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PM: Convert wakeup flag accessors to inline functions
[linux-2.6/mini2440.git] / security / selinux / selinuxfs.c
blob26fabad097693ce5ea6e7ab8351e19840ad675bf
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 #include <asm/semaphore.h>
32
33 /* selinuxfs pseudo filesystem for exporting the security policy API.
34 Based on the proc code and the fs/nfsd/nfsctl.c code. */
35
36 #include "flask.h"
37 #include "avc.h"
38 #include "avc_ss.h"
39 #include "security.h"
40 #include "objsec.h"
41 #include "conditional.h"
42
43 /* Policy capability filenames */
44 static char *policycap_names[] = {
45 "network_peer_controls",
46 "open_perms"
47 };
48
49 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
50
51 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
52 #define SELINUX_COMPAT_NET_VALUE 0
53 #else
54 #define SELINUX_COMPAT_NET_VALUE 1
55 #endif
56
57 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
58
59 static int __init checkreqprot_setup(char *str)
60 {
61 selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
62 return 1;
63 }
64 __setup("checkreqprot=", checkreqprot_setup);
65
66 static int __init selinux_compat_net_setup(char *str)
67 {
68 selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
69 return 1;
70 }
71 __setup("selinux_compat_net=", selinux_compat_net_setup);
72
73
74 static DEFINE_MUTEX(sel_mutex);
75
76 /* global data for booleans */
77 static struct dentry *bool_dir = NULL;
78 static int bool_num = 0;
79 static char **bool_pending_names;
80 static int *bool_pending_values = NULL;
81
82 /* global data for classes */
83 static struct dentry *class_dir = NULL;
84 static unsigned long last_class_ino;
85
86 /* global data for policy capabilities */
87 static struct dentry *policycap_dir = NULL;
88
89 extern void selnl_notify_setenforce(int val);
90
91 /* Check whether a task is allowed to use a security operation. */
92 static int task_has_security(struct task_struct *tsk,
93 u32 perms)
94 {
95 struct task_security_struct *tsec;
96
97 tsec = tsk->security;
98 if (!tsec)
99 return -EACCES;
100
101 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
102 SECCLASS_SECURITY, perms, NULL);
103 }
104
105 enum sel_inos {
106 SEL_ROOT_INO = 2,
107 SEL_LOAD, /* load policy */
108 SEL_ENFORCE, /* get or set enforcing status */
109 SEL_CONTEXT, /* validate context */
110 SEL_ACCESS, /* compute access decision */
111 SEL_CREATE, /* compute create labeling decision */
112 SEL_RELABEL, /* compute relabeling decision */
113 SEL_USER, /* compute reachable user contexts */
114 SEL_POLICYVERS, /* return policy version for this kernel */
115 SEL_COMMIT_BOOLS, /* commit new boolean values */
116 SEL_MLS, /* return if MLS policy is enabled */
117 SEL_DISABLE, /* disable SELinux until next reboot */
118 SEL_MEMBER, /* compute polyinstantiation membership decision */
119 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
120 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
121 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
122 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
123 SEL_INO_NEXT, /* The next inode number to use */
124 };
125
126 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
127
128 #define SEL_INITCON_INO_OFFSET 0x01000000
129 #define SEL_BOOL_INO_OFFSET 0x02000000
130 #define SEL_CLASS_INO_OFFSET 0x04000000
131 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
132 #define SEL_INO_MASK 0x00ffffff
133
134 #define TMPBUFLEN 12
135 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
136 size_t count, loff_t *ppos)
137 {
138 char tmpbuf[TMPBUFLEN];
139 ssize_t length;
140
141 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
142 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
143 }
144
145 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
146 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
147 size_t count, loff_t *ppos)
148
149 {
150 char *page;
151 ssize_t length;
152 int new_value;
153
154 if (count >= PAGE_SIZE)
155 return -ENOMEM;
156 if (*ppos != 0) {
157 /* No partial writes. */
158 return -EINVAL;
159 }
160 page = (char*)get_zeroed_page(GFP_KERNEL);
161 if (!page)
162 return -ENOMEM;
163 length = -EFAULT;
164 if (copy_from_user(page, buf, count))
165 goto out;
166
167 length = -EINVAL;
168 if (sscanf(page, "%d", &new_value) != 1)
169 goto out;
170
171 if (new_value != selinux_enforcing) {
172 length = task_has_security(current, SECURITY__SETENFORCE);
173 if (length)
174 goto out;
175 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
176 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
177 new_value, selinux_enforcing,
178 audit_get_loginuid(current),
179 audit_get_sessionid(current));
180 selinux_enforcing = new_value;
181 if (selinux_enforcing)
182 avc_ss_reset(0);
183 selnl_notify_setenforce(selinux_enforcing);
184 }
185 length = count;
186 out:
187 free_page((unsigned long) page);
188 return length;
189 }
190 #else
191 #define sel_write_enforce NULL
192 #endif
193
194 static const struct file_operations sel_enforce_ops = {
195 .read = sel_read_enforce,
196 .write = sel_write_enforce,
197 };
198
199 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
200 size_t count, loff_t *ppos)
201 {
202 char tmpbuf[TMPBUFLEN];
203 ssize_t length;
204 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
205 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
206 security_get_reject_unknown() : !security_get_allow_unknown();
207
208 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
209 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
210 }
211
212 static const struct file_operations sel_handle_unknown_ops = {
213 .read = sel_read_handle_unknown,
214 };
215
216 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
217 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
218 size_t count, loff_t *ppos)
219
220 {
221 char *page;
222 ssize_t length;
223 int new_value;
224 extern int selinux_disable(void);
225
226 if (count >= PAGE_SIZE)
227 return -ENOMEM;
228 if (*ppos != 0) {
229 /* No partial writes. */
230 return -EINVAL;
231 }
232 page = (char*)get_zeroed_page(GFP_KERNEL);
233 if (!page)
234 return -ENOMEM;
235 length = -EFAULT;
236 if (copy_from_user(page, buf, count))
237 goto out;
238
239 length = -EINVAL;
240 if (sscanf(page, "%d", &new_value) != 1)
241 goto out;
242
243 if (new_value) {
244 length = selinux_disable();
245 if (length < 0)
246 goto out;
247 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
248 "selinux=0 auid=%u ses=%u",
249 audit_get_loginuid(current),
250 audit_get_sessionid(current));
251 }
252
253 length = count;
254 out:
255 free_page((unsigned long) page);
256 return length;
257 }
258 #else
259 #define sel_write_disable NULL
260 #endif
261
262 static const struct file_operations sel_disable_ops = {
263 .write = sel_write_disable,
264 };
265
266 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
267 size_t count, loff_t *ppos)
268 {
269 char tmpbuf[TMPBUFLEN];
270 ssize_t length;
271
272 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
273 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
274 }
275
276 static const struct file_operations sel_policyvers_ops = {
277 .read = sel_read_policyvers,
278 };
279
280 /* declaration for sel_write_load */
281 static int sel_make_bools(void);
282 static int sel_make_classes(void);
283 static int sel_make_policycap(void);
284
285 /* declaration for sel_make_class_dirs */
286 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
287 unsigned long *ino);
288
289 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
290 size_t count, loff_t *ppos)
291 {
292 char tmpbuf[TMPBUFLEN];
293 ssize_t length;
294
295 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
296 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
297 }
298
299 static const struct file_operations sel_mls_ops = {
300 .read = sel_read_mls,
301 };
302
303 static ssize_t sel_write_load(struct file * file, const char __user * buf,
304 size_t count, loff_t *ppos)
305
306 {
307 int ret;
308 ssize_t length;
309 void *data = NULL;
310
311 mutex_lock(&sel_mutex);
312
313 length = task_has_security(current, SECURITY__LOAD_POLICY);
314 if (length)
315 goto out;
316
317 if (*ppos != 0) {
318 /* No partial writes. */
319 length = -EINVAL;
320 goto out;
321 }
322
323 if ((count > 64 * 1024 * 1024)
324 || (data = vmalloc(count)) == NULL) {
325 length = -ENOMEM;
326 goto out;
327 }
328
329 length = -EFAULT;
330 if (copy_from_user(data, buf, count) != 0)
331 goto out;
332
333 length = security_load_policy(data, count);
334 if (length)
335 goto out;
336
337 ret = sel_make_bools();
338 if (ret) {
339 length = ret;
340 goto out1;
341 }
342
343 ret = sel_make_classes();
344 if (ret) {
345 length = ret;
346 goto out1;
347 }
348
349 ret = sel_make_policycap();
350 if (ret)
351 length = ret;
352 else
353 length = count;
354
355 out1:
356
357 printk(KERN_INFO "SELinux: policy loaded with handle_unknown=%s\n",
358 (security_get_reject_unknown() ? "reject" :
359 (security_get_allow_unknown() ? "allow" : "deny")));
360
361 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
362 "policy loaded auid=%u ses=%u",
363 audit_get_loginuid(current),
364 audit_get_sessionid(current));
365 out:
366 mutex_unlock(&sel_mutex);
367 vfree(data);
368 return length;
369 }
370
371 static const struct file_operations sel_load_ops = {
372 .write = sel_write_load,
373 };
374
375 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
376 {
377 char *canon;
378 u32 sid, len;
379 ssize_t length;
380
381 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
382 if (length)
383 return length;
384
385 length = security_context_to_sid(buf, size, &sid);
386 if (length < 0)
387 return length;
388
389 length = security_sid_to_context(sid, &canon, &len);
390 if (length < 0)
391 return length;
392
393 if (len > SIMPLE_TRANSACTION_LIMIT) {
394 printk(KERN_ERR "%s: context size (%u) exceeds payload "
395 "max\n", __func__, len);
396 length = -ERANGE;
397 goto out;
398 }
399
400 memcpy(buf, canon, len);
401 length = len;
402 out:
403 kfree(canon);
404 return length;
405 }
406
407 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
408 size_t count, loff_t *ppos)
409 {
410 char tmpbuf[TMPBUFLEN];
411 ssize_t length;
412
413 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
414 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
415 }
416
417 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
418 size_t count, loff_t *ppos)
419 {
420 char *page;
421 ssize_t length;
422 unsigned int new_value;
423
424 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
425 if (length)
426 return length;
427
428 if (count >= PAGE_SIZE)
429 return -ENOMEM;
430 if (*ppos != 0) {
431 /* No partial writes. */
432 return -EINVAL;
433 }
434 page = (char*)get_zeroed_page(GFP_KERNEL);
435 if (!page)
436 return -ENOMEM;
437 length = -EFAULT;
438 if (copy_from_user(page, buf, count))
439 goto out;
440
441 length = -EINVAL;
442 if (sscanf(page, "%u", &new_value) != 1)
443 goto out;
444
445 selinux_checkreqprot = new_value ? 1 : 0;
446 length = count;
447 out:
448 free_page((unsigned long) page);
449 return length;
450 }
451 static const struct file_operations sel_checkreqprot_ops = {
452 .read = sel_read_checkreqprot,
453 .write = sel_write_checkreqprot,
454 };
455
456 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
457 size_t count, loff_t *ppos)
458 {
459 char tmpbuf[TMPBUFLEN];
460 ssize_t length;
461
462 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
463 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
464 }
465
466 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
467 size_t count, loff_t *ppos)
468 {
469 char *page;
470 ssize_t length;
471 int new_value;
472
473 length = task_has_security(current, SECURITY__LOAD_POLICY);
474 if (length)
475 return length;
476
477 if (count >= PAGE_SIZE)
478 return -ENOMEM;
479 if (*ppos != 0) {
480 /* No partial writes. */
481 return -EINVAL;
482 }
483 page = (char*)get_zeroed_page(GFP_KERNEL);
484 if (!page)
485 return -ENOMEM;
486 length = -EFAULT;
487 if (copy_from_user(page, buf, count))
488 goto out;
489
490 length = -EINVAL;
491 if (sscanf(page, "%d", &new_value) != 1)
492 goto out;
493
494 selinux_compat_net = new_value ? 1 : 0;
495 length = count;
496 out:
497 free_page((unsigned long) page);
498 return length;
499 }
500 static const struct file_operations sel_compat_net_ops = {
501 .read = sel_read_compat_net,
502 .write = sel_write_compat_net,
503 };
504
505 /*
506 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
507 */
508 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
509 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
510 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
511 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
512 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
513
514 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
515 [SEL_ACCESS] = sel_write_access,
516 [SEL_CREATE] = sel_write_create,
517 [SEL_RELABEL] = sel_write_relabel,
518 [SEL_USER] = sel_write_user,
519 [SEL_MEMBER] = sel_write_member,
520 [SEL_CONTEXT] = sel_write_context,
521 };
522
523 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
524 {
525 ino_t ino = file->f_path.dentry->d_inode->i_ino;
526 char *data;
527 ssize_t rv;
528
529 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
530 return -EINVAL;
531
532 data = simple_transaction_get(file, buf, size);
533 if (IS_ERR(data))
534 return PTR_ERR(data);
535
536 rv = write_op[ino](file, data, size);
537 if (rv>0) {
538 simple_transaction_set(file, rv);
539 rv = size;
540 }
541 return rv;
542 }
543
544 static const struct file_operations transaction_ops = {
545 .write = selinux_transaction_write,
546 .read = simple_transaction_read,
547 .release = simple_transaction_release,
548 };
549
550 /*
551 * payload - write methods
552 * If the method has a response, the response should be put in buf,
553 * and the length returned. Otherwise return 0 or and -error.
554 */
555
556 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
557 {
558 char *scon, *tcon;
559 u32 ssid, tsid;
560 u16 tclass;
561 u32 req;
562 struct av_decision avd;
563 ssize_t length;
564
565 length = task_has_security(current, SECURITY__COMPUTE_AV);
566 if (length)
567 return length;
568
569 length = -ENOMEM;
570 scon = kzalloc(size+1, GFP_KERNEL);
571 if (!scon)
572 return length;
573
574 tcon = kzalloc(size+1, GFP_KERNEL);
575 if (!tcon)
576 goto out;
577
578 length = -EINVAL;
579 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
580 goto out2;
581
582 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
583 if (length < 0)
584 goto out2;
585 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
586 if (length < 0)
587 goto out2;
588
589 length = security_compute_av(ssid, tsid, tclass, req, &avd);
590 if (length < 0)
591 goto out2;
592
593 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
594 "%x %x %x %x %u",
595 avd.allowed, avd.decided,
596 avd.auditallow, avd.auditdeny,
597 avd.seqno);
598 out2:
599 kfree(tcon);
600 out:
601 kfree(scon);
602 return length;
603 }
604
605 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
606 {
607 char *scon, *tcon;
608 u32 ssid, tsid, newsid;
609 u16 tclass;
610 ssize_t length;
611 char *newcon;
612 u32 len;
613
614 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
615 if (length)
616 return length;
617
618 length = -ENOMEM;
619 scon = kzalloc(size+1, GFP_KERNEL);
620 if (!scon)
621 return length;
622
623 tcon = kzalloc(size+1, GFP_KERNEL);
624 if (!tcon)
625 goto out;
626
627 length = -EINVAL;
628 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
629 goto out2;
630
631 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
632 if (length < 0)
633 goto out2;
634 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
635 if (length < 0)
636 goto out2;
637
638 length = security_transition_sid(ssid, tsid, tclass, &newsid);
639 if (length < 0)
640 goto out2;
641
642 length = security_sid_to_context(newsid, &newcon, &len);
643 if (length < 0)
644 goto out2;
645
646 if (len > SIMPLE_TRANSACTION_LIMIT) {
647 printk(KERN_ERR "%s: context size (%u) exceeds payload "
648 "max\n", __func__, len);
649 length = -ERANGE;
650 goto out3;
651 }
652
653 memcpy(buf, newcon, len);
654 length = len;
655 out3:
656 kfree(newcon);
657 out2:
658 kfree(tcon);
659 out:
660 kfree(scon);
661 return length;
662 }
663
664 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
665 {
666 char *scon, *tcon;
667 u32 ssid, tsid, newsid;
668 u16 tclass;
669 ssize_t length;
670 char *newcon;
671 u32 len;
672
673 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
674 if (length)
675 return length;
676
677 length = -ENOMEM;
678 scon = kzalloc(size+1, GFP_KERNEL);
679 if (!scon)
680 return length;
681
682 tcon = kzalloc(size+1, GFP_KERNEL);
683 if (!tcon)
684 goto out;
685
686 length = -EINVAL;
687 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
688 goto out2;
689
690 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
691 if (length < 0)
692 goto out2;
693 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
694 if (length < 0)
695 goto out2;
696
697 length = security_change_sid(ssid, tsid, tclass, &newsid);
698 if (length < 0)
699 goto out2;
700
701 length = security_sid_to_context(newsid, &newcon, &len);
702 if (length < 0)
703 goto out2;
704
705 if (len > SIMPLE_TRANSACTION_LIMIT) {
706 length = -ERANGE;
707 goto out3;
708 }
709
710 memcpy(buf, newcon, len);
711 length = len;
712 out3:
713 kfree(newcon);
714 out2:
715 kfree(tcon);
716 out:
717 kfree(scon);
718 return length;
719 }
720
721 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
722 {
723 char *con, *user, *ptr;
724 u32 sid, *sids;
725 ssize_t length;
726 char *newcon;
727 int i, rc;
728 u32 len, nsids;
729
730 length = task_has_security(current, SECURITY__COMPUTE_USER);
731 if (length)
732 return length;
733
734 length = -ENOMEM;
735 con = kzalloc(size+1, GFP_KERNEL);
736 if (!con)
737 return length;
738
739 user = kzalloc(size+1, GFP_KERNEL);
740 if (!user)
741 goto out;
742
743 length = -EINVAL;
744 if (sscanf(buf, "%s %s", con, user) != 2)
745 goto out2;
746
747 length = security_context_to_sid(con, strlen(con)+1, &sid);
748 if (length < 0)
749 goto out2;
750
751 length = security_get_user_sids(sid, user, &sids, &nsids);
752 if (length < 0)
753 goto out2;
754
755 length = sprintf(buf, "%u", nsids) + 1;
756 ptr = buf + length;
757 for (i = 0; i < nsids; i++) {
758 rc = security_sid_to_context(sids[i], &newcon, &len);
759 if (rc) {
760 length = rc;
761 goto out3;
762 }
763 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
764 kfree(newcon);
765 length = -ERANGE;
766 goto out3;
767 }
768 memcpy(ptr, newcon, len);
769 kfree(newcon);
770 ptr += len;
771 length += len;
772 }
773 out3:
774 kfree(sids);
775 out2:
776 kfree(user);
777 out:
778 kfree(con);
779 return length;
780 }
781
782 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
783 {
784 char *scon, *tcon;
785 u32 ssid, tsid, newsid;
786 u16 tclass;
787 ssize_t length;
788 char *newcon;
789 u32 len;
790
791 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
792 if (length)
793 return length;
794
795 length = -ENOMEM;
796 scon = kzalloc(size+1, GFP_KERNEL);
797 if (!scon)
798 return length;
799
800 tcon = kzalloc(size+1, GFP_KERNEL);
801 if (!tcon)
802 goto out;
803
804 length = -EINVAL;
805 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
806 goto out2;
807
808 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
809 if (length < 0)
810 goto out2;
811 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
812 if (length < 0)
813 goto out2;
814
815 length = security_member_sid(ssid, tsid, tclass, &newsid);
816 if (length < 0)
817 goto out2;
818
819 length = security_sid_to_context(newsid, &newcon, &len);
820 if (length < 0)
821 goto out2;
822
823 if (len > SIMPLE_TRANSACTION_LIMIT) {
824 printk(KERN_ERR "%s: context size (%u) exceeds payload "
825 "max\n", __func__, len);
826 length = -ERANGE;
827 goto out3;
828 }
829
830 memcpy(buf, newcon, len);
831 length = len;
832 out3:
833 kfree(newcon);
834 out2:
835 kfree(tcon);
836 out:
837 kfree(scon);
838 return length;
839 }
840
841 static struct inode *sel_make_inode(struct super_block *sb, int mode)
842 {
843 struct inode *ret = new_inode(sb);
844
845 if (ret) {
846 ret->i_mode = mode;
847 ret->i_uid = ret->i_gid = 0;
848 ret->i_blocks = 0;
849 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
850 }
851 return ret;
852 }
853
854 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
855 size_t count, loff_t *ppos)
856 {
857 char *page = NULL;
858 ssize_t length;
859 ssize_t ret;
860 int cur_enforcing;
861 struct inode *inode = filep->f_path.dentry->d_inode;
862 unsigned index = inode->i_ino & SEL_INO_MASK;
863 const char *name = filep->f_path.dentry->d_name.name;
864
865 mutex_lock(&sel_mutex);
866
867 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
868 ret = -EINVAL;
869 goto out;
870 }
871
872 if (count > PAGE_SIZE) {
873 ret = -EINVAL;
874 goto out;
875 }
876 if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
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
999 length = count;
1000
1001 out:
1002 mutex_unlock(&sel_mutex);
1003 if (page)
1004 free_page((unsigned long) page);
1005 return length;
1006 }
1007
1008 static const struct file_operations sel_commit_bools_ops = {
1009 .write = sel_commit_bools_write,
1010 };
1011
1012 static void sel_remove_entries(struct dentry *de)
1013 {
1014 struct list_head *node;
1015
1016 spin_lock(&dcache_lock);
1017 node = de->d_subdirs.next;
1018 while (node != &de->d_subdirs) {
1019 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1020 list_del_init(node);
1021
1022 if (d->d_inode) {
1023 d = dget_locked(d);
1024 spin_unlock(&dcache_lock);
1025 d_delete(d);
1026 simple_unlink(de->d_inode, d);
1027 dput(d);
1028 spin_lock(&dcache_lock);
1029 }
1030 node = de->d_subdirs.next;
1031 }
1032
1033 spin_unlock(&dcache_lock);
1034 }
1035
1036 #define BOOL_DIR_NAME "booleans"
1037
1038 static int sel_make_bools(void)
1039 {
1040 int i, ret = 0;
1041 ssize_t len;
1042 struct dentry *dentry = NULL;
1043 struct dentry *dir = bool_dir;
1044 struct inode *inode = NULL;
1045 struct inode_security_struct *isec;
1046 char **names = NULL, *page;
1047 int num;
1048 int *values = NULL;
1049 u32 sid;
1050
1051 /* remove any existing files */
1052 kfree(bool_pending_names);
1053 kfree(bool_pending_values);
1054 bool_pending_names = NULL;
1055 bool_pending_values = NULL;
1056
1057 sel_remove_entries(dir);
1058
1059 if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
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 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1088 goto err;
1089 isec->sid = sid;
1090 isec->initialized = 1;
1091 inode->i_fop = &sel_bool_ops;
1092 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1093 d_add(dentry, inode);
1094 }
1095 bool_num = num;
1096 bool_pending_names = names;
1097 bool_pending_values = values;
1098 out:
1099 free_page((unsigned long)page);
1100 return ret;
1101 err:
1102 if (names) {
1103 for (i = 0; i < num; i++)
1104 kfree(names[i]);
1105 kfree(names);
1106 }
1107 kfree(values);
1108 sel_remove_entries(dir);
1109 ret = -ENOMEM;
1110 goto out;
1111 }
1112
1113 #define NULL_FILE_NAME "null"
1114
1115 struct dentry *selinux_null = NULL;
1116
1117 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1118 size_t count, loff_t *ppos)
1119 {
1120 char tmpbuf[TMPBUFLEN];
1121 ssize_t length;
1122
1123 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1124 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1125 }
1126
1127 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1128 const char __user * buf,
1129 size_t count, loff_t *ppos)
1130
1131 {
1132 char *page;
1133 ssize_t ret;
1134 int new_value;
1135
1136 if (count >= PAGE_SIZE) {
1137 ret = -ENOMEM;
1138 goto out;
1139 }
1140
1141 if (*ppos != 0) {
1142 /* No partial writes. */
1143 ret = -EINVAL;
1144 goto out;
1145 }
1146
1147 page = (char*)get_zeroed_page(GFP_KERNEL);
1148 if (!page) {
1149 ret = -ENOMEM;
1150 goto out;
1151 }
1152
1153 if (copy_from_user(page, buf, count)) {
1154 ret = -EFAULT;
1155 goto out_free;
1156 }
1157
1158 if (sscanf(page, "%u", &new_value) != 1) {
1159 ret = -EINVAL;
1160 goto out;
1161 }
1162
1163 if (new_value != avc_cache_threshold) {
1164 ret = task_has_security(current, SECURITY__SETSECPARAM);
1165 if (ret)
1166 goto out_free;
1167 avc_cache_threshold = new_value;
1168 }
1169 ret = count;
1170 out_free:
1171 free_page((unsigned long)page);
1172 out:
1173 return ret;
1174 }
1175
1176 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1177 size_t count, loff_t *ppos)
1178 {
1179 char *page;
1180 ssize_t ret = 0;
1181
1182 page = (char *)__get_free_page(GFP_KERNEL);
1183 if (!page) {
1184 ret = -ENOMEM;
1185 goto out;
1186 }
1187 ret = avc_get_hash_stats(page);
1188 if (ret >= 0)
1189 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1190 free_page((unsigned long)page);
1191 out:
1192 return ret;
1193 }
1194
1195 static const struct file_operations sel_avc_cache_threshold_ops = {
1196 .read = sel_read_avc_cache_threshold,
1197 .write = sel_write_avc_cache_threshold,
1198 };
1199
1200 static const struct file_operations sel_avc_hash_stats_ops = {
1201 .read = sel_read_avc_hash_stats,
1202 };
1203
1204 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1205 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1206 {
1207 int cpu;
1208
1209 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1210 if (!cpu_possible(cpu))
1211 continue;
1212 *idx = cpu + 1;
1213 return &per_cpu(avc_cache_stats, cpu);
1214 }
1215 return NULL;
1216 }
1217
1218 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1219 {
1220 loff_t n = *pos - 1;
1221
1222 if (*pos == 0)
1223 return SEQ_START_TOKEN;
1224
1225 return sel_avc_get_stat_idx(&n);
1226 }
1227
1228 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1229 {
1230 return sel_avc_get_stat_idx(pos);
1231 }
1232
1233 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1234 {
1235 struct avc_cache_stats *st = v;
1236
1237 if (v == SEQ_START_TOKEN)
1238 seq_printf(seq, "lookups hits misses allocations reclaims "
1239 "frees\n");
1240 else
1241 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1242 st->hits, st->misses, st->allocations,
1243 st->reclaims, st->frees);
1244 return 0;
1245 }
1246
1247 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1248 { }
1249
1250 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1251 .start = sel_avc_stats_seq_start,
1252 .next = sel_avc_stats_seq_next,
1253 .show = sel_avc_stats_seq_show,
1254 .stop = sel_avc_stats_seq_stop,
1255 };
1256
1257 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1258 {
1259 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1260 }
1261
1262 static const struct file_operations sel_avc_cache_stats_ops = {
1263 .open = sel_open_avc_cache_stats,
1264 .read = seq_read,
1265 .llseek = seq_lseek,
1266 .release = seq_release,
1267 };
1268 #endif
1269
1270 static int sel_make_avc_files(struct dentry *dir)
1271 {
1272 int i, ret = 0;
1273 static struct tree_descr files[] = {
1274 { "cache_threshold",
1275 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1276 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1277 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1278 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1279 #endif
1280 };
1281
1282 for (i = 0; i < ARRAY_SIZE(files); i++) {
1283 struct inode *inode;
1284 struct dentry *dentry;
1285
1286 dentry = d_alloc_name(dir, files[i].name);
1287 if (!dentry) {
1288 ret = -ENOMEM;
1289 goto out;
1290 }
1291
1292 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1293 if (!inode) {
1294 ret = -ENOMEM;
1295 goto out;
1296 }
1297 inode->i_fop = files[i].ops;
1298 inode->i_ino = ++sel_last_ino;
1299 d_add(dentry, inode);
1300 }
1301 out:
1302 return ret;
1303 }
1304
1305 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1306 size_t count, loff_t *ppos)
1307 {
1308 struct inode *inode;
1309 char *con;
1310 u32 sid, len;
1311 ssize_t ret;
1312
1313 inode = file->f_path.dentry->d_inode;
1314 sid = inode->i_ino&SEL_INO_MASK;
1315 ret = security_sid_to_context(sid, &con, &len);
1316 if (ret < 0)
1317 return ret;
1318
1319 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1320 kfree(con);
1321 return ret;
1322 }
1323
1324 static const struct file_operations sel_initcon_ops = {
1325 .read = sel_read_initcon,
1326 };
1327
1328 static int sel_make_initcon_files(struct dentry *dir)
1329 {
1330 int i, ret = 0;
1331
1332 for (i = 1; i <= SECINITSID_NUM; i++) {
1333 struct inode *inode;
1334 struct dentry *dentry;
1335 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1336 if (!dentry) {
1337 ret = -ENOMEM;
1338 goto out;
1339 }
1340
1341 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1342 if (!inode) {
1343 ret = -ENOMEM;
1344 goto out;
1345 }
1346 inode->i_fop = &sel_initcon_ops;
1347 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1348 d_add(dentry, inode);
1349 }
1350 out:
1351 return ret;
1352 }
1353
1354 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1355 {
1356 return a / b - (a % b < 0);
1357 }
1358
1359 static inline unsigned long sel_class_to_ino(u16 class)
1360 {
1361 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1362 }
1363
1364 static inline u16 sel_ino_to_class(unsigned long ino)
1365 {
1366 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1367 }
1368
1369 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1370 {
1371 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1372 }
1373
1374 static inline u32 sel_ino_to_perm(unsigned long ino)
1375 {
1376 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1377 }
1378
1379 static ssize_t sel_read_class(struct file * file, char __user *buf,
1380 size_t count, loff_t *ppos)
1381 {
1382 ssize_t rc, len;
1383 char *page;
1384 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1385
1386 page = (char *)__get_free_page(GFP_KERNEL);
1387 if (!page) {
1388 rc = -ENOMEM;
1389 goto out;
1390 }
1391
1392 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1393 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1394 free_page((unsigned long)page);
1395 out:
1396 return rc;
1397 }
1398
1399 static const struct file_operations sel_class_ops = {
1400 .read = sel_read_class,
1401 };
1402
1403 static ssize_t sel_read_perm(struct file * file, char __user *buf,
1404 size_t count, loff_t *ppos)
1405 {
1406 ssize_t rc, len;
1407 char *page;
1408 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1409
1410 page = (char *)__get_free_page(GFP_KERNEL);
1411 if (!page) {
1412 rc = -ENOMEM;
1413 goto out;
1414 }
1415
1416 len = snprintf(page, PAGE_SIZE,"%d", sel_ino_to_perm(ino));
1417 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1418 free_page((unsigned long)page);
1419 out:
1420 return rc;
1421 }
1422
1423 static const struct file_operations sel_perm_ops = {
1424 .read = sel_read_perm,
1425 };
1426
1427 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1428 size_t count, loff_t *ppos)
1429 {
1430 int value;
1431 char tmpbuf[TMPBUFLEN];
1432 ssize_t length;
1433 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1434
1435 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1436 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1437
1438 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1439 }
1440
1441 static const struct file_operations sel_policycap_ops = {
1442 .read = sel_read_policycap,
1443 };
1444
1445 static int sel_make_perm_files(char *objclass, int classvalue,
1446 struct dentry *dir)
1447 {
1448 int i, rc = 0, nperms;
1449 char **perms;
1450
1451 rc = security_get_permissions(objclass, &perms, &nperms);
1452 if (rc)
1453 goto out;
1454
1455 for (i = 0; i < nperms; i++) {
1456 struct inode *inode;
1457 struct dentry *dentry;
1458
1459 dentry = d_alloc_name(dir, perms[i]);
1460 if (!dentry) {
1461 rc = -ENOMEM;
1462 goto out1;
1463 }
1464
1465 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1466 if (!inode) {
1467 rc = -ENOMEM;
1468 goto out1;
1469 }
1470 inode->i_fop = &sel_perm_ops;
1471 /* i+1 since perm values are 1-indexed */
1472 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1473 d_add(dentry, inode);
1474 }
1475
1476 out1:
1477 for (i = 0; i < nperms; i++)
1478 kfree(perms[i]);
1479 kfree(perms);
1480 out:
1481 return rc;
1482 }
1483
1484 static int sel_make_class_dir_entries(char *classname, int index,
1485 struct dentry *dir)
1486 {
1487 struct dentry *dentry = NULL;
1488 struct inode *inode = NULL;
1489 int rc;
1490
1491 dentry = d_alloc_name(dir, "index");
1492 if (!dentry) {
1493 rc = -ENOMEM;
1494 goto out;
1495 }
1496
1497 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1498 if (!inode) {
1499 rc = -ENOMEM;
1500 goto out;
1501 }
1502
1503 inode->i_fop = &sel_class_ops;
1504 inode->i_ino = sel_class_to_ino(index);
1505 d_add(dentry, inode);
1506
1507 dentry = d_alloc_name(dir, "perms");
1508 if (!dentry) {
1509 rc = -ENOMEM;
1510 goto out;
1511 }
1512
1513 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1514 if (rc)
1515 goto out;
1516
1517 rc = sel_make_perm_files(classname, index, dentry);
1518
1519 out:
1520 return rc;
1521 }
1522
1523 static void sel_remove_classes(void)
1524 {
1525 struct list_head *class_node;
1526
1527 list_for_each(class_node, &class_dir->d_subdirs) {
1528 struct dentry *class_subdir = list_entry(class_node,
1529 struct dentry, d_u.d_child);
1530 struct list_head *class_subdir_node;
1531
1532 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1533 struct dentry *d = list_entry(class_subdir_node,
1534 struct dentry, d_u.d_child);
1535
1536 if (d->d_inode)
1537 if (d->d_inode->i_mode & S_IFDIR)
1538 sel_remove_entries(d);
1539 }
1540
1541 sel_remove_entries(class_subdir);
1542 }
1543
1544 sel_remove_entries(class_dir);
1545 }
1546
1547 static int sel_make_classes(void)
1548 {
1549 int rc = 0, nclasses, i;
1550 char **classes;
1551
1552 /* delete any existing entries */
1553 sel_remove_classes();
1554
1555 rc = security_get_classes(&classes, &nclasses);
1556 if (rc < 0)
1557 goto out;
1558
1559 /* +2 since classes are 1-indexed */
1560 last_class_ino = sel_class_to_ino(nclasses+2);
1561
1562 for (i = 0; i < nclasses; i++) {
1563 struct dentry *class_name_dir;
1564
1565 class_name_dir = d_alloc_name(class_dir, classes[i]);
1566 if (!class_name_dir) {
1567 rc = -ENOMEM;
1568 goto out1;
1569 }
1570
1571 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1572 &last_class_ino);
1573 if (rc)
1574 goto out1;
1575
1576 /* i+1 since class values are 1-indexed */
1577 rc = sel_make_class_dir_entries(classes[i], i+1,
1578 class_name_dir);
1579 if (rc)
1580 goto out1;
1581 }
1582
1583 out1:
1584 for (i = 0; i < nclasses; i++)
1585 kfree(classes[i]);
1586 kfree(classes);
1587 out:
1588 return rc;
1589 }
1590
1591 static int sel_make_policycap(void)
1592 {
1593 unsigned int iter;
1594 struct dentry *dentry = NULL;
1595 struct inode *inode = NULL;
1596
1597 sel_remove_entries(policycap_dir);
1598
1599 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1600 if (iter < ARRAY_SIZE(policycap_names))
1601 dentry = d_alloc_name(policycap_dir,
1602 policycap_names[iter]);
1603 else
1604 dentry = d_alloc_name(policycap_dir, "unknown");
1605
1606 if (dentry == NULL)
1607 return -ENOMEM;
1608
1609 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1610 if (inode == NULL)
1611 return -ENOMEM;
1612
1613 inode->i_fop = &sel_policycap_ops;
1614 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1615 d_add(dentry, inode);
1616 }
1617
1618 return 0;
1619 }
1620
1621 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1622 unsigned long *ino)
1623 {
1624 int ret = 0;
1625 struct inode *inode;
1626
1627 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1628 if (!inode) {
1629 ret = -ENOMEM;
1630 goto out;
1631 }
1632 inode->i_op = &simple_dir_inode_operations;
1633 inode->i_fop = &simple_dir_operations;
1634 inode->i_ino = ++(*ino);
1635 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1636 inc_nlink(inode);
1637 d_add(dentry, inode);
1638 /* bump link count on parent directory, too */
1639 inc_nlink(dir);
1640 out:
1641 return ret;
1642 }
1643
1644 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1645 {
1646 int ret;
1647 struct dentry *dentry;
1648 struct inode *inode, *root_inode;
1649 struct inode_security_struct *isec;
1650
1651 static struct tree_descr selinux_files[] = {
1652 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1653 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1654 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1655 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1656 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1657 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1658 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1659 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1660 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1661 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1662 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1663 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1664 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1665 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1666 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1667 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1668 /* last one */ {""}
1669 };
1670 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1671 if (ret)
1672 goto err;
1673
1674 root_inode = sb->s_root->d_inode;
1675
1676 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1677 if (!dentry) {
1678 ret = -ENOMEM;
1679 goto err;
1680 }
1681
1682 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1683 if (ret)
1684 goto err;
1685
1686 bool_dir = dentry;
1687
1688 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1689 if (!dentry) {
1690 ret = -ENOMEM;
1691 goto err;
1692 }
1693
1694 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1695 if (!inode) {
1696 ret = -ENOMEM;
1697 goto err;
1698 }
1699 inode->i_ino = ++sel_last_ino;
1700 isec = (struct inode_security_struct*)inode->i_security;
1701 isec->sid = SECINITSID_DEVNULL;
1702 isec->sclass = SECCLASS_CHR_FILE;
1703 isec->initialized = 1;
1704
1705 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1706 d_add(dentry, inode);
1707 selinux_null = dentry;
1708
1709 dentry = d_alloc_name(sb->s_root, "avc");
1710 if (!dentry) {
1711 ret = -ENOMEM;
1712 goto err;
1713 }
1714
1715 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1716 if (ret)
1717 goto err;
1718
1719 ret = sel_make_avc_files(dentry);
1720 if (ret)
1721 goto err;
1722
1723 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1724 if (!dentry) {
1725 ret = -ENOMEM;
1726 goto err;
1727 }
1728
1729 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1730 if (ret)
1731 goto err;
1732
1733 ret = sel_make_initcon_files(dentry);
1734 if (ret)
1735 goto err;
1736
1737 dentry = d_alloc_name(sb->s_root, "class");
1738 if (!dentry) {
1739 ret = -ENOMEM;
1740 goto err;
1741 }
1742
1743 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1744 if (ret)
1745 goto err;
1746
1747 class_dir = dentry;
1748
1749 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1750 if (!dentry) {
1751 ret = -ENOMEM;
1752 goto err;
1753 }
1754
1755 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1756 if (ret)
1757 goto err;
1758
1759 policycap_dir = dentry;
1760
1761 out:
1762 return ret;
1763 err:
1764 printk(KERN_ERR "%s: failed while creating inodes\n", __func__);
1765 goto out;
1766 }
1767
1768 static int sel_get_sb(struct file_system_type *fs_type,
1769 int flags, const char *dev_name, void *data,
1770 struct vfsmount *mnt)
1771 {
1772 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1773 }
1774
1775 static struct file_system_type sel_fs_type = {
1776 .name = "selinuxfs",
1777 .get_sb = sel_get_sb,
1778 .kill_sb = kill_litter_super,
1779 };
1780
1781 struct vfsmount *selinuxfs_mount;
1782
1783 static int __init init_sel_fs(void)
1784 {
1785 int err;
1786
1787 if (!selinux_enabled)
1788 return 0;
1789 err = register_filesystem(&sel_fs_type);
1790 if (!err) {
1791 selinuxfs_mount = kern_mount(&sel_fs_type);
1792 if (IS_ERR(selinuxfs_mount)) {
1793 printk(KERN_ERR "selinuxfs: could not mount!\n");
1794 err = PTR_ERR(selinuxfs_mount);
1795 selinuxfs_mount = NULL;
1796 }
1797 }
1798 return err;
1799 }
1800
1801 __initcall(init_sel_fs);
1802
1803 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1804 void exit_sel_fs(void)
1805 {
1806 unregister_filesystem(&sel_fs_type);
1807 }
1808 #endif
Support for the Chinese Samsung S3C2440 based development boards