2 * AppArmor security module
4 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
15 #include <linux/ctype.h>
16 #include <linux/security.h>
17 #include <linux/vmalloc.h>
18 #include <linux/module.h>
19 #include <linux/seq_file.h>
20 #include <linux/uaccess.h>
21 #include <linux/mount.h>
22 #include <linux/namei.h>
23 #include <linux/capability.h>
24 #include <linux/rcupdate.h>
26 #include <linux/poll.h>
27 #include <uapi/linux/major.h>
28 #include <uapi/linux/magic.h>
30 #include "include/apparmor.h"
31 #include "include/apparmorfs.h"
32 #include "include/audit.h"
33 #include "include/context.h"
34 #include "include/crypto.h"
35 #include "include/ipc.h"
36 #include "include/policy_ns.h"
37 #include "include/label.h"
38 #include "include/policy.h"
39 #include "include/policy_ns.h"
40 #include "include/resource.h"
41 #include "include/policy_unpack.h"
44 * The apparmor filesystem interface used for policy load and introspection
45 * The interface is split into two main components based on their function
46 * a securityfs component:
47 * used for static files that are always available, and which allows
48 * userspace to specificy the location of the security filesystem.
50 * fns and data are prefixed with
53 * an apparmorfs component:
54 * used loaded policy content and introspection. It is not part of a
55 * regular mounted filesystem and is available only through the magic
56 * policy symlink in the root of the securityfs apparmor/ directory.
57 * Tasks queries will be magically redirected to the correct portion
58 * of the policy tree based on their confinement.
60 * fns and data are prefixed with
63 * The aa_fs_ prefix is used to indicate the fn is used by both the
64 * securityfs and apparmorfs filesystems.
73 * aa_mangle_name - mangle a profile name to std profile layout form
74 * @name: profile name to mangle (NOT NULL)
75 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
77 * Returns: length of mangled name
79 static int mangle_name(const char *name
, char *target
)
83 while (*name
== '/' || *name
== '.')
87 for (; *name
; name
++) {
90 else if (isspace(*name
))
92 else if (isalnum(*name
) || strchr("._-", *name
))
99 for (; *name
; name
++) {
100 if (isalnum(*name
) || isspace(*name
) ||
101 strchr("/._-", *name
))
113 * aafs - core fns and data for the policy tree
116 #define AAFS_NAME "apparmorfs"
117 static struct vfsmount
*aafs_mnt
;
118 static int aafs_count
;
121 static int aafs_show_path(struct seq_file
*seq
, struct dentry
*dentry
)
123 struct inode
*inode
= d_inode(dentry
);
125 seq_printf(seq
, "%s:[%lu]", AAFS_NAME
, inode
->i_ino
);
129 static void aafs_i_callback(struct rcu_head
*head
)
131 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
132 if (S_ISLNK(inode
->i_mode
))
133 kfree(inode
->i_link
);
134 free_inode_nonrcu(inode
);
137 static void aafs_destroy_inode(struct inode
*inode
)
139 call_rcu(&inode
->i_rcu
, aafs_i_callback
);
142 static const struct super_operations aafs_super_ops
= {
143 .statfs
= simple_statfs
,
144 .destroy_inode
= aafs_destroy_inode
,
145 .show_path
= aafs_show_path
,
148 static int fill_super(struct super_block
*sb
, void *data
, int silent
)
150 static struct tree_descr files
[] = { {""} };
153 error
= simple_fill_super(sb
, AAFS_MAGIC
, files
);
156 sb
->s_op
= &aafs_super_ops
;
161 static struct dentry
*aafs_mount(struct file_system_type
*fs_type
,
162 int flags
, const char *dev_name
, void *data
)
164 return mount_single(fs_type
, flags
, data
, fill_super
);
167 static struct file_system_type aafs_ops
= {
168 .owner
= THIS_MODULE
,
171 .kill_sb
= kill_anon_super
,
175 * __aafs_setup_d_inode - basic inode setup for apparmorfs
176 * @dir: parent directory for the dentry
177 * @dentry: dentry we are seting the inode up for
178 * @mode: permissions the file should have
179 * @data: data to store on inode.i_private, available in open()
180 * @link: if symlink, symlink target string
181 * @fops: struct file_operations that should be used
182 * @iops: struct of inode_operations that should be used
184 static int __aafs_setup_d_inode(struct inode
*dir
, struct dentry
*dentry
,
185 umode_t mode
, void *data
, char *link
,
186 const struct file_operations
*fops
,
187 const struct inode_operations
*iops
)
189 struct inode
*inode
= new_inode(dir
->i_sb
);
197 inode
->i_ino
= get_next_ino();
198 inode
->i_mode
= mode
;
199 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
200 inode
->i_private
= data
;
202 inode
->i_op
= iops
? iops
: &simple_dir_inode_operations
;
203 inode
->i_fop
= &simple_dir_operations
;
206 } else if (S_ISLNK(mode
)) {
207 inode
->i_op
= iops
? iops
: &simple_symlink_inode_operations
;
208 inode
->i_link
= link
;
212 d_instantiate(dentry
, inode
);
219 * aafs_create - create a dentry in the apparmorfs filesystem
221 * @name: name of dentry to create
222 * @mode: permissions the file should have
223 * @parent: parent directory for this dentry
224 * @data: data to store on inode.i_private, available in open()
225 * @link: if symlink, symlink target string
226 * @fops: struct file_operations that should be used for
227 * @iops: struct of inode_operations that should be used
229 * This is the basic "create a xxx" function for apparmorfs.
231 * Returns a pointer to a dentry if it succeeds, that must be free with
232 * aafs_remove(). Will return ERR_PTR on failure.
234 static struct dentry
*aafs_create(const char *name
, umode_t mode
,
235 struct dentry
*parent
, void *data
, void *link
,
236 const struct file_operations
*fops
,
237 const struct inode_operations
*iops
)
239 struct dentry
*dentry
;
246 if (!(mode
& S_IFMT
))
247 mode
= (mode
& S_IALLUGO
) | S_IFREG
;
249 error
= simple_pin_fs(&aafs_ops
, &aafs_mnt
, &aafs_count
);
251 return ERR_PTR(error
);
253 dir
= d_inode(parent
);
256 dentry
= lookup_one_len(name
, parent
, strlen(name
));
257 if (IS_ERR(dentry
)) {
258 error
= PTR_ERR(dentry
);
262 if (d_really_is_positive(dentry
)) {
267 error
= __aafs_setup_d_inode(dir
, dentry
, mode
, data
, link
, fops
, iops
);
279 simple_release_fs(&aafs_mnt
, &aafs_count
);
281 return ERR_PTR(error
);
285 * aafs_create_file - create a file in the apparmorfs filesystem
287 * @name: name of dentry to create
288 * @mode: permissions the file should have
289 * @parent: parent directory for this dentry
290 * @data: data to store on inode.i_private, available in open()
291 * @fops: struct file_operations that should be used for
295 static struct dentry
*aafs_create_file(const char *name
, umode_t mode
,
296 struct dentry
*parent
, void *data
,
297 const struct file_operations
*fops
)
299 return aafs_create(name
, mode
, parent
, data
, NULL
, fops
, NULL
);
303 * aafs_create_dir - create a directory in the apparmorfs filesystem
305 * @name: name of dentry to create
306 * @parent: parent directory for this dentry
310 static struct dentry
*aafs_create_dir(const char *name
, struct dentry
*parent
)
312 return aafs_create(name
, S_IFDIR
| 0755, parent
, NULL
, NULL
, NULL
,
317 * aafs_create_symlink - create a symlink in the apparmorfs filesystem
318 * @name: name of dentry to create
319 * @parent: parent directory for this dentry
320 * @target: if symlink, symlink target string
321 * @private: private data
322 * @iops: struct of inode_operations that should be used
324 * If @target parameter is %NULL, then the @iops parameter needs to be
325 * setup to handle .readlink and .get_link inode_operations.
327 static struct dentry
*aafs_create_symlink(const char *name
,
328 struct dentry
*parent
,
331 const struct inode_operations
*iops
)
338 return ERR_PTR(-ENOMEM
);
340 dent
= aafs_create(name
, S_IFLNK
| 0444, parent
, private, link
, NULL
,
349 * aafs_remove - removes a file or directory from the apparmorfs filesystem
351 * @dentry: dentry of the file/directory/symlink to removed.
353 static void aafs_remove(struct dentry
*dentry
)
357 if (!dentry
|| IS_ERR(dentry
))
360 dir
= d_inode(dentry
->d_parent
);
362 if (simple_positive(dentry
)) {
363 if (d_is_dir(dentry
))
364 simple_rmdir(dir
, dentry
);
366 simple_unlink(dir
, dentry
);
370 simple_release_fs(&aafs_mnt
, &aafs_count
);
375 * aa_fs - policy load/replace/remove
379 * aa_simple_write_to_buffer - common routine for getting policy from user
380 * @userbuf: user buffer to copy data from (NOT NULL)
381 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
382 * @copy_size: size of data to copy from user buffer
383 * @pos: position write is at in the file (NOT NULL)
385 * Returns: kernel buffer containing copy of user buffer data or an
386 * ERR_PTR on failure.
388 static struct aa_loaddata
*aa_simple_write_to_buffer(const char __user
*userbuf
,
393 struct aa_loaddata
*data
;
395 AA_BUG(copy_size
> alloc_size
);
398 /* only writes from pos 0, that is complete writes */
399 return ERR_PTR(-ESPIPE
);
401 /* freed by caller to simple_write_to_buffer */
402 data
= aa_loaddata_alloc(alloc_size
);
406 data
->size
= copy_size
;
407 if (copy_from_user(data
->data
, userbuf
, copy_size
)) {
409 return ERR_PTR(-EFAULT
);
415 static ssize_t
policy_update(u32 mask
, const char __user
*buf
, size_t size
,
416 loff_t
*pos
, struct aa_ns
*ns
)
418 struct aa_loaddata
*data
;
419 struct aa_label
*label
;
422 label
= begin_current_label_crit_section();
424 /* high level check about policy management - fine grained in
427 error
= aa_may_manage_policy(label
, ns
, mask
);
431 data
= aa_simple_write_to_buffer(buf
, size
, size
, pos
);
432 error
= PTR_ERR(data
);
434 error
= aa_replace_profiles(ns
, label
, mask
, data
);
435 aa_put_loaddata(data
);
437 end_current_label_crit_section(label
);
442 /* .load file hook fn to load policy */
443 static ssize_t
profile_load(struct file
*f
, const char __user
*buf
, size_t size
,
446 struct aa_ns
*ns
= aa_get_ns(f
->f_inode
->i_private
);
447 int error
= policy_update(AA_MAY_LOAD_POLICY
, buf
, size
, pos
, ns
);
454 static const struct file_operations aa_fs_profile_load
= {
455 .write
= profile_load
,
456 .llseek
= default_llseek
,
459 /* .replace file hook fn to load and/or replace policy */
460 static ssize_t
profile_replace(struct file
*f
, const char __user
*buf
,
461 size_t size
, loff_t
*pos
)
463 struct aa_ns
*ns
= aa_get_ns(f
->f_inode
->i_private
);
464 int error
= policy_update(AA_MAY_LOAD_POLICY
| AA_MAY_REPLACE_POLICY
,
471 static const struct file_operations aa_fs_profile_replace
= {
472 .write
= profile_replace
,
473 .llseek
= default_llseek
,
476 /* .remove file hook fn to remove loaded policy */
477 static ssize_t
profile_remove(struct file
*f
, const char __user
*buf
,
478 size_t size
, loff_t
*pos
)
480 struct aa_loaddata
*data
;
481 struct aa_label
*label
;
483 struct aa_ns
*ns
= aa_get_ns(f
->f_inode
->i_private
);
485 label
= begin_current_label_crit_section();
486 /* high level check about policy management - fine grained in
489 error
= aa_may_manage_policy(label
, ns
, AA_MAY_REMOVE_POLICY
);
494 * aa_remove_profile needs a null terminated string so 1 extra
495 * byte is allocated and the copied data is null terminated.
497 data
= aa_simple_write_to_buffer(buf
, size
+ 1, size
, pos
);
499 error
= PTR_ERR(data
);
501 data
->data
[size
] = 0;
502 error
= aa_remove_profiles(ns
, label
, data
->data
, size
);
503 aa_put_loaddata(data
);
506 end_current_label_crit_section(label
);
511 static const struct file_operations aa_fs_profile_remove
= {
512 .write
= profile_remove
,
513 .llseek
= default_llseek
,
521 /* revision file hook fn for policy loads */
522 static int ns_revision_release(struct inode
*inode
, struct file
*file
)
524 struct aa_revision
*rev
= file
->private_data
;
534 static ssize_t
ns_revision_read(struct file
*file
, char __user
*buf
,
535 size_t size
, loff_t
*ppos
)
537 struct aa_revision
*rev
= file
->private_data
;
542 mutex_lock_nested(&rev
->ns
->lock
, rev
->ns
->level
);
543 last_read
= rev
->last_read
;
544 if (last_read
== rev
->ns
->revision
) {
545 mutex_unlock(&rev
->ns
->lock
);
546 if (file
->f_flags
& O_NONBLOCK
)
548 if (wait_event_interruptible(rev
->ns
->wait
,
550 READ_ONCE(rev
->ns
->revision
)))
552 mutex_lock_nested(&rev
->ns
->lock
, rev
->ns
->level
);
555 avail
= sprintf(buffer
, "%ld\n", rev
->ns
->revision
);
556 if (*ppos
+ size
> avail
) {
557 rev
->last_read
= rev
->ns
->revision
;
560 mutex_unlock(&rev
->ns
->lock
);
562 return simple_read_from_buffer(buf
, size
, ppos
, buffer
, avail
);
565 static int ns_revision_open(struct inode
*inode
, struct file
*file
)
567 struct aa_revision
*rev
= kzalloc(sizeof(*rev
), GFP_KERNEL
);
572 rev
->ns
= aa_get_ns(inode
->i_private
);
574 rev
->ns
= aa_get_current_ns();
575 file
->private_data
= rev
;
580 static unsigned int ns_revision_poll(struct file
*file
, poll_table
*pt
)
582 struct aa_revision
*rev
= file
->private_data
;
583 unsigned int mask
= 0;
586 mutex_lock_nested(&rev
->ns
->lock
, rev
->ns
->level
);
587 poll_wait(file
, &rev
->ns
->wait
, pt
);
588 if (rev
->last_read
< rev
->ns
->revision
)
589 mask
|= POLLIN
| POLLRDNORM
;
590 mutex_unlock(&rev
->ns
->lock
);
596 void __aa_bump_ns_revision(struct aa_ns
*ns
)
599 wake_up_interruptible(&ns
->wait
);
602 static const struct file_operations aa_fs_ns_revision_fops
= {
603 .owner
= THIS_MODULE
,
604 .open
= ns_revision_open
,
605 .poll
= ns_revision_poll
,
606 .read
= ns_revision_read
,
607 .llseek
= generic_file_llseek
,
608 .release
= ns_revision_release
,
611 static void profile_query_cb(struct aa_profile
*profile
, struct aa_perms
*perms
,
612 const char *match_str
, size_t match_len
)
616 unsigned int state
= 0;
618 if (profile_unconfined(profile
))
620 if (profile
->file
.dfa
&& *match_str
== AA_CLASS_FILE
) {
621 dfa
= profile
->file
.dfa
;
622 state
= aa_dfa_match_len(dfa
, profile
->file
.start
,
623 match_str
+ 1, match_len
- 1);
626 struct path_cond cond
= { };
628 tmp
= aa_compute_fperms(dfa
, state
, &cond
);
630 } else if (profile
->policy
.dfa
) {
631 if (!PROFILE_MEDIATES_SAFE(profile
, *match_str
))
632 return; /* no change to current perms */
633 dfa
= profile
->policy
.dfa
;
634 state
= aa_dfa_match_len(dfa
, profile
->policy
.start
[0],
635 match_str
, match_len
);
637 aa_compute_perms(dfa
, state
, &tmp
);
641 aa_apply_modes_to_perms(profile
, &tmp
);
642 aa_perms_accum_raw(perms
, &tmp
);
647 * query_data - queries a policy and writes its data to buf
648 * @buf: the resulting data is stored here (NOT NULL)
649 * @buf_len: size of buf
650 * @query: query string used to retrieve data
651 * @query_len: size of query including second NUL byte
653 * The buffers pointed to by buf and query may overlap. The query buffer is
654 * parsed before buf is written to.
656 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
657 * the security confinement context and <KEY> is the name of the data to
658 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
660 * Don't expect the contents of buf to be preserved on failure.
662 * Returns: number of characters written to buf or -errno on failure
664 static ssize_t
query_data(char *buf
, size_t buf_len
,
665 char *query
, size_t query_len
)
670 struct aa_label
*label
, *curr
;
671 struct aa_profile
*profile
;
672 struct aa_data
*data
;
677 return -EINVAL
; /* need a query */
679 key
= query
+ strnlen(query
, query_len
) + 1;
680 if (key
+ 1 >= query
+ query_len
)
681 return -EINVAL
; /* not enough space for a non-empty key */
682 if (key
+ strnlen(key
, query
+ query_len
- key
) >= query
+ query_len
)
683 return -EINVAL
; /* must end with NUL */
685 if (buf_len
< sizeof(bytes
) + sizeof(blocks
))
686 return -EINVAL
; /* not enough space */
688 curr
= begin_current_label_crit_section();
689 label
= aa_label_parse(curr
, query
, GFP_KERNEL
, false, false);
690 end_current_label_crit_section(curr
);
692 return PTR_ERR(label
);
694 /* We are going to leave space for two numbers. The first is the total
695 * number of bytes we are writing after the first number. This is so
696 * users can read the full output without reallocation.
698 * The second number is the number of data blocks we're writing. An
699 * application might be confined by multiple policies having data in
702 memset(buf
, 0, sizeof(bytes
) + sizeof(blocks
));
703 out
= buf
+ sizeof(bytes
) + sizeof(blocks
);
706 label_for_each_confined(i
, label
, profile
) {
710 data
= rhashtable_lookup_fast(profile
->data
, &key
,
714 if (out
+ sizeof(outle32
) + data
->size
> buf
+
717 return -EINVAL
; /* not enough space */
719 outle32
= __cpu_to_le32(data
->size
);
720 memcpy(out
, &outle32
, sizeof(outle32
));
721 out
+= sizeof(outle32
);
722 memcpy(out
, data
->data
, data
->size
);
729 outle32
= __cpu_to_le32(out
- buf
- sizeof(bytes
));
730 memcpy(buf
, &outle32
, sizeof(outle32
));
731 outle32
= __cpu_to_le32(blocks
);
732 memcpy(buf
+ sizeof(bytes
), &outle32
, sizeof(outle32
));
738 * query_label - queries a label and writes permissions to buf
739 * @buf: the resulting permissions string is stored here (NOT NULL)
740 * @buf_len: size of buf
741 * @query: binary query string to match against the dfa
742 * @query_len: size of query
743 * @view_only: only compute for querier's view
745 * The buffers pointed to by buf and query may overlap. The query buffer is
746 * parsed before buf is written to.
748 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
749 * the name of the label, in the current namespace, that is to be queried and
750 * DFA_STRING is a binary string to match against the label(s)'s DFA.
752 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
753 * but must *not* be NUL terminated.
755 * Returns: number of characters written to buf or -errno on failure
757 static ssize_t
query_label(char *buf
, size_t buf_len
,
758 char *query
, size_t query_len
, bool view_only
)
760 struct aa_profile
*profile
;
761 struct aa_label
*label
, *curr
;
762 char *label_name
, *match_str
;
763 size_t label_name_len
, match_len
;
764 struct aa_perms perms
;
771 label_name_len
= strnlen(query
, query_len
);
772 if (!label_name_len
|| label_name_len
== query_len
)
776 * The extra byte is to account for the null byte between the
777 * profile name and dfa string. profile_name_len is greater
778 * than zero and less than query_len, so a byte can be safely
779 * added or subtracted.
781 match_str
= label_name
+ label_name_len
+ 1;
782 match_len
= query_len
- label_name_len
- 1;
784 curr
= begin_current_label_crit_section();
785 label
= aa_label_parse(curr
, label_name
, GFP_KERNEL
, false, false);
786 end_current_label_crit_section(curr
);
788 return PTR_ERR(label
);
792 label_for_each_in_ns(i
, labels_ns(label
), label
, profile
) {
793 profile_query_cb(profile
, &perms
, match_str
, match_len
);
796 label_for_each(i
, label
, profile
) {
797 profile_query_cb(profile
, &perms
, match_str
, match_len
);
802 return scnprintf(buf
, buf_len
,
803 "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
804 perms
.allow
, perms
.deny
, perms
.audit
, perms
.quiet
);
808 * Transaction based IO.
809 * The file expects a write which triggers the transaction, and then
810 * possibly a read(s) which collects the result - which is stored in a
811 * file-local buffer. Once a new write is performed, a new set of results
812 * are stored in the file-local buffer.
814 struct multi_transaction
{
820 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
821 /* TODO: replace with per file lock */
822 static DEFINE_SPINLOCK(multi_transaction_lock
);
824 static void multi_transaction_kref(struct kref
*kref
)
826 struct multi_transaction
*t
;
828 t
= container_of(kref
, struct multi_transaction
, count
);
829 free_page((unsigned long) t
);
832 static struct multi_transaction
*
833 get_multi_transaction(struct multi_transaction
*t
)
836 kref_get(&(t
->count
));
841 static void put_multi_transaction(struct multi_transaction
*t
)
844 kref_put(&(t
->count
), multi_transaction_kref
);
847 /* does not increment @new's count */
848 static void multi_transaction_set(struct file
*file
,
849 struct multi_transaction
*new, size_t n
)
851 struct multi_transaction
*old
;
853 AA_BUG(n
> MULTI_TRANSACTION_LIMIT
);
856 spin_lock(&multi_transaction_lock
);
857 old
= (struct multi_transaction
*) file
->private_data
;
858 file
->private_data
= new;
859 spin_unlock(&multi_transaction_lock
);
860 put_multi_transaction(old
);
863 static struct multi_transaction
*multi_transaction_new(struct file
*file
,
864 const char __user
*buf
,
867 struct multi_transaction
*t
;
869 if (size
> MULTI_TRANSACTION_LIMIT
- 1)
870 return ERR_PTR(-EFBIG
);
872 t
= (struct multi_transaction
*)get_zeroed_page(GFP_KERNEL
);
874 return ERR_PTR(-ENOMEM
);
875 kref_init(&t
->count
);
876 if (copy_from_user(t
->data
, buf
, size
))
877 return ERR_PTR(-EFAULT
);
882 static ssize_t
multi_transaction_read(struct file
*file
, char __user
*buf
,
883 size_t size
, loff_t
*pos
)
885 struct multi_transaction
*t
;
888 spin_lock(&multi_transaction_lock
);
889 t
= get_multi_transaction(file
->private_data
);
890 spin_unlock(&multi_transaction_lock
);
894 ret
= simple_read_from_buffer(buf
, size
, pos
, t
->data
, t
->size
);
895 put_multi_transaction(t
);
900 static int multi_transaction_release(struct inode
*inode
, struct file
*file
)
902 put_multi_transaction(file
->private_data
);
907 #define QUERY_CMD_LABEL "label\0"
908 #define QUERY_CMD_LABEL_LEN 6
909 #define QUERY_CMD_PROFILE "profile\0"
910 #define QUERY_CMD_PROFILE_LEN 8
911 #define QUERY_CMD_LABELALL "labelall\0"
912 #define QUERY_CMD_LABELALL_LEN 9
913 #define QUERY_CMD_DATA "data\0"
914 #define QUERY_CMD_DATA_LEN 5
917 * aa_write_access - generic permissions and data query
918 * @file: pointer to open apparmorfs/access file
919 * @ubuf: user buffer containing the complete query string (NOT NULL)
920 * @count: size of ubuf
921 * @ppos: position in the file (MUST BE ZERO)
923 * Allows for one permissions or data query per open(), write(), and read()
924 * sequence. The only queries currently supported are label-based queries for
925 * permissions or data.
927 * For permissions queries, ubuf must begin with "label\0", followed by the
928 * profile query specific format described in the query_label() function
931 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
932 * <LABEL> is the name of the security confinement context and <KEY> is the
933 * name of the data to retrieve.
935 * Returns: number of bytes written or -errno on failure
937 static ssize_t
aa_write_access(struct file
*file
, const char __user
*ubuf
,
938 size_t count
, loff_t
*ppos
)
940 struct multi_transaction
*t
;
946 t
= multi_transaction_new(file
, ubuf
, count
);
950 if (count
> QUERY_CMD_PROFILE_LEN
&&
951 !memcmp(t
->data
, QUERY_CMD_PROFILE
, QUERY_CMD_PROFILE_LEN
)) {
952 len
= query_label(t
->data
, MULTI_TRANSACTION_LIMIT
,
953 t
->data
+ QUERY_CMD_PROFILE_LEN
,
954 count
- QUERY_CMD_PROFILE_LEN
, true);
955 } else if (count
> QUERY_CMD_LABEL_LEN
&&
956 !memcmp(t
->data
, QUERY_CMD_LABEL
, QUERY_CMD_LABEL_LEN
)) {
957 len
= query_label(t
->data
, MULTI_TRANSACTION_LIMIT
,
958 t
->data
+ QUERY_CMD_LABEL_LEN
,
959 count
- QUERY_CMD_LABEL_LEN
, true);
960 } else if (count
> QUERY_CMD_LABELALL_LEN
&&
961 !memcmp(t
->data
, QUERY_CMD_LABELALL
,
962 QUERY_CMD_LABELALL_LEN
)) {
963 len
= query_label(t
->data
, MULTI_TRANSACTION_LIMIT
,
964 t
->data
+ QUERY_CMD_LABELALL_LEN
,
965 count
- QUERY_CMD_LABELALL_LEN
, false);
966 } else if (count
> QUERY_CMD_DATA_LEN
&&
967 !memcmp(t
->data
, QUERY_CMD_DATA
, QUERY_CMD_DATA_LEN
)) {
968 len
= query_data(t
->data
, MULTI_TRANSACTION_LIMIT
,
969 t
->data
+ QUERY_CMD_DATA_LEN
,
970 count
- QUERY_CMD_DATA_LEN
);
975 put_multi_transaction(t
);
979 multi_transaction_set(file
, t
, len
);
984 static const struct file_operations aa_sfs_access
= {
985 .write
= aa_write_access
,
986 .read
= multi_transaction_read
,
987 .release
= multi_transaction_release
,
988 .llseek
= generic_file_llseek
,
991 static int aa_sfs_seq_show(struct seq_file
*seq
, void *v
)
993 struct aa_sfs_entry
*fs_file
= seq
->private;
998 switch (fs_file
->v_type
) {
999 case AA_SFS_TYPE_BOOLEAN
:
1000 seq_printf(seq
, "%s\n", fs_file
->v
.boolean
? "yes" : "no");
1002 case AA_SFS_TYPE_STRING
:
1003 seq_printf(seq
, "%s\n", fs_file
->v
.string
);
1005 case AA_SFS_TYPE_U64
:
1006 seq_printf(seq
, "%#08lx\n", fs_file
->v
.u64
);
1009 /* Ignore unpritable entry types. */
1016 static int aa_sfs_seq_open(struct inode
*inode
, struct file
*file
)
1018 return single_open(file
, aa_sfs_seq_show
, inode
->i_private
);
1021 const struct file_operations aa_sfs_seq_file_ops
= {
1022 .owner
= THIS_MODULE
,
1023 .open
= aa_sfs_seq_open
,
1025 .llseek
= seq_lseek
,
1026 .release
= single_release
,
1030 * profile based file operations
1031 * policy/profiles/XXXX/profiles/ *
1034 #define SEQ_PROFILE_FOPS(NAME) \
1035 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1037 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1040 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1041 .owner = THIS_MODULE, \
1042 .open = seq_profile_ ##NAME ##_open, \
1044 .llseek = seq_lseek, \
1045 .release = seq_profile_release, \
1048 static int seq_profile_open(struct inode *inode, struct file *file,
1049 int (*show
)(struct seq_file
*, void *))
1051 struct aa_proxy
*proxy
= aa_get_proxy(inode
->i_private
);
1052 int error
= single_open(file
, show
, proxy
);
1055 file
->private_data
= NULL
;
1056 aa_put_proxy(proxy
);
1062 static int seq_profile_release(struct inode
*inode
, struct file
*file
)
1064 struct seq_file
*seq
= (struct seq_file
*) file
->private_data
;
1066 aa_put_proxy(seq
->private);
1067 return single_release(inode
, file
);
1070 static int seq_profile_name_show(struct seq_file
*seq
, void *v
)
1072 struct aa_proxy
*proxy
= seq
->private;
1073 struct aa_label
*label
= aa_get_label_rcu(&proxy
->label
);
1074 struct aa_profile
*profile
= labels_profile(label
);
1075 seq_printf(seq
, "%s\n", profile
->base
.name
);
1076 aa_put_label(label
);
1081 static int seq_profile_mode_show(struct seq_file
*seq
, void *v
)
1083 struct aa_proxy
*proxy
= seq
->private;
1084 struct aa_label
*label
= aa_get_label_rcu(&proxy
->label
);
1085 struct aa_profile
*profile
= labels_profile(label
);
1086 seq_printf(seq
, "%s\n", aa_profile_mode_names
[profile
->mode
]);
1087 aa_put_label(label
);
1092 static int seq_profile_attach_show(struct seq_file
*seq
, void *v
)
1094 struct aa_proxy
*proxy
= seq
->private;
1095 struct aa_label
*label
= aa_get_label_rcu(&proxy
->label
);
1096 struct aa_profile
*profile
= labels_profile(label
);
1097 if (profile
->attach
)
1098 seq_printf(seq
, "%s\n", profile
->attach
);
1099 else if (profile
->xmatch
)
1100 seq_puts(seq
, "<unknown>\n");
1102 seq_printf(seq
, "%s\n", profile
->base
.name
);
1103 aa_put_label(label
);
1108 static int seq_profile_hash_show(struct seq_file
*seq
, void *v
)
1110 struct aa_proxy
*proxy
= seq
->private;
1111 struct aa_label
*label
= aa_get_label_rcu(&proxy
->label
);
1112 struct aa_profile
*profile
= labels_profile(label
);
1113 unsigned int i
, size
= aa_hash_size();
1115 if (profile
->hash
) {
1116 for (i
= 0; i
< size
; i
++)
1117 seq_printf(seq
, "%.2x", profile
->hash
[i
]);
1118 seq_putc(seq
, '\n');
1120 aa_put_label(label
);
1125 SEQ_PROFILE_FOPS(name
);
1126 SEQ_PROFILE_FOPS(mode
);
1127 SEQ_PROFILE_FOPS(attach
);
1128 SEQ_PROFILE_FOPS(hash
);
1131 * namespace based files
1132 * several root files and
1136 #define SEQ_NS_FOPS(NAME) \
1137 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1139 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1142 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1143 .owner = THIS_MODULE, \
1144 .open = seq_ns_ ##NAME ##_open, \
1146 .llseek = seq_lseek, \
1147 .release = single_release, \
1150 static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1152 struct aa_label
*label
;
1154 label
= begin_current_label_crit_section();
1155 seq_printf(seq
, "%s\n", label
->size
> 1 ? "yes" : "no");
1156 end_current_label_crit_section(label
);
1161 static int seq_ns_nsstacked_show(struct seq_file
*seq
, void *v
)
1163 struct aa_label
*label
;
1164 struct aa_profile
*profile
;
1168 label
= begin_current_label_crit_section();
1170 if (label
->size
> 1) {
1171 label_for_each(it
, label
, profile
)
1172 if (profile
->ns
!= labels_ns(label
)) {
1178 seq_printf(seq
, "%s\n", count
> 1 ? "yes" : "no");
1179 end_current_label_crit_section(label
);
1184 static int seq_ns_level_show(struct seq_file
*seq
, void *v
)
1186 struct aa_label
*label
;
1188 label
= begin_current_label_crit_section();
1189 seq_printf(seq
, "%d\n", labels_ns(label
)->level
);
1190 end_current_label_crit_section(label
);
1195 static int seq_ns_name_show(struct seq_file
*seq
, void *v
)
1197 struct aa_label
*label
= begin_current_label_crit_section();
1198 seq_printf(seq
, "%s\n", labels_ns(label
)->base
.name
);
1199 end_current_label_crit_section(label
);
1204 SEQ_NS_FOPS(stacked
);
1205 SEQ_NS_FOPS(nsstacked
);
1210 /* policy/raw_data/ * file ops */
1212 #define SEQ_RAWDATA_FOPS(NAME) \
1213 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1215 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1218 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1219 .owner = THIS_MODULE, \
1220 .open = seq_rawdata_ ##NAME ##_open, \
1222 .llseek = seq_lseek, \
1223 .release = seq_rawdata_release, \
1226 static int seq_rawdata_open(struct inode *inode, struct file *file,
1227 int (*show
)(struct seq_file
*, void *))
1229 struct aa_loaddata
*data
= __aa_get_loaddata(inode
->i_private
);
1233 /* lost race this ent is being reaped */
1236 error
= single_open(file
, show
, data
);
1238 AA_BUG(file
->private_data
&&
1239 ((struct seq_file
*)file
->private_data
)->private);
1240 aa_put_loaddata(data
);
1246 static int seq_rawdata_release(struct inode
*inode
, struct file
*file
)
1248 struct seq_file
*seq
= (struct seq_file
*) file
->private_data
;
1251 aa_put_loaddata(seq
->private);
1253 return single_release(inode
, file
);
1256 static int seq_rawdata_abi_show(struct seq_file
*seq
, void *v
)
1258 struct aa_loaddata
*data
= seq
->private;
1260 seq_printf(seq
, "v%d\n", data
->abi
);
1265 static int seq_rawdata_revision_show(struct seq_file
*seq
, void *v
)
1267 struct aa_loaddata
*data
= seq
->private;
1269 seq_printf(seq
, "%ld\n", data
->revision
);
1274 static int seq_rawdata_hash_show(struct seq_file
*seq
, void *v
)
1276 struct aa_loaddata
*data
= seq
->private;
1277 unsigned int i
, size
= aa_hash_size();
1280 for (i
= 0; i
< size
; i
++)
1281 seq_printf(seq
, "%.2x", data
->hash
[i
]);
1282 seq_putc(seq
, '\n');
1288 SEQ_RAWDATA_FOPS(abi
);
1289 SEQ_RAWDATA_FOPS(revision
);
1290 SEQ_RAWDATA_FOPS(hash
);
1292 static ssize_t
rawdata_read(struct file
*file
, char __user
*buf
, size_t size
,
1295 struct aa_loaddata
*rawdata
= file
->private_data
;
1297 return simple_read_from_buffer(buf
, size
, ppos
, rawdata
->data
,
1301 static int rawdata_release(struct inode
*inode
, struct file
*file
)
1303 aa_put_loaddata(file
->private_data
);
1308 static int rawdata_open(struct inode
*inode
, struct file
*file
)
1310 if (!policy_view_capable(NULL
))
1312 file
->private_data
= __aa_get_loaddata(inode
->i_private
);
1313 if (!file
->private_data
)
1314 /* lost race: this entry is being reaped */
1320 static const struct file_operations rawdata_fops
= {
1321 .open
= rawdata_open
,
1322 .read
= rawdata_read
,
1323 .llseek
= generic_file_llseek
,
1324 .release
= rawdata_release
,
1327 static void remove_rawdata_dents(struct aa_loaddata
*rawdata
)
1331 for (i
= 0; i
< AAFS_LOADDATA_NDENTS
; i
++) {
1332 if (!IS_ERR_OR_NULL(rawdata
->dents
[i
])) {
1333 /* no refcounts on i_private */
1334 aafs_remove(rawdata
->dents
[i
]);
1335 rawdata
->dents
[i
] = NULL
;
1340 void __aa_fs_remove_rawdata(struct aa_loaddata
*rawdata
)
1342 AA_BUG(rawdata
->ns
&& !mutex_is_locked(&rawdata
->ns
->lock
));
1345 remove_rawdata_dents(rawdata
);
1346 list_del_init(&rawdata
->list
);
1347 aa_put_ns(rawdata
->ns
);
1352 int __aa_fs_create_rawdata(struct aa_ns
*ns
, struct aa_loaddata
*rawdata
)
1354 struct dentry
*dent
, *dir
;
1358 AA_BUG(!mutex_is_locked(&ns
->lock
));
1359 AA_BUG(!ns_subdata_dir(ns
));
1362 * just use ns revision dir was originally created at. This is
1363 * under ns->lock and if load is successful revision will be
1364 * bumped and is guaranteed to be unique
1366 rawdata
->name
= kasprintf(GFP_KERNEL
, "%ld", ns
->revision
);
1370 dir
= aafs_create_dir(rawdata
->name
, ns_subdata_dir(ns
));
1372 /* ->name freed when rawdata freed */
1373 return PTR_ERR(dir
);
1374 rawdata
->dents
[AAFS_LOADDATA_DIR
] = dir
;
1376 dent
= aafs_create_file("abi", S_IFREG
| 0444, dir
, rawdata
,
1377 &seq_rawdata_abi_fops
);
1380 rawdata
->dents
[AAFS_LOADDATA_ABI
] = dent
;
1382 dent
= aafs_create_file("revision", S_IFREG
| 0444, dir
, rawdata
,
1383 &seq_rawdata_revision_fops
);
1386 rawdata
->dents
[AAFS_LOADDATA_REVISION
] = dent
;
1388 if (aa_g_hash_policy
) {
1389 dent
= aafs_create_file("sha1", S_IFREG
| 0444, dir
,
1390 rawdata
, &seq_rawdata_hash_fops
);
1393 rawdata
->dents
[AAFS_LOADDATA_HASH
] = dent
;
1396 dent
= aafs_create_file("raw_data", S_IFREG
| 0444,
1397 dir
, rawdata
, &rawdata_fops
);
1400 rawdata
->dents
[AAFS_LOADDATA_DATA
] = dent
;
1401 d_inode(dent
)->i_size
= rawdata
->size
;
1403 rawdata
->ns
= aa_get_ns(ns
);
1404 list_add(&rawdata
->list
, &ns
->rawdata_list
);
1405 /* no refcount on inode rawdata */
1410 remove_rawdata_dents(rawdata
);
1412 return PTR_ERR(dent
);
1415 /** fns to setup dynamic per profile/namespace files **/
1419 * Requires: @profile->ns->lock held
1421 void __aafs_profile_rmdir(struct aa_profile
*profile
)
1423 struct aa_profile
*child
;
1429 list_for_each_entry(child
, &profile
->base
.profiles
, base
.list
)
1430 __aafs_profile_rmdir(child
);
1432 for (i
= AAFS_PROF_SIZEOF
- 1; i
>= 0; --i
) {
1433 struct aa_proxy
*proxy
;
1434 if (!profile
->dents
[i
])
1437 proxy
= d_inode(profile
->dents
[i
])->i_private
;
1438 aafs_remove(profile
->dents
[i
]);
1439 aa_put_proxy(proxy
);
1440 profile
->dents
[i
] = NULL
;
1446 * Requires: @old->ns->lock held
1448 void __aafs_profile_migrate_dents(struct aa_profile
*old
,
1449 struct aa_profile
*new)
1455 AA_BUG(!mutex_is_locked(&profiles_ns(old
)->lock
));
1457 for (i
= 0; i
< AAFS_PROF_SIZEOF
; i
++) {
1458 new->dents
[i
] = old
->dents
[i
];
1460 new->dents
[i
]->d_inode
->i_mtime
= current_time(new->dents
[i
]->d_inode
);
1461 old
->dents
[i
] = NULL
;
1465 static struct dentry
*create_profile_file(struct dentry
*dir
, const char *name
,
1466 struct aa_profile
*profile
,
1467 const struct file_operations
*fops
)
1469 struct aa_proxy
*proxy
= aa_get_proxy(profile
->label
.proxy
);
1470 struct dentry
*dent
;
1472 dent
= aafs_create_file(name
, S_IFREG
| 0444, dir
, proxy
, fops
);
1474 aa_put_proxy(proxy
);
1479 static int profile_depth(struct aa_profile
*profile
)
1484 for (depth
= 0; profile
; profile
= rcu_access_pointer(profile
->parent
))
1491 static char *gen_symlink_name(int depth
, const char *dirname
, const char *fname
)
1495 int size
= depth
* 6 + strlen(dirname
) + strlen(fname
) + 11;
1497 s
= buffer
= kmalloc(size
, GFP_KERNEL
);
1499 return ERR_PTR(-ENOMEM
);
1501 for (; depth
> 0; depth
--) {
1502 strcpy(s
, "../../");
1507 error
= snprintf(s
, size
, "raw_data/%s/%s", dirname
, fname
);
1508 if (error
>= size
|| error
< 0) {
1510 return ERR_PTR(-ENAMETOOLONG
);
1516 static void rawdata_link_cb(void *arg
)
1521 static const char *rawdata_get_link_base(struct dentry
*dentry
,
1522 struct inode
*inode
,
1523 struct delayed_call
*done
,
1526 struct aa_proxy
*proxy
= inode
->i_private
;
1527 struct aa_label
*label
;
1528 struct aa_profile
*profile
;
1533 return ERR_PTR(-ECHILD
);
1535 label
= aa_get_label_rcu(&proxy
->label
);
1536 profile
= labels_profile(label
);
1537 depth
= profile_depth(profile
);
1538 target
= gen_symlink_name(depth
, profile
->rawdata
->name
, name
);
1539 aa_put_label(label
);
1544 set_delayed_call(done
, rawdata_link_cb
, target
);
1549 static const char *rawdata_get_link_sha1(struct dentry
*dentry
,
1550 struct inode
*inode
,
1551 struct delayed_call
*done
)
1553 return rawdata_get_link_base(dentry
, inode
, done
, "sha1");
1556 static const char *rawdata_get_link_abi(struct dentry
*dentry
,
1557 struct inode
*inode
,
1558 struct delayed_call
*done
)
1560 return rawdata_get_link_base(dentry
, inode
, done
, "abi");
1563 static const char *rawdata_get_link_data(struct dentry
*dentry
,
1564 struct inode
*inode
,
1565 struct delayed_call
*done
)
1567 return rawdata_get_link_base(dentry
, inode
, done
, "raw_data");
1570 static const struct inode_operations rawdata_link_sha1_iops
= {
1571 .get_link
= rawdata_get_link_sha1
,
1574 static const struct inode_operations rawdata_link_abi_iops
= {
1575 .get_link
= rawdata_get_link_abi
,
1577 static const struct inode_operations rawdata_link_data_iops
= {
1578 .get_link
= rawdata_get_link_data
,
1583 * Requires: @profile->ns->lock held
1585 int __aafs_profile_mkdir(struct aa_profile
*profile
, struct dentry
*parent
)
1587 struct aa_profile
*child
;
1588 struct dentry
*dent
= NULL
, *dir
;
1592 AA_BUG(!mutex_is_locked(&profiles_ns(profile
)->lock
));
1595 struct aa_profile
*p
;
1596 p
= aa_deref_parent(profile
);
1598 /* adding to parent that previously didn't have children */
1599 dent
= aafs_create_dir("profiles", dent
);
1602 prof_child_dir(p
) = parent
= dent
;
1605 if (!profile
->dirname
) {
1607 len
= mangle_name(profile
->base
.name
, NULL
);
1608 id_len
= snprintf(NULL
, 0, ".%ld", profile
->ns
->uniq_id
);
1610 profile
->dirname
= kmalloc(len
+ id_len
+ 1, GFP_KERNEL
);
1611 if (!profile
->dirname
) {
1616 mangle_name(profile
->base
.name
, profile
->dirname
);
1617 sprintf(profile
->dirname
+ len
, ".%ld", profile
->ns
->uniq_id
++);
1620 dent
= aafs_create_dir(profile
->dirname
, parent
);
1623 prof_dir(profile
) = dir
= dent
;
1625 dent
= create_profile_file(dir
, "name", profile
,
1626 &seq_profile_name_fops
);
1629 profile
->dents
[AAFS_PROF_NAME
] = dent
;
1631 dent
= create_profile_file(dir
, "mode", profile
,
1632 &seq_profile_mode_fops
);
1635 profile
->dents
[AAFS_PROF_MODE
] = dent
;
1637 dent
= create_profile_file(dir
, "attach", profile
,
1638 &seq_profile_attach_fops
);
1641 profile
->dents
[AAFS_PROF_ATTACH
] = dent
;
1643 if (profile
->hash
) {
1644 dent
= create_profile_file(dir
, "sha1", profile
,
1645 &seq_profile_hash_fops
);
1648 profile
->dents
[AAFS_PROF_HASH
] = dent
;
1651 if (profile
->rawdata
) {
1652 dent
= aafs_create_symlink("raw_sha1", dir
, NULL
,
1653 profile
->label
.proxy
,
1654 &rawdata_link_sha1_iops
);
1657 aa_get_proxy(profile
->label
.proxy
);
1658 profile
->dents
[AAFS_PROF_RAW_HASH
] = dent
;
1660 dent
= aafs_create_symlink("raw_abi", dir
, NULL
,
1661 profile
->label
.proxy
,
1662 &rawdata_link_abi_iops
);
1665 aa_get_proxy(profile
->label
.proxy
);
1666 profile
->dents
[AAFS_PROF_RAW_ABI
] = dent
;
1668 dent
= aafs_create_symlink("raw_data", dir
, NULL
,
1669 profile
->label
.proxy
,
1670 &rawdata_link_data_iops
);
1673 aa_get_proxy(profile
->label
.proxy
);
1674 profile
->dents
[AAFS_PROF_RAW_DATA
] = dent
;
1677 list_for_each_entry(child
, &profile
->base
.profiles
, base
.list
) {
1678 error
= __aafs_profile_mkdir(child
, prof_child_dir(profile
));
1686 error
= PTR_ERR(dent
);
1689 __aafs_profile_rmdir(profile
);
1694 static int ns_mkdir_op(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
1696 struct aa_ns
*ns
, *parent
;
1697 /* TODO: improve permission check */
1698 struct aa_label
*label
;
1701 label
= begin_current_label_crit_section();
1702 error
= aa_may_manage_policy(label
, NULL
, AA_MAY_LOAD_POLICY
);
1703 end_current_label_crit_section(label
);
1707 parent
= aa_get_ns(dir
->i_private
);
1708 AA_BUG(d_inode(ns_subns_dir(parent
)) != dir
);
1710 /* we have to unlock and then relock to get locking order right
1714 error
= simple_pin_fs(&aafs_ops
, &aafs_mnt
, &aafs_count
);
1715 mutex_lock_nested(&parent
->lock
, parent
->level
);
1716 inode_lock_nested(dir
, I_MUTEX_PARENT
);
1720 error
= __aafs_setup_d_inode(dir
, dentry
, mode
| S_IFDIR
, NULL
,
1725 ns
= __aa_find_or_create_ns(parent
, READ_ONCE(dentry
->d_name
.name
),
1728 error
= PTR_ERR(ns
);
1732 aa_put_ns(ns
); /* list ref remains */
1735 simple_release_fs(&aafs_mnt
, &aafs_count
);
1737 mutex_unlock(&parent
->lock
);
1743 static int ns_rmdir_op(struct inode
*dir
, struct dentry
*dentry
)
1745 struct aa_ns
*ns
, *parent
;
1746 /* TODO: improve permission check */
1747 struct aa_label
*label
;
1750 label
= begin_current_label_crit_section();
1751 error
= aa_may_manage_policy(label
, NULL
, AA_MAY_LOAD_POLICY
);
1752 end_current_label_crit_section(label
);
1756 parent
= aa_get_ns(dir
->i_private
);
1757 /* rmdir calls the generic securityfs functions to remove files
1758 * from the apparmor dir. It is up to the apparmor ns locking
1762 inode_unlock(dentry
->d_inode
);
1764 mutex_lock_nested(&parent
->lock
, parent
->level
);
1765 ns
= aa_get_ns(__aa_findn_ns(&parent
->sub_ns
, dentry
->d_name
.name
,
1766 dentry
->d_name
.len
));
1771 AA_BUG(ns_dir(ns
) != dentry
);
1777 mutex_unlock(&parent
->lock
);
1778 inode_lock_nested(dir
, I_MUTEX_PARENT
);
1779 inode_lock(dentry
->d_inode
);
1785 static const struct inode_operations ns_dir_inode_operations
= {
1786 .lookup
= simple_lookup
,
1787 .mkdir
= ns_mkdir_op
,
1788 .rmdir
= ns_rmdir_op
,
1791 static void __aa_fs_list_remove_rawdata(struct aa_ns
*ns
)
1793 struct aa_loaddata
*ent
, *tmp
;
1795 AA_BUG(!mutex_is_locked(&ns
->lock
));
1797 list_for_each_entry_safe(ent
, tmp
, &ns
->rawdata_list
, list
)
1798 __aa_fs_remove_rawdata(ent
);
1803 * Requires: @ns->lock held
1805 void __aafs_ns_rmdir(struct aa_ns
*ns
)
1808 struct aa_profile
*child
;
1813 AA_BUG(!mutex_is_locked(&ns
->lock
));
1815 list_for_each_entry(child
, &ns
->base
.profiles
, base
.list
)
1816 __aafs_profile_rmdir(child
);
1818 list_for_each_entry(sub
, &ns
->sub_ns
, base
.list
) {
1819 mutex_lock_nested(&sub
->lock
, sub
->level
);
1820 __aafs_ns_rmdir(sub
);
1821 mutex_unlock(&sub
->lock
);
1824 __aa_fs_list_remove_rawdata(ns
);
1826 if (ns_subns_dir(ns
)) {
1827 sub
= d_inode(ns_subns_dir(ns
))->i_private
;
1830 if (ns_subload(ns
)) {
1831 sub
= d_inode(ns_subload(ns
))->i_private
;
1834 if (ns_subreplace(ns
)) {
1835 sub
= d_inode(ns_subreplace(ns
))->i_private
;
1838 if (ns_subremove(ns
)) {
1839 sub
= d_inode(ns_subremove(ns
))->i_private
;
1842 if (ns_subrevision(ns
)) {
1843 sub
= d_inode(ns_subrevision(ns
))->i_private
;
1847 for (i
= AAFS_NS_SIZEOF
- 1; i
>= 0; --i
) {
1848 aafs_remove(ns
->dents
[i
]);
1849 ns
->dents
[i
] = NULL
;
1853 /* assumes cleanup in caller */
1854 static int __aafs_ns_mkdir_entries(struct aa_ns
*ns
, struct dentry
*dir
)
1856 struct dentry
*dent
;
1861 dent
= aafs_create_dir("profiles", dir
);
1863 return PTR_ERR(dent
);
1864 ns_subprofs_dir(ns
) = dent
;
1866 dent
= aafs_create_dir("raw_data", dir
);
1868 return PTR_ERR(dent
);
1869 ns_subdata_dir(ns
) = dent
;
1871 dent
= aafs_create_file("revision", 0444, dir
, ns
,
1872 &aa_fs_ns_revision_fops
);
1874 return PTR_ERR(dent
);
1876 ns_subrevision(ns
) = dent
;
1878 dent
= aafs_create_file(".load", 0640, dir
, ns
,
1879 &aa_fs_profile_load
);
1881 return PTR_ERR(dent
);
1883 ns_subload(ns
) = dent
;
1885 dent
= aafs_create_file(".replace", 0640, dir
, ns
,
1886 &aa_fs_profile_replace
);
1888 return PTR_ERR(dent
);
1890 ns_subreplace(ns
) = dent
;
1892 dent
= aafs_create_file(".remove", 0640, dir
, ns
,
1893 &aa_fs_profile_remove
);
1895 return PTR_ERR(dent
);
1897 ns_subremove(ns
) = dent
;
1899 /* use create_dentry so we can supply private data */
1900 dent
= aafs_create("namespaces", S_IFDIR
| 0755, dir
, ns
, NULL
, NULL
,
1901 &ns_dir_inode_operations
);
1903 return PTR_ERR(dent
);
1905 ns_subns_dir(ns
) = dent
;
1911 * Requires: @ns->lock held
1913 int __aafs_ns_mkdir(struct aa_ns
*ns
, struct dentry
*parent
, const char *name
,
1914 struct dentry
*dent
)
1917 struct aa_profile
*child
;
1923 AA_BUG(!mutex_is_locked(&ns
->lock
));
1926 name
= ns
->base
.name
;
1929 /* create ns dir if it doesn't already exist */
1930 dent
= aafs_create_dir(name
, parent
);
1935 ns_dir(ns
) = dir
= dent
;
1936 error
= __aafs_ns_mkdir_entries(ns
, dir
);
1941 list_for_each_entry(child
, &ns
->base
.profiles
, base
.list
) {
1942 error
= __aafs_profile_mkdir(child
, ns_subprofs_dir(ns
));
1948 list_for_each_entry(sub
, &ns
->sub_ns
, base
.list
) {
1949 mutex_lock_nested(&sub
->lock
, sub
->level
);
1950 error
= __aafs_ns_mkdir(sub
, ns_subns_dir(ns
), NULL
, NULL
);
1951 mutex_unlock(&sub
->lock
);
1959 error
= PTR_ERR(dent
);
1962 __aafs_ns_rmdir(ns
);
1968 #define list_entry_is_head(pos, head, member) (&pos->member == (head))
1971 * __next_ns - find the next namespace to list
1972 * @root: root namespace to stop search at (NOT NULL)
1973 * @ns: current ns position (NOT NULL)
1975 * Find the next namespace from @ns under @root and handle all locking needed
1976 * while switching current namespace.
1978 * Returns: next namespace or NULL if at last namespace under @root
1979 * Requires: ns->parent->lock to be held
1980 * NOTE: will not unlock root->lock
1982 static struct aa_ns
*__next_ns(struct aa_ns
*root
, struct aa_ns
*ns
)
1984 struct aa_ns
*parent
, *next
;
1988 AA_BUG(ns
!= root
&& !mutex_is_locked(&ns
->parent
->lock
));
1990 /* is next namespace a child */
1991 if (!list_empty(&ns
->sub_ns
)) {
1992 next
= list_first_entry(&ns
->sub_ns
, typeof(*ns
), base
.list
);
1993 mutex_lock_nested(&next
->lock
, next
->level
);
1997 /* check if the next ns is a sibling, parent, gp, .. */
1998 parent
= ns
->parent
;
1999 while (ns
!= root
) {
2000 mutex_unlock(&ns
->lock
);
2001 next
= list_next_entry(ns
, base
.list
);
2002 if (!list_entry_is_head(next
, &parent
->sub_ns
, base
.list
)) {
2003 mutex_lock_nested(&next
->lock
, next
->level
);
2007 parent
= parent
->parent
;
2014 * __first_profile - find the first profile in a namespace
2015 * @root: namespace that is root of profiles being displayed (NOT NULL)
2016 * @ns: namespace to start in (NOT NULL)
2018 * Returns: unrefcounted profile or NULL if no profile
2019 * Requires: profile->ns.lock to be held
2021 static struct aa_profile
*__first_profile(struct aa_ns
*root
,
2025 AA_BUG(ns
&& !mutex_is_locked(&ns
->lock
));
2027 for (; ns
; ns
= __next_ns(root
, ns
)) {
2028 if (!list_empty(&ns
->base
.profiles
))
2029 return list_first_entry(&ns
->base
.profiles
,
2030 struct aa_profile
, base
.list
);
2036 * __next_profile - step to the next profile in a profile tree
2037 * @profile: current profile in tree (NOT NULL)
2039 * Perform a depth first traversal on the profile tree in a namespace
2041 * Returns: next profile or NULL if done
2042 * Requires: profile->ns.lock to be held
2044 static struct aa_profile
*__next_profile(struct aa_profile
*p
)
2046 struct aa_profile
*parent
;
2047 struct aa_ns
*ns
= p
->ns
;
2049 AA_BUG(!mutex_is_locked(&profiles_ns(p
)->lock
));
2051 /* is next profile a child */
2052 if (!list_empty(&p
->base
.profiles
))
2053 return list_first_entry(&p
->base
.profiles
, typeof(*p
),
2056 /* is next profile a sibling, parent sibling, gp, sibling, .. */
2057 parent
= rcu_dereference_protected(p
->parent
,
2058 mutex_is_locked(&p
->ns
->lock
));
2060 p
= list_next_entry(p
, base
.list
);
2061 if (!list_entry_is_head(p
, &parent
->base
.profiles
, base
.list
))
2064 parent
= rcu_dereference_protected(parent
->parent
,
2065 mutex_is_locked(&parent
->ns
->lock
));
2068 /* is next another profile in the namespace */
2069 p
= list_next_entry(p
, base
.list
);
2070 if (!list_entry_is_head(p
, &ns
->base
.profiles
, base
.list
))
2077 * next_profile - step to the next profile in where ever it may be
2078 * @root: root namespace (NOT NULL)
2079 * @profile: current profile (NOT NULL)
2081 * Returns: next profile or NULL if there isn't one
2083 static struct aa_profile
*next_profile(struct aa_ns
*root
,
2084 struct aa_profile
*profile
)
2086 struct aa_profile
*next
= __next_profile(profile
);
2090 /* finished all profiles in namespace move to next namespace */
2091 return __first_profile(root
, __next_ns(root
, profile
->ns
));
2095 * p_start - start a depth first traversal of profile tree
2096 * @f: seq_file to fill
2097 * @pos: current position
2099 * Returns: first profile under current namespace or NULL if none found
2101 * acquires first ns->lock
2103 static void *p_start(struct seq_file
*f
, loff_t
*pos
)
2105 struct aa_profile
*profile
= NULL
;
2106 struct aa_ns
*root
= aa_get_current_ns();
2110 /* find the first profile */
2111 mutex_lock_nested(&root
->lock
, root
->level
);
2112 profile
= __first_profile(root
, root
);
2114 /* skip to position */
2115 for (; profile
&& l
> 0; l
--)
2116 profile
= next_profile(root
, profile
);
2122 * p_next - read the next profile entry
2123 * @f: seq_file to fill
2124 * @p: profile previously returned
2125 * @pos: current position
2127 * Returns: next profile after @p or NULL if none
2129 * may acquire/release locks in namespace tree as necessary
2131 static void *p_next(struct seq_file
*f
, void *p
, loff_t
*pos
)
2133 struct aa_profile
*profile
= p
;
2134 struct aa_ns
*ns
= f
->private;
2137 return next_profile(ns
, profile
);
2141 * p_stop - stop depth first traversal
2142 * @f: seq_file we are filling
2143 * @p: the last profile writen
2145 * Release all locking done by p_start/p_next on namespace tree
2147 static void p_stop(struct seq_file
*f
, void *p
)
2149 struct aa_profile
*profile
= p
;
2150 struct aa_ns
*root
= f
->private, *ns
;
2153 for (ns
= profile
->ns
; ns
&& ns
!= root
; ns
= ns
->parent
)
2154 mutex_unlock(&ns
->lock
);
2156 mutex_unlock(&root
->lock
);
2161 * seq_show_profile - show a profile entry
2162 * @f: seq_file to file
2163 * @p: current position (profile) (NOT NULL)
2165 * Returns: error on failure
2167 static int seq_show_profile(struct seq_file
*f
, void *p
)
2169 struct aa_profile
*profile
= (struct aa_profile
*)p
;
2170 struct aa_ns
*root
= f
->private;
2172 aa_label_seq_xprint(f
, root
, &profile
->label
,
2173 FLAG_SHOW_MODE
| FLAG_VIEW_SUBNS
, GFP_KERNEL
);
2179 static const struct seq_operations aa_sfs_profiles_op
= {
2183 .show
= seq_show_profile
,
2186 static int profiles_open(struct inode
*inode
, struct file
*file
)
2188 if (!policy_view_capable(NULL
))
2191 return seq_open(file
, &aa_sfs_profiles_op
);
2194 static int profiles_release(struct inode
*inode
, struct file
*file
)
2196 return seq_release(inode
, file
);
2199 static const struct file_operations aa_sfs_profiles_fops
= {
2200 .open
= profiles_open
,
2202 .llseek
= seq_lseek
,
2203 .release
= profiles_release
,
2207 /** Base file system setup **/
2208 static struct aa_sfs_entry aa_sfs_entry_file
[] = {
2209 AA_SFS_FILE_STRING("mask",
2210 "create read write exec append mmap_exec link lock"),
2214 static struct aa_sfs_entry aa_sfs_entry_ptrace
[] = {
2215 AA_SFS_FILE_STRING("mask", "read trace"),
2219 static struct aa_sfs_entry aa_sfs_entry_signal
[] = {
2220 AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK
),
2224 static struct aa_sfs_entry aa_sfs_entry_domain
[] = {
2225 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2226 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2227 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2228 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2229 AA_SFS_FILE_BOOLEAN("stack", 1),
2230 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2231 AA_SFS_FILE_STRING("version", "1.2"),
2235 static struct aa_sfs_entry aa_sfs_entry_versions
[] = {
2236 AA_SFS_FILE_BOOLEAN("v5", 1),
2237 AA_SFS_FILE_BOOLEAN("v6", 1),
2238 AA_SFS_FILE_BOOLEAN("v7", 1),
2242 static struct aa_sfs_entry aa_sfs_entry_policy
[] = {
2243 AA_SFS_DIR("versions", aa_sfs_entry_versions
),
2244 AA_SFS_FILE_BOOLEAN("set_load", 1),
2248 static struct aa_sfs_entry aa_sfs_entry_mount
[] = {
2249 AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
2253 static struct aa_sfs_entry aa_sfs_entry_ns
[] = {
2254 AA_SFS_FILE_BOOLEAN("profile", 1),
2255 AA_SFS_FILE_BOOLEAN("pivot_root", 0),
2259 static struct aa_sfs_entry aa_sfs_entry_dbus
[] = {
2260 AA_SFS_FILE_STRING("mask", "acquire send receive"),
2264 static struct aa_sfs_entry aa_sfs_entry_query_label
[] = {
2265 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2266 AA_SFS_FILE_BOOLEAN("data", 1),
2267 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2271 static struct aa_sfs_entry aa_sfs_entry_query
[] = {
2272 AA_SFS_DIR("label", aa_sfs_entry_query_label
),
2275 static struct aa_sfs_entry aa_sfs_entry_features
[] = {
2276 AA_SFS_DIR("policy", aa_sfs_entry_policy
),
2277 AA_SFS_DIR("domain", aa_sfs_entry_domain
),
2278 AA_SFS_DIR("file", aa_sfs_entry_file
),
2279 AA_SFS_DIR("network", aa_sfs_entry_network
),
2280 AA_SFS_DIR("mount", aa_sfs_entry_mount
),
2281 AA_SFS_DIR("namespaces", aa_sfs_entry_ns
),
2282 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK
),
2283 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit
),
2284 AA_SFS_DIR("caps", aa_sfs_entry_caps
),
2285 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace
),
2286 AA_SFS_DIR("signal", aa_sfs_entry_signal
),
2287 AA_SFS_DIR("dbus", aa_sfs_entry_dbus
),
2288 AA_SFS_DIR("query", aa_sfs_entry_query
),
2292 static struct aa_sfs_entry aa_sfs_entry_apparmor
[] = {
2293 AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access
),
2294 AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops
),
2295 AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops
),
2296 AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops
),
2297 AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops
),
2298 AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops
),
2299 AA_SFS_DIR("features", aa_sfs_entry_features
),
2303 static struct aa_sfs_entry aa_sfs_entry
=
2304 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor
);
2307 * entry_create_file - create a file entry in the apparmor securityfs
2308 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2309 * @parent: the parent dentry in the securityfs
2311 * Use entry_remove_file to remove entries created with this fn.
2313 static int __init
entry_create_file(struct aa_sfs_entry
*fs_file
,
2314 struct dentry
*parent
)
2318 fs_file
->dentry
= securityfs_create_file(fs_file
->name
,
2319 S_IFREG
| fs_file
->mode
,
2322 if (IS_ERR(fs_file
->dentry
)) {
2323 error
= PTR_ERR(fs_file
->dentry
);
2324 fs_file
->dentry
= NULL
;
2329 static void __init
entry_remove_dir(struct aa_sfs_entry
*fs_dir
);
2331 * entry_create_dir - recursively create a directory entry in the securityfs
2332 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2333 * @parent: the parent dentry in the securityfs
2335 * Use entry_remove_dir to remove entries created with this fn.
2337 static int __init
entry_create_dir(struct aa_sfs_entry
*fs_dir
,
2338 struct dentry
*parent
)
2340 struct aa_sfs_entry
*fs_file
;
2344 dir
= securityfs_create_dir(fs_dir
->name
, parent
);
2346 return PTR_ERR(dir
);
2347 fs_dir
->dentry
= dir
;
2349 for (fs_file
= fs_dir
->v
.files
; fs_file
&& fs_file
->name
; ++fs_file
) {
2350 if (fs_file
->v_type
== AA_SFS_TYPE_DIR
)
2351 error
= entry_create_dir(fs_file
, fs_dir
->dentry
);
2353 error
= entry_create_file(fs_file
, fs_dir
->dentry
);
2361 entry_remove_dir(fs_dir
);
2367 * entry_remove_file - drop a single file entry in the apparmor securityfs
2368 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2370 static void __init
entry_remove_file(struct aa_sfs_entry
*fs_file
)
2372 if (!fs_file
->dentry
)
2375 securityfs_remove(fs_file
->dentry
);
2376 fs_file
->dentry
= NULL
;
2380 * entry_remove_dir - recursively drop a directory entry from the securityfs
2381 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2383 static void __init
entry_remove_dir(struct aa_sfs_entry
*fs_dir
)
2385 struct aa_sfs_entry
*fs_file
;
2387 for (fs_file
= fs_dir
->v
.files
; fs_file
&& fs_file
->name
; ++fs_file
) {
2388 if (fs_file
->v_type
== AA_SFS_TYPE_DIR
)
2389 entry_remove_dir(fs_file
);
2391 entry_remove_file(fs_file
);
2394 entry_remove_file(fs_dir
);
2398 * aa_destroy_aafs - cleanup and free aafs
2400 * releases dentries allocated by aa_create_aafs
2402 void __init
aa_destroy_aafs(void)
2404 entry_remove_dir(&aa_sfs_entry
);
2408 #define NULL_FILE_NAME ".null"
2409 struct path aa_null
;
2411 static int aa_mk_null_file(struct dentry
*parent
)
2413 struct vfsmount
*mount
= NULL
;
2414 struct dentry
*dentry
;
2415 struct inode
*inode
;
2417 int error
= simple_pin_fs(parent
->d_sb
->s_type
, &mount
, &count
);
2422 inode_lock(d_inode(parent
));
2423 dentry
= lookup_one_len(NULL_FILE_NAME
, parent
, strlen(NULL_FILE_NAME
));
2424 if (IS_ERR(dentry
)) {
2425 error
= PTR_ERR(dentry
);
2428 inode
= new_inode(parent
->d_inode
->i_sb
);
2434 inode
->i_ino
= get_next_ino();
2435 inode
->i_mode
= S_IFCHR
| S_IRUGO
| S_IWUGO
;
2436 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= current_time(inode
);
2437 init_special_inode(inode
, S_IFCHR
| S_IRUGO
| S_IWUGO
,
2438 MKDEV(MEM_MAJOR
, 3));
2439 d_instantiate(dentry
, inode
);
2440 aa_null
.dentry
= dget(dentry
);
2441 aa_null
.mnt
= mntget(mount
);
2448 inode_unlock(d_inode(parent
));
2449 simple_release_fs(&mount
, &count
);
2455 static const char *policy_get_link(struct dentry
*dentry
,
2456 struct inode
*inode
,
2457 struct delayed_call
*done
)
2463 return ERR_PTR(-ECHILD
);
2464 ns
= aa_get_current_ns();
2465 path
.mnt
= mntget(aafs_mnt
);
2466 path
.dentry
= dget(ns_dir(ns
));
2467 nd_jump_link(&path
);
2473 static int ns_get_name(char *buf
, size_t size
, struct aa_ns
*ns
,
2474 struct inode
*inode
)
2476 int res
= snprintf(buf
, size
, "%s:[%lu]", AAFS_NAME
, inode
->i_ino
);
2478 if (res
< 0 || res
>= size
)
2484 static int policy_readlink(struct dentry
*dentry
, char __user
*buffer
,
2491 ns
= aa_get_current_ns();
2492 res
= ns_get_name(name
, sizeof(name
), ns
, d_inode(dentry
));
2494 res
= readlink_copy(buffer
, buflen
, name
);
2500 static const struct inode_operations policy_link_iops
= {
2501 .readlink
= policy_readlink
,
2502 .get_link
= policy_get_link
,
2507 * aa_create_aafs - create the apparmor security filesystem
2509 * dentries created here are released by aa_destroy_aafs
2511 * Returns: error on failure
2513 static int __init
aa_create_aafs(void)
2515 struct dentry
*dent
;
2518 if (!apparmor_initialized
)
2521 if (aa_sfs_entry
.dentry
) {
2522 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__
);
2526 /* setup apparmorfs used to virtualize policy/ */
2527 aafs_mnt
= kern_mount(&aafs_ops
);
2528 if (IS_ERR(aafs_mnt
))
2529 panic("can't set apparmorfs up\n");
2530 aafs_mnt
->mnt_sb
->s_flags
&= ~SB_NOUSER
;
2532 /* Populate fs tree. */
2533 error
= entry_create_dir(&aa_sfs_entry
, NULL
);
2537 dent
= securityfs_create_file(".load", 0666, aa_sfs_entry
.dentry
,
2538 NULL
, &aa_fs_profile_load
);
2540 error
= PTR_ERR(dent
);
2543 ns_subload(root_ns
) = dent
;
2545 dent
= securityfs_create_file(".replace", 0666, aa_sfs_entry
.dentry
,
2546 NULL
, &aa_fs_profile_replace
);
2548 error
= PTR_ERR(dent
);
2551 ns_subreplace(root_ns
) = dent
;
2553 dent
= securityfs_create_file(".remove", 0666, aa_sfs_entry
.dentry
,
2554 NULL
, &aa_fs_profile_remove
);
2556 error
= PTR_ERR(dent
);
2559 ns_subremove(root_ns
) = dent
;
2561 dent
= securityfs_create_file("revision", 0444, aa_sfs_entry
.dentry
,
2562 NULL
, &aa_fs_ns_revision_fops
);
2564 error
= PTR_ERR(dent
);
2567 ns_subrevision(root_ns
) = dent
;
2569 /* policy tree referenced by magic policy symlink */
2570 mutex_lock_nested(&root_ns
->lock
, root_ns
->level
);
2571 error
= __aafs_ns_mkdir(root_ns
, aafs_mnt
->mnt_root
, ".policy",
2572 aafs_mnt
->mnt_root
);
2573 mutex_unlock(&root_ns
->lock
);
2577 /* magic symlink similar to nsfs redirects based on task policy */
2578 dent
= securityfs_create_symlink("policy", aa_sfs_entry
.dentry
,
2579 NULL
, &policy_link_iops
);
2581 error
= PTR_ERR(dent
);
2585 error
= aa_mk_null_file(aa_sfs_entry
.dentry
);
2589 /* TODO: add default profile to apparmorfs */
2591 /* Report that AppArmor fs is enabled */
2592 aa_info_message("AppArmor Filesystem Enabled");
2597 AA_ERROR("Error creating AppArmor securityfs\n");
2601 fs_initcall(aa_create_aafs
);