selinux: change numbering of boolean directory inodes in 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_MEMBER,     /* compute polyinstantiation membership decision */
100         SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
101         SEL_COMPAT_NET, /* whether to use old compat network packet controls */
102         SEL_INO_NEXT,   /* The next inode number to use */
103 };
104
105 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
106
107 #define SEL_INITCON_INO_OFFSET  0x01000000
108 #define SEL_BOOL_INO_OFFSET     0x02000000
109 #define SEL_INO_MASK            0x00ffffff
110
111 #define TMPBUFLEN       12
112 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
113                                 size_t count, loff_t *ppos)
114 {
115         char tmpbuf[TMPBUFLEN];
116         ssize_t length;
117
118         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
119         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
120 }
121
122 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
123 static ssize_t sel_write_enforce(struct file * file, const char __user * buf,
124                                  size_t count, loff_t *ppos)
125
126 {
127         char *page;
128         ssize_t length;
129         int new_value;
130
131         if (count >= PAGE_SIZE)
132                 return -ENOMEM;
133         if (*ppos != 0) {
134                 /* No partial writes. */
135                 return -EINVAL;
136         }
137         page = (char*)get_zeroed_page(GFP_KERNEL);
138         if (!page)
139                 return -ENOMEM;
140         length = -EFAULT;
141         if (copy_from_user(page, buf, count))
142                 goto out;
143
144         length = -EINVAL;
145         if (sscanf(page, "%d", &new_value) != 1)
146                 goto out;
147
148         if (new_value != selinux_enforcing) {
149                 length = task_has_security(current, SECURITY__SETENFORCE);
150                 if (length)
151                         goto out;
152                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
153                         "enforcing=%d old_enforcing=%d auid=%u", new_value, 
154                         selinux_enforcing,
155                         audit_get_loginuid(current->audit_context));
156                 selinux_enforcing = new_value;
157                 if (selinux_enforcing)
158                         avc_ss_reset(0);
159                 selnl_notify_setenforce(selinux_enforcing);
160         }
161         length = count;
162 out:
163         free_page((unsigned long) page);
164         return length;
165 }
166 #else
167 #define sel_write_enforce NULL
168 #endif
169
170 static const struct file_operations sel_enforce_ops = {
171         .read           = sel_read_enforce,
172         .write          = sel_write_enforce,
173 };
174
175 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
176 static ssize_t sel_write_disable(struct file * file, const char __user * buf,
177                                  size_t count, loff_t *ppos)
178
179 {
180         char *page;
181         ssize_t length;
182         int new_value;
183         extern int selinux_disable(void);
184
185         if (count >= PAGE_SIZE)
186                 return -ENOMEM;
187         if (*ppos != 0) {
188                 /* No partial writes. */
189                 return -EINVAL;
190         }
191         page = (char*)get_zeroed_page(GFP_KERNEL);
192         if (!page)
193                 return -ENOMEM;
194         length = -EFAULT;
195         if (copy_from_user(page, buf, count))
196                 goto out;
197
198         length = -EINVAL;
199         if (sscanf(page, "%d", &new_value) != 1)
200                 goto out;
201
202         if (new_value) {
203                 length = selinux_disable();
204                 if (length < 0)
205                         goto out;
206                 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
207                         "selinux=0 auid=%u",
208                         audit_get_loginuid(current->audit_context));
209         }
210
211         length = count;
212 out:
213         free_page((unsigned long) page);
214         return length;
215 }
216 #else
217 #define sel_write_disable NULL
218 #endif
219
220 static const struct file_operations sel_disable_ops = {
221         .write          = sel_write_disable,
222 };
223
224 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
225                                    size_t count, loff_t *ppos)
226 {
227         char tmpbuf[TMPBUFLEN];
228         ssize_t length;
229
230         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
231         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
232 }
233
234 static const struct file_operations sel_policyvers_ops = {
235         .read           = sel_read_policyvers,
236 };
237
238 /* declaration for sel_write_load */
239 static int sel_make_bools(void);
240
241 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
242                                 size_t count, loff_t *ppos)
243 {
244         char tmpbuf[TMPBUFLEN];
245         ssize_t length;
246
247         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
248         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
249 }
250
251 static const struct file_operations sel_mls_ops = {
252         .read           = sel_read_mls,
253 };
254
255 static ssize_t sel_write_load(struct file * file, const char __user * buf,
256                               size_t count, loff_t *ppos)
257
258 {
259         int ret;
260         ssize_t length;
261         void *data = NULL;
262
263         mutex_lock(&sel_mutex);
264
265         length = task_has_security(current, SECURITY__LOAD_POLICY);
266         if (length)
267                 goto out;
268
269         if (*ppos != 0) {
270                 /* No partial writes. */
271                 length = -EINVAL;
272                 goto out;
273         }
274
275         if ((count > 64 * 1024 * 1024)
276             || (data = vmalloc(count)) == NULL) {
277                 length = -ENOMEM;
278                 goto out;
279         }
280
281         length = -EFAULT;
282         if (copy_from_user(data, buf, count) != 0)
283                 goto out;
284
285         length = security_load_policy(data, count);
286         if (length)
287                 goto out;
288
289         ret = sel_make_bools();
290         if (ret)
291                 length = ret;
292         else
293                 length = count;
294         audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
295                 "policy loaded auid=%u",
296                 audit_get_loginuid(current->audit_context));
297 out:
298         mutex_unlock(&sel_mutex);
299         vfree(data);
300         return length;
301 }
302
303 static const struct file_operations sel_load_ops = {
304         .write          = sel_write_load,
305 };
306
307 static ssize_t sel_write_context(struct file * file, char *buf, size_t size)
308 {
309         char *canon;
310         u32 sid, len;
311         ssize_t length;
312
313         length = task_has_security(current, SECURITY__CHECK_CONTEXT);
314         if (length)
315                 return length;
316
317         length = security_context_to_sid(buf, size, &sid);
318         if (length < 0)
319                 return length;
320
321         length = security_sid_to_context(sid, &canon, &len);
322         if (length < 0)
323                 return length;
324
325         if (len > SIMPLE_TRANSACTION_LIMIT) {
326                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
327                        "max\n", __FUNCTION__, len);
328                 length = -ERANGE;
329                 goto out;
330         }
331
332         memcpy(buf, canon, len);
333         length = len;
334 out:
335         kfree(canon);
336         return length;
337 }
338
339 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
340                                      size_t count, loff_t *ppos)
341 {
342         char tmpbuf[TMPBUFLEN];
343         ssize_t length;
344
345         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
346         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
347 }
348
349 static ssize_t sel_write_checkreqprot(struct file * file, const char __user * buf,
350                                       size_t count, loff_t *ppos)
351 {
352         char *page;
353         ssize_t length;
354         unsigned int new_value;
355
356         length = task_has_security(current, SECURITY__SETCHECKREQPROT);
357         if (length)
358                 return length;
359
360         if (count >= PAGE_SIZE)
361                 return -ENOMEM;
362         if (*ppos != 0) {
363                 /* No partial writes. */
364                 return -EINVAL;
365         }
366         page = (char*)get_zeroed_page(GFP_KERNEL);
367         if (!page)
368                 return -ENOMEM;
369         length = -EFAULT;
370         if (copy_from_user(page, buf, count))
371                 goto out;
372
373         length = -EINVAL;
374         if (sscanf(page, "%u", &new_value) != 1)
375                 goto out;
376
377         selinux_checkreqprot = new_value ? 1 : 0;
378         length = count;
379 out:
380         free_page((unsigned long) page);
381         return length;
382 }
383 static const struct file_operations sel_checkreqprot_ops = {
384         .read           = sel_read_checkreqprot,
385         .write          = sel_write_checkreqprot,
386 };
387
388 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
389                                    size_t count, loff_t *ppos)
390 {
391         char tmpbuf[TMPBUFLEN];
392         ssize_t length;
393
394         length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
395         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
396 }
397
398 static ssize_t sel_write_compat_net(struct file * file, const char __user * buf,
399                                     size_t count, loff_t *ppos)
400 {
401         char *page;
402         ssize_t length;
403         int new_value;
404
405         length = task_has_security(current, SECURITY__LOAD_POLICY);
406         if (length)
407                 return length;
408
409         if (count >= PAGE_SIZE)
410                 return -ENOMEM;
411         if (*ppos != 0) {
412                 /* No partial writes. */
413                 return -EINVAL;
414         }
415         page = (char*)get_zeroed_page(GFP_KERNEL);
416         if (!page)
417                 return -ENOMEM;
418         length = -EFAULT;
419         if (copy_from_user(page, buf, count))
420                 goto out;
421
422         length = -EINVAL;
423         if (sscanf(page, "%d", &new_value) != 1)
424                 goto out;
425
426         selinux_compat_net = new_value ? 1 : 0;
427         length = count;
428 out:
429         free_page((unsigned long) page);
430         return length;
431 }
432 static const struct file_operations sel_compat_net_ops = {
433         .read           = sel_read_compat_net,
434         .write          = sel_write_compat_net,
435 };
436
437 /*
438  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
439  */
440 static ssize_t sel_write_access(struct file * file, char *buf, size_t size);
441 static ssize_t sel_write_create(struct file * file, char *buf, size_t size);
442 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size);
443 static ssize_t sel_write_user(struct file * file, char *buf, size_t size);
444 static ssize_t sel_write_member(struct file * file, char *buf, size_t size);
445
446 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
447         [SEL_ACCESS] = sel_write_access,
448         [SEL_CREATE] = sel_write_create,
449         [SEL_RELABEL] = sel_write_relabel,
450         [SEL_USER] = sel_write_user,
451         [SEL_MEMBER] = sel_write_member,
452         [SEL_CONTEXT] = sel_write_context,
453 };
454
455 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
456 {
457         ino_t ino =  file->f_path.dentry->d_inode->i_ino;
458         char *data;
459         ssize_t rv;
460
461         if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
462                 return -EINVAL;
463
464         data = simple_transaction_get(file, buf, size);
465         if (IS_ERR(data))
466                 return PTR_ERR(data);
467
468         rv =  write_op[ino](file, data, size);
469         if (rv>0) {
470                 simple_transaction_set(file, rv);
471                 rv = size;
472         }
473         return rv;
474 }
475
476 static const struct file_operations transaction_ops = {
477         .write          = selinux_transaction_write,
478         .read           = simple_transaction_read,
479         .release        = simple_transaction_release,
480 };
481
482 /*
483  * payload - write methods
484  * If the method has a response, the response should be put in buf,
485  * and the length returned.  Otherwise return 0 or and -error.
486  */
487
488 static ssize_t sel_write_access(struct file * file, char *buf, size_t size)
489 {
490         char *scon, *tcon;
491         u32 ssid, tsid;
492         u16 tclass;
493         u32 req;
494         struct av_decision avd;
495         ssize_t length;
496
497         length = task_has_security(current, SECURITY__COMPUTE_AV);
498         if (length)
499                 return length;
500
501         length = -ENOMEM;
502         scon = kzalloc(size+1, GFP_KERNEL);
503         if (!scon)
504                 return length;
505
506         tcon = kzalloc(size+1, GFP_KERNEL);
507         if (!tcon)
508                 goto out;
509
510         length = -EINVAL;
511         if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
512                 goto out2;
513
514         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
515         if (length < 0)
516                 goto out2;
517         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
518         if (length < 0)
519                 goto out2;
520
521         length = security_compute_av(ssid, tsid, tclass, req, &avd);
522         if (length < 0)
523                 goto out2;
524
525         length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
526                           "%x %x %x %x %u",
527                           avd.allowed, avd.decided,
528                           avd.auditallow, avd.auditdeny,
529                           avd.seqno);
530 out2:
531         kfree(tcon);
532 out:
533         kfree(scon);
534         return length;
535 }
536
537 static ssize_t sel_write_create(struct file * file, char *buf, size_t size)
538 {
539         char *scon, *tcon;
540         u32 ssid, tsid, newsid;
541         u16 tclass;
542         ssize_t length;
543         char *newcon;
544         u32 len;
545
546         length = task_has_security(current, SECURITY__COMPUTE_CREATE);
547         if (length)
548                 return length;
549
550         length = -ENOMEM;
551         scon = kzalloc(size+1, GFP_KERNEL);
552         if (!scon)
553                 return length;
554
555         tcon = kzalloc(size+1, GFP_KERNEL);
556         if (!tcon)
557                 goto out;
558
559         length = -EINVAL;
560         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
561                 goto out2;
562
563         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
564         if (length < 0)
565                 goto out2;
566         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
567         if (length < 0)
568                 goto out2;
569
570         length = security_transition_sid(ssid, tsid, tclass, &newsid);
571         if (length < 0)
572                 goto out2;
573
574         length = security_sid_to_context(newsid, &newcon, &len);
575         if (length < 0)
576                 goto out2;
577
578         if (len > SIMPLE_TRANSACTION_LIMIT) {
579                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
580                        "max\n", __FUNCTION__, len);
581                 length = -ERANGE;
582                 goto out3;
583         }
584
585         memcpy(buf, newcon, len);
586         length = len;
587 out3:
588         kfree(newcon);
589 out2:
590         kfree(tcon);
591 out:
592         kfree(scon);
593         return length;
594 }
595
596 static ssize_t sel_write_relabel(struct file * file, char *buf, size_t size)
597 {
598         char *scon, *tcon;
599         u32 ssid, tsid, newsid;
600         u16 tclass;
601         ssize_t length;
602         char *newcon;
603         u32 len;
604
605         length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
606         if (length)
607                 return length;
608
609         length = -ENOMEM;
610         scon = kzalloc(size+1, GFP_KERNEL);
611         if (!scon)
612                 return length;
613
614         tcon = kzalloc(size+1, GFP_KERNEL);
615         if (!tcon)
616                 goto out;
617
618         length = -EINVAL;
619         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
620                 goto out2;
621
622         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
623         if (length < 0)
624                 goto out2;
625         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
626         if (length < 0)
627                 goto out2;
628
629         length = security_change_sid(ssid, tsid, tclass, &newsid);
630         if (length < 0)
631                 goto out2;
632
633         length = security_sid_to_context(newsid, &newcon, &len);
634         if (length < 0)
635                 goto out2;
636
637         if (len > SIMPLE_TRANSACTION_LIMIT) {
638                 length = -ERANGE;
639                 goto out3;
640         }
641
642         memcpy(buf, newcon, len);
643         length = len;
644 out3:
645         kfree(newcon);
646 out2:
647         kfree(tcon);
648 out:
649         kfree(scon);
650         return length;
651 }
652
653 static ssize_t sel_write_user(struct file * file, char *buf, size_t size)
654 {
655         char *con, *user, *ptr;
656         u32 sid, *sids;
657         ssize_t length;
658         char *newcon;
659         int i, rc;
660         u32 len, nsids;
661
662         length = task_has_security(current, SECURITY__COMPUTE_USER);
663         if (length)
664                 return length;
665
666         length = -ENOMEM;
667         con = kzalloc(size+1, GFP_KERNEL);
668         if (!con)
669                 return length;
670
671         user = kzalloc(size+1, GFP_KERNEL);
672         if (!user)
673                 goto out;
674
675         length = -EINVAL;
676         if (sscanf(buf, "%s %s", con, user) != 2)
677                 goto out2;
678
679         length = security_context_to_sid(con, strlen(con)+1, &sid);
680         if (length < 0)
681                 goto out2;
682
683         length = security_get_user_sids(sid, user, &sids, &nsids);
684         if (length < 0)
685                 goto out2;
686
687         length = sprintf(buf, "%u", nsids) + 1;
688         ptr = buf + length;
689         for (i = 0; i < nsids; i++) {
690                 rc = security_sid_to_context(sids[i], &newcon, &len);
691                 if (rc) {
692                         length = rc;
693                         goto out3;
694                 }
695                 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
696                         kfree(newcon);
697                         length = -ERANGE;
698                         goto out3;
699                 }
700                 memcpy(ptr, newcon, len);
701                 kfree(newcon);
702                 ptr += len;
703                 length += len;
704         }
705 out3:
706         kfree(sids);
707 out2:
708         kfree(user);
709 out:
710         kfree(con);
711         return length;
712 }
713
714 static ssize_t sel_write_member(struct file * file, char *buf, size_t size)
715 {
716         char *scon, *tcon;
717         u32 ssid, tsid, newsid;
718         u16 tclass;
719         ssize_t length;
720         char *newcon;
721         u32 len;
722
723         length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
724         if (length)
725                 return length;
726
727         length = -ENOMEM;
728         scon = kzalloc(size+1, GFP_KERNEL);
729         if (!scon)
730                 return length;
731
732         tcon = kzalloc(size+1, GFP_KERNEL);
733         if (!tcon)
734                 goto out;
735
736         length = -EINVAL;
737         if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
738                 goto out2;
739
740         length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
741         if (length < 0)
742                 goto out2;
743         length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
744         if (length < 0)
745                 goto out2;
746
747         length = security_member_sid(ssid, tsid, tclass, &newsid);
748         if (length < 0)
749                 goto out2;
750
751         length = security_sid_to_context(newsid, &newcon, &len);
752         if (length < 0)
753                 goto out2;
754
755         if (len > SIMPLE_TRANSACTION_LIMIT) {
756                 printk(KERN_ERR "%s:  context size (%u) exceeds payload "
757                        "max\n", __FUNCTION__, len);
758                 length = -ERANGE;
759                 goto out3;
760         }
761
762         memcpy(buf, newcon, len);
763         length = len;
764 out3:
765         kfree(newcon);
766 out2:
767         kfree(tcon);
768 out:
769         kfree(scon);
770         return length;
771 }
772
773 static struct inode *sel_make_inode(struct super_block *sb, int mode)
774 {
775         struct inode *ret = new_inode(sb);
776
777         if (ret) {
778                 ret->i_mode = mode;
779                 ret->i_uid = ret->i_gid = 0;
780                 ret->i_blocks = 0;
781                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
782         }
783         return ret;
784 }
785
786 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
787                              size_t count, loff_t *ppos)
788 {
789         char *page = NULL;
790         ssize_t length;
791         ssize_t ret;
792         int cur_enforcing;
793         struct inode *inode;
794
795         mutex_lock(&sel_mutex);
796
797         ret = -EFAULT;
798
799         /* check to see if this file has been deleted */
800         if (!filep->f_op)
801                 goto out;
802
803         if (count > PAGE_SIZE) {
804                 ret = -EINVAL;
805                 goto out;
806         }
807         if (!(page = (char*)get_zeroed_page(GFP_KERNEL))) {
808                 ret = -ENOMEM;
809                 goto out;
810         }
811
812         inode = filep->f_path.dentry->d_inode;
813         cur_enforcing = security_get_bool_value(inode->i_ino&SEL_INO_MASK);
814         if (cur_enforcing < 0) {
815                 ret = cur_enforcing;
816                 goto out;
817         }
818
819         length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
820                           bool_pending_values[inode->i_ino&SEL_INO_MASK]);
821         ret = simple_read_from_buffer(buf, count, ppos, page, length);
822 out:
823         mutex_unlock(&sel_mutex);
824         if (page)
825                 free_page((unsigned long)page);
826         return ret;
827 }
828
829 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
830                               size_t count, loff_t *ppos)
831 {
832         char *page = NULL;
833         ssize_t length = -EFAULT;
834         int new_value;
835         struct inode *inode;
836
837         mutex_lock(&sel_mutex);
838
839         length = task_has_security(current, SECURITY__SETBOOL);
840         if (length)
841                 goto out;
842
843         /* check to see if this file has been deleted */
844         if (!filep->f_op)
845                 goto out;
846
847         if (count >= PAGE_SIZE) {
848                 length = -ENOMEM;
849                 goto out;
850         }
851         if (*ppos != 0) {
852                 /* No partial writes. */
853                 goto out;
854         }
855         page = (char*)get_zeroed_page(GFP_KERNEL);
856         if (!page) {
857                 length = -ENOMEM;
858                 goto out;
859         }
860
861         if (copy_from_user(page, buf, count))
862                 goto out;
863
864         length = -EINVAL;
865         if (sscanf(page, "%d", &new_value) != 1)
866                 goto out;
867
868         if (new_value)
869                 new_value = 1;
870
871         inode = filep->f_path.dentry->d_inode;
872         bool_pending_values[inode->i_ino&SEL_INO_MASK] = new_value;
873         length = count;
874
875 out:
876         mutex_unlock(&sel_mutex);
877         if (page)
878                 free_page((unsigned long) page);
879         return length;
880 }
881
882 static const struct file_operations sel_bool_ops = {
883         .read           = sel_read_bool,
884         .write          = sel_write_bool,
885 };
886
887 static ssize_t sel_commit_bools_write(struct file *filep,
888                                       const char __user *buf,
889                                       size_t count, loff_t *ppos)
890 {
891         char *page = NULL;
892         ssize_t length = -EFAULT;
893         int new_value;
894
895         mutex_lock(&sel_mutex);
896
897         length = task_has_security(current, SECURITY__SETBOOL);
898         if (length)
899                 goto out;
900
901         /* check to see if this file has been deleted */
902         if (!filep->f_op)
903                 goto out;
904
905         if (count >= PAGE_SIZE) {
906                 length = -ENOMEM;
907                 goto out;
908         }
909         if (*ppos != 0) {
910                 /* No partial writes. */
911                 goto out;
912         }
913         page = (char*)get_zeroed_page(GFP_KERNEL);
914         if (!page) {
915                 length = -ENOMEM;
916                 goto out;
917         }
918
919         if (copy_from_user(page, buf, count))
920                 goto out;
921
922         length = -EINVAL;
923         if (sscanf(page, "%d", &new_value) != 1)
924                 goto out;
925
926         if (new_value && bool_pending_values) {
927                 security_set_bools(bool_num, bool_pending_values);
928         }
929
930         length = count;
931
932 out:
933         mutex_unlock(&sel_mutex);
934         if (page)
935                 free_page((unsigned long) page);
936         return length;
937 }
938
939 static const struct file_operations sel_commit_bools_ops = {
940         .write          = sel_commit_bools_write,
941 };
942
943 /* delete booleans - partial revoke() from
944  * fs/proc/generic.c proc_kill_inodes */
945 static void sel_remove_bools(struct dentry *de)
946 {
947         struct list_head *p, *node;
948         struct super_block *sb = de->d_sb;
949
950         spin_lock(&dcache_lock);
951         node = de->d_subdirs.next;
952         while (node != &de->d_subdirs) {
953                 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
954                 list_del_init(node);
955
956                 if (d->d_inode) {
957                         d = dget_locked(d);
958                         spin_unlock(&dcache_lock);
959                         d_delete(d);
960                         simple_unlink(de->d_inode, d);
961                         dput(d);
962                         spin_lock(&dcache_lock);
963                 }
964                 node = de->d_subdirs.next;
965         }
966
967         spin_unlock(&dcache_lock);
968
969         file_list_lock();
970         list_for_each(p, &sb->s_files) {
971                 struct file * filp = list_entry(p, struct file, f_u.fu_list);
972                 struct dentry * dentry = filp->f_path.dentry;
973
974                 if (dentry->d_parent != de) {
975                         continue;
976                 }
977                 filp->f_op = NULL;
978         }
979         file_list_unlock();
980 }
981
982 #define BOOL_DIR_NAME "booleans"
983
984 static int sel_make_bools(void)
985 {
986         int i, ret = 0;
987         ssize_t len;
988         struct dentry *dentry = NULL;
989         struct dentry *dir = bool_dir;
990         struct inode *inode = NULL;
991         struct inode_security_struct *isec;
992         char **names = NULL, *page;
993         int num;
994         int *values = NULL;
995         u32 sid;
996
997         /* remove any existing files */
998         kfree(bool_pending_values);
999         bool_pending_values = NULL;
1000
1001         sel_remove_bools(dir);
1002
1003         if (!(page = (char*)get_zeroed_page(GFP_KERNEL)))
1004                 return -ENOMEM;
1005
1006         ret = security_get_bools(&num, &names, &values);
1007         if (ret != 0)
1008                 goto out;
1009
1010         for (i = 0; i < num; i++) {
1011                 dentry = d_alloc_name(dir, names[i]);
1012                 if (!dentry) {
1013                         ret = -ENOMEM;
1014                         goto err;
1015                 }
1016                 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1017                 if (!inode) {
1018                         ret = -ENOMEM;
1019                         goto err;
1020                 }
1021
1022                 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1023                 if (len < 0) {
1024                         ret = -EINVAL;
1025                         goto err;
1026                 } else if (len >= PAGE_SIZE) {
1027                         ret = -ENAMETOOLONG;
1028                         goto err;
1029                 }
1030                 isec = (struct inode_security_struct*)inode->i_security;
1031                 if ((ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid)))
1032                         goto err;
1033                 isec->sid = sid;
1034                 isec->initialized = 1;
1035                 inode->i_fop = &sel_bool_ops;
1036                 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1037                 d_add(dentry, inode);
1038         }
1039         bool_num = num;
1040         bool_pending_values = values;
1041 out:
1042         free_page((unsigned long)page);
1043         if (names) {
1044                 for (i = 0; i < num; i++)
1045                         kfree(names[i]);
1046                 kfree(names);
1047         }
1048         return ret;
1049 err:
1050         kfree(values);
1051         sel_remove_bools(dir);
1052         ret = -ENOMEM;
1053         goto out;
1054 }
1055
1056 #define NULL_FILE_NAME "null"
1057
1058 struct dentry *selinux_null = NULL;
1059
1060 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1061                                             size_t count, loff_t *ppos)
1062 {
1063         char tmpbuf[TMPBUFLEN];
1064         ssize_t length;
1065
1066         length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1067         return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1068 }
1069
1070 static ssize_t sel_write_avc_cache_threshold(struct file * file,
1071                                              const char __user * buf,
1072                                              size_t count, loff_t *ppos)
1073
1074 {
1075         char *page;
1076         ssize_t ret;
1077         int new_value;
1078
1079         if (count >= PAGE_SIZE) {
1080                 ret = -ENOMEM;
1081                 goto out;
1082         }
1083
1084         if (*ppos != 0) {
1085                 /* No partial writes. */
1086                 ret = -EINVAL;
1087                 goto out;
1088         }
1089
1090         page = (char*)get_zeroed_page(GFP_KERNEL);
1091         if (!page) {
1092                 ret = -ENOMEM;
1093                 goto out;
1094         }
1095
1096         if (copy_from_user(page, buf, count)) {
1097                 ret = -EFAULT;
1098                 goto out_free;
1099         }
1100
1101         if (sscanf(page, "%u", &new_value) != 1) {
1102                 ret = -EINVAL;
1103                 goto out;
1104         }
1105
1106         if (new_value != avc_cache_threshold) {
1107                 ret = task_has_security(current, SECURITY__SETSECPARAM);
1108                 if (ret)
1109                         goto out_free;
1110                 avc_cache_threshold = new_value;
1111         }
1112         ret = count;
1113 out_free:
1114         free_page((unsigned long)page);
1115 out:
1116         return ret;
1117 }
1118
1119 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1120                                        size_t count, loff_t *ppos)
1121 {
1122         char *page;
1123         ssize_t ret = 0;
1124
1125         page = (char *)__get_free_page(GFP_KERNEL);
1126         if (!page) {
1127                 ret = -ENOMEM;
1128                 goto out;
1129         }
1130         ret = avc_get_hash_stats(page);
1131         if (ret >= 0)
1132                 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1133         free_page((unsigned long)page);
1134 out:
1135         return ret;
1136 }
1137
1138 static const struct file_operations sel_avc_cache_threshold_ops = {
1139         .read           = sel_read_avc_cache_threshold,
1140         .write          = sel_write_avc_cache_threshold,
1141 };
1142
1143 static const struct file_operations sel_avc_hash_stats_ops = {
1144         .read           = sel_read_avc_hash_stats,
1145 };
1146
1147 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1148 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1149 {
1150         int cpu;
1151
1152         for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1153                 if (!cpu_possible(cpu))
1154                         continue;
1155                 *idx = cpu + 1;
1156                 return &per_cpu(avc_cache_stats, cpu);
1157         }
1158         return NULL;
1159 }
1160
1161 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1162 {
1163         loff_t n = *pos - 1;
1164
1165         if (*pos == 0)
1166                 return SEQ_START_TOKEN;
1167
1168         return sel_avc_get_stat_idx(&n);
1169 }
1170
1171 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1172 {
1173         return sel_avc_get_stat_idx(pos);
1174 }
1175
1176 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1177 {
1178         struct avc_cache_stats *st = v;
1179
1180         if (v == SEQ_START_TOKEN)
1181                 seq_printf(seq, "lookups hits misses allocations reclaims "
1182                            "frees\n");
1183         else
1184                 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1185                            st->hits, st->misses, st->allocations,
1186                            st->reclaims, st->frees);
1187         return 0;
1188 }
1189
1190 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1191 { }
1192
1193 static struct seq_operations sel_avc_cache_stats_seq_ops = {
1194         .start          = sel_avc_stats_seq_start,
1195         .next           = sel_avc_stats_seq_next,
1196         .show           = sel_avc_stats_seq_show,
1197         .stop           = sel_avc_stats_seq_stop,
1198 };
1199
1200 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1201 {
1202         return seq_open(file, &sel_avc_cache_stats_seq_ops);
1203 }
1204
1205 static const struct file_operations sel_avc_cache_stats_ops = {
1206         .open           = sel_open_avc_cache_stats,
1207         .read           = seq_read,
1208         .llseek         = seq_lseek,
1209         .release        = seq_release,
1210 };
1211 #endif
1212
1213 static int sel_make_avc_files(struct dentry *dir)
1214 {
1215         int i, ret = 0;
1216         static struct tree_descr files[] = {
1217                 { "cache_threshold",
1218                   &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1219                 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1220 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1221                 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1222 #endif
1223         };
1224
1225         for (i = 0; i < ARRAY_SIZE(files); i++) {
1226                 struct inode *inode;
1227                 struct dentry *dentry;
1228
1229                 dentry = d_alloc_name(dir, files[i].name);
1230                 if (!dentry) {
1231                         ret = -ENOMEM;
1232                         goto out;
1233                 }
1234
1235                 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1236                 if (!inode) {
1237                         ret = -ENOMEM;
1238                         goto out;
1239                 }
1240                 inode->i_fop = files[i].ops;
1241                 inode->i_ino = ++sel_last_ino;
1242                 d_add(dentry, inode);
1243         }
1244 out:
1245         return ret;
1246 }
1247
1248 static ssize_t sel_read_initcon(struct file * file, char __user *buf,
1249                                 size_t count, loff_t *ppos)
1250 {
1251         struct inode *inode;
1252         char *con;
1253         u32 sid, len;
1254         ssize_t ret;
1255
1256         inode = file->f_path.dentry->d_inode;
1257         sid = inode->i_ino&SEL_INO_MASK;
1258         ret = security_sid_to_context(sid, &con, &len);
1259         if (ret < 0)
1260                 return ret;
1261
1262         ret = simple_read_from_buffer(buf, count, ppos, con, len);
1263         kfree(con);
1264         return ret;
1265 }
1266
1267 static const struct file_operations sel_initcon_ops = {
1268         .read           = sel_read_initcon,
1269 };
1270
1271 static int sel_make_initcon_files(struct dentry *dir)
1272 {
1273         int i, ret = 0;
1274
1275         for (i = 1; i <= SECINITSID_NUM; i++) {
1276                 struct inode *inode;
1277                 struct dentry *dentry;
1278                 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1279                 if (!dentry) {
1280                         ret = -ENOMEM;
1281                         goto out;
1282                 }
1283
1284                 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1285                 if (!inode) {
1286                         ret = -ENOMEM;
1287                         goto out;
1288                 }
1289                 inode->i_fop = &sel_initcon_ops;
1290                 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1291                 d_add(dentry, inode);
1292         }
1293 out:
1294         return ret;
1295 }
1296
1297 static int sel_make_dir(struct inode *dir, struct dentry *dentry)
1298 {
1299         int ret = 0;
1300         struct inode *inode;
1301
1302         inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1303         if (!inode) {
1304                 ret = -ENOMEM;
1305                 goto out;
1306         }
1307         inode->i_op = &simple_dir_inode_operations;
1308         inode->i_fop = &simple_dir_operations;
1309         inode->i_ino = ++sel_last_ino;
1310         /* directory inodes start off with i_nlink == 2 (for "." entry) */
1311         inc_nlink(inode);
1312         d_add(dentry, inode);
1313         /* bump link count on parent directory, too */
1314         inc_nlink(dir);
1315 out:
1316         return ret;
1317 }
1318
1319 static int sel_fill_super(struct super_block * sb, void * data, int silent)
1320 {
1321         int ret;
1322         struct dentry *dentry;
1323         struct inode *inode, *root_inode;
1324         struct inode_security_struct *isec;
1325
1326         static struct tree_descr selinux_files[] = {
1327                 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1328                 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1329                 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1330                 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1331                 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1332                 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1333                 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1334                 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1335                 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1336                 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1337                 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1338                 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1339                 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1340                 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1341                 /* last one */ {""}
1342         };
1343         ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1344         if (ret)
1345                 goto err;
1346
1347         root_inode = sb->s_root->d_inode;
1348
1349         dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1350         if (!dentry) {
1351                 ret = -ENOMEM;
1352                 goto err;
1353         }
1354
1355         ret = sel_make_dir(root_inode, dentry);
1356         if (ret)
1357                 goto err;
1358
1359         bool_dir = dentry;
1360
1361         dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1362         if (!dentry) {
1363                 ret = -ENOMEM;
1364                 goto err;
1365         }
1366
1367         inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1368         if (!inode) {
1369                 ret = -ENOMEM;
1370                 goto err;
1371         }
1372         inode->i_ino = ++sel_last_ino;
1373         isec = (struct inode_security_struct*)inode->i_security;
1374         isec->sid = SECINITSID_DEVNULL;
1375         isec->sclass = SECCLASS_CHR_FILE;
1376         isec->initialized = 1;
1377
1378         init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1379         d_add(dentry, inode);
1380         selinux_null = dentry;
1381
1382         dentry = d_alloc_name(sb->s_root, "avc");
1383         if (!dentry) {
1384                 ret = -ENOMEM;
1385                 goto err;
1386         }
1387
1388         ret = sel_make_dir(root_inode, dentry);
1389         if (ret)
1390                 goto err;
1391
1392         ret = sel_make_avc_files(dentry);
1393         if (ret)
1394                 goto err;
1395
1396         dentry = d_alloc_name(sb->s_root, "initial_contexts");
1397         if (!dentry) {
1398                 ret = -ENOMEM;
1399                 goto err;
1400         }
1401
1402         ret = sel_make_dir(root_inode, dentry);
1403         if (ret)
1404                 goto err;
1405
1406         ret = sel_make_initcon_files(dentry);
1407         if (ret)
1408                 goto err;
1409
1410 out:
1411         return ret;
1412 err:
1413         printk(KERN_ERR "%s:  failed while creating inodes\n", __FUNCTION__);
1414         goto out;
1415 }
1416
1417 static int sel_get_sb(struct file_system_type *fs_type,
1418                       int flags, const char *dev_name, void *data,
1419                       struct vfsmount *mnt)
1420 {
1421         return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1422 }
1423
1424 static struct file_system_type sel_fs_type = {
1425         .name           = "selinuxfs",
1426         .get_sb         = sel_get_sb,
1427         .kill_sb        = kill_litter_super,
1428 };
1429
1430 struct vfsmount *selinuxfs_mount;
1431
1432 static int __init init_sel_fs(void)
1433 {
1434         int err;
1435
1436         if (!selinux_enabled)
1437                 return 0;
1438         err = register_filesystem(&sel_fs_type);
1439         if (!err) {
1440                 selinuxfs_mount = kern_mount(&sel_fs_type);
1441                 if (IS_ERR(selinuxfs_mount)) {
1442                         printk(KERN_ERR "selinuxfs:  could not mount!\n");
1443                         err = PTR_ERR(selinuxfs_mount);
1444                         selinuxfs_mount = NULL;
1445                 }
1446         }
1447         return err;
1448 }
1449
1450 __initcall(init_sel_fs);
1451
1452 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1453 void exit_sel_fs(void)
1454 {
1455         unregister_filesystem(&sel_fs_type);
1456 }
1457 #endif