b7bb0f5ec07c7348f1f836724f25cae06a1178a3
[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         struct av_decision avd;
498         ssize_t length;
499
500         length = task_has_security(current, SECURITY__COMPUTE_AV);
501         if (length)
502                 return length;
503
504         length = -ENOMEM;
505         scon = kzalloc(size+1, GFP_KERNEL);
506         if (!scon)
507                 return length;
508
509         tcon = kzalloc(size+1, GFP_KERNEL);
510         if (!tcon)
511                 goto out;
512
513         length = -EINVAL;
514         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
515                 goto out2;
516
517         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
518         if (length < 0)
519                 goto out2;
520         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
521         if (length < 0)
522                 goto out2;
523
524         security_compute_av_user(ssid, tsid, tclass, &avd);
525
526         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
527                           "%x %x %x %x %u %x",
528                           avd.allowed, 0xffffffff,
529                           avd.auditallow, avd.auditdeny,
530                           avd.seqno, avd.flags);
531 out2:
532         kfree(tcon);
533 out:
534         kfree(scon);
535         return length;
536 }
537
538 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
539 {
540         char *scon, *tcon;
541         u32 ssid, tsid, newsid;
542         u16 tclass;
543         ssize_t length;
544         char *newcon;
545         u32 len;
546
547         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
548         if (length)
549                 return length;
550
551         length = -ENOMEM;
552         scon = kzalloc(size+1, GFP_KERNEL);
553         if (!scon)
554                 return length;
555
556         tcon = kzalloc(size+1, GFP_KERNEL);
557         if (!tcon)
558                 goto out;
559
560         length = -EINVAL;
561         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
562                 goto out2;
563
564         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
565         if (length < 0)
566                 goto out2;
567         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
568         if (length < 0)
569                 goto out2;
570
571         length = security_transition_sid_user(ssid, tsid, tclass, &newsid);
572         if (length < 0)
573                 goto out2;
574
575         length = security_sid_to_context(newsid, &newcon, &len);
576         if (length < 0)
577                 goto out2;
578
579         if (len > SIMPLE_TRANSACTION_LIMIT) {
580                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
581                         "payload max\n", __func__, len);
582                 length = -ERANGE;
583                 goto out3;
584         }
585
586         memcpy(buf, newcon, len);
587         length = len;
588 out3:
589         kfree(newcon);
590 out2:
591         kfree(tcon);
592 out:
593         kfree(scon);
594         return length;
595 }
596
597 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
598 {
599         char *scon, *tcon;
600         u32 ssid, tsid, newsid;
601         u16 tclass;
602         ssize_t length;
603         char *newcon;
604         u32 len;
605
606         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
607         if (length)
608                 return length;
609
610         length = -ENOMEM;
611         scon = kzalloc(size+1, GFP_KERNEL);
612         if (!scon)
613                 return length;
614
615         tcon = kzalloc(size+1, GFP_KERNEL);
616         if (!tcon)
617                 goto out;
618
619         length = -EINVAL;
620         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
621                 goto out2;
622
623         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
624         if (length < 0)
625                 goto out2;
626         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
627         if (length < 0)
628                 goto out2;
629
630         length = security_change_sid(ssid, tsid, tclass, &newsid);
631         if (length < 0)
632                 goto out2;
633
634         length = security_sid_to_context(newsid, &newcon, &len);
635         if (length < 0)
636                 goto out2;
637
638         if (len > SIMPLE_TRANSACTION_LIMIT) {
639                 length = -ERANGE;
640                 goto out3;
641         }
642
643         memcpy(buf, newcon, len);
644         length = len;
645 out3:
646         kfree(newcon);
647 out2:
648         kfree(tcon);
649 out:
650         kfree(scon);
651         return length;
652 }
653
654 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
655 {
656         char *con, *user, *ptr;
657         u32 sid, *sids;
658         ssize_t length;
659         char *newcon;
660         int i, rc;
661         u32 len, nsids;
662
663         length = task_has_security(current, SECURITY__COMPUTE_USER);
664         if (length)
665                 return length;
666
667         length = -ENOMEM;
668         con = kzalloc(size+1, GFP_KERNEL);
669         if (!con)
670                 return length;
671
672         user = kzalloc(size+1, GFP_KERNEL);
673         if (!user)
674                 goto out;
675
676         length = -EINVAL;
677         if (sscanf(buf, "%s %s", con, user) != 2)
678                 goto out2;
679
680         length = security_context_to_sid(con, strlen(con)+1, &sid);
681         if (length < 0)
682                 goto out2;
683
684         length = security_get_user_sids(sid, user, &sids, &nsids);
685         if (length < 0)
686                 goto out2;
687
688         length = sprintf(buf, "%u", nsids) + 1;
689         ptr = buf + length;
690         for (i = 0; i < nsids; i++) {
691                 rc = security_sid_to_context(sids[i], &newcon, &len);
692                 if (rc) {
693                         length = rc;
694                         goto out3;
695                 }
696                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
697                         kfree(newcon);
698                         length = -ERANGE;
699                         goto out3;
700                 }
701                 memcpy(ptr, newcon, len);
702                 kfree(newcon);
703                 ptr += len;
704                 length += len;
705         }
706 out3:
707         kfree(sids);
708 out2:
709         kfree(user);
710 out:
711         kfree(con);
712         return length;
713 }
714
715 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
716 {
717         char *scon, *tcon;
718         u32 ssid, tsid, newsid;
719         u16 tclass;
720         ssize_t length;
721         char *newcon;
722         u32 len;
723
724         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
725         if (length)
726                 return length;
727
728         length = -ENOMEM;
729         scon = kzalloc(size+1, GFP_KERNEL);
730         if (!scon)
731                 return length;
732
733         tcon = kzalloc(size+1, GFP_KERNEL);
734         if (!tcon)
735                 goto out;
736
737         length = -EINVAL;
738         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
739                 goto out2;
740
741         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
742         if (length < 0)
743                 goto out2;
744         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
745         if (length < 0)
746                 goto out2;
747
748         length = security_member_sid(ssid, tsid, tclass, &newsid);
749         if (length < 0)
750                 goto out2;
751
752         length = security_sid_to_context(newsid, &newcon, &len);
753         if (length < 0)
754                 goto out2;
755
756         if (len > SIMPLE_TRANSACTION_LIMIT) {
757                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
758                         "payload max\n", __func__, len);
759                 length = -ERANGE;
760                 goto out3;
761         }
762
763         memcpy(buf, newcon, len);
764         length = len;
765 out3:
766         kfree(newcon);
767 out2:
768         kfree(tcon);
769 out:
770         kfree(scon);
771         return length;
772 }
773
774 static struct inode *sel_make_inode(struct super_block *sb, int mode)
775 {
776         struct inode *ret = new_inode(sb);
777
778         if (ret) {
779                 ret->i_mode = mode;
780                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
781         }
782         return ret;
783 }
784
785 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
786                              size_t count, loff_t *ppos)
787 {
788         char *page = NULL;
789         ssize_t length;
790         ssize_t ret;
791         int cur_enforcing;
792         struct inode *inode = filep->f_path.dentry->d_inode;
793         unsigned index = inode->i_ino & SEL_INO_MASK;
794         const char *name = filep->f_path.dentry->d_name.name;
795
796         mutex_lock(&sel_mutex);
797
798         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
799                 ret = -EINVAL;
800                 goto out;
801         }
802
803         page = (char *)get_zeroed_page(GFP_KERNEL);
804         if (!page) {
805                 ret = -ENOMEM;
806                 goto out;
807         }
808
809         cur_enforcing = security_get_bool_value(index);
810         if (cur_enforcing < 0) {
811                 ret = cur_enforcing;
812                 goto out;
813         }
814         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
815                           bool_pending_values[index]);
816         ret = simple_read_from_buffer(buf, count, ppos, page, length);
817 out:
818         mutex_unlock(&sel_mutex);
819         if (page)
820                 free_page((unsigned long)page);
821         return ret;
822 }
823
824 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
825                               size_t count, loff_t *ppos)
826 {
827         char *page = NULL;
828         ssize_t length;
829         int new_value;
830         struct inode *inode = filep->f_path.dentry->d_inode;
831         unsigned index = inode->i_ino & SEL_INO_MASK;
832         const char *name = filep->f_path.dentry->d_name.name;
833
834         mutex_lock(&sel_mutex);
835
836         length = task_has_security(current, SECURITY__SETBOOL);
837         if (length)
838                 goto out;
839
840         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
841                 length = -EINVAL;
842                 goto out;
843         }
844
845         if (count >= PAGE_SIZE) {
846                 length = -ENOMEM;
847                 goto out;
848         }
849
850         if (*ppos != 0) {
851                 /* No partial writes. */
852                 length = -EINVAL;
853                 goto out;
854         }
855         page = (char *)get_zeroed_page(GFP_KERNEL);
856         if (!page) {
857                 length = -ENOMEM;
858                 goto out;
859         }
860
861         length = -EFAULT;
862         if (copy_from_user(page, buf, count))
863                 goto out;
864
865         length = -EINVAL;
866         if (sscanf(page, "%d", &new_value) != 1)
867                 goto out;
868
869         if (new_value)
870                 new_value = 1;
871
872         bool_pending_values[index] = new_value;
873         length = count;
874
875 out:
876         mutex_unlock(&sel_mutex);
877         if (page)
878                 free_page((unsigned long) page);
879         return length;
880 }
881
882 static const struct file_operations sel_bool_ops = {
883         .read           = sel_read_bool,
884         .write          = sel_write_bool,
885 };
886
887 static ssize_t sel_commit_bools_write(struct file *filep,
888                                       const char __user *buf,
889                                       size_t count, loff_t *ppos)
890 {
891         char *page = NULL;
892         ssize_t length;
893         int new_value;
894
895         mutex_lock(&sel_mutex);
896
897         length = task_has_security(current, SECURITY__SETBOOL);
898         if (length)
899                 goto out;
900
901         if (count >= PAGE_SIZE) {
902                 length = -ENOMEM;
903                 goto out;
904         }
905         if (*ppos != 0) {
906                 /* No partial writes. */
907                 goto out;
908         }
909         page = (char *)get_zeroed_page(GFP_KERNEL);
910         if (!page) {
911                 length = -ENOMEM;
912                 goto out;
913         }
914
915         length = -EFAULT;
916         if (copy_from_user(page, buf, count))
917                 goto out;
918
919         length = -EINVAL;
920         if (sscanf(page, "%d", &new_value) != 1)
921                 goto out;
922
923         if (new_value && bool_pending_values)
924                 security_set_bools(bool_num, bool_pending_values);
925
926         length = count;
927
928 out:
929         mutex_unlock(&sel_mutex);
930         if (page)
931                 free_page((unsigned long) page);
932         return length;
933 }
934
935 static const struct file_operations sel_commit_bools_ops = {
936         .write          = sel_commit_bools_write,
937 };
938
939 static void sel_remove_entries(struct dentry *de)
940 {
941         struct list_head *node;
942
943         spin_lock(&dcache_lock);
944         node = de->d_subdirs.next;
945         while (node != &de->d_subdirs) {
946                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
947                 list_del_init(node);
948
949                 if (d->d_inode) {
950                         d = dget_locked(d);
951                         spin_unlock(&dcache_lock);
952                         d_delete(d);
953                         simple_unlink(de->d_inode, d);
954                         dput(d);
955                         spin_lock(&dcache_lock);
956                 }
957                 node = de->d_subdirs.next;
958         }
959
960         spin_unlock(&dcache_lock);
961 }
962
963 #define BOOL_DIR_NAME "booleans"
964
965 static int sel_make_bools(void)
966 {
967         int i, ret = 0;
968         ssize_t len;
969         struct dentry *dentry = NULL;
970         struct dentry *dir = bool_dir;
971         struct inode *inode = NULL;
972         struct inode_security_struct *isec;
973         char **names = NULL, *page;
974         int num;
975         int *values = NULL;
976         u32 sid;
977
978         /* remove any existing files */
979         kfree(bool_pending_names);
980         kfree(bool_pending_values);
981         bool_pending_names = NULL;
982         bool_pending_values = NULL;
983
984         sel_remove_entries(dir);
985
986         page = (char *)get_zeroed_page(GFP_KERNEL);
987         if (!page)
988                 return -ENOMEM;
989
990         ret = security_get_bools(&num, &names, &values);
991         if (ret != 0)
992                 goto out;
993
994         for (i = 0; i < num; i++) {
995                 dentry = d_alloc_name(dir, names[i]);
996                 if (!dentry) {
997                         ret = -ENOMEM;
998                         goto err;
999                 }
1000                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1001                 if (!inode) {
1002                         ret = -ENOMEM;
1003                         goto err;
1004                 }
1005
1006                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1007                 if (len < 0) {
1008                         ret = -EINVAL;
1009                         goto err;
1010                 } else if (len >= PAGE_SIZE) {
1011                         ret = -ENAMETOOLONG;
1012                         goto err;
1013                 }
1014                 isec = (struct inode_security_struct *)inode->i_security;
1015                 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1016                 if (ret)
1017                         goto err;
1018                 isec->sid = sid;
1019                 isec->initialized = 1;
1020                 inode->i_fop = &sel_bool_ops;
1021                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1022                 d_add(dentry, inode);
1023         }
1024         bool_num = num;
1025         bool_pending_names = names;
1026         bool_pending_values = values;
1027 out:
1028         free_page((unsigned long)page);
1029         return ret;
1030 err:
1031         if (names) {
1032                 for (i = 0; i < num; i++)
1033                         kfree(names[i]);
1034                 kfree(names);
1035         }
1036         kfree(values);
1037         sel_remove_entries(dir);
1038         ret = -ENOMEM;
1039         goto out;
1040 }
1041
1042 #define NULL_FILE_NAME "null"
1043
1044 struct dentry *selinux_null;
1045
1046 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1047                                             size_t count, loff_t *ppos)
1048 {
1049         char tmpbuf[TMPBUFLEN];
1050         ssize_t length;
1051
1052         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1053         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1054 }
1055
1056 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1057                                              const char __user *buf,
1058                                              size_t count, loff_t *ppos)
1059
1060 {
1061         char *page;
1062         ssize_t ret;
1063         int new_value;
1064
1065         if (count >= PAGE_SIZE) {
1066                 ret = -ENOMEM;
1067                 goto out;
1068         }
1069
1070         if (*ppos != 0) {
1071                 /* No partial writes. */
1072                 ret = -EINVAL;
1073                 goto out;
1074         }
1075
1076         page = (char *)get_zeroed_page(GFP_KERNEL);
1077         if (!page) {
1078                 ret = -ENOMEM;
1079                 goto out;
1080         }
1081
1082         if (copy_from_user(page, buf, count)) {
1083                 ret = -EFAULT;
1084                 goto out_free;
1085         }
1086
1087         if (sscanf(page, "%u", &new_value) != 1) {
1088                 ret = -EINVAL;
1089                 goto out;
1090         }
1091
1092         if (new_value != avc_cache_threshold) {
1093                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1094                 if (ret)
1095                         goto out_free;
1096                 avc_cache_threshold = new_value;
1097         }
1098         ret = count;
1099 out_free:
1100         free_page((unsigned long)page);
1101 out:
1102         return ret;
1103 }
1104
1105 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1106                                        size_t count, loff_t *ppos)
1107 {
1108         char *page;
1109         ssize_t ret = 0;
1110
1111         page = (char *)__get_free_page(GFP_KERNEL);
1112         if (!page) {
1113                 ret = -ENOMEM;
1114                 goto out;
1115         }
1116         ret = avc_get_hash_stats(page);
1117         if (ret >= 0)
1118                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1119         free_page((unsigned long)page);
1120 out:
1121         return ret;
1122 }
1123
1124 static const struct file_operations sel_avc_cache_threshold_ops = {
1125         .read           = sel_read_avc_cache_threshold,
1126         .write          = sel_write_avc_cache_threshold,
1127 };
1128
1129 static const struct file_operations sel_avc_hash_stats_ops = {
1130         .read           = sel_read_avc_hash_stats,
1131 };
1132
1133 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1134 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1135 {
1136         int cpu;
1137
1138         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1139                 if (!cpu_possible(cpu))
1140                         continue;
1141                 *idx = cpu + 1;
1142                 return &per_cpu(avc_cache_stats, cpu);
1143         }
1144         return NULL;
1145 }
1146
1147 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1148 {
1149         loff_t n = *pos - 1;
1150
1151         if (*pos == 0)
1152                 return SEQ_START_TOKEN;
1153
1154         return sel_avc_get_stat_idx(&n);
1155 }
1156
1157 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1158 {
1159         return sel_avc_get_stat_idx(pos);
1160 }
1161
1162 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1163 {
1164         struct avc_cache_stats *st = v;
1165
1166         if (v == SEQ_START_TOKEN)
1167                 seq_printf(seq, "lookups hits misses allocations reclaims "
1168                            "frees\n");
1169         else
1170                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1171                            st->hits, st->misses, st->allocations,
1172                            st->reclaims, st->frees);
1173         return 0;
1174 }
1175
1176 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1177 { }
1178
1179 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1180         .start          = sel_avc_stats_seq_start,
1181         .next           = sel_avc_stats_seq_next,
1182         .show           = sel_avc_stats_seq_show,
1183         .stop           = sel_avc_stats_seq_stop,
1184 };
1185
1186 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1187 {
1188         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1189 }
1190
1191 static const struct file_operations sel_avc_cache_stats_ops = {
1192         .open           = sel_open_avc_cache_stats,
1193         .read           = seq_read,
1194         .llseek         = seq_lseek,
1195         .release        = seq_release,
1196 };
1197 #endif
1198
1199 static int sel_make_avc_files(struct dentry *dir)
1200 {
1201         int i, ret = 0;
1202         static struct tree_descr files[] = {
1203                 { "cache_threshold",
1204                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1205                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1206 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1207                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1208 #endif
1209         };
1210
1211         for (i = 0; i < ARRAY_SIZE(files); i++) {
1212                 struct inode *inode;
1213                 struct dentry *dentry;
1214
1215                 dentry = d_alloc_name(dir, files[i].name);
1216                 if (!dentry) {
1217                         ret = -ENOMEM;
1218                         goto out;
1219                 }
1220
1221                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1222                 if (!inode) {
1223                         ret = -ENOMEM;
1224                         goto out;
1225                 }
1226                 inode->i_fop = files[i].ops;
1227                 inode->i_ino = ++sel_last_ino;
1228                 d_add(dentry, inode);
1229         }
1230 out:
1231         return ret;
1232 }
1233
1234 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1235                                 size_t count, loff_t *ppos)
1236 {
1237         struct inode *inode;
1238         char *con;
1239         u32 sid, len;
1240         ssize_t ret;
1241
1242         inode = file->f_path.dentry->d_inode;
1243         sid = inode->i_ino&SEL_INO_MASK;
1244         ret = security_sid_to_context(sid, &con, &len);
1245         if (ret < 0)
1246                 return ret;
1247
1248         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1249         kfree(con);
1250         return ret;
1251 }
1252
1253 static const struct file_operations sel_initcon_ops = {
1254         .read           = sel_read_initcon,
1255 };
1256
1257 static int sel_make_initcon_files(struct dentry *dir)
1258 {
1259         int i, ret = 0;
1260
1261         for (i = 1; i <= SECINITSID_NUM; i++) {
1262                 struct inode *inode;
1263                 struct dentry *dentry;
1264                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1265                 if (!dentry) {
1266                         ret = -ENOMEM;
1267                         goto out;
1268                 }
1269
1270                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1271                 if (!inode) {
1272                         ret = -ENOMEM;
1273                         goto out;
1274                 }
1275                 inode->i_fop = &sel_initcon_ops;
1276                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1277                 d_add(dentry, inode);
1278         }
1279 out:
1280         return ret;
1281 }
1282
1283 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1284 {
1285         return a / b - (a % b < 0);
1286 }
1287
1288 static inline unsigned long sel_class_to_ino(u16 class)
1289 {
1290         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1291 }
1292
1293 static inline u16 sel_ino_to_class(unsigned long ino)
1294 {
1295         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1296 }
1297
1298 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1299 {
1300         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1301 }
1302
1303 static inline u32 sel_ino_to_perm(unsigned long ino)
1304 {
1305         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1306 }
1307
1308 static ssize_t sel_read_class(struct file *file, char __user *buf,
1309                                 size_t count, loff_t *ppos)
1310 {
1311         ssize_t rc, len;
1312         char *page;
1313         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1314
1315         page = (char *)__get_free_page(GFP_KERNEL);
1316         if (!page) {
1317                 rc = -ENOMEM;
1318                 goto out;
1319         }
1320
1321         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1322         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1323         free_page((unsigned long)page);
1324 out:
1325         return rc;
1326 }
1327
1328 static const struct file_operations sel_class_ops = {
1329         .read           = sel_read_class,
1330 };
1331
1332 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1333                                 size_t count, loff_t *ppos)
1334 {
1335         ssize_t rc, len;
1336         char *page;
1337         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1338
1339         page = (char *)__get_free_page(GFP_KERNEL);
1340         if (!page) {
1341                 rc = -ENOMEM;
1342                 goto out;
1343         }
1344
1345         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1346         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1347         free_page((unsigned long)page);
1348 out:
1349         return rc;
1350 }
1351
1352 static const struct file_operations sel_perm_ops = {
1353         .read           = sel_read_perm,
1354 };
1355
1356 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1357                                   size_t count, loff_t *ppos)
1358 {
1359         int value;
1360         char tmpbuf[TMPBUFLEN];
1361         ssize_t length;
1362         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1363
1364         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1365         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1366
1367         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1368 }
1369
1370 static const struct file_operations sel_policycap_ops = {
1371         .read           = sel_read_policycap,
1372 };
1373
1374 static int sel_make_perm_files(char *objclass, int classvalue,
1375                                 struct dentry *dir)
1376 {
1377         int i, rc = 0, nperms;
1378         char **perms;
1379
1380         rc = security_get_permissions(objclass, &perms, &nperms);
1381         if (rc)
1382                 goto out;
1383
1384         for (i = 0; i < nperms; i++) {
1385                 struct inode *inode;
1386                 struct dentry *dentry;
1387
1388                 dentry = d_alloc_name(dir, perms[i]);
1389                 if (!dentry) {
1390                         rc = -ENOMEM;
1391                         goto out1;
1392                 }
1393
1394                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1395                 if (!inode) {
1396                         rc = -ENOMEM;
1397                         goto out1;
1398                 }
1399                 inode->i_fop = &sel_perm_ops;
1400                 /* i+1 since perm values are 1-indexed */
1401                 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1402                 d_add(dentry, inode);
1403         }
1404
1405 out1:
1406         for (i = 0; i < nperms; i++)
1407                 kfree(perms[i]);
1408         kfree(perms);
1409 out:
1410         return rc;
1411 }
1412
1413 static int sel_make_class_dir_entries(char *classname, int index,
1414                                         struct dentry *dir)
1415 {
1416         struct dentry *dentry = NULL;
1417         struct inode *inode = NULL;
1418         int rc;
1419
1420         dentry = d_alloc_name(dir, "index");
1421         if (!dentry) {
1422                 rc = -ENOMEM;
1423                 goto out;
1424         }
1425
1426         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1427         if (!inode) {
1428                 rc = -ENOMEM;
1429                 goto out;
1430         }
1431
1432         inode->i_fop = &sel_class_ops;
1433         inode->i_ino = sel_class_to_ino(index);
1434         d_add(dentry, inode);
1435
1436         dentry = d_alloc_name(dir, "perms");
1437         if (!dentry) {
1438                 rc = -ENOMEM;
1439                 goto out;
1440         }
1441
1442         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1443         if (rc)
1444                 goto out;
1445
1446         rc = sel_make_perm_files(classname, index, dentry);
1447
1448 out:
1449         return rc;
1450 }
1451
1452 static void sel_remove_classes(void)
1453 {
1454         struct list_head *class_node;
1455
1456         list_for_each(class_node, &class_dir->d_subdirs) {
1457                 struct dentry *class_subdir = list_entry(class_node,
1458                                         struct dentry, d_u.d_child);
1459                 struct list_head *class_subdir_node;
1460
1461                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1462                         struct dentry *d = list_entry(class_subdir_node,
1463                                                 struct dentry, d_u.d_child);
1464
1465                         if (d->d_inode)
1466                                 if (d->d_inode->i_mode & S_IFDIR)
1467                                         sel_remove_entries(d);
1468                 }
1469
1470                 sel_remove_entries(class_subdir);
1471         }
1472
1473         sel_remove_entries(class_dir);
1474 }
1475
1476 static int sel_make_classes(void)
1477 {
1478         int rc = 0, nclasses, i;
1479         char **classes;
1480
1481         /* delete any existing entries */
1482         sel_remove_classes();
1483
1484         rc = security_get_classes(&classes, &nclasses);
1485         if (rc < 0)
1486                 goto out;
1487
1488         /* +2 since classes are 1-indexed */
1489         last_class_ino = sel_class_to_ino(nclasses+2);
1490
1491         for (i = 0; i < nclasses; i++) {
1492                 struct dentry *class_name_dir;
1493
1494                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1495                 if (!class_name_dir) {
1496                         rc = -ENOMEM;
1497                         goto out1;
1498                 }
1499
1500                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1501                                 &last_class_ino);
1502                 if (rc)
1503                         goto out1;
1504
1505                 /* i+1 since class values are 1-indexed */
1506                 rc = sel_make_class_dir_entries(classes[i], i+1,
1507                                 class_name_dir);
1508                 if (rc)
1509                         goto out1;
1510         }
1511
1512 out1:
1513         for (i = 0; i < nclasses; i++)
1514                 kfree(classes[i]);
1515         kfree(classes);
1516 out:
1517         return rc;
1518 }
1519
1520 static int sel_make_policycap(void)
1521 {
1522         unsigned int iter;
1523         struct dentry *dentry = NULL;
1524         struct inode *inode = NULL;
1525
1526         sel_remove_entries(policycap_dir);
1527
1528         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1529                 if (iter < ARRAY_SIZE(policycap_names))
1530                         dentry = d_alloc_name(policycap_dir,
1531                                               policycap_names[iter]);
1532                 else
1533                         dentry = d_alloc_name(policycap_dir, "unknown");
1534
1535                 if (dentry == NULL)
1536                         return -ENOMEM;
1537
1538                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1539                 if (inode == NULL)
1540                         return -ENOMEM;
1541
1542                 inode->i_fop = &sel_policycap_ops;
1543                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1544                 d_add(dentry, inode);
1545         }
1546
1547         return 0;
1548 }
1549
1550 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1551                         unsigned long *ino)
1552 {
1553         int ret = 0;
1554         struct inode *inode;
1555
1556         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1557         if (!inode) {
1558                 ret = -ENOMEM;
1559                 goto out;
1560         }
1561         inode->i_op = &simple_dir_inode_operations;
1562         inode->i_fop = &simple_dir_operations;
1563         inode->i_ino = ++(*ino);
1564         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1565         inc_nlink(inode);
1566         d_add(dentry, inode);
1567         /* bump link count on parent directory, too */
1568         inc_nlink(dir);
1569 out:
1570         return ret;
1571 }
1572
1573 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1574 {
1575         int ret;
1576         struct dentry *dentry;
1577         struct inode *inode, *root_inode;
1578         struct inode_security_struct *isec;
1579
1580         static struct tree_descr selinux_files[] = {
1581                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1582                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1583                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1584                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1585                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1586                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1587                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1588                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1589                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1590                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1591                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1592                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1593                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1594                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1595                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1596                 /* last one */ {""}
1597         };
1598         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1599         if (ret)
1600                 goto err;
1601
1602         root_inode = sb->s_root->d_inode;
1603
1604         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1605         if (!dentry) {
1606                 ret = -ENOMEM;
1607                 goto err;
1608         }
1609
1610         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1611         if (ret)
1612                 goto err;
1613
1614         bool_dir = dentry;
1615
1616         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1617         if (!dentry) {
1618                 ret = -ENOMEM;
1619                 goto err;
1620         }
1621
1622         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1623         if (!inode) {
1624                 ret = -ENOMEM;
1625                 goto err;
1626         }
1627         inode->i_ino = ++sel_last_ino;
1628         isec = (struct inode_security_struct *)inode->i_security;
1629         isec->sid = SECINITSID_DEVNULL;
1630         isec->sclass = SECCLASS_CHR_FILE;
1631         isec->initialized = 1;
1632
1633         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1634         d_add(dentry, inode);
1635         selinux_null = dentry;
1636
1637         dentry = d_alloc_name(sb->s_root, "avc");
1638         if (!dentry) {
1639                 ret = -ENOMEM;
1640                 goto err;
1641         }
1642
1643         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1644         if (ret)
1645                 goto err;
1646
1647         ret = sel_make_avc_files(dentry);
1648         if (ret)
1649                 goto err;
1650
1651         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1652         if (!dentry) {
1653                 ret = -ENOMEM;
1654                 goto err;
1655         }
1656
1657         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1658         if (ret)
1659                 goto err;
1660
1661         ret = sel_make_initcon_files(dentry);
1662         if (ret)
1663                 goto err;
1664
1665         dentry = d_alloc_name(sb->s_root, "class");
1666         if (!dentry) {
1667                 ret = -ENOMEM;
1668                 goto err;
1669         }
1670
1671         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1672         if (ret)
1673                 goto err;
1674
1675         class_dir = dentry;
1676
1677         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1678         if (!dentry) {
1679                 ret = -ENOMEM;
1680                 goto err;
1681         }
1682
1683         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1684         if (ret)
1685                 goto err;
1686
1687         policycap_dir = dentry;
1688
1689 out:
1690         return ret;
1691 err:
1692         printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1693                 __func__);
1694         goto out;
1695 }
1696
1697 static int sel_get_sb(struct file_system_type *fs_type,
1698                       int flags, const char *dev_name, void *data,
1699                       struct vfsmount *mnt)
1700 {
1701         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1702 }
1703
1704 static struct file_system_type sel_fs_type = {
1705         .name           = "selinuxfs",
1706         .get_sb         = sel_get_sb,
1707         .kill_sb        = kill_litter_super,
1708 };
1709
1710 struct vfsmount *selinuxfs_mount;
1711
1712 static int __init init_sel_fs(void)
1713 {
1714         int err;
1715
1716         if (!selinux_enabled)
1717                 return 0;
1718         err = register_filesystem(&sel_fs_type);
1719         if (!err) {
1720                 selinuxfs_mount = kern_mount(&sel_fs_type);
1721                 if (IS_ERR(selinuxfs_mount)) {
1722                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1723                         err = PTR_ERR(selinuxfs_mount);
1724                         selinuxfs_mount = NULL;
1725                 }
1726         }
1727         return err;
1728 }
1729
1730 __initcall(init_sel_fs);
1731
1732 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1733 void exit_sel_fs(void)
1734 {
1735         unregister_filesystem(&sel_fs_type);
1736 }
1737 #endif