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[SCSI] st: add st_scsi_execute helper function
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blobc86303638235f2633eaff9c5426eed950517f785
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 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
51 #define SELINUX_COMPAT_NET_VALUE 0
52 #else
53 #define SELINUX_COMPAT_NET_VALUE 1
54 #endif
55
56 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
57
58 static int __init checkreqprot_setup(char *str)
59 {
60 unsigned long checkreqprot;
61 if (!strict_strtoul(str, 0, &checkreqprot))
62 selinux_checkreqprot = checkreqprot ? 1 : 0;
63 return 1;
64 }
65 __setup("checkreqprot=", checkreqprot_setup);
66
67 static int __init selinux_compat_net_setup(char *str)
68 {
69 unsigned long compat_net;
70 if (!strict_strtoul(str, 0, &compat_net))
71 selinux_compat_net = compat_net ? 1 : 0;
72 return 1;
73 }
74 __setup("selinux_compat_net=", selinux_compat_net_setup);
75
76
77 static DEFINE_MUTEX(sel_mutex);
78
79 /* global data for booleans */
80 static struct dentry *bool_dir;
81 static int bool_num;
82 static char **bool_pending_names;
83 static int *bool_pending_values;
84
85 /* global data for classes */
86 static struct dentry *class_dir;
87 static unsigned long last_class_ino;
88
89 /* global data for policy capabilities */
90 static struct dentry *policycap_dir;
91
92 extern void selnl_notify_setenforce(int val);
93
94 /* Check whether a task is allowed to use a security operation. */
95 static int task_has_security(struct task_struct *tsk,
96 u32 perms)
97 {
98 const struct task_security_struct *tsec;
99 u32 sid = 0;
100
101 rcu_read_lock();
102 tsec = __task_cred(tsk)->security;
103 if (tsec)
104 sid = tsec->sid;
105 rcu_read_unlock();
106 if (!tsec)
107 return -EACCES;
108
109 return avc_has_perm(sid, SECINITSID_SECURITY,
110 SECCLASS_SECURITY, perms, NULL);
111 }
112
113 enum sel_inos {
114 SEL_ROOT_INO = 2,
115 SEL_LOAD, /* load policy */
116 SEL_ENFORCE, /* get or set enforcing status */
117 SEL_CONTEXT, /* validate context */
118 SEL_ACCESS, /* compute access decision */
119 SEL_CREATE, /* compute create labeling decision */
120 SEL_RELABEL, /* compute relabeling decision */
121 SEL_USER, /* compute reachable user contexts */
122 SEL_POLICYVERS, /* return policy version for this kernel */
123 SEL_COMMIT_BOOLS, /* commit new boolean values */
124 SEL_MLS, /* return if MLS policy is enabled */
125 SEL_DISABLE, /* disable SELinux until next reboot */
126 SEL_MEMBER, /* compute polyinstantiation membership decision */
127 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
128 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
129 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
130 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
131 SEL_INO_NEXT, /* The next inode number to use */
132 };
133
134 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
135
136 #define SEL_INITCON_INO_OFFSET 0x01000000
137 #define SEL_BOOL_INO_OFFSET 0x02000000
138 #define SEL_CLASS_INO_OFFSET 0x04000000
139 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
140 #define SEL_INO_MASK 0x00ffffff
141
142 #define TMPBUFLEN 12
143 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
144 size_t count, loff_t *ppos)
145 {
146 char tmpbuf[TMPBUFLEN];
147 ssize_t length;
148
149 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
150 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
151 }
152
153 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
154 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
155 size_t count, loff_t *ppos)
156
157 {
158 char *page;
159 ssize_t length;
160 int new_value;
161
162 if (count >= PAGE_SIZE)
163 return -ENOMEM;
164 if (*ppos != 0) {
165 /* No partial writes. */
166 return -EINVAL;
167 }
168 page = (char *)get_zeroed_page(GFP_KERNEL);
169 if (!page)
170 return -ENOMEM;
171 length = -EFAULT;
172 if (copy_from_user(page, buf, count))
173 goto out;
174
175 length = -EINVAL;
176 if (sscanf(page, "%d", &new_value) != 1)
177 goto out;
178
179 if (new_value != selinux_enforcing) {
180 length = task_has_security(current, SECURITY__SETENFORCE);
181 if (length)
182 goto out;
183 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
184 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
185 new_value, selinux_enforcing,
186 audit_get_loginuid(current),
187 audit_get_sessionid(current));
188 selinux_enforcing = new_value;
189 if (selinux_enforcing)
190 avc_ss_reset(0);
191 selnl_notify_setenforce(selinux_enforcing);
192 }
193 length = count;
194 out:
195 free_page((unsigned long) page);
196 return length;
197 }
198 #else
199 #define sel_write_enforce NULL
200 #endif
201
202 static const struct file_operations sel_enforce_ops = {
203 .read = sel_read_enforce,
204 .write = sel_write_enforce,
205 };
206
207 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
208 size_t count, loff_t *ppos)
209 {
210 char tmpbuf[TMPBUFLEN];
211 ssize_t length;
212 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
213 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
214 security_get_reject_unknown() : !security_get_allow_unknown();
215
216 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
217 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
218 }
219
220 static const struct file_operations sel_handle_unknown_ops = {
221 .read = sel_read_handle_unknown,
222 };
223
224 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
225 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
226 size_t count, loff_t *ppos)
227
228 {
229 char *page;
230 ssize_t length;
231 int new_value;
232 extern int selinux_disable(void);
233
234 if (count >= PAGE_SIZE)
235 return -ENOMEM;
236 if (*ppos != 0) {
237 /* No partial writes. */
238 return -EINVAL;
239 }
240 page = (char *)get_zeroed_page(GFP_KERNEL);
241 if (!page)
242 return -ENOMEM;
243 length = -EFAULT;
244 if (copy_from_user(page, buf, count))
245 goto out;
246
247 length = -EINVAL;
248 if (sscanf(page, "%d", &new_value) != 1)
249 goto out;
250
251 if (new_value) {
252 length = selinux_disable();
253 if (length < 0)
254 goto out;
255 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
256 "selinux=0 auid=%u ses=%u",
257 audit_get_loginuid(current),
258 audit_get_sessionid(current));
259 }
260
261 length = count;
262 out:
263 free_page((unsigned long) page);
264 return length;
265 }
266 #else
267 #define sel_write_disable NULL
268 #endif
269
270 static const struct file_operations sel_disable_ops = {
271 .write = sel_write_disable,
272 };
273
274 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
275 size_t count, loff_t *ppos)
276 {
277 char tmpbuf[TMPBUFLEN];
278 ssize_t length;
279
280 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
281 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
282 }
283
284 static const struct file_operations sel_policyvers_ops = {
285 .read = sel_read_policyvers,
286 };
287
288 /* declaration for sel_write_load */
289 static int sel_make_bools(void);
290 static int sel_make_classes(void);
291 static int sel_make_policycap(void);
292
293 /* declaration for sel_make_class_dirs */
294 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
295 unsigned long *ino);
296
297 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
298 size_t count, loff_t *ppos)
299 {
300 char tmpbuf[TMPBUFLEN];
301 ssize_t length;
302
303 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
304 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
305 }
306
307 static const struct file_operations sel_mls_ops = {
308 .read = sel_read_mls,
309 };
310
311 static ssize_t sel_write_load(struct file *file, const char __user *buf,
312 size_t count, loff_t *ppos)
313
314 {
315 int ret;
316 ssize_t length;
317 void *data = NULL;
318
319 mutex_lock(&sel_mutex);
320
321 length = task_has_security(current, SECURITY__LOAD_POLICY);
322 if (length)
323 goto out;
324
325 if (*ppos != 0) {
326 /* No partial writes. */
327 length = -EINVAL;
328 goto out;
329 }
330
331 if ((count > 64 * 1024 * 1024)
332 || (data = vmalloc(count)) == NULL) {
333 length = -ENOMEM;
334 goto out;
335 }
336
337 length = -EFAULT;
338 if (copy_from_user(data, buf, count) != 0)
339 goto out;
340
341 length = security_load_policy(data, count);
342 if (length)
343 goto out;
344
345 ret = sel_make_bools();
346 if (ret) {
347 length = ret;
348 goto out1;
349 }
350
351 ret = sel_make_classes();
352 if (ret) {
353 length = ret;
354 goto out1;
355 }
356
357 ret = sel_make_policycap();
358 if (ret)
359 length = ret;
360 else
361 length = count;
362
363 out1:
364 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
365 "policy loaded auid=%u ses=%u",
366 audit_get_loginuid(current),
367 audit_get_sessionid(current));
368 out:
369 mutex_unlock(&sel_mutex);
370 vfree(data);
371 return length;
372 }
373
374 static const struct file_operations sel_load_ops = {
375 .write = sel_write_load,
376 };
377
378 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
379 {
380 char *canon;
381 u32 sid, len;
382 ssize_t length;
383
384 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
385 if (length)
386 return length;
387
388 length = security_context_to_sid(buf, size, &sid);
389 if (length < 0)
390 return length;
391
392 length = security_sid_to_context(sid, &canon, &len);
393 if (length < 0)
394 return length;
395
396 if (len > SIMPLE_TRANSACTION_LIMIT) {
397 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
398 "payload max\n", __func__, len);
399 length = -ERANGE;
400 goto out;
401 }
402
403 memcpy(buf, canon, len);
404 length = len;
405 out:
406 kfree(canon);
407 return length;
408 }
409
410 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
411 size_t count, loff_t *ppos)
412 {
413 char tmpbuf[TMPBUFLEN];
414 ssize_t length;
415
416 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
417 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
418 }
419
420 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
421 size_t count, loff_t *ppos)
422 {
423 char *page;
424 ssize_t length;
425 unsigned int new_value;
426
427 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
428 if (length)
429 return length;
430
431 if (count >= PAGE_SIZE)
432 return -ENOMEM;
433 if (*ppos != 0) {
434 /* No partial writes. */
435 return -EINVAL;
436 }
437 page = (char *)get_zeroed_page(GFP_KERNEL);
438 if (!page)
439 return -ENOMEM;
440 length = -EFAULT;
441 if (copy_from_user(page, buf, count))
442 goto out;
443
444 length = -EINVAL;
445 if (sscanf(page, "%u", &new_value) != 1)
446 goto out;
447
448 selinux_checkreqprot = new_value ? 1 : 0;
449 length = count;
450 out:
451 free_page((unsigned long) page);
452 return length;
453 }
454 static const struct file_operations sel_checkreqprot_ops = {
455 .read = sel_read_checkreqprot,
456 .write = sel_write_checkreqprot,
457 };
458
459 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
460 size_t count, loff_t *ppos)
461 {
462 char tmpbuf[TMPBUFLEN];
463 ssize_t length;
464
465 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
466 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
467 }
468
469 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
470 size_t count, loff_t *ppos)
471 {
472 char *page;
473 ssize_t length;
474 int new_value;
475
476 length = task_has_security(current, SECURITY__LOAD_POLICY);
477 if (length)
478 return length;
479
480 if (count >= PAGE_SIZE)
481 return -ENOMEM;
482 if (*ppos != 0) {
483 /* No partial writes. */
484 return -EINVAL;
485 }
486 page = (char *)get_zeroed_page(GFP_KERNEL);
487 if (!page)
488 return -ENOMEM;
489 length = -EFAULT;
490 if (copy_from_user(page, buf, count))
491 goto out;
492
493 length = -EINVAL;
494 if (sscanf(page, "%d", &new_value) != 1)
495 goto out;
496
497 selinux_compat_net = new_value ? 1 : 0;
498 length = count;
499 out:
500 free_page((unsigned long) page);
501 return length;
502 }
503 static const struct file_operations sel_compat_net_ops = {
504 .read = sel_read_compat_net,
505 .write = sel_write_compat_net,
506 };
507
508 /*
509 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
510 */
511 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
512 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
513 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
514 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
515 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
516
517 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
518 [SEL_ACCESS] = sel_write_access,
519 [SEL_CREATE] = sel_write_create,
520 [SEL_RELABEL] = sel_write_relabel,
521 [SEL_USER] = sel_write_user,
522 [SEL_MEMBER] = sel_write_member,
523 [SEL_CONTEXT] = sel_write_context,
524 };
525
526 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
527 {
528 ino_t ino = file->f_path.dentry->d_inode->i_ino;
529 char *data;
530 ssize_t rv;
531
532 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
533 return -EINVAL;
534
535 data = simple_transaction_get(file, buf, size);
536 if (IS_ERR(data))
537 return PTR_ERR(data);
538
539 rv = write_op[ino](file, data, size);
540 if (rv > 0) {
541 simple_transaction_set(file, rv);
542 rv = size;
543 }
544 return rv;
545 }
546
547 static const struct file_operations transaction_ops = {
548 .write = selinux_transaction_write,
549 .read = simple_transaction_read,
550 .release = simple_transaction_release,
551 };
552
553 /*
554 * payload - write methods
555 * If the method has a response, the response should be put in buf,
556 * and the length returned. Otherwise return 0 or and -error.
557 */
558
559 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
560 {
561 char *scon, *tcon;
562 u32 ssid, tsid;
563 u16 tclass;
564 u32 req;
565 struct av_decision avd;
566 ssize_t length;
567
568 length = task_has_security(current, SECURITY__COMPUTE_AV);
569 if (length)
570 return length;
571
572 length = -ENOMEM;
573 scon = kzalloc(size+1, GFP_KERNEL);
574 if (!scon)
575 return length;
576
577 tcon = kzalloc(size+1, GFP_KERNEL);
578 if (!tcon)
579 goto out;
580
581 length = -EINVAL;
582 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
583 goto out2;
584
585 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
586 if (length < 0)
587 goto out2;
588 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
589 if (length < 0)
590 goto out2;
591
592 length = security_compute_av(ssid, tsid, tclass, req, &avd);
593 if (length < 0)
594 goto out2;
595
596 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
597 "%x %x %x %x %u",
598 avd.allowed, avd.decided,
599 avd.auditallow, avd.auditdeny,
600 avd.seqno);
601 out2:
602 kfree(tcon);
603 out:
604 kfree(scon);
605 return length;
606 }
607
608 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
609 {
610 char *scon, *tcon;
611 u32 ssid, tsid, newsid;
612 u16 tclass;
613 ssize_t length;
614 char *newcon;
615 u32 len;
616
617 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
618 if (length)
619 return length;
620
621 length = -ENOMEM;
622 scon = kzalloc(size+1, GFP_KERNEL);
623 if (!scon)
624 return length;
625
626 tcon = kzalloc(size+1, GFP_KERNEL);
627 if (!tcon)
628 goto out;
629
630 length = -EINVAL;
631 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
632 goto out2;
633
634 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
635 if (length < 0)
636 goto out2;
637 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
638 if (length < 0)
639 goto out2;
640
641 length = security_transition_sid(ssid, tsid, tclass, &newsid);
642 if (length < 0)
643 goto out2;
644
645 length = security_sid_to_context(newsid, &newcon, &len);
646 if (length < 0)
647 goto out2;
648
649 if (len > SIMPLE_TRANSACTION_LIMIT) {
650 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
651 "payload max\n", __func__, len);
652 length = -ERANGE;
653 goto out3;
654 }
655
656 memcpy(buf, newcon, len);
657 length = len;
658 out3:
659 kfree(newcon);
660 out2:
661 kfree(tcon);
662 out:
663 kfree(scon);
664 return length;
665 }
666
667 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
668 {
669 char *scon, *tcon;
670 u32 ssid, tsid, newsid;
671 u16 tclass;
672 ssize_t length;
673 char *newcon;
674 u32 len;
675
676 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
677 if (length)
678 return length;
679
680 length = -ENOMEM;
681 scon = kzalloc(size+1, GFP_KERNEL);
682 if (!scon)
683 return length;
684
685 tcon = kzalloc(size+1, GFP_KERNEL);
686 if (!tcon)
687 goto out;
688
689 length = -EINVAL;
690 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
691 goto out2;
692
693 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
694 if (length < 0)
695 goto out2;
696 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
697 if (length < 0)
698 goto out2;
699
700 length = security_change_sid(ssid, tsid, tclass, &newsid);
701 if (length < 0)
702 goto out2;
703
704 length = security_sid_to_context(newsid, &newcon, &len);
705 if (length < 0)
706 goto out2;
707
708 if (len > SIMPLE_TRANSACTION_LIMIT) {
709 length = -ERANGE;
710 goto out3;
711 }
712
713 memcpy(buf, newcon, len);
714 length = len;
715 out3:
716 kfree(newcon);
717 out2:
718 kfree(tcon);
719 out:
720 kfree(scon);
721 return length;
722 }
723
724 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
725 {
726 char *con, *user, *ptr;
727 u32 sid, *sids;
728 ssize_t length;
729 char *newcon;
730 int i, rc;
731 u32 len, nsids;
732
733 length = task_has_security(current, SECURITY__COMPUTE_USER);
734 if (length)
735 return length;
736
737 length = -ENOMEM;
738 con = kzalloc(size+1, GFP_KERNEL);
739 if (!con)
740 return length;
741
742 user = kzalloc(size+1, GFP_KERNEL);
743 if (!user)
744 goto out;
745
746 length = -EINVAL;
747 if (sscanf(buf, "%s %s", con, user) != 2)
748 goto out2;
749
750 length = security_context_to_sid(con, strlen(con)+1, &sid);
751 if (length < 0)
752 goto out2;
753
754 length = security_get_user_sids(sid, user, &sids, &nsids);
755 if (length < 0)
756 goto out2;
757
758 length = sprintf(buf, "%u", nsids) + 1;
759 ptr = buf + length;
760 for (i = 0; i < nsids; i++) {
761 rc = security_sid_to_context(sids[i], &newcon, &len);
762 if (rc) {
763 length = rc;
764 goto out3;
765 }
766 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
767 kfree(newcon);
768 length = -ERANGE;
769 goto out3;
770 }
771 memcpy(ptr, newcon, len);
772 kfree(newcon);
773 ptr += len;
774 length += len;
775 }
776 out3:
777 kfree(sids);
778 out2:
779 kfree(user);
780 out:
781 kfree(con);
782 return length;
783 }
784
785 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
786 {
787 char *scon, *tcon;
788 u32 ssid, tsid, newsid;
789 u16 tclass;
790 ssize_t length;
791 char *newcon;
792 u32 len;
793
794 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
795 if (length)
796 return length;
797
798 length = -ENOMEM;
799 scon = kzalloc(size+1, GFP_KERNEL);
800 if (!scon)
801 return length;
802
803 tcon = kzalloc(size+1, GFP_KERNEL);
804 if (!tcon)
805 goto out;
806
807 length = -EINVAL;
808 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
809 goto out2;
810
811 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
812 if (length < 0)
813 goto out2;
814 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
815 if (length < 0)
816 goto out2;
817
818 length = security_member_sid(ssid, tsid, tclass, &newsid);
819 if (length < 0)
820 goto out2;
821
822 length = security_sid_to_context(newsid, &newcon, &len);
823 if (length < 0)
824 goto out2;
825
826 if (len > SIMPLE_TRANSACTION_LIMIT) {
827 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
828 "payload max\n", __func__, len);
829 length = -ERANGE;
830 goto out3;
831 }
832
833 memcpy(buf, newcon, len);
834 length = len;
835 out3:
836 kfree(newcon);
837 out2:
838 kfree(tcon);
839 out:
840 kfree(scon);
841 return length;
842 }
843
844 static struct inode *sel_make_inode(struct super_block *sb, int mode)
845 {
846 struct inode *ret = new_inode(sb);
847
848 if (ret) {
849 ret->i_mode = mode;
850 ret->i_uid = ret->i_gid = 0;
851 ret->i_blocks = 0;
852 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
853 }
854 return ret;
855 }
856
857 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
858 size_t count, loff_t *ppos)
859 {
860 char *page = NULL;
861 ssize_t length;
862 ssize_t ret;
863 int cur_enforcing;
864 struct inode *inode = filep->f_path.dentry->d_inode;
865 unsigned index = inode->i_ino & SEL_INO_MASK;
866 const char *name = filep->f_path.dentry->d_name.name;
867
868 mutex_lock(&sel_mutex);
869
870 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
871 ret = -EINVAL;
872 goto out;
873 }
874
875 if (count > PAGE_SIZE) {
876 ret = -EINVAL;
877 goto out;
878 }
879 page = (char *)get_zeroed_page(GFP_KERNEL);
880 if (!page) {
881 ret = -ENOMEM;
882 goto out;
883 }
884
885 cur_enforcing = security_get_bool_value(index);
886 if (cur_enforcing < 0) {
887 ret = cur_enforcing;
888 goto out;
889 }
890 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
891 bool_pending_values[index]);
892 ret = simple_read_from_buffer(buf, count, ppos, page, length);
893 out:
894 mutex_unlock(&sel_mutex);
895 if (page)
896 free_page((unsigned long)page);
897 return ret;
898 }
899
900 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
901 size_t count, loff_t *ppos)
902 {
903 char *page = NULL;
904 ssize_t length;
905 int new_value;
906 struct inode *inode = filep->f_path.dentry->d_inode;
907 unsigned index = inode->i_ino & SEL_INO_MASK;
908 const char *name = filep->f_path.dentry->d_name.name;
909
910 mutex_lock(&sel_mutex);
911
912 length = task_has_security(current, SECURITY__SETBOOL);
913 if (length)
914 goto out;
915
916 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
917 length = -EINVAL;
918 goto out;
919 }
920
921 if (count >= PAGE_SIZE) {
922 length = -ENOMEM;
923 goto out;
924 }
925
926 if (*ppos != 0) {
927 /* No partial writes. */
928 length = -EINVAL;
929 goto out;
930 }
931 page = (char *)get_zeroed_page(GFP_KERNEL);
932 if (!page) {
933 length = -ENOMEM;
934 goto out;
935 }
936
937 length = -EFAULT;
938 if (copy_from_user(page, buf, count))
939 goto out;
940
941 length = -EINVAL;
942 if (sscanf(page, "%d", &new_value) != 1)
943 goto out;
944
945 if (new_value)
946 new_value = 1;
947
948 bool_pending_values[index] = new_value;
949 length = count;
950
951 out:
952 mutex_unlock(&sel_mutex);
953 if (page)
954 free_page((unsigned long) page);
955 return length;
956 }
957
958 static const struct file_operations sel_bool_ops = {
959 .read = sel_read_bool,
960 .write = sel_write_bool,
961 };
962
963 static ssize_t sel_commit_bools_write(struct file *filep,
964 const char __user *buf,
965 size_t count, loff_t *ppos)
966 {
967 char *page = NULL;
968 ssize_t length;
969 int new_value;
970
971 mutex_lock(&sel_mutex);
972
973 length = task_has_security(current, SECURITY__SETBOOL);
974 if (length)
975 goto out;
976
977 if (count >= PAGE_SIZE) {
978 length = -ENOMEM;
979 goto out;
980 }
981 if (*ppos != 0) {
982 /* No partial writes. */
983 goto out;
984 }
985 page = (char *)get_zeroed_page(GFP_KERNEL);
986 if (!page) {
987 length = -ENOMEM;
988 goto out;
989 }
990
991 length = -EFAULT;
992 if (copy_from_user(page, buf, count))
993 goto out;
994
995 length = -EINVAL;
996 if (sscanf(page, "%d", &new_value) != 1)
997 goto out;
998
999 if (new_value && bool_pending_values)
1000 security_set_bools(bool_num, bool_pending_values);
1001
1002 length = count;
1003
1004 out:
1005 mutex_unlock(&sel_mutex);
1006 if (page)
1007 free_page((unsigned long) page);
1008 return length;
1009 }
1010
1011 static const struct file_operations sel_commit_bools_ops = {
1012 .write = sel_commit_bools_write,
1013 };
1014
1015 static void sel_remove_entries(struct dentry *de)
1016 {
1017 struct list_head *node;
1018
1019 spin_lock(&dcache_lock);
1020 node = de->d_subdirs.next;
1021 while (node != &de->d_subdirs) {
1022 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1023 list_del_init(node);
1024
1025 if (d->d_inode) {
1026 d = dget_locked(d);
1027 spin_unlock(&dcache_lock);
1028 d_delete(d);
1029 simple_unlink(de->d_inode, d);
1030 dput(d);
1031 spin_lock(&dcache_lock);
1032 }
1033 node = de->d_subdirs.next;
1034 }
1035
1036 spin_unlock(&dcache_lock);
1037 }
1038
1039 #define BOOL_DIR_NAME "booleans"
1040
1041 static int sel_make_bools(void)
1042 {
1043 int i, ret = 0;
1044 ssize_t len;
1045 struct dentry *dentry = NULL;
1046 struct dentry *dir = bool_dir;
1047 struct inode *inode = NULL;
1048 struct inode_security_struct *isec;
1049 char **names = NULL, *page;
1050 int num;
1051 int *values = NULL;
1052 u32 sid;
1053
1054 /* remove any existing files */
1055 kfree(bool_pending_names);
1056 kfree(bool_pending_values);
1057 bool_pending_names = NULL;
1058 bool_pending_values = NULL;
1059
1060 sel_remove_entries(dir);
1061
1062 page = (char *)get_zeroed_page(GFP_KERNEL);
1063 if (!page)
1064 return -ENOMEM;
1065
1066 ret = security_get_bools(&num, &names, &values);
1067 if (ret != 0)
1068 goto out;
1069
1070 for (i = 0; i < num; i++) {
1071 dentry = d_alloc_name(dir, names[i]);
1072 if (!dentry) {
1073 ret = -ENOMEM;
1074 goto err;
1075 }
1076 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1077 if (!inode) {
1078 ret = -ENOMEM;
1079 goto err;
1080 }
1081
1082 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1083 if (len < 0) {
1084 ret = -EINVAL;
1085 goto err;
1086 } else if (len >= PAGE_SIZE) {
1087 ret = -ENAMETOOLONG;
1088 goto err;
1089 }
1090 isec = (struct inode_security_struct *)inode->i_security;
1091 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1092 if (ret)
1093 goto err;
1094 isec->sid = sid;
1095 isec->initialized = 1;
1096 inode->i_fop = &sel_bool_ops;
1097 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1098 d_add(dentry, inode);
1099 }
1100 bool_num = num;
1101 bool_pending_names = names;
1102 bool_pending_values = values;
1103 out:
1104 free_page((unsigned long)page);
1105 return ret;
1106 err:
1107 if (names) {
1108 for (i = 0; i < num; i++)
1109 kfree(names[i]);
1110 kfree(names);
1111 }
1112 kfree(values);
1113 sel_remove_entries(dir);
1114 ret = -ENOMEM;
1115 goto out;
1116 }
1117
1118 #define NULL_FILE_NAME "null"
1119
1120 struct dentry *selinux_null;
1121
1122 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1123 size_t count, loff_t *ppos)
1124 {
1125 char tmpbuf[TMPBUFLEN];
1126 ssize_t length;
1127
1128 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1129 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1130 }
1131
1132 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1133 const char __user *buf,
1134 size_t count, loff_t *ppos)
1135
1136 {
1137 char *page;
1138 ssize_t ret;
1139 int new_value;
1140
1141 if (count >= PAGE_SIZE) {
1142 ret = -ENOMEM;
1143 goto out;
1144 }
1145
1146 if (*ppos != 0) {
1147 /* No partial writes. */
1148 ret = -EINVAL;
1149 goto out;
1150 }
1151
1152 page = (char *)get_zeroed_page(GFP_KERNEL);
1153 if (!page) {
1154 ret = -ENOMEM;
1155 goto out;
1156 }
1157
1158 if (copy_from_user(page, buf, count)) {
1159 ret = -EFAULT;
1160 goto out_free;
1161 }
1162
1163 if (sscanf(page, "%u", &new_value) != 1) {
1164 ret = -EINVAL;
1165 goto out;
1166 }
1167
1168 if (new_value != avc_cache_threshold) {
1169 ret = task_has_security(current, SECURITY__SETSECPARAM);
1170 if (ret)
1171 goto out_free;
1172 avc_cache_threshold = new_value;
1173 }
1174 ret = count;
1175 out_free:
1176 free_page((unsigned long)page);
1177 out:
1178 return ret;
1179 }
1180
1181 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1182 size_t count, loff_t *ppos)
1183 {
1184 char *page;
1185 ssize_t ret = 0;
1186
1187 page = (char *)__get_free_page(GFP_KERNEL);
1188 if (!page) {
1189 ret = -ENOMEM;
1190 goto out;
1191 }
1192 ret = avc_get_hash_stats(page);
1193 if (ret >= 0)
1194 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1195 free_page((unsigned long)page);
1196 out:
1197 return ret;
1198 }
1199
1200 static const struct file_operations sel_avc_cache_threshold_ops = {
1201 .read = sel_read_avc_cache_threshold,
1202 .write = sel_write_avc_cache_threshold,
1203 };
1204
1205 static const struct file_operations sel_avc_hash_stats_ops = {
1206 .read = sel_read_avc_hash_stats,
1207 };
1208
1209 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1210 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1211 {
1212 int cpu;
1213
1214 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1215 if (!cpu_possible(cpu))
1216 continue;
1217 *idx = cpu + 1;
1218 return &per_cpu(avc_cache_stats, cpu);
1219 }
1220 return NULL;
1221 }
1222
1223 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1224 {
1225 loff_t n = *pos - 1;
1226
1227 if (*pos == 0)
1228 return SEQ_START_TOKEN;
1229
1230 return sel_avc_get_stat_idx(&n);
1231 }
1232
1233 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1234 {
1235 return sel_avc_get_stat_idx(pos);
1236 }
1237
1238 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1239 {
1240 struct avc_cache_stats *st = v;
1241
1242 if (v == SEQ_START_TOKEN)
1243 seq_printf(seq, "lookups hits misses allocations reclaims "
1244 "frees\n");
1245 else
1246 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1247 st->hits, st->misses, st->allocations,
1248 st->reclaims, st->frees);
1249 return 0;
1250 }
1251
1252 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1253 { }
1254
1255 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1256 .start = sel_avc_stats_seq_start,
1257 .next = sel_avc_stats_seq_next,
1258 .show = sel_avc_stats_seq_show,
1259 .stop = sel_avc_stats_seq_stop,
1260 };
1261
1262 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1263 {
1264 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1265 }
1266
1267 static const struct file_operations sel_avc_cache_stats_ops = {
1268 .open = sel_open_avc_cache_stats,
1269 .read = seq_read,
1270 .llseek = seq_lseek,
1271 .release = seq_release,
1272 };
1273 #endif
1274
1275 static int sel_make_avc_files(struct dentry *dir)
1276 {
1277 int i, ret = 0;
1278 static struct tree_descr files[] = {
1279 { "cache_threshold",
1280 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1281 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1282 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1283 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1284 #endif
1285 };
1286
1287 for (i = 0; i < ARRAY_SIZE(files); i++) {
1288 struct inode *inode;
1289 struct dentry *dentry;
1290
1291 dentry = d_alloc_name(dir, files[i].name);
1292 if (!dentry) {
1293 ret = -ENOMEM;
1294 goto out;
1295 }
1296
1297 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1298 if (!inode) {
1299 ret = -ENOMEM;
1300 goto out;
1301 }
1302 inode->i_fop = files[i].ops;
1303 inode->i_ino = ++sel_last_ino;
1304 d_add(dentry, inode);
1305 }
1306 out:
1307 return ret;
1308 }
1309
1310 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1311 size_t count, loff_t *ppos)
1312 {
1313 struct inode *inode;
1314 char *con;
1315 u32 sid, len;
1316 ssize_t ret;
1317
1318 inode = file->f_path.dentry->d_inode;
1319 sid = inode->i_ino&SEL_INO_MASK;
1320 ret = security_sid_to_context(sid, &con, &len);
1321 if (ret < 0)
1322 return ret;
1323
1324 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1325 kfree(con);
1326 return ret;
1327 }
1328
1329 static const struct file_operations sel_initcon_ops = {
1330 .read = sel_read_initcon,
1331 };
1332
1333 static int sel_make_initcon_files(struct dentry *dir)
1334 {
1335 int i, ret = 0;
1336
1337 for (i = 1; i <= SECINITSID_NUM; i++) {
1338 struct inode *inode;
1339 struct dentry *dentry;
1340 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1341 if (!dentry) {
1342 ret = -ENOMEM;
1343 goto out;
1344 }
1345
1346 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1347 if (!inode) {
1348 ret = -ENOMEM;
1349 goto out;
1350 }
1351 inode->i_fop = &sel_initcon_ops;
1352 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1353 d_add(dentry, inode);
1354 }
1355 out:
1356 return ret;
1357 }
1358
1359 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1360 {
1361 return a / b - (a % b < 0);
1362 }
1363
1364 static inline unsigned long sel_class_to_ino(u16 class)
1365 {
1366 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1367 }
1368
1369 static inline u16 sel_ino_to_class(unsigned long ino)
1370 {
1371 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1372 }
1373
1374 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1375 {
1376 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1377 }
1378
1379 static inline u32 sel_ino_to_perm(unsigned long ino)
1380 {
1381 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1382 }
1383
1384 static ssize_t sel_read_class(struct file *file, char __user *buf,
1385 size_t count, loff_t *ppos)
1386 {
1387 ssize_t rc, len;
1388 char *page;
1389 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1390
1391 page = (char *)__get_free_page(GFP_KERNEL);
1392 if (!page) {
1393 rc = -ENOMEM;
1394 goto out;
1395 }
1396
1397 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1398 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1399 free_page((unsigned long)page);
1400 out:
1401 return rc;
1402 }
1403
1404 static const struct file_operations sel_class_ops = {
1405 .read = sel_read_class,
1406 };
1407
1408 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1409 size_t count, loff_t *ppos)
1410 {
1411 ssize_t rc, len;
1412 char *page;
1413 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1414
1415 page = (char *)__get_free_page(GFP_KERNEL);
1416 if (!page) {
1417 rc = -ENOMEM;
1418 goto out;
1419 }
1420
1421 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1422 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1423 free_page((unsigned long)page);
1424 out:
1425 return rc;
1426 }
1427
1428 static const struct file_operations sel_perm_ops = {
1429 .read = sel_read_perm,
1430 };
1431
1432 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1433 size_t count, loff_t *ppos)
1434 {
1435 int value;
1436 char tmpbuf[TMPBUFLEN];
1437 ssize_t length;
1438 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1439
1440 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1441 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1442
1443 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1444 }
1445
1446 static const struct file_operations sel_policycap_ops = {
1447 .read = sel_read_policycap,
1448 };
1449
1450 static int sel_make_perm_files(char *objclass, int classvalue,
1451 struct dentry *dir)
1452 {
1453 int i, rc = 0, nperms;
1454 char **perms;
1455
1456 rc = security_get_permissions(objclass, &perms, &nperms);
1457 if (rc)
1458 goto out;
1459
1460 for (i = 0; i < nperms; i++) {
1461 struct inode *inode;
1462 struct dentry *dentry;
1463
1464 dentry = d_alloc_name(dir, perms[i]);
1465 if (!dentry) {
1466 rc = -ENOMEM;
1467 goto out1;
1468 }
1469
1470 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1471 if (!inode) {
1472 rc = -ENOMEM;
1473 goto out1;
1474 }
1475 inode->i_fop = &sel_perm_ops;
1476 /* i+1 since perm values are 1-indexed */
1477 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1478 d_add(dentry, inode);
1479 }
1480
1481 out1:
1482 for (i = 0; i < nperms; i++)
1483 kfree(perms[i]);
1484 kfree(perms);
1485 out:
1486 return rc;
1487 }
1488
1489 static int sel_make_class_dir_entries(char *classname, int index,
1490 struct dentry *dir)
1491 {
1492 struct dentry *dentry = NULL;
1493 struct inode *inode = NULL;
1494 int rc;
1495
1496 dentry = d_alloc_name(dir, "index");
1497 if (!dentry) {
1498 rc = -ENOMEM;
1499 goto out;
1500 }
1501
1502 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1503 if (!inode) {
1504 rc = -ENOMEM;
1505 goto out;
1506 }
1507
1508 inode->i_fop = &sel_class_ops;
1509 inode->i_ino = sel_class_to_ino(index);
1510 d_add(dentry, inode);
1511
1512 dentry = d_alloc_name(dir, "perms");
1513 if (!dentry) {
1514 rc = -ENOMEM;
1515 goto out;
1516 }
1517
1518 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1519 if (rc)
1520 goto out;
1521
1522 rc = sel_make_perm_files(classname, index, dentry);
1523
1524 out:
1525 return rc;
1526 }
1527
1528 static void sel_remove_classes(void)
1529 {
1530 struct list_head *class_node;
1531
1532 list_for_each(class_node, &class_dir->d_subdirs) {
1533 struct dentry *class_subdir = list_entry(class_node,
1534 struct dentry, d_u.d_child);
1535 struct list_head *class_subdir_node;
1536
1537 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1538 struct dentry *d = list_entry(class_subdir_node,
1539 struct dentry, d_u.d_child);
1540
1541 if (d->d_inode)
1542 if (d->d_inode->i_mode & S_IFDIR)
1543 sel_remove_entries(d);
1544 }
1545
1546 sel_remove_entries(class_subdir);
1547 }
1548
1549 sel_remove_entries(class_dir);
1550 }
1551
1552 static int sel_make_classes(void)
1553 {
1554 int rc = 0, nclasses, i;
1555 char **classes;
1556
1557 /* delete any existing entries */
1558 sel_remove_classes();
1559
1560 rc = security_get_classes(&classes, &nclasses);
1561 if (rc < 0)
1562 goto out;
1563
1564 /* +2 since classes are 1-indexed */
1565 last_class_ino = sel_class_to_ino(nclasses+2);
1566
1567 for (i = 0; i < nclasses; i++) {
1568 struct dentry *class_name_dir;
1569
1570 class_name_dir = d_alloc_name(class_dir, classes[i]);
1571 if (!class_name_dir) {
1572 rc = -ENOMEM;
1573 goto out1;
1574 }
1575
1576 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1577 &last_class_ino);
1578 if (rc)
1579 goto out1;
1580
1581 /* i+1 since class values are 1-indexed */
1582 rc = sel_make_class_dir_entries(classes[i], i+1,
1583 class_name_dir);
1584 if (rc)
1585 goto out1;
1586 }
1587
1588 out1:
1589 for (i = 0; i < nclasses; i++)
1590 kfree(classes[i]);
1591 kfree(classes);
1592 out:
1593 return rc;
1594 }
1595
1596 static int sel_make_policycap(void)
1597 {
1598 unsigned int iter;
1599 struct dentry *dentry = NULL;
1600 struct inode *inode = NULL;
1601
1602 sel_remove_entries(policycap_dir);
1603
1604 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1605 if (iter < ARRAY_SIZE(policycap_names))
1606 dentry = d_alloc_name(policycap_dir,
1607 policycap_names[iter]);
1608 else
1609 dentry = d_alloc_name(policycap_dir, "unknown");
1610
1611 if (dentry == NULL)
1612 return -ENOMEM;
1613
1614 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1615 if (inode == NULL)
1616 return -ENOMEM;
1617
1618 inode->i_fop = &sel_policycap_ops;
1619 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1620 d_add(dentry, inode);
1621 }
1622
1623 return 0;
1624 }
1625
1626 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1627 unsigned long *ino)
1628 {
1629 int ret = 0;
1630 struct inode *inode;
1631
1632 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1633 if (!inode) {
1634 ret = -ENOMEM;
1635 goto out;
1636 }
1637 inode->i_op = &simple_dir_inode_operations;
1638 inode->i_fop = &simple_dir_operations;
1639 inode->i_ino = ++(*ino);
1640 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1641 inc_nlink(inode);
1642 d_add(dentry, inode);
1643 /* bump link count on parent directory, too */
1644 inc_nlink(dir);
1645 out:
1646 return ret;
1647 }
1648
1649 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1650 {
1651 int ret;
1652 struct dentry *dentry;
1653 struct inode *inode, *root_inode;
1654 struct inode_security_struct *isec;
1655
1656 static struct tree_descr selinux_files[] = {
1657 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1658 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1659 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1660 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1661 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1662 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1663 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1664 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1665 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1666 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1667 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1668 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1669 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1670 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1671 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1672 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1673 /* last one */ {""}
1674 };
1675 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1676 if (ret)
1677 goto err;
1678
1679 root_inode = sb->s_root->d_inode;
1680
1681 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1682 if (!dentry) {
1683 ret = -ENOMEM;
1684 goto err;
1685 }
1686
1687 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1688 if (ret)
1689 goto err;
1690
1691 bool_dir = dentry;
1692
1693 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1694 if (!dentry) {
1695 ret = -ENOMEM;
1696 goto err;
1697 }
1698
1699 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1700 if (!inode) {
1701 ret = -ENOMEM;
1702 goto err;
1703 }
1704 inode->i_ino = ++sel_last_ino;
1705 isec = (struct inode_security_struct *)inode->i_security;
1706 isec->sid = SECINITSID_DEVNULL;
1707 isec->sclass = SECCLASS_CHR_FILE;
1708 isec->initialized = 1;
1709
1710 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1711 d_add(dentry, inode);
1712 selinux_null = dentry;
1713
1714 dentry = d_alloc_name(sb->s_root, "avc");
1715 if (!dentry) {
1716 ret = -ENOMEM;
1717 goto err;
1718 }
1719
1720 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1721 if (ret)
1722 goto err;
1723
1724 ret = sel_make_avc_files(dentry);
1725 if (ret)
1726 goto err;
1727
1728 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1729 if (!dentry) {
1730 ret = -ENOMEM;
1731 goto err;
1732 }
1733
1734 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1735 if (ret)
1736 goto err;
1737
1738 ret = sel_make_initcon_files(dentry);
1739 if (ret)
1740 goto err;
1741
1742 dentry = d_alloc_name(sb->s_root, "class");
1743 if (!dentry) {
1744 ret = -ENOMEM;
1745 goto err;
1746 }
1747
1748 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1749 if (ret)
1750 goto err;
1751
1752 class_dir = dentry;
1753
1754 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1755 if (!dentry) {
1756 ret = -ENOMEM;
1757 goto err;
1758 }
1759
1760 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1761 if (ret)
1762 goto err;
1763
1764 policycap_dir = dentry;
1765
1766 out:
1767 return ret;
1768 err:
1769 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1770 __func__);
1771 goto out;
1772 }
1773
1774 static int sel_get_sb(struct file_system_type *fs_type,
1775 int flags, const char *dev_name, void *data,
1776 struct vfsmount *mnt)
1777 {
1778 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1779 }
1780
1781 static struct file_system_type sel_fs_type = {
1782 .name = "selinuxfs",
1783 .get_sb = sel_get_sb,
1784 .kill_sb = kill_litter_super,
1785 };
1786
1787 struct vfsmount *selinuxfs_mount;
1788
1789 static int __init init_sel_fs(void)
1790 {
1791 int err;
1792
1793 if (!selinux_enabled)
1794 return 0;
1795 err = register_filesystem(&sel_fs_type);
1796 if (!err) {
1797 selinuxfs_mount = kern_mount(&sel_fs_type);
1798 if (IS_ERR(selinuxfs_mount)) {
1799 printk(KERN_ERR "selinuxfs: could not mount!\n");
1800 err = PTR_ERR(selinuxfs_mount);
1801 selinuxfs_mount = NULL;
1802 }
1803 }
1804 return err;
1805 }
1806
1807 __initcall(init_sel_fs);
1808
1809 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1810 void exit_sel_fs(void)
1811 {
1812 unregister_filesystem(&sel_fs_type);
1813 }
1814 #endif
Linux with added FPC-III support