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[PATCH] zfcp: fix incorrect usage of erp_lock
[linux-2.6/mini2440.git] / security / selinux / selinuxfs.c
blob00534c302ba2b11939807dd5668f3530cd73fd96
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 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 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 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 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 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 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 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_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 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_blksize = PAGE_CACHE_SIZE;
775 ret->i_blocks = 0;
776 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
777 }
778 return ret;
779 }
780
781 #define BOOL_INO_OFFSET 30
782
783 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
784 size_t count, loff_t *ppos)
785 {
786 char *page = NULL;
787 ssize_t length;
788 ssize_t ret;
789 int cur_enforcing;
790 struct inode *inode;
791
792 mutex_lock(&sel_mutex);
793
794 ret = -EFAULT;
795
796 /* check to see if this file has been deleted */
797 if (!filep->f_op)
798 goto out;
799
800 if (count > PAGE_SIZE) {
801 ret = -EINVAL;
802 goto out;
803 }
804 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
805 ret = -ENOMEM;
806 goto out;
807 }
808
809 inode = filep->f_dentry->d_inode;
810 cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
811 if (cur_enforcing < 0) {
812 ret = cur_enforcing;
813 goto out;
814 }
815
816 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
817 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
818 ret = simple_read_from_buffer(buf, count, ppos, page, length);
819 out:
820 mutex_unlock(&sel_mutex);
821 if (page)
822 free_page((unsigned long)page);
823 return ret;
824 }
825
826 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
827 size_t count, loff_t *ppos)
828 {
829 char *page = NULL;
830 ssize_t length = -EFAULT;
831 int new_value;
832 struct inode *inode;
833
834 mutex_lock(&sel_mutex);
835
836 length = task_has_security(current, SECURITY__SETBOOL);
837 if (length)
838 goto out;
839
840 /* check to see if this file has been deleted */
841 if (!filep->f_op)
842 goto out;
843
844 if (count >= PAGE_SIZE) {
845 length = -ENOMEM;
846 goto out;
847 }
848 if (*ppos != 0) {
849 /* No partial writes. */
850 goto out;
851 }
852 page = (char*)get_zeroed_page(GFP_KERNEL);
853 if (!page) {
854 length = -ENOMEM;
855 goto out;
856 }
857
858 if (copy_from_user(page, buf, count))
859 goto out;
860
861 length = -EINVAL;
862 if (sscanf(page, "%d", &new_value) != 1)
863 goto out;
864
865 if (new_value)
866 new_value = 1;
867
868 inode = filep->f_dentry->d_inode;
869 bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
870 length = count;
871
872 out:
873 mutex_unlock(&sel_mutex);
874 if (page)
875 free_page((unsigned long) page);
876 return length;
877 }
878
879 static struct file_operations sel_bool_ops = {
880 .read = sel_read_bool,
881 .write = sel_write_bool,
882 };
883
884 static ssize_t sel_commit_bools_write(struct file *filep,
885 const char __user *buf,
886 size_t count, loff_t *ppos)
887 {
888 char *page = NULL;
889 ssize_t length = -EFAULT;
890 int new_value;
891
892 mutex_lock(&sel_mutex);
893
894 length = task_has_security(current, SECURITY__SETBOOL);
895 if (length)
896 goto out;
897
898 /* check to see if this file has been deleted */
899 if (!filep->f_op)
900 goto out;
901
902 if (count >= PAGE_SIZE) {
903 length = -ENOMEM;
904 goto out;
905 }
906 if (*ppos != 0) {
907 /* No partial writes. */
908 goto out;
909 }
910 page = (char*)get_zeroed_page(GFP_KERNEL);
911 if (!page) {
912 length = -ENOMEM;
913 goto out;
914 }
915
916 if (copy_from_user(page, buf, count))
917 goto out;
918
919 length = -EINVAL;
920 if (sscanf(page, "%d", &new_value) != 1)
921 goto out;
922
923 if (new_value && bool_pending_values) {
924 security_set_bools(bool_num, bool_pending_values);
925 }
926
927 length = count;
928
929 out:
930 mutex_unlock(&sel_mutex);
931 if (page)
932 free_page((unsigned long) page);
933 return length;
934 }
935
936 static struct file_operations sel_commit_bools_ops = {
937 .write = sel_commit_bools_write,
938 };
939
940 /* delete booleans - partial revoke() from
941 * fs/proc/generic.c proc_kill_inodes */
942 static void sel_remove_bools(struct dentry *de)
943 {
944 struct list_head *p, *node;
945 struct super_block *sb = de->d_sb;
946
947 spin_lock(&dcache_lock);
948 node = de->d_subdirs.next;
949 while (node != &de->d_subdirs) {
950 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
951 list_del_init(node);
952
953 if (d->d_inode) {
954 d = dget_locked(d);
955 spin_unlock(&dcache_lock);
956 d_delete(d);
957 simple_unlink(de->d_inode, d);
958 dput(d);
959 spin_lock(&dcache_lock);
960 }
961 node = de->d_subdirs.next;
962 }
963
964 spin_unlock(&dcache_lock);
965
966 file_list_lock();
967 list_for_each(p, &sb->s_files) {
968 struct file * filp = list_entry(p, struct file, f_u.fu_list);
969 struct dentry * dentry = filp->f_dentry;
970
971 if (dentry->d_parent != de) {
972 continue;
973 }
974 filp->f_op = NULL;
975 }
976 file_list_unlock();
977 }
978
979 #define BOOL_DIR_NAME "booleans"
980
981 static int sel_make_bools(void)
982 {
983 int i, ret = 0;
984 ssize_t len;
985 struct dentry *dentry = NULL;
986 struct dentry *dir = bool_dir;
987 struct inode *inode = NULL;
988 struct inode_security_struct *isec;
989 char **names = NULL, *page;
990 int num;
991 int *values = NULL;
992 u32 sid;
993
994 /* remove any existing files */
995 kfree(bool_pending_values);
996 bool_pending_values = NULL;
997
998 sel_remove_bools(dir);
999
1000 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1001 return -ENOMEM;
1002
1003 ret = security_get_bools(&num, &names, &values);
1004 if (ret != 0)
1005 goto out;
1006
1007 for (i = 0; i < num; i++) {
1008 dentry = d_alloc_name(dir, names[i]);
1009 if (!dentry) {
1010 ret = -ENOMEM;
1011 goto err;
1012 }
1013 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1014 if (!inode) {
1015 ret = -ENOMEM;
1016 goto err;
1017 }
1018
1019 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1020 if (len < 0) {
1021 ret = -EINVAL;
1022 goto err;
1023 } else if (len >= PAGE_SIZE) {
1024 ret = -ENAMETOOLONG;
1025 goto err;
1026 }
1027 isec = (struct inode_security_struct*)inode->i_security;
1028 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1029 goto err;
1030 isec->sid = sid;
1031 isec->initialized = 1;
1032 inode->i_fop = &sel_bool_ops;
1033 inode->i_ino = i + BOOL_INO_OFFSET;
1034 d_add(dentry, inode);
1035 }
1036 bool_num = num;
1037 bool_pending_values = values;
1038 out:
1039 free_page((unsigned long)page);
1040 if (names) {
1041 for (i = 0; i < num; i++)
1042 kfree(names[i]);
1043 kfree(names);
1044 }
1045 return ret;
1046 err:
1047 kfree(values);
1048 sel_remove_bools(dir);
1049 ret = -ENOMEM;
1050 goto out;
1051 }
1052
1053 #define NULL_FILE_NAME "null"
1054
1055 struct dentry *selinux_null = NULL;
1056
1057 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1058 size_t count, loff_t *ppos)
1059 {
1060 char tmpbuf[TMPBUFLEN];
1061 ssize_t length;
1062
1063 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1064 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1065 }
1066
1067 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1068 const char __user * buf,
1069 size_t count, loff_t *ppos)
1070
1071 {
1072 char *page;
1073 ssize_t ret;
1074 int new_value;
1075
1076 if (count >= PAGE_SIZE) {
1077 ret = -ENOMEM;
1078 goto out;
1079 }
1080
1081 if (*ppos != 0) {
1082 /* No partial writes. */
1083 ret = -EINVAL;
1084 goto out;
1085 }
1086
1087 page = (char*)get_zeroed_page(GFP_KERNEL);
1088 if (!page) {
1089 ret = -ENOMEM;
1090 goto out;
1091 }
1092
1093 if (copy_from_user(page, buf, count)) {
1094 ret = -EFAULT;
1095 goto out_free;
1096 }
1097
1098 if (sscanf(page, "%u", &new_value) != 1) {
1099 ret = -EINVAL;
1100 goto out;
1101 }
1102
1103 if (new_value != avc_cache_threshold) {
1104 ret = task_has_security(current, SECURITY__SETSECPARAM);
1105 if (ret)
1106 goto out_free;
1107 avc_cache_threshold = new_value;
1108 }
1109 ret = count;
1110 out_free:
1111 free_page((unsigned long)page);
1112 out:
1113 return ret;
1114 }
1115
1116 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1117 size_t count, loff_t *ppos)
1118 {
1119 char *page;
1120 ssize_t ret = 0;
1121
1122 page = (char *)__get_free_page(GFP_KERNEL);
1123 if (!page) {
1124 ret = -ENOMEM;
1125 goto out;
1126 }
1127 ret = avc_get_hash_stats(page);
1128 if (ret >= 0)
1129 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1130 free_page((unsigned long)page);
1131 out:
1132 return ret;
1133 }
1134
1135 static struct file_operations sel_avc_cache_threshold_ops = {
1136 .read = sel_read_avc_cache_threshold,
1137 .write = sel_write_avc_cache_threshold,
1138 };
1139
1140 static struct file_operations sel_avc_hash_stats_ops = {
1141 .read = sel_read_avc_hash_stats,
1142 };
1143
1144 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1145 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1146 {
1147 int cpu;
1148
1149 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1150 if (!cpu_possible(cpu))
1151 continue;
1152 *idx = cpu + 1;
1153 return &per_cpu(avc_cache_stats, cpu);
1154 }
1155 return NULL;
1156 }
1157
1158 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1159 {
1160 loff_t n = *pos - 1;
1161
1162 if (*pos == 0)
1163 return SEQ_START_TOKEN;
1164
1165 return sel_avc_get_stat_idx(&n);
1166 }
1167
1168 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1169 {
1170 return sel_avc_get_stat_idx(pos);
1171 }
1172
1173 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1174 {
1175 struct avc_cache_stats *st = v;
1176
1177 if (v == SEQ_START_TOKEN)
1178 seq_printf(seq, "lookups hits misses allocations reclaims "
1179 "frees\n");
1180 else
1181 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1182 st->hits, st->misses, st->allocations,
1183 st->reclaims, st->frees);
1184 return 0;
1185 }
1186
1187 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1188 { }
1189
1190 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1191 .start = sel_avc_stats_seq_start,
1192 .next = sel_avc_stats_seq_next,
1193 .show = sel_avc_stats_seq_show,
1194 .stop = sel_avc_stats_seq_stop,
1195 };
1196
1197 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1198 {
1199 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1200 }
1201
1202 static struct file_operations sel_avc_cache_stats_ops = {
1203 .open = sel_open_avc_cache_stats,
1204 .read = seq_read,
1205 .llseek = seq_lseek,
1206 .release = seq_release,
1207 };
1208 #endif
1209
1210 static int sel_make_avc_files(struct dentry *dir)
1211 {
1212 int i, ret = 0;
1213 static struct tree_descr files[] = {
1214 { "cache_threshold",
1215 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1216 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1217 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1218 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1219 #endif
1220 };
1221
1222 for (i = 0; i < ARRAY_SIZE(files); i++) {
1223 struct inode *inode;
1224 struct dentry *dentry;
1225
1226 dentry = d_alloc_name(dir, files[i].name);
1227 if (!dentry) {
1228 ret = -ENOMEM;
1229 goto out;
1230 }
1231
1232 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1233 if (!inode) {
1234 ret = -ENOMEM;
1235 goto out;
1236 }
1237 inode->i_fop = files[i].ops;
1238 d_add(dentry, inode);
1239 }
1240 out:
1241 return ret;
1242 }
1243
1244 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1245 {
1246 int ret = 0;
1247 struct inode *inode;
1248
1249 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1250 if (!inode) {
1251 ret = -ENOMEM;
1252 goto out;
1253 }
1254 inode->i_op = &simple_dir_inode_operations;
1255 inode->i_fop = &simple_dir_operations;
1256 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1257 inode->i_nlink++;
1258 d_add(dentry, inode);
1259 /* bump link count on parent directory, too */
1260 dir->i_nlink++;
1261 out:
1262 return ret;
1263 }
1264
1265 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1266 {
1267 int ret;
1268 struct dentry *dentry;
1269 struct inode *inode, *root_inode;
1270 struct inode_security_struct *isec;
1271
1272 static struct tree_descr selinux_files[] = {
1273 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1274 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1275 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1276 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1277 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1278 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1279 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1280 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1281 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1282 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1283 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1284 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1285 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1286 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1287 /* last one */ {""}
1288 };
1289 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1290 if (ret)
1291 goto err;
1292
1293 root_inode = sb->s_root->d_inode;
1294
1295 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1296 if (!dentry) {
1297 ret = -ENOMEM;
1298 goto err;
1299 }
1300
1301 ret = sel_make_dir(root_inode, dentry);
1302 if (ret)
1303 goto err;
1304
1305 bool_dir = dentry;
1306
1307 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1308 if (!dentry) {
1309 ret = -ENOMEM;
1310 goto err;
1311 }
1312
1313 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1314 if (!inode) {
1315 ret = -ENOMEM;
1316 goto err;
1317 }
1318 isec = (struct inode_security_struct*)inode->i_security;
1319 isec->sid = SECINITSID_DEVNULL;
1320 isec->sclass = SECCLASS_CHR_FILE;
1321 isec->initialized = 1;
1322
1323 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1324 d_add(dentry, inode);
1325 selinux_null = dentry;
1326
1327 dentry = d_alloc_name(sb->s_root, "avc");
1328 if (!dentry) {
1329 ret = -ENOMEM;
1330 goto err;
1331 }
1332
1333 ret = sel_make_dir(root_inode, dentry);
1334 if (ret)
1335 goto err;
1336
1337 ret = sel_make_avc_files(dentry);
1338 if (ret)
1339 goto err;
1340 out:
1341 return ret;
1342 err:
1343 printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
1344 goto out;
1345 }
1346
1347 static int sel_get_sb(struct file_system_type *fs_type,
1348 int flags, const char *dev_name, void *data,
1349 struct vfsmount *mnt)
1350 {
1351 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1352 }
1353
1354 static struct file_system_type sel_fs_type = {
1355 .name = "selinuxfs",
1356 .get_sb = sel_get_sb,
1357 .kill_sb = kill_litter_super,
1358 };
1359
1360 struct vfsmount *selinuxfs_mount;
1361
1362 static int __init init_sel_fs(void)
1363 {
1364 int err;
1365
1366 if (!selinux_enabled)
1367 return 0;
1368 err = register_filesystem(&sel_fs_type);
1369 if (!err) {
1370 selinuxfs_mount = kern_mount(&sel_fs_type);
1371 if (IS_ERR(selinuxfs_mount)) {
1372 printk(KERN_ERR "selinuxfs: could not mount!\n");
1373 err = PTR_ERR(selinuxfs_mount);
1374 selinuxfs_mount = NULL;
1375 }
1376 }
1377 return err;
1378 }
1379
1380 __initcall(init_sel_fs);
1381
1382 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1383 void exit_sel_fs(void)
1384 {
1385 unregister_filesystem(&sel_fs_type);
1386 }
1387 #endif
Support for the Chinese Samsung S3C2440 based development boards