);
901
902 file_list_lock();
903 list_for_each(p, &sb->s_files) {
904 struct file * filp = list_entry(p, struct file, f_u.fu_list);
905 struct dentry * dentry = filp->f_dentry;
906
907 if (dentry->d_parent != de) {
908 continue;
909 }
910 filp->f_op = NULL;
911 }
912 file_list_unlock();
913 }
914
915 #define BOOL_DIR_NAME "booleans"
916
917 static int sel_make_bools(void)
918 {
919 int i, ret = 0;
920 ssize_t len;
921 struct dentry *dentry = NULL;
922 struct dentry *dir = bool_dir;
923 struct inode *inode = NULL;
924 struct inode_security_struct *isec;
925 char **names = NULL, *page;
926 int num;
927 int *values = NULL;
928 u32 sid;
929
930 /* remove any existing files */
931 kfree(bool_pending_values);
932 bool_pending_values = NULL;
933
934 sel_remove_bools(dir);
935
936 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
937 return -ENOMEM;
938
939 ret = security_get_bools(&num, &names, &values);
940 if (ret != 0)
941 goto out;
942
943 for (i = 0; i < num; i++) {
944 dentry = d_alloc_name(dir, names[i]);
945 if (!dentry) {
946 ret = -ENOMEM;
947 goto err;
948 }
949 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
950 if (!inode) {
951 ret = -ENOMEM;
952 goto err;
953 }
954
955 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
956 if (len < 0) {
957 ret = -EINVAL;
958 goto err;
959 } else if (len >= PAGE_SIZE) {
960 ret = -ENAMETOOLONG;
961 goto err;
962 }
963 isec = (struct inode_security_struct*)inode->i_security;
964 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
965 goto err;
966 isec->sid = sid;
967 isec->initialized = 1;
968 inode->i_fop = &sel_bool_ops;
969 inode->i_ino = i + BOOL_INO_OFFSET;
970 d_add(dentry, inode);
971 }
972 bool_num = num;
973 bool_pending_values = values;
974 out:
975 free_page((unsigned long)page);
976 if (names) {
977 for (i = 0; i < num; i++)
978 kfree(names[i]);
979 kfree(names);
980 }
981 return ret;
982 err:
983 kfree(values);
984 sel_remove_bools(dir);
985 ret = -ENOMEM;
986 goto out;
987 }
988
989 #define NULL_FILE_NAME "null"
990
991 struct dentry *selinux_null = NULL;
992
993 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
994 size_t count, loff_t *ppos)
995 {
996 char tmpbuf[TMPBUFLEN];
997 ssize_t length;
998
999 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1000 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1001 }
1002
1003 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1004 const char __user * buf,
1005 size_t count, loff_t *ppos)
1006
1007 {
1008 char *page;
1009 ssize_t ret;
1010 int new_value;
1011
1012 if (count >= PAGE_SIZE) {
1013 ret = -ENOMEM;
1014 goto out;
1015 }
1016
1017 if (*ppos != 0) {
1018 /* No partial writes. */
1019 ret = -EINVAL;
1020 goto out;
1021 }
1022
1023 page = (char*)get_zeroed_page(GFP_KERNEL);
1024 if (!page) {
1025 ret = -ENOMEM;
1026 goto out;
1027 }
1028
1029 if (copy_from_user(page, buf, count)) {
1030 ret = -EFAULT;
1031 goto out_free;
1032 }
1033
1034 if (sscanf(page, "%u", &new_value) != 1) {
1035 ret = -EINVAL;
1036 goto out;
1037 }
1038
1039 if (new_value != avc_cache_threshold) {
1040 ret = task_has_security(current, SECURITY__SETSECPARAM);
1041 if (ret)
1042 goto out_free;
1043 avc_cache_threshold = new_value;
1044 }
1045 ret = count;
1046 out_free:
1047 free_page((unsigned long)page);
1048 out:
1049 return ret;
1050 }
1051
1052 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1053 size_t count, loff_t *ppos)
1054 {
1055 char *page;
1056 ssize_t ret = 0;
1057
1058 page = (char *)__get_free_page(GFP_KERNEL);
1059 if (!page) {
1060 ret = -ENOMEM;
1061 goto out;
1062 }
1063 ret = avc_get_hash_stats(page);
1064 if (ret >= 0)
1065 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1066 free_page((unsigned long)page);
1067 out:
1068 return ret;
1069 }
1070
1071 static struct file_operations sel_avc_cache_threshold_ops = {
1072 .read = sel_read_avc_cache_threshold,
1073 .write = sel_write_avc_cache_threshold,
1074 };
1075
1076 static struct file_operations sel_avc_hash_stats_ops = {
1077 .read = sel_read_avc_hash_stats,
1078 };
1079
1080 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1081 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1082 {
1083 int cpu;
1084
1085 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1086 if (!cpu_possible(cpu))
1087 continue;
1088 *idx = cpu + 1;
1089 return &per_cpu(avc_cache_stats, cpu);
1090 }
1091 return NULL;
1092 }
1093
1094 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1095 {
1096 loff_t n = *pos - 1;
1097
1098 if (*pos == 0)
1099 return SEQ_START_TOKEN;
1100
1101 return sel_avc_get_stat_idx(&n);
1102 }
1103
1104 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1105 {
1106 return sel_avc_get_stat_idx(pos);
1107 }
1108
1109 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1110 {
1111 struct avc_cache_stats *st = v;
1112
1113 if (v == SEQ_START_TOKEN)
1114 seq_printf(seq, "lookups hits misses allocations reclaims "
1115 "frees\n");
1116 else
1117 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1118 st->hits, st->misses, st->allocations,
1119 st->reclaims, st->frees);
1120 return 0;
1121 }
1122
1123 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1124 { }
1125
1126 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1127 .start = sel_avc_stats_seq_start,
1128 .next = sel_avc_stats_seq_next,
1129 .show = sel_avc_stats_seq_show,
1130 .stop = sel_avc_stats_seq_stop,
1131 };
1132
1133 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1134 {
1135 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1136 }
1137
1138 static struct file_operations sel_avc_cache_stats_ops = {
1139 .open = sel_open_avc_cache_stats,
1140 .read = seq_read,
1141 .llseek = seq_lseek,
1142 .release = seq_release,
1143 };
1144 #endif
1145
1146 static int sel_make_avc_files(struct dentry *dir)
1147 {
1148 int i, ret = 0;
1149 static struct tree_descr files[] = {
1150 { "cache_threshold",
1151 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1152 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1153 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1154 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1155 #endif
1156 };
1157
1158 for (i = 0; i < ARRAY_SIZE(files); i++) {
1159 struct inode *inode;
1160 struct dentry *dentry;
1161
1162 dentry = d_alloc_name(dir, files[i].name);
1163 if (!dentry) {
1164 ret = -ENOMEM;
1165 goto out;
1166 }
1167
1168 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1169 if (!inode) {
1170 ret = -ENOMEM;
1171 goto out;
1172 }
1173 inode->i_fop = files[i].ops;
1174 d_add(dentry, inode);
1175 }
1176 out:
1177 return ret;
1178 }
1179
1180 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1181 {
1182 int ret = 0;
1183 struct inode *inode;
1184
1185 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1186 if (!inode) {
1187 ret = -ENOMEM;
1188 goto out;
1189 }
1190 inode->i_op = &simple_dir_inode_operations;
1191 inode->i_fop = &simple_dir_operations;
1192 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1193 inode->i_nlink++;
1194 d_add(dentry, inode);
1195 /* bump link count on parent directory, too */
1196 dir->i_nlink++;
1197 out:
1198 return ret;
1199 }
1200
1201 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1202 {
1203 int ret;
1204 struct dentry *dentry;
1205 struct inode *inode, *root_inode;
1206 struct inode_security_struct *isec;
1207
1208 static struct tree_descr selinux_files[] = {
1209 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1210 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1211 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1212 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1213 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1214 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1215 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1216 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1217 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1218 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1219 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1220 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1221 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1222 /* last one */ {""}
1223 };
1224 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1225 if (ret)
1226 goto err;
1227
1228 root_inode = sb->s_root->d_inode;
1229
1230 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1231 if (!dentry) {
1232 ret = -ENOMEM;
1233 goto err;
1234 }
1235
1236 ret = sel_make_dir(root_inode, dentry);
1237 if (ret)
1238 goto err;
1239
1240 bool_dir = dentry;
1241
1242 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1243 if (!dentry) {
1244 ret = -ENOMEM;
1245 goto err;
1246 }
1247
1248 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1249 if (!inode) {
1250 ret = -ENOMEM;
1251 goto err;
1252 }
1253 isec = (struct inode_security_struct*)inode->i_security;
1254 isec->sid = SECINITSID_DEVNULL;
1255 isec->sclass = SECCLASS_CHR_FILE;
1256 isec->initialized = 1;
1257
1258 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1259 d_add(dentry, inode);
1260 selinux_null = dentry;
1261
1262 dentry = d_alloc_name(sb->s_root, "avc");
1263 if (!dentry) {
1264 ret = -ENOMEM;
1265 goto err;
1266 }
1267
1268 ret = sel_make_dir(root_inode, dentry);
1269 if (ret)
1270 goto err;
1271
1272 ret = sel_make_avc_files(dentry);
1273 if (ret)
1274 goto err;
1275 out:
1276 return ret;
1277 err:
1278 printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
1279 goto out;
1280 }
1281
1282 static struct super_block *sel_get_sb(struct file_system_type *fs_type,
1283 int flags, const char *dev_name, void *data)
1284 {
1285 return get_sb_single(fs_type, flags, data, sel_fill_super);
1286 }
1287
1288 static struct file_system_type sel_fs_type = {
1289 .name = "selinuxfs",
1290 .get_sb = sel_get_sb,
1291 .kill_sb = kill_litter_super,
1292 };
1293
1294 struct vfsmount *selinuxfs_mount;
1295
1296 static int __init init_sel_fs(void)
1297 {
1298 int err;
1299
1300 if (!selinux_enabled)
1301 return 0;
1302 err = register_filesystem(&sel_fs_type);
1303 if (!err) {
1304 selinuxfs_mount = kern_mount(&sel_fs_type);
1305 if (IS_ERR(selinuxfs_mount)) {
1306 printk(KERN_ERR "selinuxfs: could not mount!\n");
1307 err = PTR_ERR(selinuxfs_mount);
1308 selinuxfs_mount = NULL;
1309 }
1310 }
1311 return err;
1312 }
1313
1314 __initcall(init_sel_fs);
1315
1316 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1317 void exit_sel_fs(void)
1318 {
1319 unregister_filesystem(&sel_fs_type);
1320 }
1321 #endif
Support for the Chinese Samsung S3C2440 based development boards