selinux: export initial SID contexts via selinuxfs
[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/kernel.h>
13 #include <linux/pagemap.h>
14 #include <linux/slab.h>
15 #include <linux/vmalloc.h>
16 #include <linux/fs.h>
17 #include <linux/mutex.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 <linux/audit.h>
25 #include <asm/uaccess.h>
26 #include <asm/semaphore.h>
27
28 /* selinuxfs pseudo filesystem for exporting the security policy API.
29    Based on the proc code and the fs/nfsd/nfsctl.c code. */
30
31 #include "flask.h"
32 #include "avc.h"
33 #include "avc_ss.h"
34 #include "security.h"
35 #include "objsec.h"
36 #include "conditional.h"
37
38 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
39
40 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
41 #define SELINUX_COMPAT_NET_VALUE 0
42 #else
43 #define SELINUX_COMPAT_NET_VALUE 1
44 #endif
45
46 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
47
48 static int __init checkreqprot_setup(char *str)
49 {
50         selinux_checkreqprot = simple_strtoul(str,NULL,0) ? 1 : 0;
51         return 1;
52 }
53 __setup("checkreqprot=", checkreqprot_setup);
54
55 static int __init selinux_compat_net_setup(char *str)
56 {
57         selinux_compat_net = simple_strtoul(str,NULL,0) ? 1 : 0;
58         return 1;
59 }
60 __setup("selinux_compat_net=", selinux_compat_net_setup);
61
62
63 static DEFINE_MUTEX(sel_mutex);
64
65 /* global data for booleans */
66 static struct dentry *bool_dir = NULL;
67 static int bool_num = 0;
68 static int *bool_pending_values = NULL;
69
70 extern void selnl_notify_setenforce(int val);
71
72 /* Check whether a task is allowed to use a security operation. */
73 static int task_has_security(struct task_struct *tsk,
74                              u32 perms)
75 {
76         struct task_security_struct *tsec;
77
78         tsec = tsk->security;
79         if (!tsec)
80                 return -EACCES;
81
82         return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
83                             SECCLASS_SECURITY, perms, NULL);
84 }
85
86 enum sel_inos {
87         SEL_ROOT_INO = 2,
88         SEL_LOAD,       /* load policy */
89         SEL_ENFORCE,    /* get or set enforcing status */
90         SEL_CONTEXT,    /* validate context */
91         SEL_ACCESS,     /* compute access decision */
92         SEL_CREATE,     /* compute create labeling decision */
93         SEL_RELABEL,    /* compute relabeling decision */
94         SEL_USER,       /* compute reachable user contexts */
95         SEL_POLICYVERS, /* return policy version for this kernel */
96         SEL_COMMIT_BOOLS, /* commit new boolean values */
97         SEL_MLS,        /* return if MLS policy is enabled */
98         SEL_DISABLE,    /* disable SELinux until next reboot */
99         SEL_AVC,        /* AVC management directory */
100         SEL_MEMBER,     /* compute polyinstantiation membership decision */
101         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
102         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
103 };
104
105 #define SEL_INITCON_INO_OFFSET  0x01000000
106 #define SEL_INO_MASK            0x00ffffff
107
108 #define TMPBUFLEN       12
109 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
110                                 size_t count, loff_t *ppos)
111 {
112         char tmpbuf[TMPBUFLEN];
113         ssize_t length;
114
115         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
116         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
117 }
118
119 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
120 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
121                                  size_t count, loff_t *ppos)
122
123 {
124         char *page;
125         ssize_t length;
126         int new_value;
127
128         if (count >= PAGE_SIZE)
129                 return -ENOMEM;
130         if (*ppos != 0) {
131                 /* No partial writes. */
132                 return -EINVAL;
133         }
134         page = (char*)get_zeroed_page(GFP_KERNEL);
135         if (!page)
136                 return -ENOMEM;
137         length = -EFAULT;
138         if (copy_from_user(page, buf, count))
139                 goto out;
140
141         length = -EINVAL;
142         if (sscanf(page, "%d", &new_value) != 1)
143                 goto out;
144
145         if (new_value != selinux_enforcing) {
146                 length = task_has_security(current, SECURITY__SETENFORCE);
147                 if (length)
148                         goto out;
149                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
150                         "enforcing=%d old_enforcing=%d auid=%u", new_value, 
151                         selinux_enforcing,
152                         audit_get_loginuid(current->audit_context));
153                 selinux_enforcing = new_value;
154                 if (selinux_enforcing)
155                         avc_ss_reset(0);
156                 selnl_notify_setenforce(selinux_enforcing);
157         }
158         length = count;
159 out:
160         free_page((unsigned long) page);
161         return length;
162 }
163 #else
164 #define sel_write_enforce NULL
165 #endif
166
167 static const struct file_operations sel_enforce_ops = {
168         .read           = sel_read_enforce,
169         .write          = sel_write_enforce,
170 };
171
172 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
173 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
174                                  size_t count, loff_t *ppos)
175
176 {
177         char *page;
178         ssize_t length;
179         int new_value;
180         extern int selinux_disable(void);
181
182         if (count >= PAGE_SIZE)
183                 return -ENOMEM;
184         if (*ppos != 0) {
185                 /* No partial writes. */
186                 return -EINVAL;
187         }
188         page = (char*)get_zeroed_page(GFP_KERNEL);
189         if (!page)
190                 return -ENOMEM;
191         length = -EFAULT;
192         if (copy_from_user(page, buf, count))
193                 goto out;
194
195         length = -EINVAL;
196         if (sscanf(page, "%d", &new_value) != 1)
197                 goto out;
198
199         if (new_value) {
200                 length = selinux_disable();
201                 if (length < 0)
202                         goto out;
203                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
204                         "selinux=0 auid=%u",
205                         audit_get_loginuid(current->audit_context));
206         }
207
208         length = count;
209 out:
210         free_page((unsigned long) page);
211         return length;
212 }
213 #else
214 #define sel_write_disable NULL
215 #endif
216
217 static const struct file_operations sel_disable_ops = {
218         .write          = sel_write_disable,
219 };
220
221 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
222                                    size_t count, loff_t *ppos)
223 {
224         char tmpbuf[TMPBUFLEN];
225         ssize_t length;
226
227         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
228         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
229 }
230
231 static const struct file_operations sel_policyvers_ops = {
232         .read           = sel_read_policyvers,
233 };
234
235 /* declaration for sel_write_load */
236 static int sel_make_bools(void);
237
238 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
239                                 size_t count, loff_t *ppos)
240 {
241         char tmpbuf[TMPBUFLEN];
242         ssize_t length;
243
244         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
245         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
246 }
247
248 static const struct file_operations sel_mls_ops = {
249         .read           = sel_read_mls,
250 };
251
252 static ssize_t sel_write_load(struct file * file, const char __user * buf,
253                               size_t count, loff_t *ppos)
254
255 {
256         int ret;
257         ssize_t length;
258         void *data = NULL;
259
260         mutex_lock(&sel_mutex);
261
262         length = task_has_security(current, SECURITY__LOAD_POLICY);
263         if (length)
264                 goto out;
265
266         if (*ppos != 0) {
267                 /* No partial writes. */
268                 length = -EINVAL;
269                 goto out;
270         }
271
272         if ((count > 64 * 1024 * 1024)
273             || (data = vmalloc(count)) == NULL) {
274                 length = -ENOMEM;
275                 goto out;
276         }
277
278         length = -EFAULT;
279         if (copy_from_user(data, buf, count) != 0)
280                 goto out;
281
282         length = security_load_policy(data, count);
283         if (length)
284                 goto out;
285
286         ret = sel_make_bools();
287         if (ret)
288                 length = ret;
289         else
290                 length = count;
291         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
292                 "policy loaded auid=%u",
293                 audit_get_loginuid(current->audit_context));
294 out:
295         mutex_unlock(&sel_mutex);
296         vfree(data);
297         return length;
298 }
299
300 static const struct file_operations sel_load_ops = {
301         .write          = sel_write_load,
302 };
303
304 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
305 {
306         char *canon;
307         u32 sid, len;
308         ssize_t length;
309
310         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
311         if (length)
312                 return length;
313
314         length = security_context_to_sid(buf, size, &sid);
315         if (length < 0)
316                 return length;
317
318         length = security_sid_to_context(sid, &canon, &len);
319         if (length < 0)
320                 return length;
321
322         if (len > SIMPLE_TRANSACTION_LIMIT) {
323                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
324                        "max\n", __FUNCTION__, len);
325                 length = -ERANGE;
326                 goto out;
327         }
328
329         memcpy(buf, canon, len);
330         length = len;
331 out:
332         kfree(canon);
333         return length;
334 }
335
336 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
337                                      size_t count, loff_t *ppos)
338 {
339         char tmpbuf[TMPBUFLEN];
340         ssize_t length;
341
342         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
343         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
344 }
345
346 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
347                                       size_t count, loff_t *ppos)
348 {
349         char *page;
350         ssize_t length;
351         unsigned int new_value;
352
353         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
354         if (length)
355                 return length;
356
357         if (count >= PAGE_SIZE)
358                 return -ENOMEM;
359         if (*ppos != 0) {
360                 /* No partial writes. */
361                 return -EINVAL;
362         }
363         page = (char*)get_zeroed_page(GFP_KERNEL);
364         if (!page)
365                 return -ENOMEM;
366         length = -EFAULT;
367         if (copy_from_user(page, buf, count))
368                 goto out;
369
370         length = -EINVAL;
371         if (sscanf(page, "%u", &new_value) != 1)
372                 goto out;
373
374         selinux_checkreqprot = new_value ? 1 : 0;
375         length = count;
376 out:
377         free_page((unsigned long) page);
378         return length;
379 }
380 static const struct file_operations sel_checkreqprot_ops = {
381         .read           = sel_read_checkreqprot,
382         .write          = sel_write_checkreqprot,
383 };
384
385 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
386                                    size_t count, loff_t *ppos)
387 {
388         char tmpbuf[TMPBUFLEN];
389         ssize_t length;
390
391         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
392         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
393 }
394
395 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
396                                     size_t count, loff_t *ppos)
397 {
398         char *page;
399         ssize_t length;
400         int new_value;
401
402         length = task_has_security(current, SECURITY__LOAD_POLICY);
403         if (length)
404                 return length;
405
406         if (count >= PAGE_SIZE)
407                 return -ENOMEM;
408         if (*ppos != 0) {
409                 /* No partial writes. */
410                 return -EINVAL;
411         }
412         page = (char*)get_zeroed_page(GFP_KERNEL);
413         if (!page)
414                 return -ENOMEM;
415         length = -EFAULT;
416         if (copy_from_user(page, buf, count))
417                 goto out;
418
419         length = -EINVAL;
420         if (sscanf(page, "%d", &new_value) != 1)
421                 goto out;
422
423         selinux_compat_net = new_value ? 1 : 0;
424         length = count;
425 out:
426         free_page((unsigned long) page);
427         return length;
428 }
429 static const struct file_operations sel_compat_net_ops = {
430         .read           = sel_read_compat_net,
431         .write          = sel_write_compat_net,
432 };
433
434 /*
435  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
436  */
437 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
438 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
439 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
440 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
441 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
442
443 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
444         [SEL_ACCESS] = sel_write_access,
445         [SEL_CREATE] = sel_write_create,
446         [SEL_RELABEL] = sel_write_relabel,
447         [SEL_USER] = sel_write_user,
448         [SEL_MEMBER] = sel_write_member,
449         [SEL_CONTEXT] = sel_write_context,
450 };
451
452 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
453 {
454         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
455         char *data;
456         ssize_t rv;
457
458         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
459                 return -EINVAL;
460
461         data = simple_transaction_get(file, buf, size);
462         if (IS_ERR(data))
463                 return PTR_ERR(data);
464
465         rv =  write_op[ino](file, data, size);
466         if (rv>0) {
467                 simple_transaction_set(file, rv);
468                 rv = size;
469         }
470         return rv;
471 }
472
473 static const struct file_operations transaction_ops = {
474         .write          = selinux_transaction_write,
475         .read           = simple_transaction_read,
476         .release        = simple_transaction_release,
477 };
478
479 /*
480  * payload - write methods
481  * If the method has a response, the response should be put in buf,
482  * and the length returned.  Otherwise return 0 or and -error.
483  */
484
485 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
486 {
487         char *scon, *tcon;
488         u32 ssid, tsid;
489         u16 tclass;
490         u32 req;
491         struct av_decision avd;
492         ssize_t length;
493
494         length = task_has_security(current, SECURITY__COMPUTE_AV);
495         if (length)
496                 return length;
497
498         length = -ENOMEM;
499         scon = kzalloc(size+1, GFP_KERNEL);
500         if (!scon)
501                 return length;
502
503         tcon = kzalloc(size+1, GFP_KERNEL);
504         if (!tcon)
505                 goto out;
506
507         length = -EINVAL;
508         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
509                 goto out2;
510
511         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
512         if (length < 0)
513                 goto out2;
514         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
515         if (length < 0)
516                 goto out2;
517
518         length = security_compute_av(ssid, tsid, tclass, req, &avd);
519         if (length < 0)
520                 goto out2;
521
522         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
523                           "%x %x %x %x %u",
524                           avd.allowed, avd.decided,
525                           avd.auditallow, avd.auditdeny,
526                           avd.seqno);
527 out2:
528         kfree(tcon);
529 out:
530         kfree(scon);
531         return length;
532 }
533
534 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
535 {
536         char *scon, *tcon;
537         u32 ssid, tsid, newsid;
538         u16 tclass;
539         ssize_t length;
540         char *newcon;
541         u32 len;
542
543         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
544         if (length)
545                 return length;
546
547         length = -ENOMEM;
548         scon = kzalloc(size+1, GFP_KERNEL);
549         if (!scon)
550                 return length;
551
552         tcon = kzalloc(size+1, GFP_KERNEL);
553         if (!tcon)
554                 goto out;
555
556         length = -EINVAL;
557         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
558                 goto out2;
559
560         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
561         if (length < 0)
562                 goto out2;
563         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
564         if (length < 0)
565                 goto out2;
566
567         length = security_transition_sid(ssid, tsid, tclass, &newsid);
568         if (length < 0)
569                 goto out2;
570
571         length = security_sid_to_context(newsid, &newcon, &len);
572         if (length < 0)
573                 goto out2;
574
575         if (len > SIMPLE_TRANSACTION_LIMIT) {
576                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
577                        "max\n", __FUNCTION__, len);
578                 length = -ERANGE;
579                 goto out3;
580         }
581
582         memcpy(buf, newcon, len);
583         length = len;
584 out3:
585         kfree(newcon);
586 out2:
587         kfree(tcon);
588 out:
589         kfree(scon);
590         return length;
591 }
592
593 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
594 {
595         char *scon, *tcon;
596         u32 ssid, tsid, newsid;
597         u16 tclass;
598         ssize_t length;
599         char *newcon;
600         u32 len;
601
602         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
603         if (length)
604                 return length;
605
606         length = -ENOMEM;
607         scon = kzalloc(size+1, GFP_KERNEL);
608         if (!scon)
609                 return length;
610
611         tcon = kzalloc(size+1, GFP_KERNEL);
612         if (!tcon)
613                 goto out;
614
615         length = -EINVAL;
616         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
617                 goto out2;
618
619         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
620         if (length < 0)
621                 goto out2;
622         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
623         if (length < 0)
624                 goto out2;
625
626         length = security_change_sid(ssid, tsid, tclass, &newsid);
627         if (length < 0)
628                 goto out2;
629
630         length = security_sid_to_context(newsid, &newcon, &len);
631         if (length < 0)
632                 goto out2;
633
634         if (len > SIMPLE_TRANSACTION_LIMIT) {
635                 length = -ERANGE;
636                 goto out3;
637         }
638
639         memcpy(buf, newcon, len);
640         length = len;
641 out3:
642         kfree(newcon);
643 out2:
644         kfree(tcon);
645 out:
646         kfree(scon);
647         return length;
648 }
649
650 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
651 {
652         char *con, *user, *ptr;
653         u32 sid, *sids;
654         ssize_t length;
655         char *newcon;
656         int i, rc;
657         u32 len, nsids;
658
659         length = task_has_security(current, SECURITY__COMPUTE_USER);
660         if (length)
661                 return length;
662
663         length = -ENOMEM;
664         con = kzalloc(size+1, GFP_KERNEL);
665         if (!con)
666                 return length;
667
668         user = kzalloc(size+1, GFP_KERNEL);
669         if (!user)
670                 goto out;
671
672         length = -EINVAL;
673         if (sscanf(buf, "%s %s", con, user) != 2)
674                 goto out2;
675
676         length = security_context_to_sid(con, strlen(con)+1, &sid);
677         if (length < 0)
678                 goto out2;
679
680         length = security_get_user_sids(sid, user, &sids, &nsids);
681         if (length < 0)
682                 goto out2;
683
684         length = sprintf(buf, "%u", nsids) + 1;
685         ptr = buf + length;
686         for (i = 0; i < nsids; i++) {
687                 rc = security_sid_to_context(sids[i], &newcon, &len);
688                 if (rc) {
689                         length = rc;
690                         goto out3;
691                 }
692                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
693                         kfree(newcon);
694                         length = -ERANGE;
695                         goto out3;
696                 }
697                 memcpy(ptr, newcon, len);
698                 kfree(newcon);
699                 ptr += len;
700                 length += len;
701         }
702 out3:
703         kfree(sids);
704 out2:
705         kfree(user);
706 out:
707         kfree(con);
708         return length;
709 }
710
711 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
712 {
713         char *scon, *tcon;
714         u32 ssid, tsid, newsid;
715         u16 tclass;
716         ssize_t length;
717         char *newcon;
718         u32 len;
719
720         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
721         if (length)
722                 return length;
723
724         length = -ENOMEM;
725         scon = kzalloc(size+1, GFP_KERNEL);
726         if (!scon)
727                 return length;
728
729         tcon = kzalloc(size+1, GFP_KERNEL);
730         if (!tcon)
731                 goto out;
732
733         length = -EINVAL;
734         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
735                 goto out2;
736
737         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
738         if (length < 0)
739                 goto out2;
740         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
741         if (length < 0)
742                 goto out2;
743
744         length = security_member_sid(ssid, tsid, tclass, &newsid);
745         if (length < 0)
746                 goto out2;
747
748         length = security_sid_to_context(newsid, &newcon, &len);
749         if (length < 0)
750                 goto out2;
751
752         if (len > SIMPLE_TRANSACTION_LIMIT) {
753                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
754                        "max\n", __FUNCTION__, len);
755                 length = -ERANGE;
756                 goto out3;
757         }
758
759         memcpy(buf, newcon, len);
760         length = len;
761 out3:
762         kfree(newcon);
763 out2:
764         kfree(tcon);
765 out:
766         kfree(scon);
767         return length;
768 }
769
770 static struct inode *sel_make_inode(struct super_block *sb, int mode)
771 {
772         struct inode *ret = new_inode(sb);
773
774         if (ret) {
775                 ret->i_mode = mode;
776                 ret->i_uid = ret->i_gid = 0;
777                 ret->i_blocks = 0;
778                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
779         }
780         return ret;
781 }
782
783 #define BOOL_INO_OFFSET 30
784
785 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
786                              size_t count, loff_t *ppos)
787 {
788         char *page = NULL;
789         ssize_t length;
790         ssize_t ret;
791         int cur_enforcing;
792         struct inode *inode;
793
794         mutex_lock(&sel_mutex);
795
796         ret = -EFAULT;
797
798         /* check to see if this file has been deleted */
799         if (!filep->f_op)
800                 goto out;
801
802         if (count > PAGE_SIZE) {
803                 ret = -EINVAL;
804                 goto out;
805         }
806         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
807                 ret = -ENOMEM;
808                 goto out;
809         }
810
811         inode = filep->f_path.dentry->d_inode;
812         cur_enforcing = security_get_bool_value(inode->i_ino - BOOL_INO_OFFSET);
813         if (cur_enforcing < 0) {
814                 ret = cur_enforcing;
815                 goto out;
816         }
817
818         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
819                           bool_pending_values[inode->i_ino - BOOL_INO_OFFSET]);
820         ret = simple_read_from_buffer(buf, count, ppos, page, length);
821 out:
822         mutex_unlock(&sel_mutex);
823         if (page)
824                 free_page((unsigned long)page);
825         return ret;
826 }
827
828 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
829                               size_t count, loff_t *ppos)
830 {
831         char *page = NULL;
832         ssize_t length = -EFAULT;
833         int new_value;
834         struct inode *inode;
835
836         mutex_lock(&sel_mutex);
837
838         length = task_has_security(current, SECURITY__SETBOOL);
839         if (length)
840                 goto out;
841
842         /* check to see if this file has been deleted */
843         if (!filep->f_op)
844                 goto out;
845
846         if (count >= PAGE_SIZE) {
847                 length = -ENOMEM;
848                 goto out;
849         }
850         if (*ppos != 0) {
851                 /* No partial writes. */
852                 goto out;
853         }
854         page = (char*)get_zeroed_page(GFP_KERNEL);
855         if (!page) {
856                 length = -ENOMEM;
857                 goto out;
858         }
859
860         if (copy_from_user(page, buf, count))
861                 goto out;
862
863         length = -EINVAL;
864         if (sscanf(page, "%d", &new_value) != 1)
865                 goto out;
866
867         if (new_value)
868                 new_value = 1;
869
870         inode = filep->f_path.dentry->d_inode;
871         bool_pending_values[inode->i_ino - BOOL_INO_OFFSET] = new_value;
872         length = count;
873
874 out:
875         mutex_unlock(&sel_mutex);
876         if (page)
877                 free_page((unsigned long) page);
878         return length;
879 }
880
881 static const struct file_operations sel_bool_ops = {
882         .read           = sel_read_bool,
883         .write          = sel_write_bool,
884 };
885
886 static ssize_t sel_commit_bools_write(struct file *filep,
887                                       const char __user *buf,
888                                       size_t count, loff_t *ppos)
889 {
890         char *page = NULL;
891         ssize_t length = -EFAULT;
892         int new_value;
893
894         mutex_lock(&sel_mutex);
895
896         length = task_has_security(current, SECURITY__SETBOOL);
897         if (length)
898                 goto out;
899
900         /* check to see if this file has been deleted */
901         if (!filep->f_op)
902                 goto out;
903
904         if (count >= PAGE_SIZE) {
905                 length = -ENOMEM;
906                 goto out;
907         }
908         if (*ppos != 0) {
909                 /* No partial writes. */
910                 goto out;
911         }
912         page = (char*)get_zeroed_page(GFP_KERNEL);
913         if (!page) {
914                 length = -ENOMEM;
915                 goto out;
916         }
917
918         if (copy_from_user(page, buf, count))
919                 goto out;
920
921         length = -EINVAL;
922         if (sscanf(page, "%d", &new_value) != 1)
923                 goto out;
924
925         if (new_value && bool_pending_values) {
926                 security_set_bools(bool_num, bool_pending_values);
927         }
928
929         length = count;
930
931 out:
932         mutex_unlock(&sel_mutex);
933         if (page)
934                 free_page((unsigned long) page);
935         return length;
936 }
937
938 static const struct file_operations sel_commit_bools_ops = {
939         .write          = sel_commit_bools_write,
940 };
941
942 /* delete booleans - partial revoke() from
943  * fs/proc/generic.c proc_kill_inodes */
944 static void sel_remove_bools(struct dentry *de)
945 {
946         struct list_head *p, *node;
947         struct super_block *sb = de->d_sb;
948
949         spin_lock(&dcache_lock);
950         node = de->d_subdirs.next;
951         while (node != &de->d_subdirs) {
952                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
953                 list_del_init(node);
954
955                 if (d->d_inode) {
956                         d = dget_locked(d);
957                         spin_unlock(&dcache_lock);
958                         d_delete(d);
959                         simple_unlink(de->d_inode, d);
960                         dput(d);
961                         spin_lock(&dcache_lock);
962                 }
963                 node = de->d_subdirs.next;
964         }
965
966         spin_unlock(&dcache_lock);
967
968         file_list_lock();
969         list_for_each(p, &sb->s_files) {
970                 struct file * filp = list_entry(p, struct file, f_u.fu_list);
971                 struct dentry * dentry = filp->f_path.dentry;
972
973                 if (dentry->d_parent != de) {
974                         continue;
975                 }
976                 filp->f_op = NULL;
977         }
978         file_list_unlock();
979 }
980
981 #define BOOL_DIR_NAME "booleans"
982
983 static int sel_make_bools(void)
984 {
985         int i, ret = 0;
986         ssize_t len;
987         struct dentry *dentry = NULL;
988         struct dentry *dir = bool_dir;
989         struct inode *inode = NULL;
990         struct inode_security_struct *isec;
991         char **names = NULL, *page;
992         int num;
993         int *values = NULL;
994         u32 sid;
995
996         /* remove any existing files */
997         kfree(bool_pending_values);
998         bool_pending_values = NULL;
999
1000         sel_remove_bools(dir);
1001
1002         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1003                 return -ENOMEM;
1004
1005         ret = security_get_bools(&num, &names, &values);
1006         if (ret != 0)
1007                 goto out;
1008
1009         for (i = 0; i < num; i++) {
1010                 dentry = d_alloc_name(dir, names[i]);
1011                 if (!dentry) {
1012                         ret = -ENOMEM;
1013                         goto err;
1014                 }
1015                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1016                 if (!inode) {
1017                         ret = -ENOMEM;
1018                         goto err;
1019                 }
1020
1021                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1022                 if (len < 0) {
1023                         ret = -EINVAL;
1024                         goto err;
1025                 } else if (len >= PAGE_SIZE) {
1026                         ret = -ENAMETOOLONG;
1027                         goto err;
1028                 }
1029                 isec = (struct inode_security_struct*)inode->i_security;
1030                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1031                         goto err;
1032                 isec->sid = sid;
1033                 isec->initialized = 1;
1034                 inode->i_fop = &sel_bool_ops;
1035                 inode->i_ino = i + BOOL_INO_OFFSET;
1036                 d_add(dentry, inode);
1037         }
1038         bool_num = num;
1039         bool_pending_values = values;
1040 out:
1041         free_page((unsigned long)page);
1042         if (names) {
1043                 for (i = 0; i < num; i++)
1044                         kfree(names[i]);
1045                 kfree(names);
1046         }
1047         return ret;
1048 err:
1049         kfree(values);
1050         sel_remove_bools(dir);
1051         ret = -ENOMEM;
1052         goto out;
1053 }
1054
1055 #define NULL_FILE_NAME "null"
1056
1057 struct dentry *selinux_null = NULL;
1058
1059 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1060                                             size_t count, loff_t *ppos)
1061 {
1062         char tmpbuf[TMPBUFLEN];
1063         ssize_t length;
1064
1065         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1066         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1067 }
1068
1069 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1070                                              const char __user * buf,
1071                                              size_t count, loff_t *ppos)
1072
1073 {
1074         char *page;
1075         ssize_t ret;
1076         int new_value;
1077
1078         if (count >= PAGE_SIZE) {
1079                 ret = -ENOMEM;
1080                 goto out;
1081         }
1082
1083         if (*ppos != 0) {
1084                 /* No partial writes. */
1085                 ret = -EINVAL;
1086                 goto out;
1087         }
1088
1089         page = (char*)get_zeroed_page(GFP_KERNEL);
1090         if (!page) {
1091                 ret = -ENOMEM;
1092                 goto out;
1093         }
1094
1095         if (copy_from_user(page, buf, count)) {
1096                 ret = -EFAULT;
1097                 goto out_free;
1098         }
1099
1100         if (sscanf(page, "%u", &new_value) != 1) {
1101                 ret = -EINVAL;
1102                 goto out;
1103         }
1104
1105         if (new_value != avc_cache_threshold) {
1106                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1107                 if (ret)
1108                         goto out_free;
1109                 avc_cache_threshold = new_value;
1110         }
1111         ret = count;
1112 out_free:
1113         free_page((unsigned long)page);
1114 out:
1115         return ret;
1116 }
1117
1118 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1119                                        size_t count, loff_t *ppos)
1120 {
1121         char *page;
1122         ssize_t ret = 0;
1123
1124         page = (char *)__get_free_page(GFP_KERNEL);
1125         if (!page) {
1126                 ret = -ENOMEM;
1127                 goto out;
1128         }
1129         ret = avc_get_hash_stats(page);
1130         if (ret >= 0)
1131                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1132         free_page((unsigned long)page);
1133 out:
1134         return ret;
1135 }
1136
1137 static const struct file_operations sel_avc_cache_threshold_ops = {
1138         .read           = sel_read_avc_cache_threshold,
1139         .write          = sel_write_avc_cache_threshold,
1140 };
1141
1142 static const struct file_operations sel_avc_hash_stats_ops = {
1143         .read           = sel_read_avc_hash_stats,
1144 };
1145
1146 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1147 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1148 {
1149         int cpu;
1150
1151         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1152                 if (!cpu_possible(cpu))
1153                         continue;
1154                 *idx = cpu + 1;
1155                 return &per_cpu(avc_cache_stats, cpu);
1156         }
1157         return NULL;
1158 }
1159
1160 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1161 {
1162         loff_t n = *pos - 1;
1163
1164         if (*pos == 0)
1165                 return SEQ_START_TOKEN;
1166
1167         return sel_avc_get_stat_idx(&n);
1168 }
1169
1170 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1171 {
1172         return sel_avc_get_stat_idx(pos);
1173 }
1174
1175 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1176 {
1177         struct avc_cache_stats *st = v;
1178
1179         if (v == SEQ_START_TOKEN)
1180                 seq_printf(seq, "lookups hits misses allocations reclaims "
1181                            "frees\n");
1182         else
1183                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1184                            st->hits, st->misses, st->allocations,
1185                            st->reclaims, st->frees);
1186         return 0;
1187 }
1188
1189 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1190 { }
1191
1192 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1193         .start          = sel_avc_stats_seq_start,
1194         .next           = sel_avc_stats_seq_next,
1195         .show           = sel_avc_stats_seq_show,
1196         .stop           = sel_avc_stats_seq_stop,
1197 };
1198
1199 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1200 {
1201         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1202 }
1203
1204 static const struct file_operations sel_avc_cache_stats_ops = {
1205         .open           = sel_open_avc_cache_stats,
1206         .read           = seq_read,
1207         .llseek         = seq_lseek,
1208         .release        = seq_release,
1209 };
1210 #endif
1211
1212 static int sel_make_avc_files(struct dentry *dir)
1213 {
1214         int i, ret = 0;
1215         static struct tree_descr files[] = {
1216                 { "cache_threshold",
1217                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1218                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1219 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1220                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1221 #endif
1222         };
1223
1224         for (i = 0; i < ARRAY_SIZE(files); i++) {
1225                 struct inode *inode;
1226                 struct dentry *dentry;
1227
1228                 dentry = d_alloc_name(dir, files[i].name);
1229                 if (!dentry) {
1230                         ret = -ENOMEM;
1231                         goto out;
1232                 }
1233
1234                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1235                 if (!inode) {
1236                         ret = -ENOMEM;
1237                         goto out;
1238                 }
1239                 inode->i_fop = files[i].ops;
1240                 d_add(dentry, inode);
1241         }
1242 out:
1243         return ret;
1244 }
1245
1246 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1247                                 size_t count, loff_t *ppos)
1248 {
1249         struct inode *inode;
1250         char *con;
1251         u32 sid, len;
1252         ssize_t ret;
1253
1254         inode = file->f_path.dentry->d_inode;
1255         sid = inode->i_ino&SEL_INO_MASK;
1256         ret = security_sid_to_context(sid, &con, &len);
1257         if (ret < 0)
1258                 return ret;
1259
1260         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1261         kfree(con);
1262         return ret;
1263 }
1264
1265 static const struct file_operations sel_initcon_ops = {
1266         .read           = sel_read_initcon,
1267 };
1268
1269 static int sel_make_initcon_files(struct dentry *dir)
1270 {
1271         int i, ret = 0;
1272
1273         for (i = 1; i <= SECINITSID_NUM; i++) {
1274                 struct inode *inode;
1275                 struct dentry *dentry;
1276                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1277                 if (!dentry) {
1278                         ret = -ENOMEM;
1279                         goto out;
1280                 }
1281
1282                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1283                 if (!inode) {
1284                         ret = -ENOMEM;
1285                         goto out;
1286                 }
1287                 inode->i_fop = &sel_initcon_ops;
1288                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1289                 d_add(dentry, inode);
1290         }
1291 out:
1292         return ret;
1293 }
1294
1295 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1296 {
1297         int ret = 0;
1298         struct inode *inode;
1299
1300         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1301         if (!inode) {
1302                 ret = -ENOMEM;
1303                 goto out;
1304         }
1305         inode->i_op = &simple_dir_inode_operations;
1306         inode->i_fop = &simple_dir_operations;
1307         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1308         inc_nlink(inode);
1309         d_add(dentry, inode);
1310         /* bump link count on parent directory, too */
1311         inc_nlink(dir);
1312 out:
1313         return ret;
1314 }
1315
1316 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1317 {
1318         int ret;
1319         struct dentry *dentry;
1320         struct inode *inode, *root_inode;
1321         struct inode_security_struct *isec;
1322
1323         static struct tree_descr selinux_files[] = {
1324                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1325                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1326                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1327                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1328                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1329                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1330                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1331                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1332                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1333                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1334                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1335                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1336                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1337                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1338                 /* last one */ {""}
1339         };
1340         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1341         if (ret)
1342                 goto err;
1343
1344         root_inode = sb->s_root->d_inode;
1345
1346         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1347         if (!dentry) {
1348                 ret = -ENOMEM;
1349                 goto err;
1350         }
1351
1352         ret = sel_make_dir(root_inode, dentry);
1353         if (ret)
1354                 goto err;
1355
1356         bool_dir = dentry;
1357
1358         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1359         if (!dentry) {
1360                 ret = -ENOMEM;
1361                 goto err;
1362         }
1363
1364         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1365         if (!inode) {
1366                 ret = -ENOMEM;
1367                 goto err;
1368         }
1369         isec = (struct inode_security_struct*)inode->i_security;
1370         isec->sid = SECINITSID_DEVNULL;
1371         isec->sclass = SECCLASS_CHR_FILE;
1372         isec->initialized = 1;
1373
1374         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1375         d_add(dentry, inode);
1376         selinux_null = dentry;
1377
1378         dentry = d_alloc_name(sb->s_root, "avc");
1379         if (!dentry) {
1380                 ret = -ENOMEM;
1381                 goto err;
1382         }
1383
1384         ret = sel_make_dir(root_inode, dentry);
1385         if (ret)
1386                 goto err;
1387
1388         ret = sel_make_avc_files(dentry);
1389         if (ret)
1390                 goto err;
1391
1392         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1393         if (!dentry) {
1394                 ret = -ENOMEM;
1395                 goto err;
1396         }
1397
1398         ret = sel_make_dir(root_inode, dentry);
1399         if (ret)
1400                 goto err;
1401
1402         ret = sel_make_initcon_files(dentry);
1403         if (ret)
1404                 goto err;
1405
1406 out:
1407         return ret;
1408 err:
1409         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1410         goto out;
1411 }
1412
1413 static int sel_get_sb(struct file_system_type *fs_type,
1414                       int flags, const char *dev_name, void *data,
1415                       struct vfsmount *mnt)
1416 {
1417         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1418 }
1419
1420 static struct file_system_type sel_fs_type = {
1421         .name           = "selinuxfs",
1422         .get_sb         = sel_get_sb,
1423         .kill_sb        = kill_litter_super,
1424 };
1425
1426 struct vfsmount *selinuxfs_mount;
1427
1428 static int __init init_sel_fs(void)
1429 {
1430         int err;
1431
1432         if (!selinux_enabled)
1433                 return 0;
1434         err = register_filesystem(&sel_fs_type);
1435         if (!err) {
1436                 selinuxfs_mount = kern_mount(&sel_fs_type);
1437                 if (IS_ERR(selinuxfs_mount)) {
1438                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1439                         err = PTR_ERR(selinuxfs_mount);
1440                         selinuxfs_mount = NULL;
1441                 }
1442         }
1443         return err;
1444 }
1445
1446 __initcall(init_sel_fs);
1447
1448 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1449 void exit_sel_fs(void)
1450 {
1451         unregister_filesystem(&sel_fs_type);
1452 }
1453 #endif