1 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
3 * Added conditional policy language extensions
5 * Updated: Hewlett-Packard <paul@paul-moore.com>
7 * Added support for the policy capability bitmap
9 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
10 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
11 * Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation, version 2.
17 #include <linux/kernel.h>
18 #include <linux/pagemap.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.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>
34 /* selinuxfs pseudo filesystem for exporting the security policy API.
35 Based on the proc code and the fs/nfsd/nfsctl.c code. */
42 #include "conditional.h"
44 /* Policy capability filenames */
45 static char *policycap_names
[] = {
46 "network_peer_controls",
49 "always_check_network"
52 unsigned int selinux_checkreqprot
= CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE
;
54 static int __init
checkreqprot_setup(char *str
)
56 unsigned long checkreqprot
;
57 if (!kstrtoul(str
, 0, &checkreqprot
))
58 selinux_checkreqprot
= checkreqprot
? 1 : 0;
61 __setup("checkreqprot=", checkreqprot_setup
);
63 static DEFINE_MUTEX(sel_mutex
);
65 /* global data for booleans */
66 static struct dentry
*bool_dir
;
68 static char **bool_pending_names
;
69 static int *bool_pending_values
;
71 /* global data for classes */
72 static struct dentry
*class_dir
;
73 static unsigned long last_class_ino
;
75 static char policy_opened
;
77 /* global data for policy capabilities */
78 static struct dentry
*policycap_dir
;
80 /* Check whether a task is allowed to use a security operation. */
81 static int task_has_security(struct task_struct
*tsk
,
84 const struct task_security_struct
*tsec
;
88 tsec
= __task_cred(tsk
)->security
;
95 return avc_has_perm(sid
, SECINITSID_SECURITY
,
96 SECCLASS_SECURITY
, perms
, NULL
);
101 SEL_LOAD
, /* load policy */
102 SEL_ENFORCE
, /* get or set enforcing status */
103 SEL_CONTEXT
, /* validate context */
104 SEL_ACCESS
, /* compute access decision */
105 SEL_CREATE
, /* compute create labeling decision */
106 SEL_RELABEL
, /* compute relabeling decision */
107 SEL_USER
, /* compute reachable user contexts */
108 SEL_POLICYVERS
, /* return policy version for this kernel */
109 SEL_COMMIT_BOOLS
, /* commit new boolean values */
110 SEL_MLS
, /* return if MLS policy is enabled */
111 SEL_DISABLE
, /* disable SELinux until next reboot */
112 SEL_MEMBER
, /* compute polyinstantiation membership decision */
113 SEL_CHECKREQPROT
, /* check requested protection, not kernel-applied one */
114 SEL_COMPAT_NET
, /* whether to use old compat network packet controls */
115 SEL_REJECT_UNKNOWN
, /* export unknown reject handling to userspace */
116 SEL_DENY_UNKNOWN
, /* export unknown deny handling to userspace */
117 SEL_STATUS
, /* export current status using mmap() */
118 SEL_POLICY
, /* allow userspace to read the in kernel policy */
119 SEL_VALIDATE_TRANS
, /* compute validatetrans decision */
120 SEL_INO_NEXT
, /* The next inode number to use */
123 static unsigned long sel_last_ino
= SEL_INO_NEXT
- 1;
125 #define SEL_INITCON_INO_OFFSET 0x01000000
126 #define SEL_BOOL_INO_OFFSET 0x02000000
127 #define SEL_CLASS_INO_OFFSET 0x04000000
128 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
129 #define SEL_INO_MASK 0x00ffffff
132 static ssize_t
sel_read_enforce(struct file
*filp
, char __user
*buf
,
133 size_t count
, loff_t
*ppos
)
135 char tmpbuf
[TMPBUFLEN
];
138 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d", selinux_enforcing
);
139 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
142 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
143 static ssize_t
sel_write_enforce(struct file
*file
, const char __user
*buf
,
144 size_t count
, loff_t
*ppos
)
151 if (count
>= PAGE_SIZE
)
154 /* No partial writes. */
158 page
= memdup_user_nul(buf
, count
);
160 return PTR_ERR(page
);
163 if (sscanf(page
, "%d", &new_value
) != 1)
166 new_value
= !!new_value
;
168 if (new_value
!= selinux_enforcing
) {
169 length
= task_has_security(current
, SECURITY__SETENFORCE
);
172 audit_log(current
->audit_context
, GFP_KERNEL
, AUDIT_MAC_STATUS
,
173 "enforcing=%d old_enforcing=%d auid=%u ses=%u",
174 new_value
, selinux_enforcing
,
175 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
176 audit_get_sessionid(current
));
177 selinux_enforcing
= new_value
;
178 if (selinux_enforcing
)
180 selnl_notify_setenforce(selinux_enforcing
);
181 selinux_status_update_setenforce(selinux_enforcing
);
189 #define sel_write_enforce NULL
192 static const struct file_operations sel_enforce_ops
= {
193 .read
= sel_read_enforce
,
194 .write
= sel_write_enforce
,
195 .llseek
= generic_file_llseek
,
198 static ssize_t
sel_read_handle_unknown(struct file
*filp
, char __user
*buf
,
199 size_t count
, loff_t
*ppos
)
201 char tmpbuf
[TMPBUFLEN
];
203 ino_t ino
= file_inode(filp
)->i_ino
;
204 int handle_unknown
= (ino
== SEL_REJECT_UNKNOWN
) ?
205 security_get_reject_unknown() : !security_get_allow_unknown();
207 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d", handle_unknown
);
208 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
211 static const struct file_operations sel_handle_unknown_ops
= {
212 .read
= sel_read_handle_unknown
,
213 .llseek
= generic_file_llseek
,
216 static int sel_open_handle_status(struct inode
*inode
, struct file
*filp
)
218 struct page
*status
= selinux_kernel_status_page();
223 filp
->private_data
= status
;
228 static ssize_t
sel_read_handle_status(struct file
*filp
, char __user
*buf
,
229 size_t count
, loff_t
*ppos
)
231 struct page
*status
= filp
->private_data
;
235 return simple_read_from_buffer(buf
, count
, ppos
,
236 page_address(status
),
237 sizeof(struct selinux_kernel_status
));
240 static int sel_mmap_handle_status(struct file
*filp
,
241 struct vm_area_struct
*vma
)
243 struct page
*status
= filp
->private_data
;
244 unsigned long size
= vma
->vm_end
- vma
->vm_start
;
248 /* only allows one page from the head */
249 if (vma
->vm_pgoff
> 0 || size
!= PAGE_SIZE
)
251 /* disallow writable mapping */
252 if (vma
->vm_flags
& VM_WRITE
)
254 /* disallow mprotect() turns it into writable */
255 vma
->vm_flags
&= ~VM_MAYWRITE
;
257 return remap_pfn_range(vma
, vma
->vm_start
,
259 size
, vma
->vm_page_prot
);
262 static const struct file_operations sel_handle_status_ops
= {
263 .open
= sel_open_handle_status
,
264 .read
= sel_read_handle_status
,
265 .mmap
= sel_mmap_handle_status
,
266 .llseek
= generic_file_llseek
,
269 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
270 static ssize_t
sel_write_disable(struct file
*file
, const char __user
*buf
,
271 size_t count
, loff_t
*ppos
)
278 if (count
>= PAGE_SIZE
)
281 /* No partial writes. */
285 page
= memdup_user_nul(buf
, count
);
287 return PTR_ERR(page
);
290 if (sscanf(page
, "%d", &new_value
) != 1)
294 length
= selinux_disable();
297 audit_log(current
->audit_context
, GFP_KERNEL
, AUDIT_MAC_STATUS
,
298 "selinux=0 auid=%u ses=%u",
299 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
300 audit_get_sessionid(current
));
309 #define sel_write_disable NULL
312 static const struct file_operations sel_disable_ops
= {
313 .write
= sel_write_disable
,
314 .llseek
= generic_file_llseek
,
317 static ssize_t
sel_read_policyvers(struct file
*filp
, char __user
*buf
,
318 size_t count
, loff_t
*ppos
)
320 char tmpbuf
[TMPBUFLEN
];
323 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u", POLICYDB_VERSION_MAX
);
324 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
327 static const struct file_operations sel_policyvers_ops
= {
328 .read
= sel_read_policyvers
,
329 .llseek
= generic_file_llseek
,
332 /* declaration for sel_write_load */
333 static int sel_make_bools(void);
334 static int sel_make_classes(void);
335 static int sel_make_policycap(void);
337 /* declaration for sel_make_class_dirs */
338 static struct dentry
*sel_make_dir(struct dentry
*dir
, const char *name
,
341 static ssize_t
sel_read_mls(struct file
*filp
, char __user
*buf
,
342 size_t count
, loff_t
*ppos
)
344 char tmpbuf
[TMPBUFLEN
];
347 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d",
348 security_mls_enabled());
349 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
352 static const struct file_operations sel_mls_ops
= {
353 .read
= sel_read_mls
,
354 .llseek
= generic_file_llseek
,
357 struct policy_load_memory
{
362 static int sel_open_policy(struct inode
*inode
, struct file
*filp
)
364 struct policy_load_memory
*plm
= NULL
;
367 BUG_ON(filp
->private_data
);
369 mutex_lock(&sel_mutex
);
371 rc
= task_has_security(current
, SECURITY__READ_POLICY
);
380 plm
= kzalloc(sizeof(*plm
), GFP_KERNEL
);
384 if (i_size_read(inode
) != security_policydb_len()) {
386 i_size_write(inode
, security_policydb_len());
390 rc
= security_read_policy(&plm
->data
, &plm
->len
);
396 filp
->private_data
= plm
;
398 mutex_unlock(&sel_mutex
);
402 mutex_unlock(&sel_mutex
);
410 static int sel_release_policy(struct inode
*inode
, struct file
*filp
)
412 struct policy_load_memory
*plm
= filp
->private_data
;
424 static ssize_t
sel_read_policy(struct file
*filp
, char __user
*buf
,
425 size_t count
, loff_t
*ppos
)
427 struct policy_load_memory
*plm
= filp
->private_data
;
430 mutex_lock(&sel_mutex
);
432 ret
= task_has_security(current
, SECURITY__READ_POLICY
);
436 ret
= simple_read_from_buffer(buf
, count
, ppos
, plm
->data
, plm
->len
);
438 mutex_unlock(&sel_mutex
);
442 static int sel_mmap_policy_fault(struct vm_area_struct
*vma
,
443 struct vm_fault
*vmf
)
445 struct policy_load_memory
*plm
= vma
->vm_file
->private_data
;
446 unsigned long offset
;
449 if (vmf
->flags
& (FAULT_FLAG_MKWRITE
| FAULT_FLAG_WRITE
))
450 return VM_FAULT_SIGBUS
;
452 offset
= vmf
->pgoff
<< PAGE_SHIFT
;
453 if (offset
>= roundup(plm
->len
, PAGE_SIZE
))
454 return VM_FAULT_SIGBUS
;
456 page
= vmalloc_to_page(plm
->data
+ offset
);
464 static const struct vm_operations_struct sel_mmap_policy_ops
= {
465 .fault
= sel_mmap_policy_fault
,
466 .page_mkwrite
= sel_mmap_policy_fault
,
469 static int sel_mmap_policy(struct file
*filp
, struct vm_area_struct
*vma
)
471 if (vma
->vm_flags
& VM_SHARED
) {
472 /* do not allow mprotect to make mapping writable */
473 vma
->vm_flags
&= ~VM_MAYWRITE
;
475 if (vma
->vm_flags
& VM_WRITE
)
479 vma
->vm_flags
|= VM_DONTEXPAND
| VM_DONTDUMP
;
480 vma
->vm_ops
= &sel_mmap_policy_ops
;
485 static const struct file_operations sel_policy_ops
= {
486 .open
= sel_open_policy
,
487 .read
= sel_read_policy
,
488 .mmap
= sel_mmap_policy
,
489 .release
= sel_release_policy
,
490 .llseek
= generic_file_llseek
,
493 static ssize_t
sel_write_load(struct file
*file
, const char __user
*buf
,
494 size_t count
, loff_t
*ppos
)
500 mutex_lock(&sel_mutex
);
502 length
= task_has_security(current
, SECURITY__LOAD_POLICY
);
506 /* No partial writes. */
512 if (count
> 64 * 1024 * 1024)
516 data
= vmalloc(count
);
521 if (copy_from_user(data
, buf
, count
) != 0)
524 length
= security_load_policy(data
, count
);
528 length
= sel_make_bools();
532 length
= sel_make_classes();
536 length
= sel_make_policycap();
543 audit_log(current
->audit_context
, GFP_KERNEL
, AUDIT_MAC_POLICY_LOAD
,
544 "policy loaded auid=%u ses=%u",
545 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
546 audit_get_sessionid(current
));
548 mutex_unlock(&sel_mutex
);
553 static const struct file_operations sel_load_ops
= {
554 .write
= sel_write_load
,
555 .llseek
= generic_file_llseek
,
558 static ssize_t
sel_write_context(struct file
*file
, char *buf
, size_t size
)
564 length
= task_has_security(current
, SECURITY__CHECK_CONTEXT
);
568 length
= security_context_to_sid(buf
, size
, &sid
, GFP_KERNEL
);
572 length
= security_sid_to_context(sid
, &canon
, &len
);
577 if (len
> SIMPLE_TRANSACTION_LIMIT
) {
578 printk(KERN_ERR
"SELinux: %s: context size (%u) exceeds "
579 "payload max\n", __func__
, len
);
583 memcpy(buf
, canon
, len
);
590 static ssize_t
sel_read_checkreqprot(struct file
*filp
, char __user
*buf
,
591 size_t count
, loff_t
*ppos
)
593 char tmpbuf
[TMPBUFLEN
];
596 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u", selinux_checkreqprot
);
597 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
600 static ssize_t
sel_write_checkreqprot(struct file
*file
, const char __user
*buf
,
601 size_t count
, loff_t
*ppos
)
605 unsigned int new_value
;
607 length
= task_has_security(current
, SECURITY__SETCHECKREQPROT
);
611 if (count
>= PAGE_SIZE
)
614 /* No partial writes. */
618 page
= memdup_user_nul(buf
, count
);
620 return PTR_ERR(page
);
623 if (sscanf(page
, "%u", &new_value
) != 1)
626 selinux_checkreqprot
= new_value
? 1 : 0;
632 static const struct file_operations sel_checkreqprot_ops
= {
633 .read
= sel_read_checkreqprot
,
634 .write
= sel_write_checkreqprot
,
635 .llseek
= generic_file_llseek
,
638 static ssize_t
sel_write_validatetrans(struct file
*file
,
639 const char __user
*buf
,
640 size_t count
, loff_t
*ppos
)
642 char *oldcon
= NULL
, *newcon
= NULL
, *taskcon
= NULL
;
644 u32 osid
, nsid
, tsid
;
648 rc
= task_has_security(current
, SECURITY__VALIDATE_TRANS
);
653 if (count
>= PAGE_SIZE
)
656 /* No partial writes. */
662 req
= kzalloc(count
+ 1, GFP_KERNEL
);
667 if (copy_from_user(req
, buf
, count
))
671 oldcon
= kzalloc(count
+ 1, GFP_KERNEL
);
675 newcon
= kzalloc(count
+ 1, GFP_KERNEL
);
679 taskcon
= kzalloc(count
+ 1, GFP_KERNEL
);
684 if (sscanf(req
, "%s %s %hu %s", oldcon
, newcon
, &tclass
, taskcon
) != 4)
687 rc
= security_context_str_to_sid(oldcon
, &osid
, GFP_KERNEL
);
691 rc
= security_context_str_to_sid(newcon
, &nsid
, GFP_KERNEL
);
695 rc
= security_context_str_to_sid(taskcon
, &tsid
, GFP_KERNEL
);
699 rc
= security_validate_transition_user(osid
, nsid
, tsid
, tclass
);
710 static const struct file_operations sel_transition_ops
= {
711 .write
= sel_write_validatetrans
,
712 .llseek
= generic_file_llseek
,
716 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
718 static ssize_t
sel_write_access(struct file
*file
, char *buf
, size_t size
);
719 static ssize_t
sel_write_create(struct file
*file
, char *buf
, size_t size
);
720 static ssize_t
sel_write_relabel(struct file
*file
, char *buf
, size_t size
);
721 static ssize_t
sel_write_user(struct file
*file
, char *buf
, size_t size
);
722 static ssize_t
sel_write_member(struct file
*file
, char *buf
, size_t size
);
724 static ssize_t (*write_op
[])(struct file
*, char *, size_t) = {
725 [SEL_ACCESS
] = sel_write_access
,
726 [SEL_CREATE
] = sel_write_create
,
727 [SEL_RELABEL
] = sel_write_relabel
,
728 [SEL_USER
] = sel_write_user
,
729 [SEL_MEMBER
] = sel_write_member
,
730 [SEL_CONTEXT
] = sel_write_context
,
733 static ssize_t
selinux_transaction_write(struct file
*file
, const char __user
*buf
, size_t size
, loff_t
*pos
)
735 ino_t ino
= file_inode(file
)->i_ino
;
739 if (ino
>= ARRAY_SIZE(write_op
) || !write_op
[ino
])
742 data
= simple_transaction_get(file
, buf
, size
);
744 return PTR_ERR(data
);
746 rv
= write_op
[ino
](file
, data
, size
);
748 simple_transaction_set(file
, rv
);
754 static const struct file_operations transaction_ops
= {
755 .write
= selinux_transaction_write
,
756 .read
= simple_transaction_read
,
757 .release
= simple_transaction_release
,
758 .llseek
= generic_file_llseek
,
762 * payload - write methods
763 * If the method has a response, the response should be put in buf,
764 * and the length returned. Otherwise return 0 or and -error.
767 static ssize_t
sel_write_access(struct file
*file
, char *buf
, size_t size
)
769 char *scon
= NULL
, *tcon
= NULL
;
772 struct av_decision avd
;
775 length
= task_has_security(current
, SECURITY__COMPUTE_AV
);
780 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
785 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
790 if (sscanf(buf
, "%s %s %hu", scon
, tcon
, &tclass
) != 3)
793 length
= security_context_str_to_sid(scon
, &ssid
, GFP_KERNEL
);
797 length
= security_context_str_to_sid(tcon
, &tsid
, GFP_KERNEL
);
801 security_compute_av_user(ssid
, tsid
, tclass
, &avd
);
803 length
= scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
,
805 avd
.allowed
, 0xffffffff,
806 avd
.auditallow
, avd
.auditdeny
,
807 avd
.seqno
, avd
.flags
);
814 static ssize_t
sel_write_create(struct file
*file
, char *buf
, size_t size
)
816 char *scon
= NULL
, *tcon
= NULL
;
817 char *namebuf
= NULL
, *objname
= NULL
;
818 u32 ssid
, tsid
, newsid
;
825 length
= task_has_security(current
, SECURITY__COMPUTE_CREATE
);
830 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
835 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
840 namebuf
= kzalloc(size
+ 1, GFP_KERNEL
);
845 nargs
= sscanf(buf
, "%s %s %hu %s", scon
, tcon
, &tclass
, namebuf
);
846 if (nargs
< 3 || nargs
> 4)
850 * If and when the name of new object to be queried contains
851 * either whitespace or multibyte characters, they shall be
852 * encoded based on the percentage-encoding rule.
853 * If not encoded, the sscanf logic picks up only left-half
854 * of the supplied name; splitted by a whitespace unexpectedly.
864 else if (c1
== '%') {
865 c1
= hex_to_bin(*r
++);
868 c2
= hex_to_bin(*r
++);
874 } while (c1
!= '\0');
879 length
= security_context_str_to_sid(scon
, &ssid
, GFP_KERNEL
);
883 length
= security_context_str_to_sid(tcon
, &tsid
, GFP_KERNEL
);
887 length
= security_transition_sid_user(ssid
, tsid
, tclass
,
892 length
= security_sid_to_context(newsid
, &newcon
, &len
);
897 if (len
> SIMPLE_TRANSACTION_LIMIT
) {
898 printk(KERN_ERR
"SELinux: %s: context size (%u) exceeds "
899 "payload max\n", __func__
, len
);
903 memcpy(buf
, newcon
, len
);
913 static ssize_t
sel_write_relabel(struct file
*file
, char *buf
, size_t size
)
915 char *scon
= NULL
, *tcon
= NULL
;
916 u32 ssid
, tsid
, newsid
;
922 length
= task_has_security(current
, SECURITY__COMPUTE_RELABEL
);
927 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
932 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
937 if (sscanf(buf
, "%s %s %hu", scon
, tcon
, &tclass
) != 3)
940 length
= security_context_str_to_sid(scon
, &ssid
, GFP_KERNEL
);
944 length
= security_context_str_to_sid(tcon
, &tsid
, GFP_KERNEL
);
948 length
= security_change_sid(ssid
, tsid
, tclass
, &newsid
);
952 length
= security_sid_to_context(newsid
, &newcon
, &len
);
957 if (len
> SIMPLE_TRANSACTION_LIMIT
)
960 memcpy(buf
, newcon
, len
);
969 static ssize_t
sel_write_user(struct file
*file
, char *buf
, size_t size
)
971 char *con
= NULL
, *user
= NULL
, *ptr
;
972 u32 sid
, *sids
= NULL
;
978 length
= task_has_security(current
, SECURITY__COMPUTE_USER
);
983 con
= kzalloc(size
+ 1, GFP_KERNEL
);
988 user
= kzalloc(size
+ 1, GFP_KERNEL
);
993 if (sscanf(buf
, "%s %s", con
, user
) != 2)
996 length
= security_context_str_to_sid(con
, &sid
, GFP_KERNEL
);
1000 length
= security_get_user_sids(sid
, user
, &sids
, &nsids
);
1004 length
= sprintf(buf
, "%u", nsids
) + 1;
1006 for (i
= 0; i
< nsids
; i
++) {
1007 rc
= security_sid_to_context(sids
[i
], &newcon
, &len
);
1012 if ((length
+ len
) >= SIMPLE_TRANSACTION_LIMIT
) {
1017 memcpy(ptr
, newcon
, len
);
1029 static ssize_t
sel_write_member(struct file
*file
, char *buf
, size_t size
)
1031 char *scon
= NULL
, *tcon
= NULL
;
1032 u32 ssid
, tsid
, newsid
;
1035 char *newcon
= NULL
;
1038 length
= task_has_security(current
, SECURITY__COMPUTE_MEMBER
);
1043 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
1048 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
1053 if (sscanf(buf
, "%s %s %hu", scon
, tcon
, &tclass
) != 3)
1056 length
= security_context_str_to_sid(scon
, &ssid
, GFP_KERNEL
);
1060 length
= security_context_str_to_sid(tcon
, &tsid
, GFP_KERNEL
);
1064 length
= security_member_sid(ssid
, tsid
, tclass
, &newsid
);
1068 length
= security_sid_to_context(newsid
, &newcon
, &len
);
1073 if (len
> SIMPLE_TRANSACTION_LIMIT
) {
1074 printk(KERN_ERR
"SELinux: %s: context size (%u) exceeds "
1075 "payload max\n", __func__
, len
);
1079 memcpy(buf
, newcon
, len
);
1088 static struct inode
*sel_make_inode(struct super_block
*sb
, int mode
)
1090 struct inode
*ret
= new_inode(sb
);
1094 ret
->i_atime
= ret
->i_mtime
= ret
->i_ctime
= current_time(ret
);
1099 static ssize_t
sel_read_bool(struct file
*filep
, char __user
*buf
,
1100 size_t count
, loff_t
*ppos
)
1106 unsigned index
= file_inode(filep
)->i_ino
& SEL_INO_MASK
;
1107 const char *name
= filep
->f_path
.dentry
->d_name
.name
;
1109 mutex_lock(&sel_mutex
);
1112 if (index
>= bool_num
|| strcmp(name
, bool_pending_names
[index
]))
1116 page
= (char *)get_zeroed_page(GFP_KERNEL
);
1120 cur_enforcing
= security_get_bool_value(index
);
1121 if (cur_enforcing
< 0) {
1122 ret
= cur_enforcing
;
1125 length
= scnprintf(page
, PAGE_SIZE
, "%d %d", cur_enforcing
,
1126 bool_pending_values
[index
]);
1127 ret
= simple_read_from_buffer(buf
, count
, ppos
, page
, length
);
1129 mutex_unlock(&sel_mutex
);
1130 free_page((unsigned long)page
);
1134 static ssize_t
sel_write_bool(struct file
*filep
, const char __user
*buf
,
1135 size_t count
, loff_t
*ppos
)
1140 unsigned index
= file_inode(filep
)->i_ino
& SEL_INO_MASK
;
1141 const char *name
= filep
->f_path
.dentry
->d_name
.name
;
1143 mutex_lock(&sel_mutex
);
1145 length
= task_has_security(current
, SECURITY__SETBOOL
);
1150 if (index
>= bool_num
|| strcmp(name
, bool_pending_names
[index
]))
1154 if (count
>= PAGE_SIZE
)
1157 /* No partial writes. */
1162 page
= memdup_user_nul(buf
, count
);
1164 length
= PTR_ERR(page
);
1170 if (sscanf(page
, "%d", &new_value
) != 1)
1176 bool_pending_values
[index
] = new_value
;
1180 mutex_unlock(&sel_mutex
);
1185 static const struct file_operations sel_bool_ops
= {
1186 .read
= sel_read_bool
,
1187 .write
= sel_write_bool
,
1188 .llseek
= generic_file_llseek
,
1191 static ssize_t
sel_commit_bools_write(struct file
*filep
,
1192 const char __user
*buf
,
1193 size_t count
, loff_t
*ppos
)
1199 mutex_lock(&sel_mutex
);
1201 length
= task_has_security(current
, SECURITY__SETBOOL
);
1206 if (count
>= PAGE_SIZE
)
1209 /* No partial writes. */
1214 page
= memdup_user_nul(buf
, count
);
1216 length
= PTR_ERR(page
);
1222 if (sscanf(page
, "%d", &new_value
) != 1)
1226 if (new_value
&& bool_pending_values
)
1227 length
= security_set_bools(bool_num
, bool_pending_values
);
1233 mutex_unlock(&sel_mutex
);
1238 static const struct file_operations sel_commit_bools_ops
= {
1239 .write
= sel_commit_bools_write
,
1240 .llseek
= generic_file_llseek
,
1243 static void sel_remove_entries(struct dentry
*de
)
1246 shrink_dcache_parent(de
);
1249 #define BOOL_DIR_NAME "booleans"
1251 static int sel_make_bools(void)
1255 struct dentry
*dentry
= NULL
;
1256 struct dentry
*dir
= bool_dir
;
1257 struct inode
*inode
= NULL
;
1258 struct inode_security_struct
*isec
;
1259 char **names
= NULL
, *page
;
1264 /* remove any existing files */
1265 for (i
= 0; i
< bool_num
; i
++)
1266 kfree(bool_pending_names
[i
]);
1267 kfree(bool_pending_names
);
1268 kfree(bool_pending_values
);
1270 bool_pending_names
= NULL
;
1271 bool_pending_values
= NULL
;
1273 sel_remove_entries(dir
);
1276 page
= (char *)get_zeroed_page(GFP_KERNEL
);
1280 ret
= security_get_bools(&num
, &names
, &values
);
1284 for (i
= 0; i
< num
; i
++) {
1286 dentry
= d_alloc_name(dir
, names
[i
]);
1291 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
| S_IRUGO
| S_IWUSR
);
1295 ret
= -ENAMETOOLONG
;
1296 len
= snprintf(page
, PAGE_SIZE
, "/%s/%s", BOOL_DIR_NAME
, names
[i
]);
1297 if (len
>= PAGE_SIZE
)
1300 isec
= (struct inode_security_struct
*)inode
->i_security
;
1301 ret
= security_genfs_sid("selinuxfs", page
, SECCLASS_FILE
, &sid
);
1306 isec
->initialized
= LABEL_INITIALIZED
;
1307 inode
->i_fop
= &sel_bool_ops
;
1308 inode
->i_ino
= i
|SEL_BOOL_INO_OFFSET
;
1309 d_add(dentry
, inode
);
1312 bool_pending_names
= names
;
1313 bool_pending_values
= values
;
1315 free_page((unsigned long)page
);
1318 free_page((unsigned long)page
);
1321 for (i
= 0; i
< num
; i
++)
1326 sel_remove_entries(dir
);
1331 #define NULL_FILE_NAME "null"
1333 struct path selinux_null
;
1335 static ssize_t
sel_read_avc_cache_threshold(struct file
*filp
, char __user
*buf
,
1336 size_t count
, loff_t
*ppos
)
1338 char tmpbuf
[TMPBUFLEN
];
1341 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u", avc_cache_threshold
);
1342 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1345 static ssize_t
sel_write_avc_cache_threshold(struct file
*file
,
1346 const char __user
*buf
,
1347 size_t count
, loff_t
*ppos
)
1352 unsigned int new_value
;
1354 ret
= task_has_security(current
, SECURITY__SETSECPARAM
);
1358 if (count
>= PAGE_SIZE
)
1361 /* No partial writes. */
1365 page
= memdup_user_nul(buf
, count
);
1367 return PTR_ERR(page
);
1370 if (sscanf(page
, "%u", &new_value
) != 1)
1373 avc_cache_threshold
= new_value
;
1381 static ssize_t
sel_read_avc_hash_stats(struct file
*filp
, char __user
*buf
,
1382 size_t count
, loff_t
*ppos
)
1387 page
= (char *)__get_free_page(GFP_KERNEL
);
1391 length
= avc_get_hash_stats(page
);
1393 length
= simple_read_from_buffer(buf
, count
, ppos
, page
, length
);
1394 free_page((unsigned long)page
);
1399 static const struct file_operations sel_avc_cache_threshold_ops
= {
1400 .read
= sel_read_avc_cache_threshold
,
1401 .write
= sel_write_avc_cache_threshold
,
1402 .llseek
= generic_file_llseek
,
1405 static const struct file_operations sel_avc_hash_stats_ops
= {
1406 .read
= sel_read_avc_hash_stats
,
1407 .llseek
= generic_file_llseek
,
1410 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1411 static struct avc_cache_stats
*sel_avc_get_stat_idx(loff_t
*idx
)
1415 for (cpu
= *idx
; cpu
< nr_cpu_ids
; ++cpu
) {
1416 if (!cpu_possible(cpu
))
1419 return &per_cpu(avc_cache_stats
, cpu
);
1424 static void *sel_avc_stats_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1426 loff_t n
= *pos
- 1;
1429 return SEQ_START_TOKEN
;
1431 return sel_avc_get_stat_idx(&n
);
1434 static void *sel_avc_stats_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1436 return sel_avc_get_stat_idx(pos
);
1439 static int sel_avc_stats_seq_show(struct seq_file
*seq
, void *v
)
1441 struct avc_cache_stats
*st
= v
;
1443 if (v
== SEQ_START_TOKEN
)
1444 seq_printf(seq
, "lookups hits misses allocations reclaims "
1447 unsigned int lookups
= st
->lookups
;
1448 unsigned int misses
= st
->misses
;
1449 unsigned int hits
= lookups
- misses
;
1450 seq_printf(seq
, "%u %u %u %u %u %u\n", lookups
,
1451 hits
, misses
, st
->allocations
,
1452 st
->reclaims
, st
->frees
);
1457 static void sel_avc_stats_seq_stop(struct seq_file
*seq
, void *v
)
1460 static const struct seq_operations sel_avc_cache_stats_seq_ops
= {
1461 .start
= sel_avc_stats_seq_start
,
1462 .next
= sel_avc_stats_seq_next
,
1463 .show
= sel_avc_stats_seq_show
,
1464 .stop
= sel_avc_stats_seq_stop
,
1467 static int sel_open_avc_cache_stats(struct inode
*inode
, struct file
*file
)
1469 return seq_open(file
, &sel_avc_cache_stats_seq_ops
);
1472 static const struct file_operations sel_avc_cache_stats_ops
= {
1473 .open
= sel_open_avc_cache_stats
,
1475 .llseek
= seq_lseek
,
1476 .release
= seq_release
,
1480 static int sel_make_avc_files(struct dentry
*dir
)
1483 static struct tree_descr files
[] = {
1484 { "cache_threshold",
1485 &sel_avc_cache_threshold_ops
, S_IRUGO
|S_IWUSR
},
1486 { "hash_stats", &sel_avc_hash_stats_ops
, S_IRUGO
},
1487 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1488 { "cache_stats", &sel_avc_cache_stats_ops
, S_IRUGO
},
1492 for (i
= 0; i
< ARRAY_SIZE(files
); i
++) {
1493 struct inode
*inode
;
1494 struct dentry
*dentry
;
1496 dentry
= d_alloc_name(dir
, files
[i
].name
);
1500 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|files
[i
].mode
);
1504 inode
->i_fop
= files
[i
].ops
;
1505 inode
->i_ino
= ++sel_last_ino
;
1506 d_add(dentry
, inode
);
1512 static ssize_t
sel_read_initcon(struct file
*file
, char __user
*buf
,
1513 size_t count
, loff_t
*ppos
)
1519 sid
= file_inode(file
)->i_ino
&SEL_INO_MASK
;
1520 ret
= security_sid_to_context(sid
, &con
, &len
);
1524 ret
= simple_read_from_buffer(buf
, count
, ppos
, con
, len
);
1529 static const struct file_operations sel_initcon_ops
= {
1530 .read
= sel_read_initcon
,
1531 .llseek
= generic_file_llseek
,
1534 static int sel_make_initcon_files(struct dentry
*dir
)
1538 for (i
= 1; i
<= SECINITSID_NUM
; i
++) {
1539 struct inode
*inode
;
1540 struct dentry
*dentry
;
1541 dentry
= d_alloc_name(dir
, security_get_initial_sid_context(i
));
1545 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|S_IRUGO
);
1549 inode
->i_fop
= &sel_initcon_ops
;
1550 inode
->i_ino
= i
|SEL_INITCON_INO_OFFSET
;
1551 d_add(dentry
, inode
);
1557 static inline unsigned long sel_class_to_ino(u16
class)
1559 return (class * (SEL_VEC_MAX
+ 1)) | SEL_CLASS_INO_OFFSET
;
1562 static inline u16
sel_ino_to_class(unsigned long ino
)
1564 return (ino
& SEL_INO_MASK
) / (SEL_VEC_MAX
+ 1);
1567 static inline unsigned long sel_perm_to_ino(u16
class, u32 perm
)
1569 return (class * (SEL_VEC_MAX
+ 1) + perm
) | SEL_CLASS_INO_OFFSET
;
1572 static inline u32
sel_ino_to_perm(unsigned long ino
)
1574 return (ino
& SEL_INO_MASK
) % (SEL_VEC_MAX
+ 1);
1577 static ssize_t
sel_read_class(struct file
*file
, char __user
*buf
,
1578 size_t count
, loff_t
*ppos
)
1580 unsigned long ino
= file_inode(file
)->i_ino
;
1581 char res
[TMPBUFLEN
];
1582 ssize_t len
= snprintf(res
, sizeof(res
), "%d", sel_ino_to_class(ino
));
1583 return simple_read_from_buffer(buf
, count
, ppos
, res
, len
);
1586 static const struct file_operations sel_class_ops
= {
1587 .read
= sel_read_class
,
1588 .llseek
= generic_file_llseek
,
1591 static ssize_t
sel_read_perm(struct file
*file
, char __user
*buf
,
1592 size_t count
, loff_t
*ppos
)
1594 unsigned long ino
= file_inode(file
)->i_ino
;
1595 char res
[TMPBUFLEN
];
1596 ssize_t len
= snprintf(res
, sizeof(res
), "%d", sel_ino_to_perm(ino
));
1597 return simple_read_from_buffer(buf
, count
, ppos
, res
, len
);
1600 static const struct file_operations sel_perm_ops
= {
1601 .read
= sel_read_perm
,
1602 .llseek
= generic_file_llseek
,
1605 static ssize_t
sel_read_policycap(struct file
*file
, char __user
*buf
,
1606 size_t count
, loff_t
*ppos
)
1609 char tmpbuf
[TMPBUFLEN
];
1611 unsigned long i_ino
= file_inode(file
)->i_ino
;
1613 value
= security_policycap_supported(i_ino
& SEL_INO_MASK
);
1614 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d", value
);
1616 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1619 static const struct file_operations sel_policycap_ops
= {
1620 .read
= sel_read_policycap
,
1621 .llseek
= generic_file_llseek
,
1624 static int sel_make_perm_files(char *objclass
, int classvalue
,
1630 rc
= security_get_permissions(objclass
, &perms
, &nperms
);
1634 for (i
= 0; i
< nperms
; i
++) {
1635 struct inode
*inode
;
1636 struct dentry
*dentry
;
1639 dentry
= d_alloc_name(dir
, perms
[i
]);
1644 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|S_IRUGO
);
1648 inode
->i_fop
= &sel_perm_ops
;
1649 /* i+1 since perm values are 1-indexed */
1650 inode
->i_ino
= sel_perm_to_ino(classvalue
, i
+ 1);
1651 d_add(dentry
, inode
);
1655 for (i
= 0; i
< nperms
; i
++)
1661 static int sel_make_class_dir_entries(char *classname
, int index
,
1664 struct dentry
*dentry
= NULL
;
1665 struct inode
*inode
= NULL
;
1668 dentry
= d_alloc_name(dir
, "index");
1672 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|S_IRUGO
);
1676 inode
->i_fop
= &sel_class_ops
;
1677 inode
->i_ino
= sel_class_to_ino(index
);
1678 d_add(dentry
, inode
);
1680 dentry
= sel_make_dir(dir
, "perms", &last_class_ino
);
1682 return PTR_ERR(dentry
);
1684 rc
= sel_make_perm_files(classname
, index
, dentry
);
1689 static int sel_make_classes(void)
1691 int rc
, nclasses
, i
;
1694 /* delete any existing entries */
1695 sel_remove_entries(class_dir
);
1697 rc
= security_get_classes(&classes
, &nclasses
);
1701 /* +2 since classes are 1-indexed */
1702 last_class_ino
= sel_class_to_ino(nclasses
+ 2);
1704 for (i
= 0; i
< nclasses
; i
++) {
1705 struct dentry
*class_name_dir
;
1707 class_name_dir
= sel_make_dir(class_dir
, classes
[i
],
1709 if (IS_ERR(class_name_dir
)) {
1710 rc
= PTR_ERR(class_name_dir
);
1714 /* i+1 since class values are 1-indexed */
1715 rc
= sel_make_class_dir_entries(classes
[i
], i
+ 1,
1722 for (i
= 0; i
< nclasses
; i
++)
1728 static int sel_make_policycap(void)
1731 struct dentry
*dentry
= NULL
;
1732 struct inode
*inode
= NULL
;
1734 sel_remove_entries(policycap_dir
);
1736 for (iter
= 0; iter
<= POLICYDB_CAPABILITY_MAX
; iter
++) {
1737 if (iter
< ARRAY_SIZE(policycap_names
))
1738 dentry
= d_alloc_name(policycap_dir
,
1739 policycap_names
[iter
]);
1741 dentry
= d_alloc_name(policycap_dir
, "unknown");
1746 inode
= sel_make_inode(policycap_dir
->d_sb
, S_IFREG
| S_IRUGO
);
1750 inode
->i_fop
= &sel_policycap_ops
;
1751 inode
->i_ino
= iter
| SEL_POLICYCAP_INO_OFFSET
;
1752 d_add(dentry
, inode
);
1758 static struct dentry
*sel_make_dir(struct dentry
*dir
, const char *name
,
1761 struct dentry
*dentry
= d_alloc_name(dir
, name
);
1762 struct inode
*inode
;
1765 return ERR_PTR(-ENOMEM
);
1767 inode
= sel_make_inode(dir
->d_sb
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
1770 return ERR_PTR(-ENOMEM
);
1773 inode
->i_op
= &simple_dir_inode_operations
;
1774 inode
->i_fop
= &simple_dir_operations
;
1775 inode
->i_ino
= ++(*ino
);
1776 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1778 d_add(dentry
, inode
);
1779 /* bump link count on parent directory, too */
1780 inc_nlink(d_inode(dir
));
1785 static int sel_fill_super(struct super_block
*sb
, void *data
, int silent
)
1788 struct dentry
*dentry
;
1789 struct inode
*inode
;
1790 struct inode_security_struct
*isec
;
1792 static struct tree_descr selinux_files
[] = {
1793 [SEL_LOAD
] = {"load", &sel_load_ops
, S_IRUSR
|S_IWUSR
},
1794 [SEL_ENFORCE
] = {"enforce", &sel_enforce_ops
, S_IRUGO
|S_IWUSR
},
1795 [SEL_CONTEXT
] = {"context", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1796 [SEL_ACCESS
] = {"access", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1797 [SEL_CREATE
] = {"create", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1798 [SEL_RELABEL
] = {"relabel", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1799 [SEL_USER
] = {"user", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1800 [SEL_POLICYVERS
] = {"policyvers", &sel_policyvers_ops
, S_IRUGO
},
1801 [SEL_COMMIT_BOOLS
] = {"commit_pending_bools", &sel_commit_bools_ops
, S_IWUSR
},
1802 [SEL_MLS
] = {"mls", &sel_mls_ops
, S_IRUGO
},
1803 [SEL_DISABLE
] = {"disable", &sel_disable_ops
, S_IWUSR
},
1804 [SEL_MEMBER
] = {"member", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1805 [SEL_CHECKREQPROT
] = {"checkreqprot", &sel_checkreqprot_ops
, S_IRUGO
|S_IWUSR
},
1806 [SEL_REJECT_UNKNOWN
] = {"reject_unknown", &sel_handle_unknown_ops
, S_IRUGO
},
1807 [SEL_DENY_UNKNOWN
] = {"deny_unknown", &sel_handle_unknown_ops
, S_IRUGO
},
1808 [SEL_STATUS
] = {"status", &sel_handle_status_ops
, S_IRUGO
},
1809 [SEL_POLICY
] = {"policy", &sel_policy_ops
, S_IRUGO
},
1810 [SEL_VALIDATE_TRANS
] = {"validatetrans", &sel_transition_ops
,
1814 ret
= simple_fill_super(sb
, SELINUX_MAGIC
, selinux_files
);
1818 bool_dir
= sel_make_dir(sb
->s_root
, BOOL_DIR_NAME
, &sel_last_ino
);
1819 if (IS_ERR(bool_dir
)) {
1820 ret
= PTR_ERR(bool_dir
);
1826 dentry
= d_alloc_name(sb
->s_root
, NULL_FILE_NAME
);
1831 inode
= sel_make_inode(sb
, S_IFCHR
| S_IRUGO
| S_IWUGO
);
1835 inode
->i_ino
= ++sel_last_ino
;
1836 isec
= (struct inode_security_struct
*)inode
->i_security
;
1837 isec
->sid
= SECINITSID_DEVNULL
;
1838 isec
->sclass
= SECCLASS_CHR_FILE
;
1839 isec
->initialized
= LABEL_INITIALIZED
;
1841 init_special_inode(inode
, S_IFCHR
| S_IRUGO
| S_IWUGO
, MKDEV(MEM_MAJOR
, 3));
1842 d_add(dentry
, inode
);
1843 selinux_null
.dentry
= dentry
;
1845 dentry
= sel_make_dir(sb
->s_root
, "avc", &sel_last_ino
);
1846 if (IS_ERR(dentry
)) {
1847 ret
= PTR_ERR(dentry
);
1851 ret
= sel_make_avc_files(dentry
);
1855 dentry
= sel_make_dir(sb
->s_root
, "initial_contexts", &sel_last_ino
);
1856 if (IS_ERR(dentry
)) {
1857 ret
= PTR_ERR(dentry
);
1861 ret
= sel_make_initcon_files(dentry
);
1865 class_dir
= sel_make_dir(sb
->s_root
, "class", &sel_last_ino
);
1866 if (IS_ERR(class_dir
)) {
1867 ret
= PTR_ERR(class_dir
);
1872 policycap_dir
= sel_make_dir(sb
->s_root
, "policy_capabilities", &sel_last_ino
);
1873 if (IS_ERR(policycap_dir
)) {
1874 ret
= PTR_ERR(policycap_dir
);
1875 policycap_dir
= NULL
;
1880 printk(KERN_ERR
"SELinux: %s: failed while creating inodes\n",
1885 static struct dentry
*sel_mount(struct file_system_type
*fs_type
,
1886 int flags
, const char *dev_name
, void *data
)
1888 return mount_single(fs_type
, flags
, data
, sel_fill_super
);
1891 static struct file_system_type sel_fs_type
= {
1892 .name
= "selinuxfs",
1894 .kill_sb
= kill_litter_super
,
1897 struct vfsmount
*selinuxfs_mount
;
1899 static int __init
init_sel_fs(void)
1903 if (!selinux_enabled
)
1906 err
= sysfs_create_mount_point(fs_kobj
, "selinux");
1910 err
= register_filesystem(&sel_fs_type
);
1912 sysfs_remove_mount_point(fs_kobj
, "selinux");
1916 selinux_null
.mnt
= selinuxfs_mount
= kern_mount(&sel_fs_type
);
1917 if (IS_ERR(selinuxfs_mount
)) {
1918 printk(KERN_ERR
"selinuxfs: could not mount!\n");
1919 err
= PTR_ERR(selinuxfs_mount
);
1920 selinuxfs_mount
= NULL
;
1926 __initcall(init_sel_fs
);
1928 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
1929 void exit_sel_fs(void)
1931 sysfs_remove_mount_point(fs_kobj
, "selinux");
1932 kern_unmount(selinuxfs_mount
);
1933 unregister_filesystem(&sel_fs_type
);