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