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2fa483f26113c1656d950e11579bda5c7903cf8c
[deliverable/linux.git] / security / selinux / selinuxfs.c
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 char **bool_pending_names;
69 static int *bool_pending_values = NULL;
70
71 /* global data for classes */
72 static struct dentry *class_dir = NULL;
73 static unsigned long last_class_ino;
74
75 extern void selnl_notify_setenforce(int val);
76
77 /* Check whether a task is allowed to use a security operation. */
78 static int task_has_security(struct task_struct *tsk,
79 u32 perms)
80 {
81 struct task_security_struct *tsec;
82
83 tsec = tsk->security;
84 if (!tsec)
85 return -EACCES;
86
87 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
88 SECCLASS_SECURITY, perms, NULL);
89 }
90
91 enum sel_inos {
92 SEL_ROOT_INO = 2,
93 SEL_LOAD, /* load policy */
94 SEL_ENFORCE, /* get or set enforcing status */
95 SEL_CONTEXT, /* validate context */
96 SEL_ACCESS, /* compute access decision */
97 SEL_CREATE, /* compute create labeling decision */
98 SEL_RELABEL, /* compute relabeling decision */
99 SEL_USER, /* compute reachable user contexts */
100 SEL_POLICYVERS, /* return policy version for this kernel */
101 SEL_COMMIT_BOOLS, /* commit new boolean values */
102 SEL_MLS, /* return if MLS policy is enabled */
103 SEL_DISABLE, /* disable SELinux until next reboot */
104 SEL_MEMBER, /* compute polyinstantiation membership decision */
105 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
106 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
107 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
108 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
109 SEL_INO_NEXT, /* The next inode number to use */
110 };
111
112 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
113
114 #define SEL_INITCON_INO_OFFSET 0x01000000
115 #define SEL_BOOL_INO_OFFSET 0x02000000
116 #define SEL_CLASS_INO_OFFSET 0x04000000
117 #define SEL_INO_MASK 0x00ffffff
118
119 #define TMPBUFLEN 12
120 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
121 size_t count, loff_t *ppos)
122 {
123 char tmpbuf[TMPBUFLEN];
124 ssize_t length;
125
126 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
127 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
128 }
129
130 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
131 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
132 size_t count, loff_t *ppos)
133
134 {
135 char *page;
136 ssize_t length;
137 int new_value;
138
139 if (count >= PAGE_SIZE)
140 return -ENOMEM;
141 if (*ppos != 0) {
142 /* No partial writes. */
143 return -EINVAL;
144 }
145 page = (char*)get_zeroed_page(GFP_KERNEL);
146 if (!page)
147 return -ENOMEM;
148 length = -EFAULT;
149 if (copy_from_user(page, buf, count))
150 goto out;
151
152 length = -EINVAL;
153 if (sscanf(page, "%d", &new_value) != 1)
154 goto out;
155
156 if (new_value != selinux_enforcing) {
157 length = task_has_security(current, SECURITY__SETENFORCE);
158 if (length)
159 goto out;
160 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
161 "enforcing=%d old_enforcing=%d auid=%u", new_value,
162 selinux_enforcing,
163 audit_get_loginuid(current->audit_context));
164 selinux_enforcing = new_value;
165 if (selinux_enforcing)
166 avc_ss_reset(0);
167 selnl_notify_setenforce(selinux_enforcing);
168 }
169 length = count;
170 out:
171 free_page((unsigned long) page);
172 return length;
173 }
174 #else
175 #define sel_write_enforce NULL
176 #endif
177
178 static const struct file_operations sel_enforce_ops = {
179 .read = sel_read_enforce,
180 .write = sel_write_enforce,
181 };
182
183 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
184 size_t count, loff_t *ppos)
185 {
186 char tmpbuf[TMPBUFLEN];
187 ssize_t length;
188 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
189 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
190 security_get_reject_unknown() : !security_get_allow_unknown();
191
192 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
193 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
194 }
195
196 static const struct file_operations sel_handle_unknown_ops = {
197 .read = sel_read_handle_unknown,
198 };
199
200 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
201 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
202 size_t count, loff_t *ppos)
203
204 {
205 char *page;
206 ssize_t length;
207 int new_value;
208 extern int selinux_disable(void);
209
210 if (count >= PAGE_SIZE)
211 return -ENOMEM;
212 if (*ppos != 0) {
213 /* No partial writes. */
214 return -EINVAL;
215 }
216 page = (char*)get_zeroed_page(GFP_KERNEL);
217 if (!page)
218 return -ENOMEM;
219 length = -EFAULT;
220 if (copy_from_user(page, buf, count))
221 goto out;
222
223 length = -EINVAL;
224 if (sscanf(page, "%d", &new_value) != 1)
225 goto out;
226
227 if (new_value) {
228 length = selinux_disable();
229 if (length < 0)
230 goto out;
231 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
232 "selinux=0 auid=%u",
233 audit_get_loginuid(current->audit_context));
234 }
235
236 length = count;
237 out:
238 free_page((unsigned long) page);
239 return length;
240 }
241 #else
242 #define sel_write_disable NULL
243 #endif
244
245 static const struct file_operations sel_disable_ops = {
246 .write = sel_write_disable,
247 };
248
249 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
250 size_t count, loff_t *ppos)
251 {
252 char tmpbuf[TMPBUFLEN];
253 ssize_t length;
254
255 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
256 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
257 }
258
259 static const struct file_operations sel_policyvers_ops = {
260 .read = sel_read_policyvers,
261 };
262
263 /* declaration for sel_write_load */
264 static int sel_make_bools(void);
265 static int sel_make_classes(void);
266
267 /* declaration for sel_make_class_dirs */
268 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
269 unsigned long *ino);
270
271 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
272 size_t count, loff_t *ppos)
273 {
274 char tmpbuf[TMPBUFLEN];
275 ssize_t length;
276
277 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
278 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
279 }
280
281 static const struct file_operations sel_mls_ops = {
282 .read = sel_read_mls,
283 };
284
285 static ssize_t sel_write_load(struct file * file, const char __user * buf,
286 size_t count, loff_t *ppos)
287
288 {
289 int ret;
290 ssize_t length;
291 void *data = NULL;
292
293 mutex_lock(&sel_mutex);
294
295 length = task_has_security(current, SECURITY__LOAD_POLICY);
296 if (length)
297 goto out;
298
299 if (*ppos != 0) {
300 /* No partial writes. */
301 length = -EINVAL;
302 goto out;
303 }
304
305 if ((count > 64 * 1024 * 1024)
306 || (data = vmalloc(count)) == NULL) {
307 length = -ENOMEM;
308 goto out;
309 }
310
311 length = -EFAULT;
312 if (copy_from_user(data, buf, count) != 0)
313 goto out;
314
315 length = security_load_policy(data, count);
316 if (length)
317 goto out;
318
319 ret = sel_make_bools();
320 if (ret) {
321 length = ret;
322 goto out1;
323 }
324
325 ret = sel_make_classes();
326 if (ret)
327 length = ret;
328 else
329 length = count;
330
331 out1:
332
333 printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
334 (security_get_reject_unknown() ? "reject" :
335 (security_get_allow_unknown() ? "allow" : "deny")));
336
337 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
338 "policy loaded auid=%u",
339 audit_get_loginuid(current->audit_context));
340 out:
341 mutex_unlock(&sel_mutex);
342 vfree(data);
343 return length;
344 }
345
346 static const struct file_operations sel_load_ops = {
347 .write = sel_write_load,
348 };
349
350 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
351 {
352 char *canon;
353 u32 sid, len;
354 ssize_t length;
355
356 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
357 if (length)
358 return length;
359
360 length = security_context_to_sid(buf, size, &sid);
361 if (length < 0)
362 return length;
363
364 length = security_sid_to_context(sid, &canon, &len);
365 if (length < 0)
366 return length;
367
368 if (len > SIMPLE_TRANSACTION_LIMIT) {
369 printk(KERN_ERR "%s: context size (%u) exceeds payload "
370 "max\n", __FUNCTION__, len);
371 length = -ERANGE;
372 goto out;
373 }
374
375 memcpy(buf, canon, len);
376 length = len;
377 out:
378 kfree(canon);
379 return length;
380 }
381
382 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
383 size_t count, loff_t *ppos)
384 {
385 char tmpbuf[TMPBUFLEN];
386 ssize_t length;
387
388 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
389 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
390 }
391
392 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
393 size_t count, loff_t *ppos)
394 {
395 char *page;
396 ssize_t length;
397 unsigned int new_value;
398
399 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
400 if (length)
401 return length;
402
403 if (count >= PAGE_SIZE)
404 return -ENOMEM;
405 if (*ppos != 0) {
406 /* No partial writes. */
407 return -EINVAL;
408 }
409 page = (char*)get_zeroed_page(GFP_KERNEL);
410 if (!page)
411 return -ENOMEM;
412 length = -EFAULT;
413 if (copy_from_user(page, buf, count))
414 goto out;
415
416 length = -EINVAL;
417 if (sscanf(page, "%u", &new_value) != 1)
418 goto out;
419
420 selinux_checkreqprot = new_value ? 1 : 0;
421 length = count;
422 out:
423 free_page((unsigned long) page);
424 return length;
425 }
426 static const struct file_operations sel_checkreqprot_ops = {
427 .read = sel_read_checkreqprot,
428 .write = sel_write_checkreqprot,
429 };
430
431 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
432 size_t count, loff_t *ppos)
433 {
434 char tmpbuf[TMPBUFLEN];
435 ssize_t length;
436
437 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
438 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
439 }
440
441 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
442 size_t count, loff_t *ppos)
443 {
444 char *page;
445 ssize_t length;
446 int new_value;
447
448 length = task_has_security(current, SECURITY__LOAD_POLICY);
449 if (length)
450 return length;
451
452 if (count >= PAGE_SIZE)
453 return -ENOMEM;
454 if (*ppos != 0) {
455 /* No partial writes. */
456 return -EINVAL;
457 }
458 page = (char*)get_zeroed_page(GFP_KERNEL);
459 if (!page)
460 return -ENOMEM;
461 length = -EFAULT;
462 if (copy_from_user(page, buf, count))
463 goto out;
464
465 length = -EINVAL;
466 if (sscanf(page, "%d", &new_value) != 1)
467 goto out;
468
469 selinux_compat_net = new_value ? 1 : 0;
470 length = count;
471 out:
472 free_page((unsigned long) page);
473 return length;
474 }
475 static const struct file_operations sel_compat_net_ops = {
476 .read = sel_read_compat_net,
477 .write = sel_write_compat_net,
478 };
479
480 /*
481 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
482 */
483 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
484 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
485 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
486 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
487 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
488
489 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
490 [SEL_ACCESS] = sel_write_access,
491 [SEL_CREATE] = sel_write_create,
492 [SEL_RELABEL] = sel_write_relabel,
493 [SEL_USER] = sel_write_user,
494 [SEL_MEMBER] = sel_write_member,
495 [SEL_CONTEXT] = sel_write_context,
496 };
497
498 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
499 {
500 ino_t ino = file->f_path.dentry->d_inode->i_ino;
501 char *data;
502 ssize_t rv;
503
504 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
505 return -EINVAL;
506
507 data = simple_transaction_get(file, buf, size);
508 if (IS_ERR(data))
509 return PTR_ERR(data);
510
511 rv = write_op[ino](file, data, size);
512 if (rv>0) {
513 simple_transaction_set(file, rv);
514 rv = size;
515 }
516 return rv;
517 }
518
519 static const struct file_operations transaction_ops = {
520 .write = selinux_transaction_write,
521 .read = simple_transaction_read,
522 .release = simple_transaction_release,
523 };
524
525 /*
526 * payload - write methods
527 * If the method has a response, the response should be put in buf,
528 * and the length returned. Otherwise return 0 or and -error.
529 */
530
531 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
532 {
533 char *scon, *tcon;
534 u32 ssid, tsid;
535 u16 tclass;
536 u32 req;
537 struct av_decision avd;
538 ssize_t length;
539
540 length = task_has_security(current, SECURITY__COMPUTE_AV);
541 if (length)
542 return length;
543
544 length = -ENOMEM;
545 scon = kzalloc(size+1, GFP_KERNEL);
546 if (!scon)
547 return length;
548
549 tcon = kzalloc(size+1, GFP_KERNEL);
550 if (!tcon)
551 goto out;
552
553 length = -EINVAL;
554 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
555 goto out2;
556
557 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
558 if (length < 0)
559 goto out2;
560 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
561 if (length < 0)
562 goto out2;
563
564 length = security_compute_av(ssid, tsid, tclass, req, &avd);
565 if (length < 0)
566 goto out2;
567
568 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
569 "%x %x %x %x %u",
570 avd.allowed, avd.decided,
571 avd.auditallow, avd.auditdeny,
572 avd.seqno);
573 out2:
574 kfree(tcon);
575 out:
576 kfree(scon);
577 return length;
578 }
579
580 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
581 {
582 char *scon, *tcon;
583 u32 ssid, tsid, newsid;
584 u16 tclass;
585 ssize_t length;
586 char *newcon;
587 u32 len;
588
589 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
590 if (length)
591 return length;
592
593 length = -ENOMEM;
594 scon = kzalloc(size+1, GFP_KERNEL);
595 if (!scon)
596 return length;
597
598 tcon = kzalloc(size+1, GFP_KERNEL);
599 if (!tcon)
600 goto out;
601
602 length = -EINVAL;
603 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
604 goto out2;
605
606 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
607 if (length < 0)
608 goto out2;
609 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
610 if (length < 0)
611 goto out2;
612
613 length = security_transition_sid(ssid, tsid, tclass, &newsid);
614 if (length < 0)
615 goto out2;
616
617 length = security_sid_to_context(newsid, &newcon, &len);
618 if (length < 0)
619 goto out2;
620
621 if (len > SIMPLE_TRANSACTION_LIMIT) {
622 printk(KERN_ERR "%s: context size (%u) exceeds payload "
623 "max\n", __FUNCTION__, len);
624 length = -ERANGE;
625 goto out3;
626 }
627
628 memcpy(buf, newcon, len);
629 length = len;
630 out3:
631 kfree(newcon);
632 out2:
633 kfree(tcon);
634 out:
635 kfree(scon);
636 return length;
637 }
638
639 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
640 {
641 char *scon, *tcon;
642 u32 ssid, tsid, newsid;
643 u16 tclass;
644 ssize_t length;
645 char *newcon;
646 u32 len;
647
648 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
649 if (length)
650 return length;
651
652 length = -ENOMEM;
653 scon = kzalloc(size+1, GFP_KERNEL);
654 if (!scon)
655 return length;
656
657 tcon = kzalloc(size+1, GFP_KERNEL);
658 if (!tcon)
659 goto out;
660
661 length = -EINVAL;
662 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
663 goto out2;
664
665 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
666 if (length < 0)
667 goto out2;
668 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
669 if (length < 0)
670 goto out2;
671
672 length = security_change_sid(ssid, tsid, tclass, &newsid);
673 if (length < 0)
674 goto out2;
675
676 length = security_sid_to_context(newsid, &newcon, &len);
677 if (length < 0)
678 goto out2;
679
680 if (len > SIMPLE_TRANSACTION_LIMIT) {
681 length = -ERANGE;
682 goto out3;
683 }
684
685 memcpy(buf, newcon, len);
686 length = len;
687 out3:
688 kfree(newcon);
689 out2:
690 kfree(tcon);
691 out:
692 kfree(scon);
693 return length;
694 }
695
696 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
697 {
698 char *con, *user, *ptr;
699 u32 sid, *sids;
700 ssize_t length;
701 char *newcon;
702 int i, rc;
703 u32 len, nsids;
704
705 length = task_has_security(current, SECURITY__COMPUTE_USER);
706 if (length)
707 return length;
708
709 length = -ENOMEM;
710 con = kzalloc(size+1, GFP_KERNEL);
711 if (!con)
712 return length;
713
714 user = kzalloc(size+1, GFP_KERNEL);
715 if (!user)
716 goto out;
717
718 length = -EINVAL;
719 if (sscanf(buf, "%s %s", con, user) != 2)
720 goto out2;
721
722 length = security_context_to_sid(con, strlen(con)+1, &sid);
723 if (length < 0)
724 goto out2;
725
726 length = security_get_user_sids(sid, user, &sids, &nsids);
727 if (length < 0)
728 goto out2;
729
730 length = sprintf(buf, "%u", nsids) + 1;
731 ptr = buf + length;
732 for (i = 0; i < nsids; i++) {
733 rc = security_sid_to_context(sids[i], &newcon, &len);
734 if (rc) {
735 length = rc;
736 goto out3;
737 }
738 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
739 kfree(newcon);
740 length = -ERANGE;
741 goto out3;
742 }
743 memcpy(ptr, newcon, len);
744 kfree(newcon);
745 ptr += len;
746 length += len;
747 }
748 out3:
749 kfree(sids);
750 out2:
751 kfree(user);
752 out:
753 kfree(con);
754 return length;
755 }
756
757 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
758 {
759 char *scon, *tcon;
760 u32 ssid, tsid, newsid;
761 u16 tclass;
762 ssize_t length;
763 char *newcon;
764 u32 len;
765
766 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
767 if (length)
768 return length;
769
770 length = -ENOMEM;
771 scon = kzalloc(size+1, GFP_KERNEL);
772 if (!scon)
773 return length;
774
775 tcon = kzalloc(size+1, GFP_KERNEL);
776 if (!tcon)
777 goto out;
778
779 length = -EINVAL;
780 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
781 goto out2;
782
783 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
784 if (length < 0)
785 goto out2;
786 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
787 if (length < 0)
788 goto out2;
789
790 length = security_member_sid(ssid, tsid, tclass, &newsid);
791 if (length < 0)
792 goto out2;
793
794 length = security_sid_to_context(newsid, &newcon, &len);
795 if (length < 0)
796 goto out2;
797
798 if (len > SIMPLE_TRANSACTION_LIMIT) {
799 printk(KERN_ERR "%s: context size (%u) exceeds payload "
800 "max\n", __FUNCTION__, len);
801 length = -ERANGE;
802 goto out3;
803 }
804
805 memcpy(buf, newcon, len);
806 length = len;
807 out3:
808 kfree(newcon);
809 out2:
810 kfree(tcon);
811 out:
812 kfree(scon);
813 return length;
814 }
815
816 static struct inode *sel_make_inode(struct super_block *sb, int mode)
817 {
818 struct inode *ret = new_inode(sb);
819
820 if (ret) {
821 ret->i_mode = mode;
822 ret->i_uid = ret->i_gid = 0;
823 ret->i_blocks = 0;
824 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
825 }
826 return ret;
827 }
828
829 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
830 size_t count, loff_t *ppos)
831 {
832 char *page = NULL;
833 ssize_t length;
834 ssize_t ret;
835 int cur_enforcing;
836 struct inode *inode = filep->f_path.dentry->d_inode;
837 unsigned index = inode->i_ino & SEL_INO_MASK;
838 const char *name = filep->f_path.dentry->d_name.name;
839
840 mutex_lock(&sel_mutex);
841
842 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
843 ret = -EINVAL;
844 goto out;
845 }
846
847 if (count > PAGE_SIZE) {
848 ret = -EINVAL;
849 goto out;
850 }
851 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
852 ret = -ENOMEM;
853 goto out;
854 }
855
856 cur_enforcing = security_get_bool_value(index);
857 if (cur_enforcing < 0) {
858 ret = cur_enforcing;
859 goto out;
860 }
861 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
862 bool_pending_values[index]);
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;
876 int new_value;
877 struct inode *inode = filep->f_path.dentry->d_inode;
878 unsigned index = inode->i_ino & SEL_INO_MASK;
879 const char *name = filep->f_path.dentry->d_name.name;
880
881 mutex_lock(&sel_mutex);
882
883 length = task_has_security(current, SECURITY__SETBOOL);
884 if (length)
885 goto out;
886
887 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
888 length = -EINVAL;
889 goto out;
890 }
891
892 if (count >= PAGE_SIZE) {
893 length = -ENOMEM;
894 goto out;
895 }
896
897 if (*ppos != 0) {
898 /* No partial writes. */
899 length = -EINVAL;
900 goto out;
901 }
902 page = (char*)get_zeroed_page(GFP_KERNEL);
903 if (!page) {
904 length = -ENOMEM;
905 goto out;
906 }
907
908 length = -EFAULT;
909 if (copy_from_user(page, buf, count))
910 goto out;
911
912 length = -EINVAL;
913 if (sscanf(page, "%d", &new_value) != 1)
914 goto out;
915
916 if (new_value)
917 new_value = 1;
918
919 bool_pending_values[index] = new_value;
920 length = count;
921
922 out:
923 mutex_unlock(&sel_mutex);
924 if (page)
925 free_page((unsigned long) page);
926 return length;
927 }
928
929 static const struct file_operations sel_bool_ops = {
930 .read = sel_read_bool,
931 .write = sel_write_bool,
932 };
933
934 static ssize_t sel_commit_bools_write(struct file *filep,
935 const char __user *buf,
936 size_t count, loff_t *ppos)
937 {
938 char *page = NULL;
939 ssize_t length;
940 int new_value;
941
942 mutex_lock(&sel_mutex);
943
944 length = task_has_security(current, SECURITY__SETBOOL);
945 if (length)
946 goto out;
947
948 if (count >= PAGE_SIZE) {
949 length = -ENOMEM;
950 goto out;
951 }
952 if (*ppos != 0) {
953 /* No partial writes. */
954 goto out;
955 }
956 page = (char*)get_zeroed_page(GFP_KERNEL);
957 if (!page) {
958 length = -ENOMEM;
959 goto out;
960 }
961
962 length = -EFAULT;
963 if (copy_from_user(page, buf, count))
964 goto out;
965
966 length = -EINVAL;
967 if (sscanf(page, "%d", &new_value) != 1)
968 goto out;
969
970 if (new_value && bool_pending_values) {
971 security_set_bools(bool_num, bool_pending_values);
972 }
973
974 length = count;
975
976 out:
977 mutex_unlock(&sel_mutex);
978 if (page)
979 free_page((unsigned long) page);
980 return length;
981 }
982
983 static const struct file_operations sel_commit_bools_ops = {
984 .write = sel_commit_bools_write,
985 };
986
987 static void sel_remove_entries(struct dentry *de)
988 {
989 struct list_head *node;
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
1011 #define BOOL_DIR_NAME "booleans"
1012
1013 static int sel_make_bools(void)
1014 {
1015 int i, ret = 0;
1016 ssize_t len;
1017 struct dentry *dentry = NULL;
1018 struct dentry *dir = bool_dir;
1019 struct inode *inode = NULL;
1020 struct inode_security_struct *isec;
1021 char **names = NULL, *page;
1022 int num;
1023 int *values = NULL;
1024 u32 sid;
1025
1026 /* remove any existing files */
1027 kfree(bool_pending_names);
1028 kfree(bool_pending_values);
1029 bool_pending_names = NULL;
1030 bool_pending_values = NULL;
1031
1032 sel_remove_entries(dir);
1033
1034 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1035 return -ENOMEM;
1036
1037 ret = security_get_bools(&num, &names, &values);
1038 if (ret != 0)
1039 goto out;
1040
1041 for (i = 0; i < num; i++) {
1042 dentry = d_alloc_name(dir, names[i]);
1043 if (!dentry) {
1044 ret = -ENOMEM;
1045 goto err;
1046 }
1047 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1048 if (!inode) {
1049 ret = -ENOMEM;
1050 goto err;
1051 }
1052
1053 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1054 if (len < 0) {
1055 ret = -EINVAL;
1056 goto err;
1057 } else if (len >= PAGE_SIZE) {
1058 ret = -ENAMETOOLONG;
1059 goto err;
1060 }
1061 isec = (struct inode_security_struct*)inode->i_security;
1062 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1063 goto err;
1064 isec->sid = sid;
1065 isec->initialized = 1;
1066 inode->i_fop = &sel_bool_ops;
1067 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1068 d_add(dentry, inode);
1069 }
1070 bool_num = num;
1071 bool_pending_names = names;
1072 bool_pending_values = values;
1073 out:
1074 free_page((unsigned long)page);
1075 return ret;
1076 err:
1077 if (names) {
1078 for (i = 0; i < num; i++)
1079 kfree(names[i]);
1080 kfree(names);
1081 }
1082 kfree(values);
1083 sel_remove_entries(dir);
1084 ret = -ENOMEM;
1085 goto out;
1086 }
1087
1088 #define NULL_FILE_NAME "null"
1089
1090 struct dentry *selinux_null = NULL;
1091
1092 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1093 size_t count, loff_t *ppos)
1094 {
1095 char tmpbuf[TMPBUFLEN];
1096 ssize_t length;
1097
1098 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1099 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1100 }
1101
1102 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1103 const char __user * buf,
1104 size_t count, loff_t *ppos)
1105
1106 {
1107 char *page;
1108 ssize_t ret;
1109 int new_value;
1110
1111 if (count >= PAGE_SIZE) {
1112 ret = -ENOMEM;
1113 goto out;
1114 }
1115
1116 if (*ppos != 0) {
1117 /* No partial writes. */
1118 ret = -EINVAL;
1119 goto out;
1120 }
1121
1122 page = (char*)get_zeroed_page(GFP_KERNEL);
1123 if (!page) {
1124 ret = -ENOMEM;
1125 goto out;
1126 }
1127
1128 if (copy_from_user(page, buf, count)) {
1129 ret = -EFAULT;
1130 goto out_free;
1131 }
1132
1133 if (sscanf(page, "%u", &new_value) != 1) {
1134 ret = -EINVAL;
1135 goto out;
1136 }
1137
1138 if (new_value != avc_cache_threshold) {
1139 ret = task_has_security(current, SECURITY__SETSECPARAM);
1140 if (ret)
1141 goto out_free;
1142 avc_cache_threshold = new_value;
1143 }
1144 ret = count;
1145 out_free:
1146 free_page((unsigned long)page);
1147 out:
1148 return ret;
1149 }
1150
1151 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1152 size_t count, loff_t *ppos)
1153 {
1154 char *page;
1155 ssize_t ret = 0;
1156
1157 page = (char *)__get_free_page(GFP_KERNEL);
1158 if (!page) {
1159 ret = -ENOMEM;
1160 goto out;
1161 }
1162 ret = avc_get_hash_stats(page);
1163 if (ret >= 0)
1164 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1165 free_page((unsigned long)page);
1166 out:
1167 return ret;
1168 }
1169
1170 static const struct file_operations sel_avc_cache_threshold_ops = {
1171 .read = sel_read_avc_cache_threshold,
1172 .write = sel_write_avc_cache_threshold,
1173 };
1174
1175 static const struct file_operations sel_avc_hash_stats_ops = {
1176 .read = sel_read_avc_hash_stats,
1177 };
1178
1179 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1180 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1181 {
1182 int cpu;
1183
1184 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1185 if (!cpu_possible(cpu))
1186 continue;
1187 *idx = cpu + 1;
1188 return &per_cpu(avc_cache_stats, cpu);
1189 }
1190 return NULL;
1191 }
1192
1193 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1194 {
1195 loff_t n = *pos - 1;
1196
1197 if (*pos == 0)
1198 return SEQ_START_TOKEN;
1199
1200 return sel_avc_get_stat_idx(&n);
1201 }
1202
1203 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1204 {
1205 return sel_avc_get_stat_idx(pos);
1206 }
1207
1208 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1209 {
1210 struct avc_cache_stats *st = v;
1211
1212 if (v == SEQ_START_TOKEN)
1213 seq_printf(seq, "lookups hits misses allocations reclaims "
1214 "frees\n");
1215 else
1216 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1217 st->hits, st->misses, st->allocations,
1218 st->reclaims, st->frees);
1219 return 0;
1220 }
1221
1222 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1223 { }
1224
1225 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1226 .start = sel_avc_stats_seq_start,
1227 .next = sel_avc_stats_seq_next,
1228 .show = sel_avc_stats_seq_show,
1229 .stop = sel_avc_stats_seq_stop,
1230 };
1231
1232 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1233 {
1234 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1235 }
1236
1237 static const struct file_operations sel_avc_cache_stats_ops = {
1238 .open = sel_open_avc_cache_stats,
1239 .read = seq_read,
1240 .llseek = seq_lseek,
1241 .release = seq_release,
1242 };
1243 #endif
1244
1245 static int sel_make_avc_files(struct dentry *dir)
1246 {
1247 int i, ret = 0;
1248 static struct tree_descr files[] = {
1249 { "cache_threshold",
1250 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1251 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1252 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1253 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1254 #endif
1255 };
1256
1257 for (i = 0; i < ARRAY_SIZE(files); i++) {
1258 struct inode *inode;
1259 struct dentry *dentry;
1260
1261 dentry = d_alloc_name(dir, files[i].name);
1262 if (!dentry) {
1263 ret = -ENOMEM;
1264 goto out;
1265 }
1266
1267 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1268 if (!inode) {
1269 ret = -ENOMEM;
1270 goto out;
1271 }
1272 inode->i_fop = files[i].ops;
1273 inode->i_ino = ++sel_last_ino;
1274 d_add(dentry, inode);
1275 }
1276 out:
1277 return ret;
1278 }
1279
1280 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1281 size_t count, loff_t *ppos)
1282 {
1283 struct inode *inode;
1284 char *con;
1285 u32 sid, len;
1286 ssize_t ret;
1287
1288 inode = file->f_path.dentry->d_inode;
1289 sid = inode->i_ino&SEL_INO_MASK;
1290 ret = security_sid_to_context(sid, &con, &len);
1291 if (ret < 0)
1292 return ret;
1293
1294 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1295 kfree(con);
1296 return ret;
1297 }
1298
1299 static const struct file_operations sel_initcon_ops = {
1300 .read = sel_read_initcon,
1301 };
1302
1303 static int sel_make_initcon_files(struct dentry *dir)
1304 {
1305 int i, ret = 0;
1306
1307 for (i = 1; i <= SECINITSID_NUM; i++) {
1308 struct inode *inode;
1309 struct dentry *dentry;
1310 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1311 if (!dentry) {
1312 ret = -ENOMEM;
1313 goto out;
1314 }
1315
1316 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1317 if (!inode) {
1318 ret = -ENOMEM;
1319 goto out;
1320 }
1321 inode->i_fop = &sel_initcon_ops;
1322 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1323 d_add(dentry, inode);
1324 }
1325 out:
1326 return ret;
1327 }
1328
1329 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1330 {
1331 return a / b - (a % b < 0);
1332 }
1333
1334 static inline unsigned long sel_class_to_ino(u16 class)
1335 {
1336 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1337 }
1338
1339 static inline u16 sel_ino_to_class(unsigned long ino)
1340 {
1341 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1342 }
1343
1344 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1345 {
1346 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1347 }
1348
1349 static inline u32 sel_ino_to_perm(unsigned long ino)
1350 {
1351 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1352 }
1353
1354 static ssize_t sel_read_class(struct file * file, char __user *buf,
1355 size_t count, loff_t *ppos)
1356 {
1357 ssize_t rc, len;
1358 char *page;
1359 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1360
1361 page = (char *)__get_free_page(GFP_KERNEL);
1362 if (!page) {
1363 rc = -ENOMEM;
1364 goto out;
1365 }
1366
1367 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1368 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1369 free_page((unsigned long)page);
1370 out:
1371 return rc;
1372 }
1373
1374 static const struct file_operations sel_class_ops = {
1375 .read = sel_read_class,
1376 };
1377
1378 static ssize_t sel_read_perm(struct file * file, char __user *buf,
1379 size_t count, loff_t *ppos)
1380 {
1381 ssize_t rc, len;
1382 char *page;
1383 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1384
1385 page = (char *)__get_free_page(GFP_KERNEL);
1386 if (!page) {
1387 rc = -ENOMEM;
1388 goto out;
1389 }
1390
1391 len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino));
1392 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1393 free_page((unsigned long)page);
1394 out:
1395 return rc;
1396 }
1397
1398 static const struct file_operations sel_perm_ops = {
1399 .read = sel_read_perm,
1400 };
1401
1402 static int sel_make_perm_files(char *objclass, int classvalue,
1403 struct dentry *dir)
1404 {
1405 int i, rc = 0, nperms;
1406 char **perms;
1407
1408 rc = security_get_permissions(objclass, &perms, &nperms);
1409 if (rc)
1410 goto out;
1411
1412 for (i = 0; i < nperms; i++) {
1413 struct inode *inode;
1414 struct dentry *dentry;
1415
1416 dentry = d_alloc_name(dir, perms[i]);
1417 if (!dentry) {
1418 rc = -ENOMEM;
1419 goto out1;
1420 }
1421
1422 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1423 if (!inode) {
1424 rc = -ENOMEM;
1425 goto out1;
1426 }
1427 inode->i_fop = &sel_perm_ops;
1428 /* i+1 since perm values are 1-indexed */
1429 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1430 d_add(dentry, inode);
1431 }
1432
1433 out1:
1434 for (i = 0; i < nperms; i++)
1435 kfree(perms[i]);
1436 kfree(perms);
1437 out:
1438 return rc;
1439 }
1440
1441 static int sel_make_class_dir_entries(char *classname, int index,
1442 struct dentry *dir)
1443 {
1444 struct dentry *dentry = NULL;
1445 struct inode *inode = NULL;
1446 int rc;
1447
1448 dentry = d_alloc_name(dir, "index");
1449 if (!dentry) {
1450 rc = -ENOMEM;
1451 goto out;
1452 }
1453
1454 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1455 if (!inode) {
1456 rc = -ENOMEM;
1457 goto out;
1458 }
1459
1460 inode->i_fop = &sel_class_ops;
1461 inode->i_ino = sel_class_to_ino(index);
1462 d_add(dentry, inode);
1463
1464 dentry = d_alloc_name(dir, "perms");
1465 if (!dentry) {
1466 rc = -ENOMEM;
1467 goto out;
1468 }
1469
1470 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1471 if (rc)
1472 goto out;
1473
1474 rc = sel_make_perm_files(classname, index, dentry);
1475
1476 out:
1477 return rc;
1478 }
1479
1480 static void sel_remove_classes(void)
1481 {
1482 struct list_head *class_node;
1483
1484 list_for_each(class_node, &class_dir->d_subdirs) {
1485 struct dentry *class_subdir = list_entry(class_node,
1486 struct dentry, d_u.d_child);
1487 struct list_head *class_subdir_node;
1488
1489 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1490 struct dentry *d = list_entry(class_subdir_node,
1491 struct dentry, d_u.d_child);
1492
1493 if (d->d_inode)
1494 if (d->d_inode->i_mode & S_IFDIR)
1495 sel_remove_entries(d);
1496 }
1497
1498 sel_remove_entries(class_subdir);
1499 }
1500
1501 sel_remove_entries(class_dir);
1502 }
1503
1504 static int sel_make_classes(void)
1505 {
1506 int rc = 0, nclasses, i;
1507 char **classes;
1508
1509 /* delete any existing entries */
1510 sel_remove_classes();
1511
1512 rc = security_get_classes(&classes, &nclasses);
1513 if (rc < 0)
1514 goto out;
1515
1516 /* +2 since classes are 1-indexed */
1517 last_class_ino = sel_class_to_ino(nclasses+2);
1518
1519 for (i = 0; i < nclasses; i++) {
1520 struct dentry *class_name_dir;
1521
1522 class_name_dir = d_alloc_name(class_dir, classes[i]);
1523 if (!class_name_dir) {
1524 rc = -ENOMEM;
1525 goto out1;
1526 }
1527
1528 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1529 &last_class_ino);
1530 if (rc)
1531 goto out1;
1532
1533 /* i+1 since class values are 1-indexed */
1534 rc = sel_make_class_dir_entries(classes[i], i+1,
1535 class_name_dir);
1536 if (rc)
1537 goto out1;
1538 }
1539
1540 out1:
1541 for (i = 0; i < nclasses; i++)
1542 kfree(classes[i]);
1543 kfree(classes);
1544 out:
1545 return rc;
1546 }
1547
1548 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1549 unsigned long *ino)
1550 {
1551 int ret = 0;
1552 struct inode *inode;
1553
1554 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1555 if (!inode) {
1556 ret = -ENOMEM;
1557 goto out;
1558 }
1559 inode->i_op = &simple_dir_inode_operations;
1560 inode->i_fop = &simple_dir_operations;
1561 inode->i_ino = ++(*ino);
1562 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1563 inc_nlink(inode);
1564 d_add(dentry, inode);
1565 /* bump link count on parent directory, too */
1566 inc_nlink(dir);
1567 out:
1568 return ret;
1569 }
1570
1571 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1572 {
1573 int ret;
1574 struct dentry *dentry;
1575 struct inode *inode, *root_inode;
1576 struct inode_security_struct *isec;
1577
1578 static struct tree_descr selinux_files[] = {
1579 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1580 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1581 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1582 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1583 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1584 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1585 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1586 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1587 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1588 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1589 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1590 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1591 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1592 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1593 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1594 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1595 /* last one */ {""}
1596 };
1597 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1598 if (ret)
1599 goto err;
1600
1601 root_inode = sb->s_root->d_inode;
1602
1603 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1604 if (!dentry) {
1605 ret = -ENOMEM;
1606 goto err;
1607 }
1608
1609 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1610 if (ret)
1611 goto err;
1612
1613 bool_dir = dentry;
1614
1615 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1616 if (!dentry) {
1617 ret = -ENOMEM;
1618 goto err;
1619 }
1620
1621 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1622 if (!inode) {
1623 ret = -ENOMEM;
1624 goto err;
1625 }
1626 inode->i_ino = ++sel_last_ino;
1627 isec = (struct inode_security_struct*)inode->i_security;
1628 isec->sid = SECINITSID_DEVNULL;
1629 isec->sclass = SECCLASS_CHR_FILE;
1630 isec->initialized = 1;
1631
1632 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1633 d_add(dentry, inode);
1634 selinux_null = dentry;
1635
1636 dentry = d_alloc_name(sb->s_root, "avc");
1637 if (!dentry) {
1638 ret = -ENOMEM;
1639 goto err;
1640 }
1641
1642 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1643 if (ret)
1644 goto err;
1645
1646 ret = sel_make_avc_files(dentry);
1647 if (ret)
1648 goto err;
1649
1650 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1651 if (!dentry) {
1652 ret = -ENOMEM;
1653 goto err;
1654 }
1655
1656 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1657 if (ret)
1658 goto err;
1659
1660 ret = sel_make_initcon_files(dentry);
1661 if (ret)
1662 goto err;
1663
1664 dentry = d_alloc_name(sb->s_root, "class");
1665 if (!dentry) {
1666 ret = -ENOMEM;
1667 goto err;
1668 }
1669
1670 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1671 if (ret)
1672 goto err;
1673
1674 class_dir = dentry;
1675
1676 out:
1677 return ret;
1678 err:
1679 printk(KERN_ERR "%s: failed while creating inodes\n", __FUNCTION__);
1680 goto out;
1681 }
1682
1683 static int sel_get_sb(struct file_system_type *fs_type,
1684 int flags, const char *dev_name, void *data,
1685 struct vfsmount *mnt)
1686 {
1687 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1688 }
1689
1690 static struct file_system_type sel_fs_type = {
1691 .name = "selinuxfs",
1692 .get_sb = sel_get_sb,
1693 .kill_sb = kill_litter_super,
1694 };
1695
1696 struct vfsmount *selinuxfs_mount;
1697
1698 static int __init init_sel_fs(void)
1699 {
1700 int err;
1701
1702 if (!selinux_enabled)
1703 return 0;
1704 err = register_filesystem(&sel_fs_type);
1705 if (!err) {
1706 selinuxfs_mount = kern_mount(&sel_fs_type);
1707 if (IS_ERR(selinuxfs_mount)) {
1708 printk(KERN_ERR "selinuxfs: could not mount!\n");
1709 err = PTR_ERR(selinuxfs_mount);
1710 selinuxfs_mount = NULL;
1711 }
1712 }
1713 return err;
1714 }
1715
1716 __initcall(init_sel_fs);
1717
1718 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1719 void exit_sel_fs(void)
1720 {
1721 unregister_filesystem(&sel_fs_type);
1722 }
1723 #endif
Linux kernel - Deliverables
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