selinux: Deprecate and schedule the removal of the the compat_net functionality
[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 int selinux_compat_net = 0;
51
52 static int __init checkreqprot_setup(char *str)
53 {
54         unsigned long checkreqprot;
55         if (!strict_strtoul(str, 0, &checkreqprot))
56                 selinux_checkreqprot = checkreqprot ? 1 : 0;
57         return 1;
58 }
59 __setup("checkreqprot=", checkreqprot_setup);
60
61 static int __init selinux_compat_net_setup(char *str)
62 {
63         unsigned long compat_net;
64         if (!strict_strtoul(str, 0, &compat_net))
65                 selinux_compat_net = compat_net ? 1 : 0;
66         return 1;
67 }
68 __setup("selinux_compat_net=", selinux_compat_net_setup);
69
70
71 static DEFINE_MUTEX(sel_mutex);
72
73 /* global data for booleans */
74 static struct dentry *bool_dir;
75 static int bool_num;
76 static char **bool_pending_names;
77 static int *bool_pending_values;
78
79 /* global data for classes */
80 static struct dentry *class_dir;
81 static unsigned long last_class_ino;
82
83 /* global data for policy capabilities */
84 static struct dentry *policycap_dir;
85
86 extern void selnl_notify_setenforce(int val);
87
88 /* Check whether a task is allowed to use a security operation. */
89 static int task_has_security(struct task_struct *tsk,
90                              u32 perms)
91 {
92         const struct task_security_struct *tsec;
93         u32 sid = 0;
94
95         rcu_read_lock();
96         tsec = __task_cred(tsk)->security;
97         if (tsec)
98                 sid = tsec->sid;
99         rcu_read_unlock();
100         if (!tsec)
101                 return -EACCES;
102
103         return avc_has_perm(sid, SECINITSID_SECURITY,
104                             SECCLASS_SECURITY, perms, NULL);
105 }
106
107 enum sel_inos {
108         SEL_ROOT_INO = 2,
109         SEL_LOAD,       /* load policy */
110         SEL_ENFORCE,    /* get or set enforcing status */
111         SEL_CONTEXT,    /* validate context */
112         SEL_ACCESS,     /* compute access decision */
113         SEL_CREATE,     /* compute create labeling decision */
114         SEL_RELABEL,    /* compute relabeling decision */
115         SEL_USER,       /* compute reachable user contexts */
116         SEL_POLICYVERS, /* return policy version for this kernel */
117         SEL_COMMIT_BOOLS, /* commit new boolean values */
118         SEL_MLS,        /* return if MLS policy is enabled */
119         SEL_DISABLE,    /* disable SELinux until next reboot */
120         SEL_MEMBER,     /* compute polyinstantiation membership decision */
121         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
122         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
123         SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
124         SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
125         SEL_INO_NEXT,   /* The next inode number to use */
126 };
127
128 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
129
130 #define SEL_INITCON_INO_OFFSET          0x01000000
131 #define SEL_BOOL_INO_OFFSET             0x02000000
132 #define SEL_CLASS_INO_OFFSET            0x04000000
133 #define SEL_POLICYCAP_INO_OFFSET        0x08000000
134 #define SEL_INO_MASK                    0x00ffffff
135
136 #define TMPBUFLEN       12
137 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
138                                 size_t count, loff_t *ppos)
139 {
140         char tmpbuf[TMPBUFLEN];
141         ssize_t length;
142
143         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
144         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
145 }
146
147 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
148 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
149                                  size_t count, loff_t *ppos)
150
151 {
152         char *page;
153         ssize_t length;
154         int new_value;
155
156         if (count >= PAGE_SIZE)
157                 return -ENOMEM;
158         if (*ppos != 0) {
159                 /* No partial writes. */
160                 return -EINVAL;
161         }
162         page = (char *)get_zeroed_page(GFP_KERNEL);
163         if (!page)
164                 return -ENOMEM;
165         length = -EFAULT;
166         if (copy_from_user(page, buf, count))
167                 goto out;
168
169         length = -EINVAL;
170         if (sscanf(page, "%d", &new_value) != 1)
171                 goto out;
172
173         if (new_value != selinux_enforcing) {
174                 length = task_has_security(current, SECURITY__SETENFORCE);
175                 if (length)
176                         goto out;
177                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
178                         "enforcing=%d old_enforcing=%d auid=%u ses=%u",
179                         new_value, selinux_enforcing,
180                         audit_get_loginuid(current),
181                         audit_get_sessionid(current));
182                 selinux_enforcing = new_value;
183                 if (selinux_enforcing)
184                         avc_ss_reset(0);
185                 selnl_notify_setenforce(selinux_enforcing);
186         }
187         length = count;
188 out:
189         free_page((unsigned long) page);
190         return length;
191 }
192 #else
193 #define sel_write_enforce NULL
194 #endif
195
196 static const struct file_operations sel_enforce_ops = {
197         .read           = sel_read_enforce,
198         .write          = sel_write_enforce,
199 };
200
201 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
202                                         size_t count, loff_t *ppos)
203 {
204         char tmpbuf[TMPBUFLEN];
205         ssize_t length;
206         ino_t ino = filp->f_path.dentry->d_inode->i_ino;
207         int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
208                 security_get_reject_unknown() : !security_get_allow_unknown();
209
210         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
212 }
213
214 static const struct file_operations sel_handle_unknown_ops = {
215         .read           = sel_read_handle_unknown,
216 };
217
218 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
219 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
220                                  size_t count, loff_t *ppos)
221
222 {
223         char *page;
224         ssize_t length;
225         int new_value;
226         extern int selinux_disable(void);
227
228         if (count >= PAGE_SIZE)
229                 return -ENOMEM;
230         if (*ppos != 0) {
231                 /* No partial writes. */
232                 return -EINVAL;
233         }
234         page = (char *)get_zeroed_page(GFP_KERNEL);
235         if (!page)
236                 return -ENOMEM;
237         length = -EFAULT;
238         if (copy_from_user(page, buf, count))
239                 goto out;
240
241         length = -EINVAL;
242         if (sscanf(page, "%d", &new_value) != 1)
243                 goto out;
244
245         if (new_value) {
246                 length = selinux_disable();
247                 if (length < 0)
248                         goto out;
249                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
250                         "selinux=0 auid=%u ses=%u",
251                         audit_get_loginuid(current),
252                         audit_get_sessionid(current));
253         }
254
255         length = count;
256 out:
257         free_page((unsigned long) page);
258         return length;
259 }
260 #else
261 #define sel_write_disable NULL
262 #endif
263
264 static const struct file_operations sel_disable_ops = {
265         .write          = sel_write_disable,
266 };
267
268 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
269                                    size_t count, loff_t *ppos)
270 {
271         char tmpbuf[TMPBUFLEN];
272         ssize_t length;
273
274         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
275         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
276 }
277
278 static const struct file_operations sel_policyvers_ops = {
279         .read           = sel_read_policyvers,
280 };
281
282 /* declaration for sel_write_load */
283 static int sel_make_bools(void);
284 static int sel_make_classes(void);
285 static int sel_make_policycap(void);
286
287 /* declaration for sel_make_class_dirs */
288 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
289                         unsigned long *ino);
290
291 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
292                                 size_t count, loff_t *ppos)
293 {
294         char tmpbuf[TMPBUFLEN];
295         ssize_t length;
296
297         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
298         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
299 }
300
301 static const struct file_operations sel_mls_ops = {
302         .read           = sel_read_mls,
303 };
304
305 static ssize_t sel_write_load(struct file *file, const char __user *buf,
306                               size_t count, loff_t *ppos)
307
308 {
309         int ret;
310         ssize_t length;
311         void *data = NULL;
312
313         mutex_lock(&sel_mutex);
314
315         length = task_has_security(current, SECURITY__LOAD_POLICY);
316         if (length)
317                 goto out;
318
319         if (*ppos != 0) {
320                 /* No partial writes. */
321                 length = -EINVAL;
322                 goto out;
323         }
324
325         if ((count > 64 * 1024 * 1024)
326             || (data = vmalloc(count)) == NULL) {
327                 length = -ENOMEM;
328                 goto out;
329         }
330
331         length = -EFAULT;
332         if (copy_from_user(data, buf, count) != 0)
333                 goto out;
334
335         length = security_load_policy(data, count);
336         if (length)
337                 goto out;
338
339         ret = sel_make_bools();
340         if (ret) {
341                 length = ret;
342                 goto out1;
343         }
344
345         ret = sel_make_classes();
346         if (ret) {
347                 length = ret;
348                 goto out1;
349         }
350
351         ret = sel_make_policycap();
352         if (ret)
353                 length = ret;
354         else
355                 length = count;
356
357 out1:
358         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
359                 "policy loaded auid=%u ses=%u",
360                 audit_get_loginuid(current),
361                 audit_get_sessionid(current));
362 out:
363         mutex_unlock(&sel_mutex);
364         vfree(data);
365         return length;
366 }
367
368 static const struct file_operations sel_load_ops = {
369         .write          = sel_write_load,
370 };
371
372 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
373 {
374         char *canon;
375         u32 sid, len;
376         ssize_t length;
377
378         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
379         if (length)
380                 return length;
381
382         length = security_context_to_sid(buf, size, &sid);
383         if (length < 0)
384                 return length;
385
386         length = security_sid_to_context(sid, &canon, &len);
387         if (length < 0)
388                 return length;
389
390         if (len > SIMPLE_TRANSACTION_LIMIT) {
391                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
392                         "payload max\n", __func__, len);
393                 length = -ERANGE;
394                 goto out;
395         }
396
397         memcpy(buf, canon, len);
398         length = len;
399 out:
400         kfree(canon);
401         return length;
402 }
403
404 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
405                                      size_t count, loff_t *ppos)
406 {
407         char tmpbuf[TMPBUFLEN];
408         ssize_t length;
409
410         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
411         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
412 }
413
414 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
415                                       size_t count, loff_t *ppos)
416 {
417         char *page;
418         ssize_t length;
419         unsigned int new_value;
420
421         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
422         if (length)
423                 return length;
424
425         if (count >= PAGE_SIZE)
426                 return -ENOMEM;
427         if (*ppos != 0) {
428                 /* No partial writes. */
429                 return -EINVAL;
430         }
431         page = (char *)get_zeroed_page(GFP_KERNEL);
432         if (!page)
433                 return -ENOMEM;
434         length = -EFAULT;
435         if (copy_from_user(page, buf, count))
436                 goto out;
437
438         length = -EINVAL;
439         if (sscanf(page, "%u", &new_value) != 1)
440                 goto out;
441
442         selinux_checkreqprot = new_value ? 1 : 0;
443         length = count;
444 out:
445         free_page((unsigned long) page);
446         return length;
447 }
448 static const struct file_operations sel_checkreqprot_ops = {
449         .read           = sel_read_checkreqprot,
450         .write          = sel_write_checkreqprot,
451 };
452
453 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
454                                    size_t count, loff_t *ppos)
455 {
456         char tmpbuf[TMPBUFLEN];
457         ssize_t length;
458
459         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
460         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
461 }
462
463 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
464                                     size_t count, loff_t *ppos)
465 {
466         char *page;
467         ssize_t length;
468         int new_value;
469
470         length = task_has_security(current, SECURITY__LOAD_POLICY);
471         if (length)
472                 return length;
473
474         if (count >= PAGE_SIZE)
475                 return -ENOMEM;
476         if (*ppos != 0) {
477                 /* No partial writes. */
478                 return -EINVAL;
479         }
480         page = (char *)get_zeroed_page(GFP_KERNEL);
481         if (!page)
482                 return -ENOMEM;
483         length = -EFAULT;
484         if (copy_from_user(page, buf, count))
485                 goto out;
486
487         length = -EINVAL;
488         if (sscanf(page, "%d", &new_value) != 1)
489                 goto out;
490
491         if (new_value) {
492                 printk(KERN_NOTICE
493                        "SELinux: compat_net is deprecated, please use secmark"
494                        " instead\n");
495                 selinux_compat_net = 1;
496         } else
497                 selinux_compat_net = 0;
498         length = count;
499 out:
500         free_page((unsigned long) page);
501         return length;
502 }
503 static const struct file_operations sel_compat_net_ops = {
504         .read           = sel_read_compat_net,
505         .write          = sel_write_compat_net,
506 };
507
508 /*
509  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
510  */
511 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
512 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
513 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
514 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
515 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
516
517 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
518         [SEL_ACCESS] = sel_write_access,
519         [SEL_CREATE] = sel_write_create,
520         [SEL_RELABEL] = sel_write_relabel,
521         [SEL_USER] = sel_write_user,
522         [SEL_MEMBER] = sel_write_member,
523         [SEL_CONTEXT] = sel_write_context,
524 };
525
526 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
527 {
528         ino_t ino = file->f_path.dentry->d_inode->i_ino;
529         char *data;
530         ssize_t rv;
531
532         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
533                 return -EINVAL;
534
535         data = simple_transaction_get(file, buf, size);
536         if (IS_ERR(data))
537                 return PTR_ERR(data);
538
539         rv = write_op[ino](file, data, size);
540         if (rv > 0) {
541                 simple_transaction_set(file, rv);
542                 rv = size;
543         }
544         return rv;
545 }
546
547 static const struct file_operations transaction_ops = {
548         .write          = selinux_transaction_write,
549         .read           = simple_transaction_read,
550         .release        = simple_transaction_release,
551 };
552
553 /*
554  * payload - write methods
555  * If the method has a response, the response should be put in buf,
556  * and the length returned.  Otherwise return 0 or and -error.
557  */
558
559 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
560 {
561         char *scon, *tcon;
562         u32 ssid, tsid;
563         u16 tclass;
564         u32 req;
565         struct av_decision avd;
566         ssize_t length;
567
568         length = task_has_security(current, SECURITY__COMPUTE_AV);
569         if (length)
570                 return length;
571
572         length = -ENOMEM;
573         scon = kzalloc(size+1, GFP_KERNEL);
574         if (!scon)
575                 return length;
576
577         tcon = kzalloc(size+1, GFP_KERNEL);
578         if (!tcon)
579                 goto out;
580
581         length = -EINVAL;
582         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
583                 goto out2;
584
585         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
586         if (length < 0)
587                 goto out2;
588         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
589         if (length < 0)
590                 goto out2;
591
592         length = security_compute_av(ssid, tsid, tclass, req, &avd);
593         if (length < 0)
594                 goto out2;
595
596         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
597                           "%x %x %x %x %u",
598                           avd.allowed, avd.decided,
599                           avd.auditallow, avd.auditdeny,
600                           avd.seqno);
601 out2:
602         kfree(tcon);
603 out:
604         kfree(scon);
605         return length;
606 }
607
608 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
609 {
610         char *scon, *tcon;
611         u32 ssid, tsid, newsid;
612         u16 tclass;
613         ssize_t length;
614         char *newcon;
615         u32 len;
616
617         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
618         if (length)
619                 return length;
620
621         length = -ENOMEM;
622         scon = kzalloc(size+1, GFP_KERNEL);
623         if (!scon)
624                 return length;
625
626         tcon = kzalloc(size+1, GFP_KERNEL);
627         if (!tcon)
628                 goto out;
629
630         length = -EINVAL;
631         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
632                 goto out2;
633
634         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
635         if (length < 0)
636                 goto out2;
637         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
638         if (length < 0)
639                 goto out2;
640
641         length = security_transition_sid(ssid, tsid, tclass, &newsid);
642         if (length < 0)
643                 goto out2;
644
645         length = security_sid_to_context(newsid, &newcon, &len);
646         if (length < 0)
647                 goto out2;
648
649         if (len > SIMPLE_TRANSACTION_LIMIT) {
650                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
651                         "payload max\n", __func__, len);
652                 length = -ERANGE;
653                 goto out3;
654         }
655
656         memcpy(buf, newcon, len);
657         length = len;
658 out3:
659         kfree(newcon);
660 out2:
661         kfree(tcon);
662 out:
663         kfree(scon);
664         return length;
665 }
666
667 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
668 {
669         char *scon, *tcon;
670         u32 ssid, tsid, newsid;
671         u16 tclass;
672         ssize_t length;
673         char *newcon;
674         u32 len;
675
676         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
677         if (length)
678                 return length;
679
680         length = -ENOMEM;
681         scon = kzalloc(size+1, GFP_KERNEL);
682         if (!scon)
683                 return length;
684
685         tcon = kzalloc(size+1, GFP_KERNEL);
686         if (!tcon)
687                 goto out;
688
689         length = -EINVAL;
690         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
691                 goto out2;
692
693         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
694         if (length < 0)
695                 goto out2;
696         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
697         if (length < 0)
698                 goto out2;
699
700         length = security_change_sid(ssid, tsid, tclass, &newsid);
701         if (length < 0)
702                 goto out2;
703
704         length = security_sid_to_context(newsid, &newcon, &len);
705         if (length < 0)
706                 goto out2;
707
708         if (len > SIMPLE_TRANSACTION_LIMIT) {
709                 length = -ERANGE;
710                 goto out3;
711         }
712
713         memcpy(buf, newcon, len);
714         length = len;
715 out3:
716         kfree(newcon);
717 out2:
718         kfree(tcon);
719 out:
720         kfree(scon);
721         return length;
722 }
723
724 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
725 {
726         char *con, *user, *ptr;
727         u32 sid, *sids;
728         ssize_t length;
729         char *newcon;
730         int i, rc;
731         u32 len, nsids;
732
733         length = task_has_security(current, SECURITY__COMPUTE_USER);
734         if (length)
735                 return length;
736
737         length = -ENOMEM;
738         con = kzalloc(size+1, GFP_KERNEL);
739         if (!con)
740                 return length;
741
742         user = kzalloc(size+1, GFP_KERNEL);
743         if (!user)
744                 goto out;
745
746         length = -EINVAL;
747         if (sscanf(buf, "%s %s", con, user) != 2)
748                 goto out2;
749
750         length = security_context_to_sid(con, strlen(con)+1, &sid);
751         if (length < 0)
752                 goto out2;
753
754         length = security_get_user_sids(sid, user, &sids, &nsids);
755         if (length < 0)
756                 goto out2;
757
758         length = sprintf(buf, "%u", nsids) + 1;
759         ptr = buf + length;
760         for (i = 0; i < nsids; i++) {
761                 rc = security_sid_to_context(sids[i], &newcon, &len);
762                 if (rc) {
763                         length = rc;
764                         goto out3;
765                 }
766                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
767                         kfree(newcon);
768                         length = -ERANGE;
769                         goto out3;
770                 }
771                 memcpy(ptr, newcon, len);
772                 kfree(newcon);
773                 ptr += len;
774                 length += len;
775         }
776 out3:
777         kfree(sids);
778 out2:
779         kfree(user);
780 out:
781         kfree(con);
782         return length;
783 }
784
785 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
786 {
787         char *scon, *tcon;
788         u32 ssid, tsid, newsid;
789         u16 tclass;
790         ssize_t length;
791         char *newcon;
792         u32 len;
793
794         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
795         if (length)
796                 return length;
797
798         length = -ENOMEM;
799         scon = kzalloc(size+1, GFP_KERNEL);
800         if (!scon)
801                 return length;
802
803         tcon = kzalloc(size+1, GFP_KERNEL);
804         if (!tcon)
805                 goto out;
806
807         length = -EINVAL;
808         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
809                 goto out2;
810
811         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
812         if (length < 0)
813                 goto out2;
814         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
815         if (length < 0)
816                 goto out2;
817
818         length = security_member_sid(ssid, tsid, tclass, &newsid);
819         if (length < 0)
820                 goto out2;
821
822         length = security_sid_to_context(newsid, &newcon, &len);
823         if (length < 0)
824                 goto out2;
825
826         if (len > SIMPLE_TRANSACTION_LIMIT) {
827                 printk(KERN_ERR "SELinux: %s:  context size (%u) exceeds "
828                         "payload max\n", __func__, len);
829                 length = -ERANGE;
830                 goto out3;
831         }
832
833         memcpy(buf, newcon, len);
834         length = len;
835 out3:
836         kfree(newcon);
837 out2:
838         kfree(tcon);
839 out:
840         kfree(scon);
841         return length;
842 }
843
844 static struct inode *sel_make_inode(struct super_block *sb, int mode)
845 {
846         struct inode *ret = new_inode(sb);
847
848         if (ret) {
849                 ret->i_mode = mode;
850                 ret->i_uid = ret->i_gid = 0;
851                 ret->i_blocks = 0;
852                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
853         }
854         return ret;
855 }
856
857 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
858                              size_t count, loff_t *ppos)
859 {
860         char *page = NULL;
861         ssize_t length;
862         ssize_t ret;
863         int cur_enforcing;
864         struct inode *inode = filep->f_path.dentry->d_inode;
865         unsigned index = inode->i_ino & SEL_INO_MASK;
866         const char *name = filep->f_path.dentry->d_name.name;
867
868         mutex_lock(&sel_mutex);
869
870         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
871                 ret = -EINVAL;
872                 goto out;
873         }
874
875         if (count > PAGE_SIZE) {
876                 ret = -EINVAL;
877                 goto out;
878         }
879         page = (char *)get_zeroed_page(GFP_KERNEL);
880         if (!page) {
881                 ret = -ENOMEM;
882                 goto out;
883         }
884
885         cur_enforcing = security_get_bool_value(index);
886         if (cur_enforcing < 0) {
887                 ret = cur_enforcing;
888                 goto out;
889         }
890         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
891                           bool_pending_values[index]);
892         ret = simple_read_from_buffer(buf, count, ppos, page, length);
893 out:
894         mutex_unlock(&sel_mutex);
895         if (page)
896                 free_page((unsigned long)page);
897         return ret;
898 }
899
900 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
901                               size_t count, loff_t *ppos)
902 {
903         char *page = NULL;
904         ssize_t length;
905         int new_value;
906         struct inode *inode = filep->f_path.dentry->d_inode;
907         unsigned index = inode->i_ino & SEL_INO_MASK;
908         const char *name = filep->f_path.dentry->d_name.name;
909
910         mutex_lock(&sel_mutex);
911
912         length = task_has_security(current, SECURITY__SETBOOL);
913         if (length)
914                 goto out;
915
916         if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
917                 length = -EINVAL;
918                 goto out;
919         }
920
921         if (count >= PAGE_SIZE) {
922                 length = -ENOMEM;
923                 goto out;
924         }
925
926         if (*ppos != 0) {
927                 /* No partial writes. */
928                 length = -EINVAL;
929                 goto out;
930         }
931         page = (char *)get_zeroed_page(GFP_KERNEL);
932         if (!page) {
933                 length = -ENOMEM;
934                 goto out;
935         }
936
937         length = -EFAULT;
938         if (copy_from_user(page, buf, count))
939                 goto out;
940
941         length = -EINVAL;
942         if (sscanf(page, "%d", &new_value) != 1)
943                 goto out;
944
945         if (new_value)
946                 new_value = 1;
947
948         bool_pending_values[index] = new_value;
949         length = count;
950
951 out:
952         mutex_unlock(&sel_mutex);
953         if (page)
954                 free_page((unsigned long) page);
955         return length;
956 }
957
958 static const struct file_operations sel_bool_ops = {
959         .read           = sel_read_bool,
960         .write          = sel_write_bool,
961 };
962
963 static ssize_t sel_commit_bools_write(struct file *filep,
964                                       const char __user *buf,
965                                       size_t count, loff_t *ppos)
966 {
967         char *page = NULL;
968         ssize_t length;
969         int new_value;
970
971         mutex_lock(&sel_mutex);
972
973         length = task_has_security(current, SECURITY__SETBOOL);
974         if (length)
975                 goto out;
976
977         if (count >= PAGE_SIZE) {
978                 length = -ENOMEM;
979                 goto out;
980         }
981         if (*ppos != 0) {
982                 /* No partial writes. */
983                 goto out;
984         }
985         page = (char *)get_zeroed_page(GFP_KERNEL);
986         if (!page) {
987                 length = -ENOMEM;
988                 goto out;
989         }
990
991         length = -EFAULT;
992         if (copy_from_user(page, buf, count))
993                 goto out;
994
995         length = -EINVAL;
996         if (sscanf(page, "%d", &new_value) != 1)
997                 goto out;
998
999         if (new_value && bool_pending_values)
1000                 security_set_bools(bool_num, bool_pending_values);
1001
1002         length = count;
1003
1004 out:
1005         mutex_unlock(&sel_mutex);
1006         if (page)
1007                 free_page((unsigned long) page);
1008         return length;
1009 }
1010
1011 static const struct file_operations sel_commit_bools_ops = {
1012         .write          = sel_commit_bools_write,
1013 };
1014
1015 static void sel_remove_entries(struct dentry *de)
1016 {
1017         struct list_head *node;
1018
1019         spin_lock(&dcache_lock);
1020         node = de->d_subdirs.next;
1021         while (node != &de->d_subdirs) {
1022                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1023                 list_del_init(node);
1024
1025                 if (d->d_inode) {
1026                         d = dget_locked(d);
1027                         spin_unlock(&dcache_lock);
1028                         d_delete(d);
1029                         simple_unlink(de->d_inode, d);
1030                         dput(d);
1031                         spin_lock(&dcache_lock);
1032                 }
1033                 node = de->d_subdirs.next;
1034         }
1035
1036         spin_unlock(&dcache_lock);
1037 }
1038
1039 #define BOOL_DIR_NAME "booleans"
1040
1041 static int sel_make_bools(void)
1042 {
1043         int i, ret = 0;
1044         ssize_t len;
1045         struct dentry *dentry = NULL;
1046         struct dentry *dir = bool_dir;
1047         struct inode *inode = NULL;
1048         struct inode_security_struct *isec;
1049         char **names = NULL, *page;
1050         int num;
1051         int *values = NULL;
1052         u32 sid;
1053
1054         /* remove any existing files */
1055         kfree(bool_pending_names);
1056         kfree(bool_pending_values);
1057         bool_pending_names = NULL;
1058         bool_pending_values = NULL;
1059
1060         sel_remove_entries(dir);
1061
1062         page = (char *)get_zeroed_page(GFP_KERNEL);
1063         if (!page)
1064                 return -ENOMEM;
1065
1066         ret = security_get_bools(&num, &names, &values);
1067         if (ret != 0)
1068                 goto out;
1069
1070         for (i = 0; i < num; i++) {
1071                 dentry = d_alloc_name(dir, names[i]);
1072                 if (!dentry) {
1073                         ret = -ENOMEM;
1074                         goto err;
1075                 }
1076                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1077                 if (!inode) {
1078                         ret = -ENOMEM;
1079                         goto err;
1080                 }
1081
1082                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1083                 if (len < 0) {
1084                         ret = -EINVAL;
1085                         goto err;
1086                 } else if (len >= PAGE_SIZE) {
1087                         ret = -ENAMETOOLONG;
1088                         goto err;
1089                 }
1090                 isec = (struct inode_security_struct *)inode->i_security;
1091                 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1092                 if (ret)
1093                         goto err;
1094                 isec->sid = sid;
1095                 isec->initialized = 1;
1096                 inode->i_fop = &sel_bool_ops;
1097                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1098                 d_add(dentry, inode);
1099         }
1100         bool_num = num;
1101         bool_pending_names = names;
1102         bool_pending_values = values;
1103 out:
1104         free_page((unsigned long)page);
1105         return ret;
1106 err:
1107         if (names) {
1108                 for (i = 0; i < num; i++)
1109                         kfree(names[i]);
1110                 kfree(names);
1111         }
1112         kfree(values);
1113         sel_remove_entries(dir);
1114         ret = -ENOMEM;
1115         goto out;
1116 }
1117
1118 #define NULL_FILE_NAME "null"
1119
1120 struct dentry *selinux_null;
1121
1122 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1123                                             size_t count, loff_t *ppos)
1124 {
1125         char tmpbuf[TMPBUFLEN];
1126         ssize_t length;
1127
1128         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1129         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1130 }
1131
1132 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1133                                              const char __user *buf,
1134                                              size_t count, loff_t *ppos)
1135
1136 {
1137         char *page;
1138         ssize_t ret;
1139         int new_value;
1140
1141         if (count >= PAGE_SIZE) {
1142                 ret = -ENOMEM;
1143                 goto out;
1144         }
1145
1146         if (*ppos != 0) {
1147                 /* No partial writes. */
1148                 ret = -EINVAL;
1149                 goto out;
1150         }
1151
1152         page = (char *)get_zeroed_page(GFP_KERNEL);
1153         if (!page) {
1154                 ret = -ENOMEM;
1155                 goto out;
1156         }
1157
1158         if (copy_from_user(page, buf, count)) {
1159                 ret = -EFAULT;
1160                 goto out_free;
1161         }
1162
1163         if (sscanf(page, "%u", &new_value) != 1) {
1164                 ret = -EINVAL;
1165                 goto out;
1166         }
1167
1168         if (new_value != avc_cache_threshold) {
1169                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1170                 if (ret)
1171                         goto out_free;
1172                 avc_cache_threshold = new_value;
1173         }
1174         ret = count;
1175 out_free:
1176         free_page((unsigned long)page);
1177 out:
1178         return ret;
1179 }
1180
1181 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1182                                        size_t count, loff_t *ppos)
1183 {
1184         char *page;
1185         ssize_t ret = 0;
1186
1187         page = (char *)__get_free_page(GFP_KERNEL);
1188         if (!page) {
1189                 ret = -ENOMEM;
1190                 goto out;
1191         }
1192         ret = avc_get_hash_stats(page);
1193         if (ret >= 0)
1194                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1195         free_page((unsigned long)page);
1196 out:
1197         return ret;
1198 }
1199
1200 static const struct file_operations sel_avc_cache_threshold_ops = {
1201         .read           = sel_read_avc_cache_threshold,
1202         .write          = sel_write_avc_cache_threshold,
1203 };
1204
1205 static const struct file_operations sel_avc_hash_stats_ops = {
1206         .read           = sel_read_avc_hash_stats,
1207 };
1208
1209 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1210 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1211 {
1212         int cpu;
1213
1214         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1215                 if (!cpu_possible(cpu))
1216                         continue;
1217                 *idx = cpu + 1;
1218                 return &per_cpu(avc_cache_stats, cpu);
1219         }
1220         return NULL;
1221 }
1222
1223 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1224 {
1225         loff_t n = *pos - 1;
1226
1227         if (*pos == 0)
1228                 return SEQ_START_TOKEN;
1229
1230         return sel_avc_get_stat_idx(&n);
1231 }
1232
1233 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1234 {
1235         return sel_avc_get_stat_idx(pos);
1236 }
1237
1238 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1239 {
1240         struct avc_cache_stats *st = v;
1241
1242         if (v == SEQ_START_TOKEN)
1243                 seq_printf(seq, "lookups hits misses allocations reclaims "
1244                            "frees\n");
1245         else
1246                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1247                            st->hits, st->misses, st->allocations,
1248                            st->reclaims, st->frees);
1249         return 0;
1250 }
1251
1252 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1253 { }
1254
1255 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1256         .start          = sel_avc_stats_seq_start,
1257         .next           = sel_avc_stats_seq_next,
1258         .show           = sel_avc_stats_seq_show,
1259         .stop           = sel_avc_stats_seq_stop,
1260 };
1261
1262 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1263 {
1264         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1265 }
1266
1267 static const struct file_operations sel_avc_cache_stats_ops = {
1268         .open           = sel_open_avc_cache_stats,
1269         .read           = seq_read,
1270         .llseek         = seq_lseek,
1271         .release        = seq_release,
1272 };
1273 #endif
1274
1275 static int sel_make_avc_files(struct dentry *dir)
1276 {
1277         int i, ret = 0;
1278         static struct tree_descr files[] = {
1279                 { "cache_threshold",
1280                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1281                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1282 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1283                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1284 #endif
1285         };
1286
1287         for (i = 0; i < ARRAY_SIZE(files); i++) {
1288                 struct inode *inode;
1289                 struct dentry *dentry;
1290
1291                 dentry = d_alloc_name(dir, files[i].name);
1292                 if (!dentry) {
1293                         ret = -ENOMEM;
1294                         goto out;
1295                 }
1296
1297                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1298                 if (!inode) {
1299                         ret = -ENOMEM;
1300                         goto out;
1301                 }
1302                 inode->i_fop = files[i].ops;
1303                 inode->i_ino = ++sel_last_ino;
1304                 d_add(dentry, inode);
1305         }
1306 out:
1307         return ret;
1308 }
1309
1310 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1311                                 size_t count, loff_t *ppos)
1312 {
1313         struct inode *inode;
1314         char *con;
1315         u32 sid, len;
1316         ssize_t ret;
1317
1318         inode = file->f_path.dentry->d_inode;
1319         sid = inode->i_ino&SEL_INO_MASK;
1320         ret = security_sid_to_context(sid, &con, &len);
1321         if (ret < 0)
1322                 return ret;
1323
1324         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1325         kfree(con);
1326         return ret;
1327 }
1328
1329 static const struct file_operations sel_initcon_ops = {
1330         .read           = sel_read_initcon,
1331 };
1332
1333 static int sel_make_initcon_files(struct dentry *dir)
1334 {
1335         int i, ret = 0;
1336
1337         for (i = 1; i <= SECINITSID_NUM; i++) {
1338                 struct inode *inode;
1339                 struct dentry *dentry;
1340                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1341                 if (!dentry) {
1342                         ret = -ENOMEM;
1343                         goto out;
1344                 }
1345
1346                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1347                 if (!inode) {
1348                         ret = -ENOMEM;
1349                         goto out;
1350                 }
1351                 inode->i_fop = &sel_initcon_ops;
1352                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1353                 d_add(dentry, inode);
1354         }
1355 out:
1356         return ret;
1357 }
1358
1359 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1360 {
1361         return a / b - (a % b < 0);
1362 }
1363
1364 static inline unsigned long sel_class_to_ino(u16 class)
1365 {
1366         return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1367 }
1368
1369 static inline u16 sel_ino_to_class(unsigned long ino)
1370 {
1371         return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1372 }
1373
1374 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1375 {
1376         return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1377 }
1378
1379 static inline u32 sel_ino_to_perm(unsigned long ino)
1380 {
1381         return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1382 }
1383
1384 static ssize_t sel_read_class(struct file *file, char __user *buf,
1385                                 size_t count, loff_t *ppos)
1386 {
1387         ssize_t rc, len;
1388         char *page;
1389         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1390
1391         page = (char *)__get_free_page(GFP_KERNEL);
1392         if (!page) {
1393                 rc = -ENOMEM;
1394                 goto out;
1395         }
1396
1397         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1398         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1399         free_page((unsigned long)page);
1400 out:
1401         return rc;
1402 }
1403
1404 static const struct file_operations sel_class_ops = {
1405         .read           = sel_read_class,
1406 };
1407
1408 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1409                                 size_t count, loff_t *ppos)
1410 {
1411         ssize_t rc, len;
1412         char *page;
1413         unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1414
1415         page = (char *)__get_free_page(GFP_KERNEL);
1416         if (!page) {
1417                 rc = -ENOMEM;
1418                 goto out;
1419         }
1420
1421         len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1422         rc = simple_read_from_buffer(buf, count, ppos, page, len);
1423         free_page((unsigned long)page);
1424 out:
1425         return rc;
1426 }
1427
1428 static const struct file_operations sel_perm_ops = {
1429         .read           = sel_read_perm,
1430 };
1431
1432 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1433                                   size_t count, loff_t *ppos)
1434 {
1435         int value;
1436         char tmpbuf[TMPBUFLEN];
1437         ssize_t length;
1438         unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1439
1440         value = security_policycap_supported(i_ino & SEL_INO_MASK);
1441         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1442
1443         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1444 }
1445
1446 static const struct file_operations sel_policycap_ops = {
1447         .read           = sel_read_policycap,
1448 };
1449
1450 static int sel_make_perm_files(char *objclass, int classvalue,
1451                                 struct dentry *dir)
1452 {
1453         int i, rc = 0, nperms;
1454         char **perms;
1455
1456         rc = security_get_permissions(objclass, &perms, &nperms);
1457         if (rc)
1458                 goto out;
1459
1460         for (i = 0; i < nperms; i++) {
1461                 struct inode *inode;
1462                 struct dentry *dentry;
1463
1464                 dentry = d_alloc_name(dir, perms[i]);
1465                 if (!dentry) {
1466                         rc = -ENOMEM;
1467                         goto out1;
1468                 }
1469
1470                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1471                 if (!inode) {
1472                         rc = -ENOMEM;
1473                         goto out1;
1474                 }
1475                 inode->i_fop = &sel_perm_ops;
1476                 /* i+1 since perm values are 1-indexed */
1477                 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1478                 d_add(dentry, inode);
1479         }
1480
1481 out1:
1482         for (i = 0; i < nperms; i++)
1483                 kfree(perms[i]);
1484         kfree(perms);
1485 out:
1486         return rc;
1487 }
1488
1489 static int sel_make_class_dir_entries(char *classname, int index,
1490                                         struct dentry *dir)
1491 {
1492         struct dentry *dentry = NULL;
1493         struct inode *inode = NULL;
1494         int rc;
1495
1496         dentry = d_alloc_name(dir, "index");
1497         if (!dentry) {
1498                 rc = -ENOMEM;
1499                 goto out;
1500         }
1501
1502         inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1503         if (!inode) {
1504                 rc = -ENOMEM;
1505                 goto out;
1506         }
1507
1508         inode->i_fop = &sel_class_ops;
1509         inode->i_ino = sel_class_to_ino(index);
1510         d_add(dentry, inode);
1511
1512         dentry = d_alloc_name(dir, "perms");
1513         if (!dentry) {
1514                 rc = -ENOMEM;
1515                 goto out;
1516         }
1517
1518         rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1519         if (rc)
1520                 goto out;
1521
1522         rc = sel_make_perm_files(classname, index, dentry);
1523
1524 out:
1525         return rc;
1526 }
1527
1528 static void sel_remove_classes(void)
1529 {
1530         struct list_head *class_node;
1531
1532         list_for_each(class_node, &class_dir->d_subdirs) {
1533                 struct dentry *class_subdir = list_entry(class_node,
1534                                         struct dentry, d_u.d_child);
1535                 struct list_head *class_subdir_node;
1536
1537                 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1538                         struct dentry *d = list_entry(class_subdir_node,
1539                                                 struct dentry, d_u.d_child);
1540
1541                         if (d->d_inode)
1542                                 if (d->d_inode->i_mode & S_IFDIR)
1543                                         sel_remove_entries(d);
1544                 }
1545
1546                 sel_remove_entries(class_subdir);
1547         }
1548
1549         sel_remove_entries(class_dir);
1550 }
1551
1552 static int sel_make_classes(void)
1553 {
1554         int rc = 0, nclasses, i;
1555         char **classes;
1556
1557         /* delete any existing entries */
1558         sel_remove_classes();
1559
1560         rc = security_get_classes(&classes, &nclasses);
1561         if (rc < 0)
1562                 goto out;
1563
1564         /* +2 since classes are 1-indexed */
1565         last_class_ino = sel_class_to_ino(nclasses+2);
1566
1567         for (i = 0; i < nclasses; i++) {
1568                 struct dentry *class_name_dir;
1569
1570                 class_name_dir = d_alloc_name(class_dir, classes[i]);
1571                 if (!class_name_dir) {
1572                         rc = -ENOMEM;
1573                         goto out1;
1574                 }
1575
1576                 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1577                                 &last_class_ino);
1578                 if (rc)
1579                         goto out1;
1580
1581                 /* i+1 since class values are 1-indexed */
1582                 rc = sel_make_class_dir_entries(classes[i], i+1,
1583                                 class_name_dir);
1584                 if (rc)
1585                         goto out1;
1586         }
1587
1588 out1:
1589         for (i = 0; i < nclasses; i++)
1590                 kfree(classes[i]);
1591         kfree(classes);
1592 out:
1593         return rc;
1594 }
1595
1596 static int sel_make_policycap(void)
1597 {
1598         unsigned int iter;
1599         struct dentry *dentry = NULL;
1600         struct inode *inode = NULL;
1601
1602         sel_remove_entries(policycap_dir);
1603
1604         for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1605                 if (iter < ARRAY_SIZE(policycap_names))
1606                         dentry = d_alloc_name(policycap_dir,
1607                                               policycap_names[iter]);
1608                 else
1609                         dentry = d_alloc_name(policycap_dir, "unknown");
1610
1611                 if (dentry == NULL)
1612                         return -ENOMEM;
1613
1614                 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1615                 if (inode == NULL)
1616                         return -ENOMEM;
1617
1618                 inode->i_fop = &sel_policycap_ops;
1619                 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1620                 d_add(dentry, inode);
1621         }
1622
1623         return 0;
1624 }
1625
1626 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1627                         unsigned long *ino)
1628 {
1629         int ret = 0;
1630         struct inode *inode;
1631
1632         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1633         if (!inode) {
1634                 ret = -ENOMEM;
1635                 goto out;
1636         }
1637         inode->i_op = &simple_dir_inode_operations;
1638         inode->i_fop = &simple_dir_operations;
1639         inode->i_ino = ++(*ino);
1640         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1641         inc_nlink(inode);
1642         d_add(dentry, inode);
1643         /* bump link count on parent directory, too */
1644         inc_nlink(dir);
1645 out:
1646         return ret;
1647 }
1648
1649 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1650 {
1651         int ret;
1652         struct dentry *dentry;
1653         struct inode *inode, *root_inode;
1654         struct inode_security_struct *isec;
1655
1656         static struct tree_descr selinux_files[] = {
1657                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1658                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1659                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1660                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1661                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1662                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1663                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1664                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1665                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1666                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1667                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1668                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1669                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1670                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1671                 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1672                 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1673                 /* last one */ {""}
1674         };
1675         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1676         if (ret)
1677                 goto err;
1678
1679         root_inode = sb->s_root->d_inode;
1680
1681         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1682         if (!dentry) {
1683                 ret = -ENOMEM;
1684                 goto err;
1685         }
1686
1687         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1688         if (ret)
1689                 goto err;
1690
1691         bool_dir = dentry;
1692
1693         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1694         if (!dentry) {
1695                 ret = -ENOMEM;
1696                 goto err;
1697         }
1698
1699         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1700         if (!inode) {
1701                 ret = -ENOMEM;
1702                 goto err;
1703         }
1704         inode->i_ino = ++sel_last_ino;
1705         isec = (struct inode_security_struct *)inode->i_security;
1706         isec->sid = SECINITSID_DEVNULL;
1707         isec->sclass = SECCLASS_CHR_FILE;
1708         isec->initialized = 1;
1709
1710         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1711         d_add(dentry, inode);
1712         selinux_null = dentry;
1713
1714         dentry = d_alloc_name(sb->s_root, "avc");
1715         if (!dentry) {
1716                 ret = -ENOMEM;
1717                 goto err;
1718         }
1719
1720         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1721         if (ret)
1722                 goto err;
1723
1724         ret = sel_make_avc_files(dentry);
1725         if (ret)
1726                 goto err;
1727
1728         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1729         if (!dentry) {
1730                 ret = -ENOMEM;
1731                 goto err;
1732         }
1733
1734         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1735         if (ret)
1736                 goto err;
1737
1738         ret = sel_make_initcon_files(dentry);
1739         if (ret)
1740                 goto err;
1741
1742         dentry = d_alloc_name(sb->s_root, "class");
1743         if (!dentry) {
1744                 ret = -ENOMEM;
1745                 goto err;
1746         }
1747
1748         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1749         if (ret)
1750                 goto err;
1751
1752         class_dir = dentry;
1753
1754         dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1755         if (!dentry) {
1756                 ret = -ENOMEM;
1757                 goto err;
1758         }
1759
1760         ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1761         if (ret)
1762                 goto err;
1763
1764         policycap_dir = dentry;
1765
1766 out:
1767         return ret;
1768 err:
1769         printk(KERN_ERR "SELinux: %s:  failed while creating inodes\n",
1770                 __func__);
1771         goto out;
1772 }
1773
1774 static int sel_get_sb(struct file_system_type *fs_type,
1775                       int flags, const char *dev_name, void *data,
1776                       struct vfsmount *mnt)
1777 {
1778         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1779 }
1780
1781 static struct file_system_type sel_fs_type = {
1782         .name           = "selinuxfs",
1783         .get_sb         = sel_get_sb,
1784         .kill_sb        = kill_litter_super,
1785 };
1786
1787 struct vfsmount *selinuxfs_mount;
1788
1789 static int __init init_sel_fs(void)
1790 {
1791         int err;
1792
1793         if (!selinux_enabled)
1794                 return 0;
1795         err = register_filesystem(&sel_fs_type);
1796         if (!err) {
1797                 selinuxfs_mount = kern_mount(&sel_fs_type);
1798                 if (IS_ERR(selinuxfs_mount)) {
1799                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1800                         err = PTR_ERR(selinuxfs_mount);
1801                         selinuxfs_mount = NULL;
1802                 }
1803         }
1804         return err;
1805 }
1806
1807 __initcall(init_sel_fs);
1808
1809 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1810 void exit_sel_fs(void)
1811 {
1812         unregister_filesystem(&sel_fs_type);
1813 }
1814 #endif