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powerpc: fix for long standing bug noticed by gcc 4.4.0
[linux-2.6/mini2440.git] / security / selinux / selinuxfs.c
blob2d5136ec3d5451c945f89e59b2f9ea4433bfa6a4
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 static int __init checkreqprot_setup(char *str)
51 {
52 unsigned long checkreqprot;
53 if (!strict_strtoul(str, 0, &checkreqprot))
54 selinux_checkreqprot = checkreqprot ? 1 : 0;
55 return 1;
56 }
57 __setup("checkreqprot=", checkreqprot_setup);
58
59 static DEFINE_MUTEX(sel_mutex);
60
61 /* global data for booleans */
62 static struct dentry *bool_dir;
63 static int bool_num;
64 static char **bool_pending_names;
65 static int *bool_pending_values;
66
67 /* global data for classes */
68 static struct dentry *class_dir;
69 static unsigned long last_class_ino;
70
71 /* global data for policy capabilities */
72 static struct dentry *policycap_dir;
73
74 extern void selnl_notify_setenforce(int val);
75
76 /* Check whether a task is allowed to use a security operation. */
77 static int task_has_security(struct task_struct *tsk,
78 u32 perms)
79 {
80 const struct task_security_struct *tsec;
81 u32 sid = 0;
82
83 rcu_read_lock();
84 tsec = __task_cred(tsk)->security;
85 if (tsec)
86 sid = tsec->sid;
87 rcu_read_unlock();
88 if (!tsec)
89 return -EACCES;
90
91 return avc_has_perm(sid, SECINITSID_SECURITY,
92 SECCLASS_SECURITY, perms, NULL);
93 }
94
95 enum sel_inos {
96 SEL_ROOT_INO = 2,
97 SEL_LOAD, /* load policy */
98 SEL_ENFORCE, /* get or set enforcing status */
99 SEL_CONTEXT, /* validate context */
100 SEL_ACCESS, /* compute access decision */
101 SEL_CREATE, /* compute create labeling decision */
102 SEL_RELABEL, /* compute relabeling decision */
103 SEL_USER, /* compute reachable user contexts */
104 SEL_POLICYVERS, /* return policy version for this kernel */
105 SEL_COMMIT_BOOLS, /* commit new boolean values */
106 SEL_MLS, /* return if MLS policy is enabled */
107 SEL_DISABLE, /* disable SELinux until next reboot */
108 SEL_MEMBER, /* compute polyinstantiation membership decision */
109 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
110 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
111 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
112 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
113 SEL_INO_NEXT, /* The next inode number to use */
114 };
115
116 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
117
118 #define SEL_INITCON_INO_OFFSET 0x01000000
119 #define SEL_BOOL_INO_OFFSET 0x02000000
120 #define SEL_CLASS_INO_OFFSET 0x04000000
121 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
122 #define SEL_INO_MASK 0x00ffffff
123
124 #define TMPBUFLEN 12
125 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
126 size_t count, loff_t *ppos)
127 {
128 char tmpbuf[TMPBUFLEN];
129 ssize_t length;
130
131 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
132 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
133 }
134
135 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
136 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
137 size_t count, loff_t *ppos)
138
139 {
140 char *page;
141 ssize_t length;
142 int new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146 if (*ppos != 0) {
147 /* No partial writes. */
148 return -EINVAL;
149 }
150 page = (char *)get_zeroed_page(GFP_KERNEL);
151 if (!page)
152 return -ENOMEM;
153 length = -EFAULT;
154 if (copy_from_user(page, buf, count))
155 goto out;
156
157 length = -EINVAL;
158 if (sscanf(page, "%d", &new_value) != 1)
159 goto out;
160
161 if (new_value != selinux_enforcing) {
162 length = task_has_security(current, SECURITY__SETENFORCE);
163 if (length)
164 goto out;
165 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
166 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
167 new_value, selinux_enforcing,
168 audit_get_loginuid(current),
169 audit_get_sessionid(current));
170 selinux_enforcing = new_value;
171 if (selinux_enforcing)
172 avc_ss_reset(0);
173 selnl_notify_setenforce(selinux_enforcing);
174 }
175 length = count;
176 out:
177 free_page((unsigned long) page);
178 return length;
179 }
180 #else
181 #define sel_write_enforce NULL
182 #endif
183
184 static const struct file_operations sel_enforce_ops = {
185 .read = sel_read_enforce,
186 .write = sel_write_enforce,
187 };
188
189 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
190 size_t count, loff_t *ppos)
191 {
192 char tmpbuf[TMPBUFLEN];
193 ssize_t length;
194 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
195 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
196 security_get_reject_unknown() : !security_get_allow_unknown();
197
198 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
199 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
200 }
201
202 static const struct file_operations sel_handle_unknown_ops = {
203 .read = sel_read_handle_unknown,
204 };
205
206 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
207 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
208 size_t count, loff_t *ppos)
209
210 {
211 char *page;
212 ssize_t length;
213 int new_value;
214 extern int selinux_disable(void);
215
216 if (count >= PAGE_SIZE)
217 return -ENOMEM;
218 if (*ppos != 0) {
219 /* No partial writes. */
220 return -EINVAL;
221 }
222 page = (char *)get_zeroed_page(GFP_KERNEL);
223 if (!page)
224 return -ENOMEM;
225 length = -EFAULT;
226 if (copy_from_user(page, buf, count))
227 goto out;
228
229 length = -EINVAL;
230 if (sscanf(page, "%d", &new_value) != 1)
231 goto out;
232
233 if (new_value) {
234 length = selinux_disable();
235 if (length < 0)
236 goto out;
237 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
238 "selinux=0 auid=%u ses=%u",
239 audit_get_loginuid(current),
240 audit_get_sessionid(current));
241 }
242
243 length = count;
244 out:
245 free_page((unsigned long) page);
246 return length;
247 }
248 #else
249 #define sel_write_disable NULL
250 #endif
251
252 static const struct file_operations sel_disable_ops = {
253 .write = sel_write_disable,
254 };
255
256 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
257 size_t count, loff_t *ppos)
258 {
259 char tmpbuf[TMPBUFLEN];
260 ssize_t length;
261
262 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
263 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
264 }
265
266 static const struct file_operations sel_policyvers_ops = {
267 .read = sel_read_policyvers,
268 };
269
270 /* declaration for sel_write_load */
271 static int sel_make_bools(void);
272 static int sel_make_classes(void);
273 static int sel_make_policycap(void);
274
275 /* declaration for sel_make_class_dirs */
276 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
277 unsigned long *ino);
278
279 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
280 size_t count, loff_t *ppos)
281 {
282 char tmpbuf[TMPBUFLEN];
283 ssize_t length;
284
285 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
286 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
287 }
288
289 static const struct file_operations sel_mls_ops = {
290 .read = sel_read_mls,
291 };
292
293 static ssize_t sel_write_load(struct file *file, const char __user *buf,
294 size_t count, loff_t *ppos)
295
296 {
297 int ret;
298 ssize_t length;
299 void *data = NULL;
300
301 mutex_lock(&sel_mutex);
302
303 length = task_has_security(current, SECURITY__LOAD_POLICY);
304 if (length)
305 goto out;
306
307 if (*ppos != 0) {
308 /* No partial writes. */
309 length = -EINVAL;
310 goto out;
311 }
312
313 if ((count > 64 * 1024 * 1024)
314 || (data = vmalloc(count)) == NULL) {
315 length = -ENOMEM;
316 goto out;
317 }
318
319 length = -EFAULT;
320 if (copy_from_user(data, buf, count) != 0)
321 goto out;
322
323 length = security_load_policy(data, count);
324 if (length)
325 goto out;
326
327 ret = sel_make_bools();
328 if (ret) {
329 length = ret;
330 goto out1;
331 }
332
333 ret = sel_make_classes();
334 if (ret) {
335 length = ret;
336 goto out1;
337 }
338
339 ret = sel_make_policycap();
340 if (ret)
341 length = ret;
342 else
343 length = count;
344
345 out1:
346 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
347 "policy loaded auid=%u ses=%u",
348 audit_get_loginuid(current),
349 audit_get_sessionid(current));
350 out:
351 mutex_unlock(&sel_mutex);
352 vfree(data);
353 return length;
354 }
355
356 static const struct file_operations sel_load_ops = {
357 .write = sel_write_load,
358 };
359
360 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
361 {
362 char *canon;
363 u32 sid, len;
364 ssize_t length;
365
366 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
367 if (length)
368 return length;
369
370 length = security_context_to_sid(buf, size, &sid);
371 if (length < 0)
372 return length;
373
374 length = security_sid_to_context(sid, &canon, &len);
375 if (length < 0)
376 return length;
377
378 if (len > SIMPLE_TRANSACTION_LIMIT) {
379 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
380 "payload max\n", __func__, len);
381 length = -ERANGE;
382 goto out;
383 }
384
385 memcpy(buf, canon, len);
386 length = len;
387 out:
388 kfree(canon);
389 return length;
390 }
391
392 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
393 size_t count, loff_t *ppos)
394 {
395 char tmpbuf[TMPBUFLEN];
396 ssize_t length;
397
398 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
399 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
400 }
401
402 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
403 size_t count, loff_t *ppos)
404 {
405 char *page;
406 ssize_t length;
407 unsigned int new_value;
408
409 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
410 if (length)
411 return length;
412
413 if (count >= PAGE_SIZE)
414 return -ENOMEM;
415 if (*ppos != 0) {
416 /* No partial writes. */
417 return -EINVAL;
418 }
419 page = (char *)get_zeroed_page(GFP_KERNEL);
420 if (!page)
421 return -ENOMEM;
422 length = -EFAULT;
423 if (copy_from_user(page, buf, count))
424 goto out;
425
426 length = -EINVAL;
427 if (sscanf(page, "%u", &new_value) != 1)
428 goto out;
429
430 selinux_checkreqprot = new_value ? 1 : 0;
431 length = count;
432 out:
433 free_page((unsigned long) page);
434 return length;
435 }
436 static const struct file_operations sel_checkreqprot_ops = {
437 .read = sel_read_checkreqprot,
438 .write = sel_write_checkreqprot,
439 };
440
441 /*
442 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
443 */
444 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
445 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
446 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
447 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
448 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
449
450 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
451 [SEL_ACCESS] = sel_write_access,
452 [SEL_CREATE] = sel_write_create,
453 [SEL_RELABEL] = sel_write_relabel,
454 [SEL_USER] = sel_write_user,
455 [SEL_MEMBER] = sel_write_member,
456 [SEL_CONTEXT] = sel_write_context,
457 };
458
459 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
460 {
461 ino_t ino = file->f_path.dentry->d_inode->i_ino;
462 char *data;
463 ssize_t rv;
464
465 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
466 return -EINVAL;
467
468 data = simple_transaction_get(file, buf, size);
469 if (IS_ERR(data))
470 return PTR_ERR(data);
471
472 rv = write_op[ino](file, data, size);
473 if (rv > 0) {
474 simple_transaction_set(file, rv);
475 rv = size;
476 }
477 return rv;
478 }
479
480 static const struct file_operations transaction_ops = {
481 .write = selinux_transaction_write,
482 .read = simple_transaction_read,
483 .release = simple_transaction_release,
484 };
485
486 /*
487 * payload - write methods
488 * If the method has a response, the response should be put in buf,
489 * and the length returned. Otherwise return 0 or and -error.
490 */
491
492 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
493 {
494 char *scon, *tcon;
495 u32 ssid, tsid;
496 u16 tclass;
497 u32 req;
498 struct av_decision avd;
499 ssize_t length;
500
501 length = task_has_security(current, SECURITY__COMPUTE_AV);
502 if (length)
503 return length;
504
505 length = -ENOMEM;
506 scon = kzalloc(size+1, GFP_KERNEL);
507 if (!scon)
508 return length;
509
510 tcon = kzalloc(size+1, GFP_KERNEL);
511 if (!tcon)
512 goto out;
513
514 length = -EINVAL;
515 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
516 goto out2;
517
518 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
519 if (length < 0)
520 goto out2;
521 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
522 if (length < 0)
523 goto out2;
524
525 length = security_compute_av(ssid, tsid, tclass, req, &avd);
526 if (length < 0)
527 goto out2;
528
529 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
530 "%x %x %x %x %u",
531 avd.allowed, 0xffffffff,
532 avd.auditallow, avd.auditdeny,
533 avd.seqno);
534 out2:
535 kfree(tcon);
536 out:
537 kfree(scon);
538 return length;
539 }
540
541 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
542 {
543 char *scon, *tcon;
544 u32 ssid, tsid, newsid;
545 u16 tclass;
546 ssize_t length;
547 char *newcon;
548 u32 len;
549
550 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
551 if (length)
552 return length;
553
554 length = -ENOMEM;
555 scon = kzalloc(size+1, GFP_KERNEL);
556 if (!scon)
557 return length;
558
559 tcon = kzalloc(size+1, GFP_KERNEL);
560 if (!tcon)
561 goto out;
562
563 length = -EINVAL;
564 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
565 goto out2;
566
567 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
568 if (length < 0)
569 goto out2;
570 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
571 if (length < 0)
572 goto out2;
573
574 length = security_transition_sid(ssid, tsid, tclass, &newsid);
575 if (length < 0)
576 goto out2;
577
578 length = security_sid_to_context(newsid, &newcon, &len);
579 if (length < 0)
580 goto out2;
581
582 if (len > SIMPLE_TRANSACTION_LIMIT) {
583 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
584 "payload max\n", __func__, len);
585 length = -ERANGE;
586 goto out3;
587 }
588
589 memcpy(buf, newcon, len);
590 length = len;
591 out3:
592 kfree(newcon);
593 out2:
594 kfree(tcon);
595 out:
596 kfree(scon);
597 return length;
598 }
599
600 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
601 {
602 char *scon, *tcon;
603 u32 ssid, tsid, newsid;
604 u16 tclass;
605 ssize_t length;
606 char *newcon;
607 u32 len;
608
609 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
610 if (length)
611 return length;
612
613 length = -ENOMEM;
614 scon = kzalloc(size+1, GFP_KERNEL);
615 if (!scon)
616 return length;
617
618 tcon = kzalloc(size+1, GFP_KERNEL);
619 if (!tcon)
620 goto out;
621
622 length = -EINVAL;
623 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
624 goto out2;
625
626 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
627 if (length < 0)
628 goto out2;
629 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
630 if (length < 0)
631 goto out2;
632
633 length = security_change_sid(ssid, tsid, tclass, &newsid);
634 if (length < 0)
635 goto out2;
636
637 length = security_sid_to_context(newsid, &newcon, &len);
638 if (length < 0)
639 goto out2;
640
641 if (len > SIMPLE_TRANSACTION_LIMIT) {
642 length = -ERANGE;
643 goto out3;
644 }
645
646 memcpy(buf, newcon, len);
647 length = len;
648 out3:
649 kfree(newcon);
650 out2:
651 kfree(tcon);
652 out:
653 kfree(scon);
654 return length;
655 }
656
657 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
658 {
659 char *con, *user, *ptr;
660 u32 sid, *sids;
661 ssize_t length;
662 char *newcon;
663 int i, rc;
664 u32 len, nsids;
665
666 length = task_has_security(current, SECURITY__COMPUTE_USER);
667 if (length)
668 return length;
669
670 length = -ENOMEM;
671 con = kzalloc(size+1, GFP_KERNEL);
672 if (!con)
673 return length;
674
675 user = kzalloc(size+1, GFP_KERNEL);
676 if (!user)
677 goto out;
678
679 length = -EINVAL;
680 if (sscanf(buf, "%s %s", con, user) != 2)
681 goto out2;
682
683 length = security_context_to_sid(con, strlen(con)+1, &sid);
684 if (length < 0)
685 goto out2;
686
687 length = security_get_user_sids(sid, user, &sids, &nsids);
688 if (length < 0)
689 goto out2;
690
691 length = sprintf(buf, "%u", nsids) + 1;
692 ptr = buf + length;
693 for (i = 0; i < nsids; i++) {
694 rc = security_sid_to_context(sids[i], &newcon, &len);
695 if (rc) {
696 length = rc;
697 goto out3;
698 }
699 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
700 kfree(newcon);
701 length = -ERANGE;
702 goto out3;
703 }
704 memcpy(ptr, newcon, len);
705 kfree(newcon);
706 ptr += len;
707 length += len;
708 }
709 out3:
710 kfree(sids);
711 out2:
712 kfree(user);
713 out:
714 kfree(con);
715 return length;
716 }
717
718 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
719 {
720 char *scon, *tcon;
721 u32 ssid, tsid, newsid;
722 u16 tclass;
723 ssize_t length;
724 char *newcon;
725 u32 len;
726
727 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
728 if (length)
729 return length;
730
731 length = -ENOMEM;
732 scon = kzalloc(size+1, GFP_KERNEL);
733 if (!scon)
734 return length;
735
736 tcon = kzalloc(size+1, GFP_KERNEL);
737 if (!tcon)
738 goto out;
739
740 length = -EINVAL;
741 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
742 goto out2;
743
744 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
745 if (length < 0)
746 goto out2;
747 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
748 if (length < 0)
749 goto out2;
750
751 length = security_member_sid(ssid, tsid, tclass, &newsid);
752 if (length < 0)
753 goto out2;
754
755 length = security_sid_to_context(newsid, &newcon, &len);
756 if (length < 0)
757 goto out2;
758
759 if (len > SIMPLE_TRANSACTION_LIMIT) {
760 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
761 "payload max\n", __func__, len);
762 length = -ERANGE;
763 goto out3;
764 }
765
766 memcpy(buf, newcon, len);
767 length = len;
768 out3:
769 kfree(newcon);
770 out2:
771 kfree(tcon);
772 out:
773 kfree(scon);
774 return length;
775 }
776
777 static struct inode *sel_make_inode(struct super_block *sb, int mode)
778 {
779 struct inode *ret = new_inode(sb);
780
781 if (ret) {
782 ret->i_mode = mode;
783 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
784 }
785 return ret;
786 }
787
788 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
789 size_t count, loff_t *ppos)
790 {
791 char *page = NULL;
792 ssize_t length;
793 ssize_t ret;
794 int cur_enforcing;
795 struct inode *inode = filep->f_path.dentry->d_inode;
796 unsigned index = inode->i_ino & SEL_INO_MASK;
797 const char *name = filep->f_path.dentry->d_name.name;
798
799 mutex_lock(&sel_mutex);
800
801 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
802 ret = -EINVAL;
803 goto out;
804 }
805
806 if (count > PAGE_SIZE) {
807 ret = -EINVAL;
808 goto out;
809 }
810 page = (char *)get_zeroed_page(GFP_KERNEL);
811 if (!page) {
812 ret = -ENOMEM;
813 goto out;
814 }
815
816 cur_enforcing = security_get_bool_value(index);
817 if (cur_enforcing < 0) {
818 ret = cur_enforcing;
819 goto out;
820 }
821 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
822 bool_pending_values[index]);
823 ret = simple_read_from_buffer(buf, count, ppos, page, length);
824 out:
825 mutex_unlock(&sel_mutex);
826 if (page)
827 free_page((unsigned long)page);
828 return ret;
829 }
830
831 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
832 size_t count, loff_t *ppos)
833 {
834 char *page = NULL;
835 ssize_t length;
836 int new_value;
837 struct inode *inode = filep->f_path.dentry->d_inode;
838 unsigned index = inode->i_ino & SEL_INO_MASK;
839 const char *name = filep->f_path.dentry->d_name.name;
840
841 mutex_lock(&sel_mutex);
842
843 length = task_has_security(current, SECURITY__SETBOOL);
844 if (length)
845 goto out;
846
847 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
848 length = -EINVAL;
849 goto out;
850 }
851
852 if (count >= PAGE_SIZE) {
853 length = -ENOMEM;
854 goto out;
855 }
856
857 if (*ppos != 0) {
858 /* No partial writes. */
859 length = -EINVAL;
860 goto out;
861 }
862 page = (char *)get_zeroed_page(GFP_KERNEL);
863 if (!page) {
864 length = -ENOMEM;
865 goto out;
866 }
867
868 length = -EFAULT;
869 if (copy_from_user(page, buf, count))
870 goto out;
871
872 length = -EINVAL;
873 if (sscanf(page, "%d", &new_value) != 1)
874 goto out;
875
876 if (new_value)
877 new_value = 1;
878
879 bool_pending_values[index] = new_value;
880 length = count;
881
882 out:
883 mutex_unlock(&sel_mutex);
884 if (page)
885 free_page((unsigned long) page);
886 return length;
887 }
888
889 static const struct file_operations sel_bool_ops = {
890 .read = sel_read_bool,
891 .write = sel_write_bool,
892 };
893
894 static ssize_t sel_commit_bools_write(struct file *filep,
895 const char __user *buf,
896 size_t count, loff_t *ppos)
897 {
898 char *page = NULL;
899 ssize_t length;
900 int new_value;
901
902 mutex_lock(&sel_mutex);
903
904 length = task_has_security(current, SECURITY__SETBOOL);
905 if (length)
906 goto out;
907
908 if (count >= PAGE_SIZE) {
909 length = -ENOMEM;
910 goto out;
911 }
912 if (*ppos != 0) {
913 /* No partial writes. */
914 goto out;
915 }
916 page = (char *)get_zeroed_page(GFP_KERNEL);
917 if (!page) {
918 length = -ENOMEM;
919 goto out;
920 }
921
922 length = -EFAULT;
923 if (copy_from_user(page, buf, count))
924 goto out;
925
926 length = -EINVAL;
927 if (sscanf(page, "%d", &new_value) != 1)
928 goto out;
929
930 if (new_value && bool_pending_values)
931 security_set_bools(bool_num, bool_pending_values);
932
933 length = count;
934
935 out:
936 mutex_unlock(&sel_mutex);
937 if (page)
938 free_page((unsigned long) page);
939 return length;
940 }
941
942 static const struct file_operations sel_commit_bools_ops = {
943 .write = sel_commit_bools_write,
944 };
945
946 static void sel_remove_entries(struct dentry *de)
947 {
948 struct list_head *node;
949
950 spin_lock(&dcache_lock);
951 node = de->d_subdirs.next;
952 while (node != &de->d_subdirs) {
953 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
954 list_del_init(node);
955
956 if (d->d_inode) {
957 d = dget_locked(d);
958 spin_unlock(&dcache_lock);
959 d_delete(d);
960 simple_unlink(de->d_inode, d);
961 dput(d);
962 spin_lock(&dcache_lock);
963 }
964 node = de->d_subdirs.next;
965 }
966
967 spin_unlock(&dcache_lock);
968 }
969
970 #define BOOL_DIR_NAME "booleans"
971
972 static int sel_make_bools(void)
973 {
974 int i, ret = 0;
975 ssize_t len;
976 struct dentry *dentry = NULL;
977 struct dentry *dir = bool_dir;
978 struct inode *inode = NULL;
979 struct inode_security_struct *isec;
980 char **names = NULL, *page;
981 int num;
982 int *values = NULL;
983 u32 sid;
984
985 /* remove any existing files */
986 kfree(bool_pending_names);
987 kfree(bool_pending_values);
988 bool_pending_names = NULL;
989 bool_pending_values = NULL;
990
991 sel_remove_entries(dir);
992
993 page = (char *)get_zeroed_page(GFP_KERNEL);
994 if (!page)
995 return -ENOMEM;
996
997 ret = security_get_bools(&num, &names, &values);
998 if (ret != 0)
999 goto out;
1000
1001 for (i = 0; i < num; i++) {
1002 dentry = d_alloc_name(dir, names[i]);
1003 if (!dentry) {
1004 ret = -ENOMEM;
1005 goto err;
1006 }
1007 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1008 if (!inode) {
1009 ret = -ENOMEM;
1010 goto err;
1011 }
1012
1013 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1014 if (len < 0) {
1015 ret = -EINVAL;
1016 goto err;
1017 } else if (len >= PAGE_SIZE) {
1018 ret = -ENAMETOOLONG;
1019 goto err;
1020 }
1021 isec = (struct inode_security_struct *)inode->i_security;
1022 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1023 if (ret)
1024 goto err;
1025 isec->sid = sid;
1026 isec->initialized = 1;
1027 inode->i_fop = &sel_bool_ops;
1028 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1029 d_add(dentry, inode);
1030 }
1031 bool_num = num;
1032 bool_pending_names = names;
1033 bool_pending_values = values;
1034 out:
1035 free_page((unsigned long)page);
1036 return ret;
1037 err:
1038 if (names) {
1039 for (i = 0; i < num; i++)
1040 kfree(names[i]);
1041 kfree(names);
1042 }
1043 kfree(values);
1044 sel_remove_entries(dir);
1045 ret = -ENOMEM;
1046 goto out;
1047 }
1048
1049 #define NULL_FILE_NAME "null"
1050
1051 struct dentry *selinux_null;
1052
1053 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1054 size_t count, loff_t *ppos)
1055 {
1056 char tmpbuf[TMPBUFLEN];
1057 ssize_t length;
1058
1059 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1060 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1061 }
1062
1063 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1064 const char __user *buf,
1065 size_t count, loff_t *ppos)
1066
1067 {
1068 char *page;
1069 ssize_t ret;
1070 int new_value;
1071
1072 if (count >= PAGE_SIZE) {
1073 ret = -ENOMEM;
1074 goto out;
1075 }
1076
1077 if (*ppos != 0) {
1078 /* No partial writes. */
1079 ret = -EINVAL;
1080 goto out;
1081 }
1082
1083 page = (char *)get_zeroed_page(GFP_KERNEL);
1084 if (!page) {
1085 ret = -ENOMEM;
1086 goto out;
1087 }
1088
1089 if (copy_from_user(page, buf, count)) {
1090 ret = -EFAULT;
1091 goto out_free;
1092 }
1093
1094 if (sscanf(page, "%u", &new_value) != 1) {
1095 ret = -EINVAL;
1096 goto out;
1097 }
1098
1099 if (new_value != avc_cache_threshold) {
1100 ret = task_has_security(current, SECURITY__SETSECPARAM);
1101 if (ret)
1102 goto out_free;
1103 avc_cache_threshold = new_value;
1104 }
1105 ret = count;
1106 out_free:
1107 free_page((unsigned long)page);
1108 out:
1109 return ret;
1110 }
1111
1112 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1113 size_t count, loff_t *ppos)
1114 {
1115 char *page;
1116 ssize_t ret = 0;
1117
1118 page = (char *)__get_free_page(GFP_KERNEL);
1119 if (!page) {
1120 ret = -ENOMEM;
1121 goto out;
1122 }
1123 ret = avc_get_hash_stats(page);
1124 if (ret >= 0)
1125 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1126 free_page((unsigned long)page);
1127 out:
1128 return ret;
1129 }
1130
1131 static const struct file_operations sel_avc_cache_threshold_ops = {
1132 .read = sel_read_avc_cache_threshold,
1133 .write = sel_write_avc_cache_threshold,
1134 };
1135
1136 static const struct file_operations sel_avc_hash_stats_ops = {
1137 .read = sel_read_avc_hash_stats,
1138 };
1139
1140 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1141 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1142 {
1143 int cpu;
1144
1145 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1146 if (!cpu_possible(cpu))
1147 continue;
1148 *idx = cpu + 1;
1149 return &per_cpu(avc_cache_stats, cpu);
1150 }
1151 return NULL;
1152 }
1153
1154 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1155 {
1156 loff_t n = *pos - 1;
1157
1158 if (*pos == 0)
1159 return SEQ_START_TOKEN;
1160
1161 return sel_avc_get_stat_idx(&n);
1162 }
1163
1164 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1165 {
1166 return sel_avc_get_stat_idx(pos);
1167 }
1168
1169 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1170 {
1171 struct avc_cache_stats *st = v;
1172
1173 if (v == SEQ_START_TOKEN)
1174 seq_printf(seq, "lookups hits misses allocations reclaims "
1175 "frees\n");
1176 else
1177 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1178 st->hits, st->misses, st->allocations,
1179 st->reclaims, st->frees);
1180 return 0;
1181 }
1182
1183 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1184 { }
1185
1186 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1187 .start = sel_avc_stats_seq_start,
1188 .next = sel_avc_stats_seq_next,
1189 .show = sel_avc_stats_seq_show,
1190 .stop = sel_avc_stats_seq_stop,
1191 };
1192
1193 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1194 {
1195 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1196 }
1197
1198 static const struct file_operations sel_avc_cache_stats_ops = {
1199 .open = sel_open_avc_cache_stats,
1200 .read = seq_read,
1201 .llseek = seq_lseek,
1202 .release = seq_release,
1203 };
1204 #endif
1205
1206 static int sel_make_avc_files(struct dentry *dir)
1207 {
1208 int i, ret = 0;
1209 static struct tree_descr files[] = {
1210 { "cache_threshold",
1211 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1212 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1213 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1214 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1215 #endif
1216 };
1217
1218 for (i = 0; i < ARRAY_SIZE(files); i++) {
1219 struct inode *inode;
1220 struct dentry *dentry;
1221
1222 dentry = d_alloc_name(dir, files[i].name);
1223 if (!dentry) {
1224 ret = -ENOMEM;
1225 goto out;
1226 }
1227
1228 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1229 if (!inode) {
1230 ret = -ENOMEM;
1231 goto out;
1232 }
1233 inode->i_fop = files[i].ops;
1234 inode->i_ino = ++sel_last_ino;
1235 d_add(dentry, inode);
1236 }
1237 out:
1238 return ret;
1239 }
1240
1241 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1242 size_t count, loff_t *ppos)
1243 {
1244 struct inode *inode;
1245 char *con;
1246 u32 sid, len;
1247 ssize_t ret;
1248
1249 inode = file->f_path.dentry->d_inode;
1250 sid = inode->i_ino&SEL_INO_MASK;
1251 ret = security_sid_to_context(sid, &con, &len);
1252 if (ret < 0)
1253 return ret;
1254
1255 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1256 kfree(con);
1257 return ret;
1258 }
1259
1260 static const struct file_operations sel_initcon_ops = {
1261 .read = sel_read_initcon,
1262 };
1263
1264 static int sel_make_initcon_files(struct dentry *dir)
1265 {
1266 int i, ret = 0;
1267
1268 for (i = 1; i <= SECINITSID_NUM; i++) {
1269 struct inode *inode;
1270 struct dentry *dentry;
1271 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1272 if (!dentry) {
1273 ret = -ENOMEM;
1274 goto out;
1275 }
1276
1277 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1278 if (!inode) {
1279 ret = -ENOMEM;
1280 goto out;
1281 }
1282 inode->i_fop = &sel_initcon_ops;
1283 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1284 d_add(dentry, inode);
1285 }
1286 out:
1287 return ret;
1288 }
1289
1290 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1291 {
1292 return a / b - (a % b < 0);
1293 }
1294
1295 static inline unsigned long sel_class_to_ino(u16 class)
1296 {
1297 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1298 }
1299
1300 static inline u16 sel_ino_to_class(unsigned long ino)
1301 {
1302 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1303 }
1304
1305 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1306 {
1307 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1308 }
1309
1310 static inline u32 sel_ino_to_perm(unsigned long ino)
1311 {
1312 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1313 }
1314
1315 static ssize_t sel_read_class(struct file *file, char __user *buf,
1316 size_t count, loff_t *ppos)
1317 {
1318 ssize_t rc, len;
1319 char *page;
1320 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1321
1322 page = (char *)__get_free_page(GFP_KERNEL);
1323 if (!page) {
1324 rc = -ENOMEM;
1325 goto out;
1326 }
1327
1328 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1329 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1330 free_page((unsigned long)page);
1331 out:
1332 return rc;
1333 }
1334
1335 static const struct file_operations sel_class_ops = {
1336 .read = sel_read_class,
1337 };
1338
1339 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1340 size_t count, loff_t *ppos)
1341 {
1342 ssize_t rc, len;
1343 char *page;
1344 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1345
1346 page = (char *)__get_free_page(GFP_KERNEL);
1347 if (!page) {
1348 rc = -ENOMEM;
1349 goto out;
1350 }
1351
1352 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1353 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1354 free_page((unsigned long)page);
1355 out:
1356 return rc;
1357 }
1358
1359 static const struct file_operations sel_perm_ops = {
1360 .read = sel_read_perm,
1361 };
1362
1363 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1364 size_t count, loff_t *ppos)
1365 {
1366 int value;
1367 char tmpbuf[TMPBUFLEN];
1368 ssize_t length;
1369 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1370
1371 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1372 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1373
1374 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1375 }
1376
1377 static const struct file_operations sel_policycap_ops = {
1378 .read = sel_read_policycap,
1379 };
1380
1381 static int sel_make_perm_files(char *objclass, int classvalue,
1382 struct dentry *dir)
1383 {
1384 int i, rc = 0, nperms;
1385 char **perms;
1386
1387 rc = security_get_permissions(objclass, &perms, &nperms);
1388 if (rc)
1389 goto out;
1390
1391 for (i = 0; i < nperms; i++) {
1392 struct inode *inode;
1393 struct dentry *dentry;
1394
1395 dentry = d_alloc_name(dir, perms[i]);
1396 if (!dentry) {
1397 rc = -ENOMEM;
1398 goto out1;
1399 }
1400
1401 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1402 if (!inode) {
1403 rc = -ENOMEM;
1404 goto out1;
1405 }
1406 inode->i_fop = &sel_perm_ops;
1407 /* i+1 since perm values are 1-indexed */
1408 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1409 d_add(dentry, inode);
1410 }
1411
1412 out1:
1413 for (i = 0; i < nperms; i++)
1414 kfree(perms[i]);
1415 kfree(perms);
1416 out:
1417 return rc;
1418 }
1419
1420 static int sel_make_class_dir_entries(char *classname, int index,
1421 struct dentry *dir)
1422 {
1423 struct dentry *dentry = NULL;
1424 struct inode *inode = NULL;
1425 int rc;
1426
1427 dentry = d_alloc_name(dir, "index");
1428 if (!dentry) {
1429 rc = -ENOMEM;
1430 goto out;
1431 }
1432
1433 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1434 if (!inode) {
1435 rc = -ENOMEM;
1436 goto out;
1437 }
1438
1439 inode->i_fop = &sel_class_ops;
1440 inode->i_ino = sel_class_to_ino(index);
1441 d_add(dentry, inode);
1442
1443 dentry = d_alloc_name(dir, "perms");
1444 if (!dentry) {
1445 rc = -ENOMEM;
1446 goto out;
1447 }
1448
1449 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1450 if (rc)
1451 goto out;
1452
1453 rc = sel_make_perm_files(classname, index, dentry);
1454
1455 out:
1456 return rc;
1457 }
1458
1459 static void sel_remove_classes(void)
1460 {
1461 struct list_head *class_node;
1462
1463 list_for_each(class_node, &class_dir->d_subdirs) {
1464 struct dentry *class_subdir = list_entry(class_node,
1465 struct dentry, d_u.d_child);
1466 struct list_head *class_subdir_node;
1467
1468 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1469 struct dentry *d = list_entry(class_subdir_node,
1470 struct dentry, d_u.d_child);
1471
1472 if (d->d_inode)
1473 if (d->d_inode->i_mode & S_IFDIR)
1474 sel_remove_entries(d);
1475 }
1476
1477 sel_remove_entries(class_subdir);
1478 }
1479
1480 sel_remove_entries(class_dir);
1481 }
1482
1483 static int sel_make_classes(void)
1484 {
1485 int rc = 0, nclasses, i;
1486 char **classes;
1487
1488 /* delete any existing entries */
1489 sel_remove_classes();
1490
1491 rc = security_get_classes(&classes, &nclasses);
1492 if (rc < 0)
1493 goto out;
1494
1495 /* +2 since classes are 1-indexed */
1496 last_class_ino = sel_class_to_ino(nclasses+2);
1497
1498 for (i = 0; i < nclasses; i++) {
1499 struct dentry *class_name_dir;
1500
1501 class_name_dir = d_alloc_name(class_dir, classes[i]);
1502 if (!class_name_dir) {
1503 rc = -ENOMEM;
1504 goto out1;
1505 }
1506
1507 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1508 &last_class_ino);
1509 if (rc)
1510 goto out1;
1511
1512 /* i+1 since class values are 1-indexed */
1513 rc = sel_make_class_dir_entries(classes[i], i+1,
1514 class_name_dir);
1515 if (rc)
1516 goto out1;
1517 }
1518
1519 out1:
1520 for (i = 0; i < nclasses; i++)
1521 kfree(classes[i]);
1522 kfree(classes);
1523 out:
1524 return rc;
1525 }
1526
1527 static int sel_make_policycap(void)
1528 {
1529 unsigned int iter;
1530 struct dentry *dentry = NULL;
1531 struct inode *inode = NULL;
1532
1533 sel_remove_entries(policycap_dir);
1534
1535 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1536 if (iter < ARRAY_SIZE(policycap_names))
1537 dentry = d_alloc_name(policycap_dir,
1538 policycap_names[iter]);
1539 else
1540 dentry = d_alloc_name(policycap_dir, "unknown");
1541
1542 if (dentry == NULL)
1543 return -ENOMEM;
1544
1545 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1546 if (inode == NULL)
1547 return -ENOMEM;
1548
1549 inode->i_fop = &sel_policycap_ops;
1550 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1551 d_add(dentry, inode);
1552 }
1553
1554 return 0;
1555 }
1556
1557 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1558 unsigned long *ino)
1559 {
1560 int ret = 0;
1561 struct inode *inode;
1562
1563 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1564 if (!inode) {
1565 ret = -ENOMEM;
1566 goto out;
1567 }
1568 inode->i_op = &simple_dir_inode_operations;
1569 inode->i_fop = &simple_dir_operations;
1570 inode->i_ino = ++(*ino);
1571 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1572 inc_nlink(inode);
1573 d_add(dentry, inode);
1574 /* bump link count on parent directory, too */
1575 inc_nlink(dir);
1576 out:
1577 return ret;
1578 }
1579
1580 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1581 {
1582 int ret;
1583 struct dentry *dentry;
1584 struct inode *inode, *root_inode;
1585 struct inode_security_struct *isec;
1586
1587 static struct tree_descr selinux_files[] = {
1588 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1589 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1590 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1591 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1592 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1593 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1594 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1595 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1596 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1597 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1598 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1599 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1600 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1601 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1602 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1603 /* last one */ {""}
1604 };
1605 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1606 if (ret)
1607 goto err;
1608
1609 root_inode = sb->s_root->d_inode;
1610
1611 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1612 if (!dentry) {
1613 ret = -ENOMEM;
1614 goto err;
1615 }
1616
1617 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1618 if (ret)
1619 goto err;
1620
1621 bool_dir = dentry;
1622
1623 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1624 if (!dentry) {
1625 ret = -ENOMEM;
1626 goto err;
1627 }
1628
1629 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1630 if (!inode) {
1631 ret = -ENOMEM;
1632 goto err;
1633 }
1634 inode->i_ino = ++sel_last_ino;
1635 isec = (struct inode_security_struct *)inode->i_security;
1636 isec->sid = SECINITSID_DEVNULL;
1637 isec->sclass = SECCLASS_CHR_FILE;
1638 isec->initialized = 1;
1639
1640 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1641 d_add(dentry, inode);
1642 selinux_null = dentry;
1643
1644 dentry = d_alloc_name(sb->s_root, "avc");
1645 if (!dentry) {
1646 ret = -ENOMEM;
1647 goto err;
1648 }
1649
1650 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1651 if (ret)
1652 goto err;
1653
1654 ret = sel_make_avc_files(dentry);
1655 if (ret)
1656 goto err;
1657
1658 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1659 if (!dentry) {
1660 ret = -ENOMEM;
1661 goto err;
1662 }
1663
1664 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1665 if (ret)
1666 goto err;
1667
1668 ret = sel_make_initcon_files(dentry);
1669 if (ret)
1670 goto err;
1671
1672 dentry = d_alloc_name(sb->s_root, "class");
1673 if (!dentry) {
1674 ret = -ENOMEM;
1675 goto err;
1676 }
1677
1678 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1679 if (ret)
1680 goto err;
1681
1682 class_dir = dentry;
1683
1684 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1685 if (!dentry) {
1686 ret = -ENOMEM;
1687 goto err;
1688 }
1689
1690 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1691 if (ret)
1692 goto err;
1693
1694 policycap_dir = dentry;
1695
1696 out:
1697 return ret;
1698 err:
1699 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1700 __func__);
1701 goto out;
1702 }
1703
1704 static int sel_get_sb(struct file_system_type *fs_type,
1705 int flags, const char *dev_name, void *data,
1706 struct vfsmount *mnt)
1707 {
1708 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1709 }
1710
1711 static struct file_system_type sel_fs_type = {
1712 .name = "selinuxfs",
1713 .get_sb = sel_get_sb,
1714 .kill_sb = kill_litter_super,
1715 };
1716
1717 struct vfsmount *selinuxfs_mount;
1718
1719 static int __init init_sel_fs(void)
1720 {
1721 int err;
1722
1723 if (!selinux_enabled)
1724 return 0;
1725 err = register_filesystem(&sel_fs_type);
1726 if (!err) {
1727 selinuxfs_mount = kern_mount(&sel_fs_type);
1728 if (IS_ERR(selinuxfs_mount)) {
1729 printk(KERN_ERR "selinuxfs: could not mount!\n");
1730 err = PTR_ERR(selinuxfs_mount);
1731 selinuxfs_mount = NULL;
1732 }
1733 }
1734 return err;
1735 }
1736
1737 __initcall(init_sel_fs);
1738
1739 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1740 void exit_sel_fs(void)
1741 {
1742 unregister_filesystem(&sel_fs_type);
1743 }
1744 #endif
Support for the Chinese Samsung S3C2440 based development boards