[PATCH] selinux: kfree cleanup
[linux-3.10.git] / security / selinux / selinuxfs.c
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2  *
3  *      Added conditional policy language extensions
4  *
5  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
6  * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
7  *      This program is free software; you can redistribute it and/or modify
8  *      it under the terms of the GNU General Public License as published by
9  *      the Free Software Foundation, version 2.
10  */
11
12 #include <linux/config.h>
13 #include <linux/kernel.h>
14 #include <linux/pagemap.h>
15 #include <linux/slab.h>
16 #include <linux/vmalloc.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/string.h>
20 #include <linux/security.h>
21 #include <linux/major.h>
22 #include <linux/seq_file.h>
23 #include <linux/percpu.h>
24 #include <asm/uaccess.h>
25 #include <asm/semaphore.h>
26
27 /* selinuxfs pseudo filesystem for exporting the security policy API.
28    Based on the proc code and the fs/nfsd/nfsctl.c code. */
29
30 #include "flask.h"
31 #include "avc.h"
32 #include "avc_ss.h"
33 #include "security.h"
34 #include "objsec.h"
35 #include "conditional.h"
36
37 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
38
39 static int __init checkreqprot_setup(char *str)
40 {
41         selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
42         return 1;
43 }
44 __setup("checkreqprot=", checkreqprot_setup);
45
46
47 static DECLARE_MUTEX(sel_sem);
48
49 /* global data for booleans */
50 static struct dentry *bool_dir = NULL;
51 static int bool_num = 0;
52 static int *bool_pending_values = NULL;
53
54 extern void selnl_notify_setenforce(int val);
55
56 /* Check whether a task is allowed to use a security operation. */
57 static int task_has_security(struct task_struct *tsk,
58                              u32 perms)
59 {
60         struct task_security_struct *tsec;
61
62         tsec = tsk->security;
63         if (!tsec)
64                 return -EACCES;
65
66         return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
67                             SECCLASS_SECURITY, perms, NULL);
68 }
69
70 enum sel_inos {
71         SEL_ROOT_INO = 2,
72         SEL_LOAD,       /* load policy */
73         SEL_ENFORCE,    /* get or set enforcing status */
74         SEL_CONTEXT,    /* validate context */
75         SEL_ACCESS,     /* compute access decision */
76         SEL_CREATE,     /* compute create labeling decision */
77         SEL_RELABEL,    /* compute relabeling decision */
78         SEL_USER,       /* compute reachable user contexts */
79         SEL_POLICYVERS, /* return policy version for this kernel */
80         SEL_COMMIT_BOOLS, /* commit new boolean values */
81         SEL_MLS,        /* return if MLS policy is enabled */
82         SEL_DISABLE,    /* disable SELinux until next reboot */
83         SEL_AVC,        /* AVC management directory */
84         SEL_MEMBER,     /* compute polyinstantiation membership decision */
85         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
86 };
87
88 #define TMPBUFLEN       12
89 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
90                                 size_t count, loff_t *ppos)
91 {
92         char tmpbuf[TMPBUFLEN];
93         ssize_t length;
94
95         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
96         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
97 }
98
99 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
100 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
101                                  size_t count, loff_t *ppos)
102
103 {
104         char *page;
105         ssize_t length;
106         int new_value;
107
108         if (count < 0 || count >= PAGE_SIZE)
109                 return -ENOMEM;
110         if (*ppos != 0) {
111                 /* No partial writes. */
112                 return -EINVAL;
113         }
114         page = (char*)get_zeroed_page(GFP_KERNEL);
115         if (!page)
116                 return -ENOMEM;
117         length = -EFAULT;
118         if (copy_from_user(page, buf, count))
119                 goto out;
120
121         length = -EINVAL;
122         if (sscanf(page, "%d", &new_value) != 1)
123                 goto out;
124
125         if (new_value != selinux_enforcing) {
126                 length = task_has_security(current, SECURITY__SETENFORCE);
127                 if (length)
128                         goto out;
129                 selinux_enforcing = new_value;
130                 if (selinux_enforcing)
131                         avc_ss_reset(0);
132                 selnl_notify_setenforce(selinux_enforcing);
133         }
134         length = count;
135 out:
136         free_page((unsigned long) page);
137         return length;
138 }
139 #else
140 #define sel_write_enforce NULL
141 #endif
142
143 static struct file_operations sel_enforce_ops = {
144         .read           = sel_read_enforce,
145         .write          = sel_write_enforce,
146 };
147
148 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
149 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
150                                  size_t count, loff_t *ppos)
151
152 {
153         char *page;
154         ssize_t length;
155         int new_value;
156         extern int selinux_disable(void);
157
158         if (count < 0 || count >= PAGE_SIZE)
159                 return -ENOMEM;
160         if (*ppos != 0) {
161                 /* No partial writes. */
162                 return -EINVAL;
163         }
164         page = (char*)get_zeroed_page(GFP_KERNEL);
165         if (!page)
166                 return -ENOMEM;
167         length = -EFAULT;
168         if (copy_from_user(page, buf, count))
169                 goto out;
170
171         length = -EINVAL;
172         if (sscanf(page, "%d", &new_value) != 1)
173                 goto out;
174
175         if (new_value) {
176                 length = selinux_disable();
177                 if (length < 0)
178                         goto out;
179         }
180
181         length = count;
182 out:
183         free_page((unsigned long) page);
184         return length;
185 }
186 #else
187 #define sel_write_disable NULL
188 #endif
189
190 static struct file_operations sel_disable_ops = {
191         .write          = sel_write_disable,
192 };
193
194 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
195                                    size_t count, loff_t *ppos)
196 {
197         char tmpbuf[TMPBUFLEN];
198         ssize_t length;
199
200         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
201         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
202 }
203
204 static struct file_operations sel_policyvers_ops = {
205         .read           = sel_read_policyvers,
206 };
207
208 /* declaration for sel_write_load */
209 static int sel_make_bools(void);
210
211 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
212                                 size_t count, loff_t *ppos)
213 {
214         char tmpbuf[TMPBUFLEN];
215         ssize_t length;
216
217         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
218         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
219 }
220
221 static struct file_operations sel_mls_ops = {
222         .read           = sel_read_mls,
223 };
224
225 static ssize_t sel_write_load(struct file * file, const char __user * buf,
226                               size_t count, loff_t *ppos)
227
228 {
229         int ret;
230         ssize_t length;
231         void *data = NULL;
232
233         down(&sel_sem);
234
235         length = task_has_security(current, SECURITY__LOAD_POLICY);
236         if (length)
237                 goto out;
238
239         if (*ppos != 0) {
240                 /* No partial writes. */
241                 length = -EINVAL;
242                 goto out;
243         }
244
245         if ((count < 0) || (count > 64 * 1024 * 1024)
246             || (data = vmalloc(count)) == NULL) {
247                 length = -ENOMEM;
248                 goto out;
249         }
250
251         length = -EFAULT;
252         if (copy_from_user(data, buf, count) != 0)
253                 goto out;
254
255         length = security_load_policy(data, count);
256         if (length)
257                 goto out;
258
259         ret = sel_make_bools();
260         if (ret)
261                 length = ret;
262         else
263                 length = count;
264 out:
265         up(&sel_sem);
266         vfree(data);
267         return length;
268 }
269
270 static struct file_operations sel_load_ops = {
271         .write          = sel_write_load,
272 };
273
274
275 static ssize_t sel_write_context(struct file * file, const char __user * buf,
276                                  size_t count, loff_t *ppos)
277
278 {
279         char *page;
280         u32 sid;
281         ssize_t length;
282
283         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
284         if (length)
285                 return length;
286
287         if (count < 0 || count >= PAGE_SIZE)
288                 return -ENOMEM;
289         if (*ppos != 0) {
290                 /* No partial writes. */
291                 return -EINVAL;
292         }
293         page = (char*)get_zeroed_page(GFP_KERNEL);
294         if (!page)
295                 return -ENOMEM;
296         length = -EFAULT;
297         if (copy_from_user(page, buf, count))
298                 goto out;
299
300         length = security_context_to_sid(page, count, &sid);
301         if (length < 0)
302                 goto out;
303
304         length = count;
305 out:
306         free_page((unsigned long) page);
307         return length;
308 }
309
310 static struct file_operations sel_context_ops = {
311         .write          = sel_write_context,
312 };
313
314 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
315                                      size_t count, loff_t *ppos)
316 {
317         char tmpbuf[TMPBUFLEN];
318         ssize_t length;
319
320         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
321         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
322 }
323
324 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
325                                       size_t count, loff_t *ppos)
326 {
327         char *page;
328         ssize_t length;
329         unsigned int new_value;
330
331         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
332         if (length)
333                 return length;
334
335         if (count < 0 || count >= PAGE_SIZE)
336                 return -ENOMEM;
337         if (*ppos != 0) {
338                 /* No partial writes. */
339                 return -EINVAL;
340         }
341         page = (char*)get_zeroed_page(GFP_KERNEL);
342         if (!page)
343                 return -ENOMEM;
344         length = -EFAULT;
345         if (copy_from_user(page, buf, count))
346                 goto out;
347
348         length = -EINVAL;
349         if (sscanf(page, "%u", &new_value) != 1)
350                 goto out;
351
352         selinux_checkreqprot = new_value ? 1 : 0;
353         length = count;
354 out:
355         free_page((unsigned long) page);
356         return length;
357 }
358 static struct file_operations sel_checkreqprot_ops = {
359         .read           = sel_read_checkreqprot,
360         .write          = sel_write_checkreqprot,
361 };
362
363 /*
364  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
365  */
366 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
367 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
368 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
369 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
370 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
371
372 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
373         [SEL_ACCESS] = sel_write_access,
374         [SEL_CREATE] = sel_write_create,
375         [SEL_RELABEL] = sel_write_relabel,
376         [SEL_USER] = sel_write_user,
377         [SEL_MEMBER] = sel_write_member,
378 };
379
380 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
381 {
382         ino_t ino =  file->f_dentry->d_inode->i_ino;
383         char *data;
384         ssize_t rv;
385
386         if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
387                 return -EINVAL;
388
389         data = simple_transaction_get(file, buf, size);
390         if (IS_ERR(data))
391                 return PTR_ERR(data);
392
393         rv =  write_op[ino](file, data, size);
394         if (rv>0) {
395                 simple_transaction_set(file, rv);
396                 rv = size;
397         }
398         return rv;
399 }
400
401 static struct file_operations transaction_ops = {
402         .write          = selinux_transaction_write,
403         .read           = simple_transaction_read,
404         .release        = simple_transaction_release,
405 };
406
407 /*
408  * payload - write methods
409  * If the method has a response, the response should be put in buf,
410  * and the length returned.  Otherwise return 0 or and -error.
411  */
412
413 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
414 {
415         char *scon, *tcon;
416         u32 ssid, tsid;
417         u16 tclass;
418         u32 req;
419         struct av_decision avd;
420         ssize_t length;
421
422         length = task_has_security(current, SECURITY__COMPUTE_AV);
423         if (length)
424                 return length;
425
426         length = -ENOMEM;
427         scon = kmalloc(size+1, GFP_KERNEL);
428         if (!scon)
429                 return length;
430         memset(scon, 0, size+1);
431
432         tcon = kmalloc(size+1, GFP_KERNEL);
433         if (!tcon)
434                 goto out;
435         memset(tcon, 0, size+1);
436
437         length = -EINVAL;
438         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
439                 goto out2;
440
441         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
442         if (length < 0)
443                 goto out2;
444         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
445         if (length < 0)
446                 goto out2;
447
448         length = security_compute_av(ssid, tsid, tclass, req, &avd);
449         if (length < 0)
450                 goto out2;
451
452         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
453                           "%x %x %x %x %u",
454                           avd.allowed, avd.decided,
455                           avd.auditallow, avd.auditdeny,
456                           avd.seqno);
457 out2:
458         kfree(tcon);
459 out:
460         kfree(scon);
461         return length;
462 }
463
464 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
465 {
466         char *scon, *tcon;
467         u32 ssid, tsid, newsid;
468         u16 tclass;
469         ssize_t length;
470         char *newcon;
471         u32 len;
472
473         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
474         if (length)
475                 return length;
476
477         length = -ENOMEM;
478         scon = kmalloc(size+1, GFP_KERNEL);
479         if (!scon)
480                 return length;
481         memset(scon, 0, size+1);
482
483         tcon = kmalloc(size+1, GFP_KERNEL);
484         if (!tcon)
485                 goto out;
486         memset(tcon, 0, size+1);
487
488         length = -EINVAL;
489         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
490                 goto out2;
491
492         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
493         if (length < 0)
494                 goto out2;
495         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
496         if (length < 0)
497                 goto out2;
498
499         length = security_transition_sid(ssid, tsid, tclass, &newsid);
500         if (length < 0)
501                 goto out2;
502
503         length = security_sid_to_context(newsid, &newcon, &len);
504         if (length < 0)
505                 goto out2;
506
507         if (len > SIMPLE_TRANSACTION_LIMIT) {
508                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
509                        "max\n", __FUNCTION__, len);
510                 length = -ERANGE;
511                 goto out3;
512         }
513
514         memcpy(buf, newcon, len);
515         length = len;
516 out3:
517         kfree(newcon);
518 out2:
519         kfree(tcon);
520 out:
521         kfree(scon);
522         return length;
523 }
524
525 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
526 {
527         char *scon, *tcon;
528         u32 ssid, tsid, newsid;
529         u16 tclass;
530         ssize_t length;
531         char *newcon;
532         u32 len;
533
534         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
535         if (length)
536                 return length;
537
538         length = -ENOMEM;
539         scon = kmalloc(size+1, GFP_KERNEL);
540         if (!scon)
541                 return length;
542         memset(scon, 0, size+1);
543
544         tcon = kmalloc(size+1, GFP_KERNEL);
545         if (!tcon)
546                 goto out;
547         memset(tcon, 0, size+1);
548
549         length = -EINVAL;
550         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
551                 goto out2;
552
553         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
554         if (length < 0)
555                 goto out2;
556         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
557         if (length < 0)
558                 goto out2;
559
560         length = security_change_sid(ssid, tsid, tclass, &newsid);
561         if (length < 0)
562                 goto out2;
563
564         length = security_sid_to_context(newsid, &newcon, &len);
565         if (length < 0)
566                 goto out2;
567
568         if (len > SIMPLE_TRANSACTION_LIMIT) {
569                 length = -ERANGE;
570                 goto out3;
571         }
572
573         memcpy(buf, newcon, len);
574         length = len;
575 out3:
576         kfree(newcon);
577 out2:
578         kfree(tcon);
579 out:
580         kfree(scon);
581         return length;
582 }
583
584 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
585 {
586         char *con, *user, *ptr;
587         u32 sid, *sids;
588         ssize_t length;
589         char *newcon;
590         int i, rc;
591         u32 len, nsids;
592
593         length = task_has_security(current, SECURITY__COMPUTE_USER);
594         if (length)
595                 return length;
596
597         length = -ENOMEM;
598         con = kmalloc(size+1, GFP_KERNEL);
599         if (!con)
600                 return length;
601         memset(con, 0, size+1);
602
603         user = kmalloc(size+1, GFP_KERNEL);
604         if (!user)
605                 goto out;
606         memset(user, 0, size+1);
607
608         length = -EINVAL;
609         if (sscanf(buf, "%s %s", con, user) != 2)
610                 goto out2;
611
612         length = security_context_to_sid(con, strlen(con)+1, &sid);
613         if (length < 0)
614                 goto out2;
615
616         length = security_get_user_sids(sid, user, &sids, &nsids);
617         if (length < 0)
618                 goto out2;
619
620         length = sprintf(buf, "%u", nsids) + 1;
621         ptr = buf + length;
622         for (i = 0; i < nsids; i++) {
623                 rc = security_sid_to_context(sids[i], &newcon, &len);
624                 if (rc) {
625                         length = rc;
626                         goto out3;
627                 }
628                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
629                         kfree(newcon);
630                         length = -ERANGE;
631                         goto out3;
632                 }
633                 memcpy(ptr, newcon, len);
634                 kfree(newcon);
635                 ptr += len;
636                 length += len;
637         }
638 out3:
639         kfree(sids);
640 out2:
641         kfree(user);
642 out:
643         kfree(con);
644         return length;
645 }
646
647 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
648 {
649         char *scon, *tcon;
650         u32 ssid, tsid, newsid;
651         u16 tclass;
652         ssize_t length;
653         char *newcon;
654         u32 len;
655
656         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
657         if (length)
658                 return length;
659
660         length = -ENOMEM;
661         scon = kmalloc(size+1, GFP_KERNEL);
662         if (!scon)
663                 return length;
664         memset(scon, 0, size+1);
665
666         tcon = kmalloc(size+1, GFP_KERNEL);
667         if (!tcon)
668                 goto out;
669         memset(tcon, 0, size+1);
670
671         length = -EINVAL;
672         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
673                 goto out2;
674
675         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
676         if (length < 0)
677                 goto out2;
678         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
679         if (length < 0)
680                 goto out2;
681
682         length = security_member_sid(ssid, tsid, tclass, &newsid);
683         if (length < 0)
684                 goto out2;
685
686         length = security_sid_to_context(newsid, &newcon, &len);
687         if (length < 0)
688                 goto out2;
689
690         if (len > SIMPLE_TRANSACTION_LIMIT) {
691                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
692                        "max\n", __FUNCTION__, len);
693                 length = -ERANGE;
694                 goto out3;
695         }
696
697         memcpy(buf, newcon, len);
698         length = len;
699 out3:
700         kfree(newcon);
701 out2:
702         kfree(tcon);
703 out:
704         kfree(scon);
705         return length;
706 }
707
708 static struct inode *sel_make_inode(struct super_block *sb, int mode)
709 {
710         struct inode *ret = new_inode(sb);
711
712         if (ret) {
713                 ret->i_mode = mode;
714                 ret->i_uid = ret->i_gid = 0;
715                 ret->i_blksize = PAGE_CACHE_SIZE;
716                 ret->i_blocks = 0;
717                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
718         }
719         return ret;
720 }
721
722 #define BOOL_INO_OFFSET 30
723
724 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
725                              size_t count, loff_t *ppos)
726 {
727         char *page = NULL;
728         ssize_t length;
729         ssize_t end;
730         ssize_t ret;
731         int cur_enforcing;
732         struct inode *inode;
733
734         down(&sel_sem);
735
736         ret = -EFAULT;
737
738         /* check to see if this file has been deleted */
739         if (!filep->f_op)
740                 goto out;
741
742         if (count < 0 || count > PAGE_SIZE) {
743                 ret = -EINVAL;
744                 goto out;
745         }
746         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
747                 ret = -ENOMEM;
748                 goto out;
749         }
750
751         inode = filep->f_dentry->d_inode;
752         cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
753         if (cur_enforcing < 0) {
754                 ret = cur_enforcing;
755                 goto out;
756         }
757
758         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
759                           bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
760         if (length < 0) {
761                 ret = length;
762                 goto out;
763         }
764
765         if (*ppos >= length) {
766                 ret = 0;
767                 goto out;
768         }
769         if (count + *ppos > length)
770                 count = length - *ppos;
771         end = count + *ppos;
772         if (copy_to_user(buf, (char *) page + *ppos, count)) {
773                 ret = -EFAULT;
774                 goto out;
775         }
776         *ppos = end;
777         ret = count;
778 out:
779         up(&sel_sem);
780         if (page)
781                 free_page((unsigned long)page);
782         return ret;
783 }
784
785 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
786                               size_t count, loff_t *ppos)
787 {
788         char *page = NULL;
789         ssize_t length = -EFAULT;
790         int new_value;
791         struct inode *inode;
792
793         down(&sel_sem);
794
795         length = task_has_security(current, SECURITY__SETBOOL);
796         if (length)
797                 goto out;
798
799         /* check to see if this file has been deleted */
800         if (!filep->f_op)
801                 goto out;
802
803         if (count < 0 || count >= PAGE_SIZE) {
804                 length = -ENOMEM;
805                 goto out;
806         }
807         if (*ppos != 0) {
808                 /* No partial writes. */
809                 goto out;
810         }
811         page = (char*)get_zeroed_page(GFP_KERNEL);
812         if (!page) {
813                 length = -ENOMEM;
814                 goto out;
815         }
816
817         if (copy_from_user(page, buf, count))
818                 goto out;
819
820         length = -EINVAL;
821         if (sscanf(page, "%d", &new_value) != 1)
822                 goto out;
823
824         if (new_value)
825                 new_value = 1;
826
827         inode = filep->f_dentry->d_inode;
828         bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
829         length = count;
830
831 out:
832         up(&sel_sem);
833         if (page)
834                 free_page((unsigned long) page);
835         return length;
836 }
837
838 static struct file_operations sel_bool_ops = {
839         .read           = sel_read_bool,
840         .write          = sel_write_bool,
841 };
842
843 static ssize_t sel_commit_bools_write(struct file *filep,
844                                       const char __user *buf,
845                                       size_t count, loff_t *ppos)
846 {
847         char *page = NULL;
848         ssize_t length = -EFAULT;
849         int new_value;
850
851         down(&sel_sem);
852
853         length = task_has_security(current, SECURITY__SETBOOL);
854         if (length)
855                 goto out;
856
857         /* check to see if this file has been deleted */
858         if (!filep->f_op)
859                 goto out;
860
861         if (count < 0 || count >= PAGE_SIZE) {
862                 length = -ENOMEM;
863                 goto out;
864         }
865         if (*ppos != 0) {
866                 /* No partial writes. */
867                 goto out;
868         }
869         page = (char*)get_zeroed_page(GFP_KERNEL);
870         if (!page) {
871                 length = -ENOMEM;
872                 goto out;
873         }
874
875         if (copy_from_user(page, buf, count))
876                 goto out;
877
878         length = -EINVAL;
879         if (sscanf(page, "%d", &new_value) != 1)
880                 goto out;
881
882         if (new_value) {
883                 security_set_bools(bool_num, bool_pending_values);
884         }
885
886         length = count;
887
888 out:
889         up(&sel_sem);
890         if (page)
891                 free_page((unsigned long) page);
892         return length;
893 }
894
895 static struct file_operations sel_commit_bools_ops = {
896         .write          = sel_commit_bools_write,
897 };
898
899 /* delete booleans - partial revoke() from
900  * fs/proc/generic.c proc_kill_inodes */
901 static void sel_remove_bools(struct dentry *de)
902 {
903         struct list_head *p, *node;
904         struct super_block *sb = de->d_sb;
905
906         spin_lock(&dcache_lock);
907         node = de->d_subdirs.next;
908         while (node != &de->d_subdirs) {
909                 struct dentry *d = list_entry(node, struct dentry, d_child);
910                 list_del_init(node);
911
912                 if (d->d_inode) {
913                         d = dget_locked(d);
914                         spin_unlock(&dcache_lock);
915                         d_delete(d);
916                         simple_unlink(de->d_inode, d);
917                         dput(d);
918                         spin_lock(&dcache_lock);
919                 }
920                 node = de->d_subdirs.next;
921         }
922
923         spin_unlock(&dcache_lock);
924
925         file_list_lock();
926         list_for_each(p, &sb->s_files) {
927                 struct file * filp = list_entry(p, struct file, f_list);
928                 struct dentry * dentry = filp->f_dentry;
929
930                 if (dentry->d_parent != de) {
931                         continue;
932                 }
933                 filp->f_op = NULL;
934         }
935         file_list_unlock();
936 }
937
938 #define BOOL_DIR_NAME "booleans"
939
940 static int sel_make_bools(void)
941 {
942         int i, ret = 0;
943         ssize_t len;
944         struct dentry *dentry = NULL;
945         struct dentry *dir = bool_dir;
946         struct inode *inode = NULL;
947         struct inode_security_struct *isec;
948         char **names = NULL, *page;
949         int num;
950         int *values = NULL;
951         u32 sid;
952
953         /* remove any existing files */
954         kfree(bool_pending_values);
955
956         sel_remove_bools(dir);
957
958         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
959                 return -ENOMEM;
960
961         ret = security_get_bools(&num, &names, &values);
962         if (ret != 0)
963                 goto out;
964
965         for (i = 0; i < num; i++) {
966                 dentry = d_alloc_name(dir, names[i]);
967                 if (!dentry) {
968                         ret = -ENOMEM;
969                         goto err;
970                 }
971                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
972                 if (!inode) {
973                         ret = -ENOMEM;
974                         goto err;
975                 }
976
977                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
978                 if (len < 0) {
979                         ret = -EINVAL;
980                         goto err;
981                 } else if (len >= PAGE_SIZE) {
982                         ret = -ENAMETOOLONG;
983                         goto err;
984                 }
985                 isec = (struct inode_security_struct*)inode->i_security;
986                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
987                         goto err;
988                 isec->sid = sid;
989                 isec->initialized = 1;
990                 inode->i_fop = &sel_bool_ops;
991                 inode->i_ino = i + BOOL_INO_OFFSET;
992                 d_add(dentry, inode);
993         }
994         bool_num = num;
995         bool_pending_values = values;
996 out:
997         free_page((unsigned long)page);
998         if (names) {
999                 for (i = 0; i < num; i++)
1000                         kfree(names[i]);
1001                 kfree(names);
1002         }
1003         return ret;
1004 err:
1005         d_genocide(dir);
1006         ret = -ENOMEM;
1007         goto out;
1008 }
1009
1010 #define NULL_FILE_NAME "null"
1011
1012 struct dentry *selinux_null = NULL;
1013
1014 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1015                                             size_t count, loff_t *ppos)
1016 {
1017         char tmpbuf[TMPBUFLEN];
1018         ssize_t length;
1019
1020         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1021         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1022 }
1023
1024 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1025                                              const char __user * buf,
1026                                              size_t count, loff_t *ppos)
1027
1028 {
1029         char *page;
1030         ssize_t ret;
1031         int new_value;
1032
1033         if (count < 0 || count >= PAGE_SIZE) {
1034                 ret = -ENOMEM;
1035                 goto out;
1036         }
1037
1038         if (*ppos != 0) {
1039                 /* No partial writes. */
1040                 ret = -EINVAL;
1041                 goto out;
1042         }
1043
1044         page = (char*)get_zeroed_page(GFP_KERNEL);
1045         if (!page) {
1046                 ret = -ENOMEM;
1047                 goto out;
1048         }
1049
1050         if (copy_from_user(page, buf, count)) {
1051                 ret = -EFAULT;
1052                 goto out_free;
1053         }
1054
1055         if (sscanf(page, "%u", &new_value) != 1) {
1056                 ret = -EINVAL;
1057                 goto out;
1058         }
1059
1060         if (new_value != avc_cache_threshold) {
1061                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1062                 if (ret)
1063                         goto out_free;
1064                 avc_cache_threshold = new_value;
1065         }
1066         ret = count;
1067 out_free:
1068         free_page((unsigned long)page);
1069 out:
1070         return ret;
1071 }
1072
1073 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1074                                        size_t count, loff_t *ppos)
1075 {
1076         char *page;
1077         ssize_t ret = 0;
1078
1079         page = (char *)__get_free_page(GFP_KERNEL);
1080         if (!page) {
1081                 ret = -ENOMEM;
1082                 goto out;
1083         }
1084         ret = avc_get_hash_stats(page);
1085         if (ret >= 0)
1086                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1087         free_page((unsigned long)page);
1088 out:
1089         return ret;
1090 }
1091
1092 static struct file_operations sel_avc_cache_threshold_ops = {
1093         .read           = sel_read_avc_cache_threshold,
1094         .write          = sel_write_avc_cache_threshold,
1095 };
1096
1097 static struct file_operations sel_avc_hash_stats_ops = {
1098         .read           = sel_read_avc_hash_stats,
1099 };
1100
1101 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1102 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1103 {
1104         int cpu;
1105
1106         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1107                 if (!cpu_possible(cpu))
1108                         continue;
1109                 *idx = cpu + 1;
1110                 return &per_cpu(avc_cache_stats, cpu);
1111         }
1112         return NULL;
1113 }
1114
1115 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1116 {
1117         loff_t n = *pos - 1;
1118
1119         if (*pos == 0)
1120                 return SEQ_START_TOKEN;
1121
1122         return sel_avc_get_stat_idx(&n);
1123 }
1124
1125 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1126 {
1127         return sel_avc_get_stat_idx(pos);
1128 }
1129
1130 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1131 {
1132         struct avc_cache_stats *st = v;
1133
1134         if (v == SEQ_START_TOKEN)
1135                 seq_printf(seq, "lookups hits misses allocations reclaims "
1136                            "frees\n");
1137         else
1138                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1139                            st->hits, st->misses, st->allocations,
1140                            st->reclaims, st->frees);
1141         return 0;
1142 }
1143
1144 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1145 { }
1146
1147 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1148         .start          = sel_avc_stats_seq_start,
1149         .next           = sel_avc_stats_seq_next,
1150         .show           = sel_avc_stats_seq_show,
1151         .stop           = sel_avc_stats_seq_stop,
1152 };
1153
1154 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1155 {
1156         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1157 }
1158
1159 static struct file_operations sel_avc_cache_stats_ops = {
1160         .open           = sel_open_avc_cache_stats,
1161         .read           = seq_read,
1162         .llseek         = seq_lseek,
1163         .release        = seq_release,
1164 };
1165 #endif
1166
1167 static int sel_make_avc_files(struct dentry *dir)
1168 {
1169         int i, ret = 0;
1170         static struct tree_descr files[] = {
1171                 { "cache_threshold",
1172                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1173                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1174 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1175                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1176 #endif
1177         };
1178
1179         for (i = 0; i < sizeof (files) / sizeof (files[0]); i++) {
1180                 struct inode *inode;
1181                 struct dentry *dentry;
1182
1183                 dentry = d_alloc_name(dir, files[i].name);
1184                 if (!dentry) {
1185                         ret = -ENOMEM;
1186                         goto err;
1187                 }
1188
1189                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1190                 if (!inode) {
1191                         ret = -ENOMEM;
1192                         goto err;
1193                 }
1194                 inode->i_fop = files[i].ops;
1195                 d_add(dentry, inode);
1196         }
1197 out:
1198         return ret;
1199 err:
1200         d_genocide(dir);
1201         goto out;
1202 }
1203
1204 static int sel_make_dir(struct super_block *sb, struct dentry *dentry)
1205 {
1206         int ret = 0;
1207         struct inode *inode;
1208
1209         inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
1210         if (!inode) {
1211                 ret = -ENOMEM;
1212                 goto out;
1213         }
1214         inode->i_op = &simple_dir_inode_operations;
1215         inode->i_fop = &simple_dir_operations;
1216         d_add(dentry, inode);
1217 out:
1218         return ret;
1219 }
1220
1221 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1222 {
1223         int ret;
1224         struct dentry *dentry;
1225         struct inode *inode;
1226         struct inode_security_struct *isec;
1227
1228         static struct tree_descr selinux_files[] = {
1229                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1230                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1231                 [SEL_CONTEXT] = {"context", &sel_context_ops, S_IRUGO|S_IWUGO},
1232                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1233                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1234                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1235                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1236                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1237                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1238                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1239                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1240                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1241                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1242                 /* last one */ {""}
1243         };
1244         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1245         if (ret)
1246                 return ret;
1247
1248         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1249         if (!dentry)
1250                 return -ENOMEM;
1251
1252         inode = sel_make_inode(sb, S_IFDIR | S_IRUGO | S_IXUGO);
1253         if (!inode)
1254                 goto out;
1255         inode->i_op = &simple_dir_inode_operations;
1256         inode->i_fop = &simple_dir_operations;
1257         d_add(dentry, inode);
1258         bool_dir = dentry;
1259         ret = sel_make_bools();
1260         if (ret)
1261                 goto out;
1262
1263         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1264         if (!dentry)
1265                 return -ENOMEM;
1266
1267         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1268         if (!inode)
1269                 goto out;
1270         isec = (struct inode_security_struct*)inode->i_security;
1271         isec->sid = SECINITSID_DEVNULL;
1272         isec->sclass = SECCLASS_CHR_FILE;
1273         isec->initialized = 1;
1274
1275         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1276         d_add(dentry, inode);
1277         selinux_null = dentry;
1278
1279         dentry = d_alloc_name(sb->s_root, "avc");
1280         if (!dentry)
1281                 return -ENOMEM;
1282
1283         ret = sel_make_dir(sb, dentry);
1284         if (ret)
1285                 goto out;
1286
1287         ret = sel_make_avc_files(dentry);
1288         if (ret)
1289                 goto out;
1290
1291         return 0;
1292 out:
1293         dput(dentry);
1294         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1295         return -ENOMEM;
1296 }
1297
1298 static struct super_block *sel_get_sb(struct file_system_type *fs_type,
1299                                       int flags, const char *dev_name, void *data)
1300 {
1301         return get_sb_single(fs_type, flags, data, sel_fill_super);
1302 }
1303
1304 static struct file_system_type sel_fs_type = {
1305         .name           = "selinuxfs",
1306         .get_sb         = sel_get_sb,
1307         .kill_sb        = kill_litter_super,
1308 };
1309
1310 struct vfsmount *selinuxfs_mount;
1311
1312 static int __init init_sel_fs(void)
1313 {
1314         int err;
1315
1316         if (!selinux_enabled)
1317                 return 0;
1318         err = register_filesystem(&sel_fs_type);
1319         if (!err) {
1320                 selinuxfs_mount = kern_mount(&sel_fs_type);
1321                 if (IS_ERR(selinuxfs_mount)) {
1322                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1323                         err = PTR_ERR(selinuxfs_mount);
1324                         selinuxfs_mount = NULL;
1325                 }
1326         }
1327         return err;
1328 }
1329
1330 __initcall(init_sel_fs);
1331
1332 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1333 void exit_sel_fs(void)
1334 {
1335         unregister_filesystem(&sel_fs_type);
1336 }
1337 #endif