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block: fix compiler warning in genhd.c
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / security / selinux / selinuxfs.c
blob69c9dccc8cf0a116beecd3b093950f5c9a33b791
1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
2 *
3 * Added conditional policy language extensions
4 *
5 * Updated: Hewlett-Packard <paul.moore@hp.com>
6 *
7 * Added support for the policy capability bitmap
8 *
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/fs.h>
22 #include <linux/mutex.h>
23 #include <linux/init.h>
24 #include <linux/string.h>
25 #include <linux/security.h>
26 #include <linux/major.h>
27 #include <linux/seq_file.h>
28 #include <linux/percpu.h>
29 #include <linux/audit.h>
30 #include <linux/uaccess.h>
31
32 /* selinuxfs pseudo filesystem for exporting the security policy API.
33 Based on the proc code and the fs/nfsd/nfsctl.c code. */
34
35 #include "flask.h"
36 #include "avc.h"
37 #include "avc_ss.h"
38 #include "security.h"
39 #include "objsec.h"
40 #include "conditional.h"
41
42 /* Policy capability filenames */
43 static char *policycap_names[] = {
44 "network_peer_controls",
45 "open_perms"
46 };
47
48 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
49
50 #ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
51 #define SELINUX_COMPAT_NET_VALUE 0
52 #else
53 #define SELINUX_COMPAT_NET_VALUE 1
54 #endif
55
56 int selinux_compat_net = SELINUX_COMPAT_NET_VALUE;
57
58 static int __init checkreqprot_setup(char *str)
59 {
60 unsigned long checkreqprot;
61 if (!strict_strtoul(str, 0, &checkreqprot))
62 selinux_checkreqprot = checkreqprot ? 1 : 0;
63 return 1;
64 }
65 __setup("checkreqprot=", checkreqprot_setup);
66
67 static int __init selinux_compat_net_setup(char *str)
68 {
69 unsigned long compat_net;
70 if (!strict_strtoul(str, 0, &compat_net))
71 selinux_compat_net = compat_net ? 1 : 0;
72 return 1;
73 }
74 __setup("selinux_compat_net=", selinux_compat_net_setup);
75
76
77 static DEFINE_MUTEX(sel_mutex);
78
79 /* global data for booleans */
80 static struct dentry *bool_dir;
81 static int bool_num;
82 static char **bool_pending_names;
83 static int *bool_pending_values;
84
85 /* global data for classes */
86 static struct dentry *class_dir;
87 static unsigned long last_class_ino;
88
89 /* global data for policy capabilities */
90 static struct dentry *policycap_dir;
91
92 extern void selnl_notify_setenforce(int val);
93
94 /* Check whether a task is allowed to use a security operation. */
95 static int task_has_security(struct task_struct *tsk,
96 u32 perms)
97 {
98 struct task_security_struct *tsec;
99
100 tsec = tsk->security;
101 if (!tsec)
102 return -EACCES;
103
104 return avc_has_perm(tsec->sid, SECINITSID_SECURITY,
105 SECCLASS_SECURITY, perms, NULL);
106 }
107
108 enum sel_inos {
109 SEL_ROOT_INO = 2,
110 SEL_LOAD, /* load policy */
111 SEL_ENFORCE, /* get or set enforcing status */
112 SEL_CONTEXT, /* validate context */
113 SEL_ACCESS, /* compute access decision */
114 SEL_CREATE, /* compute create labeling decision */
115 SEL_RELABEL, /* compute relabeling decision */
116 SEL_USER, /* compute reachable user contexts */
117 SEL_POLICYVERS, /* return policy version for this kernel */
118 SEL_COMMIT_BOOLS, /* commit new boolean values */
119 SEL_MLS, /* return if MLS policy is enabled */
120 SEL_DISABLE, /* disable SELinux until next reboot */
121 SEL_MEMBER, /* compute polyinstantiation membership decision */
122 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
123 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
124 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
125 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
126 SEL_INO_NEXT, /* The next inode number to use */
127 };
128
129 static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
130
131 #define SEL_INITCON_INO_OFFSET 0x01000000
132 #define SEL_BOOL_INO_OFFSET 0x02000000
133 #define SEL_CLASS_INO_OFFSET 0x04000000
134 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
135 #define SEL_INO_MASK 0x00ffffff
136
137 #define TMPBUFLEN 12
138 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
139 size_t count, loff_t *ppos)
140 {
141 char tmpbuf[TMPBUFLEN];
142 ssize_t length;
143
144 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_enforcing);
145 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
146 }
147
148 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
149 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
150 size_t count, loff_t *ppos)
151
152 {
153 char *page;
154 ssize_t length;
155 int new_value;
156
157 if (count >= PAGE_SIZE)
158 return -ENOMEM;
159 if (*ppos != 0) {
160 /* No partial writes. */
161 return -EINVAL;
162 }
163 page = (char *)get_zeroed_page(GFP_KERNEL);
164 if (!page)
165 return -ENOMEM;
166 length = -EFAULT;
167 if (copy_from_user(page, buf, count))
168 goto out;
169
170 length = -EINVAL;
171 if (sscanf(page, "%d", &new_value) != 1)
172 goto out;
173
174 if (new_value != selinux_enforcing) {
175 length = task_has_security(current, SECURITY__SETENFORCE);
176 if (length)
177 goto out;
178 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
179 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
180 new_value, selinux_enforcing,
181 audit_get_loginuid(current),
182 audit_get_sessionid(current));
183 selinux_enforcing = new_value;
184 if (selinux_enforcing)
185 avc_ss_reset(0);
186 selnl_notify_setenforce(selinux_enforcing);
187 }
188 length = count;
189 out:
190 free_page((unsigned long) page);
191 return length;
192 }
193 #else
194 #define sel_write_enforce NULL
195 #endif
196
197 static const struct file_operations sel_enforce_ops = {
198 .read = sel_read_enforce,
199 .write = sel_write_enforce,
200 };
201
202 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
203 size_t count, loff_t *ppos)
204 {
205 char tmpbuf[TMPBUFLEN];
206 ssize_t length;
207 ino_t ino = filp->f_path.dentry->d_inode->i_ino;
208 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
209 security_get_reject_unknown() : !security_get_allow_unknown();
210
211 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
212 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
213 }
214
215 static const struct file_operations sel_handle_unknown_ops = {
216 .read = sel_read_handle_unknown,
217 };
218
219 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
220 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
221 size_t count, loff_t *ppos)
222
223 {
224 char *page;
225 ssize_t length;
226 int new_value;
227 extern int selinux_disable(void);
228
229 if (count >= PAGE_SIZE)
230 return -ENOMEM;
231 if (*ppos != 0) {
232 /* No partial writes. */
233 return -EINVAL;
234 }
235 page = (char *)get_zeroed_page(GFP_KERNEL);
236 if (!page)
237 return -ENOMEM;
238 length = -EFAULT;
239 if (copy_from_user(page, buf, count))
240 goto out;
241
242 length = -EINVAL;
243 if (sscanf(page, "%d", &new_value) != 1)
244 goto out;
245
246 if (new_value) {
247 length = selinux_disable();
248 if (length < 0)
249 goto out;
250 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
251 "selinux=0 auid=%u ses=%u",
252 audit_get_loginuid(current),
253 audit_get_sessionid(current));
254 }
255
256 length = count;
257 out:
258 free_page((unsigned long) page);
259 return length;
260 }
261 #else
262 #define sel_write_disable NULL
263 #endif
264
265 static const struct file_operations sel_disable_ops = {
266 .write = sel_write_disable,
267 };
268
269 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
270 size_t count, loff_t *ppos)
271 {
272 char tmpbuf[TMPBUFLEN];
273 ssize_t length;
274
275 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
276 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
277 }
278
279 static const struct file_operations sel_policyvers_ops = {
280 .read = sel_read_policyvers,
281 };
282
283 /* declaration for sel_write_load */
284 static int sel_make_bools(void);
285 static int sel_make_classes(void);
286 static int sel_make_policycap(void);
287
288 /* declaration for sel_make_class_dirs */
289 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
290 unsigned long *ino);
291
292 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
293 size_t count, loff_t *ppos)
294 {
295 char tmpbuf[TMPBUFLEN];
296 ssize_t length;
297
298 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_mls_enabled);
299 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
300 }
301
302 static const struct file_operations sel_mls_ops = {
303 .read = sel_read_mls,
304 };
305
306 static ssize_t sel_write_load(struct file *file, const char __user *buf,
307 size_t count, loff_t *ppos)
308
309 {
310 int ret;
311 ssize_t length;
312 void *data = NULL;
313
314 mutex_lock(&sel_mutex);
315
316 length = task_has_security(current, SECURITY__LOAD_POLICY);
317 if (length)
318 goto out;
319
320 if (*ppos != 0) {
321 /* No partial writes. */
322 length = -EINVAL;
323 goto out;
324 }
325
326 if ((count > 64 * 1024 * 1024)
327 || (data = vmalloc(count)) == NULL) {
328 length = -ENOMEM;
329 goto out;
330 }
331
332 length = -EFAULT;
333 if (copy_from_user(data, buf, count) != 0)
334 goto out;
335
336 length = security_load_policy(data, count);
337 if (length)
338 goto out;
339
340 ret = sel_make_bools();
341 if (ret) {
342 length = ret;
343 goto out1;
344 }
345
346 ret = sel_make_classes();
347 if (ret) {
348 length = ret;
349 goto out1;
350 }
351
352 ret = sel_make_policycap();
353 if (ret)
354 length = ret;
355 else
356 length = count;
357
358 out1:
359 audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
360 "policy loaded auid=%u ses=%u",
361 audit_get_loginuid(current),
362 audit_get_sessionid(current));
363 out:
364 mutex_unlock(&sel_mutex);
365 vfree(data);
366 return length;
367 }
368
369 static const struct file_operations sel_load_ops = {
370 .write = sel_write_load,
371 };
372
373 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
374 {
375 char *canon;
376 u32 sid, len;
377 ssize_t length;
378
379 length = task_has_security(current, SECURITY__CHECK_CONTEXT);
380 if (length)
381 return length;
382
383 length = security_context_to_sid(buf, size, &sid);
384 if (length < 0)
385 return length;
386
387 length = security_sid_to_context(sid, &canon, &len);
388 if (length < 0)
389 return length;
390
391 if (len > SIMPLE_TRANSACTION_LIMIT) {
392 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
393 "payload max\n", __func__, len);
394 length = -ERANGE;
395 goto out;
396 }
397
398 memcpy(buf, canon, len);
399 length = len;
400 out:
401 kfree(canon);
402 return length;
403 }
404
405 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
406 size_t count, loff_t *ppos)
407 {
408 char tmpbuf[TMPBUFLEN];
409 ssize_t length;
410
411 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", selinux_checkreqprot);
412 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
413 }
414
415 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
416 size_t count, loff_t *ppos)
417 {
418 char *page;
419 ssize_t length;
420 unsigned int new_value;
421
422 length = task_has_security(current, SECURITY__SETCHECKREQPROT);
423 if (length)
424 return length;
425
426 if (count >= PAGE_SIZE)
427 return -ENOMEM;
428 if (*ppos != 0) {
429 /* No partial writes. */
430 return -EINVAL;
431 }
432 page = (char *)get_zeroed_page(GFP_KERNEL);
433 if (!page)
434 return -ENOMEM;
435 length = -EFAULT;
436 if (copy_from_user(page, buf, count))
437 goto out;
438
439 length = -EINVAL;
440 if (sscanf(page, "%u", &new_value) != 1)
441 goto out;
442
443 selinux_checkreqprot = new_value ? 1 : 0;
444 length = count;
445 out:
446 free_page((unsigned long) page);
447 return length;
448 }
449 static const struct file_operations sel_checkreqprot_ops = {
450 .read = sel_read_checkreqprot,
451 .write = sel_write_checkreqprot,
452 };
453
454 static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
455 size_t count, loff_t *ppos)
456 {
457 char tmpbuf[TMPBUFLEN];
458 ssize_t length;
459
460 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
461 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
462 }
463
464 static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
465 size_t count, loff_t *ppos)
466 {
467 char *page;
468 ssize_t length;
469 int new_value;
470
471 length = task_has_security(current, SECURITY__LOAD_POLICY);
472 if (length)
473 return length;
474
475 if (count >= PAGE_SIZE)
476 return -ENOMEM;
477 if (*ppos != 0) {
478 /* No partial writes. */
479 return -EINVAL;
480 }
481 page = (char *)get_zeroed_page(GFP_KERNEL);
482 if (!page)
483 return -ENOMEM;
484 length = -EFAULT;
485 if (copy_from_user(page, buf, count))
486 goto out;
487
488 length = -EINVAL;
489 if (sscanf(page, "%d", &new_value) != 1)
490 goto out;
491
492 selinux_compat_net = new_value ? 1 : 0;
493 length = count;
494 out:
495 free_page((unsigned long) page);
496 return length;
497 }
498 static const struct file_operations sel_compat_net_ops = {
499 .read = sel_read_compat_net,
500 .write = sel_write_compat_net,
501 };
502
503 /*
504 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
505 */
506 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
507 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
508 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
509 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
510 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
511
512 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
513 [SEL_ACCESS] = sel_write_access,
514 [SEL_CREATE] = sel_write_create,
515 [SEL_RELABEL] = sel_write_relabel,
516 [SEL_USER] = sel_write_user,
517 [SEL_MEMBER] = sel_write_member,
518 [SEL_CONTEXT] = sel_write_context,
519 };
520
521 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
522 {
523 ino_t ino = file->f_path.dentry->d_inode->i_ino;
524 char *data;
525 ssize_t rv;
526
527 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
528 return -EINVAL;
529
530 data = simple_transaction_get(file, buf, size);
531 if (IS_ERR(data))
532 return PTR_ERR(data);
533
534 rv = write_op[ino](file, data, size);
535 if (rv > 0) {
536 simple_transaction_set(file, rv);
537 rv = size;
538 }
539 return rv;
540 }
541
542 static const struct file_operations transaction_ops = {
543 .write = selinux_transaction_write,
544 .read = simple_transaction_read,
545 .release = simple_transaction_release,
546 };
547
548 /*
549 * payload - write methods
550 * If the method has a response, the response should be put in buf,
551 * and the length returned. Otherwise return 0 or and -error.
552 */
553
554 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
555 {
556 char *scon, *tcon;
557 u32 ssid, tsid;
558 u16 tclass;
559 u32 req;
560 struct av_decision avd;
561 ssize_t length;
562
563 length = task_has_security(current, SECURITY__COMPUTE_AV);
564 if (length)
565 return length;
566
567 length = -ENOMEM;
568 scon = kzalloc(size+1, GFP_KERNEL);
569 if (!scon)
570 return length;
571
572 tcon = kzalloc(size+1, GFP_KERNEL);
573 if (!tcon)
574 goto out;
575
576 length = -EINVAL;
577 if (sscanf(buf, "%s %s %hu %x", scon, tcon, &tclass, &req) != 4)
578 goto out2;
579
580 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
581 if (length < 0)
582 goto out2;
583 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
584 if (length < 0)
585 goto out2;
586
587 length = security_compute_av(ssid, tsid, tclass, req, &avd);
588 if (length < 0)
589 goto out2;
590
591 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
592 "%x %x %x %x %u",
593 avd.allowed, avd.decided,
594 avd.auditallow, avd.auditdeny,
595 avd.seqno);
596 out2:
597 kfree(tcon);
598 out:
599 kfree(scon);
600 return length;
601 }
602
603 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
604 {
605 char *scon, *tcon;
606 u32 ssid, tsid, newsid;
607 u16 tclass;
608 ssize_t length;
609 char *newcon;
610 u32 len;
611
612 length = task_has_security(current, SECURITY__COMPUTE_CREATE);
613 if (length)
614 return length;
615
616 length = -ENOMEM;
617 scon = kzalloc(size+1, GFP_KERNEL);
618 if (!scon)
619 return length;
620
621 tcon = kzalloc(size+1, GFP_KERNEL);
622 if (!tcon)
623 goto out;
624
625 length = -EINVAL;
626 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
627 goto out2;
628
629 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
630 if (length < 0)
631 goto out2;
632 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
633 if (length < 0)
634 goto out2;
635
636 length = security_transition_sid(ssid, tsid, tclass, &newsid);
637 if (length < 0)
638 goto out2;
639
640 length = security_sid_to_context(newsid, &newcon, &len);
641 if (length < 0)
642 goto out2;
643
644 if (len > SIMPLE_TRANSACTION_LIMIT) {
645 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
646 "payload max\n", __func__, len);
647 length = -ERANGE;
648 goto out3;
649 }
650
651 memcpy(buf, newcon, len);
652 length = len;
653 out3:
654 kfree(newcon);
655 out2:
656 kfree(tcon);
657 out:
658 kfree(scon);
659 return length;
660 }
661
662 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
663 {
664 char *scon, *tcon;
665 u32 ssid, tsid, newsid;
666 u16 tclass;
667 ssize_t length;
668 char *newcon;
669 u32 len;
670
671 length = task_has_security(current, SECURITY__COMPUTE_RELABEL);
672 if (length)
673 return length;
674
675 length = -ENOMEM;
676 scon = kzalloc(size+1, GFP_KERNEL);
677 if (!scon)
678 return length;
679
680 tcon = kzalloc(size+1, GFP_KERNEL);
681 if (!tcon)
682 goto out;
683
684 length = -EINVAL;
685 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
686 goto out2;
687
688 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
689 if (length < 0)
690 goto out2;
691 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
692 if (length < 0)
693 goto out2;
694
695 length = security_change_sid(ssid, tsid, tclass, &newsid);
696 if (length < 0)
697 goto out2;
698
699 length = security_sid_to_context(newsid, &newcon, &len);
700 if (length < 0)
701 goto out2;
702
703 if (len > SIMPLE_TRANSACTION_LIMIT) {
704 length = -ERANGE;
705 goto out3;
706 }
707
708 memcpy(buf, newcon, len);
709 length = len;
710 out3:
711 kfree(newcon);
712 out2:
713 kfree(tcon);
714 out:
715 kfree(scon);
716 return length;
717 }
718
719 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
720 {
721 char *con, *user, *ptr;
722 u32 sid, *sids;
723 ssize_t length;
724 char *newcon;
725 int i, rc;
726 u32 len, nsids;
727
728 length = task_has_security(current, SECURITY__COMPUTE_USER);
729 if (length)
730 return length;
731
732 length = -ENOMEM;
733 con = kzalloc(size+1, GFP_KERNEL);
734 if (!con)
735 return length;
736
737 user = kzalloc(size+1, GFP_KERNEL);
738 if (!user)
739 goto out;
740
741 length = -EINVAL;
742 if (sscanf(buf, "%s %s", con, user) != 2)
743 goto out2;
744
745 length = security_context_to_sid(con, strlen(con)+1, &sid);
746 if (length < 0)
747 goto out2;
748
749 length = security_get_user_sids(sid, user, &sids, &nsids);
750 if (length < 0)
751 goto out2;
752
753 length = sprintf(buf, "%u", nsids) + 1;
754 ptr = buf + length;
755 for (i = 0; i < nsids; i++) {
756 rc = security_sid_to_context(sids[i], &newcon, &len);
757 if (rc) {
758 length = rc;
759 goto out3;
760 }
761 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
762 kfree(newcon);
763 length = -ERANGE;
764 goto out3;
765 }
766 memcpy(ptr, newcon, len);
767 kfree(newcon);
768 ptr += len;
769 length += len;
770 }
771 out3:
772 kfree(sids);
773 out2:
774 kfree(user);
775 out:
776 kfree(con);
777 return length;
778 }
779
780 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
781 {
782 char *scon, *tcon;
783 u32 ssid, tsid, newsid;
784 u16 tclass;
785 ssize_t length;
786 char *newcon;
787 u32 len;
788
789 length = task_has_security(current, SECURITY__COMPUTE_MEMBER);
790 if (length)
791 return length;
792
793 length = -ENOMEM;
794 scon = kzalloc(size+1, GFP_KERNEL);
795 if (!scon)
796 return length;
797
798 tcon = kzalloc(size+1, GFP_KERNEL);
799 if (!tcon)
800 goto out;
801
802 length = -EINVAL;
803 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
804 goto out2;
805
806 length = security_context_to_sid(scon, strlen(scon)+1, &ssid);
807 if (length < 0)
808 goto out2;
809 length = security_context_to_sid(tcon, strlen(tcon)+1, &tsid);
810 if (length < 0)
811 goto out2;
812
813 length = security_member_sid(ssid, tsid, tclass, &newsid);
814 if (length < 0)
815 goto out2;
816
817 length = security_sid_to_context(newsid, &newcon, &len);
818 if (length < 0)
819 goto out2;
820
821 if (len > SIMPLE_TRANSACTION_LIMIT) {
822 printk(KERN_ERR "SELinux: %s: context size (%u) exceeds "
823 "payload max\n", __func__, len);
824 length = -ERANGE;
825 goto out3;
826 }
827
828 memcpy(buf, newcon, len);
829 length = len;
830 out3:
831 kfree(newcon);
832 out2:
833 kfree(tcon);
834 out:
835 kfree(scon);
836 return length;
837 }
838
839 static struct inode *sel_make_inode(struct super_block *sb, int mode)
840 {
841 struct inode *ret = new_inode(sb);
842
843 if (ret) {
844 ret->i_mode = mode;
845 ret->i_uid = ret->i_gid = 0;
846 ret->i_blocks = 0;
847 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
848 }
849 return ret;
850 }
851
852 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
853 size_t count, loff_t *ppos)
854 {
855 char *page = NULL;
856 ssize_t length;
857 ssize_t ret;
858 int cur_enforcing;
859 struct inode *inode = filep->f_path.dentry->d_inode;
860 unsigned index = inode->i_ino & SEL_INO_MASK;
861 const char *name = filep->f_path.dentry->d_name.name;
862
863 mutex_lock(&sel_mutex);
864
865 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
866 ret = -EINVAL;
867 goto out;
868 }
869
870 if (count > PAGE_SIZE) {
871 ret = -EINVAL;
872 goto out;
873 }
874 page = (char *)get_zeroed_page(GFP_KERNEL);
875 if (!page) {
876 ret = -ENOMEM;
877 goto out;
878 }
879
880 cur_enforcing = security_get_bool_value(index);
881 if (cur_enforcing < 0) {
882 ret = cur_enforcing;
883 goto out;
884 }
885 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
886 bool_pending_values[index]);
887 ret = simple_read_from_buffer(buf, count, ppos, page, length);
888 out:
889 mutex_unlock(&sel_mutex);
890 if (page)
891 free_page((unsigned long)page);
892 return ret;
893 }
894
895 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
896 size_t count, loff_t *ppos)
897 {
898 char *page = NULL;
899 ssize_t length;
900 int new_value;
901 struct inode *inode = filep->f_path.dentry->d_inode;
902 unsigned index = inode->i_ino & SEL_INO_MASK;
903 const char *name = filep->f_path.dentry->d_name.name;
904
905 mutex_lock(&sel_mutex);
906
907 length = task_has_security(current, SECURITY__SETBOOL);
908 if (length)
909 goto out;
910
911 if (index >= bool_num || strcmp(name, bool_pending_names[index])) {
912 length = -EINVAL;
913 goto out;
914 }
915
916 if (count >= PAGE_SIZE) {
917 length = -ENOMEM;
918 goto out;
919 }
920
921 if (*ppos != 0) {
922 /* No partial writes. */
923 length = -EINVAL;
924 goto out;
925 }
926 page = (char *)get_zeroed_page(GFP_KERNEL);
927 if (!page) {
928 length = -ENOMEM;
929 goto out;
930 }
931
932 length = -EFAULT;
933 if (copy_from_user(page, buf, count))
934 goto out;
935
936 length = -EINVAL;
937 if (sscanf(page, "%d", &new_value) != 1)
938 goto out;
939
940 if (new_value)
941 new_value = 1;
942
943 bool_pending_values[index] = new_value;
944 length = count;
945
946 out:
947 mutex_unlock(&sel_mutex);
948 if (page)
949 free_page((unsigned long) page);
950 return length;
951 }
952
953 static const struct file_operations sel_bool_ops = {
954 .read = sel_read_bool,
955 .write = sel_write_bool,
956 };
957
958 static ssize_t sel_commit_bools_write(struct file *filep,
959 const char __user *buf,
960 size_t count, loff_t *ppos)
961 {
962 char *page = NULL;
963 ssize_t length;
964 int new_value;
965
966 mutex_lock(&sel_mutex);
967
968 length = task_has_security(current, SECURITY__SETBOOL);
969 if (length)
970 goto out;
971
972 if (count >= PAGE_SIZE) {
973 length = -ENOMEM;
974 goto out;
975 }
976 if (*ppos != 0) {
977 /* No partial writes. */
978 goto out;
979 }
980 page = (char *)get_zeroed_page(GFP_KERNEL);
981 if (!page) {
982 length = -ENOMEM;
983 goto out;
984 }
985
986 length = -EFAULT;
987 if (copy_from_user(page, buf, count))
988 goto out;
989
990 length = -EINVAL;
991 if (sscanf(page, "%d", &new_value) != 1)
992 goto out;
993
994 if (new_value && bool_pending_values)
995 security_set_bools(bool_num, bool_pending_values);
996
997 length = count;
998
999 out:
1000 mutex_unlock(&sel_mutex);
1001 if (page)
1002 free_page((unsigned long) page);
1003 return length;
1004 }
1005
1006 static const struct file_operations sel_commit_bools_ops = {
1007 .write = sel_commit_bools_write,
1008 };
1009
1010 static void sel_remove_entries(struct dentry *de)
1011 {
1012 struct list_head *node;
1013
1014 spin_lock(&dcache_lock);
1015 node = de->d_subdirs.next;
1016 while (node != &de->d_subdirs) {
1017 struct dentry *d = list_entry(node, struct dentry, d_u.d_child);
1018 list_del_init(node);
1019
1020 if (d->d_inode) {
1021 d = dget_locked(d);
1022 spin_unlock(&dcache_lock);
1023 d_delete(d);
1024 simple_unlink(de->d_inode, d);
1025 dput(d);
1026 spin_lock(&dcache_lock);
1027 }
1028 node = de->d_subdirs.next;
1029 }
1030
1031 spin_unlock(&dcache_lock);
1032 }
1033
1034 #define BOOL_DIR_NAME "booleans"
1035
1036 static int sel_make_bools(void)
1037 {
1038 int i, ret = 0;
1039 ssize_t len;
1040 struct dentry *dentry = NULL;
1041 struct dentry *dir = bool_dir;
1042 struct inode *inode = NULL;
1043 struct inode_security_struct *isec;
1044 char **names = NULL, *page;
1045 int num;
1046 int *values = NULL;
1047 u32 sid;
1048
1049 /* remove any existing files */
1050 kfree(bool_pending_names);
1051 kfree(bool_pending_values);
1052 bool_pending_names = NULL;
1053 bool_pending_values = NULL;
1054
1055 sel_remove_entries(dir);
1056
1057 page = (char *)get_zeroed_page(GFP_KERNEL);
1058 if (!page)
1059 return -ENOMEM;
1060
1061 ret = security_get_bools(&num, &names, &values);
1062 if (ret != 0)
1063 goto out;
1064
1065 for (i = 0; i < num; i++) {
1066 dentry = d_alloc_name(dir, names[i]);
1067 if (!dentry) {
1068 ret = -ENOMEM;
1069 goto err;
1070 }
1071 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1072 if (!inode) {
1073 ret = -ENOMEM;
1074 goto err;
1075 }
1076
1077 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1078 if (len < 0) {
1079 ret = -EINVAL;
1080 goto err;
1081 } else if (len >= PAGE_SIZE) {
1082 ret = -ENAMETOOLONG;
1083 goto err;
1084 }
1085 isec = (struct inode_security_struct *)inode->i_security;
1086 ret = security_genfs_sid("selinuxfs", page, SECCLASS_FILE, &sid);
1087 if (ret)
1088 goto err;
1089 isec->sid = sid;
1090 isec->initialized = 1;
1091 inode->i_fop = &sel_bool_ops;
1092 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1093 d_add(dentry, inode);
1094 }
1095 bool_num = num;
1096 bool_pending_names = names;
1097 bool_pending_values = values;
1098 out:
1099 free_page((unsigned long)page);
1100 return ret;
1101 err:
1102 if (names) {
1103 for (i = 0; i < num; i++)
1104 kfree(names[i]);
1105 kfree(names);
1106 }
1107 kfree(values);
1108 sel_remove_entries(dir);
1109 ret = -ENOMEM;
1110 goto out;
1111 }
1112
1113 #define NULL_FILE_NAME "null"
1114
1115 struct dentry *selinux_null;
1116
1117 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1118 size_t count, loff_t *ppos)
1119 {
1120 char tmpbuf[TMPBUFLEN];
1121 ssize_t length;
1122
1123 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", avc_cache_threshold);
1124 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1125 }
1126
1127 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1128 const char __user *buf,
1129 size_t count, loff_t *ppos)
1130
1131 {
1132 char *page;
1133 ssize_t ret;
1134 int new_value;
1135
1136 if (count >= PAGE_SIZE) {
1137 ret = -ENOMEM;
1138 goto out;
1139 }
1140
1141 if (*ppos != 0) {
1142 /* No partial writes. */
1143 ret = -EINVAL;
1144 goto out;
1145 }
1146
1147 page = (char *)get_zeroed_page(GFP_KERNEL);
1148 if (!page) {
1149 ret = -ENOMEM;
1150 goto out;
1151 }
1152
1153 if (copy_from_user(page, buf, count)) {
1154 ret = -EFAULT;
1155 goto out_free;
1156 }
1157
1158 if (sscanf(page, "%u", &new_value) != 1) {
1159 ret = -EINVAL;
1160 goto out;
1161 }
1162
1163 if (new_value != avc_cache_threshold) {
1164 ret = task_has_security(current, SECURITY__SETSECPARAM);
1165 if (ret)
1166 goto out_free;
1167 avc_cache_threshold = new_value;
1168 }
1169 ret = count;
1170 out_free:
1171 free_page((unsigned long)page);
1172 out:
1173 return ret;
1174 }
1175
1176 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1177 size_t count, loff_t *ppos)
1178 {
1179 char *page;
1180 ssize_t ret = 0;
1181
1182 page = (char *)__get_free_page(GFP_KERNEL);
1183 if (!page) {
1184 ret = -ENOMEM;
1185 goto out;
1186 }
1187 ret = avc_get_hash_stats(page);
1188 if (ret >= 0)
1189 ret = simple_read_from_buffer(buf, count, ppos, page, ret);
1190 free_page((unsigned long)page);
1191 out:
1192 return ret;
1193 }
1194
1195 static const struct file_operations sel_avc_cache_threshold_ops = {
1196 .read = sel_read_avc_cache_threshold,
1197 .write = sel_write_avc_cache_threshold,
1198 };
1199
1200 static const struct file_operations sel_avc_hash_stats_ops = {
1201 .read = sel_read_avc_hash_stats,
1202 };
1203
1204 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1205 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1206 {
1207 int cpu;
1208
1209 for (cpu = *idx; cpu < NR_CPUS; ++cpu) {
1210 if (!cpu_possible(cpu))
1211 continue;
1212 *idx = cpu + 1;
1213 return &per_cpu(avc_cache_stats, cpu);
1214 }
1215 return NULL;
1216 }
1217
1218 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1219 {
1220 loff_t n = *pos - 1;
1221
1222 if (*pos == 0)
1223 return SEQ_START_TOKEN;
1224
1225 return sel_avc_get_stat_idx(&n);
1226 }
1227
1228 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1229 {
1230 return sel_avc_get_stat_idx(pos);
1231 }
1232
1233 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1234 {
1235 struct avc_cache_stats *st = v;
1236
1237 if (v == SEQ_START_TOKEN)
1238 seq_printf(seq, "lookups hits misses allocations reclaims "
1239 "frees\n");
1240 else
1241 seq_printf(seq, "%u %u %u %u %u %u\n", st->lookups,
1242 st->hits, st->misses, st->allocations,
1243 st->reclaims, st->frees);
1244 return 0;
1245 }
1246
1247 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1248 { }
1249
1250 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1251 .start = sel_avc_stats_seq_start,
1252 .next = sel_avc_stats_seq_next,
1253 .show = sel_avc_stats_seq_show,
1254 .stop = sel_avc_stats_seq_stop,
1255 };
1256
1257 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1258 {
1259 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1260 }
1261
1262 static const struct file_operations sel_avc_cache_stats_ops = {
1263 .open = sel_open_avc_cache_stats,
1264 .read = seq_read,
1265 .llseek = seq_lseek,
1266 .release = seq_release,
1267 };
1268 #endif
1269
1270 static int sel_make_avc_files(struct dentry *dir)
1271 {
1272 int i, ret = 0;
1273 static struct tree_descr files[] = {
1274 { "cache_threshold",
1275 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1276 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1277 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1278 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1279 #endif
1280 };
1281
1282 for (i = 0; i < ARRAY_SIZE(files); i++) {
1283 struct inode *inode;
1284 struct dentry *dentry;
1285
1286 dentry = d_alloc_name(dir, files[i].name);
1287 if (!dentry) {
1288 ret = -ENOMEM;
1289 goto out;
1290 }
1291
1292 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1293 if (!inode) {
1294 ret = -ENOMEM;
1295 goto out;
1296 }
1297 inode->i_fop = files[i].ops;
1298 inode->i_ino = ++sel_last_ino;
1299 d_add(dentry, inode);
1300 }
1301 out:
1302 return ret;
1303 }
1304
1305 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1306 size_t count, loff_t *ppos)
1307 {
1308 struct inode *inode;
1309 char *con;
1310 u32 sid, len;
1311 ssize_t ret;
1312
1313 inode = file->f_path.dentry->d_inode;
1314 sid = inode->i_ino&SEL_INO_MASK;
1315 ret = security_sid_to_context(sid, &con, &len);
1316 if (ret < 0)
1317 return ret;
1318
1319 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1320 kfree(con);
1321 return ret;
1322 }
1323
1324 static const struct file_operations sel_initcon_ops = {
1325 .read = sel_read_initcon,
1326 };
1327
1328 static int sel_make_initcon_files(struct dentry *dir)
1329 {
1330 int i, ret = 0;
1331
1332 for (i = 1; i <= SECINITSID_NUM; i++) {
1333 struct inode *inode;
1334 struct dentry *dentry;
1335 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1336 if (!dentry) {
1337 ret = -ENOMEM;
1338 goto out;
1339 }
1340
1341 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1342 if (!inode) {
1343 ret = -ENOMEM;
1344 goto out;
1345 }
1346 inode->i_fop = &sel_initcon_ops;
1347 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1348 d_add(dentry, inode);
1349 }
1350 out:
1351 return ret;
1352 }
1353
1354 static inline unsigned int sel_div(unsigned long a, unsigned long b)
1355 {
1356 return a / b - (a % b < 0);
1357 }
1358
1359 static inline unsigned long sel_class_to_ino(u16 class)
1360 {
1361 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1362 }
1363
1364 static inline u16 sel_ino_to_class(unsigned long ino)
1365 {
1366 return sel_div(ino & SEL_INO_MASK, SEL_VEC_MAX + 1);
1367 }
1368
1369 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1370 {
1371 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1372 }
1373
1374 static inline u32 sel_ino_to_perm(unsigned long ino)
1375 {
1376 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1377 }
1378
1379 static ssize_t sel_read_class(struct file *file, char __user *buf,
1380 size_t count, loff_t *ppos)
1381 {
1382 ssize_t rc, len;
1383 char *page;
1384 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1385
1386 page = (char *)__get_free_page(GFP_KERNEL);
1387 if (!page) {
1388 rc = -ENOMEM;
1389 goto out;
1390 }
1391
1392 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_class(ino));
1393 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1394 free_page((unsigned long)page);
1395 out:
1396 return rc;
1397 }
1398
1399 static const struct file_operations sel_class_ops = {
1400 .read = sel_read_class,
1401 };
1402
1403 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1404 size_t count, loff_t *ppos)
1405 {
1406 ssize_t rc, len;
1407 char *page;
1408 unsigned long ino = file->f_path.dentry->d_inode->i_ino;
1409
1410 page = (char *)__get_free_page(GFP_KERNEL);
1411 if (!page) {
1412 rc = -ENOMEM;
1413 goto out;
1414 }
1415
1416 len = snprintf(page, PAGE_SIZE, "%d", sel_ino_to_perm(ino));
1417 rc = simple_read_from_buffer(buf, count, ppos, page, len);
1418 free_page((unsigned long)page);
1419 out:
1420 return rc;
1421 }
1422
1423 static const struct file_operations sel_perm_ops = {
1424 .read = sel_read_perm,
1425 };
1426
1427 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1428 size_t count, loff_t *ppos)
1429 {
1430 int value;
1431 char tmpbuf[TMPBUFLEN];
1432 ssize_t length;
1433 unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
1434
1435 value = security_policycap_supported(i_ino & SEL_INO_MASK);
1436 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1437
1438 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1439 }
1440
1441 static const struct file_operations sel_policycap_ops = {
1442 .read = sel_read_policycap,
1443 };
1444
1445 static int sel_make_perm_files(char *objclass, int classvalue,
1446 struct dentry *dir)
1447 {
1448 int i, rc = 0, nperms;
1449 char **perms;
1450
1451 rc = security_get_permissions(objclass, &perms, &nperms);
1452 if (rc)
1453 goto out;
1454
1455 for (i = 0; i < nperms; i++) {
1456 struct inode *inode;
1457 struct dentry *dentry;
1458
1459 dentry = d_alloc_name(dir, perms[i]);
1460 if (!dentry) {
1461 rc = -ENOMEM;
1462 goto out1;
1463 }
1464
1465 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1466 if (!inode) {
1467 rc = -ENOMEM;
1468 goto out1;
1469 }
1470 inode->i_fop = &sel_perm_ops;
1471 /* i+1 since perm values are 1-indexed */
1472 inode->i_ino = sel_perm_to_ino(classvalue, i+1);
1473 d_add(dentry, inode);
1474 }
1475
1476 out1:
1477 for (i = 0; i < nperms; i++)
1478 kfree(perms[i]);
1479 kfree(perms);
1480 out:
1481 return rc;
1482 }
1483
1484 static int sel_make_class_dir_entries(char *classname, int index,
1485 struct dentry *dir)
1486 {
1487 struct dentry *dentry = NULL;
1488 struct inode *inode = NULL;
1489 int rc;
1490
1491 dentry = d_alloc_name(dir, "index");
1492 if (!dentry) {
1493 rc = -ENOMEM;
1494 goto out;
1495 }
1496
1497 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1498 if (!inode) {
1499 rc = -ENOMEM;
1500 goto out;
1501 }
1502
1503 inode->i_fop = &sel_class_ops;
1504 inode->i_ino = sel_class_to_ino(index);
1505 d_add(dentry, inode);
1506
1507 dentry = d_alloc_name(dir, "perms");
1508 if (!dentry) {
1509 rc = -ENOMEM;
1510 goto out;
1511 }
1512
1513 rc = sel_make_dir(dir->d_inode, dentry, &last_class_ino);
1514 if (rc)
1515 goto out;
1516
1517 rc = sel_make_perm_files(classname, index, dentry);
1518
1519 out:
1520 return rc;
1521 }
1522
1523 static void sel_remove_classes(void)
1524 {
1525 struct list_head *class_node;
1526
1527 list_for_each(class_node, &class_dir->d_subdirs) {
1528 struct dentry *class_subdir = list_entry(class_node,
1529 struct dentry, d_u.d_child);
1530 struct list_head *class_subdir_node;
1531
1532 list_for_each(class_subdir_node, &class_subdir->d_subdirs) {
1533 struct dentry *d = list_entry(class_subdir_node,
1534 struct dentry, d_u.d_child);
1535
1536 if (d->d_inode)
1537 if (d->d_inode->i_mode & S_IFDIR)
1538 sel_remove_entries(d);
1539 }
1540
1541 sel_remove_entries(class_subdir);
1542 }
1543
1544 sel_remove_entries(class_dir);
1545 }
1546
1547 static int sel_make_classes(void)
1548 {
1549 int rc = 0, nclasses, i;
1550 char **classes;
1551
1552 /* delete any existing entries */
1553 sel_remove_classes();
1554
1555 rc = security_get_classes(&classes, &nclasses);
1556 if (rc < 0)
1557 goto out;
1558
1559 /* +2 since classes are 1-indexed */
1560 last_class_ino = sel_class_to_ino(nclasses+2);
1561
1562 for (i = 0; i < nclasses; i++) {
1563 struct dentry *class_name_dir;
1564
1565 class_name_dir = d_alloc_name(class_dir, classes[i]);
1566 if (!class_name_dir) {
1567 rc = -ENOMEM;
1568 goto out1;
1569 }
1570
1571 rc = sel_make_dir(class_dir->d_inode, class_name_dir,
1572 &last_class_ino);
1573 if (rc)
1574 goto out1;
1575
1576 /* i+1 since class values are 1-indexed */
1577 rc = sel_make_class_dir_entries(classes[i], i+1,
1578 class_name_dir);
1579 if (rc)
1580 goto out1;
1581 }
1582
1583 out1:
1584 for (i = 0; i < nclasses; i++)
1585 kfree(classes[i]);
1586 kfree(classes);
1587 out:
1588 return rc;
1589 }
1590
1591 static int sel_make_policycap(void)
1592 {
1593 unsigned int iter;
1594 struct dentry *dentry = NULL;
1595 struct inode *inode = NULL;
1596
1597 sel_remove_entries(policycap_dir);
1598
1599 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1600 if (iter < ARRAY_SIZE(policycap_names))
1601 dentry = d_alloc_name(policycap_dir,
1602 policycap_names[iter]);
1603 else
1604 dentry = d_alloc_name(policycap_dir, "unknown");
1605
1606 if (dentry == NULL)
1607 return -ENOMEM;
1608
1609 inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
1610 if (inode == NULL)
1611 return -ENOMEM;
1612
1613 inode->i_fop = &sel_policycap_ops;
1614 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1615 d_add(dentry, inode);
1616 }
1617
1618 return 0;
1619 }
1620
1621 static int sel_make_dir(struct inode *dir, struct dentry *dentry,
1622 unsigned long *ino)
1623 {
1624 int ret = 0;
1625 struct inode *inode;
1626
1627 inode = sel_make_inode(dir->i_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1628 if (!inode) {
1629 ret = -ENOMEM;
1630 goto out;
1631 }
1632 inode->i_op = &simple_dir_inode_operations;
1633 inode->i_fop = &simple_dir_operations;
1634 inode->i_ino = ++(*ino);
1635 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1636 inc_nlink(inode);
1637 d_add(dentry, inode);
1638 /* bump link count on parent directory, too */
1639 inc_nlink(dir);
1640 out:
1641 return ret;
1642 }
1643
1644 static int sel_fill_super(struct super_block *sb, void *data, int silent)
1645 {
1646 int ret;
1647 struct dentry *dentry;
1648 struct inode *inode, *root_inode;
1649 struct inode_security_struct *isec;
1650
1651 static struct tree_descr selinux_files[] = {
1652 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1653 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1654 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1655 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1656 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1657 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1658 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1659 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1660 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1661 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1662 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1663 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1664 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1665 [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
1666 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1667 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1668 /* last one */ {""}
1669 };
1670 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1671 if (ret)
1672 goto err;
1673
1674 root_inode = sb->s_root->d_inode;
1675
1676 dentry = d_alloc_name(sb->s_root, BOOL_DIR_NAME);
1677 if (!dentry) {
1678 ret = -ENOMEM;
1679 goto err;
1680 }
1681
1682 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1683 if (ret)
1684 goto err;
1685
1686 bool_dir = dentry;
1687
1688 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
1689 if (!dentry) {
1690 ret = -ENOMEM;
1691 goto err;
1692 }
1693
1694 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
1695 if (!inode) {
1696 ret = -ENOMEM;
1697 goto err;
1698 }
1699 inode->i_ino = ++sel_last_ino;
1700 isec = (struct inode_security_struct *)inode->i_security;
1701 isec->sid = SECINITSID_DEVNULL;
1702 isec->sclass = SECCLASS_CHR_FILE;
1703 isec->initialized = 1;
1704
1705 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
1706 d_add(dentry, inode);
1707 selinux_null = dentry;
1708
1709 dentry = d_alloc_name(sb->s_root, "avc");
1710 if (!dentry) {
1711 ret = -ENOMEM;
1712 goto err;
1713 }
1714
1715 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1716 if (ret)
1717 goto err;
1718
1719 ret = sel_make_avc_files(dentry);
1720 if (ret)
1721 goto err;
1722
1723 dentry = d_alloc_name(sb->s_root, "initial_contexts");
1724 if (!dentry) {
1725 ret = -ENOMEM;
1726 goto err;
1727 }
1728
1729 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1730 if (ret)
1731 goto err;
1732
1733 ret = sel_make_initcon_files(dentry);
1734 if (ret)
1735 goto err;
1736
1737 dentry = d_alloc_name(sb->s_root, "class");
1738 if (!dentry) {
1739 ret = -ENOMEM;
1740 goto err;
1741 }
1742
1743 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1744 if (ret)
1745 goto err;
1746
1747 class_dir = dentry;
1748
1749 dentry = d_alloc_name(sb->s_root, "policy_capabilities");
1750 if (!dentry) {
1751 ret = -ENOMEM;
1752 goto err;
1753 }
1754
1755 ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
1756 if (ret)
1757 goto err;
1758
1759 policycap_dir = dentry;
1760
1761 out:
1762 return ret;
1763 err:
1764 printk(KERN_ERR "SELinux: %s: failed while creating inodes\n",
1765 __func__);
1766 goto out;
1767 }
1768
1769 static int sel_get_sb(struct file_system_type *fs_type,
1770 int flags, const char *dev_name, void *data,
1771 struct vfsmount *mnt)
1772 {
1773 return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
1774 }
1775
1776 static struct file_system_type sel_fs_type = {
1777 .name = "selinuxfs",
1778 .get_sb = sel_get_sb,
1779 .kill_sb = kill_litter_super,
1780 };
1781
1782 struct vfsmount *selinuxfs_mount;
1783
1784 static int __init init_sel_fs(void)
1785 {
1786 int err;
1787
1788 if (!selinux_enabled)
1789 return 0;
1790 err = register_filesystem(&sel_fs_type);
1791 if (!err) {
1792 selinuxfs_mount = kern_mount(&sel_fs_type);
1793 if (IS_ERR(selinuxfs_mount)) {
1794 printk(KERN_ERR "selinuxfs: could not mount!\n");
1795 err = PTR_ERR(selinuxfs_mount);
1796 selinuxfs_mount = NULL;
1797 }
1798 }
1799 return err;
1800 }
1801
1802 __initcall(init_sel_fs);
1803
1804 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1805 void exit_sel_fs(void)
1806 {
1807 unregister_filesystem(&sel_fs_type);
1808 }
1809 #endif
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree