?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
IPV4: Fix OOPS'er added to netlink fib.
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blob93b3177c7585aca735deea6397cbddee86a192cd
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/kernel.h>
13 #include <linux/pagemap.h>
14 #include <linux/slab.h>
15 #include <linux/vmalloc.h>
16 #include <linux/fs.h>
17 #include <linux/mutex.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 <linux/audit.h>
25 #include <asm/uaccess.h>
26 #include <asm/semaphore.h>
27
28 /* selinuxfs pseudo filesystem for exporting the security policy API.
29 Based on the proc code and the fs/nfsd/nfsctl.c code. */
30
31 #include "flask.h"
32 #include "avc.h"
33 #include "avc_ss.h"
34 #include "security.h"
35 #include "objsec.h"
36 #include "conditional.h"
37
38 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
39
40 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
41 #define SELINUX_COMPAT_NET_VALUE 0
42 #else
43 #define SELINUX_COMPAT_NET_VALUE 1
44 #endif
45
46 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
47
48 static int __init checkreqprot_setup(char *str)
49 {
50 selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
51 return 1;
52 }
53 __setup("checkreqprot=", checkreqprot_setup);
54
55 static int __init selinux_compat_net_setup(char *str)
56 {
57 selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
58 return 1;
59 }
60 __setup("selinux_compat_net=", selinux_compat_net_setup);
61
62
63 static DEFINE_MUTEX(sel_mutex);
64
65 /* global data for booleans */
66 static struct dentry *bool_dir = NULL;
67 static int bool_num = 0;
68 static int *bool_pending_values = NULL;
69
70 extern void selnl_notify_setenforce(int val);
71
72 /* Check whether a task is allowed to use a security operation. */
73 static int task_has_security(struct task_struct *tsk,
74 u32 perms)
75 {
76 struct task_security_struct *tsec;
77
78 tsec = tsk->security;
79 if (!tsec)
80 return -EACCES;
81
82 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
83 SECCLASS_SECURITY, perms, NULL);
84 }
85
86 enum sel_inos {
87 SEL_ROOT_INO = 2,
88 SEL_LOAD, /* load policy */
89 SEL_ENFORCE, /* get or set enforcing status */
90 SEL_CONTEXT, /* validate context */
91 SEL_ACCESS, /* compute access decision */
92 SEL_CREATE, /* compute create labeling decision */
93 SEL_RELABEL, /* compute relabeling decision */
94 SEL_USER, /* compute reachable user contexts */
95 SEL_POLICYVERS, /* return policy version for this kernel */
96 SEL_COMMIT_BOOLS, /* commit new boolean values */
97 SEL_MLS, /* return if MLS policy is enabled */
98 SEL_DISABLE, /* disable SELinux until next reboot */
99 SEL_AVC, /* AVC management directory */
100 SEL_MEMBER, /* compute polyinstantiation membership decision */
101 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
102 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
103 };
104
105 #define TMPBUFLEN 12
106 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
107 size_t count, loff_t *ppos)
108 {
109 char tmpbuf[TMPBUFLEN];
110 ssize_t length;
111
112 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
113 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
114 }
115
116 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
117 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
118 size_t count, loff_t *ppos)
119
120 {
121 char *page;
122 ssize_t length;
123 int new_value;
124
125 if (count >= PAGE_SIZE)
126 return -ENOMEM;
127 if (*ppos != 0) {
128 /* No partial writes. */
129 return -EINVAL;
130 }
131 page = (char*)get_zeroed_page(GFP_KERNEL);
132 if (!page)
133 return -ENOMEM;
134 length = -EFAULT;
135 if (copy_from_user(page, buf, count))
136 goto out;
137
138 length = -EINVAL;
139 if (sscanf(page, "%d", &new_value) != 1)
140 goto out;
141
142 if (new_value != selinux_enforcing) {
143 length = task_has_security(current, SECURITY__SETENFORCE);
144 if (length)
145 goto out;
146 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
147 "enforcing=%d old_enforcing=%d auid=%u", new_value,
148 selinux_enforcing,
149 audit_get_loginuid(current->audit_context));
150 selinux_enforcing = new_value;
151 if (selinux_enforcing)
152 avc_ss_reset(0);
153 selnl_notify_setenforce(selinux_enforcing);
154 }
155 length = count;
156 out:
157 free_page((unsigned long) page);
158 return length;
159 }
160 #else
161 #define sel_write_enforce NULL
162 #endif
163
164 static const struct file_operations sel_enforce_ops = {
165 .read = sel_read_enforce,
166 .write = sel_write_enforce,
167 };
168
169 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
170 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
171 size_t count, loff_t *ppos)
172
173 {
174 char *page;
175 ssize_t length;
176 int new_value;
177 extern int selinux_disable(void);
178
179 if (count >= PAGE_SIZE)
180 return -ENOMEM;
181 if (*ppos != 0) {
182 /* No partial writes. */
183 return -EINVAL;
184 }
185 page = (char*)get_zeroed_page(GFP_KERNEL);
186 if (!page)
187 return -ENOMEM;
188 length = -EFAULT;
189 if (copy_from_user(page, buf, count))
190 goto out;
191
192 length = -EINVAL;
193 if (sscanf(page, "%d", &new_value) != 1)
194 goto out;
195
196 if (new_value) {
197 length = selinux_disable();
198 if (length < 0)
199 goto out;
200 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
201 "selinux=0 auid=%u",
202 audit_get_loginuid(current->audit_context));
203 }
204
205 length = count;
206 out:
207 free_page((unsigned long) page);
208 return length;
209 }
210 #else
211 #define sel_write_disable NULL
212 #endif
213
214 static const struct file_operations sel_disable_ops = {
215 .write = sel_write_disable,
216 };
217
218 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
219 size_t count, loff_t *ppos)
220 {
221 char tmpbuf[TMPBUFLEN];
222 ssize_t length;
223
224 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
225 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
226 }
227
228 static const struct file_operations sel_policyvers_ops = {
229 .read = sel_read_policyvers,
230 };
231
232 /* declaration for sel_write_load */
233 static int sel_make_bools(void);
234
235 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
236 size_t count, loff_t *ppos)
237 {
238 char tmpbuf[TMPBUFLEN];
239 ssize_t length;
240
241 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
242 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
243 }
244
245 static const struct file_operations sel_mls_ops = {
246 .read = sel_read_mls,
247 };
248
249 static ssize_t sel_write_load(struct file * file, const char __user * buf,
250 size_t count, loff_t *ppos)
251
252 {
253 int ret;
254 ssize_t length;
255 void *data = NULL;
256
257 mutex_lock(&sel_mutex);
258
259 length = task_has_security(current, SECURITY__LOAD_POLICY);
260 if (length)
261 goto out;
262
263 if (*ppos != 0) {
264 /* No partial writes. */
265 length = -EINVAL;
266 goto out;
267 }
268
269 if ((count > 64 * 1024 * 1024)
270 || (data = vmalloc(count)) == NULL) {
271 length = -ENOMEM;
272 goto out;
273 }
274
275 length = -EFAULT;
276 if (copy_from_user(data, buf, count) != 0)
277 goto out;
278
279 length = security_load_policy(data, count);
280 if (length)
281 goto out;
282
283 ret = sel_make_bools();
284 if (ret)
285 length = ret;
286 else
287 length = count;
288 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
289 "policy loaded auid=%u",
290 audit_get_loginuid(current->audit_context));
291 out:
292 mutex_unlock(&sel_mutex);
293 vfree(data);
294 return length;
295 }
296
297 static const struct file_operations sel_load_ops = {
298 .write = sel_write_load,
299 };
300
301 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
302 {
303 char *canon;
304 u32 sid, len;
305 ssize_t length;
306
307 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
308 if (length)
309 return length;
310
311 length = security_context_to_sid(buf, size, &sid);
312 if (length < 0)
313 return length;
314
315 length = security_sid_to_context(sid, &canon, &len);
316 if (length < 0)
317 return length;
318
319 if (len > SIMPLE_TRANSACTION_LIMIT) {
320 printk(KERN_ERR "%s: context size (%u) exceeds payload "
321 "max\n", __FUNCTION__, len);
322 length = -ERANGE;
323 goto out;
324 }
325
326 memcpy(buf, canon, len);
327 length = len;
328 out:
329 kfree(canon);
330 return length;
331 }
332
333 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
334 size_t count, loff_t *ppos)
335 {
336 char tmpbuf[TMPBUFLEN];
337 ssize_t length;
338
339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
341 }
342
343 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
344 size_t count, loff_t *ppos)
345 {
346 char *page;
347 ssize_t length;
348 unsigned int new_value;
349
350 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
351 if (length)
352 return length;
353
354 if (count >= PAGE_SIZE)
355 return -ENOMEM;
356 if (*ppos != 0) {
357 /* No partial writes. */
358 return -EINVAL;
359 }
360 page = (char*)get_zeroed_page(GFP_KERNEL);
361 if (!page)
362 return -ENOMEM;
363 length = -EFAULT;
364 if (copy_from_user(page, buf, count))
365 goto out;
366
367 length = -EINVAL;
368 if (sscanf(page, "%u", &new_value) != 1)
369 goto out;
370
371 selinux_checkreqprot = new_value ? 1 : 0;
372 length = count;
373 out:
374 free_page((unsigned long) page);
375 return length;
376 }
377 static const struct file_operations sel_checkreqprot_ops = {
378 .read = sel_read_checkreqprot,
379 .write = sel_write_checkreqprot,
380 };
381
382 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
383 size_t count, loff_t *ppos)
384 {
385 char tmpbuf[TMPBUFLEN];
386 ssize_t length;
387
388 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
389 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
390 }
391
392 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
393 size_t count, loff_t *ppos)
394 {
395 char *page;
396 ssize_t length;
397 int new_value;
398
399 length = task_has_security(current, SECURITY__LOAD_POLICY);
400 if (length)
401 return length;
402
403 if (count >= PAGE_SIZE)
404 return -ENOMEM;
405 if (*ppos != 0) {
406 /* No partial writes. */
407 return -EINVAL;
408 }
409 page = (char*)get_zeroed_page(GFP_KERNEL);
410 if (!page)
411 return -ENOMEM;
412 length = -EFAULT;
413 if (copy_from_user(page, buf, count))
414 goto out;
415
416 length = -EINVAL;
417 if (sscanf(page, "%d", &new_value) != 1)
418 goto out;
419
420 selinux_compat_net = new_value ? 1 : 0;
421 length = count;
422 out:
423 free_page((unsigned long) page);
424 return length;
425 }
426 static const struct file_operations sel_compat_net_ops = {
427 .read = sel_read_compat_net,
428 .write = sel_write_compat_net,
429 };
430
431 /*
432 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
433 */
434 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
435 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
436 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
437 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
438 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
439
440 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
441 [SEL_ACCESS] = sel_write_access,
442 [SEL_CREATE] = sel_write_create,
443 [SEL_RELABEL] = sel_write_relabel,
444 [SEL_USER] = sel_write_user,
445 [SEL_MEMBER] = sel_write_member,
446 [SEL_CONTEXT] = sel_write_context,
447 };
448
449 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
450 {
451 ino_t ino = file->f_path.dentry->d_inode->i_ino;
452 char *data;
453 ssize_t rv;
454
455 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
456 return -EINVAL;
457
458 data = simple_transaction_get(file, buf, size);
459 if (IS_ERR(data))
460 return PTR_ERR(data);
461
462 rv = write_op[ino](file, data, size);
463 if (rv>0) {
464 simple_transaction_set(file, rv);
465 rv = size;
466 }
467 return rv;
468 }
469
470 static const struct file_operations transaction_ops = {
471 .write = selinux_transaction_write,
472 .read = simple_transaction_read,
473 .release = simple_transaction_release,
474 };
475
476 /*
477 * payload - write methods
478 * If the method has a response, the response should be put in buf,
479 * and the length returned. Otherwise return 0 or and -error.
480 */
481
482 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
483 {
484 char *scon, *tcon;
485 u32 ssid, tsid;
486 u16 tclass;
487 u32 req;
488 struct av_decision avd;
489 ssize_t length;
490
491 length = task_has_security(current, SECURITY__COMPUTE_AV);
492 if (length)
493 return length;
494
495 length = -ENOMEM;
496 scon = kzalloc(size+1, GFP_KERNEL);
497 if (!scon)
498 return length;
499
500 tcon = kzalloc(size+1, GFP_KERNEL);
501 if (!tcon)
502 goto out;
503
504 length = -EINVAL;
505 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
506 goto out2;
507
508 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
509 if (length < 0)
510 goto out2;
511 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
512 if (length < 0)
513 goto out2;
514
515 length = security_compute_av(ssid, tsid, tclass, req, &avd);
516 if (length < 0)
517 goto out2;
518
519 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
520 "%x %x %x %x %u",
521 avd.allowed, avd.decided,
522 avd.auditallow, avd.auditdeny,
523 avd.seqno);
524 out2:
525 kfree(tcon);
526 out:
527 kfree(scon);
528 return length;
529 }
530
531 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
532 {
533 char *scon, *tcon;
534 u32 ssid, tsid, newsid;
535 u16 tclass;
536 ssize_t length;
537 char *newcon;
538 u32 len;
539
540 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
541 if (length)
542 return length;
543
544 length = -ENOMEM;
545 scon = kzalloc(size+1, GFP_KERNEL);
546 if (!scon)
547 return length;
548
549 tcon = kzalloc(size+1, GFP_KERNEL);
550 if (!tcon)
551 goto out;
552
553 length = -EINVAL;
554 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
555 goto out2;
556
557 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
558 if (length < 0)
559 goto out2;
560 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
561 if (length < 0)
562 goto out2;
563
564 length = security_transition_sid(ssid, tsid, tclass, &newsid);
565 if (length < 0)
566 goto out2;
567
568 length = security_sid_to_context(newsid, &newcon, &len);
569 if (length < 0)
570 goto out2;
571
572 if (len > SIMPLE_TRANSACTION_LIMIT) {
573 printk(KERN_ERR "%s: context size (%u) exceeds payload "
574 "max\n", __FUNCTION__, len);
575 length = -ERANGE;
576 goto out3;
577 }
578
579 memcpy(buf, newcon, len);
580 length = len;
581 out3:
582 kfree(newcon);
583 out2:
584 kfree(tcon);
585 out:
586 kfree(scon);
587 return length;
588 }
589
590 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
591 {
592 char *scon, *tcon;
593 u32 ssid, tsid, newsid;
594 u16 tclass;
595 ssize_t length;
596 char *newcon;
597 u32 len;
598
599 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
600 if (length)
601 return length;
602
603 length = -ENOMEM;
604 scon = kzalloc(size+1, GFP_KERNEL);
605 if (!scon)
606 return length;
607
608 tcon = kzalloc(size+1, GFP_KERNEL);
609 if (!tcon)
610 goto out;
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_change_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 length = -ERANGE;
633 goto out3;
634 }
635
636 memcpy(buf, newcon, len);
637 length = len;
638 out3:
639 kfree(newcon);
640 out2:
641 kfree(tcon);
642 out:
643 kfree(scon);
644 return length;
645 }
646
647 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
648 {
649 char *con, *user, *ptr;
650 u32 sid, *sids;
651 ssize_t length;
652 char *newcon;
653 int i, rc;
654 u32 len, nsids;
655
656 length = task_has_security(current, SECURITY__COMPUTE_USER);
657 if (length)
658 return length;
659
660 length = -ENOMEM;
661 con = kzalloc(size+1, GFP_KERNEL);
662 if (!con)
663 return length;
664
665 user = kzalloc(size+1, GFP_KERNEL);
666 if (!user)
667 goto out;
668
669 length = -EINVAL;
670 if (sscanf(buf, "%s %s", con, user) != 2)
671 goto out2;
672
673 length = security_context_to_sid(con, strlen(con)+1, &sid);
674 if (length < 0)
675 goto out2;
676
677 length = security_get_user_sids(sid, user, &sids, &nsids);
678 if (length < 0)
679 goto out2;
680
681 length = sprintf(buf, "%u", nsids) + 1;
682 ptr = buf + length;
683 for (i = 0; i < nsids; i++) {
684 rc = security_sid_to_context(sids[i], &newcon, &len);
685 if (rc) {
686 length = rc;
687 goto out3;
688 }
689 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
690 kfree(newcon);
691 length = -ERANGE;
692 goto out3;
693 }
694 memcpy(ptr, newcon, len);
695 kfree(newcon);
696 ptr += len;
697 length += len;
698 }
699 out3:
700 kfree(sids);
701 out2:
702 kfree(user);
703 out:
704 kfree(con);
705 return length;
706 }
707
708 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
709 {
710 char *scon, *tcon;
711 u32 ssid, tsid, newsid;
712 u16 tclass;
713 ssize_t length;
714 char *newcon;
715 u32 len;
716
717 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
718 if (length)
719 return length;
720
721 length = -ENOMEM;
722 scon = kzalloc(size+1, GFP_KERNEL);
723 if (!scon)
724 return length;
725
726 tcon = kzalloc(size+1, GFP_KERNEL);
727 if (!tcon)
728 goto out;
729
730 length = -EINVAL;
731 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
732 goto out2;
733
734 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
735 if (length < 0)
736 goto out2;
737 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
738 if (length < 0)
739 goto out2;
740
741 length = security_member_sid(ssid, tsid, tclass, &newsid);
742 if (length < 0)
743 goto out2;
744
745 length = security_sid_to_context(newsid, &newcon, &len);
746 if (length < 0)
747 goto out2;
748
749 if (len > SIMPLE_TRANSACTION_LIMIT) {
750 printk(KERN_ERR "%s: context size (%u) exceeds payload "
751 "max\n", __FUNCTION__, len);
752 length = -ERANGE;
753 goto out3;
754 }
755
756 memcpy(buf, newcon, len);
757 length = len;
758 out3:
759 kfree(newcon);
760 out2:
761 kfree(tcon);
762 out:
763 kfree(scon);
764 return length;
765 }
766
767 static struct inode *sel_make_inode(struct super_block *sb, int mode)
768 {
769 struct inode *ret = new_inode(sb);
770
771 if (ret) {
772 ret->i_mode = mode;
773 ret->i_uid = ret->i_gid = 0;
774 ret->i_blocks = 0;
775 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
776 }
777 return ret;
778 }
779
780 #define BOOL_INO_OFFSET 30
781
782 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
783 size_t count, loff_t *ppos)
784 {
785 char *page = NULL;
786 ssize_t length;
787 ssize_t ret;
788 int cur_enforcing;
789 struct inode *inode;
790
791 mutex_lock(&sel_mutex);
792
793 ret = -EFAULT;
794
795 /* check to see if this file has been deleted */
796 if (!filep->f_op)
797 goto out;
798
799 if (count > PAGE_SIZE) {
800 ret = -EINVAL;
801 goto out;
802 }
803 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
804 ret = -ENOMEM;
805 goto out;
806 }
807
808 inode = filep->f_path.dentry->d_inode;
809 cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
810 if (cur_enforcing < 0) {
811 ret = cur_enforcing;
812 goto out;
813 }
814
815 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
816 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
817 ret = simple_read_from_buffer(buf, count, ppos, page, length);
818 out:
819 mutex_unlock(&sel_mutex);
820 if (page)
821 free_page((unsigned long)page);
822 return ret;
823 }
824
825 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
826 size_t count, loff_t *ppos)
827 {
828 char *page = NULL;
829 ssize_t length = -EFAULT;
830 int new_value;
831 struct inode *inode;
832
833 mutex_lock(&sel_mutex);
834
835 length = task_has_security(current, SECURITY__SETBOOL);
836 if (length)
837 goto out;
838
839 /* check to see if this file has been deleted */
840 if (!filep->f_op)
841 goto out;
842
843 if (count >= PAGE_SIZE) {
844 length = -ENOMEM;
845 goto out;
846 }
847 if (*ppos != 0) {
848 /* No partial writes. */
849 goto out;
850 }
851 page = (char*)get_zeroed_page(GFP_KERNEL);
852 if (!page) {
853 length = -ENOMEM;
854 goto out;
855 }
856
857 if (copy_from_user(page, buf, count))
858 goto out;
859
860 length = -EINVAL;
861 if (sscanf(page, "%d", &new_value) != 1)
862 goto out;
863
864 if (new_value)
865 new_value = 1;
866
867 inode = filep->f_path.dentry->d_inode;
868 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
869 length = count;
870
871 out:
872 mutex_unlock(&sel_mutex);
873 if (page)
874 free_page((unsigned long) page);
875 return length;
876 }
877
878 static const struct file_operations sel_bool_ops = {
879 .read = sel_read_bool,
880 .write = sel_write_bool,
881 };
882
883 static ssize_t sel_commit_bools_write(struct file *filep,
884 const char __user *buf,
885 size_t count, loff_t *ppos)
886 {
887 char *page = NULL;
888 ssize_t length = -EFAULT;
889 int new_value;
890
891 mutex_lock(&sel_mutex);
892
893 length = task_has_security(current, SECURITY__SETBOOL);
894 if (length)
895 goto out;
896
897 /* check to see if this file has been deleted */
898 if (!filep->f_op)
899 goto out;
900
901 if (count >= PAGE_SIZE) {
902 length = -ENOMEM;
903 goto out;
904 }
905 if (*ppos != 0) {
906 /* No partial writes. */
907 goto out;
908 }
909 page = (char*)get_zeroed_page(GFP_KERNEL);
910 if (!page) {
911 length = -ENOMEM;
912 goto out;
913 }
914
915 if (copy_from_user(page, buf, count))
916 goto out;
917
918 length = -EINVAL;
919 if (sscanf(page, "%d", &new_value) != 1)
920 goto out;
921
922 if (new_value && bool_pending_values) {
923 security_set_bools(bool_num, bool_pending_values);
924 }
925
926 length = count;
927
928 out:
929 mutex_unlock(&sel_mutex);
930 if (page)
931 free_page((unsigned long) page);
932 return length;
933 }
934
935 static const struct file_operations sel_commit_bools_ops = {
936 .write = sel_commit_bools_write,
937 };
938
939 /* delete booleans - partial revoke() from
940 * fs/proc/generic.c proc_kill_inodes */
941 static void sel_remove_bools(struct dentry *de)
942 {
943 struct list_head *p, *node;
944 struct super_block *sb = de->d_sb;
945
946 spin_lock(&dcache_lock);
947 node = de->d_subdirs.next;
948 while (node != &de->d_subdirs) {
949 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
950 list_del_init(node);
951
952 if (d->d_inode) {
953 d = dget_locked(d);
954 spin_unlock(&dcache_lock);
955 d_delete(d);
956 simple_unlink(de->d_inode, d);
957 dput(d);
958 spin_lock(&dcache_lock);
959 }
960 node = de->d_subdirs.next;
961 }
962
963 spin_unlock(&dcache_lock);
964
965 file_list_lock();
966 list_for_each(p, &sb->s_files) {
967 struct file * filp = list_entry(p, struct file, f_u.fu_list);
968 struct dentry * dentry = filp->f_path.dentry;
969
970 if (dentry->d_parent != de) {
971 continue;
972 }
973 filp->f_op = NULL;
974 }
975 file_list_unlock();
976 }
977
978 #define BOOL_DIR_NAME "booleans"
979
980 static int sel_make_bools(void)
981 {
982 int i, ret = 0;
983 ssize_t len;
984 struct dentry *dentry = NULL;
985 struct dentry *dir = bool_dir;
986 struct inode *inode = NULL;
987 struct inode_security_struct *isec;
988 char **names = NULL, *page;
989 int num;
990 int *values = NULL;
991 u32 sid;
992
993 /* remove any existing files */
994 kfree(bool_pending_values);
995 bool_pending_values = NULL;
996
997 sel_remove_bools(dir);
998
999 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1000 return -ENOMEM;
1001
1002 ret = security_get_bools(&num, &names, &values);
1003 if (ret != 0)
1004 goto out;
1005
1006 for (i = 0; i < num; i++) {
1007 dentry = d_alloc_name(dir, names[i]);
1008 if (!dentry) {
1009 ret = -ENOMEM;
1010 goto err;
1011 }
1012 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1013 if (!inode) {
1014 ret = -ENOMEM;
1015 goto err;
1016 }
1017
1018 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1019 if (len < 0) {
1020 ret = -EINVAL;
1021 goto err;
1022 } else if (len >= PAGE_SIZE) {
1023 ret = -ENAMETOOLONG;
1024 goto err;
1025 }
1026 isec = (struct inode_security_struct*)inode->i_security;
1027 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1028 goto err;
1029 isec->sid = sid;
1030 isec->initialized = 1;
1031 inode->i_fop = &sel_bool_ops;
1032 inode->i_ino = i + BOOL_INO_OFFSET;
1033 d_add(dentry, inode);
1034 }
1035 bool_num = num;
1036 bool_pending_values = values;
1037 out:
1038 free_page((unsigned long)page);
1039 if (names) {
1040 for (i = 0; i < num; i++)
1041 kfree(names[i]);
1042 kfree(names);
1043 }
1044 return ret;
1045 err:
1046 kfree(values);
1047 sel_remove_bools(dir);
1048 ret = -ENOMEM;
1049 goto out;
1050 }
1051
1052 #define NULL_FILE_NAME "null"
1053
1054 struct dentry *selinux_null = NULL;
1055
1056 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1057 size_t count, loff_t *ppos)
1058 {
1059 char tmpbuf[TMPBUFLEN];
1060 ssize_t length;
1061
1062 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1063 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1064 }
1065
1066 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1067 const char __user * buf,
1068 size_t count, loff_t *ppos)
1069
1070 {
1071 char *page;
1072 ssize_t ret;
1073 int new_value;
1074
1075 if (count >= PAGE_SIZE) {
1076 ret = -ENOMEM;
1077 goto out;
1078 }
1079
1080 if (*ppos != 0) {
1081 /* No partial writes. */
1082 ret = -EINVAL;
1083 goto out;
1084 }
1085
1086 page = (char*)get_zeroed_page(GFP_KERNEL);
1087 if (!page) {
1088 ret = -ENOMEM;
1089 goto out;
1090 }
1091
1092 if (copy_from_user(page, buf, count)) {
1093 ret = -EFAULT;
1094 goto out_free;
1095 }
1096
1097 if (sscanf(page, "%u", &new_value) != 1) {
1098 ret = -EINVAL;
1099 goto out;
1100 }
1101
1102 if (new_value != avc_cache_threshold) {
1103 ret = task_has_security(current, SECURITY__SETSECPARAM);
1104 if (ret)
1105 goto out_free;
1106 avc_cache_threshold = new_value;
1107 }
1108 ret = count;
1109 out_free:
1110 free_page((unsigned long)page);
1111 out:
1112 return ret;
1113 }
1114
1115 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1116 size_t count, loff_t *ppos)
1117 {
1118 char *page;
1119 ssize_t ret = 0;
1120
1121 page = (char *)__get_free_page(GFP_KERNEL);
1122 if (!page) {
1123 ret = -ENOMEM;
1124 goto out;
1125 }
1126 ret = avc_get_hash_stats(page);
1127 if (ret >= 0)
1128 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1129 free_page((unsigned long)page);
1130 out:
1131 return ret;
1132 }
1133
1134 static const struct file_operations sel_avc_cache_threshold_ops = {
1135 .read = sel_read_avc_cache_threshold,
1136 .write = sel_write_avc_cache_threshold,
1137 };
1138
1139 static const struct file_operations sel_avc_hash_stats_ops = {
1140 .read = sel_read_avc_hash_stats,
1141 };
1142
1143 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1144 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1145 {
1146 int cpu;
1147
1148 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1149 if (!cpu_possible(cpu))
1150 continue;
1151 *idx = cpu + 1;
1152 return &per_cpu(avc_cache_stats, cpu);
1153 }
1154 return NULL;
1155 }
1156
1157 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1158 {
1159 loff_t n = *pos - 1;
1160
1161 if (*pos == 0)
1162 return SEQ_START_TOKEN;
1163
1164 return sel_avc_get_stat_idx(&n);
1165 }
1166
1167 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1168 {
1169 return sel_avc_get_stat_idx(pos);
1170 }
1171
1172 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1173 {
1174 struct avc_cache_stats *st = v;
1175
1176 if (v == SEQ_START_TOKEN)
1177 seq_printf(seq, "lookups hits misses allocations reclaims "
1178 "frees\n");
1179 else
1180 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1181 st->hits, st->misses, st->allocations,
1182 st->reclaims, st->frees);
1183 return 0;
1184 }
1185
1186 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1187 { }
1188
1189 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1190 .start = sel_avc_stats_seq_start,
1191 .next = sel_avc_stats_seq_next,
1192 .show = sel_avc_stats_seq_show,
1193 .stop = sel_avc_stats_seq_stop,
1194 };
1195
1196 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1197 {
1198 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1199 }
1200
1201 static const struct file_operations sel_avc_cache_stats_ops = {
1202 .open = sel_open_avc_cache_stats,
1203 .read = seq_read,
1204 .llseek = seq_lseek,
1205 .release = seq_release,
1206 };
1207 #endif
1208
1209 static int sel_make_avc_files(struct dentry *dir)
1210 {
1211 int i, ret = 0;
1212 static struct tree_descr files[] = {
1213 { "cache_threshold",
1214 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1215 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1216 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1217 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1218 #endif
1219 };
1220
1221 for (i = 0; i < ARRAY_SIZE(files); i++) {
1222 struct inode *inode;
1223 struct dentry *dentry;
1224
1225 dentry = d_alloc_name(dir, files[i].name);
1226 if (!dentry) {
1227 ret = -ENOMEM;
1228 goto out;
1229 }
1230
1231 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1232 if (!inode) {
1233 ret = -ENOMEM;
1234 goto out;
1235 }
1236 inode->i_fop = files[i].ops;
1237 d_add(dentry, inode);
1238 }
1239 out:
1240 return ret;
1241 }
1242
1243 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1244 {
1245 int ret = 0;
1246 struct inode *inode;
1247
1248 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1249 if (!inode) {
1250 ret = -ENOMEM;
1251 goto out;
1252 }
1253 inode->i_op = &simple_dir_inode_operations;
1254 inode->i_fop = &simple_dir_operations;
1255 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1256 inc_nlink(inode);
1257 d_add(dentry, inode);
1258 /* bump link count on parent directory, too */
1259 inc_nlink(dir);
1260 out:
1261 return ret;
1262 }
1263
1264 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1265 {
1266 int ret;
1267 struct dentry *dentry;
1268 struct inode *inode, *root_inode;
1269 struct inode_security_struct *isec;
1270
1271 static struct tree_descr selinux_files[] = {
1272 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1273 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1274 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1275 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1276 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1277 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1278 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1279 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1280 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1281 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1282 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1283 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1284 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1285 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1286 /* last one */ {""}
1287 };
1288 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1289 if (ret)
1290 goto err;
1291
1292 root_inode = sb->s_root->d_inode;
1293
1294 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1295 if (!dentry) {
1296 ret = -ENOMEM;
1297 goto err;
1298 }
1299
1300 ret = sel_make_dir(root_inode, dentry);
1301 if (ret)
1302 goto err;
1303
1304 bool_dir = dentry;
1305
1306 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1307 if (!dentry) {
1308 ret = -ENOMEM;
1309 goto err;
1310 }
1311
1312 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1313 if (!inode) {
1314 ret = -ENOMEM;
1315 goto err;
1316 }
1317 isec = (struct inode_security_struct*)inode->i_security;
1318 isec->sid = SECINITSID_DEVNULL;
1319 isec->sclass = SECCLASS_CHR_FILE;
1320 isec->initialized = 1;
1321
1322 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1323 d_add(dentry, inode);
1324 selinux_null = dentry;
1325
1326 dentry = d_alloc_name(sb->s_root, "avc");
1327 if (!dentry) {
1328 ret = -ENOMEM;
1329 goto err;
1330 }
1331
1332 ret = sel_make_dir(root_inode, dentry);
1333 if (ret)
1334 goto err;
1335
1336 ret = sel_make_avc_files(dentry);
1337 if (ret)
1338 goto err;
1339 out:
1340 return ret;
1341 err:
1342 printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
1343 goto out;
1344 }
1345
1346 static int sel_get_sb(struct file_system_type *fs_type,
1347 int flags, const char *dev_name, void *data,
1348 struct vfsmount *mnt)
1349 {
1350 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1351 }
1352
1353 static struct file_system_type sel_fs_type = {
1354 .name = "selinuxfs",
1355 .get_sb = sel_get_sb,
1356 .kill_sb = kill_litter_super,
1357 };
1358
1359 struct vfsmount *selinuxfs_mount;
1360
1361 static int __init init_sel_fs(void)
1362 {
1363 int err;
1364
1365 if (!selinux_enabled)
1366 return 0;
1367 err = register_filesystem(&sel_fs_type);
1368 if (!err) {
1369 selinuxfs_mount = kern_mount(&sel_fs_type);
1370 if (IS_ERR(selinuxfs_mount)) {
1371 printk(KERN_ERR "selinuxfs: could not mount!\n");
1372 err = PTR_ERR(selinuxfs_mount);
1373 selinuxfs_mount = NULL;
1374 }
1375 }
1376 return err;
1377 }
1378
1379 __initcall(init_sel_fs);
1380
1381 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1382 void exit_sel_fs(void)
1383 {
1384 unregister_filesystem(&sel_fs_type);
1385 }
1386 #endif
Linux with added FPC-III support