?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ACPI: EC: Workaround for optimized controllers
[linux-2.6/mini2440.git] / security / selinux / selinuxfs.c
blobf5f3e6da5da76f1e2151caca3e969bcc9de17788
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 /* global data for classes */
71 static struct dentry *class_dir = NULL;
72 static unsigned long last_class_ino;
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 struct task_security_struct *tsec;
81
82 tsec = tsk->security;
83 if (!tsec)
84 return -EACCES;
85
86 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
87 SECCLASS_SECURITY, perms, NULL);
88 }
89
90 enum sel_inos {
91 SEL_ROOT_INO = 2,
92 SEL_LOAD, /* load policy */
93 SEL_ENFORCE, /* get or set enforcing status */
94 SEL_CONTEXT, /* validate context */
95 SEL_ACCESS, /* compute access decision */
96 SEL_CREATE, /* compute create labeling decision */
97 SEL_RELABEL, /* compute relabeling decision */
98 SEL_USER, /* compute reachable user contexts */
99 SEL_POLICYVERS, /* return policy version for this kernel */
100 SEL_COMMIT_BOOLS, /* commit new boolean values */
101 SEL_MLS, /* return if MLS policy is enabled */
102 SEL_DISABLE, /* disable SELinux until next reboot */
103 SEL_MEMBER, /* compute polyinstantiation membership decision */
104 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
105 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
106 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
107 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
108 SEL_INO_NEXT, /* The next inode number to use */
109 };
110
111 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
112
113 #define SEL_INITCON_INO_OFFSET 0x01000000
114 #define SEL_BOOL_INO_OFFSET 0x02000000
115 #define SEL_CLASS_INO_OFFSET 0x04000000
116 #define SEL_INO_MASK 0x00ffffff
117
118 #define TMPBUFLEN 12
119 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
120 size_t count, loff_t *ppos)
121 {
122 char tmpbuf[TMPBUFLEN];
123 ssize_t length;
124
125 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
126 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
127 }
128
129 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
130 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
131 size_t count, loff_t *ppos)
132
133 {
134 char *page;
135 ssize_t length;
136 int new_value;
137
138 if (count >= PAGE_SIZE)
139 return -ENOMEM;
140 if (*ppos != 0) {
141 /* No partial writes. */
142 return -EINVAL;
143 }
144 page = (char*)get_zeroed_page(GFP_KERNEL);
145 if (!page)
146 return -ENOMEM;
147 length = -EFAULT;
148 if (copy_from_user(page, buf, count))
149 goto out;
150
151 length = -EINVAL;
152 if (sscanf(page, "%d", &new_value) != 1)
153 goto out;
154
155 if (new_value != selinux_enforcing) {
156 length = task_has_security(current, SECURITY__SETENFORCE);
157 if (length)
158 goto out;
159 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
160 "enforcing=%d old_enforcing=%d auid=%u", new_value,
161 selinux_enforcing,
162 audit_get_loginuid(current->audit_context));
163 selinux_enforcing = new_value;
164 if (selinux_enforcing)
165 avc_ss_reset(0);
166 selnl_notify_setenforce(selinux_enforcing);
167 }
168 length = count;
169 out:
170 free_page((unsigned long) page);
171 return length;
172 }
173 #else
174 #define sel_write_enforce NULL
175 #endif
176
177 static const struct file_operations sel_enforce_ops = {
178 .read = sel_read_enforce,
179 .write = sel_write_enforce,
180 };
181
182 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
183 size_t count, loff_t *ppos)
184 {
185 char tmpbuf[TMPBUFLEN];
186 ssize_t length;
187 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
188 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
189 security_get_reject_unknown() : !security_get_allow_unknown();
190
191 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
192 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
193 }
194
195 static const struct file_operations sel_handle_unknown_ops = {
196 .read = sel_read_handle_unknown,
197 };
198
199 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
200 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
201 size_t count, loff_t *ppos)
202
203 {
204 char *page;
205 ssize_t length;
206 int new_value;
207 extern int selinux_disable(void);
208
209 if (count >= PAGE_SIZE)
210 return -ENOMEM;
211 if (*ppos != 0) {
212 /* No partial writes. */
213 return -EINVAL;
214 }
215 page = (char*)get_zeroed_page(GFP_KERNEL);
216 if (!page)
217 return -ENOMEM;
218 length = -EFAULT;
219 if (copy_from_user(page, buf, count))
220 goto out;
221
222 length = -EINVAL;
223 if (sscanf(page, "%d", &new_value) != 1)
224 goto out;
225
226 if (new_value) {
227 length = selinux_disable();
228 if (length < 0)
229 goto out;
230 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
231 "selinux=0 auid=%u",
232 audit_get_loginuid(current->audit_context));
233 }
234
235 length = count;
236 out:
237 free_page((unsigned long) page);
238 return length;
239 }
240 #else
241 #define sel_write_disable NULL
242 #endif
243
244 static const struct file_operations sel_disable_ops = {
245 .write = sel_write_disable,
246 };
247
248 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
249 size_t count, loff_t *ppos)
250 {
251 char tmpbuf[TMPBUFLEN];
252 ssize_t length;
253
254 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
255 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
256 }
257
258 static const struct file_operations sel_policyvers_ops = {
259 .read = sel_read_policyvers,
260 };
261
262 /* declaration for sel_write_load */
263 static int sel_make_bools(void);
264 static int sel_make_classes(void);
265
266 /* declaration for sel_make_class_dirs */
267 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
268 unsigned long *ino);
269
270 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
271 size_t count, loff_t *ppos)
272 {
273 char tmpbuf[TMPBUFLEN];
274 ssize_t length;
275
276 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
277 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
278 }
279
280 static const struct file_operations sel_mls_ops = {
281 .read = sel_read_mls,
282 };
283
284 static ssize_t sel_write_load(struct file * file, const char __user * buf,
285 size_t count, loff_t *ppos)
286
287 {
288 int ret;
289 ssize_t length;
290 void *data = NULL;
291
292 mutex_lock(&sel_mutex);
293
294 length = task_has_security(current, SECURITY__LOAD_POLICY);
295 if (length)
296 goto out;
297
298 if (*ppos != 0) {
299 /* No partial writes. */
300 length = -EINVAL;
301 goto out;
302 }
303
304 if ((count > 64 * 1024 * 1024)
305 || (data = vmalloc(count)) == NULL) {
306 length = -ENOMEM;
307 goto out;
308 }
309
310 length = -EFAULT;
311 if (copy_from_user(data, buf, count) != 0)
312 goto out;
313
314 length = security_load_policy(data, count);
315 if (length)
316 goto out;
317
318 ret = sel_make_bools();
319 if (ret) {
320 length = ret;
321 goto out1;
322 }
323
324 ret = sel_make_classes();
325 if (ret)
326 length = ret;
327 else
328 length = count;
329
330 out1:
331
332 printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
333 (security_get_reject_unknown() ? "reject" :
334 (security_get_allow_unknown() ? "allow" : "deny")));
335
336 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
337 "policy loaded auid=%u",
338 audit_get_loginuid(current->audit_context));
339 out:
340 mutex_unlock(&sel_mutex);
341 vfree(data);
342 return length;
343 }
344
345 static const struct file_operations sel_load_ops = {
346 .write = sel_write_load,
347 };
348
349 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
350 {
351 char *canon;
352 u32 sid, len;
353 ssize_t length;
354
355 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
356 if (length)
357 return length;
358
359 length = security_context_to_sid(buf, size, &sid);
360 if (length < 0)
361 return length;
362
363 length = security_sid_to_context(sid, &canon, &len);
364 if (length < 0)
365 return length;
366
367 if (len > SIMPLE_TRANSACTION_LIMIT) {
368 printk(KERN_ERR "%s: context size (%u) exceeds payload "
369 "max\n", __FUNCTION__, len);
370 length = -ERANGE;
371 goto out;
372 }
373
374 memcpy(buf, canon, len);
375 length = len;
376 out:
377 kfree(canon);
378 return length;
379 }
380
381 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
382 size_t count, loff_t *ppos)
383 {
384 char tmpbuf[TMPBUFLEN];
385 ssize_t length;
386
387 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
388 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
389 }
390
391 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
392 size_t count, loff_t *ppos)
393 {
394 char *page;
395 ssize_t length;
396 unsigned int new_value;
397
398 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
399 if (length)
400 return length;
401
402 if (count >= PAGE_SIZE)
403 return -ENOMEM;
404 if (*ppos != 0) {
405 /* No partial writes. */
406 return -EINVAL;
407 }
408 page = (char*)get_zeroed_page(GFP_KERNEL);
409 if (!page)
410 return -ENOMEM;
411 length = -EFAULT;
412 if (copy_from_user(page, buf, count))
413 goto out;
414
415 length = -EINVAL;
416 if (sscanf(page, "%u", &new_value) != 1)
417 goto out;
418
419 selinux_checkreqprot = new_value ? 1 : 0;
420 length = count;
421 out:
422 free_page((unsigned long) page);
423 return length;
424 }
425 static const struct file_operations sel_checkreqprot_ops = {
426 .read = sel_read_checkreqprot,
427 .write = sel_write_checkreqprot,
428 };
429
430 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
431 size_t count, loff_t *ppos)
432 {
433 char tmpbuf[TMPBUFLEN];
434 ssize_t length;
435
436 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
437 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
438 }
439
440 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
441 size_t count, loff_t *ppos)
442 {
443 char *page;
444 ssize_t length;
445 int new_value;
446
447 length = task_has_security(current, SECURITY__LOAD_POLICY);
448 if (length)
449 return length;
450
451 if (count >= PAGE_SIZE)
452 return -ENOMEM;
453 if (*ppos != 0) {
454 /* No partial writes. */
455 return -EINVAL;
456 }
457 page = (char*)get_zeroed_page(GFP_KERNEL);
458 if (!page)
459 return -ENOMEM;
460 length = -EFAULT;
461 if (copy_from_user(page, buf, count))
462 goto out;
463
464 length = -EINVAL;
465 if (sscanf(page, "%d", &new_value) != 1)
466 goto out;
467
468 selinux_compat_net = new_value ? 1 : 0;
469 length = count;
470 out:
471 free_page((unsigned long) page);
472 return length;
473 }
474 static const struct file_operations sel_compat_net_ops = {
475 .read = sel_read_compat_net,
476 .write = sel_write_compat_net,
477 };
478
479 /*
480 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
481 */
482 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
483 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
484 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
485 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
486 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
487
488 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
489 [SEL_ACCESS] = sel_write_access,
490 [SEL_CREATE] = sel_write_create,
491 [SEL_RELABEL] = sel_write_relabel,
492 [SEL_USER] = sel_write_user,
493 [SEL_MEMBER] = sel_write_member,
494 [SEL_CONTEXT] = sel_write_context,
495 };
496
497 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
498 {
499 ino_t ino = file->f_path.dentry->d_inode->i_ino;
500 char *data;
501 ssize_t rv;
502
503 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
504 return -EINVAL;
505
506 data = simple_transaction_get(file, buf, size);
507 if (IS_ERR(data))
508 return PTR_ERR(data);
509
510 rv = write_op[ino](file, data, size);
511 if (rv>0) {
512 simple_transaction_set(file, rv);
513 rv = size;
514 }
515 return rv;
516 }
517
518 static const struct file_operations transaction_ops = {
519 .write = selinux_transaction_write,
520 .read = simple_transaction_read,
521 .release = simple_transaction_release,
522 };
523
524 /*
525 * payload - write methods
526 * If the method has a response, the response should be put in buf,
527 * and the length returned. Otherwise return 0 or and -error.
528 */
529
530 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
531 {
532 char *scon, *tcon;
533 u32 ssid, tsid;
534 u16 tclass;
535 u32 req;
536 struct av_decision avd;
537 ssize_t length;
538
539 length = task_has_security(current, SECURITY__COMPUTE_AV);
540 if (length)
541 return length;
542
543 length = -ENOMEM;
544 scon = kzalloc(size+1, GFP_KERNEL);
545 if (!scon)
546 return length;
547
548 tcon = kzalloc(size+1, GFP_KERNEL);
549 if (!tcon)
550 goto out;
551
552 length = -EINVAL;
553 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
554 goto out2;
555
556 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
557 if (length < 0)
558 goto out2;
559 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
560 if (length < 0)
561 goto out2;
562
563 length = security_compute_av(ssid, tsid, tclass, req, &avd);
564 if (length < 0)
565 goto out2;
566
567 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
568 "%x %x %x %x %u",
569 avd.allowed, avd.decided,
570 avd.auditallow, avd.auditdeny,
571 avd.seqno);
572 out2:
573 kfree(tcon);
574 out:
575 kfree(scon);
576 return length;
577 }
578
579 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
580 {
581 char *scon, *tcon;
582 u32 ssid, tsid, newsid;
583 u16 tclass;
584 ssize_t length;
585 char *newcon;
586 u32 len;
587
588 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
589 if (length)
590 return length;
591
592 length = -ENOMEM;
593 scon = kzalloc(size+1, GFP_KERNEL);
594 if (!scon)
595 return length;
596
597 tcon = kzalloc(size+1, GFP_KERNEL);
598 if (!tcon)
599 goto out;
600
601 length = -EINVAL;
602 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
603 goto out2;
604
605 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
606 if (length < 0)
607 goto out2;
608 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
609 if (length < 0)
610 goto out2;
611
612 length = security_transition_sid(ssid, tsid, tclass, &newsid);
613 if (length < 0)
614 goto out2;
615
616 length = security_sid_to_context(newsid, &newcon, &len);
617 if (length < 0)
618 goto out2;
619
620 if (len > SIMPLE_TRANSACTION_LIMIT) {
621 printk(KERN_ERR "%s: context size (%u) exceeds payload "
622 "max\n", __FUNCTION__, len);
623 length = -ERANGE;
624 goto out3;
625 }
626
627 memcpy(buf, newcon, len);
628 length = len;
629 out3:
630 kfree(newcon);
631 out2:
632 kfree(tcon);
633 out:
634 kfree(scon);
635 return length;
636 }
637
638 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
639 {
640 char *scon, *tcon;
641 u32 ssid, tsid, newsid;
642 u16 tclass;
643 ssize_t length;
644 char *newcon;
645 u32 len;
646
647 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
648 if (length)
649 return length;
650
651 length = -ENOMEM;
652 scon = kzalloc(size+1, GFP_KERNEL);
653 if (!scon)
654 return length;
655
656 tcon = kzalloc(size+1, GFP_KERNEL);
657 if (!tcon)
658 goto out;
659
660 length = -EINVAL;
661 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
662 goto out2;
663
664 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
665 if (length < 0)
666 goto out2;
667 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
668 if (length < 0)
669 goto out2;
670
671 length = security_change_sid(ssid, tsid, tclass, &newsid);
672 if (length < 0)
673 goto out2;
674
675 length = security_sid_to_context(newsid, &newcon, &len);
676 if (length < 0)
677 goto out2;
678
679 if (len > SIMPLE_TRANSACTION_LIMIT) {
680 length = -ERANGE;
681 goto out3;
682 }
683
684 memcpy(buf, newcon, len);
685 length = len;
686 out3:
687 kfree(newcon);
688 out2:
689 kfree(tcon);
690 out:
691 kfree(scon);
692 return length;
693 }
694
695 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
696 {
697 char *con, *user, *ptr;
698 u32 sid, *sids;
699 ssize_t length;
700 char *newcon;
701 int i, rc;
702 u32 len, nsids;
703
704 length = task_has_security(current, SECURITY__COMPUTE_USER);
705 if (length)
706 return length;
707
708 length = -ENOMEM;
709 con = kzalloc(size+1, GFP_KERNEL);
710 if (!con)
711 return length;
712
713 user = kzalloc(size+1, GFP_KERNEL);
714 if (!user)
715 goto out;
716
717 length = -EINVAL;
718 if (sscanf(buf, "%s %s", con, user) != 2)
719 goto out2;
720
721 length = security_context_to_sid(con, strlen(con)+1, &sid);
722 if (length < 0)
723 goto out2;
724
725 length = security_get_user_sids(sid, user, &sids, &nsids);
726 if (length < 0)
727 goto out2;
728
729 length = sprintf(buf, "%u", nsids) + 1;
730 ptr = buf + length;
731 for (i = 0; i < nsids; i++) {
732 rc = security_sid_to_context(sids[i], &newcon, &len);
733 if (rc) {
734 length = rc;
735 goto out3;
736 }
737 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
738 kfree(newcon);
739 length = -ERANGE;
740 goto out3;
741 }
742 memcpy(ptr, newcon, len);
743 kfree(newcon);
744 ptr += len;
745 length += len;
746 }
747 out3:
748 kfree(sids);
749 out2:
750 kfree(user);
751 out:
752 kfree(con);
753 return length;
754 }
755
756 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
757 {
758 char *scon, *tcon;
759 u32 ssid, tsid, newsid;
760 u16 tclass;
761 ssize_t length;
762 char *newcon;
763 u32 len;
764
765 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
766 if (length)
767 return length;
768
769 length = -ENOMEM;
770 scon = kzalloc(size+1, GFP_KERNEL);
771 if (!scon)
772 return length;
773
774 tcon = kzalloc(size+1, GFP_KERNEL);
775 if (!tcon)
776 goto out;
777
778 length = -EINVAL;
779 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
780 goto out2;
781
782 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
783 if (length < 0)
784 goto out2;
785 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
786 if (length < 0)
787 goto out2;
788
789 length = security_member_sid(ssid, tsid, tclass, &newsid);
790 if (length < 0)
791 goto out2;
792
793 length = security_sid_to_context(newsid, &newcon, &len);
794 if (length < 0)
795 goto out2;
796
797 if (len > SIMPLE_TRANSACTION_LIMIT) {
798 printk(KERN_ERR "%s: context size (%u) exceeds payload "
799 "max\n", __FUNCTION__, len);
800 length = -ERANGE;
801 goto out3;
802 }
803
804 memcpy(buf, newcon, len);
805 length = len;
806 out3:
807 kfree(newcon);
808 out2:
809 kfree(tcon);
810 out:
811 kfree(scon);
812 return length;
813 }
814
815 static struct inode *sel_make_inode(struct super_block *sb, int mode)
816 {
817 struct inode *ret = new_inode(sb);
818
819 if (ret) {
820 ret->i_mode = mode;
821 ret->i_uid = ret->i_gid = 0;
822 ret->i_blocks = 0;
823 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
824 }
825 return ret;
826 }
827
828 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
829 size_t count, loff_t *ppos)
830 {
831 char *page = NULL;
832 ssize_t length;
833 ssize_t ret;
834 int cur_enforcing;
835 struct inode *inode;
836
837 mutex_lock(&sel_mutex);
838
839 ret = -EFAULT;
840
841 /* check to see if this file has been deleted */
842 if (!filep->f_op)
843 goto out;
844
845 if (count > PAGE_SIZE) {
846 ret = -EINVAL;
847 goto out;
848 }
849 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
850 ret = -ENOMEM;
851 goto out;
852 }
853
854 inode = filep->f_path.dentry->d_inode;
855 cur_enforcing = security_get_bool_value(inode->i_ino&SEL_INO_MASK);
856 if (cur_enforcing < 0) {
857 ret = cur_enforcing;
858 goto out;
859 }
860
861 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
862 bool_pending_values[inode->i_ino&SEL_INO_MASK]);
863 ret = simple_read_from_buffer(buf, count, ppos, page, length);
864 out:
865 mutex_unlock(&sel_mutex);
866 if (page)
867 free_page((unsigned long)page);
868 return ret;
869 }
870
871 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
872 size_t count, loff_t *ppos)
873 {
874 char *page = NULL;
875 ssize_t length = -EFAULT;
876 int new_value;
877 struct inode *inode;
878
879 mutex_lock(&sel_mutex);
880
881 length = task_has_security(current, SECURITY__SETBOOL);
882 if (length)
883 goto out;
884
885 /* check to see if this file has been deleted */
886 if (!filep->f_op)
887 goto out;
888
889 if (count >= PAGE_SIZE) {
890 length = -ENOMEM;
891 goto out;
892 }
893 if (*ppos != 0) {
894 /* No partial writes. */
895 goto out;
896 }
897 page = (char*)get_zeroed_page(GFP_KERNEL);
898 if (!page) {
899 length = -ENOMEM;
900 goto out;
901 }
902
903 if (copy_from_user(page, buf, count))
904 goto out;
905
906 length = -EINVAL;
907 if (sscanf(page, "%d", &new_value) != 1)
908 goto out;
909
910 if (new_value)
911 new_value = 1;
912
913 inode = filep->f_path.dentry->d_inode;
914 bool_pending_values[inode->i_ino&SEL_INO_MASK] = new_value;
915 length = count;
916
917 out:
918 mutex_unlock(&sel_mutex);
919 if (page)
920 free_page((unsigned long) page);
921 return length;
922 }
923
924 static const struct file_operations sel_bool_ops = {
925 .read = sel_read_bool,
926 .write = sel_write_bool,
927 };
928
929 static ssize_t sel_commit_bools_write(struct file *filep,
930 const char __user *buf,
931 size_t count, loff_t *ppos)
932 {
933 char *page = NULL;
934 ssize_t length = -EFAULT;
935 int new_value;
936
937 mutex_lock(&sel_mutex);
938
939 length = task_has_security(current, SECURITY__SETBOOL);
940 if (length)
941 goto out;
942
943 /* check to see if this file has been deleted */
944 if (!filep->f_op)
945 goto out;
946
947 if (count >= PAGE_SIZE) {
948 length = -ENOMEM;
949 goto out;
950 }
951 if (*ppos != 0) {
952 /* No partial writes. */
953 goto out;
954 }
955 page = (char*)get_zeroed_page(GFP_KERNEL);
956 if (!page) {
957 length = -ENOMEM;
958 goto out;
959 }
960
961 if (copy_from_user(page, buf, count))
962 goto out;
963
964 length = -EINVAL;
965 if (sscanf(page, "%d", &new_value) != 1)
966 goto out;
967
968 if (new_value && bool_pending_values) {
969 security_set_bools(bool_num, bool_pending_values);
970 }
971
972 length = count;
973
974 out:
975 mutex_unlock(&sel_mutex);
976 if (page)
977 free_page((unsigned long) page);
978 return length;
979 }
980
981 static const struct file_operations sel_commit_bools_ops = {
982 .write = sel_commit_bools_write,
983 };
984
985 /* partial revoke() from fs/proc/generic.c proc_kill_inodes */
986 static void sel_remove_entries(struct dentry *de)
987 {
988 struct list_head *p, *node;
989 struct super_block *sb = de->d_sb;
990
991 spin_lock(&dcache_lock);
992 node = de->d_subdirs.next;
993 while (node != &de->d_subdirs) {
994 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
995 list_del_init(node);
996
997 if (d->d_inode) {
998 d = dget_locked(d);
999 spin_unlock(&dcache_lock);
1000 d_delete(d);
1001 simple_unlink(de->d_inode, d);
1002 dput(d);
1003 spin_lock(&dcache_lock);
1004 }
1005 node = de->d_subdirs.next;
1006 }
1007
1008 spin_unlock(&dcache_lock);
1009
1010 file_list_lock();
1011 list_for_each(p, &sb->s_files) {
1012 struct file * filp = list_entry(p, struct file, f_u.fu_list);
1013 struct dentry * dentry = filp->f_path.dentry;
1014
1015 if (dentry->d_parent != de) {
1016 continue;
1017 }
1018 filp->f_op = NULL;
1019 }
1020 file_list_unlock();
1021 }
1022
1023 #define BOOL_DIR_NAME "booleans"
1024
1025 static int sel_make_bools(void)
1026 {
1027 int i, ret = 0;
1028 ssize_t len;
1029 struct dentry *dentry = NULL;
1030 struct dentry *dir = bool_dir;
1031 struct inode *inode = NULL;
1032 struct inode_security_struct *isec;
1033 char **names = NULL, *page;
1034 int num;
1035 int *values = NULL;
1036 u32 sid;
1037
1038 /* remove any existing files */
1039 kfree(bool_pending_values);
1040 bool_pending_values = NULL;
1041
1042 sel_remove_entries(dir);
1043
1044 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1045 return -ENOMEM;
1046
1047 ret = security_get_bools(&num, &names, &values);
1048 if (ret != 0)
1049 goto out;
1050
1051 for (i = 0; i < num; i++) {
1052 dentry = d_alloc_name(dir, names[i]);
1053 if (!dentry) {
1054 ret = -ENOMEM;
1055 goto err;
1056 }
1057 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1058 if (!inode) {
1059 ret = -ENOMEM;
1060 goto err;
1061 }
1062
1063 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1064 if (len < 0) {
1065 ret = -EINVAL;
1066 goto err;
1067 } else if (len >= PAGE_SIZE) {
1068 ret = -ENAMETOOLONG;
1069 goto err;
1070 }
1071 isec = (struct inode_security_struct*)inode->i_security;
1072 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1073 goto err;
1074 isec->sid = sid;
1075 isec->initialized = 1;
1076 inode->i_fop = &sel_bool_ops;
1077 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1078 d_add(dentry, inode);
1079 }
1080 bool_num = num;
1081 bool_pending_values = values;
1082 out:
1083 free_page((unsigned long)page);
1084 if (names) {
1085 for (i = 0; i < num; i++)
1086 kfree(names[i]);
1087 kfree(names);
1088 }
1089 return ret;
1090 err:
1091 kfree(values);
1092 sel_remove_entries(dir);
1093 ret = -ENOMEM;
1094 goto out;
1095 }
1096
1097 #define NULL_FILE_NAME "null"
1098
1099 struct dentry *selinux_null = NULL;
1100
1101 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1102 size_t count, loff_t *ppos)
1103 {
1104 char tmpbuf[TMPBUFLEN];
1105 ssize_t length;
1106
1107 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1108 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1109 }
1110
1111 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1112 const char __user * buf,
1113 size_t count, loff_t *ppos)
1114
1115 {
1116 char *page;
1117 ssize_t ret;
1118 int new_value;
1119
1120 if (count >= PAGE_SIZE) {
1121 ret = -ENOMEM;
1122 goto out;
1123 }
1124
1125 if (*ppos != 0) {
1126 /* No partial writes. */
1127 ret = -EINVAL;
1128 goto out;
1129 }
1130
1131 page = (char*)get_zeroed_page(GFP_KERNEL);
1132 if (!page) {
1133 ret = -ENOMEM;
1134 goto out;
1135 }
1136
1137 if (copy_from_user(page, buf, count)) {
1138 ret = -EFAULT;
1139 goto out_free;
1140 }
1141
1142 if (sscanf(page, "%u", &new_value) != 1) {
1143 ret = -EINVAL;
1144 goto out;
1145 }
1146
1147 if (new_value != avc_cache_threshold) {
1148 ret = task_has_security(current, SECURITY__SETSECPARAM);
1149 if (ret)
1150 goto out_free;
1151 avc_cache_threshold = new_value;
1152 }
1153 ret = count;
1154 out_free:
1155 free_page((unsigned long)page);
1156 out:
1157 return ret;
1158 }
1159
1160 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1161 size_t count, loff_t *ppos)
1162 {
1163 char *page;
1164 ssize_t ret = 0;
1165
1166 page = (char *)__get_free_page(GFP_KERNEL);
1167 if (!page) {
1168 ret = -ENOMEM;
1169 goto out;
1170 }
1171 ret = avc_get_hash_stats(page);
1172 if (ret >= 0)
1173 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1174 free_page((unsigned long)page);
1175 out:
1176 return ret;
1177 }
1178
1179 static const struct file_operations sel_avc_cache_threshold_ops = {
1180 .read = sel_read_avc_cache_threshold,
1181 .write = sel_write_avc_cache_threshold,
1182 };
1183
1184 static const struct file_operations sel_avc_hash_stats_ops = {
1185 .read = sel_read_avc_hash_stats,
1186 };
1187
1188 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1189 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1190 {
1191 int cpu;
1192
1193 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1194 if (!cpu_possible(cpu))
1195 continue;
1196 *idx = cpu + 1;
1197 return &per_cpu(avc_cache_stats, cpu);
1198 }
1199 return NULL;
1200 }
1201
1202 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1203 {
1204 loff_t n = *pos - 1;
1205
1206 if (*pos == 0)
1207 return SEQ_START_TOKEN;
1208
1209 return sel_avc_get_stat_idx(&n);
1210 }
1211
1212 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1213 {
1214 return sel_avc_get_stat_idx(pos);
1215 }
1216
1217 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1218 {
1219 struct avc_cache_stats *st = v;
1220
1221 if (v == SEQ_START_TOKEN)
1222 seq_printf(seq, "lookups hits misses allocations reclaims "
1223 "frees\n");
1224 else
1225 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1226 st->hits, st->misses, st->allocations,
1227 st->reclaims, st->frees);
1228 return 0;
1229 }
1230
1231 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1232 { }
1233
1234 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1235 .start = sel_avc_stats_seq_start,
1236 .next = sel_avc_stats_seq_next,
1237 .show = sel_avc_stats_seq_show,
1238 .stop = sel_avc_stats_seq_stop,
1239 };
1240
1241 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1242 {
1243 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1244 }
1245
1246 static const struct file_operations sel_avc_cache_stats_ops = {
1247 .open = sel_open_avc_cache_stats,
1248 .read = seq_read,
1249 .llseek = seq_lseek,
1250 .release = seq_release,
1251 };
1252 #endif
1253
1254 static int sel_make_avc_files(struct dentry *dir)
1255 {
1256 int i, ret = 0;
1257 static struct tree_descr files[] = {
1258 { "cache_threshold",
1259 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1260 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1261 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1262 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1263 #endif
1264 };
1265
1266 for (i = 0; i < ARRAY_SIZE(files); i++) {
1267 struct inode *inode;
1268 struct dentry *dentry;
1269
1270 dentry = d_alloc_name(dir, files[i].name);
1271 if (!dentry) {
1272 ret = -ENOMEM;
1273 goto out;
1274 }
1275
1276 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1277 if (!inode) {
1278 ret = -ENOMEM;
1279 goto out;
1280 }
1281 inode->i_fop = files[i].ops;
1282 inode->i_ino = ++sel_last_ino;
1283 d_add(dentry, inode);
1284 }
1285 out:
1286 return ret;
1287 }
1288
1289 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1290 size_t count, loff_t *ppos)
1291 {
1292 struct inode *inode;
1293 char *con;
1294 u32 sid, len;
1295 ssize_t ret;
1296
1297 inode = file->f_path.dentry->d_inode;
1298 sid = inode->i_ino&SEL_INO_MASK;
1299 ret = security_sid_to_context(sid, &con, &len);
1300 if (ret < 0)
1301 return ret;
1302
1303 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1304 kfree(con);
1305 return ret;
1306 }
1307
1308 static const struct file_operations sel_initcon_ops = {
1309 .read = sel_read_initcon,
1310 };
1311
1312 static int sel_make_initcon_files(struct dentry *dir)
1313 {
1314 int i, ret = 0;
1315
1316 for (i = 1; i <= SECINITSID_NUM; i++) {
1317 struct inode *inode;
1318 struct dentry *dentry;
1319 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1320 if (!dentry) {
1321 ret = -ENOMEM;
1322 goto out;
1323 }
1324
1325 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1326 if (!inode) {
1327 ret = -ENOMEM;
1328 goto out;
1329 }
1330 inode->i_fop = &sel_initcon_ops;
1331 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1332 d_add(dentry, inode);
1333 }
1334 out:
1335 return ret;
1336 }
1337
1338 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1339 {
1340 return a / b - (a % b < 0);
1341 }
1342
1343 static inline unsigned long sel_class_to_ino(u16 class)
1344 {
1345 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1346 }
1347
1348 static inline u16 sel_ino_to_class(unsigned long ino)
1349 {
1350 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1351 }
1352
1353 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1354 {
1355 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1356 }
1357
1358 static inline u32 sel_ino_to_perm(unsigned long ino)
1359 {
1360 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1361 }
1362
1363 static ssize_t sel_read_class(struct file * file, char __user *buf,
1364 size_t count, loff_t *ppos)
1365 {
1366 ssize_t rc, len;
1367 char *page;
1368 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1369
1370 page = (char *)__get_free_page(GFP_KERNEL);
1371 if (!page) {
1372 rc = -ENOMEM;
1373 goto out;
1374 }
1375
1376 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1377 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1378 free_page((unsigned long)page);
1379 out:
1380 return rc;
1381 }
1382
1383 static const struct file_operations sel_class_ops = {
1384 .read = sel_read_class,
1385 };
1386
1387 static ssize_t sel_read_perm(struct file * file, char __user *buf,
1388 size_t count, loff_t *ppos)
1389 {
1390 ssize_t rc, len;
1391 char *page;
1392 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1393
1394 page = (char *)__get_free_page(GFP_KERNEL);
1395 if (!page) {
1396 rc = -ENOMEM;
1397 goto out;
1398 }
1399
1400 len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino));
1401 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1402 free_page((unsigned long)page);
1403 out:
1404 return rc;
1405 }
1406
1407 static const struct file_operations sel_perm_ops = {
1408 .read = sel_read_perm,
1409 };
1410
1411 static int sel_make_perm_files(char *objclass, int classvalue,
1412 struct dentry *dir)
1413 {
1414 int i, rc = 0, nperms;
1415 char **perms;
1416
1417 rc = security_get_permissions(objclass, &perms, &nperms);
1418 if (rc)
1419 goto out;
1420
1421 for (i = 0; i < nperms; i++) {
1422 struct inode *inode;
1423 struct dentry *dentry;
1424
1425 dentry = d_alloc_name(dir, perms[i]);
1426 if (!dentry) {
1427 rc = -ENOMEM;
1428 goto out1;
1429 }
1430
1431 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1432 if (!inode) {
1433 rc = -ENOMEM;
1434 goto out1;
1435 }
1436 inode->i_fop = &sel_perm_ops;
1437 /* i+1 since perm values are 1-indexed */
1438 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1439 d_add(dentry, inode);
1440 }
1441
1442 out1:
1443 for (i = 0; i < nperms; i++)
1444 kfree(perms[i]);
1445 kfree(perms);
1446 out:
1447 return rc;
1448 }
1449
1450 static int sel_make_class_dir_entries(char *classname, int index,
1451 struct dentry *dir)
1452 {
1453 struct dentry *dentry = NULL;
1454 struct inode *inode = NULL;
1455 int rc;
1456
1457 dentry = d_alloc_name(dir, "index");
1458 if (!dentry) {
1459 rc = -ENOMEM;
1460 goto out;
1461 }
1462
1463 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1464 if (!inode) {
1465 rc = -ENOMEM;
1466 goto out;
1467 }
1468
1469 inode->i_fop = &sel_class_ops;
1470 inode->i_ino = sel_class_to_ino(index);
1471 d_add(dentry, inode);
1472
1473 dentry = d_alloc_name(dir, "perms");
1474 if (!dentry) {
1475 rc = -ENOMEM;
1476 goto out;
1477 }
1478
1479 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1480 if (rc)
1481 goto out;
1482
1483 rc = sel_make_perm_files(classname, index, dentry);
1484
1485 out:
1486 return rc;
1487 }
1488
1489 static void sel_remove_classes(void)
1490 {
1491 struct list_head *class_node;
1492
1493 list_for_each(class_node, &class_dir->d_subdirs) {
1494 struct dentry *class_subdir = list_entry(class_node,
1495 struct dentry, d_u.d_child);
1496 struct list_head *class_subdir_node;
1497
1498 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1499 struct dentry *d = list_entry(class_subdir_node,
1500 struct dentry, d_u.d_child);
1501
1502 if (d->d_inode)
1503 if (d->d_inode->i_mode & S_IFDIR)
1504 sel_remove_entries(d);
1505 }
1506
1507 sel_remove_entries(class_subdir);
1508 }
1509
1510 sel_remove_entries(class_dir);
1511 }
1512
1513 static int sel_make_classes(void)
1514 {
1515 int rc = 0, nclasses, i;
1516 char **classes;
1517
1518 /* delete any existing entries */
1519 sel_remove_classes();
1520
1521 rc = security_get_classes(&classes, &nclasses);
1522 if (rc < 0)
1523 goto out;
1524
1525 /* +2 since classes are 1-indexed */
1526 last_class_ino = sel_class_to_ino(nclasses+2);
1527
1528 for (i = 0; i < nclasses; i++) {
1529 struct dentry *class_name_dir;
1530
1531 class_name_dir = d_alloc_name(class_dir, classes[i]);
1532 if (!class_name_dir) {
1533 rc = -ENOMEM;
1534 goto out1;
1535 }
1536
1537 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1538 &last_class_ino);
1539 if (rc)
1540 goto out1;
1541
1542 /* i+1 since class values are 1-indexed */
1543 rc = sel_make_class_dir_entries(classes[i], i+1,
1544 class_name_dir);
1545 if (rc)
1546 goto out1;
1547 }
1548
1549 out1:
1550 for (i = 0; i < nclasses; i++)
1551 kfree(classes[i]);
1552 kfree(classes);
1553 out:
1554 return rc;
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_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1602 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1603 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1604 /* last one */ {""}
1605 };
1606 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1607 if (ret)
1608 goto err;
1609
1610 root_inode = sb->s_root->d_inode;
1611
1612 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1613 if (!dentry) {
1614 ret = -ENOMEM;
1615 goto err;
1616 }
1617
1618 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1619 if (ret)
1620 goto err;
1621
1622 bool_dir = dentry;
1623
1624 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1625 if (!dentry) {
1626 ret = -ENOMEM;
1627 goto err;
1628 }
1629
1630 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1631 if (!inode) {
1632 ret = -ENOMEM;
1633 goto err;
1634 }
1635 inode->i_ino = ++sel_last_ino;
1636 isec = (struct inode_security_struct*)inode->i_security;
1637 isec->sid = SECINITSID_DEVNULL;
1638 isec->sclass = SECCLASS_CHR_FILE;
1639 isec->initialized = 1;
1640
1641 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1642 d_add(dentry, inode);
1643 selinux_null = dentry;
1644
1645 dentry = d_alloc_name(sb->s_root, "avc");
1646 if (!dentry) {
1647 ret = -ENOMEM;
1648 goto err;
1649 }
1650
1651 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1652 if (ret)
1653 goto err;
1654
1655 ret = sel_make_avc_files(dentry);
1656 if (ret)
1657 goto err;
1658
1659 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1660 if (!dentry) {
1661 ret = -ENOMEM;
1662 goto err;
1663 }
1664
1665 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1666 if (ret)
1667 goto err;
1668
1669 ret = sel_make_initcon_files(dentry);
1670 if (ret)
1671 goto err;
1672
1673 dentry = d_alloc_name(sb->s_root, "class");
1674 if (!dentry) {
1675 ret = -ENOMEM;
1676 goto err;
1677 }
1678
1679 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1680 if (ret)
1681 goto err;
1682
1683 class_dir = dentry;
1684
1685 out:
1686 return ret;
1687 err:
1688 printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
1689 goto out;
1690 }
1691
1692 static int sel_get_sb(struct file_system_type *fs_type,
1693 int flags, const char *dev_name, void *data,
1694 struct vfsmount *mnt)
1695 {
1696 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1697 }
1698
1699 static struct file_system_type sel_fs_type = {
1700 .name = "selinuxfs",
1701 .get_sb = sel_get_sb,
1702 .kill_sb = kill_litter_super,
1703 };
1704
1705 struct vfsmount *selinuxfs_mount;
1706
1707 static int __init init_sel_fs(void)
1708 {
1709 int err;
1710
1711 if (!selinux_enabled)
1712 return 0;
1713 err = register_filesystem(&sel_fs_type);
1714 if (!err) {
1715 selinuxfs_mount = kern_mount(&sel_fs_type);
1716 if (IS_ERR(selinuxfs_mount)) {
1717 printk(KERN_ERR "selinuxfs: could not mount!\n");
1718 err = PTR_ERR(selinuxfs_mount);
1719 selinuxfs_mount = NULL;
1720 }
1721 }
1722 return err;
1723 }
1724
1725 __initcall(init_sel_fs);
1726
1727 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1728 void exit_sel_fs(void)
1729 {
1730 unregister_filesystem(&sel_fs_type);
1731 }
1732 #endif
Support for the Chinese Samsung S3C2440 based development boards