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/policy_ns.h"
36 #include "include/policy.h"
37 #include "include/policy_ns.h"
38 #include "include/resource.h"
39 #include "include/policy_unpack.h"
42 * The apparmor filesystem interface used for policy load and introspection
43 * The interface is split into two main components based on their function
44 * a securityfs component:
45 * used for static files that are always available, and which allows
46 * userspace to specificy the location of the security filesystem.
48 * fns and data are prefixed with
51 * an apparmorfs component:
52 * used loaded policy content and introspection. It is not part of a
53 * regular mounted filesystem and is available only through the magic
54 * policy symlink in the root of the securityfs apparmor/ directory.
55 * Tasks queries will be magically redirected to the correct portion
56 * of the policy tree based on their confinement.
58 * fns and data are prefixed with
61 * The aa_fs_ prefix is used to indicate the fn is used by both the
62 * securityfs and apparmorfs filesystems.
71 * aa_mangle_name - mangle a profile name to std profile layout form
72 * @name: profile name to mangle (NOT NULL)
73 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
75 * Returns: length of mangled name
77 static int mangle_name(const char *name, char *target)
81 while (*name == '/' || *name == '.')
85 for (; *name; name++) {
88 else if (isspace(*name))
90 else if (isalnum(*name) || strchr("._-", *name))
97 for (; *name; name++) {
98 if (isalnum(*name) || isspace(*name) ||
99 strchr("/._-", *name))
111 * aafs - core fns and data for the policy tree
114 #define AAFS_NAME "apparmorfs"
115 static struct vfsmount *aafs_mnt;
116 static int aafs_count;
119 static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
121 struct inode *inode = d_inode(dentry);
123 seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino);
127 static void aafs_evict_inode(struct inode *inode)
129 truncate_inode_pages_final(&inode->i_data);
131 if (S_ISLNK(inode->i_mode))
132 kfree(inode->i_link);
135 static const struct super_operations aafs_super_ops = {
136 .statfs = simple_statfs,
137 .evict_inode = aafs_evict_inode,
138 .show_path = aafs_show_path,
141 static int fill_super(struct super_block *sb, void *data, int silent)
143 static struct tree_descr files[] = { {""} };
146 error = simple_fill_super(sb, AAFS_MAGIC, files);
149 sb->s_op = &aafs_super_ops;
154 static struct dentry *aafs_mount(struct file_system_type *fs_type,
155 int flags, const char *dev_name, void *data)
157 return mount_single(fs_type, flags, data, fill_super);
160 static struct file_system_type aafs_ops = {
161 .owner = THIS_MODULE,
164 .kill_sb = kill_anon_super,
168 * __aafs_setup_d_inode - basic inode setup for apparmorfs
169 * @dir: parent directory for the dentry
170 * @dentry: dentry we are seting the inode up for
171 * @mode: permissions the file should have
172 * @data: data to store on inode.i_private, available in open()
173 * @link: if symlink, symlink target string
174 * @fops: struct file_operations that should be used
175 * @iops: struct of inode_operations that should be used
177 static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
178 umode_t mode, void *data, char *link,
179 const struct file_operations *fops,
180 const struct inode_operations *iops)
182 struct inode *inode = new_inode(dir->i_sb);
190 inode->i_ino = get_next_ino();
191 inode->i_mode = mode;
192 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
193 inode->i_private = data;
195 inode->i_op = iops ? iops : &simple_dir_inode_operations;
196 inode->i_fop = &simple_dir_operations;
199 } else if (S_ISLNK(mode)) {
200 inode->i_op = iops ? iops : &simple_symlink_inode_operations;
201 inode->i_link = link;
205 d_instantiate(dentry, inode);
212 * aafs_create - create a dentry in the apparmorfs filesystem
214 * @name: name of dentry to create
215 * @mode: permissions the file should have
216 * @parent: parent directory for this dentry
217 * @data: data to store on inode.i_private, available in open()
218 * @link: if symlink, symlink target string
219 * @fops: struct file_operations that should be used for
220 * @iops: struct of inode_operations that should be used
222 * This is the basic "create a xxx" function for apparmorfs.
224 * Returns a pointer to a dentry if it succeeds, that must be free with
225 * aafs_remove(). Will return ERR_PTR on failure.
227 static struct dentry *aafs_create(const char *name, umode_t mode,
228 struct dentry *parent, void *data, void *link,
229 const struct file_operations *fops,
230 const struct inode_operations *iops)
232 struct dentry *dentry;
239 if (!(mode & S_IFMT))
240 mode = (mode & S_IALLUGO) | S_IFREG;
242 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
244 return ERR_PTR(error);
246 dir = d_inode(parent);
249 dentry = lookup_one_len(name, parent, strlen(name));
253 if (d_really_is_positive(dentry)) {
258 error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
270 simple_release_fs(&aafs_mnt, &aafs_count);
272 return ERR_PTR(error);
276 * aafs_create_file - create a file in the apparmorfs filesystem
278 * @name: name of dentry to create
279 * @mode: permissions the file should have
280 * @parent: parent directory for this dentry
281 * @data: data to store on inode.i_private, available in open()
282 * @fops: struct file_operations that should be used for
286 static struct dentry *aafs_create_file(const char *name, umode_t mode,
287 struct dentry *parent, void *data,
288 const struct file_operations *fops)
290 return aafs_create(name, mode, parent, data, NULL, fops, NULL);
294 * aafs_create_dir - create a directory in the apparmorfs filesystem
296 * @name: name of dentry to create
297 * @parent: parent directory for this dentry
301 static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
303 return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
308 * aafs_create_symlink - create a symlink in the apparmorfs filesystem
309 * @name: name of dentry to create
310 * @parent: parent directory for this dentry
311 * @target: if symlink, symlink target string
312 * @iops: struct of inode_operations that should be used
314 * If @target parameter is %NULL, then the @iops parameter needs to be
315 * setup to handle .readlink and .get_link inode_operations.
317 static struct dentry *aafs_create_symlink(const char *name,
318 struct dentry *parent,
320 const struct inode_operations *iops)
326 link = kstrdup(target, GFP_KERNEL);
328 return ERR_PTR(-ENOMEM);
330 dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL,
339 * aafs_remove - removes a file or directory from the apparmorfs filesystem
341 * @dentry: dentry of the file/directory/symlink to removed.
343 static void aafs_remove(struct dentry *dentry)
347 if (!dentry || IS_ERR(dentry))
350 dir = d_inode(dentry->d_parent);
352 if (simple_positive(dentry)) {
353 if (d_is_dir(dentry))
354 simple_rmdir(dir, dentry);
356 simple_unlink(dir, dentry);
360 simple_release_fs(&aafs_mnt, &aafs_count);
365 * aa_fs - policy load/replace/remove
369 * aa_simple_write_to_buffer - common routine for getting policy from user
370 * @userbuf: user buffer to copy data from (NOT NULL)
371 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
372 * @copy_size: size of data to copy from user buffer
373 * @pos: position write is at in the file (NOT NULL)
375 * Returns: kernel buffer containing copy of user buffer data or an
376 * ERR_PTR on failure.
378 static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
383 struct aa_loaddata *data;
385 AA_BUG(copy_size > alloc_size);
388 /* only writes from pos 0, that is complete writes */
389 return ERR_PTR(-ESPIPE);
391 /* freed by caller to simple_write_to_buffer */
392 data = aa_loaddata_alloc(alloc_size);
396 data->size = copy_size;
397 if (copy_from_user(data->data, userbuf, copy_size)) {
399 return ERR_PTR(-EFAULT);
405 static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
406 loff_t *pos, struct aa_ns *ns)
409 struct aa_loaddata *data;
410 struct aa_profile *profile = aa_current_profile();
411 /* high level check about policy management - fine grained in
414 error = aa_may_manage_policy(profile, ns, mask);
418 data = aa_simple_write_to_buffer(buf, size, size, pos);
419 error = PTR_ERR(data);
421 error = aa_replace_profiles(ns ? ns : profile->ns, profile,
423 aa_put_loaddata(data);
429 /* .load file hook fn to load policy */
430 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
433 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
434 int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
441 static const struct file_operations aa_fs_profile_load = {
442 .write = profile_load,
443 .llseek = default_llseek,
446 /* .replace file hook fn to load and/or replace policy */
447 static ssize_t profile_replace(struct file *f, const char __user *buf,
448 size_t size, loff_t *pos)
450 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
451 int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
458 static const struct file_operations aa_fs_profile_replace = {
459 .write = profile_replace,
460 .llseek = default_llseek,
463 /* .remove file hook fn to remove loaded policy */
464 static ssize_t profile_remove(struct file *f, const char __user *buf,
465 size_t size, loff_t *pos)
467 struct aa_loaddata *data;
468 struct aa_profile *profile;
470 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
472 profile = aa_current_profile();
473 /* high level check about policy management - fine grained in
476 error = aa_may_manage_policy(profile, ns, AA_MAY_REMOVE_POLICY);
481 * aa_remove_profile needs a null terminated string so 1 extra
482 * byte is allocated and the copied data is null terminated.
484 data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
486 error = PTR_ERR(data);
488 data->data[size] = 0;
489 error = aa_remove_profiles(ns ? ns : profile->ns, profile,
491 aa_put_loaddata(data);
498 static const struct file_operations aa_fs_profile_remove = {
499 .write = profile_remove,
500 .llseek = default_llseek,
508 /* revision file hook fn for policy loads */
509 static int ns_revision_release(struct inode *inode, struct file *file)
511 struct aa_revision *rev = file->private_data;
521 static ssize_t ns_revision_read(struct file *file, char __user *buf,
522 size_t size, loff_t *ppos)
524 struct aa_revision *rev = file->private_data;
529 mutex_lock(&rev->ns->lock);
530 last_read = rev->last_read;
531 if (last_read == rev->ns->revision) {
532 mutex_unlock(&rev->ns->lock);
533 if (file->f_flags & O_NONBLOCK)
535 if (wait_event_interruptible(rev->ns->wait,
537 READ_ONCE(rev->ns->revision)))
539 mutex_lock(&rev->ns->lock);
542 avail = sprintf(buffer, "%ld\n", rev->ns->revision);
543 if (*ppos + size > avail) {
544 rev->last_read = rev->ns->revision;
547 mutex_unlock(&rev->ns->lock);
549 return simple_read_from_buffer(buf, size, ppos, buffer, avail);
552 static int ns_revision_open(struct inode *inode, struct file *file)
554 struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
559 rev->ns = aa_get_ns(inode->i_private);
561 rev->ns = aa_get_current_ns();
562 file->private_data = rev;
567 static unsigned int ns_revision_poll(struct file *file, poll_table *pt)
569 struct aa_revision *rev = file->private_data;
570 unsigned int mask = 0;
573 mutex_lock(&rev->ns->lock);
574 poll_wait(file, &rev->ns->wait, pt);
575 if (rev->last_read < rev->ns->revision)
576 mask |= POLLIN | POLLRDNORM;
577 mutex_unlock(&rev->ns->lock);
583 void __aa_bump_ns_revision(struct aa_ns *ns)
586 wake_up_interruptible(&ns->wait);
589 static const struct file_operations aa_fs_ns_revision_fops = {
590 .owner = THIS_MODULE,
591 .open = ns_revision_open,
592 .poll = ns_revision_poll,
593 .read = ns_revision_read,
594 .llseek = generic_file_llseek,
595 .release = ns_revision_release,
599 * query_data - queries a policy and writes its data to buf
600 * @buf: the resulting data is stored here (NOT NULL)
601 * @buf_len: size of buf
602 * @query: query string used to retrieve data
603 * @query_len: size of query including second NUL byte
605 * The buffers pointed to by buf and query may overlap. The query buffer is
606 * parsed before buf is written to.
608 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
609 * the security confinement context and <KEY> is the name of the data to
610 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
612 * Don't expect the contents of buf to be preserved on failure.
614 * Returns: number of characters written to buf or -errno on failure
616 static ssize_t query_data(char *buf, size_t buf_len,
617 char *query, size_t query_len)
621 struct aa_profile *profile;
622 struct aa_data *data;
627 return -EINVAL; /* need a query */
629 key = query + strnlen(query, query_len) + 1;
630 if (key + 1 >= query + query_len)
631 return -EINVAL; /* not enough space for a non-empty key */
632 if (key + strnlen(key, query + query_len - key) >= query + query_len)
633 return -EINVAL; /* must end with NUL */
635 if (buf_len < sizeof(bytes) + sizeof(blocks))
636 return -EINVAL; /* not enough space */
638 profile = aa_current_profile();
640 /* We are going to leave space for two numbers. The first is the total
641 * number of bytes we are writing after the first number. This is so
642 * users can read the full output without reallocation.
644 * The second number is the number of data blocks we're writing. An
645 * application might be confined by multiple policies having data in
648 memset(buf, 0, sizeof(bytes) + sizeof(blocks));
649 out = buf + sizeof(bytes) + sizeof(blocks);
653 data = rhashtable_lookup_fast(profile->data, &key,
657 if (out + sizeof(outle32) + data->size > buf + buf_len)
658 return -EINVAL; /* not enough space */
659 outle32 = __cpu_to_le32(data->size);
660 memcpy(out, &outle32, sizeof(outle32));
661 out += sizeof(outle32);
662 memcpy(out, data->data, data->size);
668 outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
669 memcpy(buf, &outle32, sizeof(outle32));
670 outle32 = __cpu_to_le32(blocks);
671 memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
676 #define QUERY_CMD_DATA "data\0"
677 #define QUERY_CMD_DATA_LEN 5
680 * aa_write_access - generic permissions and data query
681 * @file: pointer to open apparmorfs/access file
682 * @ubuf: user buffer containing the complete query string (NOT NULL)
683 * @count: size of ubuf
684 * @ppos: position in the file (MUST BE ZERO)
686 * Allows for one permissions or data query per open(), write(), and read()
687 * sequence. The only queries currently supported are label-based queries for
688 * permissions or data.
690 * For permissions queries, ubuf must begin with "label\0", followed by the
691 * profile query specific format described in the query_label() function
694 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
695 * <LABEL> is the name of the security confinement context and <KEY> is the
696 * name of the data to retrieve.
698 * Returns: number of bytes written or -errno on failure
700 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
701 size_t count, loff_t *ppos)
709 buf = simple_transaction_get(file, ubuf, count);
713 if (count > QUERY_CMD_DATA_LEN &&
714 !memcmp(buf, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
715 len = query_data(buf, SIMPLE_TRANSACTION_LIMIT,
716 buf + QUERY_CMD_DATA_LEN,
717 count - QUERY_CMD_DATA_LEN);
724 simple_transaction_set(file, len);
729 static const struct file_operations aa_sfs_access = {
730 .write = aa_write_access,
731 .read = simple_transaction_read,
732 .release = simple_transaction_release,
733 .llseek = generic_file_llseek,
736 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
738 struct aa_sfs_entry *fs_file = seq->private;
743 switch (fs_file->v_type) {
744 case AA_SFS_TYPE_BOOLEAN:
745 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
747 case AA_SFS_TYPE_STRING:
748 seq_printf(seq, "%s\n", fs_file->v.string);
750 case AA_SFS_TYPE_U64:
751 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
754 /* Ignore unpritable entry types. */
761 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
763 return single_open(file, aa_sfs_seq_show, inode->i_private);
766 const struct file_operations aa_sfs_seq_file_ops = {
767 .owner = THIS_MODULE,
768 .open = aa_sfs_seq_open,
771 .release = single_release,
775 * profile based file operations
776 * policy/profiles/XXXX/profiles/ *
779 #define SEQ_PROFILE_FOPS(NAME) \
780 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
782 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
785 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
786 .owner = THIS_MODULE, \
787 .open = seq_profile_ ##NAME ##_open, \
789 .llseek = seq_lseek, \
790 .release = seq_profile_release, \
793 static int seq_profile_open(struct inode *inode, struct file *file,
794 int (*show)(struct seq_file *, void *))
796 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
797 int error = single_open(file, show, proxy);
800 file->private_data = NULL;
807 static int seq_profile_release(struct inode *inode, struct file *file)
809 struct seq_file *seq = (struct seq_file *) file->private_data;
811 aa_put_proxy(seq->private);
812 return single_release(inode, file);
815 static int seq_profile_name_show(struct seq_file *seq, void *v)
817 struct aa_proxy *proxy = seq->private;
818 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
819 seq_printf(seq, "%s\n", profile->base.name);
820 aa_put_profile(profile);
825 static int seq_profile_mode_show(struct seq_file *seq, void *v)
827 struct aa_proxy *proxy = seq->private;
828 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
829 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
830 aa_put_profile(profile);
835 static int seq_profile_attach_show(struct seq_file *seq, void *v)
837 struct aa_proxy *proxy = seq->private;
838 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
840 seq_printf(seq, "%s\n", profile->attach);
841 else if (profile->xmatch)
842 seq_puts(seq, "<unknown>\n");
844 seq_printf(seq, "%s\n", profile->base.name);
845 aa_put_profile(profile);
850 static int seq_profile_hash_show(struct seq_file *seq, void *v)
852 struct aa_proxy *proxy = seq->private;
853 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
854 unsigned int i, size = aa_hash_size();
857 for (i = 0; i < size; i++)
858 seq_printf(seq, "%.2x", profile->hash[i]);
861 aa_put_profile(profile);
866 SEQ_PROFILE_FOPS(name);
867 SEQ_PROFILE_FOPS(mode);
868 SEQ_PROFILE_FOPS(attach);
869 SEQ_PROFILE_FOPS(hash);
872 * namespace based files
873 * several root files and
877 #define SEQ_NS_FOPS(NAME) \
878 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
880 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
883 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
884 .owner = THIS_MODULE, \
885 .open = seq_ns_ ##NAME ##_open, \
887 .llseek = seq_lseek, \
888 .release = single_release, \
891 static int seq_ns_level_show(struct seq_file *seq, void *v)
893 struct aa_ns *ns = aa_current_profile()->ns;
895 seq_printf(seq, "%d\n", ns->level);
900 static int seq_ns_name_show(struct seq_file *seq, void *v)
902 struct aa_ns *ns = aa_current_profile()->ns;
904 seq_printf(seq, "%s\n", ns->base.name);
913 /* policy/raw_data/ * file ops */
915 #define SEQ_RAWDATA_FOPS(NAME) \
916 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
918 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
921 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
922 .owner = THIS_MODULE, \
923 .open = seq_rawdata_ ##NAME ##_open, \
925 .llseek = seq_lseek, \
926 .release = seq_rawdata_release, \
929 static int seq_rawdata_open(struct inode *inode, struct file *file,
930 int (*show)(struct seq_file *, void *))
932 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
936 /* lost race this ent is being reaped */
939 error = single_open(file, show, data);
941 AA_BUG(file->private_data &&
942 ((struct seq_file *)file->private_data)->private);
943 aa_put_loaddata(data);
949 static int seq_rawdata_release(struct inode *inode, struct file *file)
951 struct seq_file *seq = (struct seq_file *) file->private_data;
954 aa_put_loaddata(seq->private);
956 return single_release(inode, file);
959 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
961 struct aa_loaddata *data = seq->private;
963 seq_printf(seq, "v%d\n", data->abi);
968 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
970 struct aa_loaddata *data = seq->private;
972 seq_printf(seq, "%ld\n", data->revision);
977 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
979 struct aa_loaddata *data = seq->private;
980 unsigned int i, size = aa_hash_size();
983 for (i = 0; i < size; i++)
984 seq_printf(seq, "%.2x", data->hash[i]);
991 SEQ_RAWDATA_FOPS(abi);
992 SEQ_RAWDATA_FOPS(revision);
993 SEQ_RAWDATA_FOPS(hash);
995 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
998 struct aa_loaddata *rawdata = file->private_data;
1000 return simple_read_from_buffer(buf, size, ppos, rawdata->data,
1004 static int rawdata_release(struct inode *inode, struct file *file)
1006 aa_put_loaddata(file->private_data);
1011 static int rawdata_open(struct inode *inode, struct file *file)
1013 if (!policy_view_capable(NULL))
1015 file->private_data = __aa_get_loaddata(inode->i_private);
1016 if (!file->private_data)
1017 /* lost race: this entry is being reaped */
1023 static const struct file_operations rawdata_fops = {
1024 .open = rawdata_open,
1025 .read = rawdata_read,
1026 .llseek = generic_file_llseek,
1027 .release = rawdata_release,
1030 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1034 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1035 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1036 /* no refcounts on i_private */
1037 aafs_remove(rawdata->dents[i]);
1038 rawdata->dents[i] = NULL;
1043 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1045 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1048 remove_rawdata_dents(rawdata);
1049 list_del_init(&rawdata->list);
1050 aa_put_ns(rawdata->ns);
1055 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1057 struct dentry *dent, *dir;
1061 AA_BUG(!mutex_is_locked(&ns->lock));
1062 AA_BUG(!ns_subdata_dir(ns));
1065 * just use ns revision dir was originally created at. This is
1066 * under ns->lock and if load is successful revision will be
1067 * bumped and is guaranteed to be unique
1069 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1073 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1075 /* ->name freed when rawdata freed */
1076 return PTR_ERR(dir);
1077 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1079 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1080 &seq_rawdata_abi_fops);
1083 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1085 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1086 &seq_rawdata_revision_fops);
1089 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1091 if (aa_g_hash_policy) {
1092 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1093 rawdata, &seq_rawdata_hash_fops);
1096 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1099 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1100 dir, rawdata, &rawdata_fops);
1103 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1104 d_inode(dent)->i_size = rawdata->size;
1106 rawdata->ns = aa_get_ns(ns);
1107 list_add(&rawdata->list, &ns->rawdata_list);
1108 /* no refcount on inode rawdata */
1113 remove_rawdata_dents(rawdata);
1115 return PTR_ERR(dent);
1118 /** fns to setup dynamic per profile/namespace files **/
1122 * Requires: @profile->ns->lock held
1124 void __aafs_profile_rmdir(struct aa_profile *profile)
1126 struct aa_profile *child;
1132 list_for_each_entry(child, &profile->base.profiles, base.list)
1133 __aafs_profile_rmdir(child);
1135 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1136 struct aa_proxy *proxy;
1137 if (!profile->dents[i])
1140 proxy = d_inode(profile->dents[i])->i_private;
1141 aafs_remove(profile->dents[i]);
1142 aa_put_proxy(proxy);
1143 profile->dents[i] = NULL;
1149 * Requires: @old->ns->lock held
1151 void __aafs_profile_migrate_dents(struct aa_profile *old,
1152 struct aa_profile *new)
1156 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1157 new->dents[i] = old->dents[i];
1159 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
1160 old->dents[i] = NULL;
1164 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1165 struct aa_profile *profile,
1166 const struct file_operations *fops)
1168 struct aa_proxy *proxy = aa_get_proxy(profile->proxy);
1169 struct dentry *dent;
1171 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1173 aa_put_proxy(proxy);
1178 static int profile_depth(struct aa_profile *profile)
1183 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1190 static int gen_symlink_name(char *buffer, size_t bsize, int depth,
1191 const char *dirname, const char *fname)
1195 for (; depth > 0; depth--) {
1197 return -ENAMETOOLONG;
1198 strcpy(buffer, "../../");
1203 error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname);
1204 if (error >= bsize || error < 0)
1205 return -ENAMETOOLONG;
1211 * Requires: @profile->ns->lock held
1213 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1215 struct aa_profile *child;
1216 struct dentry *dent = NULL, *dir;
1220 struct aa_profile *p;
1221 p = aa_deref_parent(profile);
1223 /* adding to parent that previously didn't have children */
1224 dent = aafs_create_dir("profiles", dent);
1227 prof_child_dir(p) = parent = dent;
1230 if (!profile->dirname) {
1232 len = mangle_name(profile->base.name, NULL);
1233 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1235 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1236 if (!profile->dirname) {
1241 mangle_name(profile->base.name, profile->dirname);
1242 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1245 dent = aafs_create_dir(profile->dirname, parent);
1248 prof_dir(profile) = dir = dent;
1250 dent = create_profile_file(dir, "name", profile,
1251 &seq_profile_name_fops);
1254 profile->dents[AAFS_PROF_NAME] = dent;
1256 dent = create_profile_file(dir, "mode", profile,
1257 &seq_profile_mode_fops);
1260 profile->dents[AAFS_PROF_MODE] = dent;
1262 dent = create_profile_file(dir, "attach", profile,
1263 &seq_profile_attach_fops);
1266 profile->dents[AAFS_PROF_ATTACH] = dent;
1268 if (profile->hash) {
1269 dent = create_profile_file(dir, "sha1", profile,
1270 &seq_profile_hash_fops);
1273 profile->dents[AAFS_PROF_HASH] = dent;
1276 if (profile->rawdata) {
1278 int depth = profile_depth(profile);
1280 error = gen_symlink_name(target, sizeof(target), depth,
1281 profile->rawdata->name, "sha1");
1284 dent = aafs_create_symlink("raw_sha1", dir, target, NULL);
1287 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1289 error = gen_symlink_name(target, sizeof(target), depth,
1290 profile->rawdata->name, "abi");
1293 dent = aafs_create_symlink("raw_abi", dir, target, NULL);
1296 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1298 error = gen_symlink_name(target, sizeof(target), depth,
1299 profile->rawdata->name, "raw_data");
1302 dent = aafs_create_symlink("raw_data", dir, target, NULL);
1305 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1308 list_for_each_entry(child, &profile->base.profiles, base.list) {
1309 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1317 error = PTR_ERR(dent);
1320 __aafs_profile_rmdir(profile);
1325 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1327 struct aa_loaddata *ent, *tmp;
1329 AA_BUG(!mutex_is_locked(&ns->lock));
1331 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1332 __aa_fs_remove_rawdata(ent);
1337 * Requires: @ns->lock held
1339 void __aafs_ns_rmdir(struct aa_ns *ns)
1342 struct aa_profile *child;
1348 list_for_each_entry(child, &ns->base.profiles, base.list)
1349 __aafs_profile_rmdir(child);
1351 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1352 mutex_lock(&sub->lock);
1353 __aafs_ns_rmdir(sub);
1354 mutex_unlock(&sub->lock);
1357 __aa_fs_list_remove_rawdata(ns);
1359 if (ns_subns_dir(ns)) {
1360 sub = d_inode(ns_subns_dir(ns))->i_private;
1363 if (ns_subload(ns)) {
1364 sub = d_inode(ns_subload(ns))->i_private;
1367 if (ns_subreplace(ns)) {
1368 sub = d_inode(ns_subreplace(ns))->i_private;
1371 if (ns_subremove(ns)) {
1372 sub = d_inode(ns_subremove(ns))->i_private;
1375 if (ns_subrevision(ns)) {
1376 sub = d_inode(ns_subrevision(ns))->i_private;
1380 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1381 aafs_remove(ns->dents[i]);
1382 ns->dents[i] = NULL;
1386 /* assumes cleanup in caller */
1387 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1389 struct dentry *dent;
1394 dent = aafs_create_dir("profiles", dir);
1396 return PTR_ERR(dent);
1397 ns_subprofs_dir(ns) = dent;
1399 dent = aafs_create_dir("raw_data", dir);
1401 return PTR_ERR(dent);
1402 ns_subdata_dir(ns) = dent;
1404 dent = aafs_create_file("revision", 0444, dir, ns,
1405 &aa_fs_ns_revision_fops);
1407 return PTR_ERR(dent);
1409 ns_subrevision(ns) = dent;
1411 dent = aafs_create_file(".load", 0640, dir, ns,
1412 &aa_fs_profile_load);
1414 return PTR_ERR(dent);
1416 ns_subload(ns) = dent;
1418 dent = aafs_create_file(".replace", 0640, dir, ns,
1419 &aa_fs_profile_replace);
1421 return PTR_ERR(dent);
1423 ns_subreplace(ns) = dent;
1425 dent = aafs_create_file(".remove", 0640, dir, ns,
1426 &aa_fs_profile_remove);
1428 return PTR_ERR(dent);
1430 ns_subremove(ns) = dent;
1432 dent = aafs_create_dir("namespaces", dir);
1434 return PTR_ERR(dent);
1436 ns_subns_dir(ns) = dent;
1442 * Requires: @ns->lock held
1444 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
1445 struct dentry *dent)
1448 struct aa_profile *child;
1454 AA_BUG(!mutex_is_locked(&ns->lock));
1457 name = ns->base.name;
1460 /* create ns dir if it doesn't already exist */
1461 dent = aafs_create_dir(name, parent);
1466 ns_dir(ns) = dir = dent;
1467 error = __aafs_ns_mkdir_entries(ns, dir);
1472 list_for_each_entry(child, &ns->base.profiles, base.list) {
1473 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
1479 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1480 mutex_lock(&sub->lock);
1481 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
1482 mutex_unlock(&sub->lock);
1490 error = PTR_ERR(dent);
1493 __aafs_ns_rmdir(ns);
1499 #define list_entry_is_head(pos, head, member) (&pos->member == (head))
1502 * __next_ns - find the next namespace to list
1503 * @root: root namespace to stop search at (NOT NULL)
1504 * @ns: current ns position (NOT NULL)
1506 * Find the next namespace from @ns under @root and handle all locking needed
1507 * while switching current namespace.
1509 * Returns: next namespace or NULL if at last namespace under @root
1510 * Requires: ns->parent->lock to be held
1511 * NOTE: will not unlock root->lock
1513 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
1515 struct aa_ns *parent, *next;
1517 /* is next namespace a child */
1518 if (!list_empty(&ns->sub_ns)) {
1519 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
1520 mutex_lock(&next->lock);
1524 /* check if the next ns is a sibling, parent, gp, .. */
1525 parent = ns->parent;
1526 while (ns != root) {
1527 mutex_unlock(&ns->lock);
1528 next = list_next_entry(ns, base.list);
1529 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
1530 mutex_lock(&next->lock);
1534 parent = parent->parent;
1541 * __first_profile - find the first profile in a namespace
1542 * @root: namespace that is root of profiles being displayed (NOT NULL)
1543 * @ns: namespace to start in (NOT NULL)
1545 * Returns: unrefcounted profile or NULL if no profile
1546 * Requires: profile->ns.lock to be held
1548 static struct aa_profile *__first_profile(struct aa_ns *root,
1551 for (; ns; ns = __next_ns(root, ns)) {
1552 if (!list_empty(&ns->base.profiles))
1553 return list_first_entry(&ns->base.profiles,
1554 struct aa_profile, base.list);
1560 * __next_profile - step to the next profile in a profile tree
1561 * @profile: current profile in tree (NOT NULL)
1563 * Perform a depth first traversal on the profile tree in a namespace
1565 * Returns: next profile or NULL if done
1566 * Requires: profile->ns.lock to be held
1568 static struct aa_profile *__next_profile(struct aa_profile *p)
1570 struct aa_profile *parent;
1571 struct aa_ns *ns = p->ns;
1573 /* is next profile a child */
1574 if (!list_empty(&p->base.profiles))
1575 return list_first_entry(&p->base.profiles, typeof(*p),
1578 /* is next profile a sibling, parent sibling, gp, sibling, .. */
1579 parent = rcu_dereference_protected(p->parent,
1580 mutex_is_locked(&p->ns->lock));
1582 p = list_next_entry(p, base.list);
1583 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
1586 parent = rcu_dereference_protected(parent->parent,
1587 mutex_is_locked(&parent->ns->lock));
1590 /* is next another profile in the namespace */
1591 p = list_next_entry(p, base.list);
1592 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
1599 * next_profile - step to the next profile in where ever it may be
1600 * @root: root namespace (NOT NULL)
1601 * @profile: current profile (NOT NULL)
1603 * Returns: next profile or NULL if there isn't one
1605 static struct aa_profile *next_profile(struct aa_ns *root,
1606 struct aa_profile *profile)
1608 struct aa_profile *next = __next_profile(profile);
1612 /* finished all profiles in namespace move to next namespace */
1613 return __first_profile(root, __next_ns(root, profile->ns));
1617 * p_start - start a depth first traversal of profile tree
1618 * @f: seq_file to fill
1619 * @pos: current position
1621 * Returns: first profile under current namespace or NULL if none found
1623 * acquires first ns->lock
1625 static void *p_start(struct seq_file *f, loff_t *pos)
1627 struct aa_profile *profile = NULL;
1628 struct aa_ns *root = aa_current_profile()->ns;
1630 f->private = aa_get_ns(root);
1633 /* find the first profile */
1634 mutex_lock(&root->lock);
1635 profile = __first_profile(root, root);
1637 /* skip to position */
1638 for (; profile && l > 0; l--)
1639 profile = next_profile(root, profile);
1645 * p_next - read the next profile entry
1646 * @f: seq_file to fill
1647 * @p: profile previously returned
1648 * @pos: current position
1650 * Returns: next profile after @p or NULL if none
1652 * may acquire/release locks in namespace tree as necessary
1654 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
1656 struct aa_profile *profile = p;
1657 struct aa_ns *ns = f->private;
1660 return next_profile(ns, profile);
1664 * p_stop - stop depth first traversal
1665 * @f: seq_file we are filling
1666 * @p: the last profile writen
1668 * Release all locking done by p_start/p_next on namespace tree
1670 static void p_stop(struct seq_file *f, void *p)
1672 struct aa_profile *profile = p;
1673 struct aa_ns *root = f->private, *ns;
1676 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
1677 mutex_unlock(&ns->lock);
1679 mutex_unlock(&root->lock);
1684 * seq_show_profile - show a profile entry
1685 * @f: seq_file to file
1686 * @p: current position (profile) (NOT NULL)
1688 * Returns: error on failure
1690 static int seq_show_profile(struct seq_file *f, void *p)
1692 struct aa_profile *profile = (struct aa_profile *)p;
1693 struct aa_ns *root = f->private;
1695 if (profile->ns != root)
1696 seq_printf(f, ":%s://", aa_ns_name(root, profile->ns, true));
1697 seq_printf(f, "%s (%s)\n", profile->base.hname,
1698 aa_profile_mode_names[profile->mode]);
1703 static const struct seq_operations aa_sfs_profiles_op = {
1707 .show = seq_show_profile,
1710 static int profiles_open(struct inode *inode, struct file *file)
1712 if (!policy_view_capable(NULL))
1715 return seq_open(file, &aa_sfs_profiles_op);
1718 static int profiles_release(struct inode *inode, struct file *file)
1720 return seq_release(inode, file);
1723 static const struct file_operations aa_sfs_profiles_fops = {
1724 .open = profiles_open,
1726 .llseek = seq_lseek,
1727 .release = profiles_release,
1731 /** Base file system setup **/
1732 static struct aa_sfs_entry aa_sfs_entry_file[] = {
1733 AA_SFS_FILE_STRING("mask",
1734 "create read write exec append mmap_exec link lock"),
1738 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
1739 AA_SFS_FILE_BOOLEAN("change_hat", 1),
1740 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
1741 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
1742 AA_SFS_FILE_BOOLEAN("change_profile", 1),
1743 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
1744 AA_SFS_FILE_STRING("version", "1.2"),
1748 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
1749 AA_SFS_FILE_BOOLEAN("v5", 1),
1753 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
1754 AA_SFS_DIR("versions", aa_sfs_entry_versions),
1755 AA_SFS_FILE_BOOLEAN("set_load", 1),
1759 static struct aa_sfs_entry aa_sfs_entry_features[] = {
1760 AA_SFS_DIR("policy", aa_sfs_entry_policy),
1761 AA_SFS_DIR("domain", aa_sfs_entry_domain),
1762 AA_SFS_DIR("file", aa_sfs_entry_file),
1763 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
1764 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
1765 AA_SFS_DIR("caps", aa_sfs_entry_caps),
1769 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
1770 AA_SFS_FILE_FOPS(".access", 0640, &aa_sfs_access),
1771 AA_SFS_FILE_FOPS(".ns_level", 0666, &seq_ns_level_fops),
1772 AA_SFS_FILE_FOPS(".ns_name", 0640, &seq_ns_name_fops),
1773 AA_SFS_FILE_FOPS("profiles", 0440, &aa_sfs_profiles_fops),
1774 AA_SFS_DIR("features", aa_sfs_entry_features),
1778 static struct aa_sfs_entry aa_sfs_entry =
1779 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
1782 * entry_create_file - create a file entry in the apparmor securityfs
1783 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
1784 * @parent: the parent dentry in the securityfs
1786 * Use entry_remove_file to remove entries created with this fn.
1788 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
1789 struct dentry *parent)
1793 fs_file->dentry = securityfs_create_file(fs_file->name,
1794 S_IFREG | fs_file->mode,
1797 if (IS_ERR(fs_file->dentry)) {
1798 error = PTR_ERR(fs_file->dentry);
1799 fs_file->dentry = NULL;
1804 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
1806 * entry_create_dir - recursively create a directory entry in the securityfs
1807 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
1808 * @parent: the parent dentry in the securityfs
1810 * Use entry_remove_dir to remove entries created with this fn.
1812 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
1813 struct dentry *parent)
1815 struct aa_sfs_entry *fs_file;
1819 dir = securityfs_create_dir(fs_dir->name, parent);
1821 return PTR_ERR(dir);
1822 fs_dir->dentry = dir;
1824 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1825 if (fs_file->v_type == AA_SFS_TYPE_DIR)
1826 error = entry_create_dir(fs_file, fs_dir->dentry);
1828 error = entry_create_file(fs_file, fs_dir->dentry);
1836 entry_remove_dir(fs_dir);
1842 * entry_remove_file - drop a single file entry in the apparmor securityfs
1843 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
1845 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
1847 if (!fs_file->dentry)
1850 securityfs_remove(fs_file->dentry);
1851 fs_file->dentry = NULL;
1855 * entry_remove_dir - recursively drop a directory entry from the securityfs
1856 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
1858 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
1860 struct aa_sfs_entry *fs_file;
1862 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1863 if (fs_file->v_type == AA_SFS_TYPE_DIR)
1864 entry_remove_dir(fs_file);
1866 entry_remove_file(fs_file);
1869 entry_remove_file(fs_dir);
1873 * aa_destroy_aafs - cleanup and free aafs
1875 * releases dentries allocated by aa_create_aafs
1877 void __init aa_destroy_aafs(void)
1879 entry_remove_dir(&aa_sfs_entry);
1883 #define NULL_FILE_NAME ".null"
1884 struct path aa_null;
1886 static int aa_mk_null_file(struct dentry *parent)
1888 struct vfsmount *mount = NULL;
1889 struct dentry *dentry;
1890 struct inode *inode;
1892 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
1897 inode_lock(d_inode(parent));
1898 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
1899 if (IS_ERR(dentry)) {
1900 error = PTR_ERR(dentry);
1903 inode = new_inode(parent->d_inode->i_sb);
1909 inode->i_ino = get_next_ino();
1910 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
1911 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
1912 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
1913 MKDEV(MEM_MAJOR, 3));
1914 d_instantiate(dentry, inode);
1915 aa_null.dentry = dget(dentry);
1916 aa_null.mnt = mntget(mount);
1923 inode_unlock(d_inode(parent));
1924 simple_release_fs(&mount, &count);
1930 static const char *policy_get_link(struct dentry *dentry,
1931 struct inode *inode,
1932 struct delayed_call *done)
1938 return ERR_PTR(-ECHILD);
1939 ns = aa_get_current_ns();
1940 path.mnt = mntget(aafs_mnt);
1941 path.dentry = dget(ns_dir(ns));
1942 nd_jump_link(&path);
1948 static int ns_get_name(char *buf, size_t size, struct aa_ns *ns,
1949 struct inode *inode)
1951 int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino);
1953 if (res < 0 || res >= size)
1959 static int policy_readlink(struct dentry *dentry, char __user *buffer,
1966 ns = aa_get_current_ns();
1967 res = ns_get_name(name, sizeof(name), ns, d_inode(dentry));
1969 res = readlink_copy(buffer, buflen, name);
1975 static const struct inode_operations policy_link_iops = {
1976 .readlink = policy_readlink,
1977 .get_link = policy_get_link,
1982 * aa_create_aafs - create the apparmor security filesystem
1984 * dentries created here are released by aa_destroy_aafs
1986 * Returns: error on failure
1988 static int __init aa_create_aafs(void)
1990 struct dentry *dent;
1993 if (!apparmor_initialized)
1996 if (aa_sfs_entry.dentry) {
1997 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2001 /* setup apparmorfs used to virtualize policy/ */
2002 aafs_mnt = kern_mount(&aafs_ops);
2003 if (IS_ERR(aafs_mnt))
2004 panic("can't set apparmorfs up\n");
2005 aafs_mnt->mnt_sb->s_flags &= ~MS_NOUSER;
2007 /* Populate fs tree. */
2008 error = entry_create_dir(&aa_sfs_entry, NULL);
2012 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2013 NULL, &aa_fs_profile_load);
2015 error = PTR_ERR(dent);
2018 ns_subload(root_ns) = dent;
2020 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2021 NULL, &aa_fs_profile_replace);
2023 error = PTR_ERR(dent);
2026 ns_subreplace(root_ns) = dent;
2028 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2029 NULL, &aa_fs_profile_remove);
2031 error = PTR_ERR(dent);
2034 ns_subremove(root_ns) = dent;
2036 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2037 NULL, &aa_fs_ns_revision_fops);
2039 error = PTR_ERR(dent);
2042 ns_subrevision(root_ns) = dent;
2044 /* policy tree referenced by magic policy symlink */
2045 mutex_lock(&root_ns->lock);
2046 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2047 aafs_mnt->mnt_root);
2048 mutex_unlock(&root_ns->lock);
2052 /* magic symlink similar to nsfs redirects based on task policy */
2053 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2054 NULL, &policy_link_iops);
2056 error = PTR_ERR(dent);
2060 error = aa_mk_null_file(aa_sfs_entry.dentry);
2064 /* TODO: add default profile to apparmorfs */
2066 /* Report that AppArmor fs is enabled */
2067 aa_info_message("AppArmor Filesystem Enabled");
2072 AA_ERROR("Error creating AppArmor securityfs\n");
2076 fs_initcall(aa_create_aafs);