2e73d3279f2dbd63d0e8a2e67a199410086353b3
[linux-2.6.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/mutex.h>
19 #include <linux/init.h>
20 #include <linux/string.h>
21 #include <linux/security.h>
22 #include <linux/major.h>
23 #include <linux/seq_file.h>
24 #include <linux/percpu.h>
25 #include <linux/audit.h>
26 #include <asm/uaccess.h>
27 #include <asm/semaphore.h>
28
29 /* selinuxfs pseudo filesystem for exporting the security policy API.
30    Based on the proc code and the fs/nfsd/nfsctl.c code. */
31
32 #include "flask.h"
33 #include "avc.h"
34 #include "avc_ss.h"
35 #include "security.h"
36 #include "objsec.h"
37 #include "conditional.h"
38
39 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
40
41 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
42 #define SELINUX_COMPAT_NET_VALUE 0
43 #else
44 #define SELINUX_COMPAT_NET_VALUE 1
45 #endif
46
47 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
48
49 static int __init checkreqprot_setup(char *str)
50 {
51         selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
52         return 1;
53 }
54 __setup("checkreqprot=", checkreqprot_setup);
55
56 static int __init selinux_compat_net_setup(char *str)
57 {
58         selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
59         return 1;
60 }
61 __setup("selinux_compat_net=", selinux_compat_net_setup);
62
63
64 static DEFINE_MUTEX(sel_mutex);
65
66 /* global data for booleans */
67 static struct dentry *bool_dir = NULL;
68 static int bool_num = 0;
69 static int *bool_pending_values = NULL;
70
71 extern void selnl_notify_setenforce(int val);
72
73 /* Check whether a task is allowed to use a security operation. */
74 static int task_has_security(struct task_struct *tsk,
75                              u32 perms)
76 {
77         struct task_security_struct *tsec;
78
79         tsec = tsk->security;
80         if (!tsec)
81                 return -EACCES;
82
83         return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
84                             SECCLASS_SECURITY, perms, NULL);
85 }
86
87 enum sel_inos {
88         SEL_ROOT_INO = 2,
89         SEL_LOAD,       /* load policy */
90         SEL_ENFORCE,    /* get or set enforcing status */
91         SEL_CONTEXT,    /* validate context */
92         SEL_ACCESS,     /* compute access decision */
93         SEL_CREATE,     /* compute create labeling decision */
94         SEL_RELABEL,    /* compute relabeling decision */
95         SEL_USER,       /* compute reachable user contexts */
96         SEL_POLICYVERS, /* return policy version for this kernel */
97         SEL_COMMIT_BOOLS, /* commit new boolean values */
98         SEL_MLS,        /* return if MLS policy is enabled */
99         SEL_DISABLE,    /* disable SELinux until next reboot */
100         SEL_AVC,        /* AVC management directory */
101         SEL_MEMBER,     /* compute polyinstantiation membership decision */
102         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
103         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
104 };
105
106 #define TMPBUFLEN       12
107 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
108                                 size_t count, loff_t *ppos)
109 {
110         char tmpbuf[TMPBUFLEN];
111         ssize_t length;
112
113         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
114         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
115 }
116
117 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
118 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
119                                  size_t count, loff_t *ppos)
120
121 {
122         char *page;
123         ssize_t length;
124         int new_value;
125
126         if (count >= PAGE_SIZE)
127                 return -ENOMEM;
128         if (*ppos != 0) {
129                 /* No partial writes. */
130                 return -EINVAL;
131         }
132         page = (char*)get_zeroed_page(GFP_KERNEL);
133         if (!page)
134                 return -ENOMEM;
135         length = -EFAULT;
136         if (copy_from_user(page, buf, count))
137                 goto out;
138
139         length = -EINVAL;
140         if (sscanf(page, "%d", &new_value) != 1)
141                 goto out;
142
143         if (new_value != selinux_enforcing) {
144                 length = task_has_security(current, SECURITY__SETENFORCE);
145                 if (length)
146                         goto out;
147                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
148                         "enforcing=%d old_enforcing=%d auid=%u", new_value, 
149                         selinux_enforcing,
150                         audit_get_loginuid(current->audit_context));
151                 selinux_enforcing = new_value;
152                 if (selinux_enforcing)
153                         avc_ss_reset(0);
154                 selnl_notify_setenforce(selinux_enforcing);
155         }
156         length = count;
157 out:
158         free_page((unsigned long) page);
159         return length;
160 }
161 #else
162 #define sel_write_enforce NULL
163 #endif
164
165 static struct file_operations sel_enforce_ops = {
166         .read           = sel_read_enforce,
167         .write          = sel_write_enforce,
168 };
169
170 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
171 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
172                                  size_t count, loff_t *ppos)
173
174 {
175         char *page;
176         ssize_t length;
177         int new_value;
178         extern int selinux_disable(void);
179
180         if (count >= PAGE_SIZE)
181                 return -ENOMEM;
182         if (*ppos != 0) {
183                 /* No partial writes. */
184                 return -EINVAL;
185         }
186         page = (char*)get_zeroed_page(GFP_KERNEL);
187         if (!page)
188                 return -ENOMEM;
189         length = -EFAULT;
190         if (copy_from_user(page, buf, count))
191                 goto out;
192
193         length = -EINVAL;
194         if (sscanf(page, "%d", &new_value) != 1)
195                 goto out;
196
197         if (new_value) {
198                 length = selinux_disable();
199                 if (length < 0)
200                         goto out;
201                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
202                         "selinux=0 auid=%u",
203                         audit_get_loginuid(current->audit_context));
204         }
205
206         length = count;
207 out:
208         free_page((unsigned long) page);
209         return length;
210 }
211 #else
212 #define sel_write_disable NULL
213 #endif
214
215 static struct file_operations sel_disable_ops = {
216         .write          = sel_write_disable,
217 };
218
219 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
220                                    size_t count, loff_t *ppos)
221 {
222         char tmpbuf[TMPBUFLEN];
223         ssize_t length;
224
225         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
226         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
227 }
228
229 static struct file_operations sel_policyvers_ops = {
230         .read           = sel_read_policyvers,
231 };
232
233 /* declaration for sel_write_load */
234 static int sel_make_bools(void);
235
236 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
237                                 size_t count, loff_t *ppos)
238 {
239         char tmpbuf[TMPBUFLEN];
240         ssize_t length;
241
242         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
243         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
244 }
245
246 static struct file_operations sel_mls_ops = {
247         .read           = sel_read_mls,
248 };
249
250 static ssize_t sel_write_load(struct file * file, const char __user * buf,
251                               size_t count, loff_t *ppos)
252
253 {
254         int ret;
255         ssize_t length;
256         void *data = NULL;
257
258         mutex_lock(&sel_mutex);
259
260         length = task_has_security(current, SECURITY__LOAD_POLICY);
261         if (length)
262                 goto out;
263
264         if (*ppos != 0) {
265                 /* No partial writes. */
266                 length = -EINVAL;
267                 goto out;
268         }
269
270         if ((count > 64 * 1024 * 1024)
271             || (data = vmalloc(count)) == NULL) {
272                 length = -ENOMEM;
273                 goto out;
274         }
275
276         length = -EFAULT;
277         if (copy_from_user(data, buf, count) != 0)
278                 goto out;
279
280         length = security_load_policy(data, count);
281         if (length)
282                 goto out;
283
284         ret = sel_make_bools();
285         if (ret)
286                 length = ret;
287         else
288                 length = count;
289         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
290                 "policy loaded auid=%u",
291                 audit_get_loginuid(current->audit_context));
292 out:
293         mutex_unlock(&sel_mutex);
294         vfree(data);
295         return length;
296 }
297
298 static struct file_operations sel_load_ops = {
299         .write          = sel_write_load,
300 };
301
302 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
303 {
304         char *canon;
305         u32 sid, len;
306         ssize_t length;
307
308         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
309         if (length)
310                 return length;
311
312         length = security_context_to_sid(buf, size, &sid);
313         if (length < 0)
314                 return length;
315
316         length = security_sid_to_context(sid, &canon, &len);
317         if (length < 0)
318                 return length;
319
320         if (len > SIMPLE_TRANSACTION_LIMIT) {
321                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
322                        "max\n", __FUNCTION__, len);
323                 length = -ERANGE;
324                 goto out;
325         }
326
327         memcpy(buf, canon, len);
328         length = len;
329 out:
330         kfree(canon);
331         return length;
332 }
333
334 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
335                                      size_t count, loff_t *ppos)
336 {
337         char tmpbuf[TMPBUFLEN];
338         ssize_t length;
339
340         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
341         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
342 }
343
344 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
345                                       size_t count, loff_t *ppos)
346 {
347         char *page;
348         ssize_t length;
349         unsigned int new_value;
350
351         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
352         if (length)
353                 return length;
354
355         if (count >= PAGE_SIZE)
356                 return -ENOMEM;
357         if (*ppos != 0) {
358                 /* No partial writes. */
359                 return -EINVAL;
360         }
361         page = (char*)get_zeroed_page(GFP_KERNEL);
362         if (!page)
363                 return -ENOMEM;
364         length = -EFAULT;
365         if (copy_from_user(page, buf, count))
366                 goto out;
367
368         length = -EINVAL;
369         if (sscanf(page, "%u", &new_value) != 1)
370                 goto out;
371
372         selinux_checkreqprot = new_value ? 1 : 0;
373         length = count;
374 out:
375         free_page((unsigned long) page);
376         return length;
377 }
378 static struct file_operations sel_checkreqprot_ops = {
379         .read           = sel_read_checkreqprot,
380         .write          = sel_write_checkreqprot,
381 };
382
383 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
384                                    size_t count, loff_t *ppos)
385 {
386         char tmpbuf[TMPBUFLEN];
387         ssize_t length;
388
389         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
390         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
391 }
392
393 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
394                                     size_t count, loff_t *ppos)
395 {
396         char *page;
397         ssize_t length;
398         int new_value;
399
400         length = task_has_security(current, SECURITY__LOAD_POLICY);
401         if (length)
402                 return length;
403
404         if (count >= PAGE_SIZE)
405                 return -ENOMEM;
406         if (*ppos != 0) {
407                 /* No partial writes. */
408                 return -EINVAL;
409         }
410         page = (char*)get_zeroed_page(GFP_KERNEL);
411         if (!page)
412                 return -ENOMEM;
413         length = -EFAULT;
414         if (copy_from_user(page, buf, count))
415                 goto out;
416
417         length = -EINVAL;
418         if (sscanf(page, "%d", &new_value) != 1)
419                 goto out;
420
421         selinux_compat_net = new_value ? 1 : 0;
422         length = count;
423 out:
424         free_page((unsigned long) page);
425         return length;
426 }
427 static struct file_operations sel_compat_net_ops = {
428         .read           = sel_read_compat_net,
429         .write          = sel_write_compat_net,
430 };
431
432 /*
433  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
434  */
435 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
436 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
437 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
438 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
439 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
440
441 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
442         [SEL_ACCESS] = sel_write_access,
443         [SEL_CREATE] = sel_write_create,
444         [SEL_RELABEL] = sel_write_relabel,
445         [SEL_USER] = sel_write_user,
446         [SEL_MEMBER] = sel_write_member,
447         [SEL_CONTEXT] = sel_write_context,
448 };
449
450 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
451 {
452         ino_t ino =  file->f_dentry->d_inode->i_ino;
453         char *data;
454         ssize_t rv;
455
456         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
457                 return -EINVAL;
458
459         data = simple_transaction_get(file, buf, size);
460         if (IS_ERR(data))
461                 return PTR_ERR(data);
462
463         rv =  write_op[ino](file, data, size);
464         if (rv>0) {
465                 simple_transaction_set(file, rv);
466                 rv = size;
467         }
468         return rv;
469 }
470
471 static struct file_operations transaction_ops = {
472         .write          = selinux_transaction_write,
473         .read           = simple_transaction_read,
474         .release        = simple_transaction_release,
475 };
476
477 /*
478  * payload - write methods
479  * If the method has a response, the response should be put in buf,
480  * and the length returned.  Otherwise return 0 or and -error.
481  */
482
483 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
484 {
485         char *scon, *tcon;
486         u32 ssid, tsid;
487         u16 tclass;
488         u32 req;
489         struct av_decision avd;
490         ssize_t length;
491
492         length = task_has_security(current, SECURITY__COMPUTE_AV);
493         if (length)
494                 return length;
495
496         length = -ENOMEM;
497         scon = kzalloc(size+1, GFP_KERNEL);
498         if (!scon)
499                 return length;
500
501         tcon = kzalloc(size+1, GFP_KERNEL);
502         if (!tcon)
503                 goto out;
504
505         length = -EINVAL;
506         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
507                 goto out2;
508
509         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
510         if (length < 0)
511                 goto out2;
512         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
513         if (length < 0)
514                 goto out2;
515
516         length = security_compute_av(ssid, tsid, tclass, req, &avd);
517         if (length < 0)
518                 goto out2;
519
520         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
521                           "%x %x %x %x %u",
522                           avd.allowed, avd.decided,
523                           avd.auditallow, avd.auditdeny,
524                           avd.seqno);
525 out2:
526         kfree(tcon);
527 out:
528         kfree(scon);
529         return length;
530 }
531
532 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
533 {
534         char *scon, *tcon;
535         u32 ssid, tsid, newsid;
536         u16 tclass;
537         ssize_t length;
538         char *newcon;
539         u32 len;
540
541         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
542         if (length)
543                 return length;
544
545         length = -ENOMEM;
546         scon = kzalloc(size+1, GFP_KERNEL);
547         if (!scon)
548                 return length;
549
550         tcon = kzalloc(size+1, GFP_KERNEL);
551         if (!tcon)
552                 goto out;
553
554         length = -EINVAL;
555         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
556                 goto out2;
557
558         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
559         if (length < 0)
560                 goto out2;
561         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
562         if (length < 0)
563                 goto out2;
564
565         length = security_transition_sid(ssid, tsid, tclass, &newsid);
566         if (length < 0)
567                 goto out2;
568
569         length = security_sid_to_context(newsid, &newcon, &len);
570         if (length < 0)
571                 goto out2;
572
573         if (len > SIMPLE_TRANSACTION_LIMIT) {
574                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
575                        "max\n", __FUNCTION__, len);
576                 length = -ERANGE;
577                 goto out3;
578         }
579
580         memcpy(buf, newcon, len);
581         length = len;
582 out3:
583         kfree(newcon);
584 out2:
585         kfree(tcon);
586 out:
587         kfree(scon);
588         return length;
589 }
590
591 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
592 {
593         char *scon, *tcon;
594         u32 ssid, tsid, newsid;
595         u16 tclass;
596         ssize_t length;
597         char *newcon;
598         u32 len;
599
600         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
601         if (length)
602                 return length;
603
604         length = -ENOMEM;
605         scon = kzalloc(size+1, GFP_KERNEL);
606         if (!scon)
607                 return length;
608
609         tcon = kzalloc(size+1, GFP_KERNEL);
610         if (!tcon)
611                 goto out;
612
613         length = -EINVAL;
614         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
615                 goto out2;
616
617         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
618         if (length < 0)
619                 goto out2;
620         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
621         if (length < 0)
622                 goto out2;
623
624         length = security_change_sid(ssid, tsid, tclass, &newsid);
625         if (length < 0)
626                 goto out2;
627
628         length = security_sid_to_context(newsid, &newcon, &len);
629         if (length < 0)
630                 goto out2;
631
632         if (len > SIMPLE_TRANSACTION_LIMIT) {
633                 length = -ERANGE;
634                 goto out3;
635         }
636
637         memcpy(buf, newcon, len);
638         length = len;
639 out3:
640         kfree(newcon);
641 out2:
642         kfree(tcon);
643 out:
644         kfree(scon);
645         return length;
646 }
647
648 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
649 {
650         char *con, *user, *ptr;
651         u32 sid, *sids;
652         ssize_t length;
653         char *newcon;
654         int i, rc;
655         u32 len, nsids;
656
657         length = task_has_security(current, SECURITY__COMPUTE_USER);
658         if (length)
659                 return length;
660
661         length = -ENOMEM;
662         con = kzalloc(size+1, GFP_KERNEL);
663         if (!con)
664                 return length;
665
666         user = kzalloc(size+1, GFP_KERNEL);
667         if (!user)
668                 goto out;
669
670         length = -EINVAL;
671         if (sscanf(buf, "%s %s", con, user) != 2)
672                 goto out2;
673
674         length = security_context_to_sid(con, strlen(con)+1, &sid);
675         if (length < 0)
676                 goto out2;
677
678         length = security_get_user_sids(sid, user, &sids, &nsids);
679         if (length < 0)
680                 goto out2;
681
682         length = sprintf(buf, "%u", nsids) + 1;
683         ptr = buf + length;
684         for (i = 0; i < nsids; i++) {
685                 rc = security_sid_to_context(sids[i], &newcon, &len);
686                 if (rc) {
687                         length = rc;
688                         goto out3;
689                 }
690                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
691                         kfree(newcon);
692                         length = -ERANGE;
693                         goto out3;
694                 }
695                 memcpy(ptr, newcon, len);
696                 kfree(newcon);
697                 ptr += len;
698                 length += len;
699         }
700 out3:
701         kfree(sids);
702 out2:
703         kfree(user);
704 out:
705         kfree(con);
706         return length;
707 }
708
709 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
710 {
711         char *scon, *tcon;
712         u32 ssid, tsid, newsid;
713         u16 tclass;
714         ssize_t length;
715         char *newcon;
716         u32 len;
717
718         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
719         if (length)
720                 return length;
721
722         length = -ENOMEM;
723         scon = kzalloc(size+1, GFP_KERNEL);
724         if (!scon)
725                 return length;
726
727         tcon = kzalloc(size+1, GFP_KERNEL);
728         if (!tcon)
729                 goto out;
730
731         length = -EINVAL;
732         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
733                 goto out2;
734
735         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
736         if (length < 0)
737                 goto out2;
738         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
739         if (length < 0)
740                 goto out2;
741
742         length = security_member_sid(ssid, tsid, tclass, &newsid);
743         if (length < 0)
744                 goto out2;
745
746         length = security_sid_to_context(newsid, &newcon, &len);
747         if (length < 0)
748                 goto out2;
749
750         if (len > SIMPLE_TRANSACTION_LIMIT) {
751                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
752                        "max\n", __FUNCTION__, len);
753                 length = -ERANGE;
754                 goto out3;
755         }
756
757         memcpy(buf, newcon, len);
758         length = len;
759 out3:
760         kfree(newcon);
761 out2:
762         kfree(tcon);
763 out:
764         kfree(scon);
765         return length;
766 }
767
768 static struct inode *sel_make_inode(struct super_block *sb, int mode)
769 {
770         struct inode *ret = new_inode(sb);
771
772         if (ret) {
773                 ret->i_mode = mode;
774                 ret->i_uid = ret->i_gid = 0;
775                 ret->i_blksize = PAGE_CACHE_SIZE;
776                 ret->i_blocks = 0;
777                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
778         }
779         return ret;
780 }
781
782 #define BOOL_INO_OFFSET 30
783
784 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
785                              size_t count, loff_t *ppos)
786 {
787         char *page = NULL;
788         ssize_t length;
789         ssize_t ret;
790         int cur_enforcing;
791         struct inode *inode;
792
793         mutex_lock(&sel_mutex);
794
795         ret = -EFAULT;
796
797         /* check to see if this file has been deleted */
798         if (!filep->f_op)
799                 goto out;
800
801         if (count > PAGE_SIZE) {
802                 ret = -EINVAL;
803                 goto out;
804         }
805         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
806                 ret = -ENOMEM;
807                 goto out;
808         }
809
810         inode = filep->f_dentry->d_inode;
811         cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
812         if (cur_enforcing < 0) {
813                 ret = cur_enforcing;
814                 goto out;
815         }
816
817         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
818                           bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
819         ret = simple_read_from_buffer(buf, count, ppos, page, length);
820 out:
821         mutex_unlock(&sel_mutex);
822         if (page)
823                 free_page((unsigned long)page);
824         return ret;
825 }
826
827 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
828                               size_t count, loff_t *ppos)
829 {
830         char *page = NULL;
831         ssize_t length = -EFAULT;
832         int new_value;
833         struct inode *inode;
834
835         mutex_lock(&sel_mutex);
836
837         length = task_has_security(current, SECURITY__SETBOOL);
838         if (length)
839                 goto out;
840
841         /* check to see if this file has been deleted */
842         if (!filep->f_op)
843                 goto out;
844
845         if (count >= PAGE_SIZE) {
846                 length = -ENOMEM;
847                 goto out;
848         }
849         if (*ppos != 0) {
850                 /* No partial writes. */
851                 goto out;
852         }
853         page = (char*)get_zeroed_page(GFP_KERNEL);
854         if (!page) {
855                 length = -ENOMEM;
856                 goto out;
857         }
858
859         if (copy_from_user(page, buf, count))
860                 goto out;
861
862         length = -EINVAL;
863         if (sscanf(page, "%d", &new_value) != 1)
864                 goto out;
865
866         if (new_value)
867                 new_value = 1;
868
869         inode = filep->f_dentry->d_inode;
870         bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
871         length = count;
872
873 out:
874         mutex_unlock(&sel_mutex);
875         if (page)
876                 free_page((unsigned long) page);
877         return length;
878 }
879
880 static struct file_operations sel_bool_ops = {
881         .read           = sel_read_bool,
882         .write          = sel_write_bool,
883 };
884
885 static ssize_t sel_commit_bools_write(struct file *filep,
886                                       const char __user *buf,
887                                       size_t count, loff_t *ppos)
888 {
889         char *page = NULL;
890         ssize_t length = -EFAULT;
891         int new_value;
892
893         mutex_lock(&sel_mutex);
894
895         length = task_has_security(current, SECURITY__SETBOOL);
896         if (length)
897                 goto out;
898
899         /* check to see if this file has been deleted */
900         if (!filep->f_op)
901                 goto out;
902
903         if (count >= PAGE_SIZE) {
904                 length = -ENOMEM;
905                 goto out;
906         }
907         if (*ppos != 0) {
908                 /* No partial writes. */
909                 goto out;
910         }
911         page = (char*)get_zeroed_page(GFP_KERNEL);
912         if (!page) {
913                 length = -ENOMEM;
914                 goto out;
915         }
916
917         if (copy_from_user(page, buf, count))
918                 goto out;
919
920         length = -EINVAL;
921         if (sscanf(page, "%d", &new_value) != 1)
922                 goto out;
923
924         if (new_value && bool_pending_values) {
925                 security_set_bools(bool_num, bool_pending_values);
926         }
927
928         length = count;
929
930 out:
931         mutex_unlock(&sel_mutex);
932         if (page)
933                 free_page((unsigned long) page);
934         return length;
935 }
936
937 static struct file_operations sel_commit_bools_ops = {
938         .write          = sel_commit_bools_write,
939 };
940
941 /* delete booleans - partial revoke() from
942  * fs/proc/generic.c proc_kill_inodes */
943 static void sel_remove_bools(struct dentry *de)
944 {
945         struct list_head *p, *node;
946         struct super_block *sb = de->d_sb;
947
948         spin_lock(&dcache_lock);
949         node = de->d_subdirs.next;
950         while (node != &de->d_subdirs) {
951                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
952                 list_del_init(node);
953
954                 if (d->d_inode) {
955                         d = dget_locked(d);
956                         spin_unlock(&dcache_lock);
957                         d_delete(d);
958                         simple_unlink(de->d_inode, d);
959                         dput(d);
960                         spin_lock(&dcache_lock);
961                 }
962                 node = de->d_subdirs.next;
963         }
964
965         spin_unlock(&dcache_lock);
966
967         file_list_lock();
968         list_for_each(p, &sb->s_files) {
969                 struct file * filp = list_entry(p, struct file, f_u.fu_list);
970                 struct dentry * dentry = filp->f_dentry;
971
972                 if (dentry->d_parent != de) {
973                         continue;
974                 }
975                 filp->f_op = NULL;
976         }
977         file_list_unlock();
978 }
979
980 #define BOOL_DIR_NAME "booleans"
981
982 static int sel_make_bools(void)
983 {
984         int i, ret = 0;
985         ssize_t len;
986         struct dentry *dentry = NULL;
987         struct dentry *dir = bool_dir;
988         struct inode *inode = NULL;
989         struct inode_security_struct *isec;
990         char **names = NULL, *page;
991         int num;
992         int *values = NULL;
993         u32 sid;
994
995         /* remove any existing files */
996         kfree(bool_pending_values);
997         bool_pending_values = NULL;
998
999         sel_remove_bools(dir);
1000
1001         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1002                 return -ENOMEM;
1003
1004         ret = security_get_bools(&num, &names, &values);
1005         if (ret != 0)
1006                 goto out;
1007
1008         for (i = 0; i < num; i++) {
1009                 dentry = d_alloc_name(dir, names[i]);
1010                 if (!dentry) {
1011                         ret = -ENOMEM;
1012                         goto err;
1013                 }
1014                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1015                 if (!inode) {
1016                         ret = -ENOMEM;
1017                         goto err;
1018                 }
1019
1020                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1021                 if (len < 0) {
1022                         ret = -EINVAL;
1023                         goto err;
1024                 } else if (len >= PAGE_SIZE) {
1025                         ret = -ENAMETOOLONG;
1026                         goto err;
1027                 }
1028                 isec = (struct inode_security_struct*)inode->i_security;
1029                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1030                         goto err;
1031                 isec->sid = sid;
1032                 isec->initialized = 1;
1033                 inode->i_fop = &sel_bool_ops;
1034                 inode->i_ino = i + BOOL_INO_OFFSET;
1035                 d_add(dentry, inode);
1036         }
1037         bool_num = num;
1038         bool_pending_values = values;
1039 out:
1040         free_page((unsigned long)page);
1041         if (names) {
1042                 for (i = 0; i < num; i++)
1043                         kfree(names[i]);
1044                 kfree(names);
1045         }
1046         return ret;
1047 err:
1048         kfree(values);
1049         sel_remove_bools(dir);
1050         ret = -ENOMEM;
1051         goto out;
1052 }
1053
1054 #define NULL_FILE_NAME "null"
1055
1056 struct dentry *selinux_null = NULL;
1057
1058 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1059                                             size_t count, loff_t *ppos)
1060 {
1061         char tmpbuf[TMPBUFLEN];
1062         ssize_t length;
1063
1064         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1065         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1066 }
1067
1068 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1069                                              const char __user * buf,
1070                                              size_t count, loff_t *ppos)
1071
1072 {
1073         char *page;
1074         ssize_t ret;
1075         int new_value;
1076
1077         if (count >= PAGE_SIZE) {
1078                 ret = -ENOMEM;
1079                 goto out;
1080         }
1081
1082         if (*ppos != 0) {
1083                 /* No partial writes. */
1084                 ret = -EINVAL;
1085                 goto out;
1086         }
1087
1088         page = (char*)get_zeroed_page(GFP_KERNEL);
1089         if (!page) {
1090                 ret = -ENOMEM;
1091                 goto out;
1092         }
1093
1094         if (copy_from_user(page, buf, count)) {
1095                 ret = -EFAULT;
1096                 goto out_free;
1097         }
1098
1099         if (sscanf(page, "%u", &new_value) != 1) {
1100                 ret = -EINVAL;
1101                 goto out;
1102         }
1103
1104         if (new_value != avc_cache_threshold) {
1105                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1106                 if (ret)
1107                         goto out_free;
1108                 avc_cache_threshold = new_value;
1109         }
1110         ret = count;
1111 out_free:
1112         free_page((unsigned long)page);
1113 out:
1114         return ret;
1115 }
1116
1117 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1118                                        size_t count, loff_t *ppos)
1119 {
1120         char *page;
1121         ssize_t ret = 0;
1122
1123         page = (char *)__get_free_page(GFP_KERNEL);
1124         if (!page) {
1125                 ret = -ENOMEM;
1126                 goto out;
1127         }
1128         ret = avc_get_hash_stats(page);
1129         if (ret >= 0)
1130                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1131         free_page((unsigned long)page);
1132 out:
1133         return ret;
1134 }
1135
1136 static struct file_operations sel_avc_cache_threshold_ops = {
1137         .read           = sel_read_avc_cache_threshold,
1138         .write          = sel_write_avc_cache_threshold,
1139 };
1140
1141 static struct file_operations sel_avc_hash_stats_ops = {
1142         .read           = sel_read_avc_hash_stats,
1143 };
1144
1145 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1146 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1147 {
1148         int cpu;
1149
1150         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1151                 if (!cpu_possible(cpu))
1152                         continue;
1153                 *idx = cpu + 1;
1154                 return &per_cpu(avc_cache_stats, cpu);
1155         }
1156         return NULL;
1157 }
1158
1159 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1160 {
1161         loff_t n = *pos - 1;
1162
1163         if (*pos == 0)
1164                 return SEQ_START_TOKEN;
1165
1166         return sel_avc_get_stat_idx(&n);
1167 }
1168
1169 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1170 {
1171         return sel_avc_get_stat_idx(pos);
1172 }
1173
1174 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1175 {
1176         struct avc_cache_stats *st = v;
1177
1178         if (v == SEQ_START_TOKEN)
1179                 seq_printf(seq, "lookups hits misses allocations reclaims "
1180                            "frees\n");
1181         else
1182                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1183                            st->hits, st->misses, st->allocations,
1184                            st->reclaims, st->frees);
1185         return 0;
1186 }
1187
1188 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1189 { }
1190
1191 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1192         .start          = sel_avc_stats_seq_start,
1193         .next           = sel_avc_stats_seq_next,
1194         .show           = sel_avc_stats_seq_show,
1195         .stop           = sel_avc_stats_seq_stop,
1196 };
1197
1198 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1199 {
1200         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1201 }
1202
1203 static struct file_operations sel_avc_cache_stats_ops = {
1204         .open           = sel_open_avc_cache_stats,
1205         .read           = seq_read,
1206         .llseek         = seq_lseek,
1207         .release        = seq_release,
1208 };
1209 #endif
1210
1211 static int sel_make_avc_files(struct dentry *dir)
1212 {
1213         int i, ret = 0;
1214         static struct tree_descr files[] = {
1215                 { "cache_threshold",
1216                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1217                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1218 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1219                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1220 #endif
1221         };
1222
1223         for (i = 0; i < ARRAY_SIZE(files); i++) {
1224                 struct inode *inode;
1225                 struct dentry *dentry;
1226
1227                 dentry = d_alloc_name(dir, files[i].name);
1228                 if (!dentry) {
1229                         ret = -ENOMEM;
1230                         goto out;
1231                 }
1232
1233                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1234                 if (!inode) {
1235                         ret = -ENOMEM;
1236                         goto out;
1237                 }
1238                 inode->i_fop = files[i].ops;
1239                 d_add(dentry, inode);
1240         }
1241 out:
1242         return ret;
1243 }
1244
1245 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1246 {
1247         int ret = 0;
1248         struct inode *inode;
1249
1250         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1251         if (!inode) {
1252                 ret = -ENOMEM;
1253                 goto out;
1254         }
1255         inode->i_op = &simple_dir_inode_operations;
1256         inode->i_fop = &simple_dir_operations;
1257         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1258         inode->i_nlink++;
1259         d_add(dentry, inode);
1260         /* bump link count on parent directory, too */
1261         dir->i_nlink++;
1262 out:
1263         return ret;
1264 }
1265
1266 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1267 {
1268         int ret;
1269         struct dentry *dentry;
1270         struct inode *inode, *root_inode;
1271         struct inode_security_struct *isec;
1272
1273         static struct tree_descr selinux_files[] = {
1274                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1275                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1276                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1277                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1278                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1279                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1280                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1281                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1282                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1283                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1284                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1285                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1286                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1287                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1288                 /* last one */ {""}
1289         };
1290         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1291         if (ret)
1292                 goto err;
1293
1294         root_inode = sb->s_root->d_inode;
1295
1296         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1297         if (!dentry) {
1298                 ret = -ENOMEM;
1299                 goto err;
1300         }
1301
1302         ret = sel_make_dir(root_inode, dentry);
1303         if (ret)
1304                 goto err;
1305
1306         bool_dir = dentry;
1307
1308         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1309         if (!dentry) {
1310                 ret = -ENOMEM;
1311                 goto err;
1312         }
1313
1314         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1315         if (!inode) {
1316                 ret = -ENOMEM;
1317                 goto err;
1318         }
1319         isec = (struct inode_security_struct*)inode->i_security;
1320         isec->sid = SECINITSID_DEVNULL;
1321         isec->sclass = SECCLASS_CHR_FILE;
1322         isec->initialized = 1;
1323
1324         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1325         d_add(dentry, inode);
1326         selinux_null = dentry;
1327
1328         dentry = d_alloc_name(sb->s_root, "avc");
1329         if (!dentry) {
1330                 ret = -ENOMEM;
1331                 goto err;
1332         }
1333
1334         ret = sel_make_dir(root_inode, dentry);
1335         if (ret)
1336                 goto err;
1337
1338         ret = sel_make_avc_files(dentry);
1339         if (ret)
1340                 goto err;
1341 out:
1342         return ret;
1343 err:
1344         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1345         goto out;
1346 }
1347
1348 static struct super_block *sel_get_sb(struct file_system_type *fs_type,
1349                                       int flags, const char *dev_name, void *data)
1350 {
1351         return get_sb_single(fs_type, flags, data, sel_fill_super);
1352 }
1353
1354 static struct file_system_type sel_fs_type = {
1355         .name           = "selinuxfs",
1356         .get_sb         = sel_get_sb,
1357         .kill_sb        = kill_litter_super,
1358 };
1359
1360 struct vfsmount *selinuxfs_mount;
1361
1362 static int __init init_sel_fs(void)
1363 {
1364         int err;
1365
1366         if (!selinux_enabled)
1367                 return 0;
1368         err = register_filesystem(&sel_fs_type);
1369         if (!err) {
1370                 selinuxfs_mount = kern_mount(&sel_fs_type);
1371                 if (IS_ERR(selinuxfs_mount)) {
1372                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1373                         err = PTR_ERR(selinuxfs_mount);
1374                         selinuxfs_mount = NULL;
1375                 }
1376         }
1377         return err;
1378 }
1379
1380 __initcall(init_sel_fs);
1381
1382 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1383 void exit_sel_fs(void)
1384 {
1385         unregister_filesystem(&sel_fs_type);
1386 }
1387 #endif