1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Updated: Karl MacMillan <kmacmillan@tresys.com>
4 * Added conditional policy language extensions
6 * Updated: Hewlett-Packard <paul@paul-moore.com>
8 * Added support for the policy capability bitmap
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>
15 #include <linux/kernel.h>
16 #include <linux/pagemap.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
20 #include <linux/mount.h>
21 #include <linux/mutex.h>
22 #include <linux/init.h>
23 #include <linux/string.h>
24 #include <linux/security.h>
25 #include <linux/major.h>
26 #include <linux/seq_file.h>
27 #include <linux/percpu.h>
28 #include <linux/audit.h>
29 #include <linux/uaccess.h>
30 #include <linux/kobject.h>
31 #include <linux/ctype.h>
33 /* selinuxfs pseudo filesystem for exporting the security policy API.
34 Based on the proc code and the fs/nfsd/nfsctl.c code. */
41 #include "conditional.h"
45 SEL_LOAD
, /* load policy */
46 SEL_ENFORCE
, /* get or set enforcing status */
47 SEL_CONTEXT
, /* validate context */
48 SEL_ACCESS
, /* compute access decision */
49 SEL_CREATE
, /* compute create labeling decision */
50 SEL_RELABEL
, /* compute relabeling decision */
51 SEL_USER
, /* compute reachable user contexts */
52 SEL_POLICYVERS
, /* return policy version for this kernel */
53 SEL_COMMIT_BOOLS
, /* commit new boolean values */
54 SEL_MLS
, /* return if MLS policy is enabled */
55 SEL_DISABLE
, /* disable SELinux until next reboot */
56 SEL_MEMBER
, /* compute polyinstantiation membership decision */
57 SEL_CHECKREQPROT
, /* check requested protection, not kernel-applied one */
58 SEL_COMPAT_NET
, /* whether to use old compat network packet controls */
59 SEL_REJECT_UNKNOWN
, /* export unknown reject handling to userspace */
60 SEL_DENY_UNKNOWN
, /* export unknown deny handling to userspace */
61 SEL_STATUS
, /* export current status using mmap() */
62 SEL_POLICY
, /* allow userspace to read the in kernel policy */
63 SEL_VALIDATE_TRANS
, /* compute validatetrans decision */
64 SEL_INO_NEXT
, /* The next inode number to use */
67 struct selinux_fs_info
{
68 struct dentry
*bool_dir
;
69 unsigned int bool_num
;
70 char **bool_pending_names
;
71 unsigned int *bool_pending_values
;
72 struct dentry
*class_dir
;
73 unsigned long last_class_ino
;
75 struct dentry
*policycap_dir
;
77 unsigned long last_ino
;
78 struct selinux_state
*state
;
79 struct super_block
*sb
;
82 static int selinux_fs_info_create(struct super_block
*sb
)
84 struct selinux_fs_info
*fsi
;
86 fsi
= kzalloc(sizeof(*fsi
), GFP_KERNEL
);
90 mutex_init(&fsi
->mutex
);
91 fsi
->last_ino
= SEL_INO_NEXT
- 1;
92 fsi
->state
= &selinux_state
;
98 static void selinux_fs_info_free(struct super_block
*sb
)
100 struct selinux_fs_info
*fsi
= sb
->s_fs_info
;
104 for (i
= 0; i
< fsi
->bool_num
; i
++)
105 kfree(fsi
->bool_pending_names
[i
]);
106 kfree(fsi
->bool_pending_names
);
107 kfree(fsi
->bool_pending_values
);
109 kfree(sb
->s_fs_info
);
110 sb
->s_fs_info
= NULL
;
113 #define SEL_INITCON_INO_OFFSET 0x01000000
114 #define SEL_BOOL_INO_OFFSET 0x02000000
115 #define SEL_CLASS_INO_OFFSET 0x04000000
116 #define SEL_POLICYCAP_INO_OFFSET 0x08000000
117 #define SEL_INO_MASK 0x00ffffff
120 static ssize_t
sel_read_enforce(struct file
*filp
, char __user
*buf
,
121 size_t count
, loff_t
*ppos
)
123 struct selinux_fs_info
*fsi
= file_inode(filp
)->i_sb
->s_fs_info
;
124 char tmpbuf
[TMPBUFLEN
];
127 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d",
128 enforcing_enabled(fsi
->state
));
129 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
132 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
133 static ssize_t
sel_write_enforce(struct file
*file
, const char __user
*buf
,
134 size_t count
, loff_t
*ppos
)
137 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
138 struct selinux_state
*state
= fsi
->state
;
141 int old_value
, new_value
;
143 if (count
>= PAGE_SIZE
)
146 /* No partial writes. */
150 page
= memdup_user_nul(buf
, count
);
152 return PTR_ERR(page
);
155 if (sscanf(page
, "%d", &new_value
) != 1)
158 new_value
= !!new_value
;
160 old_value
= enforcing_enabled(state
);
161 if (new_value
!= old_value
) {
162 length
= avc_has_perm(&selinux_state
,
163 current_sid(), SECINITSID_SECURITY
,
164 SECCLASS_SECURITY
, SECURITY__SETENFORCE
,
168 audit_log(audit_context(), GFP_KERNEL
, AUDIT_MAC_STATUS
,
169 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
170 " enabled=%d old-enabled=%d lsm=selinux res=1",
171 new_value
, old_value
,
172 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
173 audit_get_sessionid(current
),
174 selinux_enabled
, selinux_enabled
);
175 enforcing_set(state
, new_value
);
177 avc_ss_reset(state
->avc
, 0);
178 selnl_notify_setenforce(new_value
);
179 selinux_status_update_setenforce(state
, new_value
);
181 call_lsm_notifier(LSM_POLICY_CHANGE
, NULL
);
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 struct selinux_fs_info
*fsi
= file_inode(filp
)->i_sb
->s_fs_info
;
202 struct selinux_state
*state
= fsi
->state
;
203 char tmpbuf
[TMPBUFLEN
];
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
);
210 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d", handle_unknown
);
211 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
214 static const struct file_operations sel_handle_unknown_ops
= {
215 .read
= sel_read_handle_unknown
,
216 .llseek
= generic_file_llseek
,
219 static int sel_open_handle_status(struct inode
*inode
, struct file
*filp
)
221 struct selinux_fs_info
*fsi
= file_inode(filp
)->i_sb
->s_fs_info
;
222 struct page
*status
= selinux_kernel_status_page(fsi
->state
);
227 filp
->private_data
= status
;
232 static ssize_t
sel_read_handle_status(struct file
*filp
, char __user
*buf
,
233 size_t count
, loff_t
*ppos
)
235 struct page
*status
= filp
->private_data
;
239 return simple_read_from_buffer(buf
, count
, ppos
,
240 page_address(status
),
241 sizeof(struct selinux_kernel_status
));
244 static int sel_mmap_handle_status(struct file
*filp
,
245 struct vm_area_struct
*vma
)
247 struct page
*status
= filp
->private_data
;
248 unsigned long size
= vma
->vm_end
- vma
->vm_start
;
252 /* only allows one page from the head */
253 if (vma
->vm_pgoff
> 0 || size
!= PAGE_SIZE
)
255 /* disallow writable mapping */
256 if (vma
->vm_flags
& VM_WRITE
)
258 /* disallow mprotect() turns it into writable */
259 vma
->vm_flags
&= ~VM_MAYWRITE
;
261 return remap_pfn_range(vma
, vma
->vm_start
,
263 size
, vma
->vm_page_prot
);
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
,
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
)
278 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
284 if (count
>= PAGE_SIZE
)
287 /* No partial writes. */
291 page
= memdup_user_nul(buf
, count
);
293 return PTR_ERR(page
);
296 if (sscanf(page
, "%d", &new_value
) != 1)
300 enforcing
= enforcing_enabled(fsi
->state
);
301 length
= selinux_disable(fsi
->state
);
304 audit_log(audit_context(), GFP_KERNEL
, AUDIT_MAC_STATUS
,
305 "enforcing=%d old_enforcing=%d auid=%u ses=%u"
306 " enabled=%d old-enabled=%d lsm=selinux res=1",
307 enforcing
, enforcing
,
308 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
309 audit_get_sessionid(current
), 0, 1);
318 #define sel_write_disable NULL
321 static const struct file_operations sel_disable_ops
= {
322 .write
= sel_write_disable
,
323 .llseek
= generic_file_llseek
,
326 static ssize_t
sel_read_policyvers(struct file
*filp
, char __user
*buf
,
327 size_t count
, loff_t
*ppos
)
329 char tmpbuf
[TMPBUFLEN
];
332 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u", POLICYDB_VERSION_MAX
);
333 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
336 static const struct file_operations sel_policyvers_ops
= {
337 .read
= sel_read_policyvers
,
338 .llseek
= generic_file_llseek
,
341 /* declaration for sel_write_load */
342 static int sel_make_bools(struct selinux_fs_info
*fsi
);
343 static int sel_make_classes(struct selinux_fs_info
*fsi
);
344 static int sel_make_policycap(struct selinux_fs_info
*fsi
);
346 /* declaration for sel_make_class_dirs */
347 static struct dentry
*sel_make_dir(struct dentry
*dir
, const char *name
,
350 static ssize_t
sel_read_mls(struct file
*filp
, char __user
*buf
,
351 size_t count
, loff_t
*ppos
)
353 struct selinux_fs_info
*fsi
= file_inode(filp
)->i_sb
->s_fs_info
;
354 char tmpbuf
[TMPBUFLEN
];
357 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d",
358 security_mls_enabled(fsi
->state
));
359 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
362 static const struct file_operations sel_mls_ops
= {
363 .read
= sel_read_mls
,
364 .llseek
= generic_file_llseek
,
367 struct policy_load_memory
{
372 static int sel_open_policy(struct inode
*inode
, struct file
*filp
)
374 struct selinux_fs_info
*fsi
= inode
->i_sb
->s_fs_info
;
375 struct selinux_state
*state
= fsi
->state
;
376 struct policy_load_memory
*plm
= NULL
;
379 BUG_ON(filp
->private_data
);
381 mutex_lock(&fsi
->mutex
);
383 rc
= avc_has_perm(&selinux_state
,
384 current_sid(), SECINITSID_SECURITY
,
385 SECCLASS_SECURITY
, SECURITY__READ_POLICY
, NULL
);
390 if (fsi
->policy_opened
)
394 plm
= kzalloc(sizeof(*plm
), GFP_KERNEL
);
398 if (i_size_read(inode
) != security_policydb_len(state
)) {
400 i_size_write(inode
, security_policydb_len(state
));
404 rc
= security_read_policy(state
, &plm
->data
, &plm
->len
);
408 fsi
->policy_opened
= 1;
410 filp
->private_data
= plm
;
412 mutex_unlock(&fsi
->mutex
);
416 mutex_unlock(&fsi
->mutex
);
424 static int sel_release_policy(struct inode
*inode
, struct file
*filp
)
426 struct selinux_fs_info
*fsi
= inode
->i_sb
->s_fs_info
;
427 struct policy_load_memory
*plm
= filp
->private_data
;
431 fsi
->policy_opened
= 0;
439 static ssize_t
sel_read_policy(struct file
*filp
, char __user
*buf
,
440 size_t count
, loff_t
*ppos
)
442 struct policy_load_memory
*plm
= filp
->private_data
;
445 ret
= avc_has_perm(&selinux_state
,
446 current_sid(), SECINITSID_SECURITY
,
447 SECCLASS_SECURITY
, SECURITY__READ_POLICY
, NULL
);
451 return simple_read_from_buffer(buf
, count
, ppos
, plm
->data
, plm
->len
);
454 static vm_fault_t
sel_mmap_policy_fault(struct vm_fault
*vmf
)
456 struct policy_load_memory
*plm
= vmf
->vma
->vm_file
->private_data
;
457 unsigned long offset
;
460 if (vmf
->flags
& (FAULT_FLAG_MKWRITE
| FAULT_FLAG_WRITE
))
461 return VM_FAULT_SIGBUS
;
463 offset
= vmf
->pgoff
<< PAGE_SHIFT
;
464 if (offset
>= roundup(plm
->len
, PAGE_SIZE
))
465 return VM_FAULT_SIGBUS
;
467 page
= vmalloc_to_page(plm
->data
+ offset
);
475 static const struct vm_operations_struct sel_mmap_policy_ops
= {
476 .fault
= sel_mmap_policy_fault
,
477 .page_mkwrite
= sel_mmap_policy_fault
,
480 static int sel_mmap_policy(struct file
*filp
, struct vm_area_struct
*vma
)
482 if (vma
->vm_flags
& VM_SHARED
) {
483 /* do not allow mprotect to make mapping writable */
484 vma
->vm_flags
&= ~VM_MAYWRITE
;
486 if (vma
->vm_flags
& VM_WRITE
)
490 vma
->vm_flags
|= VM_DONTEXPAND
| VM_DONTDUMP
;
491 vma
->vm_ops
= &sel_mmap_policy_ops
;
496 static const struct file_operations sel_policy_ops
= {
497 .open
= sel_open_policy
,
498 .read
= sel_read_policy
,
499 .mmap
= sel_mmap_policy
,
500 .release
= sel_release_policy
,
501 .llseek
= generic_file_llseek
,
504 static int sel_make_policy_nodes(struct selinux_fs_info
*fsi
)
508 ret
= sel_make_bools(fsi
);
510 pr_err("SELinux: failed to load policy booleans\n");
514 ret
= sel_make_classes(fsi
);
516 pr_err("SELinux: failed to load policy classes\n");
520 ret
= sel_make_policycap(fsi
);
522 pr_err("SELinux: failed to load policy capabilities\n");
529 static ssize_t
sel_write_load(struct file
*file
, const char __user
*buf
,
530 size_t count
, loff_t
*ppos
)
533 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
537 mutex_lock(&fsi
->mutex
);
539 length
= avc_has_perm(&selinux_state
,
540 current_sid(), SECINITSID_SECURITY
,
541 SECCLASS_SECURITY
, SECURITY__LOAD_POLICY
, NULL
);
545 /* No partial writes. */
551 if (count
> 64 * 1024 * 1024)
555 data
= vmalloc(count
);
560 if (copy_from_user(data
, buf
, count
) != 0)
563 length
= security_load_policy(fsi
->state
, data
, count
);
565 pr_warn_ratelimited("SELinux: failed to load policy\n");
569 length
= sel_make_policy_nodes(fsi
);
576 audit_log(audit_context(), GFP_KERNEL
, AUDIT_MAC_POLICY_LOAD
,
577 "auid=%u ses=%u lsm=selinux res=1",
578 from_kuid(&init_user_ns
, audit_get_loginuid(current
)),
579 audit_get_sessionid(current
));
581 mutex_unlock(&fsi
->mutex
);
586 static const struct file_operations sel_load_ops
= {
587 .write
= sel_write_load
,
588 .llseek
= generic_file_llseek
,
591 static ssize_t
sel_write_context(struct file
*file
, char *buf
, size_t size
)
593 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
594 struct selinux_state
*state
= fsi
->state
;
599 length
= avc_has_perm(&selinux_state
,
600 current_sid(), SECINITSID_SECURITY
,
601 SECCLASS_SECURITY
, SECURITY__CHECK_CONTEXT
, NULL
);
605 length
= security_context_to_sid(state
, buf
, size
, &sid
, GFP_KERNEL
);
609 length
= security_sid_to_context(state
, sid
, &canon
, &len
);
614 if (len
> SIMPLE_TRANSACTION_LIMIT
) {
615 pr_err("SELinux: %s: context size (%u) exceeds "
616 "payload max\n", __func__
, len
);
620 memcpy(buf
, canon
, len
);
627 static ssize_t
sel_read_checkreqprot(struct file
*filp
, char __user
*buf
,
628 size_t count
, loff_t
*ppos
)
630 struct selinux_fs_info
*fsi
= file_inode(filp
)->i_sb
->s_fs_info
;
631 char tmpbuf
[TMPBUFLEN
];
634 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u", fsi
->state
->checkreqprot
);
635 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
638 static ssize_t
sel_write_checkreqprot(struct file
*file
, const char __user
*buf
,
639 size_t count
, loff_t
*ppos
)
641 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
644 unsigned int new_value
;
646 length
= avc_has_perm(&selinux_state
,
647 current_sid(), SECINITSID_SECURITY
,
648 SECCLASS_SECURITY
, SECURITY__SETCHECKREQPROT
,
653 if (count
>= PAGE_SIZE
)
656 /* No partial writes. */
660 page
= memdup_user_nul(buf
, count
);
662 return PTR_ERR(page
);
665 if (sscanf(page
, "%u", &new_value
) != 1)
668 fsi
->state
->checkreqprot
= new_value
? 1 : 0;
674 static const struct file_operations sel_checkreqprot_ops
= {
675 .read
= sel_read_checkreqprot
,
676 .write
= sel_write_checkreqprot
,
677 .llseek
= generic_file_llseek
,
680 static ssize_t
sel_write_validatetrans(struct file
*file
,
681 const char __user
*buf
,
682 size_t count
, loff_t
*ppos
)
684 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
685 struct selinux_state
*state
= fsi
->state
;
686 char *oldcon
= NULL
, *newcon
= NULL
, *taskcon
= NULL
;
688 u32 osid
, nsid
, tsid
;
692 rc
= avc_has_perm(&selinux_state
,
693 current_sid(), SECINITSID_SECURITY
,
694 SECCLASS_SECURITY
, SECURITY__VALIDATE_TRANS
, NULL
);
699 if (count
>= PAGE_SIZE
)
702 /* No partial writes. */
707 req
= memdup_user_nul(buf
, count
);
715 oldcon
= kzalloc(count
+ 1, GFP_KERNEL
);
719 newcon
= kzalloc(count
+ 1, GFP_KERNEL
);
723 taskcon
= kzalloc(count
+ 1, GFP_KERNEL
);
728 if (sscanf(req
, "%s %s %hu %s", oldcon
, newcon
, &tclass
, taskcon
) != 4)
731 rc
= security_context_str_to_sid(state
, oldcon
, &osid
, GFP_KERNEL
);
735 rc
= security_context_str_to_sid(state
, newcon
, &nsid
, GFP_KERNEL
);
739 rc
= security_context_str_to_sid(state
, taskcon
, &tsid
, GFP_KERNEL
);
743 rc
= security_validate_transition_user(state
, osid
, nsid
, tsid
, tclass
);
754 static const struct file_operations sel_transition_ops
= {
755 .write
= sel_write_validatetrans
,
756 .llseek
= generic_file_llseek
,
760 * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
762 static ssize_t
sel_write_access(struct file
*file
, char *buf
, size_t size
);
763 static ssize_t
sel_write_create(struct file
*file
, char *buf
, size_t size
);
764 static ssize_t
sel_write_relabel(struct file
*file
, char *buf
, size_t size
);
765 static ssize_t
sel_write_user(struct file
*file
, char *buf
, size_t size
);
766 static ssize_t
sel_write_member(struct file
*file
, char *buf
, size_t size
);
768 static ssize_t (*const write_op
[])(struct file
*, char *, size_t) = {
769 [SEL_ACCESS
] = sel_write_access
,
770 [SEL_CREATE
] = sel_write_create
,
771 [SEL_RELABEL
] = sel_write_relabel
,
772 [SEL_USER
] = sel_write_user
,
773 [SEL_MEMBER
] = sel_write_member
,
774 [SEL_CONTEXT
] = sel_write_context
,
777 static ssize_t
selinux_transaction_write(struct file
*file
, const char __user
*buf
, size_t size
, loff_t
*pos
)
779 ino_t ino
= file_inode(file
)->i_ino
;
783 if (ino
>= ARRAY_SIZE(write_op
) || !write_op
[ino
])
786 data
= simple_transaction_get(file
, buf
, size
);
788 return PTR_ERR(data
);
790 rv
= write_op
[ino
](file
, data
, size
);
792 simple_transaction_set(file
, rv
);
798 static const struct file_operations transaction_ops
= {
799 .write
= selinux_transaction_write
,
800 .read
= simple_transaction_read
,
801 .release
= simple_transaction_release
,
802 .llseek
= generic_file_llseek
,
806 * payload - write methods
807 * If the method has a response, the response should be put in buf,
808 * and the length returned. Otherwise return 0 or and -error.
811 static ssize_t
sel_write_access(struct file
*file
, char *buf
, size_t size
)
813 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
814 struct selinux_state
*state
= fsi
->state
;
815 char *scon
= NULL
, *tcon
= NULL
;
818 struct av_decision avd
;
821 length
= avc_has_perm(&selinux_state
,
822 current_sid(), SECINITSID_SECURITY
,
823 SECCLASS_SECURITY
, SECURITY__COMPUTE_AV
, NULL
);
828 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
833 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
838 if (sscanf(buf
, "%s %s %hu", scon
, tcon
, &tclass
) != 3)
841 length
= security_context_str_to_sid(state
, scon
, &ssid
, GFP_KERNEL
);
845 length
= security_context_str_to_sid(state
, tcon
, &tsid
, GFP_KERNEL
);
849 security_compute_av_user(state
, ssid
, tsid
, tclass
, &avd
);
851 length
= scnprintf(buf
, SIMPLE_TRANSACTION_LIMIT
,
853 avd
.allowed
, 0xffffffff,
854 avd
.auditallow
, avd
.auditdeny
,
855 avd
.seqno
, avd
.flags
);
862 static ssize_t
sel_write_create(struct file
*file
, char *buf
, size_t size
)
864 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
865 struct selinux_state
*state
= fsi
->state
;
866 char *scon
= NULL
, *tcon
= NULL
;
867 char *namebuf
= NULL
, *objname
= NULL
;
868 u32 ssid
, tsid
, newsid
;
875 length
= avc_has_perm(&selinux_state
,
876 current_sid(), SECINITSID_SECURITY
,
877 SECCLASS_SECURITY
, SECURITY__COMPUTE_CREATE
,
883 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
888 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
893 namebuf
= kzalloc(size
+ 1, GFP_KERNEL
);
898 nargs
= sscanf(buf
, "%s %s %hu %s", scon
, tcon
, &tclass
, namebuf
);
899 if (nargs
< 3 || nargs
> 4)
903 * If and when the name of new object to be queried contains
904 * either whitespace or multibyte characters, they shall be
905 * encoded based on the percentage-encoding rule.
906 * If not encoded, the sscanf logic picks up only left-half
907 * of the supplied name; splitted by a whitespace unexpectedly.
917 else if (c1
== '%') {
918 c1
= hex_to_bin(*r
++);
921 c2
= hex_to_bin(*r
++);
927 } while (c1
!= '\0');
932 length
= security_context_str_to_sid(state
, scon
, &ssid
, GFP_KERNEL
);
936 length
= security_context_str_to_sid(state
, tcon
, &tsid
, GFP_KERNEL
);
940 length
= security_transition_sid_user(state
, ssid
, tsid
, tclass
,
945 length
= security_sid_to_context(state
, newsid
, &newcon
, &len
);
950 if (len
> SIMPLE_TRANSACTION_LIMIT
) {
951 pr_err("SELinux: %s: context size (%u) exceeds "
952 "payload max\n", __func__
, len
);
956 memcpy(buf
, newcon
, len
);
966 static ssize_t
sel_write_relabel(struct file
*file
, char *buf
, size_t size
)
968 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
969 struct selinux_state
*state
= fsi
->state
;
970 char *scon
= NULL
, *tcon
= NULL
;
971 u32 ssid
, tsid
, newsid
;
977 length
= avc_has_perm(&selinux_state
,
978 current_sid(), SECINITSID_SECURITY
,
979 SECCLASS_SECURITY
, SECURITY__COMPUTE_RELABEL
,
985 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
990 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
995 if (sscanf(buf
, "%s %s %hu", scon
, tcon
, &tclass
) != 3)
998 length
= security_context_str_to_sid(state
, scon
, &ssid
, GFP_KERNEL
);
1002 length
= security_context_str_to_sid(state
, tcon
, &tsid
, GFP_KERNEL
);
1006 length
= security_change_sid(state
, ssid
, tsid
, tclass
, &newsid
);
1010 length
= security_sid_to_context(state
, newsid
, &newcon
, &len
);
1015 if (len
> SIMPLE_TRANSACTION_LIMIT
)
1018 memcpy(buf
, newcon
, len
);
1027 static ssize_t
sel_write_user(struct file
*file
, char *buf
, size_t size
)
1029 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
1030 struct selinux_state
*state
= fsi
->state
;
1031 char *con
= NULL
, *user
= NULL
, *ptr
;
1032 u32 sid
, *sids
= NULL
;
1038 length
= avc_has_perm(&selinux_state
,
1039 current_sid(), SECINITSID_SECURITY
,
1040 SECCLASS_SECURITY
, SECURITY__COMPUTE_USER
,
1046 con
= kzalloc(size
+ 1, GFP_KERNEL
);
1051 user
= kzalloc(size
+ 1, GFP_KERNEL
);
1056 if (sscanf(buf
, "%s %s", con
, user
) != 2)
1059 length
= security_context_str_to_sid(state
, con
, &sid
, GFP_KERNEL
);
1063 length
= security_get_user_sids(state
, sid
, user
, &sids
, &nsids
);
1067 length
= sprintf(buf
, "%u", nsids
) + 1;
1069 for (i
= 0; i
< nsids
; i
++) {
1070 rc
= security_sid_to_context(state
, sids
[i
], &newcon
, &len
);
1075 if ((length
+ len
) >= SIMPLE_TRANSACTION_LIMIT
) {
1080 memcpy(ptr
, newcon
, len
);
1092 static ssize_t
sel_write_member(struct file
*file
, char *buf
, size_t size
)
1094 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
1095 struct selinux_state
*state
= fsi
->state
;
1096 char *scon
= NULL
, *tcon
= NULL
;
1097 u32 ssid
, tsid
, newsid
;
1100 char *newcon
= NULL
;
1103 length
= avc_has_perm(&selinux_state
,
1104 current_sid(), SECINITSID_SECURITY
,
1105 SECCLASS_SECURITY
, SECURITY__COMPUTE_MEMBER
,
1111 scon
= kzalloc(size
+ 1, GFP_KERNEL
);
1116 tcon
= kzalloc(size
+ 1, GFP_KERNEL
);
1121 if (sscanf(buf
, "%s %s %hu", scon
, tcon
, &tclass
) != 3)
1124 length
= security_context_str_to_sid(state
, scon
, &ssid
, GFP_KERNEL
);
1128 length
= security_context_str_to_sid(state
, tcon
, &tsid
, GFP_KERNEL
);
1132 length
= security_member_sid(state
, ssid
, tsid
, tclass
, &newsid
);
1136 length
= security_sid_to_context(state
, newsid
, &newcon
, &len
);
1141 if (len
> SIMPLE_TRANSACTION_LIMIT
) {
1142 pr_err("SELinux: %s: context size (%u) exceeds "
1143 "payload max\n", __func__
, len
);
1147 memcpy(buf
, newcon
, len
);
1156 static struct inode
*sel_make_inode(struct super_block
*sb
, int mode
)
1158 struct inode
*ret
= new_inode(sb
);
1162 ret
->i_atime
= ret
->i_mtime
= ret
->i_ctime
= current_time(ret
);
1167 static ssize_t
sel_read_bool(struct file
*filep
, char __user
*buf
,
1168 size_t count
, loff_t
*ppos
)
1170 struct selinux_fs_info
*fsi
= file_inode(filep
)->i_sb
->s_fs_info
;
1175 unsigned index
= file_inode(filep
)->i_ino
& SEL_INO_MASK
;
1176 const char *name
= filep
->f_path
.dentry
->d_name
.name
;
1178 mutex_lock(&fsi
->mutex
);
1181 if (index
>= fsi
->bool_num
|| strcmp(name
,
1182 fsi
->bool_pending_names
[index
]))
1186 page
= (char *)get_zeroed_page(GFP_KERNEL
);
1190 cur_enforcing
= security_get_bool_value(fsi
->state
, index
);
1191 if (cur_enforcing
< 0) {
1192 ret
= cur_enforcing
;
1195 length
= scnprintf(page
, PAGE_SIZE
, "%d %d", cur_enforcing
,
1196 fsi
->bool_pending_values
[index
]);
1197 mutex_unlock(&fsi
->mutex
);
1198 ret
= simple_read_from_buffer(buf
, count
, ppos
, page
, length
);
1200 free_page((unsigned long)page
);
1204 mutex_unlock(&fsi
->mutex
);
1208 static ssize_t
sel_write_bool(struct file
*filep
, const char __user
*buf
,
1209 size_t count
, loff_t
*ppos
)
1211 struct selinux_fs_info
*fsi
= file_inode(filep
)->i_sb
->s_fs_info
;
1215 unsigned index
= file_inode(filep
)->i_ino
& SEL_INO_MASK
;
1216 const char *name
= filep
->f_path
.dentry
->d_name
.name
;
1218 if (count
>= PAGE_SIZE
)
1221 /* No partial writes. */
1225 page
= memdup_user_nul(buf
, count
);
1227 return PTR_ERR(page
);
1229 mutex_lock(&fsi
->mutex
);
1231 length
= avc_has_perm(&selinux_state
,
1232 current_sid(), SECINITSID_SECURITY
,
1233 SECCLASS_SECURITY
, SECURITY__SETBOOL
,
1239 if (index
>= fsi
->bool_num
|| strcmp(name
,
1240 fsi
->bool_pending_names
[index
]))
1244 if (sscanf(page
, "%d", &new_value
) != 1)
1250 fsi
->bool_pending_values
[index
] = new_value
;
1254 mutex_unlock(&fsi
->mutex
);
1259 static const struct file_operations sel_bool_ops
= {
1260 .read
= sel_read_bool
,
1261 .write
= sel_write_bool
,
1262 .llseek
= generic_file_llseek
,
1265 static ssize_t
sel_commit_bools_write(struct file
*filep
,
1266 const char __user
*buf
,
1267 size_t count
, loff_t
*ppos
)
1269 struct selinux_fs_info
*fsi
= file_inode(filep
)->i_sb
->s_fs_info
;
1274 if (count
>= PAGE_SIZE
)
1277 /* No partial writes. */
1281 page
= memdup_user_nul(buf
, count
);
1283 return PTR_ERR(page
);
1285 mutex_lock(&fsi
->mutex
);
1287 length
= avc_has_perm(&selinux_state
,
1288 current_sid(), SECINITSID_SECURITY
,
1289 SECCLASS_SECURITY
, SECURITY__SETBOOL
,
1295 if (sscanf(page
, "%d", &new_value
) != 1)
1299 if (new_value
&& fsi
->bool_pending_values
)
1300 length
= security_set_bools(fsi
->state
, fsi
->bool_num
,
1301 fsi
->bool_pending_values
);
1307 mutex_unlock(&fsi
->mutex
);
1312 static const struct file_operations sel_commit_bools_ops
= {
1313 .write
= sel_commit_bools_write
,
1314 .llseek
= generic_file_llseek
,
1317 static void sel_remove_entries(struct dentry
*de
)
1320 shrink_dcache_parent(de
);
1323 #define BOOL_DIR_NAME "booleans"
1325 static int sel_make_bools(struct selinux_fs_info
*fsi
)
1329 struct dentry
*dentry
= NULL
;
1330 struct dentry
*dir
= fsi
->bool_dir
;
1331 struct inode
*inode
= NULL
;
1332 struct inode_security_struct
*isec
;
1333 char **names
= NULL
, *page
;
1338 /* remove any existing files */
1339 for (i
= 0; i
< fsi
->bool_num
; i
++)
1340 kfree(fsi
->bool_pending_names
[i
]);
1341 kfree(fsi
->bool_pending_names
);
1342 kfree(fsi
->bool_pending_values
);
1344 fsi
->bool_pending_names
= NULL
;
1345 fsi
->bool_pending_values
= NULL
;
1347 sel_remove_entries(dir
);
1350 page
= (char *)get_zeroed_page(GFP_KERNEL
);
1354 ret
= security_get_bools(fsi
->state
, &num
, &names
, &values
);
1358 for (i
= 0; i
< num
; i
++) {
1360 dentry
= d_alloc_name(dir
, names
[i
]);
1365 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
| S_IRUGO
| S_IWUSR
);
1371 ret
= -ENAMETOOLONG
;
1372 len
= snprintf(page
, PAGE_SIZE
, "/%s/%s", BOOL_DIR_NAME
, names
[i
]);
1373 if (len
>= PAGE_SIZE
) {
1379 isec
= selinux_inode(inode
);
1380 ret
= security_genfs_sid(fsi
->state
, "selinuxfs", page
,
1381 SECCLASS_FILE
, &sid
);
1383 pr_warn_ratelimited("SELinux: no sid found, defaulting to security isid for %s\n",
1385 sid
= SECINITSID_SECURITY
;
1389 isec
->initialized
= LABEL_INITIALIZED
;
1390 inode
->i_fop
= &sel_bool_ops
;
1391 inode
->i_ino
= i
|SEL_BOOL_INO_OFFSET
;
1392 d_add(dentry
, inode
);
1394 fsi
->bool_num
= num
;
1395 fsi
->bool_pending_names
= names
;
1396 fsi
->bool_pending_values
= values
;
1398 free_page((unsigned long)page
);
1401 free_page((unsigned long)page
);
1404 for (i
= 0; i
< num
; i
++)
1409 sel_remove_entries(dir
);
1414 static ssize_t
sel_read_avc_cache_threshold(struct file
*filp
, char __user
*buf
,
1415 size_t count
, loff_t
*ppos
)
1417 struct selinux_fs_info
*fsi
= file_inode(filp
)->i_sb
->s_fs_info
;
1418 struct selinux_state
*state
= fsi
->state
;
1419 char tmpbuf
[TMPBUFLEN
];
1422 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1423 avc_get_cache_threshold(state
->avc
));
1424 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1427 static ssize_t
sel_write_avc_cache_threshold(struct file
*file
,
1428 const char __user
*buf
,
1429 size_t count
, loff_t
*ppos
)
1432 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
1433 struct selinux_state
*state
= fsi
->state
;
1436 unsigned int new_value
;
1438 ret
= avc_has_perm(&selinux_state
,
1439 current_sid(), SECINITSID_SECURITY
,
1440 SECCLASS_SECURITY
, SECURITY__SETSECPARAM
,
1445 if (count
>= PAGE_SIZE
)
1448 /* No partial writes. */
1452 page
= memdup_user_nul(buf
, count
);
1454 return PTR_ERR(page
);
1457 if (sscanf(page
, "%u", &new_value
) != 1)
1460 avc_set_cache_threshold(state
->avc
, new_value
);
1468 static ssize_t
sel_read_avc_hash_stats(struct file
*filp
, char __user
*buf
,
1469 size_t count
, loff_t
*ppos
)
1471 struct selinux_fs_info
*fsi
= file_inode(filp
)->i_sb
->s_fs_info
;
1472 struct selinux_state
*state
= fsi
->state
;
1476 page
= (char *)__get_free_page(GFP_KERNEL
);
1480 length
= avc_get_hash_stats(state
->avc
, page
);
1482 length
= simple_read_from_buffer(buf
, count
, ppos
, page
, length
);
1483 free_page((unsigned long)page
);
1488 static const struct file_operations sel_avc_cache_threshold_ops
= {
1489 .read
= sel_read_avc_cache_threshold
,
1490 .write
= sel_write_avc_cache_threshold
,
1491 .llseek
= generic_file_llseek
,
1494 static const struct file_operations sel_avc_hash_stats_ops
= {
1495 .read
= sel_read_avc_hash_stats
,
1496 .llseek
= generic_file_llseek
,
1499 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1500 static struct avc_cache_stats
*sel_avc_get_stat_idx(loff_t
*idx
)
1504 for (cpu
= *idx
; cpu
< nr_cpu_ids
; ++cpu
) {
1505 if (!cpu_possible(cpu
))
1508 return &per_cpu(avc_cache_stats
, cpu
);
1513 static void *sel_avc_stats_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1515 loff_t n
= *pos
- 1;
1518 return SEQ_START_TOKEN
;
1520 return sel_avc_get_stat_idx(&n
);
1523 static void *sel_avc_stats_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1525 return sel_avc_get_stat_idx(pos
);
1528 static int sel_avc_stats_seq_show(struct seq_file
*seq
, void *v
)
1530 struct avc_cache_stats
*st
= v
;
1532 if (v
== SEQ_START_TOKEN
) {
1534 "lookups hits misses allocations reclaims frees\n");
1536 unsigned int lookups
= st
->lookups
;
1537 unsigned int misses
= st
->misses
;
1538 unsigned int hits
= lookups
- misses
;
1539 seq_printf(seq
, "%u %u %u %u %u %u\n", lookups
,
1540 hits
, misses
, st
->allocations
,
1541 st
->reclaims
, st
->frees
);
1546 static void sel_avc_stats_seq_stop(struct seq_file
*seq
, void *v
)
1549 static const struct seq_operations sel_avc_cache_stats_seq_ops
= {
1550 .start
= sel_avc_stats_seq_start
,
1551 .next
= sel_avc_stats_seq_next
,
1552 .show
= sel_avc_stats_seq_show
,
1553 .stop
= sel_avc_stats_seq_stop
,
1556 static int sel_open_avc_cache_stats(struct inode
*inode
, struct file
*file
)
1558 return seq_open(file
, &sel_avc_cache_stats_seq_ops
);
1561 static const struct file_operations sel_avc_cache_stats_ops
= {
1562 .open
= sel_open_avc_cache_stats
,
1564 .llseek
= seq_lseek
,
1565 .release
= seq_release
,
1569 static int sel_make_avc_files(struct dentry
*dir
)
1571 struct super_block
*sb
= dir
->d_sb
;
1572 struct selinux_fs_info
*fsi
= sb
->s_fs_info
;
1574 static const struct tree_descr files
[] = {
1575 { "cache_threshold",
1576 &sel_avc_cache_threshold_ops
, S_IRUGO
|S_IWUSR
},
1577 { "hash_stats", &sel_avc_hash_stats_ops
, S_IRUGO
},
1578 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
1579 { "cache_stats", &sel_avc_cache_stats_ops
, S_IRUGO
},
1583 for (i
= 0; i
< ARRAY_SIZE(files
); i
++) {
1584 struct inode
*inode
;
1585 struct dentry
*dentry
;
1587 dentry
= d_alloc_name(dir
, files
[i
].name
);
1591 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|files
[i
].mode
);
1597 inode
->i_fop
= files
[i
].ops
;
1598 inode
->i_ino
= ++fsi
->last_ino
;
1599 d_add(dentry
, inode
);
1605 static ssize_t
sel_read_initcon(struct file
*file
, char __user
*buf
,
1606 size_t count
, loff_t
*ppos
)
1608 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
1613 sid
= file_inode(file
)->i_ino
&SEL_INO_MASK
;
1614 ret
= security_sid_to_context(fsi
->state
, sid
, &con
, &len
);
1618 ret
= simple_read_from_buffer(buf
, count
, ppos
, con
, len
);
1623 static const struct file_operations sel_initcon_ops
= {
1624 .read
= sel_read_initcon
,
1625 .llseek
= generic_file_llseek
,
1628 static int sel_make_initcon_files(struct dentry
*dir
)
1632 for (i
= 1; i
<= SECINITSID_NUM
; i
++) {
1633 struct inode
*inode
;
1634 struct dentry
*dentry
;
1635 dentry
= d_alloc_name(dir
, security_get_initial_sid_context(i
));
1639 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|S_IRUGO
);
1645 inode
->i_fop
= &sel_initcon_ops
;
1646 inode
->i_ino
= i
|SEL_INITCON_INO_OFFSET
;
1647 d_add(dentry
, inode
);
1653 static inline unsigned long sel_class_to_ino(u16
class)
1655 return (class * (SEL_VEC_MAX
+ 1)) | SEL_CLASS_INO_OFFSET
;
1658 static inline u16
sel_ino_to_class(unsigned long ino
)
1660 return (ino
& SEL_INO_MASK
) / (SEL_VEC_MAX
+ 1);
1663 static inline unsigned long sel_perm_to_ino(u16
class, u32 perm
)
1665 return (class * (SEL_VEC_MAX
+ 1) + perm
) | SEL_CLASS_INO_OFFSET
;
1668 static inline u32
sel_ino_to_perm(unsigned long ino
)
1670 return (ino
& SEL_INO_MASK
) % (SEL_VEC_MAX
+ 1);
1673 static ssize_t
sel_read_class(struct file
*file
, char __user
*buf
,
1674 size_t count
, loff_t
*ppos
)
1676 unsigned long ino
= file_inode(file
)->i_ino
;
1677 char res
[TMPBUFLEN
];
1678 ssize_t len
= snprintf(res
, sizeof(res
), "%d", sel_ino_to_class(ino
));
1679 return simple_read_from_buffer(buf
, count
, ppos
, res
, len
);
1682 static const struct file_operations sel_class_ops
= {
1683 .read
= sel_read_class
,
1684 .llseek
= generic_file_llseek
,
1687 static ssize_t
sel_read_perm(struct file
*file
, char __user
*buf
,
1688 size_t count
, loff_t
*ppos
)
1690 unsigned long ino
= file_inode(file
)->i_ino
;
1691 char res
[TMPBUFLEN
];
1692 ssize_t len
= snprintf(res
, sizeof(res
), "%d", sel_ino_to_perm(ino
));
1693 return simple_read_from_buffer(buf
, count
, ppos
, res
, len
);
1696 static const struct file_operations sel_perm_ops
= {
1697 .read
= sel_read_perm
,
1698 .llseek
= generic_file_llseek
,
1701 static ssize_t
sel_read_policycap(struct file
*file
, char __user
*buf
,
1702 size_t count
, loff_t
*ppos
)
1704 struct selinux_fs_info
*fsi
= file_inode(file
)->i_sb
->s_fs_info
;
1706 char tmpbuf
[TMPBUFLEN
];
1708 unsigned long i_ino
= file_inode(file
)->i_ino
;
1710 value
= security_policycap_supported(fsi
->state
, i_ino
& SEL_INO_MASK
);
1711 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%d", value
);
1713 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1716 static const struct file_operations sel_policycap_ops
= {
1717 .read
= sel_read_policycap
,
1718 .llseek
= generic_file_llseek
,
1721 static int sel_make_perm_files(char *objclass
, int classvalue
,
1724 struct selinux_fs_info
*fsi
= dir
->d_sb
->s_fs_info
;
1728 rc
= security_get_permissions(fsi
->state
, objclass
, &perms
, &nperms
);
1732 for (i
= 0; i
< nperms
; i
++) {
1733 struct inode
*inode
;
1734 struct dentry
*dentry
;
1737 dentry
= d_alloc_name(dir
, perms
[i
]);
1742 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|S_IRUGO
);
1748 inode
->i_fop
= &sel_perm_ops
;
1749 /* i+1 since perm values are 1-indexed */
1750 inode
->i_ino
= sel_perm_to_ino(classvalue
, i
+ 1);
1751 d_add(dentry
, inode
);
1755 for (i
= 0; i
< nperms
; i
++)
1761 static int sel_make_class_dir_entries(char *classname
, int index
,
1764 struct super_block
*sb
= dir
->d_sb
;
1765 struct selinux_fs_info
*fsi
= sb
->s_fs_info
;
1766 struct dentry
*dentry
= NULL
;
1767 struct inode
*inode
= NULL
;
1770 dentry
= d_alloc_name(dir
, "index");
1774 inode
= sel_make_inode(dir
->d_sb
, S_IFREG
|S_IRUGO
);
1780 inode
->i_fop
= &sel_class_ops
;
1781 inode
->i_ino
= sel_class_to_ino(index
);
1782 d_add(dentry
, inode
);
1784 dentry
= sel_make_dir(dir
, "perms", &fsi
->last_class_ino
);
1786 return PTR_ERR(dentry
);
1788 rc
= sel_make_perm_files(classname
, index
, dentry
);
1793 static int sel_make_classes(struct selinux_fs_info
*fsi
)
1796 int rc
, nclasses
, i
;
1799 /* delete any existing entries */
1800 sel_remove_entries(fsi
->class_dir
);
1802 rc
= security_get_classes(fsi
->state
, &classes
, &nclasses
);
1806 /* +2 since classes are 1-indexed */
1807 fsi
->last_class_ino
= sel_class_to_ino(nclasses
+ 2);
1809 for (i
= 0; i
< nclasses
; i
++) {
1810 struct dentry
*class_name_dir
;
1812 class_name_dir
= sel_make_dir(fsi
->class_dir
, classes
[i
],
1813 &fsi
->last_class_ino
);
1814 if (IS_ERR(class_name_dir
)) {
1815 rc
= PTR_ERR(class_name_dir
);
1819 /* i+1 since class values are 1-indexed */
1820 rc
= sel_make_class_dir_entries(classes
[i
], i
+ 1,
1827 for (i
= 0; i
< nclasses
; i
++)
1833 static int sel_make_policycap(struct selinux_fs_info
*fsi
)
1836 struct dentry
*dentry
= NULL
;
1837 struct inode
*inode
= NULL
;
1839 sel_remove_entries(fsi
->policycap_dir
);
1841 for (iter
= 0; iter
<= POLICYDB_CAPABILITY_MAX
; iter
++) {
1842 if (iter
< ARRAY_SIZE(selinux_policycap_names
))
1843 dentry
= d_alloc_name(fsi
->policycap_dir
,
1844 selinux_policycap_names
[iter
]);
1846 dentry
= d_alloc_name(fsi
->policycap_dir
, "unknown");
1851 inode
= sel_make_inode(fsi
->sb
, S_IFREG
| 0444);
1852 if (inode
== NULL
) {
1857 inode
->i_fop
= &sel_policycap_ops
;
1858 inode
->i_ino
= iter
| SEL_POLICYCAP_INO_OFFSET
;
1859 d_add(dentry
, inode
);
1865 static struct dentry
*sel_make_dir(struct dentry
*dir
, const char *name
,
1868 struct dentry
*dentry
= d_alloc_name(dir
, name
);
1869 struct inode
*inode
;
1872 return ERR_PTR(-ENOMEM
);
1874 inode
= sel_make_inode(dir
->d_sb
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
1877 return ERR_PTR(-ENOMEM
);
1880 inode
->i_op
= &simple_dir_inode_operations
;
1881 inode
->i_fop
= &simple_dir_operations
;
1882 inode
->i_ino
= ++(*ino
);
1883 /* directory inodes start off with i_nlink == 2 (for "." entry) */
1885 d_add(dentry
, inode
);
1886 /* bump link count on parent directory, too */
1887 inc_nlink(d_inode(dir
));
1892 #define NULL_FILE_NAME "null"
1894 static int sel_fill_super(struct super_block
*sb
, void *data
, int silent
)
1896 struct selinux_fs_info
*fsi
;
1898 struct dentry
*dentry
;
1899 struct inode
*inode
;
1900 struct inode_security_struct
*isec
;
1902 static const struct tree_descr selinux_files
[] = {
1903 [SEL_LOAD
] = {"load", &sel_load_ops
, S_IRUSR
|S_IWUSR
},
1904 [SEL_ENFORCE
] = {"enforce", &sel_enforce_ops
, S_IRUGO
|S_IWUSR
},
1905 [SEL_CONTEXT
] = {"context", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1906 [SEL_ACCESS
] = {"access", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1907 [SEL_CREATE
] = {"create", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1908 [SEL_RELABEL
] = {"relabel", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1909 [SEL_USER
] = {"user", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1910 [SEL_POLICYVERS
] = {"policyvers", &sel_policyvers_ops
, S_IRUGO
},
1911 [SEL_COMMIT_BOOLS
] = {"commit_pending_bools", &sel_commit_bools_ops
, S_IWUSR
},
1912 [SEL_MLS
] = {"mls", &sel_mls_ops
, S_IRUGO
},
1913 [SEL_DISABLE
] = {"disable", &sel_disable_ops
, S_IWUSR
},
1914 [SEL_MEMBER
] = {"member", &transaction_ops
, S_IRUGO
|S_IWUGO
},
1915 [SEL_CHECKREQPROT
] = {"checkreqprot", &sel_checkreqprot_ops
, S_IRUGO
|S_IWUSR
},
1916 [SEL_REJECT_UNKNOWN
] = {"reject_unknown", &sel_handle_unknown_ops
, S_IRUGO
},
1917 [SEL_DENY_UNKNOWN
] = {"deny_unknown", &sel_handle_unknown_ops
, S_IRUGO
},
1918 [SEL_STATUS
] = {"status", &sel_handle_status_ops
, S_IRUGO
},
1919 [SEL_POLICY
] = {"policy", &sel_policy_ops
, S_IRUGO
},
1920 [SEL_VALIDATE_TRANS
] = {"validatetrans", &sel_transition_ops
,
1925 ret
= selinux_fs_info_create(sb
);
1929 ret
= simple_fill_super(sb
, SELINUX_MAGIC
, selinux_files
);
1933 fsi
= sb
->s_fs_info
;
1934 fsi
->bool_dir
= sel_make_dir(sb
->s_root
, BOOL_DIR_NAME
, &fsi
->last_ino
);
1935 if (IS_ERR(fsi
->bool_dir
)) {
1936 ret
= PTR_ERR(fsi
->bool_dir
);
1937 fsi
->bool_dir
= NULL
;
1942 dentry
= d_alloc_name(sb
->s_root
, NULL_FILE_NAME
);
1947 inode
= sel_make_inode(sb
, S_IFCHR
| S_IRUGO
| S_IWUGO
);
1953 inode
->i_ino
= ++fsi
->last_ino
;
1954 isec
= selinux_inode(inode
);
1955 isec
->sid
= SECINITSID_DEVNULL
;
1956 isec
->sclass
= SECCLASS_CHR_FILE
;
1957 isec
->initialized
= LABEL_INITIALIZED
;
1959 init_special_inode(inode
, S_IFCHR
| S_IRUGO
| S_IWUGO
, MKDEV(MEM_MAJOR
, 3));
1960 d_add(dentry
, inode
);
1962 dentry
= sel_make_dir(sb
->s_root
, "avc", &fsi
->last_ino
);
1963 if (IS_ERR(dentry
)) {
1964 ret
= PTR_ERR(dentry
);
1968 ret
= sel_make_avc_files(dentry
);
1972 dentry
= sel_make_dir(sb
->s_root
, "initial_contexts", &fsi
->last_ino
);
1973 if (IS_ERR(dentry
)) {
1974 ret
= PTR_ERR(dentry
);
1978 ret
= sel_make_initcon_files(dentry
);
1982 fsi
->class_dir
= sel_make_dir(sb
->s_root
, "class", &fsi
->last_ino
);
1983 if (IS_ERR(fsi
->class_dir
)) {
1984 ret
= PTR_ERR(fsi
->class_dir
);
1985 fsi
->class_dir
= NULL
;
1989 fsi
->policycap_dir
= sel_make_dir(sb
->s_root
, "policy_capabilities",
1991 if (IS_ERR(fsi
->policycap_dir
)) {
1992 ret
= PTR_ERR(fsi
->policycap_dir
);
1993 fsi
->policycap_dir
= NULL
;
1997 ret
= sel_make_policy_nodes(fsi
);
2002 pr_err("SELinux: %s: failed while creating inodes\n",
2005 selinux_fs_info_free(sb
);
2010 static struct dentry
*sel_mount(struct file_system_type
*fs_type
,
2011 int flags
, const char *dev_name
, void *data
)
2013 return mount_single(fs_type
, flags
, data
, sel_fill_super
);
2016 static void sel_kill_sb(struct super_block
*sb
)
2018 selinux_fs_info_free(sb
);
2019 kill_litter_super(sb
);
2022 static struct file_system_type sel_fs_type
= {
2023 .name
= "selinuxfs",
2025 .kill_sb
= sel_kill_sb
,
2028 struct vfsmount
*selinuxfs_mount
;
2029 struct path selinux_null
;
2031 static int __init
init_sel_fs(void)
2033 struct qstr null_name
= QSTR_INIT(NULL_FILE_NAME
,
2034 sizeof(NULL_FILE_NAME
)-1);
2037 if (!selinux_enabled
)
2040 err
= sysfs_create_mount_point(fs_kobj
, "selinux");
2044 err
= register_filesystem(&sel_fs_type
);
2046 sysfs_remove_mount_point(fs_kobj
, "selinux");
2050 selinux_null
.mnt
= selinuxfs_mount
= kern_mount(&sel_fs_type
);
2051 if (IS_ERR(selinuxfs_mount
)) {
2052 pr_err("selinuxfs: could not mount!\n");
2053 err
= PTR_ERR(selinuxfs_mount
);
2054 selinuxfs_mount
= NULL
;
2056 selinux_null
.dentry
= d_hash_and_lookup(selinux_null
.mnt
->mnt_root
,
2058 if (IS_ERR(selinux_null
.dentry
)) {
2059 pr_err("selinuxfs: could not lookup null!\n");
2060 err
= PTR_ERR(selinux_null
.dentry
);
2061 selinux_null
.dentry
= NULL
;
2067 __initcall(init_sel_fs
);
2069 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
2070 void exit_sel_fs(void)
2072 sysfs_remove_mount_point(fs_kobj
, "selinux");
2073 dput(selinux_null
.dentry
);
2074 kern_unmount(selinuxfs_mount
);
2075 unregister_filesystem(&sel_fs_type
);