selinux: dynamic class/perm discovery
[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_user(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 %x",
531                           avd.allowed, 0xffffffff,
532                           avd.auditallow, avd.auditdeny,
533                           avd.seqno, avd.flags);
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_user(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         page = (char *)get_zeroed_page(GFP_KERNEL);
807         if (!page) {
808                 ret = -ENOMEM;
809                 goto out;
810         }
811
812         cur_enforcing = security_get_bool_value(index);
813         if (cur_enforcing < 0) {
814                 ret = cur_enforcing;
815                 goto out;
816         }
817         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
818                           bool_pending_values[index]);
819         ret = simple_read_from_buffer(buf, count, ppos, page, length);
820 out:
821         mutex_unlock(&sel_mutex);
822         if (page)
823                 free_page((unsigned long)page);
824         return ret;
825 }
826
827 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
828                               size_t count, loff_t *ppos)
829 {
830         char *page = NULL;
831         ssize_t length;
832         int new_value;
833         struct inode *inode = filep->f_path.dentry->d_inode;
834         unsigned index = inode->i_ino & SEL_INO_MASK;
835         const char *name = filep->f_path.dentry->d_name.name;
836
837         mutex_lock(&sel_mutex);
838
839         length = task_has_security(current, SECURITY__SETBOOL);
840         if (length)
841                 goto out;
842
843         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
844                 length = -EINVAL;
845                 goto out;
846         }
847
848         if (count >= PAGE_SIZE) {
849                 length = -ENOMEM;
850                 goto out;
851         }
852
853         if (*ppos != 0) {
854                 /* No partial writes. */
855                 length = -EINVAL;
856                 goto out;
857         }
858         page = (char *)get_zeroed_page(GFP_KERNEL);
859         if (!page) {
860                 length = -ENOMEM;
861                 goto out;
862         }
863
864         length = -EFAULT;
865         if (copy_from_user(page, buf, count))
866                 goto out;
867
868         length = -EINVAL;
869         if (sscanf(page, "%d", &new_value) != 1)
870                 goto out;
871
872         if (new_value)
873                 new_value = 1;
874
875         bool_pending_values[index] = new_value;
876         length = count;
877
878 out:
879         mutex_unlock(&sel_mutex);
880         if (page)
881                 free_page((unsigned long) page);
882         return length;
883 }
884
885 static const struct file_operations sel_bool_ops = {
886         .read           = sel_read_bool,
887         .write          = sel_write_bool,
888 };
889
890 static ssize_t sel_commit_bools_write(struct file *filep,
891                                       const char __user *buf,
892                                       size_t count, loff_t *ppos)
893 {
894         char *page = NULL;
895         ssize_t length;
896         int new_value;
897
898         mutex_lock(&sel_mutex);
899
900         length = task_has_security(current, SECURITY__SETBOOL);
901         if (length)
902                 goto out;
903
904         if (count >= PAGE_SIZE) {
905                 length = -ENOMEM;
906                 goto out;
907         }
908         if (*ppos != 0) {
909                 /* No partial writes. */
910                 goto out;
911         }
912         page = (char *)get_zeroed_page(GFP_KERNEL);
913         if (!page) {
914                 length = -ENOMEM;
915                 goto out;
916         }
917
918         length = -EFAULT;
919         if (copy_from_user(page, buf, count))
920                 goto out;
921
922         length = -EINVAL;
923         if (sscanf(page, "%d", &new_value) != 1)
924                 goto out;
925
926         if (new_value && bool_pending_values)
927                 security_set_bools(bool_num, bool_pending_values);
928
929         length = count;
930
931 out:
932         mutex_unlock(&sel_mutex);
933         if (page)
934                 free_page((unsigned long) page);
935         return length;
936 }
937
938 static const struct file_operations sel_commit_bools_ops = {
939         .write          = sel_commit_bools_write,
940 };
941
942 static void sel_remove_entries(struct dentry *de)
943 {
944         struct list_head *node;
945
946         spin_lock(&dcache_lock);
947         node = de->d_subdirs.next;
948         while (node != &de->d_subdirs) {
949                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
950                 list_del_init(node);
951
952                 if (d->d_inode) {
953                         d = dget_locked(d);
954                         spin_unlock(&dcache_lock);
955                         d_delete(d);
956                         simple_unlink(de->d_inode, d);
957                         dput(d);
958                         spin_lock(&dcache_lock);
959                 }
960                 node = de->d_subdirs.next;
961         }
962
963         spin_unlock(&dcache_lock);
964 }
965
966 #define BOOL_DIR_NAME "booleans"
967
968 static int sel_make_bools(void)
969 {
970         int i, ret = 0;
971         ssize_t len;
972         struct dentry *dentry = NULL;
973         struct dentry *dir = bool_dir;
974         struct inode *inode = NULL;
975         struct inode_security_struct *isec;
976         char **names = NULL, *page;
977         int num;
978         int *values = NULL;
979         u32 sid;
980
981         /* remove any existing files */
982         kfree(bool_pending_names);
983         kfree(bool_pending_values);
984         bool_pending_names = NULL;
985         bool_pending_values = NULL;
986
987         sel_remove_entries(dir);
988
989         page = (char *)get_zeroed_page(GFP_KERNEL);
990         if (!page)
991                 return -ENOMEM;
992
993         ret = security_get_bools(&num, &names, &values);
994         if (ret != 0)
995                 goto out;
996
997         for (i = 0; i < num; i++) {
998                 dentry = d_alloc_name(dir, names[i]);
999                 if (!dentry) {
1000                         ret = -ENOMEM;
1001                         goto err;
1002                 }
1003                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1004                 if (!inode) {
1005                         ret = -ENOMEM;
1006                         goto err;
1007                 }
1008
1009                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1010                 if (len < 0) {
1011                         ret = -EINVAL;
1012                         goto err;
1013                 } else if (len >= PAGE_SIZE) {
1014                         ret = -ENAMETOOLONG;
1015                         goto err;
1016                 }
1017                 isec = (struct inode_security_struct *)inode->i_security;
1018                 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1019                 if (ret)
1020                         goto err;
1021                 isec->sid = sid;
1022                 isec->initialized = 1;
1023                 inode->i_fop = &sel_bool_ops;
1024                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1025                 d_add(dentry, inode);
1026         }
1027         bool_num = num;
1028         bool_pending_names = names;
1029         bool_pending_values = values;
1030 out:
1031         free_page((unsigned long)page);
1032         return ret;
1033 err:
1034         if (names) {
1035                 for (i = 0; i < num; i++)
1036                         kfree(names[i]);
1037                 kfree(names);
1038         }
1039         kfree(values);
1040         sel_remove_entries(dir);
1041         ret = -ENOMEM;
1042         goto out;
1043 }
1044
1045 #define NULL_FILE_NAME "null"
1046
1047 struct dentry *selinux_null;
1048
1049 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1050                                             size_t count, loff_t *ppos)
1051 {
1052         char tmpbuf[TMPBUFLEN];
1053         ssize_t length;
1054
1055         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1056         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1057 }
1058
1059 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1060                                              const char __user *buf,
1061                                              size_t count, loff_t *ppos)
1062
1063 {
1064         char *page;
1065         ssize_t ret;
1066         int new_value;
1067
1068         if (count >= PAGE_SIZE) {
1069                 ret = -ENOMEM;
1070                 goto out;
1071         }
1072
1073         if (*ppos != 0) {
1074                 /* No partial writes. */
1075                 ret = -EINVAL;
1076                 goto out;
1077         }
1078
1079         page = (char *)get_zeroed_page(GFP_KERNEL);
1080         if (!page) {
1081                 ret = -ENOMEM;
1082                 goto out;
1083         }
1084
1085         if (copy_from_user(page, buf, count)) {
1086                 ret = -EFAULT;
1087                 goto out_free;
1088         }
1089
1090         if (sscanf(page, "%u", &new_value) != 1) {
1091                 ret = -EINVAL;
1092                 goto out;
1093         }
1094
1095         if (new_value != avc_cache_threshold) {
1096                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1097                 if (ret)
1098                         goto out_free;
1099                 avc_cache_threshold = new_value;
1100         }
1101         ret = count;
1102 out_free:
1103         free_page((unsigned long)page);
1104 out:
1105         return ret;
1106 }
1107
1108 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1109                                        size_t count, loff_t *ppos)
1110 {
1111         char *page;
1112         ssize_t ret = 0;
1113
1114         page = (char *)__get_free_page(GFP_KERNEL);
1115         if (!page) {
1116                 ret = -ENOMEM;
1117                 goto out;
1118         }
1119         ret = avc_get_hash_stats(page);
1120         if (ret >= 0)
1121                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1122         free_page((unsigned long)page);
1123 out:
1124         return ret;
1125 }
1126
1127 static const struct file_operations sel_avc_cache_threshold_ops = {
1128         .read           = sel_read_avc_cache_threshold,
1129         .write          = sel_write_avc_cache_threshold,
1130 };
1131
1132 static const struct file_operations sel_avc_hash_stats_ops = {
1133         .read           = sel_read_avc_hash_stats,
1134 };
1135
1136 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1137 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1138 {
1139         int cpu;
1140
1141         for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1142                 if (!cpu_possible(cpu))
1143                         continue;
1144                 *idx = cpu + 1;
1145                 return &per_cpu(avc_cache_stats, cpu);
1146         }
1147         return NULL;
1148 }
1149
1150 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1151 {
1152         loff_t n = *pos - 1;
1153
1154         if (*pos == 0)
1155                 return SEQ_START_TOKEN;
1156
1157         return sel_avc_get_stat_idx(&n);
1158 }
1159
1160 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1161 {
1162         return sel_avc_get_stat_idx(pos);
1163 }
1164
1165 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1166 {
1167         struct avc_cache_stats *st = v;
1168
1169         if (v == SEQ_START_TOKEN)
1170                 seq_printf(seq, "lookups hits misses allocations reclaims "
1171                            "frees\n");
1172         else
1173                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1174                            st->hits, st->misses, st->allocations,
1175                            st->reclaims, st->frees);
1176         return 0;
1177 }
1178
1179 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1180 { }
1181
1182 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1183         .start          = sel_avc_stats_seq_start,
1184         .next           = sel_avc_stats_seq_next,
1185         .show           = sel_avc_stats_seq_show,
1186         .stop           = sel_avc_stats_seq_stop,
1187 };
1188
1189 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1190 {
1191         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1192 }
1193
1194 static const struct file_operations sel_avc_cache_stats_ops = {
1195         .open           = sel_open_avc_cache_stats,
1196         .read           = seq_read,
1197         .llseek         = seq_lseek,
1198         .release        = seq_release,
1199 };
1200 #endif
1201
1202 static int sel_make_avc_files(struct dentry *dir)
1203 {
1204         int i, ret = 0;
1205         static struct tree_descr files[] = {
1206                 { "cache_threshold",
1207                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1208                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1209 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1210                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1211 #endif
1212         };
1213
1214         for (i = 0; i < ARRAY_SIZE(files); i++) {
1215                 struct inode *inode;
1216                 struct dentry *dentry;
1217
1218                 dentry = d_alloc_name(dir, files[i].name);
1219                 if (!dentry) {
1220                         ret = -ENOMEM;
1221                         goto out;
1222                 }
1223
1224                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1225                 if (!inode) {
1226                         ret = -ENOMEM;
1227                         goto out;
1228                 }
1229                 inode->i_fop = files[i].ops;
1230                 inode->i_ino = ++sel_last_ino;
1231                 d_add(dentry, inode);
1232         }
1233 out:
1234         return ret;
1235 }
1236
1237 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1238                                 size_t count, loff_t *ppos)
1239 {
1240         struct inode *inode;
1241         char *con;
1242         u32 sid, len;
1243         ssize_t ret;
1244
1245         inode = file->f_path.dentry->d_inode;
1246         sid = inode->i_ino&SEL_INO_MASK;
1247         ret = security_sid_to_context(sid, &con, &len);
1248         if (ret < 0)
1249                 return ret;
1250
1251         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1252         kfree(con);
1253         return ret;
1254 }
1255
1256 static const struct file_operations sel_initcon_ops = {
1257         .read           = sel_read_initcon,
1258 };
1259
1260 static int sel_make_initcon_files(struct dentry *dir)
1261 {
1262         int i, ret = 0;
1263
1264         for (i = 1; i <= SECINITSID_NUM; i++) {
1265                 struct inode *inode;
1266                 struct dentry *dentry;
1267                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1268                 if (!dentry) {
1269                         ret = -ENOMEM;
1270                         goto out;
1271                 }
1272
1273                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1274                 if (!inode) {
1275                         ret = -ENOMEM;
1276                         goto out;
1277                 }
1278                 inode->i_fop = &sel_initcon_ops;
1279                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1280                 d_add(dentry, inode);
1281         }
1282 out:
1283         return ret;
1284 }
1285
1286 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1287 {
1288         return a / b - (a % b < 0);
1289 }
1290
1291 static inline unsigned long sel_class_to_ino(u16 class)
1292 {
1293         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1294 }
1295
1296 static inline u16 sel_ino_to_class(unsigned long ino)
1297 {
1298         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1299 }
1300
1301 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1302 {
1303         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1304 }
1305
1306 static inline u32 sel_ino_to_perm(unsigned long ino)
1307 {
1308         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1309 }
1310
1311 static ssize_t sel_read_class(struct file *file, char __user *buf,
1312                                 size_t count, loff_t *ppos)
1313 {
1314         ssize_t rc, len;
1315         char *page;
1316         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1317
1318         page = (char *)__get_free_page(GFP_KERNEL);
1319         if (!page) {
1320                 rc = -ENOMEM;
1321                 goto out;
1322         }
1323
1324         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1325         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1326         free_page((unsigned long)page);
1327 out:
1328         return rc;
1329 }
1330
1331 static const struct file_operations sel_class_ops = {
1332         .read           = sel_read_class,
1333 };
1334
1335 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1336                                 size_t count, loff_t *ppos)
1337 {
1338         ssize_t rc, len;
1339         char *page;
1340         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1341
1342         page = (char *)__get_free_page(GFP_KERNEL);
1343         if (!page) {
1344                 rc = -ENOMEM;
1345                 goto out;
1346         }
1347
1348         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1349         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1350         free_page((unsigned long)page);
1351 out:
1352         return rc;
1353 }
1354
1355 static const struct file_operations sel_perm_ops = {
1356         .read           = sel_read_perm,
1357 };
1358
1359 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1360                                   size_t count, loff_t *ppos)
1361 {
1362         int value;
1363         char tmpbuf[TMPBUFLEN];
1364         ssize_t length;
1365         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1366
1367         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1368         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1369
1370         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1371 }
1372
1373 static const struct file_operations sel_policycap_ops = {
1374         .read           = sel_read_policycap,
1375 };
1376
1377 static int sel_make_perm_files(char *objclass, int classvalue,
1378                                 struct dentry *dir)
1379 {
1380         int i, rc = 0, nperms;
1381         char **perms;
1382
1383         rc = security_get_permissions(objclass, &perms, &nperms);
1384         if (rc)
1385                 goto out;
1386
1387         for (i = 0; i < nperms; i++) {
1388                 struct inode *inode;
1389                 struct dentry *dentry;
1390
1391                 dentry = d_alloc_name(dir, perms[i]);
1392                 if (!dentry) {
1393                         rc = -ENOMEM;
1394                         goto out1;
1395                 }
1396
1397                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1398                 if (!inode) {
1399                         rc = -ENOMEM;
1400                         goto out1;
1401                 }
1402                 inode->i_fop = &sel_perm_ops;
1403                 /* i+1 since perm values are 1-indexed */
1404                 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1405                 d_add(dentry, inode);
1406         }
1407
1408 out1:
1409         for (i = 0; i < nperms; i++)
1410                 kfree(perms[i]);
1411         kfree(perms);
1412 out:
1413         return rc;
1414 }
1415
1416 static int sel_make_class_dir_entries(char *classname, int index,
1417                                         struct dentry *dir)
1418 {
1419         struct dentry *dentry = NULL;
1420         struct inode *inode = NULL;
1421         int rc;
1422
1423         dentry = d_alloc_name(dir, "index");
1424         if (!dentry) {
1425                 rc = -ENOMEM;
1426                 goto out;
1427         }
1428
1429         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1430         if (!inode) {
1431                 rc = -ENOMEM;
1432                 goto out;
1433         }
1434
1435         inode->i_fop = &sel_class_ops;
1436         inode->i_ino = sel_class_to_ino(index);
1437         d_add(dentry, inode);
1438
1439         dentry = d_alloc_name(dir, "perms");
1440         if (!dentry) {
1441                 rc = -ENOMEM;
1442                 goto out;
1443         }
1444
1445         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1446         if (rc)
1447                 goto out;
1448
1449         rc = sel_make_perm_files(classname, index, dentry);
1450
1451 out:
1452         return rc;
1453 }
1454
1455 static void sel_remove_classes(void)
1456 {
1457         struct list_head *class_node;
1458
1459         list_for_each(class_node, &class_dir->d_subdirs) {
1460                 struct dentry *class_subdir = list_entry(class_node,
1461                                         struct dentry, d_u.d_child);
1462                 struct list_head *class_subdir_node;
1463
1464                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1465                         struct dentry *d = list_entry(class_subdir_node,
1466                                                 struct dentry, d_u.d_child);
1467
1468                         if (d->d_inode)
1469                                 if (d->d_inode->i_mode & S_IFDIR)
1470                                         sel_remove_entries(d);
1471                 }
1472
1473                 sel_remove_entries(class_subdir);
1474         }
1475
1476         sel_remove_entries(class_dir);
1477 }
1478
1479 static int sel_make_classes(void)
1480 {
1481         int rc = 0, nclasses, i;
1482         char **classes;
1483
1484         /* delete any existing entries */
1485         sel_remove_classes();
1486
1487         rc = security_get_classes(&classes, &nclasses);
1488         if (rc < 0)
1489                 goto out;
1490
1491         /* +2 since classes are 1-indexed */
1492         last_class_ino = sel_class_to_ino(nclasses+2);
1493
1494         for (i = 0; i < nclasses; i++) {
1495                 struct dentry *class_name_dir;
1496
1497                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1498                 if (!class_name_dir) {
1499                         rc = -ENOMEM;
1500                         goto out1;
1501                 }
1502
1503                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1504                                 &last_class_ino);
1505                 if (rc)
1506                         goto out1;
1507
1508                 /* i+1 since class values are 1-indexed */
1509                 rc = sel_make_class_dir_entries(classes[i], i+1,
1510                                 class_name_dir);
1511                 if (rc)
1512                         goto out1;
1513         }
1514
1515 out1:
1516         for (i = 0; i < nclasses; i++)
1517                 kfree(classes[i]);
1518         kfree(classes);
1519 out:
1520         return rc;
1521 }
1522
1523 static int sel_make_policycap(void)
1524 {
1525         unsigned int iter;
1526         struct dentry *dentry = NULL;
1527         struct inode *inode = NULL;
1528
1529         sel_remove_entries(policycap_dir);
1530
1531         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1532                 if (iter < ARRAY_SIZE(policycap_names))
1533                         dentry = d_alloc_name(policycap_dir,
1534                                               policycap_names[iter]);
1535                 else
1536                         dentry = d_alloc_name(policycap_dir, "unknown");
1537
1538                 if (dentry == NULL)
1539                         return -ENOMEM;
1540
1541                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1542                 if (inode == NULL)
1543                         return -ENOMEM;
1544
1545                 inode->i_fop = &sel_policycap_ops;
1546                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1547                 d_add(dentry, inode);
1548         }
1549
1550         return 0;
1551 }
1552
1553 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1554                         unsigned long *ino)
1555 {
1556         int ret = 0;
1557         struct inode *inode;
1558
1559         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1560         if (!inode) {
1561                 ret = -ENOMEM;
1562                 goto out;
1563         }
1564         inode->i_op = &simple_dir_inode_operations;
1565         inode->i_fop = &simple_dir_operations;
1566         inode->i_ino = ++(*ino);
1567         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1568         inc_nlink(inode);
1569         d_add(dentry, inode);
1570         /* bump link count on parent directory, too */
1571         inc_nlink(dir);
1572 out:
1573         return ret;
1574 }
1575
1576 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1577 {
1578         int ret;
1579         struct dentry *dentry;
1580         struct inode *inode, *root_inode;
1581         struct inode_security_struct *isec;
1582
1583         static struct tree_descr selinux_files[] = {
1584                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1585                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1586                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1587                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1588                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1589                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1590                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1591                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1592                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1593                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1594                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1595                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1596                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1597                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1598                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1599                 /* last one */ {""}
1600         };
1601         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1602         if (ret)
1603                 goto err;
1604
1605         root_inode = sb->s_root->d_inode;
1606
1607         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1608         if (!dentry) {
1609                 ret = -ENOMEM;
1610                 goto err;
1611         }
1612
1613         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1614         if (ret)
1615                 goto err;
1616
1617         bool_dir = dentry;
1618
1619         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1620         if (!dentry) {
1621                 ret = -ENOMEM;
1622                 goto err;
1623         }
1624
1625         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1626         if (!inode) {
1627                 ret = -ENOMEM;
1628                 goto err;
1629         }
1630         inode->i_ino = ++sel_last_ino;
1631         isec = (struct inode_security_struct *)inode->i_security;
1632         isec->sid = SECINITSID_DEVNULL;
1633         isec->sclass = SECCLASS_CHR_FILE;
1634         isec->initialized = 1;
1635
1636         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1637         d_add(dentry, inode);
1638         selinux_null = dentry;
1639
1640         dentry = d_alloc_name(sb->s_root, "avc");
1641         if (!dentry) {
1642                 ret = -ENOMEM;
1643                 goto err;
1644         }
1645
1646         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1647         if (ret)
1648                 goto err;
1649
1650         ret = sel_make_avc_files(dentry);
1651         if (ret)
1652                 goto err;
1653
1654         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1655         if (!dentry) {
1656                 ret = -ENOMEM;
1657                 goto err;
1658         }
1659
1660         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1661         if (ret)
1662                 goto err;
1663
1664         ret = sel_make_initcon_files(dentry);
1665         if (ret)
1666                 goto err;
1667
1668         dentry = d_alloc_name(sb->s_root, "class");
1669         if (!dentry) {
1670                 ret = -ENOMEM;
1671                 goto err;
1672         }
1673
1674         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1675         if (ret)
1676                 goto err;
1677
1678         class_dir = dentry;
1679
1680         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1681         if (!dentry) {
1682                 ret = -ENOMEM;
1683                 goto err;
1684         }
1685
1686         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1687         if (ret)
1688                 goto err;
1689
1690         policycap_dir = dentry;
1691
1692 out:
1693         return ret;
1694 err:
1695         printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1696                 __func__);
1697         goto out;
1698 }
1699
1700 static int sel_get_sb(struct file_system_type *fs_type,
1701                       int flags, const char *dev_name, void *data,
1702                       struct vfsmount *mnt)
1703 {
1704         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1705 }
1706
1707 static struct file_system_type sel_fs_type = {
1708         .name           = "selinuxfs",
1709         .get_sb         = sel_get_sb,
1710         .kill_sb        = kill_litter_super,
1711 };
1712
1713 struct vfsmount *selinuxfs_mount;
1714
1715 static int __init init_sel_fs(void)
1716 {
1717         int err;
1718
1719         if (!selinux_enabled)
1720                 return 0;
1721         err = register_filesystem(&sel_fs_type);
1722         if (!err) {
1723                 selinuxfs_mount = kern_mount(&sel_fs_type);
1724                 if (IS_ERR(selinuxfs_mount)) {
1725                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1726                         err = PTR_ERR(selinuxfs_mount);
1727                         selinuxfs_mount = NULL;
1728                 }
1729         }
1730         return err;
1731 }
1732
1733 __initcall(init_sel_fs);
1734
1735 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1736 void exit_sel_fs(void)
1737 {
1738         unregister_filesystem(&sel_fs_type);
1739 }
1740 #endif