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Merge tag 'tpmdd-next-20200421' of git://git.infradead.org/users/jjs/linux-tpmdd
[linux/fpc-iii.git] / security / selinux / selinuxfs.c
blob4781314c251094068e9fac1284fbce3f45c26f65
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 if (new_value) {
672 char comm[sizeof(current->comm)];
673
674 memcpy(comm, current->comm, sizeof(comm));
675 pr_warn_once("SELinux: %s (%d) set checkreqprot to 1. This is deprecated and will be rejected in a future kernel release.\n",
676 comm, current->pid);
677 }
678
679 fsi->state->checkreqprot = new_value ? 1 : 0;
680 length = count;
681 out:
682 kfree(page);
683 return length;
684 }
685 static const struct file_operations sel_checkreqprot_ops = {
686 .read = sel_read_checkreqprot,
687 .write = sel_write_checkreqprot,
688 .llseek = generic_file_llseek,
689 };
690
691 static ssize_t sel_write_validatetrans(struct file *file,
692 const char __user *buf,
693 size_t count, loff_t *ppos)
694 {
695 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
696 struct selinux_state *state = fsi->state;
697 char *oldcon = NULL, *newcon = NULL, *taskcon = NULL;
698 char *req = NULL;
699 u32 osid, nsid, tsid;
700 u16 tclass;
701 int rc;
702
703 rc = avc_has_perm(&selinux_state,
704 current_sid(), SECINITSID_SECURITY,
705 SECCLASS_SECURITY, SECURITY__VALIDATE_TRANS, NULL);
706 if (rc)
707 goto out;
708
709 rc = -ENOMEM;
710 if (count >= PAGE_SIZE)
711 goto out;
712
713 /* No partial writes. */
714 rc = -EINVAL;
715 if (*ppos != 0)
716 goto out;
717
718 req = memdup_user_nul(buf, count);
719 if (IS_ERR(req)) {
720 rc = PTR_ERR(req);
721 req = NULL;
722 goto out;
723 }
724
725 rc = -ENOMEM;
726 oldcon = kzalloc(count + 1, GFP_KERNEL);
727 if (!oldcon)
728 goto out;
729
730 newcon = kzalloc(count + 1, GFP_KERNEL);
731 if (!newcon)
732 goto out;
733
734 taskcon = kzalloc(count + 1, GFP_KERNEL);
735 if (!taskcon)
736 goto out;
737
738 rc = -EINVAL;
739 if (sscanf(req, "%s %s %hu %s", oldcon, newcon, &tclass, taskcon) != 4)
740 goto out;
741
742 rc = security_context_str_to_sid(state, oldcon, &osid, GFP_KERNEL);
743 if (rc)
744 goto out;
745
746 rc = security_context_str_to_sid(state, newcon, &nsid, GFP_KERNEL);
747 if (rc)
748 goto out;
749
750 rc = security_context_str_to_sid(state, taskcon, &tsid, GFP_KERNEL);
751 if (rc)
752 goto out;
753
754 rc = security_validate_transition_user(state, osid, nsid, tsid, tclass);
755 if (!rc)
756 rc = count;
757 out:
758 kfree(req);
759 kfree(oldcon);
760 kfree(newcon);
761 kfree(taskcon);
762 return rc;
763 }
764
765 static const struct file_operations sel_transition_ops = {
766 .write = sel_write_validatetrans,
767 .llseek = generic_file_llseek,
768 };
769
770 /*
771 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
772 */
773 static ssize_t sel_write_access(struct file *file, char *buf, size_t size);
774 static ssize_t sel_write_create(struct file *file, char *buf, size_t size);
775 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size);
776 static ssize_t sel_write_user(struct file *file, char *buf, size_t size);
777 static ssize_t sel_write_member(struct file *file, char *buf, size_t size);
778
779 static ssize_t (*const write_op[])(struct file *, char *, size_t) = {
780 [SEL_ACCESS] = sel_write_access,
781 [SEL_CREATE] = sel_write_create,
782 [SEL_RELABEL] = sel_write_relabel,
783 [SEL_USER] = sel_write_user,
784 [SEL_MEMBER] = sel_write_member,
785 [SEL_CONTEXT] = sel_write_context,
786 };
787
788 static ssize_t selinux_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
789 {
790 ino_t ino = file_inode(file)->i_ino;
791 char *data;
792 ssize_t rv;
793
794 if (ino >= ARRAY_SIZE(write_op) || !write_op[ino])
795 return -EINVAL;
796
797 data = simple_transaction_get(file, buf, size);
798 if (IS_ERR(data))
799 return PTR_ERR(data);
800
801 rv = write_op[ino](file, data, size);
802 if (rv > 0) {
803 simple_transaction_set(file, rv);
804 rv = size;
805 }
806 return rv;
807 }
808
809 static const struct file_operations transaction_ops = {
810 .write = selinux_transaction_write,
811 .read = simple_transaction_read,
812 .release = simple_transaction_release,
813 .llseek = generic_file_llseek,
814 };
815
816 /*
817 * payload - write methods
818 * If the method has a response, the response should be put in buf,
819 * and the length returned. Otherwise return 0 or and -error.
820 */
821
822 static ssize_t sel_write_access(struct file *file, char *buf, size_t size)
823 {
824 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
825 struct selinux_state *state = fsi->state;
826 char *scon = NULL, *tcon = NULL;
827 u32 ssid, tsid;
828 u16 tclass;
829 struct av_decision avd;
830 ssize_t length;
831
832 length = avc_has_perm(&selinux_state,
833 current_sid(), SECINITSID_SECURITY,
834 SECCLASS_SECURITY, SECURITY__COMPUTE_AV, NULL);
835 if (length)
836 goto out;
837
838 length = -ENOMEM;
839 scon = kzalloc(size + 1, GFP_KERNEL);
840 if (!scon)
841 goto out;
842
843 length = -ENOMEM;
844 tcon = kzalloc(size + 1, GFP_KERNEL);
845 if (!tcon)
846 goto out;
847
848 length = -EINVAL;
849 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
850 goto out;
851
852 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
853 if (length)
854 goto out;
855
856 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
857 if (length)
858 goto out;
859
860 security_compute_av_user(state, ssid, tsid, tclass, &avd);
861
862 length = scnprintf(buf, SIMPLE_TRANSACTION_LIMIT,
863 "%x %x %x %x %u %x",
864 avd.allowed, 0xffffffff,
865 avd.auditallow, avd.auditdeny,
866 avd.seqno, avd.flags);
867 out:
868 kfree(tcon);
869 kfree(scon);
870 return length;
871 }
872
873 static ssize_t sel_write_create(struct file *file, char *buf, size_t size)
874 {
875 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
876 struct selinux_state *state = fsi->state;
877 char *scon = NULL, *tcon = NULL;
878 char *namebuf = NULL, *objname = NULL;
879 u32 ssid, tsid, newsid;
880 u16 tclass;
881 ssize_t length;
882 char *newcon = NULL;
883 u32 len;
884 int nargs;
885
886 length = avc_has_perm(&selinux_state,
887 current_sid(), SECINITSID_SECURITY,
888 SECCLASS_SECURITY, SECURITY__COMPUTE_CREATE,
889 NULL);
890 if (length)
891 goto out;
892
893 length = -ENOMEM;
894 scon = kzalloc(size + 1, GFP_KERNEL);
895 if (!scon)
896 goto out;
897
898 length = -ENOMEM;
899 tcon = kzalloc(size + 1, GFP_KERNEL);
900 if (!tcon)
901 goto out;
902
903 length = -ENOMEM;
904 namebuf = kzalloc(size + 1, GFP_KERNEL);
905 if (!namebuf)
906 goto out;
907
908 length = -EINVAL;
909 nargs = sscanf(buf, "%s %s %hu %s", scon, tcon, &tclass, namebuf);
910 if (nargs < 3 || nargs > 4)
911 goto out;
912 if (nargs == 4) {
913 /*
914 * If and when the name of new object to be queried contains
915 * either whitespace or multibyte characters, they shall be
916 * encoded based on the percentage-encoding rule.
917 * If not encoded, the sscanf logic picks up only left-half
918 * of the supplied name; splitted by a whitespace unexpectedly.
919 */
920 char *r, *w;
921 int c1, c2;
922
923 r = w = namebuf;
924 do {
925 c1 = *r++;
926 if (c1 == '+')
927 c1 = ' ';
928 else if (c1 == '%') {
929 c1 = hex_to_bin(*r++);
930 if (c1 < 0)
931 goto out;
932 c2 = hex_to_bin(*r++);
933 if (c2 < 0)
934 goto out;
935 c1 = (c1 << 4) | c2;
936 }
937 *w++ = c1;
938 } while (c1 != '\0');
939
940 objname = namebuf;
941 }
942
943 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
944 if (length)
945 goto out;
946
947 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
948 if (length)
949 goto out;
950
951 length = security_transition_sid_user(state, ssid, tsid, tclass,
952 objname, &newsid);
953 if (length)
954 goto out;
955
956 length = security_sid_to_context(state, newsid, &newcon, &len);
957 if (length)
958 goto out;
959
960 length = -ERANGE;
961 if (len > SIMPLE_TRANSACTION_LIMIT) {
962 pr_err("SELinux: %s: context size (%u) exceeds "
963 "payload max\n", __func__, len);
964 goto out;
965 }
966
967 memcpy(buf, newcon, len);
968 length = len;
969 out:
970 kfree(newcon);
971 kfree(namebuf);
972 kfree(tcon);
973 kfree(scon);
974 return length;
975 }
976
977 static ssize_t sel_write_relabel(struct file *file, char *buf, size_t size)
978 {
979 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
980 struct selinux_state *state = fsi->state;
981 char *scon = NULL, *tcon = NULL;
982 u32 ssid, tsid, newsid;
983 u16 tclass;
984 ssize_t length;
985 char *newcon = NULL;
986 u32 len;
987
988 length = avc_has_perm(&selinux_state,
989 current_sid(), SECINITSID_SECURITY,
990 SECCLASS_SECURITY, SECURITY__COMPUTE_RELABEL,
991 NULL);
992 if (length)
993 goto out;
994
995 length = -ENOMEM;
996 scon = kzalloc(size + 1, GFP_KERNEL);
997 if (!scon)
998 goto out;
999
1000 length = -ENOMEM;
1001 tcon = kzalloc(size + 1, GFP_KERNEL);
1002 if (!tcon)
1003 goto out;
1004
1005 length = -EINVAL;
1006 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1007 goto out;
1008
1009 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1010 if (length)
1011 goto out;
1012
1013 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1014 if (length)
1015 goto out;
1016
1017 length = security_change_sid(state, ssid, tsid, tclass, &newsid);
1018 if (length)
1019 goto out;
1020
1021 length = security_sid_to_context(state, newsid, &newcon, &len);
1022 if (length)
1023 goto out;
1024
1025 length = -ERANGE;
1026 if (len > SIMPLE_TRANSACTION_LIMIT)
1027 goto out;
1028
1029 memcpy(buf, newcon, len);
1030 length = len;
1031 out:
1032 kfree(newcon);
1033 kfree(tcon);
1034 kfree(scon);
1035 return length;
1036 }
1037
1038 static ssize_t sel_write_user(struct file *file, char *buf, size_t size)
1039 {
1040 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1041 struct selinux_state *state = fsi->state;
1042 char *con = NULL, *user = NULL, *ptr;
1043 u32 sid, *sids = NULL;
1044 ssize_t length;
1045 char *newcon;
1046 int i, rc;
1047 u32 len, nsids;
1048
1049 length = avc_has_perm(&selinux_state,
1050 current_sid(), SECINITSID_SECURITY,
1051 SECCLASS_SECURITY, SECURITY__COMPUTE_USER,
1052 NULL);
1053 if (length)
1054 goto out;
1055
1056 length = -ENOMEM;
1057 con = kzalloc(size + 1, GFP_KERNEL);
1058 if (!con)
1059 goto out;
1060
1061 length = -ENOMEM;
1062 user = kzalloc(size + 1, GFP_KERNEL);
1063 if (!user)
1064 goto out;
1065
1066 length = -EINVAL;
1067 if (sscanf(buf, "%s %s", con, user) != 2)
1068 goto out;
1069
1070 length = security_context_str_to_sid(state, con, &sid, GFP_KERNEL);
1071 if (length)
1072 goto out;
1073
1074 length = security_get_user_sids(state, sid, user, &sids, &nsids);
1075 if (length)
1076 goto out;
1077
1078 length = sprintf(buf, "%u", nsids) + 1;
1079 ptr = buf + length;
1080 for (i = 0; i < nsids; i++) {
1081 rc = security_sid_to_context(state, sids[i], &newcon, &len);
1082 if (rc) {
1083 length = rc;
1084 goto out;
1085 }
1086 if ((length + len) >= SIMPLE_TRANSACTION_LIMIT) {
1087 kfree(newcon);
1088 length = -ERANGE;
1089 goto out;
1090 }
1091 memcpy(ptr, newcon, len);
1092 kfree(newcon);
1093 ptr += len;
1094 length += len;
1095 }
1096 out:
1097 kfree(sids);
1098 kfree(user);
1099 kfree(con);
1100 return length;
1101 }
1102
1103 static ssize_t sel_write_member(struct file *file, char *buf, size_t size)
1104 {
1105 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1106 struct selinux_state *state = fsi->state;
1107 char *scon = NULL, *tcon = NULL;
1108 u32 ssid, tsid, newsid;
1109 u16 tclass;
1110 ssize_t length;
1111 char *newcon = NULL;
1112 u32 len;
1113
1114 length = avc_has_perm(&selinux_state,
1115 current_sid(), SECINITSID_SECURITY,
1116 SECCLASS_SECURITY, SECURITY__COMPUTE_MEMBER,
1117 NULL);
1118 if (length)
1119 goto out;
1120
1121 length = -ENOMEM;
1122 scon = kzalloc(size + 1, GFP_KERNEL);
1123 if (!scon)
1124 goto out;
1125
1126 length = -ENOMEM;
1127 tcon = kzalloc(size + 1, GFP_KERNEL);
1128 if (!tcon)
1129 goto out;
1130
1131 length = -EINVAL;
1132 if (sscanf(buf, "%s %s %hu", scon, tcon, &tclass) != 3)
1133 goto out;
1134
1135 length = security_context_str_to_sid(state, scon, &ssid, GFP_KERNEL);
1136 if (length)
1137 goto out;
1138
1139 length = security_context_str_to_sid(state, tcon, &tsid, GFP_KERNEL);
1140 if (length)
1141 goto out;
1142
1143 length = security_member_sid(state, ssid, tsid, tclass, &newsid);
1144 if (length)
1145 goto out;
1146
1147 length = security_sid_to_context(state, newsid, &newcon, &len);
1148 if (length)
1149 goto out;
1150
1151 length = -ERANGE;
1152 if (len > SIMPLE_TRANSACTION_LIMIT) {
1153 pr_err("SELinux: %s: context size (%u) exceeds "
1154 "payload max\n", __func__, len);
1155 goto out;
1156 }
1157
1158 memcpy(buf, newcon, len);
1159 length = len;
1160 out:
1161 kfree(newcon);
1162 kfree(tcon);
1163 kfree(scon);
1164 return length;
1165 }
1166
1167 static struct inode *sel_make_inode(struct super_block *sb, int mode)
1168 {
1169 struct inode *ret = new_inode(sb);
1170
1171 if (ret) {
1172 ret->i_mode = mode;
1173 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
1174 }
1175 return ret;
1176 }
1177
1178 static ssize_t sel_read_bool(struct file *filep, char __user *buf,
1179 size_t count, loff_t *ppos)
1180 {
1181 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1182 char *page = NULL;
1183 ssize_t length;
1184 ssize_t ret;
1185 int cur_enforcing;
1186 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1187 const char *name = filep->f_path.dentry->d_name.name;
1188
1189 mutex_lock(&fsi->mutex);
1190
1191 ret = -EINVAL;
1192 if (index >= fsi->bool_num || strcmp(name,
1193 fsi->bool_pending_names[index]))
1194 goto out_unlock;
1195
1196 ret = -ENOMEM;
1197 page = (char *)get_zeroed_page(GFP_KERNEL);
1198 if (!page)
1199 goto out_unlock;
1200
1201 cur_enforcing = security_get_bool_value(fsi->state, index);
1202 if (cur_enforcing < 0) {
1203 ret = cur_enforcing;
1204 goto out_unlock;
1205 }
1206 length = scnprintf(page, PAGE_SIZE, "%d %d", cur_enforcing,
1207 fsi->bool_pending_values[index]);
1208 mutex_unlock(&fsi->mutex);
1209 ret = simple_read_from_buffer(buf, count, ppos, page, length);
1210 out_free:
1211 free_page((unsigned long)page);
1212 return ret;
1213
1214 out_unlock:
1215 mutex_unlock(&fsi->mutex);
1216 goto out_free;
1217 }
1218
1219 static ssize_t sel_write_bool(struct file *filep, const char __user *buf,
1220 size_t count, loff_t *ppos)
1221 {
1222 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1223 char *page = NULL;
1224 ssize_t length;
1225 int new_value;
1226 unsigned index = file_inode(filep)->i_ino & SEL_INO_MASK;
1227 const char *name = filep->f_path.dentry->d_name.name;
1228
1229 if (count >= PAGE_SIZE)
1230 return -ENOMEM;
1231
1232 /* No partial writes. */
1233 if (*ppos != 0)
1234 return -EINVAL;
1235
1236 page = memdup_user_nul(buf, count);
1237 if (IS_ERR(page))
1238 return PTR_ERR(page);
1239
1240 mutex_lock(&fsi->mutex);
1241
1242 length = avc_has_perm(&selinux_state,
1243 current_sid(), SECINITSID_SECURITY,
1244 SECCLASS_SECURITY, SECURITY__SETBOOL,
1245 NULL);
1246 if (length)
1247 goto out;
1248
1249 length = -EINVAL;
1250 if (index >= fsi->bool_num || strcmp(name,
1251 fsi->bool_pending_names[index]))
1252 goto out;
1253
1254 length = -EINVAL;
1255 if (sscanf(page, "%d", &new_value) != 1)
1256 goto out;
1257
1258 if (new_value)
1259 new_value = 1;
1260
1261 fsi->bool_pending_values[index] = new_value;
1262 length = count;
1263
1264 out:
1265 mutex_unlock(&fsi->mutex);
1266 kfree(page);
1267 return length;
1268 }
1269
1270 static const struct file_operations sel_bool_ops = {
1271 .read = sel_read_bool,
1272 .write = sel_write_bool,
1273 .llseek = generic_file_llseek,
1274 };
1275
1276 static ssize_t sel_commit_bools_write(struct file *filep,
1277 const char __user *buf,
1278 size_t count, loff_t *ppos)
1279 {
1280 struct selinux_fs_info *fsi = file_inode(filep)->i_sb->s_fs_info;
1281 char *page = NULL;
1282 ssize_t length;
1283 int new_value;
1284
1285 if (count >= PAGE_SIZE)
1286 return -ENOMEM;
1287
1288 /* No partial writes. */
1289 if (*ppos != 0)
1290 return -EINVAL;
1291
1292 page = memdup_user_nul(buf, count);
1293 if (IS_ERR(page))
1294 return PTR_ERR(page);
1295
1296 mutex_lock(&fsi->mutex);
1297
1298 length = avc_has_perm(&selinux_state,
1299 current_sid(), SECINITSID_SECURITY,
1300 SECCLASS_SECURITY, SECURITY__SETBOOL,
1301 NULL);
1302 if (length)
1303 goto out;
1304
1305 length = -EINVAL;
1306 if (sscanf(page, "%d", &new_value) != 1)
1307 goto out;
1308
1309 length = 0;
1310 if (new_value && fsi->bool_pending_values)
1311 length = security_set_bools(fsi->state, fsi->bool_num,
1312 fsi->bool_pending_values);
1313
1314 if (!length)
1315 length = count;
1316
1317 out:
1318 mutex_unlock(&fsi->mutex);
1319 kfree(page);
1320 return length;
1321 }
1322
1323 static const struct file_operations sel_commit_bools_ops = {
1324 .write = sel_commit_bools_write,
1325 .llseek = generic_file_llseek,
1326 };
1327
1328 static void sel_remove_entries(struct dentry *de)
1329 {
1330 d_genocide(de);
1331 shrink_dcache_parent(de);
1332 }
1333
1334 #define BOOL_DIR_NAME "booleans"
1335
1336 static int sel_make_bools(struct selinux_fs_info *fsi)
1337 {
1338 int ret;
1339 ssize_t len;
1340 struct dentry *dentry = NULL;
1341 struct dentry *dir = fsi->bool_dir;
1342 struct inode *inode = NULL;
1343 struct inode_security_struct *isec;
1344 char **names = NULL, *page;
1345 u32 i, num;
1346 int *values = NULL;
1347 u32 sid;
1348
1349 /* remove any existing files */
1350 for (i = 0; i < fsi->bool_num; i++)
1351 kfree(fsi->bool_pending_names[i]);
1352 kfree(fsi->bool_pending_names);
1353 kfree(fsi->bool_pending_values);
1354 fsi->bool_num = 0;
1355 fsi->bool_pending_names = NULL;
1356 fsi->bool_pending_values = NULL;
1357
1358 sel_remove_entries(dir);
1359
1360 ret = -ENOMEM;
1361 page = (char *)get_zeroed_page(GFP_KERNEL);
1362 if (!page)
1363 goto out;
1364
1365 ret = security_get_bools(fsi->state, &num, &names, &values);
1366 if (ret)
1367 goto out;
1368
1369 for (i = 0; i < num; i++) {
1370 ret = -ENOMEM;
1371 dentry = d_alloc_name(dir, names[i]);
1372 if (!dentry)
1373 goto out;
1374
1375 ret = -ENOMEM;
1376 inode = sel_make_inode(dir->d_sb, S_IFREG | S_IRUGO | S_IWUSR);
1377 if (!inode) {
1378 dput(dentry);
1379 goto out;
1380 }
1381
1382 ret = -ENAMETOOLONG;
1383 len = snprintf(page, PAGE_SIZE, "/%s/%s", BOOL_DIR_NAME, names[i]);
1384 if (len >= PAGE_SIZE) {
1385 dput(dentry);
1386 iput(inode);
1387 goto out;
1388 }
1389
1390 isec = selinux_inode(inode);
1391 ret = security_genfs_sid(fsi->state, "selinuxfs", page,
1392 SECCLASS_FILE, &sid);
1393 if (ret) {
1394 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1395 page);
1396 sid = SECINITSID_SECURITY;
1397 }
1398
1399 isec->sid = sid;
1400 isec->initialized = LABEL_INITIALIZED;
1401 inode->i_fop = &sel_bool_ops;
1402 inode->i_ino = i|SEL_BOOL_INO_OFFSET;
1403 d_add(dentry, inode);
1404 }
1405 fsi->bool_num = num;
1406 fsi->bool_pending_names = names;
1407 fsi->bool_pending_values = values;
1408
1409 free_page((unsigned long)page);
1410 return 0;
1411 out:
1412 free_page((unsigned long)page);
1413
1414 if (names) {
1415 for (i = 0; i < num; i++)
1416 kfree(names[i]);
1417 kfree(names);
1418 }
1419 kfree(values);
1420 sel_remove_entries(dir);
1421
1422 return ret;
1423 }
1424
1425 static ssize_t sel_read_avc_cache_threshold(struct file *filp, char __user *buf,
1426 size_t count, loff_t *ppos)
1427 {
1428 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1429 struct selinux_state *state = fsi->state;
1430 char tmpbuf[TMPBUFLEN];
1431 ssize_t length;
1432
1433 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1434 avc_get_cache_threshold(state->avc));
1435 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1436 }
1437
1438 static ssize_t sel_write_avc_cache_threshold(struct file *file,
1439 const char __user *buf,
1440 size_t count, loff_t *ppos)
1441
1442 {
1443 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1444 struct selinux_state *state = fsi->state;
1445 char *page;
1446 ssize_t ret;
1447 unsigned int new_value;
1448
1449 ret = avc_has_perm(&selinux_state,
1450 current_sid(), SECINITSID_SECURITY,
1451 SECCLASS_SECURITY, SECURITY__SETSECPARAM,
1452 NULL);
1453 if (ret)
1454 return ret;
1455
1456 if (count >= PAGE_SIZE)
1457 return -ENOMEM;
1458
1459 /* No partial writes. */
1460 if (*ppos != 0)
1461 return -EINVAL;
1462
1463 page = memdup_user_nul(buf, count);
1464 if (IS_ERR(page))
1465 return PTR_ERR(page);
1466
1467 ret = -EINVAL;
1468 if (sscanf(page, "%u", &new_value) != 1)
1469 goto out;
1470
1471 avc_set_cache_threshold(state->avc, new_value);
1472
1473 ret = count;
1474 out:
1475 kfree(page);
1476 return ret;
1477 }
1478
1479 static ssize_t sel_read_avc_hash_stats(struct file *filp, char __user *buf,
1480 size_t count, loff_t *ppos)
1481 {
1482 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1483 struct selinux_state *state = fsi->state;
1484 char *page;
1485 ssize_t length;
1486
1487 page = (char *)__get_free_page(GFP_KERNEL);
1488 if (!page)
1489 return -ENOMEM;
1490
1491 length = avc_get_hash_stats(state->avc, page);
1492 if (length >= 0)
1493 length = simple_read_from_buffer(buf, count, ppos, page, length);
1494 free_page((unsigned long)page);
1495
1496 return length;
1497 }
1498
1499 static ssize_t sel_read_sidtab_hash_stats(struct file *filp, char __user *buf,
1500 size_t count, loff_t *ppos)
1501 {
1502 struct selinux_fs_info *fsi = file_inode(filp)->i_sb->s_fs_info;
1503 struct selinux_state *state = fsi->state;
1504 char *page;
1505 ssize_t length;
1506
1507 page = (char *)__get_free_page(GFP_KERNEL);
1508 if (!page)
1509 return -ENOMEM;
1510
1511 length = security_sidtab_hash_stats(state, page);
1512 if (length >= 0)
1513 length = simple_read_from_buffer(buf, count, ppos, page,
1514 length);
1515 free_page((unsigned long)page);
1516
1517 return length;
1518 }
1519
1520 static const struct file_operations sel_sidtab_hash_stats_ops = {
1521 .read = sel_read_sidtab_hash_stats,
1522 .llseek = generic_file_llseek,
1523 };
1524
1525 static const struct file_operations sel_avc_cache_threshold_ops = {
1526 .read = sel_read_avc_cache_threshold,
1527 .write = sel_write_avc_cache_threshold,
1528 .llseek = generic_file_llseek,
1529 };
1530
1531 static const struct file_operations sel_avc_hash_stats_ops = {
1532 .read = sel_read_avc_hash_stats,
1533 .llseek = generic_file_llseek,
1534 };
1535
1536 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1537 static struct avc_cache_stats *sel_avc_get_stat_idx(loff_t *idx)
1538 {
1539 int cpu;
1540
1541 for (cpu = *idx; cpu < nr_cpu_ids; ++cpu) {
1542 if (!cpu_possible(cpu))
1543 continue;
1544 *idx = cpu + 1;
1545 return &per_cpu(avc_cache_stats, cpu);
1546 }
1547 (*idx)++;
1548 return NULL;
1549 }
1550
1551 static void *sel_avc_stats_seq_start(struct seq_file *seq, loff_t *pos)
1552 {
1553 loff_t n = *pos - 1;
1554
1555 if (*pos == 0)
1556 return SEQ_START_TOKEN;
1557
1558 return sel_avc_get_stat_idx(&n);
1559 }
1560
1561 static void *sel_avc_stats_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1562 {
1563 return sel_avc_get_stat_idx(pos);
1564 }
1565
1566 static int sel_avc_stats_seq_show(struct seq_file *seq, void *v)
1567 {
1568 struct avc_cache_stats *st = v;
1569
1570 if (v == SEQ_START_TOKEN) {
1571 seq_puts(seq,
1572 "lookups hits misses allocations reclaims frees\n");
1573 } else {
1574 unsigned int lookups = st->lookups;
1575 unsigned int misses = st->misses;
1576 unsigned int hits = lookups - misses;
1577 seq_printf(seq, "%u %u %u %u %u %u\n", lookups,
1578 hits, misses, st->allocations,
1579 st->reclaims, st->frees);
1580 }
1581 return 0;
1582 }
1583
1584 static void sel_avc_stats_seq_stop(struct seq_file *seq, void *v)
1585 { }
1586
1587 static const struct seq_operations sel_avc_cache_stats_seq_ops = {
1588 .start = sel_avc_stats_seq_start,
1589 .next = sel_avc_stats_seq_next,
1590 .show = sel_avc_stats_seq_show,
1591 .stop = sel_avc_stats_seq_stop,
1592 };
1593
1594 static int sel_open_avc_cache_stats(struct inode *inode, struct file *file)
1595 {
1596 return seq_open(file, &sel_avc_cache_stats_seq_ops);
1597 }
1598
1599 static const struct file_operations sel_avc_cache_stats_ops = {
1600 .open = sel_open_avc_cache_stats,
1601 .read = seq_read,
1602 .llseek = seq_lseek,
1603 .release = seq_release,
1604 };
1605 #endif
1606
1607 static int sel_make_avc_files(struct dentry *dir)
1608 {
1609 struct super_block *sb = dir->d_sb;
1610 struct selinux_fs_info *fsi = sb->s_fs_info;
1611 int i;
1612 static const struct tree_descr files[] = {
1613 { "cache_threshold",
1614 &sel_avc_cache_threshold_ops, S_IRUGO|S_IWUSR },
1615 { "hash_stats", &sel_avc_hash_stats_ops, S_IRUGO },
1616 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1617 { "cache_stats", &sel_avc_cache_stats_ops, S_IRUGO },
1618 #endif
1619 };
1620
1621 for (i = 0; i < ARRAY_SIZE(files); i++) {
1622 struct inode *inode;
1623 struct dentry *dentry;
1624
1625 dentry = d_alloc_name(dir, files[i].name);
1626 if (!dentry)
1627 return -ENOMEM;
1628
1629 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1630 if (!inode) {
1631 dput(dentry);
1632 return -ENOMEM;
1633 }
1634
1635 inode->i_fop = files[i].ops;
1636 inode->i_ino = ++fsi->last_ino;
1637 d_add(dentry, inode);
1638 }
1639
1640 return 0;
1641 }
1642
1643 static int sel_make_ss_files(struct dentry *dir)
1644 {
1645 struct super_block *sb = dir->d_sb;
1646 struct selinux_fs_info *fsi = sb->s_fs_info;
1647 int i;
1648 static struct tree_descr files[] = {
1649 { "sidtab_hash_stats", &sel_sidtab_hash_stats_ops, S_IRUGO },
1650 };
1651
1652 for (i = 0; i < ARRAY_SIZE(files); i++) {
1653 struct inode *inode;
1654 struct dentry *dentry;
1655
1656 dentry = d_alloc_name(dir, files[i].name);
1657 if (!dentry)
1658 return -ENOMEM;
1659
1660 inode = sel_make_inode(dir->d_sb, S_IFREG|files[i].mode);
1661 if (!inode) {
1662 dput(dentry);
1663 return -ENOMEM;
1664 }
1665
1666 inode->i_fop = files[i].ops;
1667 inode->i_ino = ++fsi->last_ino;
1668 d_add(dentry, inode);
1669 }
1670
1671 return 0;
1672 }
1673
1674 static ssize_t sel_read_initcon(struct file *file, char __user *buf,
1675 size_t count, loff_t *ppos)
1676 {
1677 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1678 char *con;
1679 u32 sid, len;
1680 ssize_t ret;
1681
1682 sid = file_inode(file)->i_ino&SEL_INO_MASK;
1683 ret = security_sid_to_context(fsi->state, sid, &con, &len);
1684 if (ret)
1685 return ret;
1686
1687 ret = simple_read_from_buffer(buf, count, ppos, con, len);
1688 kfree(con);
1689 return ret;
1690 }
1691
1692 static const struct file_operations sel_initcon_ops = {
1693 .read = sel_read_initcon,
1694 .llseek = generic_file_llseek,
1695 };
1696
1697 static int sel_make_initcon_files(struct dentry *dir)
1698 {
1699 int i;
1700
1701 for (i = 1; i <= SECINITSID_NUM; i++) {
1702 struct inode *inode;
1703 struct dentry *dentry;
1704 const char *s = security_get_initial_sid_context(i);
1705
1706 if (!s)
1707 continue;
1708 dentry = d_alloc_name(dir, s);
1709 if (!dentry)
1710 return -ENOMEM;
1711
1712 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1713 if (!inode) {
1714 dput(dentry);
1715 return -ENOMEM;
1716 }
1717
1718 inode->i_fop = &sel_initcon_ops;
1719 inode->i_ino = i|SEL_INITCON_INO_OFFSET;
1720 d_add(dentry, inode);
1721 }
1722
1723 return 0;
1724 }
1725
1726 static inline unsigned long sel_class_to_ino(u16 class)
1727 {
1728 return (class * (SEL_VEC_MAX + 1)) | SEL_CLASS_INO_OFFSET;
1729 }
1730
1731 static inline u16 sel_ino_to_class(unsigned long ino)
1732 {
1733 return (ino & SEL_INO_MASK) / (SEL_VEC_MAX + 1);
1734 }
1735
1736 static inline unsigned long sel_perm_to_ino(u16 class, u32 perm)
1737 {
1738 return (class * (SEL_VEC_MAX + 1) + perm) | SEL_CLASS_INO_OFFSET;
1739 }
1740
1741 static inline u32 sel_ino_to_perm(unsigned long ino)
1742 {
1743 return (ino & SEL_INO_MASK) % (SEL_VEC_MAX + 1);
1744 }
1745
1746 static ssize_t sel_read_class(struct file *file, char __user *buf,
1747 size_t count, loff_t *ppos)
1748 {
1749 unsigned long ino = file_inode(file)->i_ino;
1750 char res[TMPBUFLEN];
1751 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
1752 return simple_read_from_buffer(buf, count, ppos, res, len);
1753 }
1754
1755 static const struct file_operations sel_class_ops = {
1756 .read = sel_read_class,
1757 .llseek = generic_file_llseek,
1758 };
1759
1760 static ssize_t sel_read_perm(struct file *file, char __user *buf,
1761 size_t count, loff_t *ppos)
1762 {
1763 unsigned long ino = file_inode(file)->i_ino;
1764 char res[TMPBUFLEN];
1765 ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
1766 return simple_read_from_buffer(buf, count, ppos, res, len);
1767 }
1768
1769 static const struct file_operations sel_perm_ops = {
1770 .read = sel_read_perm,
1771 .llseek = generic_file_llseek,
1772 };
1773
1774 static ssize_t sel_read_policycap(struct file *file, char __user *buf,
1775 size_t count, loff_t *ppos)
1776 {
1777 struct selinux_fs_info *fsi = file_inode(file)->i_sb->s_fs_info;
1778 int value;
1779 char tmpbuf[TMPBUFLEN];
1780 ssize_t length;
1781 unsigned long i_ino = file_inode(file)->i_ino;
1782
1783 value = security_policycap_supported(fsi->state, i_ino & SEL_INO_MASK);
1784 length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
1785
1786 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1787 }
1788
1789 static const struct file_operations sel_policycap_ops = {
1790 .read = sel_read_policycap,
1791 .llseek = generic_file_llseek,
1792 };
1793
1794 static int sel_make_perm_files(char *objclass, int classvalue,
1795 struct dentry *dir)
1796 {
1797 struct selinux_fs_info *fsi = dir->d_sb->s_fs_info;
1798 int i, rc, nperms;
1799 char **perms;
1800
1801 rc = security_get_permissions(fsi->state, objclass, &perms, &nperms);
1802 if (rc)
1803 return rc;
1804
1805 for (i = 0; i < nperms; i++) {
1806 struct inode *inode;
1807 struct dentry *dentry;
1808
1809 rc = -ENOMEM;
1810 dentry = d_alloc_name(dir, perms[i]);
1811 if (!dentry)
1812 goto out;
1813
1814 rc = -ENOMEM;
1815 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1816 if (!inode) {
1817 dput(dentry);
1818 goto out;
1819 }
1820
1821 inode->i_fop = &sel_perm_ops;
1822 /* i+1 since perm values are 1-indexed */
1823 inode->i_ino = sel_perm_to_ino(classvalue, i + 1);
1824 d_add(dentry, inode);
1825 }
1826 rc = 0;
1827 out:
1828 for (i = 0; i < nperms; i++)
1829 kfree(perms[i]);
1830 kfree(perms);
1831 return rc;
1832 }
1833
1834 static int sel_make_class_dir_entries(char *classname, int index,
1835 struct dentry *dir)
1836 {
1837 struct super_block *sb = dir->d_sb;
1838 struct selinux_fs_info *fsi = sb->s_fs_info;
1839 struct dentry *dentry = NULL;
1840 struct inode *inode = NULL;
1841 int rc;
1842
1843 dentry = d_alloc_name(dir, "index");
1844 if (!dentry)
1845 return -ENOMEM;
1846
1847 inode = sel_make_inode(dir->d_sb, S_IFREG|S_IRUGO);
1848 if (!inode) {
1849 dput(dentry);
1850 return -ENOMEM;
1851 }
1852
1853 inode->i_fop = &sel_class_ops;
1854 inode->i_ino = sel_class_to_ino(index);
1855 d_add(dentry, inode);
1856
1857 dentry = sel_make_dir(dir, "perms", &fsi->last_class_ino);
1858 if (IS_ERR(dentry))
1859 return PTR_ERR(dentry);
1860
1861 rc = sel_make_perm_files(classname, index, dentry);
1862
1863 return rc;
1864 }
1865
1866 static int sel_make_classes(struct selinux_fs_info *fsi)
1867 {
1868
1869 int rc, nclasses, i;
1870 char **classes;
1871
1872 /* delete any existing entries */
1873 sel_remove_entries(fsi->class_dir);
1874
1875 rc = security_get_classes(fsi->state, &classes, &nclasses);
1876 if (rc)
1877 return rc;
1878
1879 /* +2 since classes are 1-indexed */
1880 fsi->last_class_ino = sel_class_to_ino(nclasses + 2);
1881
1882 for (i = 0; i < nclasses; i++) {
1883 struct dentry *class_name_dir;
1884
1885 class_name_dir = sel_make_dir(fsi->class_dir, classes[i],
1886 &fsi->last_class_ino);
1887 if (IS_ERR(class_name_dir)) {
1888 rc = PTR_ERR(class_name_dir);
1889 goto out;
1890 }
1891
1892 /* i+1 since class values are 1-indexed */
1893 rc = sel_make_class_dir_entries(classes[i], i + 1,
1894 class_name_dir);
1895 if (rc)
1896 goto out;
1897 }
1898 rc = 0;
1899 out:
1900 for (i = 0; i < nclasses; i++)
1901 kfree(classes[i]);
1902 kfree(classes);
1903 return rc;
1904 }
1905
1906 static int sel_make_policycap(struct selinux_fs_info *fsi)
1907 {
1908 unsigned int iter;
1909 struct dentry *dentry = NULL;
1910 struct inode *inode = NULL;
1911
1912 sel_remove_entries(fsi->policycap_dir);
1913
1914 for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
1915 if (iter < ARRAY_SIZE(selinux_policycap_names))
1916 dentry = d_alloc_name(fsi->policycap_dir,
1917 selinux_policycap_names[iter]);
1918 else
1919 dentry = d_alloc_name(fsi->policycap_dir, "unknown");
1920
1921 if (dentry == NULL)
1922 return -ENOMEM;
1923
1924 inode = sel_make_inode(fsi->sb, S_IFREG | 0444);
1925 if (inode == NULL) {
1926 dput(dentry);
1927 return -ENOMEM;
1928 }
1929
1930 inode->i_fop = &sel_policycap_ops;
1931 inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
1932 d_add(dentry, inode);
1933 }
1934
1935 return 0;
1936 }
1937
1938 static struct dentry *sel_make_dir(struct dentry *dir, const char *name,
1939 unsigned long *ino)
1940 {
1941 struct dentry *dentry = d_alloc_name(dir, name);
1942 struct inode *inode;
1943
1944 if (!dentry)
1945 return ERR_PTR(-ENOMEM);
1946
1947 inode = sel_make_inode(dir->d_sb, S_IFDIR | S_IRUGO | S_IXUGO);
1948 if (!inode) {
1949 dput(dentry);
1950 return ERR_PTR(-ENOMEM);
1951 }
1952
1953 inode->i_op = &simple_dir_inode_operations;
1954 inode->i_fop = &simple_dir_operations;
1955 inode->i_ino = ++(*ino);
1956 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1957 inc_nlink(inode);
1958 d_add(dentry, inode);
1959 /* bump link count on parent directory, too */
1960 inc_nlink(d_inode(dir));
1961
1962 return dentry;
1963 }
1964
1965 #define NULL_FILE_NAME "null"
1966
1967 static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
1968 {
1969 struct selinux_fs_info *fsi;
1970 int ret;
1971 struct dentry *dentry;
1972 struct inode *inode;
1973 struct inode_security_struct *isec;
1974
1975 static const struct tree_descr selinux_files[] = {
1976 [SEL_LOAD] = {"load", &sel_load_ops, S_IRUSR|S_IWUSR},
1977 [SEL_ENFORCE] = {"enforce", &sel_enforce_ops, S_IRUGO|S_IWUSR},
1978 [SEL_CONTEXT] = {"context", &transaction_ops, S_IRUGO|S_IWUGO},
1979 [SEL_ACCESS] = {"access", &transaction_ops, S_IRUGO|S_IWUGO},
1980 [SEL_CREATE] = {"create", &transaction_ops, S_IRUGO|S_IWUGO},
1981 [SEL_RELABEL] = {"relabel", &transaction_ops, S_IRUGO|S_IWUGO},
1982 [SEL_USER] = {"user", &transaction_ops, S_IRUGO|S_IWUGO},
1983 [SEL_POLICYVERS] = {"policyvers", &sel_policyvers_ops, S_IRUGO},
1984 [SEL_COMMIT_BOOLS] = {"commit_pending_bools", &sel_commit_bools_ops, S_IWUSR},
1985 [SEL_MLS] = {"mls", &sel_mls_ops, S_IRUGO},
1986 [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
1987 [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
1988 [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
1989 [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
1990 [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
1991 [SEL_STATUS] = {"status", &sel_handle_status_ops, S_IRUGO},
1992 [SEL_POLICY] = {"policy", &sel_policy_ops, S_IRUGO},
1993 [SEL_VALIDATE_TRANS] = {"validatetrans", &sel_transition_ops,
1994 S_IWUGO},
1995 /* last one */ {""}
1996 };
1997
1998 ret = selinux_fs_info_create(sb);
1999 if (ret)
2000 goto err;
2001
2002 ret = simple_fill_super(sb, SELINUX_MAGIC, selinux_files);
2003 if (ret)
2004 goto err;
2005
2006 fsi = sb->s_fs_info;
2007 fsi->bool_dir = sel_make_dir(sb->s_root, BOOL_DIR_NAME, &fsi->last_ino);
2008 if (IS_ERR(fsi->bool_dir)) {
2009 ret = PTR_ERR(fsi->bool_dir);
2010 fsi->bool_dir = NULL;
2011 goto err;
2012 }
2013
2014 ret = -ENOMEM;
2015 dentry = d_alloc_name(sb->s_root, NULL_FILE_NAME);
2016 if (!dentry)
2017 goto err;
2018
2019 ret = -ENOMEM;
2020 inode = sel_make_inode(sb, S_IFCHR | S_IRUGO | S_IWUGO);
2021 if (!inode) {
2022 dput(dentry);
2023 goto err;
2024 }
2025
2026 inode->i_ino = ++fsi->last_ino;
2027 isec = selinux_inode(inode);
2028 isec->sid = SECINITSID_DEVNULL;
2029 isec->sclass = SECCLASS_CHR_FILE;
2030 isec->initialized = LABEL_INITIALIZED;
2031
2032 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO, MKDEV(MEM_MAJOR, 3));
2033 d_add(dentry, inode);
2034
2035 dentry = sel_make_dir(sb->s_root, "avc", &fsi->last_ino);
2036 if (IS_ERR(dentry)) {
2037 ret = PTR_ERR(dentry);
2038 goto err;
2039 }
2040
2041 ret = sel_make_avc_files(dentry);
2042
2043 dentry = sel_make_dir(sb->s_root, "ss", &fsi->last_ino);
2044 if (IS_ERR(dentry)) {
2045 ret = PTR_ERR(dentry);
2046 goto err;
2047 }
2048
2049 ret = sel_make_ss_files(dentry);
2050 if (ret)
2051 goto err;
2052
2053 dentry = sel_make_dir(sb->s_root, "initial_contexts", &fsi->last_ino);
2054 if (IS_ERR(dentry)) {
2055 ret = PTR_ERR(dentry);
2056 goto err;
2057 }
2058
2059 ret = sel_make_initcon_files(dentry);
2060 if (ret)
2061 goto err;
2062
2063 fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
2064 if (IS_ERR(fsi->class_dir)) {
2065 ret = PTR_ERR(fsi->class_dir);
2066 fsi->class_dir = NULL;
2067 goto err;
2068 }
2069
2070 fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
2071 &fsi->last_ino);
2072 if (IS_ERR(fsi->policycap_dir)) {
2073 ret = PTR_ERR(fsi->policycap_dir);
2074 fsi->policycap_dir = NULL;
2075 goto err;
2076 }
2077
2078 ret = sel_make_policy_nodes(fsi);
2079 if (ret)
2080 goto err;
2081 return 0;
2082 err:
2083 pr_err("SELinux: %s: failed while creating inodes\n",
2084 __func__);
2085
2086 selinux_fs_info_free(sb);
2087
2088 return ret;
2089 }
2090
2091 static int sel_get_tree(struct fs_context *fc)
2092 {
2093 return get_tree_single(fc, sel_fill_super);
2094 }
2095
2096 static const struct fs_context_operations sel_context_ops = {
2097 .get_tree = sel_get_tree,
2098 };
2099
2100 static int sel_init_fs_context(struct fs_context *fc)
2101 {
2102 fc->ops = &sel_context_ops;
2103 return 0;
2104 }
2105
2106 static void sel_kill_sb(struct super_block *sb)
2107 {
2108 selinux_fs_info_free(sb);
2109 kill_litter_super(sb);
2110 }
2111
2112 static struct file_system_type sel_fs_type = {
2113 .name = "selinuxfs",
2114 .init_fs_context = sel_init_fs_context,
2115 .kill_sb = sel_kill_sb,
2116 };
2117
2118 struct vfsmount *selinuxfs_mount;
2119 struct path selinux_null;
2120
2121 static int __init init_sel_fs(void)
2122 {
2123 struct qstr null_name = QSTR_INIT(NULL_FILE_NAME,
2124 sizeof(NULL_FILE_NAME)-1);
2125 int err;
2126
2127 if (!selinux_enabled_boot)
2128 return 0;
2129
2130 err = sysfs_create_mount_point(fs_kobj, "selinux");
2131 if (err)
2132 return err;
2133
2134 err = register_filesystem(&sel_fs_type);
2135 if (err) {
2136 sysfs_remove_mount_point(fs_kobj, "selinux");
2137 return err;
2138 }
2139
2140 selinux_null.mnt = selinuxfs_mount = kern_mount(&sel_fs_type);
2141 if (IS_ERR(selinuxfs_mount)) {
2142 pr_err("selinuxfs: could not mount!\n");
2143 err = PTR_ERR(selinuxfs_mount);
2144 selinuxfs_mount = NULL;
2145 }
2146 selinux_null.dentry = d_hash_and_lookup(selinux_null.mnt->mnt_root,
2147 &null_name);
2148 if (IS_ERR(selinux_null.dentry)) {
2149 pr_err("selinuxfs: could not lookup null!\n");
2150 err = PTR_ERR(selinux_null.dentry);
2151 selinux_null.dentry = NULL;
2152 }
2153
2154 return err;
2155 }
2156
2157 __initcall(init_sel_fs);
2158
2159 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2160 void exit_sel_fs(void)
2161 {
2162 sysfs_remove_mount_point(fs_kobj, "selinux");
2163 dput(selinux_null.dentry);
2164 kern_unmount(selinuxfs_mount);
2165 unregister_filesystem(&sel_fs_type);
2166 }
2167 #endif
Linux with added FPC-III support