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