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SELinux: remove unused av.decided field
[linux-2.6/mini2440.git] / security / selinux / selinuxfs.c
blobd3c8b982cfb0e179cb11d130318f3ebf3fd5b50d
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul.moore@hp.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31
32 /* selinuxfs pseudo filesystem for exporting the security policy API.
33 Based on the proc code and the fs/nfsd/nfsctl.c code. */
34
35 #include "flask.h"
36 #include "avc.h"
37 #include "avc_ss.h"
38 #include "security.h"
39 #include "objsec.h"
40 #include "conditional.h"
41
42 /* Policy capability filenames */
43 static char *policycap_names[] = {
44 "network_peer_controls",
45 "open_perms"
46 };
47
48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
49
50 int selinux_compat_net = 0;
51
52 static int __init checkreqprot_setup(char *str)
53 {
54 unsigned long checkreqprot;
55 if (!strict_strtoul(str, 0, &checkreqprot))
56 selinux_checkreqprot = checkreqprot ? 1 : 0;
57 return 1;
58 }
59 __setup("checkreqprot=", checkreqprot_setup);
60
61 static int __init selinux_compat_net_setup(char *str)
62 {
63 unsigned long compat_net;
64 if (!strict_strtoul(str, 0, &compat_net))
65 selinux_compat_net = compat_net ? 1 : 0;
66 return 1;
67 }
68 __setup("selinux_compat_net=", selinux_compat_net_setup);
69
70
71 static DEFINE_MUTEX(sel_mutex);
72
73 /* global data for booleans */
74 static struct dentry *bool_dir;
75 static int bool_num;
76 static char **bool_pending_names;
77 static int *bool_pending_values;
78
79 /* global data for classes */
80 static struct dentry *class_dir;
81 static unsigned long last_class_ino;
82
83 /* global data for policy capabilities */
84 static struct dentry *policycap_dir;
85
86 extern void selnl_notify_setenforce(int val);
87
88 /* Check whether a task is allowed to use a security operation. */
89 static int task_has_security(struct task_struct *tsk,
90 u32 perms)
91 {
92 const struct task_security_struct *tsec;
93 u32 sid = 0;
94
95 rcu_read_lock();
96 tsec = __task_cred(tsk)->security;
97 if (tsec)
98 sid = tsec->sid;
99 rcu_read_unlock();
100 if (!tsec)
101 return -EACCES;
102
103 return avc_has_perm(sid, SECINITSID_SECURITY,
104 SECCLASS_SECURITY, perms, NULL);
105 }
106
107 enum sel_inos {
108 SEL_ROOT_INO = 2,
109 SEL_LOAD, /* load policy */
110 SEL_ENFORCE, /* get or set enforcing status */
111 SEL_CONTEXT, /* validate context */
112 SEL_ACCESS, /* compute access decision */
113 SEL_CREATE, /* compute create labeling decision */
114 SEL_RELABEL, /* compute relabeling decision */
115 SEL_USER, /* compute reachable user contexts */
116 SEL_POLICYVERS, /* return policy version for this kernel */
117 SEL_COMMIT_BOOLS, /* commit new boolean values */
118 SEL_MLS, /* return if MLS policy is enabled */
119 SEL_DISABLE, /* disable SELinux until next reboot */
120 SEL_MEMBER, /* compute polyinstantiation membership decision */
121 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
122 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
123 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
124 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
125 SEL_INO_NEXT, /* The next inode number to use */
126 };
127
128 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
129
130 #define SEL_INITCON_INO_OFFSET 0x01000000
131 #define SEL_BOOL_INO_OFFSET 0x02000000
132 #define SEL_CLASS_INO_OFFSET 0x04000000
133 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
134 #define SEL_INO_MASK 0x00ffffff
135
136 #define TMPBUFLEN 12
137 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
138 size_t count, loff_t *ppos)
139 {
140 char tmpbuf[TMPBUFLEN];
141 ssize_t length;
142
143 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
144 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
145 }
146
147 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
148 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
149 size_t count, loff_t *ppos)
150
151 {
152 char *page;
153 ssize_t length;
154 int new_value;
155
156 if (count >= PAGE_SIZE)
157 return -ENOMEM;
158 if (*ppos != 0) {
159 /* No partial writes. */
160 return -EINVAL;
161 }
162 page = (char *)get_zeroed_page(GFP_KERNEL);
163 if (!page)
164 return -ENOMEM;
165 length = -EFAULT;
166 if (copy_from_user(page, buf, count))
167 goto out;
168
169 length = -EINVAL;
170 if (sscanf(page, "%d", &new_value) != 1)
171 goto out;
172
173 if (new_value != selinux_enforcing) {
174 length = task_has_security(current, SECURITY__SETENFORCE);
175 if (length)
176 goto out;
177 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
178 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
179 new_value, selinux_enforcing,
180 audit_get_loginuid(current),
181 audit_get_sessionid(current));
182 selinux_enforcing = new_value;
183 if (selinux_enforcing)
184 avc_ss_reset(0);
185 selnl_notify_setenforce(selinux_enforcing);
186 }
187 length = count;
188 out:
189 free_page((unsigned long) page);
190 return length;
191 }
192 #else
193 #define sel_write_enforce NULL
194 #endif
195
196 static const struct file_operations sel_enforce_ops = {
197 .read = sel_read_enforce,
198 .write = sel_write_enforce,
199 };
200
201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
202 size_t count, loff_t *ppos)
203 {
204 char tmpbuf[TMPBUFLEN];
205 ssize_t length;
206 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
207 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
208 security_get_reject_unknown() : !security_get_allow_unknown();
209
210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
212 }
213
214 static const struct file_operations sel_handle_unknown_ops = {
215 .read = sel_read_handle_unknown,
216 };
217
218 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
219 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
220 size_t count, loff_t *ppos)
221
222 {
223 char *page;
224 ssize_t length;
225 int new_value;
226 extern int selinux_disable(void);
227
228 if (count >= PAGE_SIZE)
229 return -ENOMEM;
230 if (*ppos != 0) {
231 /* No partial writes. */
232 return -EINVAL;
233 }
234 page = (char *)get_zeroed_page(GFP_KERNEL);
235 if (!page)
236 return -ENOMEM;
237 length = -EFAULT;
238 if (copy_from_user(page, buf, count))
239 goto out;
240
241 length = -EINVAL;
242 if (sscanf(page, "%d", &new_value) != 1)
243 goto out;
244
245 if (new_value) {
246 length = selinux_disable();
247 if (length < 0)
248 goto out;
249 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
250 "selinux=0 auid=%u ses=%u",
251 audit_get_loginuid(current),
252 audit_get_sessionid(current));
253 }
254
255 length = count;
256 out:
257 free_page((unsigned long) page);
258 return length;
259 }
260 #else
261 #define sel_write_disable NULL
262 #endif
263
264 static const struct file_operations sel_disable_ops = {
265 .write = sel_write_disable,
266 };
267
268 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
269 size_t count, loff_t *ppos)
270 {
271 char tmpbuf[TMPBUFLEN];
272 ssize_t length;
273
274 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
275 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
276 }
277
278 static const struct file_operations sel_policyvers_ops = {
279 .read = sel_read_policyvers,
280 };
281
282 /* declaration for sel_write_load */
283 static int sel_make_bools(void);
284 static int sel_make_classes(void);
285 static int sel_make_policycap(void);
286
287 /* declaration for sel_make_class_dirs */
288 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
289 unsigned long *ino);
290
291 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
292 size_t count, loff_t *ppos)
293 {
294 char tmpbuf[TMPBUFLEN];
295 ssize_t length;
296
297 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
298 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
299 }
300
301 static const struct file_operations sel_mls_ops = {
302 .read = sel_read_mls,
303 };
304
305 static ssize_t sel_write_load(struct file *file, const char __user *buf,
306 size_t count, loff_t *ppos)
307
308 {
309 int ret;
310 ssize_t length;
311 void *data = NULL;
312
313 mutex_lock(&sel_mutex);
314
315 length = task_has_security(current, SECURITY__LOAD_POLICY);
316 if (length)
317 goto out;
318
319 if (*ppos != 0) {
320 /* No partial writes. */
321 length = -EINVAL;
322 goto out;
323 }
324
325 if ((count > 64 * 1024 * 1024)
326 || (data = vmalloc(count)) == NULL) {
327 length = -ENOMEM;
328 goto out;
329 }
330
331 length = -EFAULT;
332 if (copy_from_user(data, buf, count) != 0)
333 goto out;
334
335 length = security_load_policy(data, count);
336 if (length)
337 goto out;
338
339 ret = sel_make_bools();
340 if (ret) {
341 length = ret;
342 goto out1;
343 }
344
345 ret = sel_make_classes();
346 if (ret) {
347 length = ret;
348 goto out1;
349 }
350
351 ret = sel_make_policycap();
352 if (ret)
353 length = ret;
354 else
355 length = count;
356
357 out1:
358 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
359 "policy loaded auid=%u ses=%u",
360 audit_get_loginuid(current),
361 audit_get_sessionid(current));
362 out:
363 mutex_unlock(&sel_mutex);
364 vfree(data);
365 return length;
366 }
367
368 static const struct file_operations sel_load_ops = {
369 .write = sel_write_load,
370 };
371
372 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
373 {
374 char *canon;
375 u32 sid, len;
376 ssize_t length;
377
378 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
379 if (length)
380 return length;
381
382 length = security_context_to_sid(buf, size, &sid);
383 if (length < 0)
384 return length;
385
386 length = security_sid_to_context(sid, &canon, &len);
387 if (length < 0)
388 return length;
389
390 if (len > SIMPLE_TRANSACTION_LIMIT) {
391 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
392 "payload max\n", __func__, len);
393 length = -ERANGE;
394 goto out;
395 }
396
397 memcpy(buf, canon, len);
398 length = len;
399 out:
400 kfree(canon);
401 return length;
402 }
403
404 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
405 size_t count, loff_t *ppos)
406 {
407 char tmpbuf[TMPBUFLEN];
408 ssize_t length;
409
410 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
411 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
412 }
413
414 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
415 size_t count, loff_t *ppos)
416 {
417 char *page;
418 ssize_t length;
419 unsigned int new_value;
420
421 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
422 if (length)
423 return length;
424
425 if (count >= PAGE_SIZE)
426 return -ENOMEM;
427 if (*ppos != 0) {
428 /* No partial writes. */
429 return -EINVAL;
430 }
431 page = (char *)get_zeroed_page(GFP_KERNEL);
432 if (!page)
433 return -ENOMEM;
434 length = -EFAULT;
435 if (copy_from_user(page, buf, count))
436 goto out;
437
438 length = -EINVAL;
439 if (sscanf(page, "%u", &new_value) != 1)
440 goto out;
441
442 selinux_checkreqprot = new_value ? 1 : 0;
443 length = count;
444 out:
445 free_page((unsigned long) page);
446 return length;
447 }
448 static const struct file_operations sel_checkreqprot_ops = {
449 .read = sel_read_checkreqprot,
450 .write = sel_write_checkreqprot,
451 };
452
453 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
454 size_t count, loff_t *ppos)
455 {
456 char tmpbuf[TMPBUFLEN];
457 ssize_t length;
458
459 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
460 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
461 }
462
463 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
464 size_t count, loff_t *ppos)
465 {
466 char *page;
467 ssize_t length;
468 int new_value;
469
470 length = task_has_security(current, SECURITY__LOAD_POLICY);
471 if (length)
472 return length;
473
474 if (count >= PAGE_SIZE)
475 return -ENOMEM;
476 if (*ppos != 0) {
477 /* No partial writes. */
478 return -EINVAL;
479 }
480 page = (char *)get_zeroed_page(GFP_KERNEL);
481 if (!page)
482 return -ENOMEM;
483 length = -EFAULT;
484 if (copy_from_user(page, buf, count))
485 goto out;
486
487 length = -EINVAL;
488 if (sscanf(page, "%d", &new_value) != 1)
489 goto out;
490
491 if (new_value) {
492 printk(KERN_NOTICE
493 "SELinux: compat_net is deprecated, please use secmark"
494 " instead\n");
495 selinux_compat_net = 1;
496 } else
497 selinux_compat_net = 0;
498 length = count;
499 out:
500 free_page((unsigned long) page);
501 return length;
502 }
503 static const struct file_operations sel_compat_net_ops = {
504 .read = sel_read_compat_net,
505 .write = sel_write_compat_net,
506 };
507
508 /*
509 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
510 */
511 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
512 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
513 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
514 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
515 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
516
517 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
518 [SEL_ACCESS] = sel_write_access,
519 [SEL_CREATE] = sel_write_create,
520 [SEL_RELABEL] = sel_write_relabel,
521 [SEL_USER] = sel_write_user,
522 [SEL_MEMBER] = sel_write_member,
523 [SEL_CONTEXT] = sel_write_context,
524 };
525
526 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
527 {
528 ino_t ino = file->f_path.dentry->d_inode->i_ino;
529 char *data;
530 ssize_t rv;
531
532 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
533 return -EINVAL;
534
535 data = simple_transaction_get(file, buf, size);
536 if (IS_ERR(data))
537 return PTR_ERR(data);
538
539 rv = write_op[ino](file, data, size);
540 if (rv > 0) {
541 simple_transaction_set(file, rv);
542 rv = size;
543 }
544 return rv;
545 }
546
547 static const struct file_operations transaction_ops = {
548 .write = selinux_transaction_write,
549 .read = simple_transaction_read,
550 .release = simple_transaction_release,
551 };
552
553 /*
554 * payload - write methods
555 * If the method has a response, the response should be put in buf,
556 * and the length returned. Otherwise return 0 or and -error.
557 */
558
559 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
560 {
561 char *scon, *tcon;
562 u32 ssid, tsid;
563 u16 tclass;
564 u32 req;
565 struct av_decision avd;
566 ssize_t length;
567
568 length = task_has_security(current, SECURITY__COMPUTE_AV);
569 if (length)
570 return length;
571
572 length = -ENOMEM;
573 scon = kzalloc(size+1, GFP_KERNEL);
574 if (!scon)
575 return length;
576
577 tcon = kzalloc(size+1, GFP_KERNEL);
578 if (!tcon)
579 goto out;
580
581 length = -EINVAL;
582 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
583 goto out2;
584
585 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
586 if (length < 0)
587 goto out2;
588 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
589 if (length < 0)
590 goto out2;
591
592 length = security_compute_av(ssid, tsid, tclass, req, &avd);
593 if (length < 0)
594 goto out2;
595
596 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
597 "%x %x %x %x %u",
598 avd.allowed, 0xffffffff,
599 avd.auditallow, avd.auditdeny,
600 avd.seqno);
601 out2:
602 kfree(tcon);
603 out:
604 kfree(scon);
605 return length;
606 }
607
608 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
609 {
610 char *scon, *tcon;
611 u32 ssid, tsid, newsid;
612 u16 tclass;
613 ssize_t length;
614 char *newcon;
615 u32 len;
616
617 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
618 if (length)
619 return length;
620
621 length = -ENOMEM;
622 scon = kzalloc(size+1, GFP_KERNEL);
623 if (!scon)
624 return length;
625
626 tcon = kzalloc(size+1, GFP_KERNEL);
627 if (!tcon)
628 goto out;
629
630 length = -EINVAL;
631 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
632 goto out2;
633
634 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
635 if (length < 0)
636 goto out2;
637 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
638 if (length < 0)
639 goto out2;
640
641 length = security_transition_sid(ssid, tsid, tclass, &newsid);
642 if (length < 0)
643 goto out2;
644
645 length = security_sid_to_context(newsid, &newcon, &len);
646 if (length < 0)
647 goto out2;
648
649 if (len > SIMPLE_TRANSACTION_LIMIT) {
650 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
651 "payload max\n", __func__, len);
652 length = -ERANGE;
653 goto out3;
654 }
655
656 memcpy(buf, newcon, len);
657 length = len;
658 out3:
659 kfree(newcon);
660 out2:
661 kfree(tcon);
662 out:
663 kfree(scon);
664 return length;
665 }
666
667 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
668 {
669 char *scon, *tcon;
670 u32 ssid, tsid, newsid;
671 u16 tclass;
672 ssize_t length;
673 char *newcon;
674 u32 len;
675
676 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
677 if (length)
678 return length;
679
680 length = -ENOMEM;
681 scon = kzalloc(size+1, GFP_KERNEL);
682 if (!scon)
683 return length;
684
685 tcon = kzalloc(size+1, GFP_KERNEL);
686 if (!tcon)
687 goto out;
688
689 length = -EINVAL;
690 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
691 goto out2;
692
693 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
694 if (length < 0)
695 goto out2;
696 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
697 if (length < 0)
698 goto out2;
699
700 length = security_change_sid(ssid, tsid, tclass, &newsid);
701 if (length < 0)
702 goto out2;
703
704 length = security_sid_to_context(newsid, &newcon, &len);
705 if (length < 0)
706 goto out2;
707
708 if (len > SIMPLE_TRANSACTION_LIMIT) {
709 length = -ERANGE;
710 goto out3;
711 }
712
713 memcpy(buf, newcon, len);
714 length = len;
715 out3:
716 kfree(newcon);
717 out2:
718 kfree(tcon);
719 out:
720 kfree(scon);
721 return length;
722 }
723
724 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
725 {
726 char *con, *user, *ptr;
727 u32 sid, *sids;
728 ssize_t length;
729 char *newcon;
730 int i, rc;
731 u32 len, nsids;
732
733 length = task_has_security(current, SECURITY__COMPUTE_USER);
734 if (length)
735 return length;
736
737 length = -ENOMEM;
738 con = kzalloc(size+1, GFP_KERNEL);
739 if (!con)
740 return length;
741
742 user = kzalloc(size+1, GFP_KERNEL);
743 if (!user)
744 goto out;
745
746 length = -EINVAL;
747 if (sscanf(buf, "%s %s", con, user) != 2)
748 goto out2;
749
750 length = security_context_to_sid(con, strlen(con)+1, &sid);
751 if (length < 0)
752 goto out2;
753
754 length = security_get_user_sids(sid, user, &sids, &nsids);
755 if (length < 0)
756 goto out2;
757
758 length = sprintf(buf, "%u", nsids) + 1;
759 ptr = buf + length;
760 for (i = 0; i < nsids; i++) {
761 rc = security_sid_to_context(sids[i], &newcon, &len);
762 if (rc) {
763 length = rc;
764 goto out3;
765 }
766 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
767 kfree(newcon);
768 length = -ERANGE;
769 goto out3;
770 }
771 memcpy(ptr, newcon, len);
772 kfree(newcon);
773 ptr += len;
774 length += len;
775 }
776 out3:
777 kfree(sids);
778 out2:
779 kfree(user);
780 out:
781 kfree(con);
782 return length;
783 }
784
785 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
786 {
787 char *scon, *tcon;
788 u32 ssid, tsid, newsid;
789 u16 tclass;
790 ssize_t length;
791 char *newcon;
792 u32 len;
793
794 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
795 if (length)
796 return length;
797
798 length = -ENOMEM;
799 scon = kzalloc(size+1, GFP_KERNEL);
800 if (!scon)
801 return length;
802
803 tcon = kzalloc(size+1, GFP_KERNEL);
804 if (!tcon)
805 goto out;
806
807 length = -EINVAL;
808 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
809 goto out2;
810
811 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
812 if (length < 0)
813 goto out2;
814 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
815 if (length < 0)
816 goto out2;
817
818 length = security_member_sid(ssid, tsid, tclass, &newsid);
819 if (length < 0)
820 goto out2;
821
822 length = security_sid_to_context(newsid, &newcon, &len);
823 if (length < 0)
824 goto out2;
825
826 if (len > SIMPLE_TRANSACTION_LIMIT) {
827 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
828 "payload max\n", __func__, len);
829 length = -ERANGE;
830 goto out3;
831 }
832
833 memcpy(buf, newcon, len);
834 length = len;
835 out3:
836 kfree(newcon);
837 out2:
838 kfree(tcon);
839 out:
840 kfree(scon);
841 return length;
842 }
843
844 static struct inode *sel_make_inode(struct super_block *sb, int mode)
845 {
846 struct inode *ret = new_inode(sb);
847
848 if (ret) {
849 ret->i_mode = mode;
850 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
851 }
852 return ret;
853 }
854
855 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
856 size_t count, loff_t *ppos)
857 {
858 char *page = NULL;
859 ssize_t length;
860 ssize_t ret;
861 int cur_enforcing;
862 struct inode *inode = filep->f_path.dentry->d_inode;
863 unsigned index = inode->i_ino & SEL_INO_MASK;
864 const char *name = filep->f_path.dentry->d_name.name;
865
866 mutex_lock(&sel_mutex);
867
868 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
869 ret = -EINVAL;
870 goto out;
871 }
872
873 if (count > PAGE_SIZE) {
874 ret = -EINVAL;
875 goto out;
876 }
877 page = (char *)get_zeroed_page(GFP_KERNEL);
878 if (!page) {
879 ret = -ENOMEM;
880 goto out;
881 }
882
883 cur_enforcing = security_get_bool_value(index);
884 if (cur_enforcing < 0) {
885 ret = cur_enforcing;
886 goto out;
887 }
888 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
889 bool_pending_values[index]);
890 ret = simple_read_from_buffer(buf, count, ppos, page, length);
891 out:
892 mutex_unlock(&sel_mutex);
893 if (page)
894 free_page((unsigned long)page);
895 return ret;
896 }
897
898 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
899 size_t count, loff_t *ppos)
900 {
901 char *page = NULL;
902 ssize_t length;
903 int new_value;
904 struct inode *inode = filep->f_path.dentry->d_inode;
905 unsigned index = inode->i_ino & SEL_INO_MASK;
906 const char *name = filep->f_path.dentry->d_name.name;
907
908 mutex_lock(&sel_mutex);
909
910 length = task_has_security(current, SECURITY__SETBOOL);
911 if (length)
912 goto out;
913
914 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
915 length = -EINVAL;
916 goto out;
917 }
918
919 if (count >= PAGE_SIZE) {
920 length = -ENOMEM;
921 goto out;
922 }
923
924 if (*ppos != 0) {
925 /* No partial writes. */
926 length = -EINVAL;
927 goto out;
928 }
929 page = (char *)get_zeroed_page(GFP_KERNEL);
930 if (!page) {
931 length = -ENOMEM;
932 goto out;
933 }
934
935 length = -EFAULT;
936 if (copy_from_user(page, buf, count))
937 goto out;
938
939 length = -EINVAL;
940 if (sscanf(page, "%d", &new_value) != 1)
941 goto out;
942
943 if (new_value)
944 new_value = 1;
945
946 bool_pending_values[index] = new_value;
947 length = count;
948
949 out:
950 mutex_unlock(&sel_mutex);
951 if (page)
952 free_page((unsigned long) page);
953 return length;
954 }
955
956 static const struct file_operations sel_bool_ops = {
957 .read = sel_read_bool,
958 .write = sel_write_bool,
959 };
960
961 static ssize_t sel_commit_bools_write(struct file *filep,
962 const char __user *buf,
963 size_t count, loff_t *ppos)
964 {
965 char *page = NULL;
966 ssize_t length;
967 int new_value;
968
969 mutex_lock(&sel_mutex);
970
971 length = task_has_security(current, SECURITY__SETBOOL);
972 if (length)
973 goto out;
974
975 if (count >= PAGE_SIZE) {
976 length = -ENOMEM;
977 goto out;
978 }
979 if (*ppos != 0) {
980 /* No partial writes. */
981 goto out;
982 }
983 page = (char *)get_zeroed_page(GFP_KERNEL);
984 if (!page) {
985 length = -ENOMEM;
986 goto out;
987 }
988
989 length = -EFAULT;
990 if (copy_from_user(page, buf, count))
991 goto out;
992
993 length = -EINVAL;
994 if (sscanf(page, "%d", &new_value) != 1)
995 goto out;
996
997 if (new_value && bool_pending_values)
998 security_set_bools(bool_num, bool_pending_values);
999
1000 length = count;
1001
1002 out:
1003 mutex_unlock(&sel_mutex);
1004 if (page)
1005 free_page((unsigned long) page);
1006 return length;
1007 }
1008
1009 static const struct file_operations sel_commit_bools_ops = {
1010 .write = sel_commit_bools_write,
1011 };
1012
1013 static void sel_remove_entries(struct dentry *de)
1014 {
1015 struct list_head *node;
1016
1017 spin_lock(&dcache_lock);
1018 node = de->d_subdirs.next;
1019 while (node != &de->d_subdirs) {
1020 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1021 list_del_init(node);
1022
1023 if (d->d_inode) {
1024 d = dget_locked(d);
1025 spin_unlock(&dcache_lock);
1026 d_delete(d);
1027 simple_unlink(de->d_inode, d);
1028 dput(d);
1029 spin_lock(&dcache_lock);
1030 }
1031 node = de->d_subdirs.next;
1032 }
1033
1034 spin_unlock(&dcache_lock);
1035 }
1036
1037 #define BOOL_DIR_NAME "booleans"
1038
1039 static int sel_make_bools(void)
1040 {
1041 int i, ret = 0;
1042 ssize_t len;
1043 struct dentry *dentry = NULL;
1044 struct dentry *dir = bool_dir;
1045 struct inode *inode = NULL;
1046 struct inode_security_struct *isec;
1047 char **names = NULL, *page;
1048 int num;
1049 int *values = NULL;
1050 u32 sid;
1051
1052 /* remove any existing files */
1053 kfree(bool_pending_names);
1054 kfree(bool_pending_values);
1055 bool_pending_names = NULL;
1056 bool_pending_values = NULL;
1057
1058 sel_remove_entries(dir);
1059
1060 page = (char *)get_zeroed_page(GFP_KERNEL);
1061 if (!page)
1062 return -ENOMEM;
1063
1064 ret = security_get_bools(&num, &names, &values);
1065 if (ret != 0)
1066 goto out;
1067
1068 for (i = 0; i < num; i++) {
1069 dentry = d_alloc_name(dir, names[i]);
1070 if (!dentry) {
1071 ret = -ENOMEM;
1072 goto err;
1073 }
1074 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1075 if (!inode) {
1076 ret = -ENOMEM;
1077 goto err;
1078 }
1079
1080 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1081 if (len < 0) {
1082 ret = -EINVAL;
1083 goto err;
1084 } else if (len >= PAGE_SIZE) {
1085 ret = -ENAMETOOLONG;
1086 goto err;
1087 }
1088 isec = (struct inode_security_struct *)inode->i_security;
1089 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1090 if (ret)
1091 goto err;
1092 isec->sid = sid;
1093 isec->initialized = 1;
1094 inode->i_fop = &sel_bool_ops;
1095 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1096 d_add(dentry, inode);
1097 }
1098 bool_num = num;
1099 bool_pending_names = names;
1100 bool_pending_values = values;
1101 out:
1102 free_page((unsigned long)page);
1103 return ret;
1104 err:
1105 if (names) {
1106 for (i = 0; i < num; i++)
1107 kfree(names[i]);
1108 kfree(names);
1109 }
1110 kfree(values);
1111 sel_remove_entries(dir);
1112 ret = -ENOMEM;
1113 goto out;
1114 }
1115
1116 #define NULL_FILE_NAME "null"
1117
1118 struct dentry *selinux_null;
1119
1120 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1121 size_t count, loff_t *ppos)
1122 {
1123 char tmpbuf[TMPBUFLEN];
1124 ssize_t length;
1125
1126 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1127 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1128 }
1129
1130 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1131 const char __user *buf,
1132 size_t count, loff_t *ppos)
1133
1134 {
1135 char *page;
1136 ssize_t ret;
1137 int new_value;
1138
1139 if (count >= PAGE_SIZE) {
1140 ret = -ENOMEM;
1141 goto out;
1142 }
1143
1144 if (*ppos != 0) {
1145 /* No partial writes. */
1146 ret = -EINVAL;
1147 goto out;
1148 }
1149
1150 page = (char *)get_zeroed_page(GFP_KERNEL);
1151 if (!page) {
1152 ret = -ENOMEM;
1153 goto out;
1154 }
1155
1156 if (copy_from_user(page, buf, count)) {
1157 ret = -EFAULT;
1158 goto out_free;
1159 }
1160
1161 if (sscanf(page, "%u", &new_value) != 1) {
1162 ret = -EINVAL;
1163 goto out;
1164 }
1165
1166 if (new_value != avc_cache_threshold) {
1167 ret = task_has_security(current, SECURITY__SETSECPARAM);
1168 if (ret)
1169 goto out_free;
1170 avc_cache_threshold = new_value;
1171 }
1172 ret = count;
1173 out_free:
1174 free_page((unsigned long)page);
1175 out:
1176 return ret;
1177 }
1178
1179 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1180 size_t count, loff_t *ppos)
1181 {
1182 char *page;
1183 ssize_t ret = 0;
1184
1185 page = (char *)__get_free_page(GFP_KERNEL);
1186 if (!page) {
1187 ret = -ENOMEM;
1188 goto out;
1189 }
1190 ret = avc_get_hash_stats(page);
1191 if (ret >= 0)
1192 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1193 free_page((unsigned long)page);
1194 out:
1195 return ret;
1196 }
1197
1198 static const struct file_operations sel_avc_cache_threshold_ops = {
1199 .read = sel_read_avc_cache_threshold,
1200 .write = sel_write_avc_cache_threshold,
1201 };
1202
1203 static const struct file_operations sel_avc_hash_stats_ops = {
1204 .read = sel_read_avc_hash_stats,
1205 };
1206
1207 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1208 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1209 {
1210 int cpu;
1211
1212 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1213 if (!cpu_possible(cpu))
1214 continue;
1215 *idx = cpu + 1;
1216 return &per_cpu(avc_cache_stats, cpu);
1217 }
1218 return NULL;
1219 }
1220
1221 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1222 {
1223 loff_t n = *pos - 1;
1224
1225 if (*pos == 0)
1226 return SEQ_START_TOKEN;
1227
1228 return sel_avc_get_stat_idx(&n);
1229 }
1230
1231 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1232 {
1233 return sel_avc_get_stat_idx(pos);
1234 }
1235
1236 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1237 {
1238 struct avc_cache_stats *st = v;
1239
1240 if (v == SEQ_START_TOKEN)
1241 seq_printf(seq, "lookups hits misses allocations reclaims "
1242 "frees\n");
1243 else
1244 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1245 st->hits, st->misses, st->allocations,
1246 st->reclaims, st->frees);
1247 return 0;
1248 }
1249
1250 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1251 { }
1252
1253 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1254 .start = sel_avc_stats_seq_start,
1255 .next = sel_avc_stats_seq_next,
1256 .show = sel_avc_stats_seq_show,
1257 .stop = sel_avc_stats_seq_stop,
1258 };
1259
1260 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1261 {
1262 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1263 }
1264
1265 static const struct file_operations sel_avc_cache_stats_ops = {
1266 .open = sel_open_avc_cache_stats,
1267 .read = seq_read,
1268 .llseek = seq_lseek,
1269 .release = seq_release,
1270 };
1271 #endif
1272
1273 static int sel_make_avc_files(struct dentry *dir)
1274 {
1275 int i, ret = 0;
1276 static struct tree_descr files[] = {
1277 { "cache_threshold",
1278 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1279 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1280 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1281 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1282 #endif
1283 };
1284
1285 for (i = 0; i < ARRAY_SIZE(files); i++) {
1286 struct inode *inode;
1287 struct dentry *dentry;
1288
1289 dentry = d_alloc_name(dir, files[i].name);
1290 if (!dentry) {
1291 ret = -ENOMEM;
1292 goto out;
1293 }
1294
1295 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1296 if (!inode) {
1297 ret = -ENOMEM;
1298 goto out;
1299 }
1300 inode->i_fop = files[i].ops;
1301 inode->i_ino = ++sel_last_ino;
1302 d_add(dentry, inode);
1303 }
1304 out:
1305 return ret;
1306 }
1307
1308 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1309 size_t count, loff_t *ppos)
1310 {
1311 struct inode *inode;
1312 char *con;
1313 u32 sid, len;
1314 ssize_t ret;
1315
1316 inode = file->f_path.dentry->d_inode;
1317 sid = inode->i_ino&SEL_INO_MASK;
1318 ret = security_sid_to_context(sid, &con, &len);
1319 if (ret < 0)
1320 return ret;
1321
1322 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1323 kfree(con);
1324 return ret;
1325 }
1326
1327 static const struct file_operations sel_initcon_ops = {
1328 .read = sel_read_initcon,
1329 };
1330
1331 static int sel_make_initcon_files(struct dentry *dir)
1332 {
1333 int i, ret = 0;
1334
1335 for (i = 1; i <= SECINITSID_NUM; i++) {
1336 struct inode *inode;
1337 struct dentry *dentry;
1338 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1339 if (!dentry) {
1340 ret = -ENOMEM;
1341 goto out;
1342 }
1343
1344 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1345 if (!inode) {
1346 ret = -ENOMEM;
1347 goto out;
1348 }
1349 inode->i_fop = &sel_initcon_ops;
1350 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1351 d_add(dentry, inode);
1352 }
1353 out:
1354 return ret;
1355 }
1356
1357 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1358 {
1359 return a / b - (a % b < 0);
1360 }
1361
1362 static inline unsigned long sel_class_to_ino(u16 class)
1363 {
1364 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1365 }
1366
1367 static inline u16 sel_ino_to_class(unsigned long ino)
1368 {
1369 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1370 }
1371
1372 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1373 {
1374 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1375 }
1376
1377 static inline u32 sel_ino_to_perm(unsigned long ino)
1378 {
1379 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1380 }
1381
1382 static ssize_t sel_read_class(struct file *file, char __user *buf,
1383 size_t count, loff_t *ppos)
1384 {
1385 ssize_t rc, len;
1386 char *page;
1387 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1388
1389 page = (char *)__get_free_page(GFP_KERNEL);
1390 if (!page) {
1391 rc = -ENOMEM;
1392 goto out;
1393 }
1394
1395 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1396 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1397 free_page((unsigned long)page);
1398 out:
1399 return rc;
1400 }
1401
1402 static const struct file_operations sel_class_ops = {
1403 .read = sel_read_class,
1404 };
1405
1406 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1407 size_t count, loff_t *ppos)
1408 {
1409 ssize_t rc, len;
1410 char *page;
1411 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1412
1413 page = (char *)__get_free_page(GFP_KERNEL);
1414 if (!page) {
1415 rc = -ENOMEM;
1416 goto out;
1417 }
1418
1419 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1420 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1421 free_page((unsigned long)page);
1422 out:
1423 return rc;
1424 }
1425
1426 static const struct file_operations sel_perm_ops = {
1427 .read = sel_read_perm,
1428 };
1429
1430 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1431 size_t count, loff_t *ppos)
1432 {
1433 int value;
1434 char tmpbuf[TMPBUFLEN];
1435 ssize_t length;
1436 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1437
1438 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1439 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1440
1441 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1442 }
1443
1444 static const struct file_operations sel_policycap_ops = {
1445 .read = sel_read_policycap,
1446 };
1447
1448 static int sel_make_perm_files(char *objclass, int classvalue,
1449 struct dentry *dir)
1450 {
1451 int i, rc = 0, nperms;
1452 char **perms;
1453
1454 rc = security_get_permissions(objclass, &perms, &nperms);
1455 if (rc)
1456 goto out;
1457
1458 for (i = 0; i < nperms; i++) {
1459 struct inode *inode;
1460 struct dentry *dentry;
1461
1462 dentry = d_alloc_name(dir, perms[i]);
1463 if (!dentry) {
1464 rc = -ENOMEM;
1465 goto out1;
1466 }
1467
1468 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1469 if (!inode) {
1470 rc = -ENOMEM;
1471 goto out1;
1472 }
1473 inode->i_fop = &sel_perm_ops;
1474 /* i+1 since perm values are 1-indexed */
1475 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1476 d_add(dentry, inode);
1477 }
1478
1479 out1:
1480 for (i = 0; i < nperms; i++)
1481 kfree(perms[i]);
1482 kfree(perms);
1483 out:
1484 return rc;
1485 }
1486
1487 static int sel_make_class_dir_entries(char *classname, int index,
1488 struct dentry *dir)
1489 {
1490 struct dentry *dentry = NULL;
1491 struct inode *inode = NULL;
1492 int rc;
1493
1494 dentry = d_alloc_name(dir, "index");
1495 if (!dentry) {
1496 rc = -ENOMEM;
1497 goto out;
1498 }
1499
1500 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1501 if (!inode) {
1502 rc = -ENOMEM;
1503 goto out;
1504 }
1505
1506 inode->i_fop = &sel_class_ops;
1507 inode->i_ino = sel_class_to_ino(index);
1508 d_add(dentry, inode);
1509
1510 dentry = d_alloc_name(dir, "perms");
1511 if (!dentry) {
1512 rc = -ENOMEM;
1513 goto out;
1514 }
1515
1516 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1517 if (rc)
1518 goto out;
1519
1520 rc = sel_make_perm_files(classname, index, dentry);
1521
1522 out:
1523 return rc;
1524 }
1525
1526 static void sel_remove_classes(void)
1527 {
1528 struct list_head *class_node;
1529
1530 list_for_each(class_node, &class_dir->d_subdirs) {
1531 struct dentry *class_subdir = list_entry(class_node,
1532 struct dentry, d_u.d_child);
1533 struct list_head *class_subdir_node;
1534
1535 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1536 struct dentry *d = list_entry(class_subdir_node,
1537 struct dentry, d_u.d_child);
1538
1539 if (d->d_inode)
1540 if (d->d_inode->i_mode & S_IFDIR)
1541 sel_remove_entries(d);
1542 }
1543
1544 sel_remove_entries(class_subdir);
1545 }
1546
1547 sel_remove_entries(class_dir);
1548 }
1549
1550 static int sel_make_classes(void)
1551 {
1552 int rc = 0, nclasses, i;
1553 char **classes;
1554
1555 /* delete any existing entries */
1556 sel_remove_classes();
1557
1558 rc = security_get_classes(&classes, &nclasses);
1559 if (rc < 0)
1560 goto out;
1561
1562 /* +2 since classes are 1-indexed */
1563 last_class_ino = sel_class_to_ino(nclasses+2);
1564
1565 for (i = 0; i < nclasses; i++) {
1566 struct dentry *class_name_dir;
1567
1568 class_name_dir = d_alloc_name(class_dir, classes[i]);
1569 if (!class_name_dir) {
1570 rc = -ENOMEM;
1571 goto out1;
1572 }
1573
1574 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1575 &last_class_ino);
1576 if (rc)
1577 goto out1;
1578
1579 /* i+1 since class values are 1-indexed */
1580 rc = sel_make_class_dir_entries(classes[i], i+1,
1581 class_name_dir);
1582 if (rc)
1583 goto out1;
1584 }
1585
1586 out1:
1587 for (i = 0; i < nclasses; i++)
1588 kfree(classes[i]);
1589 kfree(classes);
1590 out:
1591 return rc;
1592 }
1593
1594 static int sel_make_policycap(void)
1595 {
1596 unsigned int iter;
1597 struct dentry *dentry = NULL;
1598 struct inode *inode = NULL;
1599
1600 sel_remove_entries(policycap_dir);
1601
1602 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1603 if (iter < ARRAY_SIZE(policycap_names))
1604 dentry = d_alloc_name(policycap_dir,
1605 policycap_names[iter]);
1606 else
1607 dentry = d_alloc_name(policycap_dir, "unknown");
1608
1609 if (dentry == NULL)
1610 return -ENOMEM;
1611
1612 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1613 if (inode == NULL)
1614 return -ENOMEM;
1615
1616 inode->i_fop = &sel_policycap_ops;
1617 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1618 d_add(dentry, inode);
1619 }
1620
1621 return 0;
1622 }
1623
1624 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1625 unsigned long *ino)
1626 {
1627 int ret = 0;
1628 struct inode *inode;
1629
1630 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1631 if (!inode) {
1632 ret = -ENOMEM;
1633 goto out;
1634 }
1635 inode->i_op = &simple_dir_inode_operations;
1636 inode->i_fop = &simple_dir_operations;
1637 inode->i_ino = ++(*ino);
1638 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1639 inc_nlink(inode);
1640 d_add(dentry, inode);
1641 /* bump link count on parent directory, too */
1642 inc_nlink(dir);
1643 out:
1644 return ret;
1645 }
1646
1647 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1648 {
1649 int ret;
1650 struct dentry *dentry;
1651 struct inode *inode, *root_inode;
1652 struct inode_security_struct *isec;
1653
1654 static struct tree_descr selinux_files[] = {
1655 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1656 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1657 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1658 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1659 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1660 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1661 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1662 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1663 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1664 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1665 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1666 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1667 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1668 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1669 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1670 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1671 /* last one */ {""}
1672 };
1673 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1674 if (ret)
1675 goto err;
1676
1677 root_inode = sb->s_root->d_inode;
1678
1679 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1680 if (!dentry) {
1681 ret = -ENOMEM;
1682 goto err;
1683 }
1684
1685 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1686 if (ret)
1687 goto err;
1688
1689 bool_dir = dentry;
1690
1691 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1692 if (!dentry) {
1693 ret = -ENOMEM;
1694 goto err;
1695 }
1696
1697 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1698 if (!inode) {
1699 ret = -ENOMEM;
1700 goto err;
1701 }
1702 inode->i_ino = ++sel_last_ino;
1703 isec = (struct inode_security_struct *)inode->i_security;
1704 isec->sid = SECINITSID_DEVNULL;
1705 isec->sclass = SECCLASS_CHR_FILE;
1706 isec->initialized = 1;
1707
1708 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1709 d_add(dentry, inode);
1710 selinux_null = dentry;
1711
1712 dentry = d_alloc_name(sb->s_root, "avc");
1713 if (!dentry) {
1714 ret = -ENOMEM;
1715 goto err;
1716 }
1717
1718 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1719 if (ret)
1720 goto err;
1721
1722 ret = sel_make_avc_files(dentry);
1723 if (ret)
1724 goto err;
1725
1726 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1727 if (!dentry) {
1728 ret = -ENOMEM;
1729 goto err;
1730 }
1731
1732 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1733 if (ret)
1734 goto err;
1735
1736 ret = sel_make_initcon_files(dentry);
1737 if (ret)
1738 goto err;
1739
1740 dentry = d_alloc_name(sb->s_root, "class");
1741 if (!dentry) {
1742 ret = -ENOMEM;
1743 goto err;
1744 }
1745
1746 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1747 if (ret)
1748 goto err;
1749
1750 class_dir = dentry;
1751
1752 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1753 if (!dentry) {
1754 ret = -ENOMEM;
1755 goto err;
1756 }
1757
1758 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1759 if (ret)
1760 goto err;
1761
1762 policycap_dir = dentry;
1763
1764 out:
1765 return ret;
1766 err:
1767 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1768 __func__);
1769 goto out;
1770 }
1771
1772 static int sel_get_sb(struct file_system_type *fs_type,
1773 int flags, const char *dev_name, void *data,
1774 struct vfsmount *mnt)
1775 {
1776 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1777 }
1778
1779 static struct file_system_type sel_fs_type = {
1780 .name = "selinuxfs",
1781 .get_sb = sel_get_sb,
1782 .kill_sb = kill_litter_super,
1783 };
1784
1785 struct vfsmount *selinuxfs_mount;
1786
1787 static int __init init_sel_fs(void)
1788 {
1789 int err;
1790
1791 if (!selinux_enabled)
1792 return 0;
1793 err = register_filesystem(&sel_fs_type);
1794 if (!err) {
1795 selinuxfs_mount = kern_mount(&sel_fs_type);
1796 if (IS_ERR(selinuxfs_mount)) {
1797 printk(KERN_ERR "selinuxfs: could not mount!\n");
1798 err = PTR_ERR(selinuxfs_mount);
1799 selinuxfs_mount = NULL;
1800 }
1801 }
1802 return err;
1803 }
1804
1805 __initcall(init_sel_fs);
1806
1807 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1808 void exit_sel_fs(void)
1809 {
1810 unregister_filesystem(&sel_fs_type);
1811 }
1812 #endif
Support for the Chinese Samsung S3C2440 based development boards