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block: Skip I/O merges when disabled
[linux-2.6/mini2440.git] / security / selinux / selinuxfs.c
blobac1ccc13a704cfaffc87a334a03388bf7f0a2d45
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 <asm/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 selinux_checkreqprot = simple_strtoul(str, NULL, 0) ? 1 : 0;
61 return 1;
62 }
63 __setup("checkreqprot=", checkreqprot_setup);
64
65 static int __init selinux_compat_net_setup(char *str)
66 {
67 selinux_compat_net = simple_strtoul(str, NULL, 0) ? 1 : 0;
68 return 1;
69 }
70 __setup("selinux_compat_net=", selinux_compat_net_setup);
71
72
73 static DEFINE_MUTEX(sel_mutex);
74
75 /* global data for booleans */
76 static struct dentry *bool_dir;
77 static int bool_num;
78 static char **bool_pending_names;
79 static int *bool_pending_values;
80
81 /* global data for classes */
82 static struct dentry *class_dir;
83 static unsigned long last_class_ino;
84
85 /* global data for policy capabilities */
86 static struct dentry *policycap_dir;
87
88 extern void selnl_notify_setenforce(int val);
89
90 /* Check whether a task is allowed to use a security operation. */
91 static int task_has_security(struct task_struct *tsk,
92 u32 perms)
93 {
94 struct task_security_struct *tsec;
95
96 tsec = tsk->security;
97 if (!tsec)
98 return -EACCES;
99
100 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
101 SECCLASS_SECURITY, perms, NULL);
102 }
103
104 enum sel_inos {
105 SEL_ROOT_INO = 2,
106 SEL_LOAD, /* load policy */
107 SEL_ENFORCE, /* get or set enforcing status */
108 SEL_CONTEXT, /* validate context */
109 SEL_ACCESS, /* compute access decision */
110 SEL_CREATE, /* compute create labeling decision */
111 SEL_RELABEL, /* compute relabeling decision */
112 SEL_USER, /* compute reachable user contexts */
113 SEL_POLICYVERS, /* return policy version for this kernel */
114 SEL_COMMIT_BOOLS, /* commit new boolean values */
115 SEL_MLS, /* return if MLS policy is enabled */
116 SEL_DISABLE, /* disable SELinux until next reboot */
117 SEL_MEMBER, /* compute polyinstantiation membership decision */
118 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
119 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
120 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
121 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
122 SEL_INO_NEXT, /* The next inode number to use */
123 };
124
125 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
126
127 #define SEL_INITCON_INO_OFFSET 0x01000000
128 #define SEL_BOOL_INO_OFFSET 0x02000000
129 #define SEL_CLASS_INO_OFFSET 0x04000000
130 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
131 #define SEL_INO_MASK 0x00ffffff
132
133 #define TMPBUFLEN 12
134 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
135 size_t count, loff_t *ppos)
136 {
137 char tmpbuf[TMPBUFLEN];
138 ssize_t length;
139
140 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
141 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
142 }
143
144 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
145 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
146 size_t count, loff_t *ppos)
147
148 {
149 char *page;
150 ssize_t length;
151 int new_value;
152
153 if (count >= PAGE_SIZE)
154 return -ENOMEM;
155 if (*ppos != 0) {
156 /* No partial writes. */
157 return -EINVAL;
158 }
159 page = (char *)get_zeroed_page(GFP_KERNEL);
160 if (!page)
161 return -ENOMEM;
162 length = -EFAULT;
163 if (copy_from_user(page, buf, count))
164 goto out;
165
166 length = -EINVAL;
167 if (sscanf(page, "%d", &new_value) != 1)
168 goto out;
169
170 if (new_value != selinux_enforcing) {
171 length = task_has_security(current, SECURITY__SETENFORCE);
172 if (length)
173 goto out;
174 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
175 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
176 new_value, selinux_enforcing,
177 audit_get_loginuid(current),
178 audit_get_sessionid(current));
179 selinux_enforcing = new_value;
180 if (selinux_enforcing)
181 avc_ss_reset(0);
182 selnl_notify_setenforce(selinux_enforcing);
183 }
184 length = count;
185 out:
186 free_page((unsigned long) page);
187 return length;
188 }
189 #else
190 #define sel_write_enforce NULL
191 #endif
192
193 static const struct file_operations sel_enforce_ops = {
194 .read = sel_read_enforce,
195 .write = sel_write_enforce,
196 };
197
198 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
199 size_t count, loff_t *ppos)
200 {
201 char tmpbuf[TMPBUFLEN];
202 ssize_t length;
203 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
204 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
205 security_get_reject_unknown() : !security_get_allow_unknown();
206
207 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
208 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
209 }
210
211 static const struct file_operations sel_handle_unknown_ops = {
212 .read = sel_read_handle_unknown,
213 };
214
215 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
216 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
217 size_t count, loff_t *ppos)
218
219 {
220 char *page;
221 ssize_t length;
222 int new_value;
223 extern int selinux_disable(void);
224
225 if (count >= PAGE_SIZE)
226 return -ENOMEM;
227 if (*ppos != 0) {
228 /* No partial writes. */
229 return -EINVAL;
230 }
231 page = (char *)get_zeroed_page(GFP_KERNEL);
232 if (!page)
233 return -ENOMEM;
234 length = -EFAULT;
235 if (copy_from_user(page, buf, count))
236 goto out;
237
238 length = -EINVAL;
239 if (sscanf(page, "%d", &new_value) != 1)
240 goto out;
241
242 if (new_value) {
243 length = selinux_disable();
244 if (length < 0)
245 goto out;
246 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
247 "selinux=0 auid=%u ses=%u",
248 audit_get_loginuid(current),
249 audit_get_sessionid(current));
250 }
251
252 length = count;
253 out:
254 free_page((unsigned long) page);
255 return length;
256 }
257 #else
258 #define sel_write_disable NULL
259 #endif
260
261 static const struct file_operations sel_disable_ops = {
262 .write = sel_write_disable,
263 };
264
265 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
266 size_t count, loff_t *ppos)
267 {
268 char tmpbuf[TMPBUFLEN];
269 ssize_t length;
270
271 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
272 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
273 }
274
275 static const struct file_operations sel_policyvers_ops = {
276 .read = sel_read_policyvers,
277 };
278
279 /* declaration for sel_write_load */
280 static int sel_make_bools(void);
281 static int sel_make_classes(void);
282 static int sel_make_policycap(void);
283
284 /* declaration for sel_make_class_dirs */
285 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
286 unsigned long *ino);
287
288 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
289 size_t count, loff_t *ppos)
290 {
291 char tmpbuf[TMPBUFLEN];
292 ssize_t length;
293
294 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
295 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
296 }
297
298 static const struct file_operations sel_mls_ops = {
299 .read = sel_read_mls,
300 };
301
302 static ssize_t sel_write_load(struct file *file, const char __user *buf,
303 size_t count, loff_t *ppos)
304
305 {
306 int ret;
307 ssize_t length;
308 void *data = NULL;
309
310 mutex_lock(&sel_mutex);
311
312 length = task_has_security(current, SECURITY__LOAD_POLICY);
313 if (length)
314 goto out;
315
316 if (*ppos != 0) {
317 /* No partial writes. */
318 length = -EINVAL;
319 goto out;
320 }
321
322 if ((count > 64 * 1024 * 1024)
323 || (data = vmalloc(count)) == NULL) {
324 length = -ENOMEM;
325 goto out;
326 }
327
328 length = -EFAULT;
329 if (copy_from_user(data, buf, count) != 0)
330 goto out;
331
332 length = security_load_policy(data, count);
333 if (length)
334 goto out;
335
336 ret = sel_make_bools();
337 if (ret) {
338 length = ret;
339 goto out1;
340 }
341
342 ret = sel_make_classes();
343 if (ret) {
344 length = ret;
345 goto out1;
346 }
347
348 ret = sel_make_policycap();
349 if (ret)
350 length = ret;
351 else
352 length = count;
353
354 out1:
355
356 printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
357 (security_get_reject_unknown() ? "reject" :
358 (security_get_allow_unknown() ? "allow" : "deny")));
359
360 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
361 "policy loaded auid=%u ses=%u",
362 audit_get_loginuid(current),
363 audit_get_sessionid(current));
364 out:
365 mutex_unlock(&sel_mutex);
366 vfree(data);
367 return length;
368 }
369
370 static const struct file_operations sel_load_ops = {
371 .write = sel_write_load,
372 };
373
374 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
375 {
376 char *canon;
377 u32 sid, len;
378 ssize_t length;
379
380 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
381 if (length)
382 return length;
383
384 length = security_context_to_sid(buf, size, &sid);
385 if (length < 0)
386 return length;
387
388 length = security_sid_to_context(sid, &canon, &len);
389 if (length < 0)
390 return length;
391
392 if (len > SIMPLE_TRANSACTION_LIMIT) {
393 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
394 "payload max\n", __func__, len);
395 length = -ERANGE;
396 goto out;
397 }
398
399 memcpy(buf, canon, len);
400 length = len;
401 out:
402 kfree(canon);
403 return length;
404 }
405
406 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
407 size_t count, loff_t *ppos)
408 {
409 char tmpbuf[TMPBUFLEN];
410 ssize_t length;
411
412 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
413 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
414 }
415
416 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
417 size_t count, loff_t *ppos)
418 {
419 char *page;
420 ssize_t length;
421 unsigned int new_value;
422
423 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
424 if (length)
425 return length;
426
427 if (count >= PAGE_SIZE)
428 return -ENOMEM;
429 if (*ppos != 0) {
430 /* No partial writes. */
431 return -EINVAL;
432 }
433 page = (char *)get_zeroed_page(GFP_KERNEL);
434 if (!page)
435 return -ENOMEM;
436 length = -EFAULT;
437 if (copy_from_user(page, buf, count))
438 goto out;
439
440 length = -EINVAL;
441 if (sscanf(page, "%u", &new_value) != 1)
442 goto out;
443
444 selinux_checkreqprot = new_value ? 1 : 0;
445 length = count;
446 out:
447 free_page((unsigned long) page);
448 return length;
449 }
450 static const struct file_operations sel_checkreqprot_ops = {
451 .read = sel_read_checkreqprot,
452 .write = sel_write_checkreqprot,
453 };
454
455 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
456 size_t count, loff_t *ppos)
457 {
458 char tmpbuf[TMPBUFLEN];
459 ssize_t length;
460
461 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
462 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
463 }
464
465 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
466 size_t count, loff_t *ppos)
467 {
468 char *page;
469 ssize_t length;
470 int new_value;
471
472 length = task_has_security(current, SECURITY__LOAD_POLICY);
473 if (length)
474 return length;
475
476 if (count >= PAGE_SIZE)
477 return -ENOMEM;
478 if (*ppos != 0) {
479 /* No partial writes. */
480 return -EINVAL;
481 }
482 page = (char *)get_zeroed_page(GFP_KERNEL);
483 if (!page)
484 return -ENOMEM;
485 length = -EFAULT;
486 if (copy_from_user(page, buf, count))
487 goto out;
488
489 length = -EINVAL;
490 if (sscanf(page, "%d", &new_value) != 1)
491 goto out;
492
493 selinux_compat_net = new_value ? 1 : 0;
494 length = count;
495 out:
496 free_page((unsigned long) page);
497 return length;
498 }
499 static const struct file_operations sel_compat_net_ops = {
500 .read = sel_read_compat_net,
501 .write = sel_write_compat_net,
502 };
503
504 /*
505 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
506 */
507 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
508 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
509 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
510 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
511 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
512
513 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
514 [SEL_ACCESS] = sel_write_access,
515 [SEL_CREATE] = sel_write_create,
516 [SEL_RELABEL] = sel_write_relabel,
517 [SEL_USER] = sel_write_user,
518 [SEL_MEMBER] = sel_write_member,
519 [SEL_CONTEXT] = sel_write_context,
520 };
521
522 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
523 {
524 ino_t ino = file->f_path.dentry->d_inode->i_ino;
525 char *data;
526 ssize_t rv;
527
528 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
529 return -EINVAL;
530
531 data = simple_transaction_get(file, buf, size);
532 if (IS_ERR(data))
533 return PTR_ERR(data);
534
535 rv = write_op[ino](file, data, size);
536 if (rv > 0) {
537 simple_transaction_set(file, rv);
538 rv = size;
539 }
540 return rv;
541 }
542
543 static const struct file_operations transaction_ops = {
544 .write = selinux_transaction_write,
545 .read = simple_transaction_read,
546 .release = simple_transaction_release,
547 };
548
549 /*
550 * payload - write methods
551 * If the method has a response, the response should be put in buf,
552 * and the length returned. Otherwise return 0 or and -error.
553 */
554
555 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
556 {
557 char *scon, *tcon;
558 u32 ssid, tsid;
559 u16 tclass;
560 u32 req;
561 struct av_decision avd;
562 ssize_t length;
563
564 length = task_has_security(current, SECURITY__COMPUTE_AV);
565 if (length)
566 return length;
567
568 length = -ENOMEM;
569 scon = kzalloc(size+1, GFP_KERNEL);
570 if (!scon)
571 return length;
572
573 tcon = kzalloc(size+1, GFP_KERNEL);
574 if (!tcon)
575 goto out;
576
577 length = -EINVAL;
578 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
579 goto out2;
580
581 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
582 if (length < 0)
583 goto out2;
584 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
585 if (length < 0)
586 goto out2;
587
588 length = security_compute_av(ssid, tsid, tclass, req, &avd);
589 if (length < 0)
590 goto out2;
591
592 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
593 "%x %x %x %x %u",
594 avd.allowed, avd.decided,
595 avd.auditallow, avd.auditdeny,
596 avd.seqno);
597 out2:
598 kfree(tcon);
599 out:
600 kfree(scon);
601 return length;
602 }
603
604 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
605 {
606 char *scon, *tcon;
607 u32 ssid, tsid, newsid;
608 u16 tclass;
609 ssize_t length;
610 char *newcon;
611 u32 len;
612
613 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
614 if (length)
615 return length;
616
617 length = -ENOMEM;
618 scon = kzalloc(size+1, GFP_KERNEL);
619 if (!scon)
620 return length;
621
622 tcon = kzalloc(size+1, GFP_KERNEL);
623 if (!tcon)
624 goto out;
625
626 length = -EINVAL;
627 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
628 goto out2;
629
630 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
631 if (length < 0)
632 goto out2;
633 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
634 if (length < 0)
635 goto out2;
636
637 length = security_transition_sid(ssid, tsid, tclass, &newsid);
638 if (length < 0)
639 goto out2;
640
641 length = security_sid_to_context(newsid, &newcon, &len);
642 if (length < 0)
643 goto out2;
644
645 if (len > SIMPLE_TRANSACTION_LIMIT) {
646 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
647 "payload max\n", __func__, len);
648 length = -ERANGE;
649 goto out3;
650 }
651
652 memcpy(buf, newcon, len);
653 length = len;
654 out3:
655 kfree(newcon);
656 out2:
657 kfree(tcon);
658 out:
659 kfree(scon);
660 return length;
661 }
662
663 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
664 {
665 char *scon, *tcon;
666 u32 ssid, tsid, newsid;
667 u16 tclass;
668 ssize_t length;
669 char *newcon;
670 u32 len;
671
672 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
673 if (length)
674 return length;
675
676 length = -ENOMEM;
677 scon = kzalloc(size+1, GFP_KERNEL);
678 if (!scon)
679 return length;
680
681 tcon = kzalloc(size+1, GFP_KERNEL);
682 if (!tcon)
683 goto out;
684
685 length = -EINVAL;
686 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
687 goto out2;
688
689 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
690 if (length < 0)
691 goto out2;
692 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
693 if (length < 0)
694 goto out2;
695
696 length = security_change_sid(ssid, tsid, tclass, &newsid);
697 if (length < 0)
698 goto out2;
699
700 length = security_sid_to_context(newsid, &newcon, &len);
701 if (length < 0)
702 goto out2;
703
704 if (len > SIMPLE_TRANSACTION_LIMIT) {
705 length = -ERANGE;
706 goto out3;
707 }
708
709 memcpy(buf, newcon, len);
710 length = len;
711 out3:
712 kfree(newcon);
713 out2:
714 kfree(tcon);
715 out:
716 kfree(scon);
717 return length;
718 }
719
720 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
721 {
722 char *con, *user, *ptr;
723 u32 sid, *sids;
724 ssize_t length;
725 char *newcon;
726 int i, rc;
727 u32 len, nsids;
728
729 length = task_has_security(current, SECURITY__COMPUTE_USER);
730 if (length)
731 return length;
732
733 length = -ENOMEM;
734 con = kzalloc(size+1, GFP_KERNEL);
735 if (!con)
736 return length;
737
738 user = kzalloc(size+1, GFP_KERNEL);
739 if (!user)
740 goto out;
741
742 length = -EINVAL;
743 if (sscanf(buf, "%s %s", con, user) != 2)
744 goto out2;
745
746 length = security_context_to_sid(con, strlen(con)+1, &sid);
747 if (length < 0)
748 goto out2;
749
750 length = security_get_user_sids(sid, user, &sids, &nsids);
751 if (length < 0)
752 goto out2;
753
754 length = sprintf(buf, "%u", nsids) + 1;
755 ptr = buf + length;
756 for (i = 0; i < nsids; i++) {
757 rc = security_sid_to_context(sids[i], &newcon, &len);
758 if (rc) {
759 length = rc;
760 goto out3;
761 }
762 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
763 kfree(newcon);
764 length = -ERANGE;
765 goto out3;
766 }
767 memcpy(ptr, newcon, len);
768 kfree(newcon);
769 ptr += len;
770 length += len;
771 }
772 out3:
773 kfree(sids);
774 out2:
775 kfree(user);
776 out:
777 kfree(con);
778 return length;
779 }
780
781 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
782 {
783 char *scon, *tcon;
784 u32 ssid, tsid, newsid;
785 u16 tclass;
786 ssize_t length;
787 char *newcon;
788 u32 len;
789
790 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
791 if (length)
792 return length;
793
794 length = -ENOMEM;
795 scon = kzalloc(size+1, GFP_KERNEL);
796 if (!scon)
797 return length;
798
799 tcon = kzalloc(size+1, GFP_KERNEL);
800 if (!tcon)
801 goto out;
802
803 length = -EINVAL;
804 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
805 goto out2;
806
807 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
808 if (length < 0)
809 goto out2;
810 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
811 if (length < 0)
812 goto out2;
813
814 length = security_member_sid(ssid, tsid, tclass, &newsid);
815 if (length < 0)
816 goto out2;
817
818 length = security_sid_to_context(newsid, &newcon, &len);
819 if (length < 0)
820 goto out2;
821
822 if (len > SIMPLE_TRANSACTION_LIMIT) {
823 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
824 "payload max\n", __func__, len);
825 length = -ERANGE;
826 goto out3;
827 }
828
829 memcpy(buf, newcon, len);
830 length = len;
831 out3:
832 kfree(newcon);
833 out2:
834 kfree(tcon);
835 out:
836 kfree(scon);
837 return length;
838 }
839
840 static struct inode *sel_make_inode(struct super_block *sb, int mode)
841 {
842 struct inode *ret = new_inode(sb);
843
844 if (ret) {
845 ret->i_mode = mode;
846 ret->i_uid = ret->i_gid = 0;
847 ret->i_blocks = 0;
848 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
849 }
850 return ret;
851 }
852
853 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
854 size_t count, loff_t *ppos)
855 {
856 char *page = NULL;
857 ssize_t length;
858 ssize_t ret;
859 int cur_enforcing;
860 struct inode *inode = filep->f_path.dentry->d_inode;
861 unsigned index = inode->i_ino & SEL_INO_MASK;
862 const char *name = filep->f_path.dentry->d_name.name;
863
864 mutex_lock(&sel_mutex);
865
866 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
867 ret = -EINVAL;
868 goto out;
869 }
870
871 if (count > PAGE_SIZE) {
872 ret = -EINVAL;
873 goto out;
874 }
875 page = (char *)get_zeroed_page(GFP_KERNEL);
876 if (!page) {
877 ret = -ENOMEM;
878 goto out;
879 }
880
881 cur_enforcing = security_get_bool_value(index);
882 if (cur_enforcing < 0) {
883 ret = cur_enforcing;
884 goto out;
885 }
886 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
887 bool_pending_values[index]);
888 ret = simple_read_from_buffer(buf, count, ppos, page, length);
889 out:
890 mutex_unlock(&sel_mutex);
891 if (page)
892 free_page((unsigned long)page);
893 return ret;
894 }
895
896 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
897 size_t count, loff_t *ppos)
898 {
899 char *page = NULL;
900 ssize_t length;
901 int new_value;
902 struct inode *inode = filep->f_path.dentry->d_inode;
903 unsigned index = inode->i_ino & SEL_INO_MASK;
904 const char *name = filep->f_path.dentry->d_name.name;
905
906 mutex_lock(&sel_mutex);
907
908 length = task_has_security(current, SECURITY__SETBOOL);
909 if (length)
910 goto out;
911
912 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
913 length = -EINVAL;
914 goto out;
915 }
916
917 if (count >= PAGE_SIZE) {
918 length = -ENOMEM;
919 goto out;
920 }
921
922 if (*ppos != 0) {
923 /* No partial writes. */
924 length = -EINVAL;
925 goto out;
926 }
927 page = (char *)get_zeroed_page(GFP_KERNEL);
928 if (!page) {
929 length = -ENOMEM;
930 goto out;
931 }
932
933 length = -EFAULT;
934 if (copy_from_user(page, buf, count))
935 goto out;
936
937 length = -EINVAL;
938 if (sscanf(page, "%d", &new_value) != 1)
939 goto out;
940
941 if (new_value)
942 new_value = 1;
943
944 bool_pending_values[index] = new_value;
945 length = count;
946
947 out:
948 mutex_unlock(&sel_mutex);
949 if (page)
950 free_page((unsigned long) page);
951 return length;
952 }
953
954 static const struct file_operations sel_bool_ops = {
955 .read = sel_read_bool,
956 .write = sel_write_bool,
957 };
958
959 static ssize_t sel_commit_bools_write(struct file *filep,
960 const char __user *buf,
961 size_t count, loff_t *ppos)
962 {
963 char *page = NULL;
964 ssize_t length;
965 int new_value;
966
967 mutex_lock(&sel_mutex);
968
969 length = task_has_security(current, SECURITY__SETBOOL);
970 if (length)
971 goto out;
972
973 if (count >= PAGE_SIZE) {
974 length = -ENOMEM;
975 goto out;
976 }
977 if (*ppos != 0) {
978 /* No partial writes. */
979 goto out;
980 }
981 page = (char *)get_zeroed_page(GFP_KERNEL);
982 if (!page) {
983 length = -ENOMEM;
984 goto out;
985 }
986
987 length = -EFAULT;
988 if (copy_from_user(page, buf, count))
989 goto out;
990
991 length = -EINVAL;
992 if (sscanf(page, "%d", &new_value) != 1)
993 goto out;
994
995 if (new_value && bool_pending_values)
996 security_set_bools(bool_num, bool_pending_values);
997
998 length = count;
999
1000 out:
1001 mutex_unlock(&sel_mutex);
1002 if (page)
1003 free_page((unsigned long) page);
1004 return length;
1005 }
1006
1007 static const struct file_operations sel_commit_bools_ops = {
1008 .write = sel_commit_bools_write,
1009 };
1010
1011 static void sel_remove_entries(struct dentry *de)
1012 {
1013 struct list_head *node;
1014
1015 spin_lock(&dcache_lock);
1016 node = de->d_subdirs.next;
1017 while (node != &de->d_subdirs) {
1018 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1019 list_del_init(node);
1020
1021 if (d->d_inode) {
1022 d = dget_locked(d);
1023 spin_unlock(&dcache_lock);
1024 d_delete(d);
1025 simple_unlink(de->d_inode, d);
1026 dput(d);
1027 spin_lock(&dcache_lock);
1028 }
1029 node = de->d_subdirs.next;
1030 }
1031
1032 spin_unlock(&dcache_lock);
1033 }
1034
1035 #define BOOL_DIR_NAME "booleans"
1036
1037 static int sel_make_bools(void)
1038 {
1039 int i, ret = 0;
1040 ssize_t len;
1041 struct dentry *dentry = NULL;
1042 struct dentry *dir = bool_dir;
1043 struct inode *inode = NULL;
1044 struct inode_security_struct *isec;
1045 char **names = NULL, *page;
1046 int num;
1047 int *values = NULL;
1048 u32 sid;
1049
1050 /* remove any existing files */
1051 kfree(bool_pending_names);
1052 kfree(bool_pending_values);
1053 bool_pending_names = NULL;
1054 bool_pending_values = NULL;
1055
1056 sel_remove_entries(dir);
1057
1058 page = (char *)get_zeroed_page(GFP_KERNEL);
1059 if (!page)
1060 return -ENOMEM;
1061
1062 ret = security_get_bools(&num, &names, &values);
1063 if (ret != 0)
1064 goto out;
1065
1066 for (i = 0; i < num; i++) {
1067 dentry = d_alloc_name(dir, names[i]);
1068 if (!dentry) {
1069 ret = -ENOMEM;
1070 goto err;
1071 }
1072 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1073 if (!inode) {
1074 ret = -ENOMEM;
1075 goto err;
1076 }
1077
1078 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1079 if (len < 0) {
1080 ret = -EINVAL;
1081 goto err;
1082 } else if (len >= PAGE_SIZE) {
1083 ret = -ENAMETOOLONG;
1084 goto err;
1085 }
1086 isec = (struct inode_security_struct *)inode->i_security;
1087 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1088 if (ret)
1089 goto err;
1090 isec->sid = sid;
1091 isec->initialized = 1;
1092 inode->i_fop = &sel_bool_ops;
1093 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1094 d_add(dentry, inode);
1095 }
1096 bool_num = num;
1097 bool_pending_names = names;
1098 bool_pending_values = values;
1099 out:
1100 free_page((unsigned long)page);
1101 return ret;
1102 err:
1103 if (names) {
1104 for (i = 0; i < num; i++)
1105 kfree(names[i]);
1106 kfree(names);
1107 }
1108 kfree(values);
1109 sel_remove_entries(dir);
1110 ret = -ENOMEM;
1111 goto out;
1112 }
1113
1114 #define NULL_FILE_NAME "null"
1115
1116 struct dentry *selinux_null;
1117
1118 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1119 size_t count, loff_t *ppos)
1120 {
1121 char tmpbuf[TMPBUFLEN];
1122 ssize_t length;
1123
1124 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1125 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1126 }
1127
1128 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1129 const char __user *buf,
1130 size_t count, loff_t *ppos)
1131
1132 {
1133 char *page;
1134 ssize_t ret;
1135 int new_value;
1136
1137 if (count >= PAGE_SIZE) {
1138 ret = -ENOMEM;
1139 goto out;
1140 }
1141
1142 if (*ppos != 0) {
1143 /* No partial writes. */
1144 ret = -EINVAL;
1145 goto out;
1146 }
1147
1148 page = (char *)get_zeroed_page(GFP_KERNEL);
1149 if (!page) {
1150 ret = -ENOMEM;
1151 goto out;
1152 }
1153
1154 if (copy_from_user(page, buf, count)) {
1155 ret = -EFAULT;
1156 goto out_free;
1157 }
1158
1159 if (sscanf(page, "%u", &new_value) != 1) {
1160 ret = -EINVAL;
1161 goto out;
1162 }
1163
1164 if (new_value != avc_cache_threshold) {
1165 ret = task_has_security(current, SECURITY__SETSECPARAM);
1166 if (ret)
1167 goto out_free;
1168 avc_cache_threshold = new_value;
1169 }
1170 ret = count;
1171 out_free:
1172 free_page((unsigned long)page);
1173 out:
1174 return ret;
1175 }
1176
1177 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1178 size_t count, loff_t *ppos)
1179 {
1180 char *page;
1181 ssize_t ret = 0;
1182
1183 page = (char *)__get_free_page(GFP_KERNEL);
1184 if (!page) {
1185 ret = -ENOMEM;
1186 goto out;
1187 }
1188 ret = avc_get_hash_stats(page);
1189 if (ret >= 0)
1190 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1191 free_page((unsigned long)page);
1192 out:
1193 return ret;
1194 }
1195
1196 static const struct file_operations sel_avc_cache_threshold_ops = {
1197 .read = sel_read_avc_cache_threshold,
1198 .write = sel_write_avc_cache_threshold,
1199 };
1200
1201 static const struct file_operations sel_avc_hash_stats_ops = {
1202 .read = sel_read_avc_hash_stats,
1203 };
1204
1205 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1206 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1207 {
1208 int cpu;
1209
1210 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1211 if (!cpu_possible(cpu))
1212 continue;
1213 *idx = cpu + 1;
1214 return &per_cpu(avc_cache_stats, cpu);
1215 }
1216 return NULL;
1217 }
1218
1219 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1220 {
1221 loff_t n = *pos - 1;
1222
1223 if (*pos == 0)
1224 return SEQ_START_TOKEN;
1225
1226 return sel_avc_get_stat_idx(&n);
1227 }
1228
1229 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1230 {
1231 return sel_avc_get_stat_idx(pos);
1232 }
1233
1234 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1235 {
1236 struct avc_cache_stats *st = v;
1237
1238 if (v == SEQ_START_TOKEN)
1239 seq_printf(seq, "lookups hits misses allocations reclaims "
1240 "frees\n");
1241 else
1242 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1243 st->hits, st->misses, st->allocations,
1244 st->reclaims, st->frees);
1245 return 0;
1246 }
1247
1248 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1249 { }
1250
1251 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1252 .start = sel_avc_stats_seq_start,
1253 .next = sel_avc_stats_seq_next,
1254 .show = sel_avc_stats_seq_show,
1255 .stop = sel_avc_stats_seq_stop,
1256 };
1257
1258 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1259 {
1260 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1261 }
1262
1263 static const struct file_operations sel_avc_cache_stats_ops = {
1264 .open = sel_open_avc_cache_stats,
1265 .read = seq_read,
1266 .llseek = seq_lseek,
1267 .release = seq_release,
1268 };
1269 #endif
1270
1271 static int sel_make_avc_files(struct dentry *dir)
1272 {
1273 int i, ret = 0;
1274 static struct tree_descr files[] = {
1275 { "cache_threshold",
1276 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1277 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1278 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1279 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1280 #endif
1281 };
1282
1283 for (i = 0; i < ARRAY_SIZE(files); i++) {
1284 struct inode *inode;
1285 struct dentry *dentry;
1286
1287 dentry = d_alloc_name(dir, files[i].name);
1288 if (!dentry) {
1289 ret = -ENOMEM;
1290 goto out;
1291 }
1292
1293 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1294 if (!inode) {
1295 ret = -ENOMEM;
1296 goto out;
1297 }
1298 inode->i_fop = files[i].ops;
1299 inode->i_ino = ++sel_last_ino;
1300 d_add(dentry, inode);
1301 }
1302 out:
1303 return ret;
1304 }
1305
1306 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1307 size_t count, loff_t *ppos)
1308 {
1309 struct inode *inode;
1310 char *con;
1311 u32 sid, len;
1312 ssize_t ret;
1313
1314 inode = file->f_path.dentry->d_inode;
1315 sid = inode->i_ino&SEL_INO_MASK;
1316 ret = security_sid_to_context(sid, &con, &len);
1317 if (ret < 0)
1318 return ret;
1319
1320 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1321 kfree(con);
1322 return ret;
1323 }
1324
1325 static const struct file_operations sel_initcon_ops = {
1326 .read = sel_read_initcon,
1327 };
1328
1329 static int sel_make_initcon_files(struct dentry *dir)
1330 {
1331 int i, ret = 0;
1332
1333 for (i = 1; i <= SECINITSID_NUM; i++) {
1334 struct inode *inode;
1335 struct dentry *dentry;
1336 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1337 if (!dentry) {
1338 ret = -ENOMEM;
1339 goto out;
1340 }
1341
1342 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1343 if (!inode) {
1344 ret = -ENOMEM;
1345 goto out;
1346 }
1347 inode->i_fop = &sel_initcon_ops;
1348 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1349 d_add(dentry, inode);
1350 }
1351 out:
1352 return ret;
1353 }
1354
1355 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1356 {
1357 return a / b - (a % b < 0);
1358 }
1359
1360 static inline unsigned long sel_class_to_ino(u16 class)
1361 {
1362 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1363 }
1364
1365 static inline u16 sel_ino_to_class(unsigned long ino)
1366 {
1367 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1368 }
1369
1370 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1371 {
1372 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1373 }
1374
1375 static inline u32 sel_ino_to_perm(unsigned long ino)
1376 {
1377 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1378 }
1379
1380 static ssize_t sel_read_class(struct file *file, char __user *buf,
1381 size_t count, loff_t *ppos)
1382 {
1383 ssize_t rc, len;
1384 char *page;
1385 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1386
1387 page = (char *)__get_free_page(GFP_KERNEL);
1388 if (!page) {
1389 rc = -ENOMEM;
1390 goto out;
1391 }
1392
1393 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1394 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1395 free_page((unsigned long)page);
1396 out:
1397 return rc;
1398 }
1399
1400 static const struct file_operations sel_class_ops = {
1401 .read = sel_read_class,
1402 };
1403
1404 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1405 size_t count, loff_t *ppos)
1406 {
1407 ssize_t rc, len;
1408 char *page;
1409 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1410
1411 page = (char *)__get_free_page(GFP_KERNEL);
1412 if (!page) {
1413 rc = -ENOMEM;
1414 goto out;
1415 }
1416
1417 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1418 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1419 free_page((unsigned long)page);
1420 out:
1421 return rc;
1422 }
1423
1424 static const struct file_operations sel_perm_ops = {
1425 .read = sel_read_perm,
1426 };
1427
1428 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1429 size_t count, loff_t *ppos)
1430 {
1431 int value;
1432 char tmpbuf[TMPBUFLEN];
1433 ssize_t length;
1434 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1435
1436 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1437 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1438
1439 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1440 }
1441
1442 static const struct file_operations sel_policycap_ops = {
1443 .read = sel_read_policycap,
1444 };
1445
1446 static int sel_make_perm_files(char *objclass, int classvalue,
1447 struct dentry *dir)
1448 {
1449 int i, rc = 0, nperms;
1450 char **perms;
1451
1452 rc = security_get_permissions(objclass, &perms, &nperms);
1453 if (rc)
1454 goto out;
1455
1456 for (i = 0; i < nperms; i++) {
1457 struct inode *inode;
1458 struct dentry *dentry;
1459
1460 dentry = d_alloc_name(dir, perms[i]);
1461 if (!dentry) {
1462 rc = -ENOMEM;
1463 goto out1;
1464 }
1465
1466 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1467 if (!inode) {
1468 rc = -ENOMEM;
1469 goto out1;
1470 }
1471 inode->i_fop = &sel_perm_ops;
1472 /* i+1 since perm values are 1-indexed */
1473 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1474 d_add(dentry, inode);
1475 }
1476
1477 out1:
1478 for (i = 0; i < nperms; i++)
1479 kfree(perms[i]);
1480 kfree(perms);
1481 out:
1482 return rc;
1483 }
1484
1485 static int sel_make_class_dir_entries(char *classname, int index,
1486 struct dentry *dir)
1487 {
1488 struct dentry *dentry = NULL;
1489 struct inode *inode = NULL;
1490 int rc;
1491
1492 dentry = d_alloc_name(dir, "index");
1493 if (!dentry) {
1494 rc = -ENOMEM;
1495 goto out;
1496 }
1497
1498 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1499 if (!inode) {
1500 rc = -ENOMEM;
1501 goto out;
1502 }
1503
1504 inode->i_fop = &sel_class_ops;
1505 inode->i_ino = sel_class_to_ino(index);
1506 d_add(dentry, inode);
1507
1508 dentry = d_alloc_name(dir, "perms");
1509 if (!dentry) {
1510 rc = -ENOMEM;
1511 goto out;
1512 }
1513
1514 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1515 if (rc)
1516 goto out;
1517
1518 rc = sel_make_perm_files(classname, index, dentry);
1519
1520 out:
1521 return rc;
1522 }
1523
1524 static void sel_remove_classes(void)
1525 {
1526 struct list_head *class_node;
1527
1528 list_for_each(class_node, &class_dir->d_subdirs) {
1529 struct dentry *class_subdir = list_entry(class_node,
1530 struct dentry, d_u.d_child);
1531 struct list_head *class_subdir_node;
1532
1533 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1534 struct dentry *d = list_entry(class_subdir_node,
1535 struct dentry, d_u.d_child);
1536
1537 if (d->d_inode)
1538 if (d->d_inode->i_mode & S_IFDIR)
1539 sel_remove_entries(d);
1540 }
1541
1542 sel_remove_entries(class_subdir);
1543 }
1544
1545 sel_remove_entries(class_dir);
1546 }
1547
1548 static int sel_make_classes(void)
1549 {
1550 int rc = 0, nclasses, i;
1551 char **classes;
1552
1553 /* delete any existing entries */
1554 sel_remove_classes();
1555
1556 rc = security_get_classes(&classes, &nclasses);
1557 if (rc < 0)
1558 goto out;
1559
1560 /* +2 since classes are 1-indexed */
1561 last_class_ino = sel_class_to_ino(nclasses+2);
1562
1563 for (i = 0; i < nclasses; i++) {
1564 struct dentry *class_name_dir;
1565
1566 class_name_dir = d_alloc_name(class_dir, classes[i]);
1567 if (!class_name_dir) {
1568 rc = -ENOMEM;
1569 goto out1;
1570 }
1571
1572 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1573 &last_class_ino);
1574 if (rc)
1575 goto out1;
1576
1577 /* i+1 since class values are 1-indexed */
1578 rc = sel_make_class_dir_entries(classes[i], i+1,
1579 class_name_dir);
1580 if (rc)
1581 goto out1;
1582 }
1583
1584 out1:
1585 for (i = 0; i < nclasses; i++)
1586 kfree(classes[i]);
1587 kfree(classes);
1588 out:
1589 return rc;
1590 }
1591
1592 static int sel_make_policycap(void)
1593 {
1594 unsigned int iter;
1595 struct dentry *dentry = NULL;
1596 struct inode *inode = NULL;
1597
1598 sel_remove_entries(policycap_dir);
1599
1600 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1601 if (iter < ARRAY_SIZE(policycap_names))
1602 dentry = d_alloc_name(policycap_dir,
1603 policycap_names[iter]);
1604 else
1605 dentry = d_alloc_name(policycap_dir, "unknown");
1606
1607 if (dentry == NULL)
1608 return -ENOMEM;
1609
1610 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1611 if (inode == NULL)
1612 return -ENOMEM;
1613
1614 inode->i_fop = &sel_policycap_ops;
1615 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1616 d_add(dentry, inode);
1617 }
1618
1619 return 0;
1620 }
1621
1622 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1623 unsigned long *ino)
1624 {
1625 int ret = 0;
1626 struct inode *inode;
1627
1628 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1629 if (!inode) {
1630 ret = -ENOMEM;
1631 goto out;
1632 }
1633 inode->i_op = &simple_dir_inode_operations;
1634 inode->i_fop = &simple_dir_operations;
1635 inode->i_ino = ++(*ino);
1636 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1637 inc_nlink(inode);
1638 d_add(dentry, inode);
1639 /* bump link count on parent directory, too */
1640 inc_nlink(dir);
1641 out:
1642 return ret;
1643 }
1644
1645 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1646 {
1647 int ret;
1648 struct dentry *dentry;
1649 struct inode *inode, *root_inode;
1650 struct inode_security_struct *isec;
1651
1652 static struct tree_descr selinux_files[] = {
1653 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1654 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1655 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1656 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1657 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1658 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1659 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1660 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1661 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1662 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1663 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1664 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1665 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1666 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1667 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1668 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1669 /* last one */ {""}
1670 };
1671 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1672 if (ret)
1673 goto err;
1674
1675 root_inode = sb->s_root->d_inode;
1676
1677 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1678 if (!dentry) {
1679 ret = -ENOMEM;
1680 goto err;
1681 }
1682
1683 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1684 if (ret)
1685 goto err;
1686
1687 bool_dir = dentry;
1688
1689 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1690 if (!dentry) {
1691 ret = -ENOMEM;
1692 goto err;
1693 }
1694
1695 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1696 if (!inode) {
1697 ret = -ENOMEM;
1698 goto err;
1699 }
1700 inode->i_ino = ++sel_last_ino;
1701 isec = (struct inode_security_struct *)inode->i_security;
1702 isec->sid = SECINITSID_DEVNULL;
1703 isec->sclass = SECCLASS_CHR_FILE;
1704 isec->initialized = 1;
1705
1706 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1707 d_add(dentry, inode);
1708 selinux_null = dentry;
1709
1710 dentry = d_alloc_name(sb->s_root, "avc");
1711 if (!dentry) {
1712 ret = -ENOMEM;
1713 goto err;
1714 }
1715
1716 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1717 if (ret)
1718 goto err;
1719
1720 ret = sel_make_avc_files(dentry);
1721 if (ret)
1722 goto err;
1723
1724 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1725 if (!dentry) {
1726 ret = -ENOMEM;
1727 goto err;
1728 }
1729
1730 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1731 if (ret)
1732 goto err;
1733
1734 ret = sel_make_initcon_files(dentry);
1735 if (ret)
1736 goto err;
1737
1738 dentry = d_alloc_name(sb->s_root, "class");
1739 if (!dentry) {
1740 ret = -ENOMEM;
1741 goto err;
1742 }
1743
1744 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1745 if (ret)
1746 goto err;
1747
1748 class_dir = dentry;
1749
1750 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1751 if (!dentry) {
1752 ret = -ENOMEM;
1753 goto err;
1754 }
1755
1756 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1757 if (ret)
1758 goto err;
1759
1760 policycap_dir = dentry;
1761
1762 out:
1763 return ret;
1764 err:
1765 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1766 __func__);
1767 goto out;
1768 }
1769
1770 static int sel_get_sb(struct file_system_type *fs_type,
1771 int flags, const char *dev_name, void *data,
1772 struct vfsmount *mnt)
1773 {
1774 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1775 }
1776
1777 static struct file_system_type sel_fs_type = {
1778 .name = "selinuxfs",
1779 .get_sb = sel_get_sb,
1780 .kill_sb = kill_litter_super,
1781 };
1782
1783 struct vfsmount *selinuxfs_mount;
1784
1785 static int __init init_sel_fs(void)
1786 {
1787 int err;
1788
1789 if (!selinux_enabled)
1790 return 0;
1791 err = register_filesystem(&sel_fs_type);
1792 if (!err) {
1793 selinuxfs_mount = kern_mount(&sel_fs_type);
1794 if (IS_ERR(selinuxfs_mount)) {
1795 printk(KERN_ERR "selinuxfs: could not mount!\n");
1796 err = PTR_ERR(selinuxfs_mount);
1797 selinuxfs_mount = NULL;
1798 }
1799 }
1800 return err;
1801 }
1802
1803 __initcall(init_sel_fs);
1804
1805 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1806 void exit_sel_fs(void)
1807 {
1808 unregister_filesystem(&sel_fs_type);
1809 }
1810 #endif
Support for the Chinese Samsung S3C2440 based development boards