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selinux: use generic_file_llseek
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / security / selinux / selinuxfs.c
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul.moore@hp.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31
32 /* selinuxfs pseudo filesystem for exporting the security policy API.
33 Based on the proc code and the fs/nfsd/nfsctl.c code. */
34
35 #include "flask.h"
36 #include "avc.h"
37 #include "avc_ss.h"
38 #include "security.h"
39 #include "objsec.h"
40 #include "conditional.h"
41
42 /* Policy capability filenames */
43 static char *policycap_names[] = {
44 "network_peer_controls",
45 "open_perms"
46 };
47
48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
49
50 static int __init checkreqprot_setup(char *str)
51 {
52 unsigned long checkreqprot;
53 if (!strict_strtoul(str, 0, &checkreqprot))
54 selinux_checkreqprot = checkreqprot ? 1 : 0;
55 return 1;
56 }
57 __setup("checkreqprot=", checkreqprot_setup);
58
59 static DEFINE_MUTEX(sel_mutex);
60
61 /* global data for booleans */
62 static struct dentry *bool_dir;
63 static int bool_num;
64 static char **bool_pending_names;
65 static int *bool_pending_values;
66
67 /* global data for classes */
68 static struct dentry *class_dir;
69 static unsigned long last_class_ino;
70
71 /* global data for policy capabilities */
72 static struct dentry *policycap_dir;
73
74 extern void selnl_notify_setenforce(int val);
75
76 /* Check whether a task is allowed to use a security operation. */
77 static int task_has_security(struct task_struct *tsk,
78 u32 perms)
79 {
80 const struct task_security_struct *tsec;
81 u32 sid = 0;
82
83 rcu_read_lock();
84 tsec = __task_cred(tsk)->security;
85 if (tsec)
86 sid = tsec->sid;
87 rcu_read_unlock();
88 if (!tsec)
89 return -EACCES;
90
91 return avc_has_perm(sid, SECINITSID_SECURITY,
92 SECCLASS_SECURITY, perms, NULL);
93 }
94
95 enum sel_inos {
96 SEL_ROOT_INO = 2,
97 SEL_LOAD, /* load policy */
98 SEL_ENFORCE, /* get or set enforcing status */
99 SEL_CONTEXT, /* validate context */
100 SEL_ACCESS, /* compute access decision */
101 SEL_CREATE, /* compute create labeling decision */
102 SEL_RELABEL, /* compute relabeling decision */
103 SEL_USER, /* compute reachable user contexts */
104 SEL_POLICYVERS, /* return policy version for this kernel */
105 SEL_COMMIT_BOOLS, /* commit new boolean values */
106 SEL_MLS, /* return if MLS policy is enabled */
107 SEL_DISABLE, /* disable SELinux until next reboot */
108 SEL_MEMBER, /* compute polyinstantiation membership decision */
109 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
110 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
111 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
112 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
113 SEL_INO_NEXT, /* The next inode number to use */
114 };
115
116 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
117
118 #define SEL_INITCON_INO_OFFSET 0x01000000
119 #define SEL_BOOL_INO_OFFSET 0x02000000
120 #define SEL_CLASS_INO_OFFSET 0x04000000
121 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
122 #define SEL_INO_MASK 0x00ffffff
123
124 #define TMPBUFLEN 12
125 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
126 size_t count, loff_t *ppos)
127 {
128 char tmpbuf[TMPBUFLEN];
129 ssize_t length;
130
131 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
132 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
133 }
134
135 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
136 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
137 size_t count, loff_t *ppos)
138
139 {
140 char *page;
141 ssize_t length;
142 int new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146 if (*ppos != 0) {
147 /* No partial writes. */
148 return -EINVAL;
149 }
150 page = (char *)get_zeroed_page(GFP_KERNEL);
151 if (!page)
152 return -ENOMEM;
153 length = -EFAULT;
154 if (copy_from_user(page, buf, count))
155 goto out;
156
157 length = -EINVAL;
158 if (sscanf(page, "%d", &new_value) != 1)
159 goto out;
160
161 if (new_value != selinux_enforcing) {
162 length = task_has_security(current, SECURITY__SETENFORCE);
163 if (length)
164 goto out;
165 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
166 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
167 new_value, selinux_enforcing,
168 audit_get_loginuid(current),
169 audit_get_sessionid(current));
170 selinux_enforcing = new_value;
171 if (selinux_enforcing)
172 avc_ss_reset(0);
173 selnl_notify_setenforce(selinux_enforcing);
174 }
175 length = count;
176 out:
177 free_page((unsigned long) page);
178 return length;
179 }
180 #else
181 #define sel_write_enforce NULL
182 #endif
183
184 static const struct file_operations sel_enforce_ops = {
185 .read = sel_read_enforce,
186 .write = sel_write_enforce,
187 .llseek = generic_file_llseek,
188 };
189
190 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
191 size_t count, loff_t *ppos)
192 {
193 char tmpbuf[TMPBUFLEN];
194 ssize_t length;
195 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
196 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
197 security_get_reject_unknown() : !security_get_allow_unknown();
198
199 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
200 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
201 }
202
203 static const struct file_operations sel_handle_unknown_ops = {
204 .read = sel_read_handle_unknown,
205 .llseek = generic_file_llseek,
206 };
207
208 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
209 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
210 size_t count, loff_t *ppos)
211
212 {
213 char *page;
214 ssize_t length;
215 int new_value;
216 extern int selinux_disable(void);
217
218 if (count >= PAGE_SIZE)
219 return -ENOMEM;
220 if (*ppos != 0) {
221 /* No partial writes. */
222 return -EINVAL;
223 }
224 page = (char *)get_zeroed_page(GFP_KERNEL);
225 if (!page)
226 return -ENOMEM;
227 length = -EFAULT;
228 if (copy_from_user(page, buf, count))
229 goto out;
230
231 length = -EINVAL;
232 if (sscanf(page, "%d", &new_value) != 1)
233 goto out;
234
235 if (new_value) {
236 length = selinux_disable();
237 if (length < 0)
238 goto out;
239 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
240 "selinux=0 auid=%u ses=%u",
241 audit_get_loginuid(current),
242 audit_get_sessionid(current));
243 }
244
245 length = count;
246 out:
247 free_page((unsigned long) page);
248 return length;
249 }
250 #else
251 #define sel_write_disable NULL
252 #endif
253
254 static const struct file_operations sel_disable_ops = {
255 .write = sel_write_disable,
256 .llseek = generic_file_llseek,
257 };
258
259 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
260 size_t count, loff_t *ppos)
261 {
262 char tmpbuf[TMPBUFLEN];
263 ssize_t length;
264
265 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
266 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
267 }
268
269 static const struct file_operations sel_policyvers_ops = {
270 .read = sel_read_policyvers,
271 .llseek = generic_file_llseek,
272 };
273
274 /* declaration for sel_write_load */
275 static int sel_make_bools(void);
276 static int sel_make_classes(void);
277 static int sel_make_policycap(void);
278
279 /* declaration for sel_make_class_dirs */
280 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
281 unsigned long *ino);
282
283 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
284 size_t count, loff_t *ppos)
285 {
286 char tmpbuf[TMPBUFLEN];
287 ssize_t length;
288
289 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
290 security_mls_enabled());
291 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
292 }
293
294 static const struct file_operations sel_mls_ops = {
295 .read = sel_read_mls,
296 .llseek = generic_file_llseek,
297 };
298
299 static ssize_t sel_write_load(struct file *file, const char __user *buf,
300 size_t count, loff_t *ppos)
301
302 {
303 int ret;
304 ssize_t length;
305 void *data = NULL;
306
307 mutex_lock(&sel_mutex);
308
309 length = task_has_security(current, SECURITY__LOAD_POLICY);
310 if (length)
311 goto out;
312
313 if (*ppos != 0) {
314 /* No partial writes. */
315 length = -EINVAL;
316 goto out;
317 }
318
319 if ((count > 64 * 1024 * 1024)
320 || (data = vmalloc(count)) == NULL) {
321 length = -ENOMEM;
322 goto out;
323 }
324
325 length = -EFAULT;
326 if (copy_from_user(data, buf, count) != 0)
327 goto out;
328
329 length = security_load_policy(data, count);
330 if (length)
331 goto out;
332
333 ret = sel_make_bools();
334 if (ret) {
335 length = ret;
336 goto out1;
337 }
338
339 ret = sel_make_classes();
340 if (ret) {
341 length = ret;
342 goto out1;
343 }
344
345 ret = sel_make_policycap();
346 if (ret)
347 length = ret;
348 else
349 length = count;
350
351 out1:
352 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
353 "policy loaded auid=%u ses=%u",
354 audit_get_loginuid(current),
355 audit_get_sessionid(current));
356 out:
357 mutex_unlock(&sel_mutex);
358 vfree(data);
359 return length;
360 }
361
362 static const struct file_operations sel_load_ops = {
363 .write = sel_write_load,
364 .llseek = generic_file_llseek,
365 };
366
367 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
368 {
369 char *canon;
370 u32 sid, len;
371 ssize_t length;
372
373 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
374 if (length)
375 return length;
376
377 length = security_context_to_sid(buf, size, &sid);
378 if (length < 0)
379 return length;
380
381 length = security_sid_to_context(sid, &canon, &len);
382 if (length < 0)
383 return length;
384
385 if (len > SIMPLE_TRANSACTION_LIMIT) {
386 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
387 "payload max\n", __func__, len);
388 length = -ERANGE;
389 goto out;
390 }
391
392 memcpy(buf, canon, len);
393 length = len;
394 out:
395 kfree(canon);
396 return length;
397 }
398
399 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
400 size_t count, loff_t *ppos)
401 {
402 char tmpbuf[TMPBUFLEN];
403 ssize_t length;
404
405 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
406 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
407 }
408
409 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
410 size_t count, loff_t *ppos)
411 {
412 char *page;
413 ssize_t length;
414 unsigned int new_value;
415
416 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
417 if (length)
418 return length;
419
420 if (count >= PAGE_SIZE)
421 return -ENOMEM;
422 if (*ppos != 0) {
423 /* No partial writes. */
424 return -EINVAL;
425 }
426 page = (char *)get_zeroed_page(GFP_KERNEL);
427 if (!page)
428 return -ENOMEM;
429 length = -EFAULT;
430 if (copy_from_user(page, buf, count))
431 goto out;
432
433 length = -EINVAL;
434 if (sscanf(page, "%u", &new_value) != 1)
435 goto out;
436
437 selinux_checkreqprot = new_value ? 1 : 0;
438 length = count;
439 out:
440 free_page((unsigned long) page);
441 return length;
442 }
443 static const struct file_operations sel_checkreqprot_ops = {
444 .read = sel_read_checkreqprot,
445 .write = sel_write_checkreqprot,
446 .llseek = generic_file_llseek,
447 };
448
449 /*
450 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
451 */
452 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
453 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
454 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
455 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
456 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
457
458 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
459 [SEL_ACCESS] = sel_write_access,
460 [SEL_CREATE] = sel_write_create,
461 [SEL_RELABEL] = sel_write_relabel,
462 [SEL_USER] = sel_write_user,
463 [SEL_MEMBER] = sel_write_member,
464 [SEL_CONTEXT] = sel_write_context,
465 };
466
467 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
468 {
469 ino_t ino = file->f_path.dentry->d_inode->i_ino;
470 char *data;
471 ssize_t rv;
472
473 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
474 return -EINVAL;
475
476 data = simple_transaction_get(file, buf, size);
477 if (IS_ERR(data))
478 return PTR_ERR(data);
479
480 rv = write_op[ino](file, data, size);
481 if (rv > 0) {
482 simple_transaction_set(file, rv);
483 rv = size;
484 }
485 return rv;
486 }
487
488 static const struct file_operations transaction_ops = {
489 .write = selinux_transaction_write,
490 .read = simple_transaction_read,
491 .release = simple_transaction_release,
492 .llseek = generic_file_llseek,
493 };
494
495 /*
496 * payload - write methods
497 * If the method has a response, the response should be put in buf,
498 * and the length returned. Otherwise return 0 or and -error.
499 */
500
501 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
502 {
503 char *scon, *tcon;
504 u32 ssid, tsid;
505 u16 tclass;
506 struct av_decision avd;
507 ssize_t length;
508
509 length = task_has_security(current, SECURITY__COMPUTE_AV);
510 if (length)
511 return length;
512
513 length = -ENOMEM;
514 scon = kzalloc(size + 1, GFP_KERNEL);
515 if (!scon)
516 return length;
517
518 tcon = kzalloc(size + 1, GFP_KERNEL);
519 if (!tcon)
520 goto out;
521
522 length = -EINVAL;
523 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
524 goto out2;
525
526 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
527 if (length < 0)
528 goto out2;
529 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
530 if (length < 0)
531 goto out2;
532
533 security_compute_av_user(ssid, tsid, tclass, &avd);
534
535 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
536 "%x %x %x %x %u %x",
537 avd.allowed, 0xffffffff,
538 avd.auditallow, avd.auditdeny,
539 avd.seqno, avd.flags);
540 out2:
541 kfree(tcon);
542 out:
543 kfree(scon);
544 return length;
545 }
546
547 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
548 {
549 char *scon, *tcon;
550 u32 ssid, tsid, newsid;
551 u16 tclass;
552 ssize_t length;
553 char *newcon;
554 u32 len;
555
556 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
557 if (length)
558 return length;
559
560 length = -ENOMEM;
561 scon = kzalloc(size + 1, GFP_KERNEL);
562 if (!scon)
563 return length;
564
565 tcon = kzalloc(size + 1, GFP_KERNEL);
566 if (!tcon)
567 goto out;
568
569 length = -EINVAL;
570 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
571 goto out2;
572
573 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
574 if (length < 0)
575 goto out2;
576 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
577 if (length < 0)
578 goto out2;
579
580 length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
581 if (length < 0)
582 goto out2;
583
584 length = security_sid_to_context(newsid, &newcon, &len);
585 if (length < 0)
586 goto out2;
587
588 if (len > SIMPLE_TRANSACTION_LIMIT) {
589 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
590 "payload max\n", __func__, len);
591 length = -ERANGE;
592 goto out3;
593 }
594
595 memcpy(buf, newcon, len);
596 length = len;
597 out3:
598 kfree(newcon);
599 out2:
600 kfree(tcon);
601 out:
602 kfree(scon);
603 return length;
604 }
605
606 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
607 {
608 char *scon, *tcon;
609 u32 ssid, tsid, newsid;
610 u16 tclass;
611 ssize_t length;
612 char *newcon;
613 u32 len;
614
615 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
616 if (length)
617 return length;
618
619 length = -ENOMEM;
620 scon = kzalloc(size + 1, GFP_KERNEL);
621 if (!scon)
622 return length;
623
624 tcon = kzalloc(size + 1, GFP_KERNEL);
625 if (!tcon)
626 goto out;
627
628 length = -EINVAL;
629 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
630 goto out2;
631
632 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
633 if (length < 0)
634 goto out2;
635 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
636 if (length < 0)
637 goto out2;
638
639 length = security_change_sid(ssid, tsid, tclass, &newsid);
640 if (length < 0)
641 goto out2;
642
643 length = security_sid_to_context(newsid, &newcon, &len);
644 if (length < 0)
645 goto out2;
646
647 if (len > SIMPLE_TRANSACTION_LIMIT) {
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_user(struct file *file, char *buf, size_t size)
664 {
665 char *con, *user, *ptr;
666 u32 sid, *sids;
667 ssize_t length;
668 char *newcon;
669 int i, rc;
670 u32 len, nsids;
671
672 length = task_has_security(current, SECURITY__COMPUTE_USER);
673 if (length)
674 return length;
675
676 length = -ENOMEM;
677 con = kzalloc(size + 1, GFP_KERNEL);
678 if (!con)
679 return length;
680
681 user = kzalloc(size + 1, GFP_KERNEL);
682 if (!user)
683 goto out;
684
685 length = -EINVAL;
686 if (sscanf(buf, "%s %s", con, user) != 2)
687 goto out2;
688
689 length = security_context_to_sid(con, strlen(con) + 1, &sid);
690 if (length < 0)
691 goto out2;
692
693 length = security_get_user_sids(sid, user, &sids, &nsids);
694 if (length < 0)
695 goto out2;
696
697 length = sprintf(buf, "%u", nsids) + 1;
698 ptr = buf + length;
699 for (i = 0; i < nsids; i++) {
700 rc = security_sid_to_context(sids[i], &newcon, &len);
701 if (rc) {
702 length = rc;
703 goto out3;
704 }
705 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
706 kfree(newcon);
707 length = -ERANGE;
708 goto out3;
709 }
710 memcpy(ptr, newcon, len);
711 kfree(newcon);
712 ptr += len;
713 length += len;
714 }
715 out3:
716 kfree(sids);
717 out2:
718 kfree(user);
719 out:
720 kfree(con);
721 return length;
722 }
723
724 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
725 {
726 char *scon, *tcon;
727 u32 ssid, tsid, newsid;
728 u16 tclass;
729 ssize_t length;
730 char *newcon;
731 u32 len;
732
733 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
734 if (length)
735 return length;
736
737 length = -ENOMEM;
738 scon = kzalloc(size + 1, GFP_KERNEL);
739 if (!scon)
740 return length;
741
742 tcon = kzalloc(size + 1, GFP_KERNEL);
743 if (!tcon)
744 goto out;
745
746 length = -EINVAL;
747 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
748 goto out2;
749
750 length = security_context_to_sid(scon, strlen(scon) + 1, &ssid);
751 if (length < 0)
752 goto out2;
753 length = security_context_to_sid(tcon, strlen(tcon) + 1, &tsid);
754 if (length < 0)
755 goto out2;
756
757 length = security_member_sid(ssid, tsid, tclass, &newsid);
758 if (length < 0)
759 goto out2;
760
761 length = security_sid_to_context(newsid, &newcon, &len);
762 if (length < 0)
763 goto out2;
764
765 if (len > SIMPLE_TRANSACTION_LIMIT) {
766 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
767 "payload max\n", __func__, len);
768 length = -ERANGE;
769 goto out3;
770 }
771
772 memcpy(buf, newcon, len);
773 length = len;
774 out3:
775 kfree(newcon);
776 out2:
777 kfree(tcon);
778 out:
779 kfree(scon);
780 return length;
781 }
782
783 static struct inode *sel_make_inode(struct super_block *sb, int mode)
784 {
785 struct inode *ret = new_inode(sb);
786
787 if (ret) {
788 ret->i_mode = mode;
789 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
790 }
791 return ret;
792 }
793
794 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
795 size_t count, loff_t *ppos)
796 {
797 char *page = NULL;
798 ssize_t length;
799 ssize_t ret;
800 int cur_enforcing;
801 struct inode *inode = filep->f_path.dentry->d_inode;
802 unsigned index = inode->i_ino & SEL_INO_MASK;
803 const char *name = filep->f_path.dentry->d_name.name;
804
805 mutex_lock(&sel_mutex);
806
807 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
808 ret = -EINVAL;
809 goto out;
810 }
811
812 page = (char *)get_zeroed_page(GFP_KERNEL);
813 if (!page) {
814 ret = -ENOMEM;
815 goto out;
816 }
817
818 cur_enforcing = security_get_bool_value(index);
819 if (cur_enforcing < 0) {
820 ret = cur_enforcing;
821 goto out;
822 }
823 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
824 bool_pending_values[index]);
825 ret = simple_read_from_buffer(buf, count, ppos, page, length);
826 out:
827 mutex_unlock(&sel_mutex);
828 if (page)
829 free_page((unsigned long)page);
830 return ret;
831 }
832
833 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
834 size_t count, loff_t *ppos)
835 {
836 char *page = NULL;
837 ssize_t length;
838 int new_value;
839 struct inode *inode = filep->f_path.dentry->d_inode;
840 unsigned index = inode->i_ino & SEL_INO_MASK;
841 const char *name = filep->f_path.dentry->d_name.name;
842
843 mutex_lock(&sel_mutex);
844
845 length = task_has_security(current, SECURITY__SETBOOL);
846 if (length)
847 goto out;
848
849 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
850 length = -EINVAL;
851 goto out;
852 }
853
854 if (count >= PAGE_SIZE) {
855 length = -ENOMEM;
856 goto out;
857 }
858
859 if (*ppos != 0) {
860 /* No partial writes. */
861 length = -EINVAL;
862 goto out;
863 }
864 page = (char *)get_zeroed_page(GFP_KERNEL);
865 if (!page) {
866 length = -ENOMEM;
867 goto out;
868 }
869
870 length = -EFAULT;
871 if (copy_from_user(page, buf, count))
872 goto out;
873
874 length = -EINVAL;
875 if (sscanf(page, "%d", &new_value) != 1)
876 goto out;
877
878 if (new_value)
879 new_value = 1;
880
881 bool_pending_values[index] = new_value;
882 length = count;
883
884 out:
885 mutex_unlock(&sel_mutex);
886 if (page)
887 free_page((unsigned long) page);
888 return length;
889 }
890
891 static const struct file_operations sel_bool_ops = {
892 .read = sel_read_bool,
893 .write = sel_write_bool,
894 .llseek = generic_file_llseek,
895 };
896
897 static ssize_t sel_commit_bools_write(struct file *filep,
898 const char __user *buf,
899 size_t count, loff_t *ppos)
900 {
901 char *page = NULL;
902 ssize_t length;
903 int new_value;
904
905 mutex_lock(&sel_mutex);
906
907 length = task_has_security(current, SECURITY__SETBOOL);
908 if (length)
909 goto out;
910
911 if (count >= PAGE_SIZE) {
912 length = -ENOMEM;
913 goto out;
914 }
915 if (*ppos != 0) {
916 /* No partial writes. */
917 goto out;
918 }
919 page = (char *)get_zeroed_page(GFP_KERNEL);
920 if (!page) {
921 length = -ENOMEM;
922 goto out;
923 }
924
925 length = -EFAULT;
926 if (copy_from_user(page, buf, count))
927 goto out;
928
929 length = -EINVAL;
930 if (sscanf(page, "%d", &new_value) != 1)
931 goto out;
932
933 if (new_value && bool_pending_values)
934 security_set_bools(bool_num, bool_pending_values);
935
936 length = count;
937
938 out:
939 mutex_unlock(&sel_mutex);
940 if (page)
941 free_page((unsigned long) page);
942 return length;
943 }
944
945 static const struct file_operations sel_commit_bools_ops = {
946 .write = sel_commit_bools_write,
947 .llseek = generic_file_llseek,
948 };
949
950 static void sel_remove_entries(struct dentry *de)
951 {
952 struct list_head *node;
953
954 spin_lock(&dcache_lock);
955 node = de->d_subdirs.next;
956 while (node != &de->d_subdirs) {
957 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
958 list_del_init(node);
959
960 if (d->d_inode) {
961 d = dget_locked(d);
962 spin_unlock(&dcache_lock);
963 d_delete(d);
964 simple_unlink(de->d_inode, d);
965 dput(d);
966 spin_lock(&dcache_lock);
967 }
968 node = de->d_subdirs.next;
969 }
970
971 spin_unlock(&dcache_lock);
972 }
973
974 #define BOOL_DIR_NAME "booleans"
975
976 static int sel_make_bools(void)
977 {
978 int i, ret = 0;
979 ssize_t len;
980 struct dentry *dentry = NULL;
981 struct dentry *dir = bool_dir;
982 struct inode *inode = NULL;
983 struct inode_security_struct *isec;
984 char **names = NULL, *page;
985 int num;
986 int *values = NULL;
987 u32 sid;
988
989 /* remove any existing files */
990 for (i = 0; i < bool_num; i++)
991 kfree(bool_pending_names[i]);
992 kfree(bool_pending_names);
993 kfree(bool_pending_values);
994 bool_pending_names = NULL;
995 bool_pending_values = NULL;
996
997 sel_remove_entries(dir);
998
999 page = (char *)get_zeroed_page(GFP_KERNEL);
1000 if (!page)
1001 return -ENOMEM;
1002
1003 ret = security_get_bools(&num, &names, &values);
1004 if (ret != 0)
1005 goto out;
1006
1007 for (i = 0; i < num; i++) {
1008 dentry = d_alloc_name(dir, names[i]);
1009 if (!dentry) {
1010 ret = -ENOMEM;
1011 goto err;
1012 }
1013 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1014 if (!inode) {
1015 ret = -ENOMEM;
1016 goto err;
1017 }
1018
1019 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1020 if (len < 0) {
1021 ret = -EINVAL;
1022 goto err;
1023 } else if (len >= PAGE_SIZE) {
1024 ret = -ENAMETOOLONG;
1025 goto err;
1026 }
1027 isec = (struct inode_security_struct *)inode->i_security;
1028 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1029 if (ret)
1030 goto err;
1031 isec->sid = sid;
1032 isec->initialized = 1;
1033 inode->i_fop = &sel_bool_ops;
1034 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1035 d_add(dentry, inode);
1036 }
1037 bool_num = num;
1038 bool_pending_names = names;
1039 bool_pending_values = values;
1040 out:
1041 free_page((unsigned long)page);
1042 return ret;
1043 err:
1044 if (names) {
1045 for (i = 0; i < num; i++)
1046 kfree(names[i]);
1047 kfree(names);
1048 }
1049 kfree(values);
1050 sel_remove_entries(dir);
1051 ret = -ENOMEM;
1052 goto out;
1053 }
1054
1055 #define NULL_FILE_NAME "null"
1056
1057 struct dentry *selinux_null;
1058
1059 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1060 size_t count, loff_t *ppos)
1061 {
1062 char tmpbuf[TMPBUFLEN];
1063 ssize_t length;
1064
1065 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1066 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1067 }
1068
1069 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1070 const char __user *buf,
1071 size_t count, loff_t *ppos)
1072
1073 {
1074 char *page;
1075 ssize_t ret;
1076 int new_value;
1077
1078 if (count >= PAGE_SIZE) {
1079 ret = -ENOMEM;
1080 goto out;
1081 }
1082
1083 if (*ppos != 0) {
1084 /* No partial writes. */
1085 ret = -EINVAL;
1086 goto out;
1087 }
1088
1089 page = (char *)get_zeroed_page(GFP_KERNEL);
1090 if (!page) {
1091 ret = -ENOMEM;
1092 goto out;
1093 }
1094
1095 if (copy_from_user(page, buf, count)) {
1096 ret = -EFAULT;
1097 goto out_free;
1098 }
1099
1100 if (sscanf(page, "%u", &new_value) != 1) {
1101 ret = -EINVAL;
1102 goto out;
1103 }
1104
1105 if (new_value != avc_cache_threshold) {
1106 ret = task_has_security(current, SECURITY__SETSECPARAM);
1107 if (ret)
1108 goto out_free;
1109 avc_cache_threshold = new_value;
1110 }
1111 ret = count;
1112 out_free:
1113 free_page((unsigned long)page);
1114 out:
1115 return ret;
1116 }
1117
1118 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1119 size_t count, loff_t *ppos)
1120 {
1121 char *page;
1122 ssize_t ret = 0;
1123
1124 page = (char *)__get_free_page(GFP_KERNEL);
1125 if (!page) {
1126 ret = -ENOMEM;
1127 goto out;
1128 }
1129 ret = avc_get_hash_stats(page);
1130 if (ret >= 0)
1131 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1132 free_page((unsigned long)page);
1133 out:
1134 return ret;
1135 }
1136
1137 static const struct file_operations sel_avc_cache_threshold_ops = {
1138 .read = sel_read_avc_cache_threshold,
1139 .write = sel_write_avc_cache_threshold,
1140 .llseek = generic_file_llseek,
1141 };
1142
1143 static const struct file_operations sel_avc_hash_stats_ops = {
1144 .read = sel_read_avc_hash_stats,
1145 .llseek = generic_file_llseek,
1146 };
1147
1148 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1149 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1150 {
1151 int cpu;
1152
1153 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1154 if (!cpu_possible(cpu))
1155 continue;
1156 *idx = cpu + 1;
1157 return &per_cpu(avc_cache_stats, cpu);
1158 }
1159 return NULL;
1160 }
1161
1162 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1163 {
1164 loff_t n = *pos - 1;
1165
1166 if (*pos == 0)
1167 return SEQ_START_TOKEN;
1168
1169 return sel_avc_get_stat_idx(&n);
1170 }
1171
1172 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1173 {
1174 return sel_avc_get_stat_idx(pos);
1175 }
1176
1177 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1178 {
1179 struct avc_cache_stats *st = v;
1180
1181 if (v == SEQ_START_TOKEN)
1182 seq_printf(seq, "lookups hits misses allocations reclaims "
1183 "frees\n");
1184 else
1185 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1186 st->hits, st->misses, st->allocations,
1187 st->reclaims, st->frees);
1188 return 0;
1189 }
1190
1191 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1192 { }
1193
1194 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1195 .start = sel_avc_stats_seq_start,
1196 .next = sel_avc_stats_seq_next,
1197 .show = sel_avc_stats_seq_show,
1198 .stop = sel_avc_stats_seq_stop,
1199 };
1200
1201 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1202 {
1203 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1204 }
1205
1206 static const struct file_operations sel_avc_cache_stats_ops = {
1207 .open = sel_open_avc_cache_stats,
1208 .read = seq_read,
1209 .llseek = seq_lseek,
1210 .release = seq_release,
1211 };
1212 #endif
1213
1214 static int sel_make_avc_files(struct dentry *dir)
1215 {
1216 int i, ret = 0;
1217 static struct tree_descr files[] = {
1218 { "cache_threshold",
1219 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1220 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1221 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1222 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1223 #endif
1224 };
1225
1226 for (i = 0; i < ARRAY_SIZE(files); i++) {
1227 struct inode *inode;
1228 struct dentry *dentry;
1229
1230 dentry = d_alloc_name(dir, files[i].name);
1231 if (!dentry) {
1232 ret = -ENOMEM;
1233 goto out;
1234 }
1235
1236 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1237 if (!inode) {
1238 ret = -ENOMEM;
1239 goto out;
1240 }
1241 inode->i_fop = files[i].ops;
1242 inode->i_ino = ++sel_last_ino;
1243 d_add(dentry, inode);
1244 }
1245 out:
1246 return ret;
1247 }
1248
1249 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1250 size_t count, loff_t *ppos)
1251 {
1252 struct inode *inode;
1253 char *con;
1254 u32 sid, len;
1255 ssize_t ret;
1256
1257 inode = file->f_path.dentry->d_inode;
1258 sid = inode->i_ino&SEL_INO_MASK;
1259 ret = security_sid_to_context(sid, &con, &len);
1260 if (ret < 0)
1261 return ret;
1262
1263 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1264 kfree(con);
1265 return ret;
1266 }
1267
1268 static const struct file_operations sel_initcon_ops = {
1269 .read = sel_read_initcon,
1270 .llseek = generic_file_llseek,
1271 };
1272
1273 static int sel_make_initcon_files(struct dentry *dir)
1274 {
1275 int i, ret = 0;
1276
1277 for (i = 1; i <= SECINITSID_NUM; i++) {
1278 struct inode *inode;
1279 struct dentry *dentry;
1280 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1281 if (!dentry) {
1282 ret = -ENOMEM;
1283 goto out;
1284 }
1285
1286 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1287 if (!inode) {
1288 ret = -ENOMEM;
1289 goto out;
1290 }
1291 inode->i_fop = &sel_initcon_ops;
1292 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1293 d_add(dentry, inode);
1294 }
1295 out:
1296 return ret;
1297 }
1298
1299 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1300 {
1301 return a / b - (a % b < 0);
1302 }
1303
1304 static inline unsigned long sel_class_to_ino(u16 class)
1305 {
1306 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1307 }
1308
1309 static inline u16 sel_ino_to_class(unsigned long ino)
1310 {
1311 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1312 }
1313
1314 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1315 {
1316 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1317 }
1318
1319 static inline u32 sel_ino_to_perm(unsigned long ino)
1320 {
1321 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1322 }
1323
1324 static ssize_t sel_read_class(struct file *file, char __user *buf,
1325 size_t count, loff_t *ppos)
1326 {
1327 ssize_t rc, len;
1328 char *page;
1329 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1330
1331 page = (char *)__get_free_page(GFP_KERNEL);
1332 if (!page) {
1333 rc = -ENOMEM;
1334 goto out;
1335 }
1336
1337 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1338 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1339 free_page((unsigned long)page);
1340 out:
1341 return rc;
1342 }
1343
1344 static const struct file_operations sel_class_ops = {
1345 .read = sel_read_class,
1346 .llseek = generic_file_llseek,
1347 };
1348
1349 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1350 size_t count, loff_t *ppos)
1351 {
1352 ssize_t rc, len;
1353 char *page;
1354 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1355
1356 page = (char *)__get_free_page(GFP_KERNEL);
1357 if (!page) {
1358 rc = -ENOMEM;
1359 goto out;
1360 }
1361
1362 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1363 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1364 free_page((unsigned long)page);
1365 out:
1366 return rc;
1367 }
1368
1369 static const struct file_operations sel_perm_ops = {
1370 .read = sel_read_perm,
1371 .llseek = generic_file_llseek,
1372 };
1373
1374 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1375 size_t count, loff_t *ppos)
1376 {
1377 int value;
1378 char tmpbuf[TMPBUFLEN];
1379 ssize_t length;
1380 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1381
1382 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1383 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1384
1385 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1386 }
1387
1388 static const struct file_operations sel_policycap_ops = {
1389 .read = sel_read_policycap,
1390 .llseek = generic_file_llseek,
1391 };
1392
1393 static int sel_make_perm_files(char *objclass, int classvalue,
1394 struct dentry *dir)
1395 {
1396 int i, rc = 0, nperms;
1397 char **perms;
1398
1399 rc = security_get_permissions(objclass, &perms, &nperms);
1400 if (rc)
1401 goto out;
1402
1403 for (i = 0; i < nperms; i++) {
1404 struct inode *inode;
1405 struct dentry *dentry;
1406
1407 dentry = d_alloc_name(dir, perms[i]);
1408 if (!dentry) {
1409 rc = -ENOMEM;
1410 goto out1;
1411 }
1412
1413 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1414 if (!inode) {
1415 rc = -ENOMEM;
1416 goto out1;
1417 }
1418 inode->i_fop = &sel_perm_ops;
1419 /* i+1 since perm values are 1-indexed */
1420 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1421 d_add(dentry, inode);
1422 }
1423
1424 out1:
1425 for (i = 0; i < nperms; i++)
1426 kfree(perms[i]);
1427 kfree(perms);
1428 out:
1429 return rc;
1430 }
1431
1432 static int sel_make_class_dir_entries(char *classname, int index,
1433 struct dentry *dir)
1434 {
1435 struct dentry *dentry = NULL;
1436 struct inode *inode = NULL;
1437 int rc;
1438
1439 dentry = d_alloc_name(dir, "index");
1440 if (!dentry) {
1441 rc = -ENOMEM;
1442 goto out;
1443 }
1444
1445 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1446 if (!inode) {
1447 rc = -ENOMEM;
1448 goto out;
1449 }
1450
1451 inode->i_fop = &sel_class_ops;
1452 inode->i_ino = sel_class_to_ino(index);
1453 d_add(dentry, inode);
1454
1455 dentry = d_alloc_name(dir, "perms");
1456 if (!dentry) {
1457 rc = -ENOMEM;
1458 goto out;
1459 }
1460
1461 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1462 if (rc)
1463 goto out;
1464
1465 rc = sel_make_perm_files(classname, index, dentry);
1466
1467 out:
1468 return rc;
1469 }
1470
1471 static void sel_remove_classes(void)
1472 {
1473 struct list_head *class_node;
1474
1475 list_for_each(class_node, &class_dir->d_subdirs) {
1476 struct dentry *class_subdir = list_entry(class_node,
1477 struct dentry, d_u.d_child);
1478 struct list_head *class_subdir_node;
1479
1480 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1481 struct dentry *d = list_entry(class_subdir_node,
1482 struct dentry, d_u.d_child);
1483
1484 if (d->d_inode)
1485 if (d->d_inode->i_mode & S_IFDIR)
1486 sel_remove_entries(d);
1487 }
1488
1489 sel_remove_entries(class_subdir);
1490 }
1491
1492 sel_remove_entries(class_dir);
1493 }
1494
1495 static int sel_make_classes(void)
1496 {
1497 int rc = 0, nclasses, i;
1498 char **classes;
1499
1500 /* delete any existing entries */
1501 sel_remove_classes();
1502
1503 rc = security_get_classes(&classes, &nclasses);
1504 if (rc < 0)
1505 goto out;
1506
1507 /* +2 since classes are 1-indexed */
1508 last_class_ino = sel_class_to_ino(nclasses + 2);
1509
1510 for (i = 0; i < nclasses; i++) {
1511 struct dentry *class_name_dir;
1512
1513 class_name_dir = d_alloc_name(class_dir, classes[i]);
1514 if (!class_name_dir) {
1515 rc = -ENOMEM;
1516 goto out1;
1517 }
1518
1519 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1520 &last_class_ino);
1521 if (rc)
1522 goto out1;
1523
1524 /* i+1 since class values are 1-indexed */
1525 rc = sel_make_class_dir_entries(classes[i], i + 1,
1526 class_name_dir);
1527 if (rc)
1528 goto out1;
1529 }
1530
1531 out1:
1532 for (i = 0; i < nclasses; i++)
1533 kfree(classes[i]);
1534 kfree(classes);
1535 out:
1536 return rc;
1537 }
1538
1539 static int sel_make_policycap(void)
1540 {
1541 unsigned int iter;
1542 struct dentry *dentry = NULL;
1543 struct inode *inode = NULL;
1544
1545 sel_remove_entries(policycap_dir);
1546
1547 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1548 if (iter < ARRAY_SIZE(policycap_names))
1549 dentry = d_alloc_name(policycap_dir,
1550 policycap_names[iter]);
1551 else
1552 dentry = d_alloc_name(policycap_dir, "unknown");
1553
1554 if (dentry == NULL)
1555 return -ENOMEM;
1556
1557 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1558 if (inode == NULL)
1559 return -ENOMEM;
1560
1561 inode->i_fop = &sel_policycap_ops;
1562 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1563 d_add(dentry, inode);
1564 }
1565
1566 return 0;
1567 }
1568
1569 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1570 unsigned long *ino)
1571 {
1572 int ret = 0;
1573 struct inode *inode;
1574
1575 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1576 if (!inode) {
1577 ret = -ENOMEM;
1578 goto out;
1579 }
1580 inode->i_op = &simple_dir_inode_operations;
1581 inode->i_fop = &simple_dir_operations;
1582 inode->i_ino = ++(*ino);
1583 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1584 inc_nlink(inode);
1585 d_add(dentry, inode);
1586 /* bump link count on parent directory, too */
1587 inc_nlink(dir);
1588 out:
1589 return ret;
1590 }
1591
1592 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1593 {
1594 int ret;
1595 struct dentry *dentry;
1596 struct inode *inode, *root_inode;
1597 struct inode_security_struct *isec;
1598
1599 static struct tree_descr selinux_files[] = {
1600 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1601 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1602 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1603 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1604 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1605 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1606 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1607 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1608 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1609 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1610 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1611 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1612 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1613 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1614 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1615 /* last one */ {""}
1616 };
1617 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1618 if (ret)
1619 goto err;
1620
1621 root_inode = sb->s_root->d_inode;
1622
1623 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1624 if (!dentry) {
1625 ret = -ENOMEM;
1626 goto err;
1627 }
1628
1629 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1630 if (ret)
1631 goto err;
1632
1633 bool_dir = dentry;
1634
1635 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1636 if (!dentry) {
1637 ret = -ENOMEM;
1638 goto err;
1639 }
1640
1641 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1642 if (!inode) {
1643 ret = -ENOMEM;
1644 goto err;
1645 }
1646 inode->i_ino = ++sel_last_ino;
1647 isec = (struct inode_security_struct *)inode->i_security;
1648 isec->sid = SECINITSID_DEVNULL;
1649 isec->sclass = SECCLASS_CHR_FILE;
1650 isec->initialized = 1;
1651
1652 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1653 d_add(dentry, inode);
1654 selinux_null = dentry;
1655
1656 dentry = d_alloc_name(sb->s_root, "avc");
1657 if (!dentry) {
1658 ret = -ENOMEM;
1659 goto err;
1660 }
1661
1662 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1663 if (ret)
1664 goto err;
1665
1666 ret = sel_make_avc_files(dentry);
1667 if (ret)
1668 goto err;
1669
1670 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1671 if (!dentry) {
1672 ret = -ENOMEM;
1673 goto err;
1674 }
1675
1676 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1677 if (ret)
1678 goto err;
1679
1680 ret = sel_make_initcon_files(dentry);
1681 if (ret)
1682 goto err;
1683
1684 dentry = d_alloc_name(sb->s_root, "class");
1685 if (!dentry) {
1686 ret = -ENOMEM;
1687 goto err;
1688 }
1689
1690 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1691 if (ret)
1692 goto err;
1693
1694 class_dir = dentry;
1695
1696 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1697 if (!dentry) {
1698 ret = -ENOMEM;
1699 goto err;
1700 }
1701
1702 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1703 if (ret)
1704 goto err;
1705
1706 policycap_dir = dentry;
1707
1708 out:
1709 return ret;
1710 err:
1711 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1712 __func__);
1713 goto out;
1714 }
1715
1716 static int sel_get_sb(struct file_system_type *fs_type,
1717 int flags, const char *dev_name, void *data,
1718 struct vfsmount *mnt)
1719 {
1720 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1721 }
1722
1723 static struct file_system_type sel_fs_type = {
1724 .name = "selinuxfs",
1725 .get_sb = sel_get_sb,
1726 .kill_sb = kill_litter_super,
1727 };
1728
1729 struct vfsmount *selinuxfs_mount;
1730
1731 static int __init init_sel_fs(void)
1732 {
1733 int err;
1734
1735 if (!selinux_enabled)
1736 return 0;
1737 err = register_filesystem(&sel_fs_type);
1738 if (!err) {
1739 selinuxfs_mount = kern_mount(&sel_fs_type);
1740 if (IS_ERR(selinuxfs_mount)) {
1741 printk(KERN_ERR "selinuxfs: could not mount!\n");
1742 err = PTR_ERR(selinuxfs_mount);
1743 selinuxfs_mount = NULL;
1744 }
1745 }
1746 return err;
1747 }
1748
1749 __initcall(init_sel_fs);
1750
1751 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1752 void exit_sel_fs(void)
1753 {
1754 unregister_filesystem(&sel_fs_type);
1755 }
1756 #endif
kernel source for telekom puls (alcatel/mediatek)