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spi: efm32: Convert to use GPIO descriptors
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blob79c710911a3c9ed2fe4ab0ef405d389e72eaa01f
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 *
4 * Added conditional policy language extensions
5 *
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
7 *
8 * Added support for the policy capability bitmap
9 *
10 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
11 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
12 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/pagemap.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
19 #include <linux/fs.h>
20 #include <linux/fs_context.h>
21 #include <linux/mount.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 #include <linux/kobject.h>
32 #include <linux/ctype.h>
33
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
36
37 #include "flask.h"
38 #include "avc.h"
39 #include "avc_ss.h"
40 #include "security.h"
41 #include "objsec.h"
42 #include "conditional.h"
43
44 enum sel_inos {
45 SEL_ROOT_INO = 2,
46 SEL_LOAD, /* load policy */
47 SEL_ENFORCE, /* get or set enforcing status */
48 SEL_CONTEXT, /* validate context */
49 SEL_ACCESS, /* compute access decision */
50 SEL_CREATE, /* compute create labeling decision */
51 SEL_RELABEL, /* compute relabeling decision */
52 SEL_USER, /* compute reachable user contexts */
53 SEL_POLICYVERS, /* return policy version for this kernel */
54 SEL_COMMIT_BOOLS, /* commit new boolean values */
55 SEL_MLS, /* return if MLS policy is enabled */
56 SEL_DISABLE, /* disable SELinux until next reboot */
57 SEL_MEMBER, /* compute polyinstantiation membership decision */
58 SEL_CHECKREQPROT, /* check requested protection, not kernel-applied one */
59 SEL_COMPAT_NET, /* whether to use old compat network packet controls */
60 SEL_REJECT_UNKNOWN, /* export unknown reject handling to userspace */
61 SEL_DENY_UNKNOWN, /* export unknown deny handling to userspace */
62 SEL_STATUS, /* export current status using mmap() */
63 SEL_POLICY, /* allow userspace to read the in kernel policy */
64 SEL_VALIDATE_TRANS, /* compute validatetrans decision */
65 SEL_INO_NEXT, /* The next inode number to use */
66 };
67
68 struct selinux_fs_info {
69 struct dentry *bool_dir;
70 unsigned int bool_num;
71 char **bool_pending_names;
72 unsigned int *bool_pending_values;
73 struct dentry *class_dir;
74 unsigned long last_class_ino;
75 bool policy_opened;
76 struct dentry *policycap_dir;
77 struct mutex mutex;
78 unsigned long last_ino;
79 struct selinux_state *state;
80 struct super_block *sb;
81 };
82
83 static int selinux_fs_info_create(struct super_block *sb)
84 {
85 struct selinux_fs_info *fsi;
86
87 fsi = kzalloc(sizeof(*fsi), GFP_KERNEL);
88 if (!fsi)
89 return -ENOMEM;
90
91 mutex_init(&fsi->mutex);
92 fsi->last_ino = SEL_INO_NEXT - 1;
93 fsi->state = &selinux_state;
94 fsi->sb = sb;
95 sb->s_fs_info = fsi;
96 return 0;
97 }
98
99 static void selinux_fs_info_free(struct super_block *sb)
100 {
101 struct selinux_fs_info *fsi = sb->s_fs_info;
102 int i;
103
104 if (fsi) {
105 for (i = 0; i < fsi->bool_num; i++)
106 kfree(fsi->bool_pending_names[i]);
107 kfree(fsi->bool_pending_names);
108 kfree(fsi->bool_pending_values);
109 }
110 kfree(sb->s_fs_info);
111 sb->s_fs_info = NULL;
112 }
113
114 #define SEL_INITCON_INO_OFFSET 0x01000000
115 #define SEL_BOOL_INO_OFFSET 0x02000000
116 #define SEL_CLASS_INO_OFFSET 0x04000000
117 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
118 #define SEL_INO_MASK 0x00ffffff
119
120 #define TMPBUFLEN 12
121 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
122 size_t count, loff_t *ppos)
123 {
124 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
125 char tmpbuf[TMPBUFLEN];
126 ssize_t length;
127
128 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
129 enforcing_enabled(fsi->state));
130 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
131 }
132
133 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
134 static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
135 size_t count, loff_t *ppos)
136
137 {
138 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
139 struct selinux_state *state = fsi->state;
140 char *page = NULL;
141 ssize_t length;
142 int old_value, new_value;
143
144 if (count >= PAGE_SIZE)
145 return -ENOMEM;
146
147 /* No partial writes. */
148 if (*ppos != 0)
149 return -EINVAL;
150
151 page = memdup_user_nul(buf, count);
152 if (IS_ERR(page))
153 return PTR_ERR(page);
154
155 length = -EINVAL;
156 if (sscanf(page, "%d", &new_value) != 1)
157 goto out;
158
159 new_value = !!new_value;
160
161 old_value = enforcing_enabled(state);
162 if (new_value != old_value) {
163 length = avc_has_perm(&selinux_state,
164 current_sid(), SECINITSID_SECURITY,
165 SECCLASS_SECURITY, SECURITY__SETENFORCE,
166 NULL);
167 if (length)
168 goto out;
169 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
170 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
171 " enabled=1 old-enabled=1 lsm=selinux res=1",
172 new_value, old_value,
173 from_kuid(&init_user_ns, audit_get_loginuid(current)),
174 audit_get_sessionid(current));
175 enforcing_set(state, new_value);
176 if (new_value)
177 avc_ss_reset(state->avc, 0);
178 selnl_notify_setenforce(new_value);
179 selinux_status_update_setenforce(state, new_value);
180 if (!new_value)
181 call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
182 }
183 length = count;
184 out:
185 kfree(page);
186 return length;
187 }
188 #else
189 #define sel_write_enforce NULL
190 #endif
191
192 static const struct file_operations sel_enforce_ops = {
193 .read = sel_read_enforce,
194 .write = sel_write_enforce,
195 .llseek = generic_file_llseek,
196 };
197
198 static ssize_t sel_read_handle_unknown(struct file *filp, char __user *buf,
199 size_t count, loff_t *ppos)
200 {
201 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
202 struct selinux_state *state = fsi->state;
203 char tmpbuf[TMPBUFLEN];
204 ssize_t length;
205 ino_t ino = file_inode(filp)->i_ino;
206 int handle_unknown = (ino == SEL_REJECT_UNKNOWN) ?
207 security_get_reject_unknown(state) :
208 !security_get_allow_unknown(state);
209
210 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", handle_unknown);
211 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
212 }
213
214 static const struct file_operations sel_handle_unknown_ops = {
215 .read = sel_read_handle_unknown,
216 .llseek = generic_file_llseek,
217 };
218
219 static int sel_open_handle_status(struct inode *inode, struct file *filp)
220 {
221 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
222 struct page *status = selinux_kernel_status_page(fsi->state);
223
224 if (!status)
225 return -ENOMEM;
226
227 filp->private_data = status;
228
229 return 0;
230 }
231
232 static ssize_t sel_read_handle_status(struct file *filp, char __user *buf,
233 size_t count, loff_t *ppos)
234 {
235 struct page *status = filp->private_data;
236
237 BUG_ON(!status);
238
239 return simple_read_from_buffer(buf, count, ppos,
240 page_address(status),
241 sizeof(struct selinux_kernel_status));
242 }
243
244 static int sel_mmap_handle_status(struct file *filp,
245 struct vm_area_struct *vma)
246 {
247 struct page *status = filp->private_data;
248 unsigned long size = vma->vm_end - vma->vm_start;
249
250 BUG_ON(!status);
251
252 /* only allows one page from the head */
253 if (vma->vm_pgoff > 0 || size != PAGE_SIZE)
254 return -EIO;
255 /* disallow writable mapping */
256 if (vma->vm_flags & VM_WRITE)
257 return -EPERM;
258 /* disallow mprotect() turns it into writable */
259 vma->vm_flags &= ~VM_MAYWRITE;
260
261 return remap_pfn_range(vma, vma->vm_start,
262 page_to_pfn(status),
263 size, vma->vm_page_prot);
264 }
265
266 static const struct file_operations sel_handle_status_ops = {
267 .open = sel_open_handle_status,
268 .read = sel_read_handle_status,
269 .mmap = sel_mmap_handle_status,
270 .llseek = generic_file_llseek,
271 };
272
273 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
274 static ssize_t sel_write_disable(struct file *file, const char __user *buf,
275 size_t count, loff_t *ppos)
276
277 {
278 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
279 char *page;
280 ssize_t length;
281 int new_value;
282 int enforcing;
283
284 /* NOTE: we are now officially considering runtime disable as
285 * deprecated, and using it will become increasingly painful
286 * (e.g. sleeping/blocking) as we progress through future
287 * kernel releases until eventually it is removed
288 */
289 pr_err("SELinux: Runtime disable is deprecated, use selinux=0 on the kernel cmdline.\n");
290
291 if (count >= PAGE_SIZE)
292 return -ENOMEM;
293
294 /* No partial writes. */
295 if (*ppos != 0)
296 return -EINVAL;
297
298 page = memdup_user_nul(buf, count);
299 if (IS_ERR(page))
300 return PTR_ERR(page);
301
302 length = -EINVAL;
303 if (sscanf(page, "%d", &new_value) != 1)
304 goto out;
305
306 if (new_value) {
307 enforcing = enforcing_enabled(fsi->state);
308 length = selinux_disable(fsi->state);
309 if (length)
310 goto out;
311 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
312 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
313 " enabled=0 old-enabled=1 lsm=selinux res=1",
314 enforcing, enforcing,
315 from_kuid(&init_user_ns, audit_get_loginuid(current)),
316 audit_get_sessionid(current));
317 }
318
319 length = count;
320 out:
321 kfree(page);
322 return length;
323 }
324 #else
325 #define sel_write_disable NULL
326 #endif
327
328 static const struct file_operations sel_disable_ops = {
329 .write = sel_write_disable,
330 .llseek = generic_file_llseek,
331 };
332
333 static ssize_t sel_read_policyvers(struct file *filp, char __user *buf,
334 size_t count, loff_t *ppos)
335 {
336 char tmpbuf[TMPBUFLEN];
337 ssize_t length;
338
339 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", POLICYDB_VERSION_MAX);
340 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
341 }
342
343 static const struct file_operations sel_policyvers_ops = {
344 .read = sel_read_policyvers,
345 .llseek = generic_file_llseek,
346 };
347
348 /* declaration for sel_write_load */
349 static int sel_make_bools(struct selinux_fs_info *fsi);
350 static int sel_make_classes(struct selinux_fs_info *fsi);
351 static int sel_make_policycap(struct selinux_fs_info *fsi);
352
353 /* declaration for sel_make_class_dirs */
354 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
355 unsigned long *ino);
356
357 static ssize_t sel_read_mls(struct file *filp, char __user *buf,
358 size_t count, loff_t *ppos)
359 {
360 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
361 char tmpbuf[TMPBUFLEN];
362 ssize_t length;
363
364 length = scnprintf(tmpbuf, TMPBUFLEN, "%d",
365 security_mls_enabled(fsi->state));
366 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
367 }
368
369 static const struct file_operations sel_mls_ops = {
370 .read = sel_read_mls,
371 .llseek = generic_file_llseek,
372 };
373
374 struct policy_load_memory {
375 size_t len;
376 void *data;
377 };
378
379 static int sel_open_policy(struct inode *inode, struct file *filp)
380 {
381 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
382 struct selinux_state *state = fsi->state;
383 struct policy_load_memory *plm = NULL;
384 int rc;
385
386 BUG_ON(filp->private_data);
387
388 mutex_lock(&fsi->mutex);
389
390 rc = avc_has_perm(&selinux_state,
391 current_sid(), SECINITSID_SECURITY,
392 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
393 if (rc)
394 goto err;
395
396 rc = -EBUSY;
397 if (fsi->policy_opened)
398 goto err;
399
400 rc = -ENOMEM;
401 plm = kzalloc(sizeof(*plm), GFP_KERNEL);
402 if (!plm)
403 goto err;
404
405 if (i_size_read(inode) != security_policydb_len(state)) {
406 inode_lock(inode);
407 i_size_write(inode, security_policydb_len(state));
408 inode_unlock(inode);
409 }
410
411 rc = security_read_policy(state, &plm->data, &plm->len);
412 if (rc)
413 goto err;
414
415 fsi->policy_opened = 1;
416
417 filp->private_data = plm;
418
419 mutex_unlock(&fsi->mutex);
420
421 return 0;
422 err:
423 mutex_unlock(&fsi->mutex);
424
425 if (plm)
426 vfree(plm->data);
427 kfree(plm);
428 return rc;
429 }
430
431 static int sel_release_policy(struct inode *inode, struct file *filp)
432 {
433 struct selinux_fs_info *fsi = inode->i_sb->s_fs_info;
434 struct policy_load_memory *plm = filp->private_data;
435
436 BUG_ON(!plm);
437
438 fsi->policy_opened = 0;
439
440 vfree(plm->data);
441 kfree(plm);
442
443 return 0;
444 }
445
446 static ssize_t sel_read_policy(struct file *filp, char __user *buf,
447 size_t count, loff_t *ppos)
448 {
449 struct policy_load_memory *plm = filp->private_data;
450 int ret;
451
452 ret = avc_has_perm(&selinux_state,
453 current_sid(), SECINITSID_SECURITY,
454 SECCLASS_SECURITY, SECURITY__READ_POLICY, NULL);
455 if (ret)
456 return ret;
457
458 return simple_read_from_buffer(buf, count, ppos, plm->data, plm->len);
459 }
460
461 static vm_fault_t sel_mmap_policy_fault(struct vm_fault *vmf)
462 {
463 struct policy_load_memory *plm = vmf->vma->vm_file->private_data;
464 unsigned long offset;
465 struct page *page;
466
467 if (vmf->flags & (FAULT_FLAG_MKWRITE | FAULT_FLAG_WRITE))
468 return VM_FAULT_SIGBUS;
469
470 offset = vmf->pgoff << PAGE_SHIFT;
471 if (offset >= roundup(plm->len, PAGE_SIZE))
472 return VM_FAULT_SIGBUS;
473
474 page = vmalloc_to_page(plm->data + offset);
475 get_page(page);
476
477 vmf->page = page;
478
479 return 0;
480 }
481
482 static const struct vm_operations_struct sel_mmap_policy_ops = {
483 .fault = sel_mmap_policy_fault,
484 .page_mkwrite = sel_mmap_policy_fault,
485 };
486
487 static int sel_mmap_policy(struct file *filp, struct vm_area_struct *vma)
488 {
489 if (vma->vm_flags & VM_SHARED) {
490 /* do not allow mprotect to make mapping writable */
491 vma->vm_flags &= ~VM_MAYWRITE;
492
493 if (vma->vm_flags & VM_WRITE)
494 return -EACCES;
495 }
496
497 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
498 vma->vm_ops = &sel_mmap_policy_ops;
499
500 return 0;
501 }
502
503 static const struct file_operations sel_policy_ops = {
504 .open = sel_open_policy,
505 .read = sel_read_policy,
506 .mmap = sel_mmap_policy,
507 .release = sel_release_policy,
508 .llseek = generic_file_llseek,
509 };
510
511 static int sel_make_policy_nodes(struct selinux_fs_info *fsi)
512 {
513 int ret;
514
515 ret = sel_make_bools(fsi);
516 if (ret) {
517 pr_err("SELinux: failed to load policy booleans\n");
518 return ret;
519 }
520
521 ret = sel_make_classes(fsi);
522 if (ret) {
523 pr_err("SELinux: failed to load policy classes\n");
524 return ret;
525 }
526
527 ret = sel_make_policycap(fsi);
528 if (ret) {
529 pr_err("SELinux: failed to load policy capabilities\n");
530 return ret;
531 }
532
533 return 0;
534 }
535
536 static ssize_t sel_write_load(struct file *file, const char __user *buf,
537 size_t count, loff_t *ppos)
538
539 {
540 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
541 ssize_t length;
542 void *data = NULL;
543
544 mutex_lock(&fsi->mutex);
545
546 length = avc_has_perm(&selinux_state,
547 current_sid(), SECINITSID_SECURITY,
548 SECCLASS_SECURITY, SECURITY__LOAD_POLICY, NULL);
549 if (length)
550 goto out;
551
552 /* No partial writes. */
553 length = -EINVAL;
554 if (*ppos != 0)
555 goto out;
556
557 length = -ENOMEM;
558 data = vmalloc(count);
559 if (!data)
560 goto out;
561
562 length = -EFAULT;
563 if (copy_from_user(data, buf, count) != 0)
564 goto out;
565
566 length = security_load_policy(fsi->state, data, count);
567 if (length) {
568 pr_warn_ratelimited("SELinux: failed to load policy\n");
569 goto out;
570 }
571
572 length = sel_make_policy_nodes(fsi);
573 if (length)
574 goto out1;
575
576 length = count;
577
578 out1:
579 audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
580 "auid=%u ses=%u lsm=selinux res=1",
581 from_kuid(&init_user_ns, audit_get_loginuid(current)),
582 audit_get_sessionid(current));
583 out:
584 mutex_unlock(&fsi->mutex);
585 vfree(data);
586 return length;
587 }
588
589 static const struct file_operations sel_load_ops = {
590 .write = sel_write_load,
591 .llseek = generic_file_llseek,
592 };
593
594 static ssize_t sel_write_context(struct file *file, char *buf, size_t size)
595 {
596 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
597 struct selinux_state *state = fsi->state;
598 char *canon = NULL;
599 u32 sid, len;
600 ssize_t length;
601
602 length = avc_has_perm(&selinux_state,
603 current_sid(), SECINITSID_SECURITY,
604 SECCLASS_SECURITY, SECURITY__CHECK_CONTEXT, NULL);
605 if (length)
606 goto out;
607
608 length = security_context_to_sid(state, buf, size, &sid, GFP_KERNEL);
609 if (length)
610 goto out;
611
612 length = security_sid_to_context(state, sid, &canon, &len);
613 if (length)
614 goto out;
615
616 length = -ERANGE;
617 if (len > SIMPLE_TRANSACTION_LIMIT) {
618 pr_err("SELinux: %s: context size (%u) exceeds "
619 "payload max\n", __func__, len);
620 goto out;
621 }
622
623 memcpy(buf, canon, len);
624 length = len;
625 out:
626 kfree(canon);
627 return length;
628 }
629
630 static ssize_t sel_read_checkreqprot(struct file *filp, char __user *buf,
631 size_t count, loff_t *ppos)
632 {
633 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
634 char tmpbuf[TMPBUFLEN];
635 ssize_t length;
636
637 length = scnprintf(tmpbuf, TMPBUFLEN, "%u", fsi->state->checkreqprot);
638 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
639 }
640
641 static ssize_t sel_write_checkreqprot(struct file *file, const char __user *buf,
642 size_t count, loff_t *ppos)
643 {
644 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
645 char *page;
646 ssize_t length;
647 unsigned int new_value;
648
649 length = avc_has_perm(&selinux_state,
650 current_sid(), SECINITSID_SECURITY,
651 SECCLASS_SECURITY, SECURITY__SETCHECKREQPROT,
652 NULL);
653 if (length)
654 return length;
655
656 if (count >= PAGE_SIZE)
657 return -ENOMEM;
658
659 /* No partial writes. */
660 if (*ppos != 0)
661 return -EINVAL;
662
663 page = memdup_user_nul(buf, count);
664 if (IS_ERR(page))
665 return PTR_ERR(page);
666
667 length = -EINVAL;
668 if (sscanf(page, "%u", &new_value) != 1)
669 goto out;
670
671 fsi->state->checkreqprot = new_value ? 1 : 0;
672 length = count;
673 out:
674 kfree(page);
675 return length;
676 }
677 static const struct file_operations sel_checkreqprot_ops = {
678 .read = sel_read_checkreqprot,
679 .write = sel_write_checkreqprot,
680 .llseek = generic_file_llseek,
681 };
682
683 static ssize_t sel_write_validatetrans(struct file *file,
684 const char __user *buf,
685 size_t count, loff_t *ppos)
686 {
687 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
688 struct selinux_state *state = fsi->state;
689 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
690 char *req = NULL;
691 u32 osid, nsid, tsid;
692 u16 tclass;
693 int rc;
694
695 rc = avc_has_perm(&selinux_state,
696 current_sid(), SECINITSID_SECURITY,
697 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
698 if (rc)
699 goto out;
700
701 rc = -ENOMEM;
702 if (count >= PAGE_SIZE)
703 goto out;
704
705 /* No partial writes. */
706 rc = -EINVAL;
707 if (*ppos != 0)
708 goto out;
709
710 req = memdup_user_nul(buf, count);
711 if (IS_ERR(req)) {
712 rc = PTR_ERR(req);
713 req = NULL;
714 goto out;
715 }
716
717 rc = -ENOMEM;
718 oldcon = kzalloc(count + 1, GFP_KERNEL);
719 if (!oldcon)
720 goto out;
721
722 newcon = kzalloc(count + 1, GFP_KERNEL);
723 if (!newcon)
724 goto out;
725
726 taskcon = kzalloc(count + 1, GFP_KERNEL);
727 if (!taskcon)
728 goto out;
729
730 rc = -EINVAL;
731 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
732 goto out;
733
734 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
735 if (rc)
736 goto out;
737
738 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
739 if (rc)
740 goto out;
741
742 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
743 if (rc)
744 goto out;
745
746 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
747 if (!rc)
748 rc = count;
749 out:
750 kfree(req);
751 kfree(oldcon);
752 kfree(newcon);
753 kfree(taskcon);
754 return rc;
755 }
756
757 static const struct file_operations sel_transition_ops = {
758 .write = sel_write_validatetrans,
759 .llseek = generic_file_llseek,
760 };
761
762 /*
763 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
764 */
765 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
766 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
767 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
768 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
769 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
770
771 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
772 [SEL_ACCESS] = sel_write_access,
773 [SEL_CREATE] = sel_write_create,
774 [SEL_RELABEL] = sel_write_relabel,
775 [SEL_USER] = sel_write_user,
776 [SEL_MEMBER] = sel_write_member,
777 [SEL_CONTEXT] = sel_write_context,
778 };
779
780 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
781 {
782 ino_t ino = file_inode(file)->i_ino;
783 char *data;
784 ssize_t rv;
785
786 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
787 return -EINVAL;
788
789 data = simple_transaction_get(file, buf, size);
790 if (IS_ERR(data))
791 return PTR_ERR(data);
792
793 rv = write_op[ino](file, data, size);
794 if (rv > 0) {
795 simple_transaction_set(file, rv);
796 rv = size;
797 }
798 return rv;
799 }
800
801 static const struct file_operations transaction_ops = {
802 .write = selinux_transaction_write,
803 .read = simple_transaction_read,
804 .release = simple_transaction_release,
805 .llseek = generic_file_llseek,
806 };
807
808 /*
809 * payload - write methods
810 * If the method has a response, the response should be put in buf,
811 * and the length returned. Otherwise return 0 or and -error.
812 */
813
814 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
815 {
816 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
817 struct selinux_state *state = fsi->state;
818 char *scon = NULL, *tcon = NULL;
819 u32 ssid, tsid;
820 u16 tclass;
821 struct av_decision avd;
822 ssize_t length;
823
824 length = avc_has_perm(&selinux_state,
825 current_sid(), SECINITSID_SECURITY,
826 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
827 if (length)
828 goto out;
829
830 length = -ENOMEM;
831 scon = kzalloc(size + 1, GFP_KERNEL);
832 if (!scon)
833 goto out;
834
835 length = -ENOMEM;
836 tcon = kzalloc(size + 1, GFP_KERNEL);
837 if (!tcon)
838 goto out;
839
840 length = -EINVAL;
841 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
842 goto out;
843
844 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
845 if (length)
846 goto out;
847
848 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
849 if (length)
850 goto out;
851
852 security_compute_av_user(state, ssid, tsid, tclass, &avd);
853
854 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
855 "%x %x %x %x %u %x",
856 avd.allowed, 0xffffffff,
857 avd.auditallow, avd.auditdeny,
858 avd.seqno, avd.flags);
859 out:
860 kfree(tcon);
861 kfree(scon);
862 return length;
863 }
864
865 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
866 {
867 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
868 struct selinux_state *state = fsi->state;
869 char *scon = NULL, *tcon = NULL;
870 char *namebuf = NULL, *objname = NULL;
871 u32 ssid, tsid, newsid;
872 u16 tclass;
873 ssize_t length;
874 char *newcon = NULL;
875 u32 len;
876 int nargs;
877
878 length = avc_has_perm(&selinux_state,
879 current_sid(), SECINITSID_SECURITY,
880 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
881 NULL);
882 if (length)
883 goto out;
884
885 length = -ENOMEM;
886 scon = kzalloc(size + 1, GFP_KERNEL);
887 if (!scon)
888 goto out;
889
890 length = -ENOMEM;
891 tcon = kzalloc(size + 1, GFP_KERNEL);
892 if (!tcon)
893 goto out;
894
895 length = -ENOMEM;
896 namebuf = kzalloc(size + 1, GFP_KERNEL);
897 if (!namebuf)
898 goto out;
899
900 length = -EINVAL;
901 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
902 if (nargs < 3 || nargs > 4)
903 goto out;
904 if (nargs == 4) {
905 /*
906 * If and when the name of new object to be queried contains
907 * either whitespace or multibyte characters, they shall be
908 * encoded based on the percentage-encoding rule.
909 * If not encoded, the sscanf logic picks up only left-half
910 * of the supplied name; splitted by a whitespace unexpectedly.
911 */
912 char *r, *w;
913 int c1, c2;
914
915 r = w = namebuf;
916 do {
917 c1 = *r++;
918 if (c1 == '+')
919 c1 = ' ';
920 else if (c1 == '%') {
921 c1 = hex_to_bin(*r++);
922 if (c1 < 0)
923 goto out;
924 c2 = hex_to_bin(*r++);
925 if (c2 < 0)
926 goto out;
927 c1 = (c1 << 4) | c2;
928 }
929 *w++ = c1;
930 } while (c1 != '\0');
931
932 objname = namebuf;
933 }
934
935 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
936 if (length)
937 goto out;
938
939 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
940 if (length)
941 goto out;
942
943 length = security_transition_sid_user(state, ssid, tsid, tclass,
944 objname, &newsid);
945 if (length)
946 goto out;
947
948 length = security_sid_to_context(state, newsid, &newcon, &len);
949 if (length)
950 goto out;
951
952 length = -ERANGE;
953 if (len > SIMPLE_TRANSACTION_LIMIT) {
954 pr_err("SELinux: %s: context size (%u) exceeds "
955 "payload max\n", __func__, len);
956 goto out;
957 }
958
959 memcpy(buf, newcon, len);
960 length = len;
961 out:
962 kfree(newcon);
963 kfree(namebuf);
964 kfree(tcon);
965 kfree(scon);
966 return length;
967 }
968
969 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
970 {
971 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
972 struct selinux_state *state = fsi->state;
973 char *scon = NULL, *tcon = NULL;
974 u32 ssid, tsid, newsid;
975 u16 tclass;
976 ssize_t length;
977 char *newcon = NULL;
978 u32 len;
979
980 length = avc_has_perm(&selinux_state,
981 current_sid(), SECINITSID_SECURITY,
982 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
983 NULL);
984 if (length)
985 goto out;
986
987 length = -ENOMEM;
988 scon = kzalloc(size + 1, GFP_KERNEL);
989 if (!scon)
990 goto out;
991
992 length = -ENOMEM;
993 tcon = kzalloc(size + 1, GFP_KERNEL);
994 if (!tcon)
995 goto out;
996
997 length = -EINVAL;
998 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
999 goto out;
1000
1001 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1002 if (length)
1003 goto out;
1004
1005 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1006 if (length)
1007 goto out;
1008
1009 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1010 if (length)
1011 goto out;
1012
1013 length = security_sid_to_context(state, newsid, &newcon, &len);
1014 if (length)
1015 goto out;
1016
1017 length = -ERANGE;
1018 if (len > SIMPLE_TRANSACTION_LIMIT)
1019 goto out;
1020
1021 memcpy(buf, newcon, len);
1022 length = len;
1023 out:
1024 kfree(newcon);
1025 kfree(tcon);
1026 kfree(scon);
1027 return length;
1028 }
1029
1030 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1031 {
1032 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1033 struct selinux_state *state = fsi->state;
1034 char *con = NULL, *user = NULL, *ptr;
1035 u32 sid, *sids = NULL;
1036 ssize_t length;
1037 char *newcon;
1038 int i, rc;
1039 u32 len, nsids;
1040
1041 length = avc_has_perm(&selinux_state,
1042 current_sid(), SECINITSID_SECURITY,
1043 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1044 NULL);
1045 if (length)
1046 goto out;
1047
1048 length = -ENOMEM;
1049 con = kzalloc(size + 1, GFP_KERNEL);
1050 if (!con)
1051 goto out;
1052
1053 length = -ENOMEM;
1054 user = kzalloc(size + 1, GFP_KERNEL);
1055 if (!user)
1056 goto out;
1057
1058 length = -EINVAL;
1059 if (sscanf(buf, "%s %s", con, user) != 2)
1060 goto out;
1061
1062 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1063 if (length)
1064 goto out;
1065
1066 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1067 if (length)
1068 goto out;
1069
1070 length = sprintf(buf, "%u", nsids) + 1;
1071 ptr = buf + length;
1072 for (i = 0; i < nsids; i++) {
1073 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1074 if (rc) {
1075 length = rc;
1076 goto out;
1077 }
1078 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1079 kfree(newcon);
1080 length = -ERANGE;
1081 goto out;
1082 }
1083 memcpy(ptr, newcon, len);
1084 kfree(newcon);
1085 ptr += len;
1086 length += len;
1087 }
1088 out:
1089 kfree(sids);
1090 kfree(user);
1091 kfree(con);
1092 return length;
1093 }
1094
1095 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1096 {
1097 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1098 struct selinux_state *state = fsi->state;
1099 char *scon = NULL, *tcon = NULL;
1100 u32 ssid, tsid, newsid;
1101 u16 tclass;
1102 ssize_t length;
1103 char *newcon = NULL;
1104 u32 len;
1105
1106 length = avc_has_perm(&selinux_state,
1107 current_sid(), SECINITSID_SECURITY,
1108 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1109 NULL);
1110 if (length)
1111 goto out;
1112
1113 length = -ENOMEM;
1114 scon = kzalloc(size + 1, GFP_KERNEL);
1115 if (!scon)
1116 goto out;
1117
1118 length = -ENOMEM;
1119 tcon = kzalloc(size + 1, GFP_KERNEL);
1120 if (!tcon)
1121 goto out;
1122
1123 length = -EINVAL;
1124 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1125 goto out;
1126
1127 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1128 if (length)
1129 goto out;
1130
1131 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1132 if (length)
1133 goto out;
1134
1135 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1136 if (length)
1137 goto out;
1138
1139 length = security_sid_to_context(state, newsid, &newcon, &len);
1140 if (length)
1141 goto out;
1142
1143 length = -ERANGE;
1144 if (len > SIMPLE_TRANSACTION_LIMIT) {
1145 pr_err("SELinux: %s: context size (%u) exceeds "
1146 "payload max\n", __func__, len);
1147 goto out;
1148 }
1149
1150 memcpy(buf, newcon, len);
1151 length = len;
1152 out:
1153 kfree(newcon);
1154 kfree(tcon);
1155 kfree(scon);
1156 return length;
1157 }
1158
1159 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1160 {
1161 struct inode *ret = new_inode(sb);
1162
1163 if (ret) {
1164 ret->i_mode = mode;
1165 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1166 }
1167 return ret;
1168 }
1169
1170 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1171 size_t count, loff_t *ppos)
1172 {
1173 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1174 char *page = NULL;
1175 ssize_t length;
1176 ssize_t ret;
1177 int cur_enforcing;
1178 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1179 const char *name = filep->f_path.dentry->d_name.name;
1180
1181 mutex_lock(&fsi->mutex);
1182
1183 ret = -EINVAL;
1184 if (index >= fsi->bool_num || strcmp(name,
1185 fsi->bool_pending_names[index]))
1186 goto out_unlock;
1187
1188 ret = -ENOMEM;
1189 page = (char *)get_zeroed_page(GFP_KERNEL);
1190 if (!page)
1191 goto out_unlock;
1192
1193 cur_enforcing = security_get_bool_value(fsi->state, index);
1194 if (cur_enforcing < 0) {
1195 ret = cur_enforcing;
1196 goto out_unlock;
1197 }
1198 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1199 fsi->bool_pending_values[index]);
1200 mutex_unlock(&fsi->mutex);
1201 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1202 out_free:
1203 free_page((unsigned long)page);
1204 return ret;
1205
1206 out_unlock:
1207 mutex_unlock(&fsi->mutex);
1208 goto out_free;
1209 }
1210
1211 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1212 size_t count, loff_t *ppos)
1213 {
1214 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1215 char *page = NULL;
1216 ssize_t length;
1217 int new_value;
1218 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1219 const char *name = filep->f_path.dentry->d_name.name;
1220
1221 if (count >= PAGE_SIZE)
1222 return -ENOMEM;
1223
1224 /* No partial writes. */
1225 if (*ppos != 0)
1226 return -EINVAL;
1227
1228 page = memdup_user_nul(buf, count);
1229 if (IS_ERR(page))
1230 return PTR_ERR(page);
1231
1232 mutex_lock(&fsi->mutex);
1233
1234 length = avc_has_perm(&selinux_state,
1235 current_sid(), SECINITSID_SECURITY,
1236 SECCLASS_SECURITY, SECURITY__SETBOOL,
1237 NULL);
1238 if (length)
1239 goto out;
1240
1241 length = -EINVAL;
1242 if (index >= fsi->bool_num || strcmp(name,
1243 fsi->bool_pending_names[index]))
1244 goto out;
1245
1246 length = -EINVAL;
1247 if (sscanf(page, "%d", &new_value) != 1)
1248 goto out;
1249
1250 if (new_value)
1251 new_value = 1;
1252
1253 fsi->bool_pending_values[index] = new_value;
1254 length = count;
1255
1256 out:
1257 mutex_unlock(&fsi->mutex);
1258 kfree(page);
1259 return length;
1260 }
1261
1262 static const struct file_operations sel_bool_ops = {
1263 .read = sel_read_bool,
1264 .write = sel_write_bool,
1265 .llseek = generic_file_llseek,
1266 };
1267
1268 static ssize_t sel_commit_bools_write(struct file *filep,
1269 const char __user *buf,
1270 size_t count, loff_t *ppos)
1271 {
1272 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1273 char *page = NULL;
1274 ssize_t length;
1275 int new_value;
1276
1277 if (count >= PAGE_SIZE)
1278 return -ENOMEM;
1279
1280 /* No partial writes. */
1281 if (*ppos != 0)
1282 return -EINVAL;
1283
1284 page = memdup_user_nul(buf, count);
1285 if (IS_ERR(page))
1286 return PTR_ERR(page);
1287
1288 mutex_lock(&fsi->mutex);
1289
1290 length = avc_has_perm(&selinux_state,
1291 current_sid(), SECINITSID_SECURITY,
1292 SECCLASS_SECURITY, SECURITY__SETBOOL,
1293 NULL);
1294 if (length)
1295 goto out;
1296
1297 length = -EINVAL;
1298 if (sscanf(page, "%d", &new_value) != 1)
1299 goto out;
1300
1301 length = 0;
1302 if (new_value && fsi->bool_pending_values)
1303 length = security_set_bools(fsi->state, fsi->bool_num,
1304 fsi->bool_pending_values);
1305
1306 if (!length)
1307 length = count;
1308
1309 out:
1310 mutex_unlock(&fsi->mutex);
1311 kfree(page);
1312 return length;
1313 }
1314
1315 static const struct file_operations sel_commit_bools_ops = {
1316 .write = sel_commit_bools_write,
1317 .llseek = generic_file_llseek,
1318 };
1319
1320 static void sel_remove_entries(struct dentry *de)
1321 {
1322 d_genocide(de);
1323 shrink_dcache_parent(de);
1324 }
1325
1326 #define BOOL_DIR_NAME "booleans"
1327
1328 static int sel_make_bools(struct selinux_fs_info *fsi)
1329 {
1330 int i, ret;
1331 ssize_t len;
1332 struct dentry *dentry = NULL;
1333 struct dentry *dir = fsi->bool_dir;
1334 struct inode *inode = NULL;
1335 struct inode_security_struct *isec;
1336 char **names = NULL, *page;
1337 int num;
1338 int *values = NULL;
1339 u32 sid;
1340
1341 /* remove any existing files */
1342 for (i = 0; i < fsi->bool_num; i++)
1343 kfree(fsi->bool_pending_names[i]);
1344 kfree(fsi->bool_pending_names);
1345 kfree(fsi->bool_pending_values);
1346 fsi->bool_num = 0;
1347 fsi->bool_pending_names = NULL;
1348 fsi->bool_pending_values = NULL;
1349
1350 sel_remove_entries(dir);
1351
1352 ret = -ENOMEM;
1353 page = (char *)get_zeroed_page(GFP_KERNEL);
1354 if (!page)
1355 goto out;
1356
1357 ret = security_get_bools(fsi->state, &num, &names, &values);
1358 if (ret)
1359 goto out;
1360
1361 for (i = 0; i < num; i++) {
1362 ret = -ENOMEM;
1363 dentry = d_alloc_name(dir, names[i]);
1364 if (!dentry)
1365 goto out;
1366
1367 ret = -ENOMEM;
1368 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1369 if (!inode) {
1370 dput(dentry);
1371 goto out;
1372 }
1373
1374 ret = -ENAMETOOLONG;
1375 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1376 if (len >= PAGE_SIZE) {
1377 dput(dentry);
1378 iput(inode);
1379 goto out;
1380 }
1381
1382 isec = selinux_inode(inode);
1383 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1384 SECCLASS_FILE, &sid);
1385 if (ret) {
1386 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1387 page);
1388 sid = SECINITSID_SECURITY;
1389 }
1390
1391 isec->sid = sid;
1392 isec->initialized = LABEL_INITIALIZED;
1393 inode->i_fop = &sel_bool_ops;
1394 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1395 d_add(dentry, inode);
1396 }
1397 fsi->bool_num = num;
1398 fsi->bool_pending_names = names;
1399 fsi->bool_pending_values = values;
1400
1401 free_page((unsigned long)page);
1402 return 0;
1403 out:
1404 free_page((unsigned long)page);
1405
1406 if (names) {
1407 for (i = 0; i < num; i++)
1408 kfree(names[i]);
1409 kfree(names);
1410 }
1411 kfree(values);
1412 sel_remove_entries(dir);
1413
1414 return ret;
1415 }
1416
1417 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1418 size_t count, loff_t *ppos)
1419 {
1420 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1421 struct selinux_state *state = fsi->state;
1422 char tmpbuf[TMPBUFLEN];
1423 ssize_t length;
1424
1425 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1426 avc_get_cache_threshold(state->avc));
1427 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1428 }
1429
1430 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1431 const char __user *buf,
1432 size_t count, loff_t *ppos)
1433
1434 {
1435 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1436 struct selinux_state *state = fsi->state;
1437 char *page;
1438 ssize_t ret;
1439 unsigned int new_value;
1440
1441 ret = avc_has_perm(&selinux_state,
1442 current_sid(), SECINITSID_SECURITY,
1443 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1444 NULL);
1445 if (ret)
1446 return ret;
1447
1448 if (count >= PAGE_SIZE)
1449 return -ENOMEM;
1450
1451 /* No partial writes. */
1452 if (*ppos != 0)
1453 return -EINVAL;
1454
1455 page = memdup_user_nul(buf, count);
1456 if (IS_ERR(page))
1457 return PTR_ERR(page);
1458
1459 ret = -EINVAL;
1460 if (sscanf(page, "%u", &new_value) != 1)
1461 goto out;
1462
1463 avc_set_cache_threshold(state->avc, new_value);
1464
1465 ret = count;
1466 out:
1467 kfree(page);
1468 return ret;
1469 }
1470
1471 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1472 size_t count, loff_t *ppos)
1473 {
1474 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1475 struct selinux_state *state = fsi->state;
1476 char *page;
1477 ssize_t length;
1478
1479 page = (char *)__get_free_page(GFP_KERNEL);
1480 if (!page)
1481 return -ENOMEM;
1482
1483 length = avc_get_hash_stats(state->avc, page);
1484 if (length >= 0)
1485 length = simple_read_from_buffer(buf, count, ppos, page, length);
1486 free_page((unsigned long)page);
1487
1488 return length;
1489 }
1490
1491 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1492 size_t count, loff_t *ppos)
1493 {
1494 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1495 struct selinux_state *state = fsi->state;
1496 char *page;
1497 ssize_t length;
1498
1499 page = (char *)__get_free_page(GFP_KERNEL);
1500 if (!page)
1501 return -ENOMEM;
1502
1503 length = security_sidtab_hash_stats(state, page);
1504 if (length >= 0)
1505 length = simple_read_from_buffer(buf, count, ppos, page,
1506 length);
1507 free_page((unsigned long)page);
1508
1509 return length;
1510 }
1511
1512 static const struct file_operations sel_sidtab_hash_stats_ops = {
1513 .read = sel_read_sidtab_hash_stats,
1514 .llseek = generic_file_llseek,
1515 };
1516
1517 static const struct file_operations sel_avc_cache_threshold_ops = {
1518 .read = sel_read_avc_cache_threshold,
1519 .write = sel_write_avc_cache_threshold,
1520 .llseek = generic_file_llseek,
1521 };
1522
1523 static const struct file_operations sel_avc_hash_stats_ops = {
1524 .read = sel_read_avc_hash_stats,
1525 .llseek = generic_file_llseek,
1526 };
1527
1528 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1529 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1530 {
1531 int cpu;
1532
1533 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1534 if (!cpu_possible(cpu))
1535 continue;
1536 *idx = cpu + 1;
1537 return &per_cpu(avc_cache_stats, cpu);
1538 }
1539 return NULL;
1540 }
1541
1542 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1543 {
1544 loff_t n = *pos - 1;
1545
1546 if (*pos == 0)
1547 return SEQ_START_TOKEN;
1548
1549 return sel_avc_get_stat_idx(&n);
1550 }
1551
1552 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1553 {
1554 return sel_avc_get_stat_idx(pos);
1555 }
1556
1557 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1558 {
1559 struct avc_cache_stats *st = v;
1560
1561 if (v == SEQ_START_TOKEN) {
1562 seq_puts(seq,
1563 "lookups hits misses allocations reclaims frees\n");
1564 } else {
1565 unsigned int lookups = st->lookups;
1566 unsigned int misses = st->misses;
1567 unsigned int hits = lookups - misses;
1568 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1569 hits, misses, st->allocations,
1570 st->reclaims, st->frees);
1571 }
1572 return 0;
1573 }
1574
1575 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1576 { }
1577
1578 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1579 .start = sel_avc_stats_seq_start,
1580 .next = sel_avc_stats_seq_next,
1581 .show = sel_avc_stats_seq_show,
1582 .stop = sel_avc_stats_seq_stop,
1583 };
1584
1585 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1586 {
1587 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1588 }
1589
1590 static const struct file_operations sel_avc_cache_stats_ops = {
1591 .open = sel_open_avc_cache_stats,
1592 .read = seq_read,
1593 .llseek = seq_lseek,
1594 .release = seq_release,
1595 };
1596 #endif
1597
1598 static int sel_make_avc_files(struct dentry *dir)
1599 {
1600 struct super_block *sb = dir->d_sb;
1601 struct selinux_fs_info *fsi = sb->s_fs_info;
1602 int i;
1603 static const struct tree_descr files[] = {
1604 { "cache_threshold",
1605 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1606 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1607 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1608 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1609 #endif
1610 };
1611
1612 for (i = 0; i < ARRAY_SIZE(files); i++) {
1613 struct inode *inode;
1614 struct dentry *dentry;
1615
1616 dentry = d_alloc_name(dir, files[i].name);
1617 if (!dentry)
1618 return -ENOMEM;
1619
1620 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1621 if (!inode) {
1622 dput(dentry);
1623 return -ENOMEM;
1624 }
1625
1626 inode->i_fop = files[i].ops;
1627 inode->i_ino = ++fsi->last_ino;
1628 d_add(dentry, inode);
1629 }
1630
1631 return 0;
1632 }
1633
1634 static int sel_make_ss_files(struct dentry *dir)
1635 {
1636 struct super_block *sb = dir->d_sb;
1637 struct selinux_fs_info *fsi = sb->s_fs_info;
1638 int i;
1639 static struct tree_descr files[] = {
1640 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1641 };
1642
1643 for (i = 0; i < ARRAY_SIZE(files); i++) {
1644 struct inode *inode;
1645 struct dentry *dentry;
1646
1647 dentry = d_alloc_name(dir, files[i].name);
1648 if (!dentry)
1649 return -ENOMEM;
1650
1651 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1652 if (!inode) {
1653 dput(dentry);
1654 return -ENOMEM;
1655 }
1656
1657 inode->i_fop = files[i].ops;
1658 inode->i_ino = ++fsi->last_ino;
1659 d_add(dentry, inode);
1660 }
1661
1662 return 0;
1663 }
1664
1665 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1666 size_t count, loff_t *ppos)
1667 {
1668 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1669 char *con;
1670 u32 sid, len;
1671 ssize_t ret;
1672
1673 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1674 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1675 if (ret)
1676 return ret;
1677
1678 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1679 kfree(con);
1680 return ret;
1681 }
1682
1683 static const struct file_operations sel_initcon_ops = {
1684 .read = sel_read_initcon,
1685 .llseek = generic_file_llseek,
1686 };
1687
1688 static int sel_make_initcon_files(struct dentry *dir)
1689 {
1690 int i;
1691
1692 for (i = 1; i <= SECINITSID_NUM; i++) {
1693 struct inode *inode;
1694 struct dentry *dentry;
1695 dentry = d_alloc_name(dir, security_get_initial_sid_context(i));
1696 if (!dentry)
1697 return -ENOMEM;
1698
1699 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1700 if (!inode) {
1701 dput(dentry);
1702 return -ENOMEM;
1703 }
1704
1705 inode->i_fop = &sel_initcon_ops;
1706 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1707 d_add(dentry, inode);
1708 }
1709
1710 return 0;
1711 }
1712
1713 static inline unsigned long sel_class_to_ino(u16 class)
1714 {
1715 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1716 }
1717
1718 static inline u16 sel_ino_to_class(unsigned long ino)
1719 {
1720 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1721 }
1722
1723 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1724 {
1725 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1726 }
1727
1728 static inline u32 sel_ino_to_perm(unsigned long ino)
1729 {
1730 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1731 }
1732
1733 static ssize_t sel_read_class(struct file *file, char __user *buf,
1734 size_t count, loff_t *ppos)
1735 {
1736 unsigned long ino = file_inode(file)->i_ino;
1737 char res[TMPBUFLEN];
1738 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1739 return simple_read_from_buffer(buf, count, ppos, res, len);
1740 }
1741
1742 static const struct file_operations sel_class_ops = {
1743 .read = sel_read_class,
1744 .llseek = generic_file_llseek,
1745 };
1746
1747 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1748 size_t count, loff_t *ppos)
1749 {
1750 unsigned long ino = file_inode(file)->i_ino;
1751 char res[TMPBUFLEN];
1752 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1753 return simple_read_from_buffer(buf, count, ppos, res, len);
1754 }
1755
1756 static const struct file_operations sel_perm_ops = {
1757 .read = sel_read_perm,
1758 .llseek = generic_file_llseek,
1759 };
1760
1761 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1762 size_t count, loff_t *ppos)
1763 {
1764 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1765 int value;
1766 char tmpbuf[TMPBUFLEN];
1767 ssize_t length;
1768 unsigned long i_ino = file_inode(file)->i_ino;
1769
1770 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1771 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1772
1773 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1774 }
1775
1776 static const struct file_operations sel_policycap_ops = {
1777 .read = sel_read_policycap,
1778 .llseek = generic_file_llseek,
1779 };
1780
1781 static int sel_make_perm_files(char *objclass, int classvalue,
1782 struct dentry *dir)
1783 {
1784 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1785 int i, rc, nperms;
1786 char **perms;
1787
1788 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1789 if (rc)
1790 return rc;
1791
1792 for (i = 0; i < nperms; i++) {
1793 struct inode *inode;
1794 struct dentry *dentry;
1795
1796 rc = -ENOMEM;
1797 dentry = d_alloc_name(dir, perms[i]);
1798 if (!dentry)
1799 goto out;
1800
1801 rc = -ENOMEM;
1802 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1803 if (!inode) {
1804 dput(dentry);
1805 goto out;
1806 }
1807
1808 inode->i_fop = &sel_perm_ops;
1809 /* i+1 since perm values are 1-indexed */
1810 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1811 d_add(dentry, inode);
1812 }
1813 rc = 0;
1814 out:
1815 for (i = 0; i < nperms; i++)
1816 kfree(perms[i]);
1817 kfree(perms);
1818 return rc;
1819 }
1820
1821 static int sel_make_class_dir_entries(char *classname, int index,
1822 struct dentry *dir)
1823 {
1824 struct super_block *sb = dir->d_sb;
1825 struct selinux_fs_info *fsi = sb->s_fs_info;
1826 struct dentry *dentry = NULL;
1827 struct inode *inode = NULL;
1828 int rc;
1829
1830 dentry = d_alloc_name(dir, "index");
1831 if (!dentry)
1832 return -ENOMEM;
1833
1834 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1835 if (!inode) {
1836 dput(dentry);
1837 return -ENOMEM;
1838 }
1839
1840 inode->i_fop = &sel_class_ops;
1841 inode->i_ino = sel_class_to_ino(index);
1842 d_add(dentry, inode);
1843
1844 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1845 if (IS_ERR(dentry))
1846 return PTR_ERR(dentry);
1847
1848 rc = sel_make_perm_files(classname, index, dentry);
1849
1850 return rc;
1851 }
1852
1853 static int sel_make_classes(struct selinux_fs_info *fsi)
1854 {
1855
1856 int rc, nclasses, i;
1857 char **classes;
1858
1859 /* delete any existing entries */
1860 sel_remove_entries(fsi->class_dir);
1861
1862 rc = security_get_classes(fsi->state, &classes, &nclasses);
1863 if (rc)
1864 return rc;
1865
1866 /* +2 since classes are 1-indexed */
1867 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1868
1869 for (i = 0; i < nclasses; i++) {
1870 struct dentry *class_name_dir;
1871
1872 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1873 &fsi->last_class_ino);
1874 if (IS_ERR(class_name_dir)) {
1875 rc = PTR_ERR(class_name_dir);
1876 goto out;
1877 }
1878
1879 /* i+1 since class values are 1-indexed */
1880 rc = sel_make_class_dir_entries(classes[i], i + 1,
1881 class_name_dir);
1882 if (rc)
1883 goto out;
1884 }
1885 rc = 0;
1886 out:
1887 for (i = 0; i < nclasses; i++)
1888 kfree(classes[i]);
1889 kfree(classes);
1890 return rc;
1891 }
1892
1893 static int sel_make_policycap(struct selinux_fs_info *fsi)
1894 {
1895 unsigned int iter;
1896 struct dentry *dentry = NULL;
1897 struct inode *inode = NULL;
1898
1899 sel_remove_entries(fsi->policycap_dir);
1900
1901 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1902 if (iter < ARRAY_SIZE(selinux_policycap_names))
1903 dentry = d_alloc_name(fsi->policycap_dir,
1904 selinux_policycap_names[iter]);
1905 else
1906 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1907
1908 if (dentry == NULL)
1909 return -ENOMEM;
1910
1911 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1912 if (inode == NULL) {
1913 dput(dentry);
1914 return -ENOMEM;
1915 }
1916
1917 inode->i_fop = &sel_policycap_ops;
1918 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1919 d_add(dentry, inode);
1920 }
1921
1922 return 0;
1923 }
1924
1925 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1926 unsigned long *ino)
1927 {
1928 struct dentry *dentry = d_alloc_name(dir, name);
1929 struct inode *inode;
1930
1931 if (!dentry)
1932 return ERR_PTR(-ENOMEM);
1933
1934 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1935 if (!inode) {
1936 dput(dentry);
1937 return ERR_PTR(-ENOMEM);
1938 }
1939
1940 inode->i_op = &simple_dir_inode_operations;
1941 inode->i_fop = &simple_dir_operations;
1942 inode->i_ino = ++(*ino);
1943 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1944 inc_nlink(inode);
1945 d_add(dentry, inode);
1946 /* bump link count on parent directory, too */
1947 inc_nlink(d_inode(dir));
1948
1949 return dentry;
1950 }
1951
1952 #define NULL_FILE_NAME "null"
1953
1954 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1955 {
1956 struct selinux_fs_info *fsi;
1957 int ret;
1958 struct dentry *dentry;
1959 struct inode *inode;
1960 struct inode_security_struct *isec;
1961
1962 static const struct tree_descr selinux_files[] = {
1963 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1964 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1965 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1966 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1967 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1968 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1969 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1970 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1971 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1972 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1973 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1974 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1975 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1976 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1977 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1978 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1979 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1980 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1981 S_IWUGO},
1982 /* last one */ {""}
1983 };
1984
1985 ret = selinux_fs_info_create(sb);
1986 if (ret)
1987 goto err;
1988
1989 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
1990 if (ret)
1991 goto err;
1992
1993 fsi = sb->s_fs_info;
1994 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
1995 if (IS_ERR(fsi->bool_dir)) {
1996 ret = PTR_ERR(fsi->bool_dir);
1997 fsi->bool_dir = NULL;
1998 goto err;
1999 }
2000
2001 ret = -ENOMEM;
2002 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2003 if (!dentry)
2004 goto err;
2005
2006 ret = -ENOMEM;
2007 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2008 if (!inode) {
2009 dput(dentry);
2010 goto err;
2011 }
2012
2013 inode->i_ino = ++fsi->last_ino;
2014 isec = selinux_inode(inode);
2015 isec->sid = SECINITSID_DEVNULL;
2016 isec->sclass = SECCLASS_CHR_FILE;
2017 isec->initialized = LABEL_INITIALIZED;
2018
2019 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2020 d_add(dentry, inode);
2021
2022 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2023 if (IS_ERR(dentry)) {
2024 ret = PTR_ERR(dentry);
2025 goto err;
2026 }
2027
2028 ret = sel_make_avc_files(dentry);
2029
2030 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2031 if (IS_ERR(dentry)) {
2032 ret = PTR_ERR(dentry);
2033 goto err;
2034 }
2035
2036 ret = sel_make_ss_files(dentry);
2037 if (ret)
2038 goto err;
2039
2040 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2041 if (IS_ERR(dentry)) {
2042 ret = PTR_ERR(dentry);
2043 goto err;
2044 }
2045
2046 ret = sel_make_initcon_files(dentry);
2047 if (ret)
2048 goto err;
2049
2050 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
2051 if (IS_ERR(fsi->class_dir)) {
2052 ret = PTR_ERR(fsi->class_dir);
2053 fsi->class_dir = NULL;
2054 goto err;
2055 }
2056
2057 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
2058 &fsi->last_ino);
2059 if (IS_ERR(fsi->policycap_dir)) {
2060 ret = PTR_ERR(fsi->policycap_dir);
2061 fsi->policycap_dir = NULL;
2062 goto err;
2063 }
2064
2065 ret = sel_make_policy_nodes(fsi);
2066 if (ret)
2067 goto err;
2068 return 0;
2069 err:
2070 pr_err("SELinux: %s: failed while creating inodes\n",
2071 __func__);
2072
2073 selinux_fs_info_free(sb);
2074
2075 return ret;
2076 }
2077
2078 static int sel_get_tree(struct fs_context *fc)
2079 {
2080 return get_tree_single(fc, sel_fill_super);
2081 }
2082
2083 static const struct fs_context_operations sel_context_ops = {
2084 .get_tree = sel_get_tree,
2085 };
2086
2087 static int sel_init_fs_context(struct fs_context *fc)
2088 {
2089 fc->ops = &sel_context_ops;
2090 return 0;
2091 }
2092
2093 static void sel_kill_sb(struct super_block *sb)
2094 {
2095 selinux_fs_info_free(sb);
2096 kill_litter_super(sb);
2097 }
2098
2099 static struct file_system_type sel_fs_type = {
2100 .name = "selinuxfs",
2101 .init_fs_context = sel_init_fs_context,
2102 .kill_sb = sel_kill_sb,
2103 };
2104
2105 struct vfsmount *selinuxfs_mount;
2106 struct path selinux_null;
2107
2108 static int __init init_sel_fs(void)
2109 {
2110 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2111 sizeof(NULL_FILE_NAME)-1);
2112 int err;
2113
2114 if (!selinux_enabled_boot)
2115 return 0;
2116
2117 err = sysfs_create_mount_point(fs_kobj, "selinux");
2118 if (err)
2119 return err;
2120
2121 err = register_filesystem(&sel_fs_type);
2122 if (err) {
2123 sysfs_remove_mount_point(fs_kobj, "selinux");
2124 return err;
2125 }
2126
2127 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2128 if (IS_ERR(selinuxfs_mount)) {
2129 pr_err("selinuxfs: could not mount!\n");
2130 err = PTR_ERR(selinuxfs_mount);
2131 selinuxfs_mount = NULL;
2132 }
2133 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2134 &null_name);
2135 if (IS_ERR(selinux_null.dentry)) {
2136 pr_err("selinuxfs: could not lookup null!\n");
2137 err = PTR_ERR(selinux_null.dentry);
2138 selinux_null.dentry = NULL;
2139 }
2140
2141 return err;
2142 }
2143
2144 __initcall(init_sel_fs);
2145
2146 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2147 void exit_sel_fs(void)
2148 {
2149 sysfs_remove_mount_point(fs_kobj, "selinux");
2150 dput(selinux_null.dentry);
2151 kern_unmount(selinuxfs_mount);
2152 unregister_filesystem(&sel_fs_type);
2153 }
2154 #endif
Linux with added FPC-III support