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/label.h"
37 #include "include/policy.h"
38 #include "include/policy_ns.h"
39 #include "include/resource.h"
40 #include "include/policy_unpack.h"
43 * The apparmor filesystem interface used for policy load and introspection
44 * The interface is split into two main components based on their function
45 * a securityfs component:
46 * used for static files that are always available, and which allows
47 * userspace to specificy the location of the security filesystem.
49 * fns and data are prefixed with
52 * an apparmorfs component:
53 * used loaded policy content and introspection. It is not part of a
54 * regular mounted filesystem and is available only through the magic
55 * policy symlink in the root of the securityfs apparmor/ directory.
56 * Tasks queries will be magically redirected to the correct portion
57 * of the policy tree based on their confinement.
59 * fns and data are prefixed with
62 * The aa_fs_ prefix is used to indicate the fn is used by both the
63 * securityfs and apparmorfs filesystems.
72 * aa_mangle_name - mangle a profile name to std profile layout form
73 * @name: profile name to mangle (NOT NULL)
74 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
76 * Returns: length of mangled name
78 static int mangle_name(const char *name, char *target)
82 while (*name == '/' || *name == '.')
86 for (; *name; name++) {
89 else if (isspace(*name))
91 else if (isalnum(*name) || strchr("._-", *name))
98 for (; *name; name++) {
99 if (isalnum(*name) || isspace(*name) ||
100 strchr("/._-", *name))
112 * aafs - core fns and data for the policy tree
115 #define AAFS_NAME "apparmorfs"
116 static struct vfsmount *aafs_mnt;
117 static int aafs_count;
120 static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
122 struct inode *inode = d_inode(dentry);
124 seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino);
128 static void aafs_evict_inode(struct inode *inode)
130 truncate_inode_pages_final(&inode->i_data);
132 if (S_ISLNK(inode->i_mode))
133 kfree(inode->i_link);
136 static const struct super_operations aafs_super_ops = {
137 .statfs = simple_statfs,
138 .evict_inode = aafs_evict_inode,
139 .show_path = aafs_show_path,
142 static int fill_super(struct super_block *sb, void *data, int silent)
144 static struct tree_descr files[] = { {""} };
147 error = simple_fill_super(sb, AAFS_MAGIC, files);
150 sb->s_op = &aafs_super_ops;
155 static struct dentry *aafs_mount(struct file_system_type *fs_type,
156 int flags, const char *dev_name, void *data)
158 return mount_single(fs_type, flags, data, fill_super);
161 static struct file_system_type aafs_ops = {
162 .owner = THIS_MODULE,
165 .kill_sb = kill_anon_super,
169 * __aafs_setup_d_inode - basic inode setup for apparmorfs
170 * @dir: parent directory for the dentry
171 * @dentry: dentry we are seting the inode up for
172 * @mode: permissions the file should have
173 * @data: data to store on inode.i_private, available in open()
174 * @link: if symlink, symlink target string
175 * @fops: struct file_operations that should be used
176 * @iops: struct of inode_operations that should be used
178 static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
179 umode_t mode, void *data, char *link,
180 const struct file_operations *fops,
181 const struct inode_operations *iops)
183 struct inode *inode = new_inode(dir->i_sb);
191 inode->i_ino = get_next_ino();
192 inode->i_mode = mode;
193 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
194 inode->i_private = data;
196 inode->i_op = iops ? iops : &simple_dir_inode_operations;
197 inode->i_fop = &simple_dir_operations;
200 } else if (S_ISLNK(mode)) {
201 inode->i_op = iops ? iops : &simple_symlink_inode_operations;
202 inode->i_link = link;
206 d_instantiate(dentry, inode);
213 * aafs_create - create a dentry in the apparmorfs filesystem
215 * @name: name of dentry to create
216 * @mode: permissions the file should have
217 * @parent: parent directory for this dentry
218 * @data: data to store on inode.i_private, available in open()
219 * @link: if symlink, symlink target string
220 * @fops: struct file_operations that should be used for
221 * @iops: struct of inode_operations that should be used
223 * This is the basic "create a xxx" function for apparmorfs.
225 * Returns a pointer to a dentry if it succeeds, that must be free with
226 * aafs_remove(). Will return ERR_PTR on failure.
228 static struct dentry *aafs_create(const char *name, umode_t mode,
229 struct dentry *parent, void *data, void *link,
230 const struct file_operations *fops,
231 const struct inode_operations *iops)
233 struct dentry *dentry;
240 if (!(mode & S_IFMT))
241 mode = (mode & S_IALLUGO) | S_IFREG;
243 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
245 return ERR_PTR(error);
247 dir = d_inode(parent);
250 dentry = lookup_one_len(name, parent, strlen(name));
254 if (d_really_is_positive(dentry)) {
259 error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
271 simple_release_fs(&aafs_mnt, &aafs_count);
273 return ERR_PTR(error);
277 * aafs_create_file - create a file in the apparmorfs filesystem
279 * @name: name of dentry to create
280 * @mode: permissions the file should have
281 * @parent: parent directory for this dentry
282 * @data: data to store on inode.i_private, available in open()
283 * @fops: struct file_operations that should be used for
287 static struct dentry *aafs_create_file(const char *name, umode_t mode,
288 struct dentry *parent, void *data,
289 const struct file_operations *fops)
291 return aafs_create(name, mode, parent, data, NULL, fops, NULL);
295 * aafs_create_dir - create a directory in the apparmorfs filesystem
297 * @name: name of dentry to create
298 * @parent: parent directory for this dentry
302 static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
304 return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
309 * aafs_create_symlink - create a symlink in the apparmorfs filesystem
310 * @name: name of dentry to create
311 * @parent: parent directory for this dentry
312 * @target: if symlink, symlink target string
313 * @iops: struct of inode_operations that should be used
315 * If @target parameter is %NULL, then the @iops parameter needs to be
316 * setup to handle .readlink and .get_link inode_operations.
318 static struct dentry *aafs_create_symlink(const char *name,
319 struct dentry *parent,
321 const struct inode_operations *iops)
327 link = kstrdup(target, GFP_KERNEL);
329 return ERR_PTR(-ENOMEM);
331 dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL,
340 * aafs_remove - removes a file or directory from the apparmorfs filesystem
342 * @dentry: dentry of the file/directory/symlink to removed.
344 static void aafs_remove(struct dentry *dentry)
348 if (!dentry || IS_ERR(dentry))
351 dir = d_inode(dentry->d_parent);
353 if (simple_positive(dentry)) {
354 if (d_is_dir(dentry))
355 simple_rmdir(dir, dentry);
357 simple_unlink(dir, dentry);
361 simple_release_fs(&aafs_mnt, &aafs_count);
366 * aa_fs - policy load/replace/remove
370 * aa_simple_write_to_buffer - common routine for getting policy from user
371 * @userbuf: user buffer to copy data from (NOT NULL)
372 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
373 * @copy_size: size of data to copy from user buffer
374 * @pos: position write is at in the file (NOT NULL)
376 * Returns: kernel buffer containing copy of user buffer data or an
377 * ERR_PTR on failure.
379 static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
384 struct aa_loaddata *data;
386 AA_BUG(copy_size > alloc_size);
389 /* only writes from pos 0, that is complete writes */
390 return ERR_PTR(-ESPIPE);
392 /* freed by caller to simple_write_to_buffer */
393 data = aa_loaddata_alloc(alloc_size);
397 data->size = copy_size;
398 if (copy_from_user(data->data, userbuf, copy_size)) {
400 return ERR_PTR(-EFAULT);
406 static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
407 loff_t *pos, struct aa_ns *ns)
409 struct aa_loaddata *data;
410 struct aa_label *label;
413 label = begin_current_label_crit_section();
415 /* high level check about policy management - fine grained in
418 error = aa_may_manage_policy(label, ns, mask);
422 data = aa_simple_write_to_buffer(buf, size, size, pos);
423 error = PTR_ERR(data);
425 error = aa_replace_profiles(ns, label, mask, data);
426 aa_put_loaddata(data);
428 end_current_label_crit_section(label);
433 /* .load file hook fn to load policy */
434 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
437 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
438 int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
445 static const struct file_operations aa_fs_profile_load = {
446 .write = profile_load,
447 .llseek = default_llseek,
450 /* .replace file hook fn to load and/or replace policy */
451 static ssize_t profile_replace(struct file *f, const char __user *buf,
452 size_t size, loff_t *pos)
454 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
455 int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
462 static const struct file_operations aa_fs_profile_replace = {
463 .write = profile_replace,
464 .llseek = default_llseek,
467 /* .remove file hook fn to remove loaded policy */
468 static ssize_t profile_remove(struct file *f, const char __user *buf,
469 size_t size, loff_t *pos)
471 struct aa_loaddata *data;
472 struct aa_label *label;
474 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
476 label = begin_current_label_crit_section();
477 /* high level check about policy management - fine grained in
480 error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY);
485 * aa_remove_profile needs a null terminated string so 1 extra
486 * byte is allocated and the copied data is null terminated.
488 data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
490 error = PTR_ERR(data);
492 data->data[size] = 0;
493 error = aa_remove_profiles(ns, label, data->data, size);
494 aa_put_loaddata(data);
497 end_current_label_crit_section(label);
502 static const struct file_operations aa_fs_profile_remove = {
503 .write = profile_remove,
504 .llseek = default_llseek,
512 /* revision file hook fn for policy loads */
513 static int ns_revision_release(struct inode *inode, struct file *file)
515 struct aa_revision *rev = file->private_data;
525 static ssize_t ns_revision_read(struct file *file, char __user *buf,
526 size_t size, loff_t *ppos)
528 struct aa_revision *rev = file->private_data;
533 mutex_lock(&rev->ns->lock);
534 last_read = rev->last_read;
535 if (last_read == rev->ns->revision) {
536 mutex_unlock(&rev->ns->lock);
537 if (file->f_flags & O_NONBLOCK)
539 if (wait_event_interruptible(rev->ns->wait,
541 READ_ONCE(rev->ns->revision)))
543 mutex_lock(&rev->ns->lock);
546 avail = sprintf(buffer, "%ld\n", rev->ns->revision);
547 if (*ppos + size > avail) {
548 rev->last_read = rev->ns->revision;
551 mutex_unlock(&rev->ns->lock);
553 return simple_read_from_buffer(buf, size, ppos, buffer, avail);
556 static int ns_revision_open(struct inode *inode, struct file *file)
558 struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
563 rev->ns = aa_get_ns(inode->i_private);
565 rev->ns = aa_get_current_ns();
566 file->private_data = rev;
571 static unsigned int ns_revision_poll(struct file *file, poll_table *pt)
573 struct aa_revision *rev = file->private_data;
574 unsigned int mask = 0;
577 mutex_lock(&rev->ns->lock);
578 poll_wait(file, &rev->ns->wait, pt);
579 if (rev->last_read < rev->ns->revision)
580 mask |= POLLIN | POLLRDNORM;
581 mutex_unlock(&rev->ns->lock);
587 void __aa_bump_ns_revision(struct aa_ns *ns)
590 wake_up_interruptible(&ns->wait);
593 static const struct file_operations aa_fs_ns_revision_fops = {
594 .owner = THIS_MODULE,
595 .open = ns_revision_open,
596 .poll = ns_revision_poll,
597 .read = ns_revision_read,
598 .llseek = generic_file_llseek,
599 .release = ns_revision_release,
602 static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
603 const char *match_str, size_t match_len)
607 unsigned int state = 0;
609 if (profile_unconfined(profile))
611 if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
612 dfa = profile->file.dfa;
613 state = aa_dfa_match_len(dfa, profile->file.start,
614 match_str + 1, match_len - 1);
617 struct path_cond cond = { };
619 tmp = aa_compute_fperms(dfa, state, &cond);
621 } else if (profile->policy.dfa) {
622 if (!PROFILE_MEDIATES_SAFE(profile, *match_str))
623 return; /* no change to current perms */
624 dfa = profile->policy.dfa;
625 state = aa_dfa_match_len(dfa, profile->policy.start[0],
626 match_str, match_len);
628 aa_compute_perms(dfa, state, &tmp);
632 aa_apply_modes_to_perms(profile, &tmp);
633 aa_perms_accum_raw(perms, &tmp);
638 * query_data - queries a policy and writes its data to buf
639 * @buf: the resulting data is stored here (NOT NULL)
640 * @buf_len: size of buf
641 * @query: query string used to retrieve data
642 * @query_len: size of query including second NUL byte
644 * The buffers pointed to by buf and query may overlap. The query buffer is
645 * parsed before buf is written to.
647 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
648 * the security confinement context and <KEY> is the name of the data to
649 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
651 * Don't expect the contents of buf to be preserved on failure.
653 * Returns: number of characters written to buf or -errno on failure
655 static ssize_t query_data(char *buf, size_t buf_len,
656 char *query, size_t query_len)
661 struct aa_label *label, *curr;
662 struct aa_profile *profile;
663 struct aa_data *data;
668 return -EINVAL; /* need a query */
670 key = query + strnlen(query, query_len) + 1;
671 if (key + 1 >= query + query_len)
672 return -EINVAL; /* not enough space for a non-empty key */
673 if (key + strnlen(key, query + query_len - key) >= query + query_len)
674 return -EINVAL; /* must end with NUL */
676 if (buf_len < sizeof(bytes) + sizeof(blocks))
677 return -EINVAL; /* not enough space */
679 curr = begin_current_label_crit_section();
680 label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
681 end_current_label_crit_section(curr);
683 return PTR_ERR(label);
685 /* We are going to leave space for two numbers. The first is the total
686 * number of bytes we are writing after the first number. This is so
687 * users can read the full output without reallocation.
689 * The second number is the number of data blocks we're writing. An
690 * application might be confined by multiple policies having data in
693 memset(buf, 0, sizeof(bytes) + sizeof(blocks));
694 out = buf + sizeof(bytes) + sizeof(blocks);
697 label_for_each_confined(i, label, profile) {
701 data = rhashtable_lookup_fast(profile->data, &key,
705 if (out + sizeof(outle32) + data->size > buf +
708 return -EINVAL; /* not enough space */
710 outle32 = __cpu_to_le32(data->size);
711 memcpy(out, &outle32, sizeof(outle32));
712 out += sizeof(outle32);
713 memcpy(out, data->data, data->size);
720 outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
721 memcpy(buf, &outle32, sizeof(outle32));
722 outle32 = __cpu_to_le32(blocks);
723 memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
729 * query_label - queries a label and writes permissions to buf
730 * @buf: the resulting permissions string is stored here (NOT NULL)
731 * @buf_len: size of buf
732 * @query: binary query string to match against the dfa
733 * @query_len: size of query
734 * @view_only: only compute for querier's view
736 * The buffers pointed to by buf and query may overlap. The query buffer is
737 * parsed before buf is written to.
739 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
740 * the name of the label, in the current namespace, that is to be queried and
741 * DFA_STRING is a binary string to match against the label(s)'s DFA.
743 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
744 * but must *not* be NUL terminated.
746 * Returns: number of characters written to buf or -errno on failure
748 static ssize_t query_label(char *buf, size_t buf_len,
749 char *query, size_t query_len, bool view_only)
751 struct aa_profile *profile;
752 struct aa_label *label, *curr;
753 char *label_name, *match_str;
754 size_t label_name_len, match_len;
755 struct aa_perms perms;
762 label_name_len = strnlen(query, query_len);
763 if (!label_name_len || label_name_len == query_len)
767 * The extra byte is to account for the null byte between the
768 * profile name and dfa string. profile_name_len is greater
769 * than zero and less than query_len, so a byte can be safely
770 * added or subtracted.
772 match_str = label_name + label_name_len + 1;
773 match_len = query_len - label_name_len - 1;
775 curr = begin_current_label_crit_section();
776 label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
777 end_current_label_crit_section(curr);
779 return PTR_ERR(label);
783 label_for_each_in_ns(i, labels_ns(label), label, profile) {
784 profile_query_cb(profile, &perms, match_str, match_len);
787 label_for_each(i, label, profile) {
788 profile_query_cb(profile, &perms, match_str, match_len);
793 return scnprintf(buf, buf_len,
794 "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
795 perms.allow, perms.deny, perms.audit, perms.quiet);
799 * Transaction based IO.
800 * The file expects a write which triggers the transaction, and then
801 * possibly a read(s) which collects the result - which is stored in a
802 * file-local buffer. Once a new write is performed, a new set of results
803 * are stored in the file-local buffer.
805 struct multi_transaction {
811 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
812 /* TODO: replace with per file lock */
813 static DEFINE_SPINLOCK(multi_transaction_lock);
815 static void multi_transaction_kref(struct kref *kref)
817 struct multi_transaction *t;
819 t = container_of(kref, struct multi_transaction, count);
820 free_page((unsigned long) t);
823 static struct multi_transaction *
824 get_multi_transaction(struct multi_transaction *t)
827 kref_get(&(t->count));
832 static void put_multi_transaction(struct multi_transaction *t)
835 kref_put(&(t->count), multi_transaction_kref);
838 /* does not increment @new's count */
839 static void multi_transaction_set(struct file *file,
840 struct multi_transaction *new, size_t n)
842 struct multi_transaction *old;
844 AA_BUG(n > MULTI_TRANSACTION_LIMIT);
847 spin_lock(&multi_transaction_lock);
848 old = (struct multi_transaction *) file->private_data;
849 file->private_data = new;
850 spin_unlock(&multi_transaction_lock);
851 put_multi_transaction(old);
854 static struct multi_transaction *multi_transaction_new(struct file *file,
855 const char __user *buf,
858 struct multi_transaction *t;
860 if (size > MULTI_TRANSACTION_LIMIT - 1)
861 return ERR_PTR(-EFBIG);
863 t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
865 return ERR_PTR(-ENOMEM);
866 kref_init(&t->count);
867 if (copy_from_user(t->data, buf, size))
868 return ERR_PTR(-EFAULT);
873 static ssize_t multi_transaction_read(struct file *file, char __user *buf,
874 size_t size, loff_t *pos)
876 struct multi_transaction *t;
879 spin_lock(&multi_transaction_lock);
880 t = get_multi_transaction(file->private_data);
881 spin_unlock(&multi_transaction_lock);
885 ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
886 put_multi_transaction(t);
891 static int multi_transaction_release(struct inode *inode, struct file *file)
893 put_multi_transaction(file->private_data);
898 #define QUERY_CMD_LABEL "label\0"
899 #define QUERY_CMD_LABEL_LEN 6
900 #define QUERY_CMD_PROFILE "profile\0"
901 #define QUERY_CMD_PROFILE_LEN 8
902 #define QUERY_CMD_LABELALL "labelall\0"
903 #define QUERY_CMD_LABELALL_LEN 9
904 #define QUERY_CMD_DATA "data\0"
905 #define QUERY_CMD_DATA_LEN 5
908 * aa_write_access - generic permissions and data query
909 * @file: pointer to open apparmorfs/access file
910 * @ubuf: user buffer containing the complete query string (NOT NULL)
911 * @count: size of ubuf
912 * @ppos: position in the file (MUST BE ZERO)
914 * Allows for one permissions or data query per open(), write(), and read()
915 * sequence. The only queries currently supported are label-based queries for
916 * permissions or data.
918 * For permissions queries, ubuf must begin with "label\0", followed by the
919 * profile query specific format described in the query_label() function
922 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
923 * <LABEL> is the name of the security confinement context and <KEY> is the
924 * name of the data to retrieve.
926 * Returns: number of bytes written or -errno on failure
928 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
929 size_t count, loff_t *ppos)
931 struct multi_transaction *t;
937 t = multi_transaction_new(file, ubuf, count);
941 if (count > QUERY_CMD_PROFILE_LEN &&
942 !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
943 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
944 t->data + QUERY_CMD_PROFILE_LEN,
945 count - QUERY_CMD_PROFILE_LEN, true);
946 } else if (count > QUERY_CMD_LABEL_LEN &&
947 !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
948 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
949 t->data + QUERY_CMD_LABEL_LEN,
950 count - QUERY_CMD_LABEL_LEN, true);
951 } else if (count > QUERY_CMD_LABELALL_LEN &&
952 !memcmp(t->data, QUERY_CMD_LABELALL,
953 QUERY_CMD_LABELALL_LEN)) {
954 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
955 t->data + QUERY_CMD_LABELALL_LEN,
956 count - QUERY_CMD_LABELALL_LEN, false);
957 } else if (count > QUERY_CMD_DATA_LEN &&
958 !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
959 len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
960 t->data + QUERY_CMD_DATA_LEN,
961 count - QUERY_CMD_DATA_LEN);
966 put_multi_transaction(t);
970 multi_transaction_set(file, t, len);
975 static const struct file_operations aa_sfs_access = {
976 .write = aa_write_access,
977 .read = multi_transaction_read,
978 .release = multi_transaction_release,
979 .llseek = generic_file_llseek,
982 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
984 struct aa_sfs_entry *fs_file = seq->private;
989 switch (fs_file->v_type) {
990 case AA_SFS_TYPE_BOOLEAN:
991 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
993 case AA_SFS_TYPE_STRING:
994 seq_printf(seq, "%s\n", fs_file->v.string);
996 case AA_SFS_TYPE_U64:
997 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1000 /* Ignore unpritable entry types. */
1007 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1009 return single_open(file, aa_sfs_seq_show, inode->i_private);
1012 const struct file_operations aa_sfs_seq_file_ops = {
1013 .owner = THIS_MODULE,
1014 .open = aa_sfs_seq_open,
1016 .llseek = seq_lseek,
1017 .release = single_release,
1021 * profile based file operations
1022 * policy/profiles/XXXX/profiles/ *
1025 #define SEQ_PROFILE_FOPS(NAME) \
1026 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1028 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1031 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1032 .owner = THIS_MODULE, \
1033 .open = seq_profile_ ##NAME ##_open, \
1035 .llseek = seq_lseek, \
1036 .release = seq_profile_release, \
1039 static int seq_profile_open(struct inode *inode, struct file *file,
1040 int (*show)(struct seq_file *, void *))
1042 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1043 int error = single_open(file, show, proxy);
1046 file->private_data = NULL;
1047 aa_put_proxy(proxy);
1053 static int seq_profile_release(struct inode *inode, struct file *file)
1055 struct seq_file *seq = (struct seq_file *) file->private_data;
1057 aa_put_proxy(seq->private);
1058 return single_release(inode, file);
1061 static int seq_profile_name_show(struct seq_file *seq, void *v)
1063 struct aa_proxy *proxy = seq->private;
1064 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1065 struct aa_profile *profile = labels_profile(label);
1066 seq_printf(seq, "%s\n", profile->base.name);
1067 aa_put_label(label);
1072 static int seq_profile_mode_show(struct seq_file *seq, void *v)
1074 struct aa_proxy *proxy = seq->private;
1075 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1076 struct aa_profile *profile = labels_profile(label);
1077 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1078 aa_put_label(label);
1083 static int seq_profile_attach_show(struct seq_file *seq, void *v)
1085 struct aa_proxy *proxy = seq->private;
1086 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1087 struct aa_profile *profile = labels_profile(label);
1088 if (profile->attach)
1089 seq_printf(seq, "%s\n", profile->attach);
1090 else if (profile->xmatch)
1091 seq_puts(seq, "<unknown>\n");
1093 seq_printf(seq, "%s\n", profile->base.name);
1094 aa_put_label(label);
1099 static int seq_profile_hash_show(struct seq_file *seq, void *v)
1101 struct aa_proxy *proxy = seq->private;
1102 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1103 struct aa_profile *profile = labels_profile(label);
1104 unsigned int i, size = aa_hash_size();
1106 if (profile->hash) {
1107 for (i = 0; i < size; i++)
1108 seq_printf(seq, "%.2x", profile->hash[i]);
1109 seq_putc(seq, '\n');
1111 aa_put_label(label);
1116 SEQ_PROFILE_FOPS(name);
1117 SEQ_PROFILE_FOPS(mode);
1118 SEQ_PROFILE_FOPS(attach);
1119 SEQ_PROFILE_FOPS(hash);
1122 * namespace based files
1123 * several root files and
1127 #define SEQ_NS_FOPS(NAME) \
1128 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1130 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1133 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1134 .owner = THIS_MODULE, \
1135 .open = seq_ns_ ##NAME ##_open, \
1137 .llseek = seq_lseek, \
1138 .release = single_release, \
1141 static int seq_ns_level_show(struct seq_file *seq, void *v)
1143 struct aa_label *label;
1145 label = begin_current_label_crit_section();
1146 seq_printf(seq, "%d\n", labels_ns(label)->level);
1147 end_current_label_crit_section(label);
1152 static int seq_ns_name_show(struct seq_file *seq, void *v)
1154 struct aa_label *label = begin_current_label_crit_section();
1156 seq_printf(seq, "%s\n", aa_ns_name(labels_ns(label),
1157 labels_ns(label), true));
1158 end_current_label_crit_section(label);
1167 /* policy/raw_data/ * file ops */
1169 #define SEQ_RAWDATA_FOPS(NAME) \
1170 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1172 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1175 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1176 .owner = THIS_MODULE, \
1177 .open = seq_rawdata_ ##NAME ##_open, \
1179 .llseek = seq_lseek, \
1180 .release = seq_rawdata_release, \
1183 static int seq_rawdata_open(struct inode *inode, struct file *file,
1184 int (*show)(struct seq_file *, void *))
1186 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1190 /* lost race this ent is being reaped */
1193 error = single_open(file, show, data);
1195 AA_BUG(file->private_data &&
1196 ((struct seq_file *)file->private_data)->private);
1197 aa_put_loaddata(data);
1203 static int seq_rawdata_release(struct inode *inode, struct file *file)
1205 struct seq_file *seq = (struct seq_file *) file->private_data;
1208 aa_put_loaddata(seq->private);
1210 return single_release(inode, file);
1213 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1215 struct aa_loaddata *data = seq->private;
1217 seq_printf(seq, "v%d\n", data->abi);
1222 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1224 struct aa_loaddata *data = seq->private;
1226 seq_printf(seq, "%ld\n", data->revision);
1231 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1233 struct aa_loaddata *data = seq->private;
1234 unsigned int i, size = aa_hash_size();
1237 for (i = 0; i < size; i++)
1238 seq_printf(seq, "%.2x", data->hash[i]);
1239 seq_putc(seq, '\n');
1245 SEQ_RAWDATA_FOPS(abi);
1246 SEQ_RAWDATA_FOPS(revision);
1247 SEQ_RAWDATA_FOPS(hash);
1249 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1252 struct aa_loaddata *rawdata = file->private_data;
1254 return simple_read_from_buffer(buf, size, ppos, rawdata->data,
1258 static int rawdata_release(struct inode *inode, struct file *file)
1260 aa_put_loaddata(file->private_data);
1265 static int rawdata_open(struct inode *inode, struct file *file)
1267 if (!policy_view_capable(NULL))
1269 file->private_data = __aa_get_loaddata(inode->i_private);
1270 if (!file->private_data)
1271 /* lost race: this entry is being reaped */
1277 static const struct file_operations rawdata_fops = {
1278 .open = rawdata_open,
1279 .read = rawdata_read,
1280 .llseek = generic_file_llseek,
1281 .release = rawdata_release,
1284 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1288 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1289 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1290 /* no refcounts on i_private */
1291 aafs_remove(rawdata->dents[i]);
1292 rawdata->dents[i] = NULL;
1297 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1299 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1302 remove_rawdata_dents(rawdata);
1303 list_del_init(&rawdata->list);
1304 aa_put_ns(rawdata->ns);
1309 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1311 struct dentry *dent, *dir;
1315 AA_BUG(!mutex_is_locked(&ns->lock));
1316 AA_BUG(!ns_subdata_dir(ns));
1319 * just use ns revision dir was originally created at. This is
1320 * under ns->lock and if load is successful revision will be
1321 * bumped and is guaranteed to be unique
1323 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1327 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1329 /* ->name freed when rawdata freed */
1330 return PTR_ERR(dir);
1331 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1333 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1334 &seq_rawdata_abi_fops);
1337 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1339 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1340 &seq_rawdata_revision_fops);
1343 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1345 if (aa_g_hash_policy) {
1346 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1347 rawdata, &seq_rawdata_hash_fops);
1350 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1353 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1354 dir, rawdata, &rawdata_fops);
1357 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1358 d_inode(dent)->i_size = rawdata->size;
1360 rawdata->ns = aa_get_ns(ns);
1361 list_add(&rawdata->list, &ns->rawdata_list);
1362 /* no refcount on inode rawdata */
1367 remove_rawdata_dents(rawdata);
1369 return PTR_ERR(dent);
1372 /** fns to setup dynamic per profile/namespace files **/
1376 * Requires: @profile->ns->lock held
1378 void __aafs_profile_rmdir(struct aa_profile *profile)
1380 struct aa_profile *child;
1386 list_for_each_entry(child, &profile->base.profiles, base.list)
1387 __aafs_profile_rmdir(child);
1389 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1390 struct aa_proxy *proxy;
1391 if (!profile->dents[i])
1394 proxy = d_inode(profile->dents[i])->i_private;
1395 aafs_remove(profile->dents[i]);
1396 aa_put_proxy(proxy);
1397 profile->dents[i] = NULL;
1403 * Requires: @old->ns->lock held
1405 void __aafs_profile_migrate_dents(struct aa_profile *old,
1406 struct aa_profile *new)
1410 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1411 new->dents[i] = old->dents[i];
1413 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
1414 old->dents[i] = NULL;
1418 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1419 struct aa_profile *profile,
1420 const struct file_operations *fops)
1422 struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1423 struct dentry *dent;
1425 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1427 aa_put_proxy(proxy);
1432 static int profile_depth(struct aa_profile *profile)
1437 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1444 static int gen_symlink_name(char *buffer, size_t bsize, int depth,
1445 const char *dirname, const char *fname)
1449 for (; depth > 0; depth--) {
1451 return -ENAMETOOLONG;
1452 strcpy(buffer, "../../");
1457 error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname);
1458 if (error >= bsize || error < 0)
1459 return -ENAMETOOLONG;
1465 * Requires: @profile->ns->lock held
1467 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1469 struct aa_profile *child;
1470 struct dentry *dent = NULL, *dir;
1474 struct aa_profile *p;
1475 p = aa_deref_parent(profile);
1477 /* adding to parent that previously didn't have children */
1478 dent = aafs_create_dir("profiles", dent);
1481 prof_child_dir(p) = parent = dent;
1484 if (!profile->dirname) {
1486 len = mangle_name(profile->base.name, NULL);
1487 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1489 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1490 if (!profile->dirname) {
1495 mangle_name(profile->base.name, profile->dirname);
1496 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1499 dent = aafs_create_dir(profile->dirname, parent);
1502 prof_dir(profile) = dir = dent;
1504 dent = create_profile_file(dir, "name", profile,
1505 &seq_profile_name_fops);
1508 profile->dents[AAFS_PROF_NAME] = dent;
1510 dent = create_profile_file(dir, "mode", profile,
1511 &seq_profile_mode_fops);
1514 profile->dents[AAFS_PROF_MODE] = dent;
1516 dent = create_profile_file(dir, "attach", profile,
1517 &seq_profile_attach_fops);
1520 profile->dents[AAFS_PROF_ATTACH] = dent;
1522 if (profile->hash) {
1523 dent = create_profile_file(dir, "sha1", profile,
1524 &seq_profile_hash_fops);
1527 profile->dents[AAFS_PROF_HASH] = dent;
1530 if (profile->rawdata) {
1532 int depth = profile_depth(profile);
1534 error = gen_symlink_name(target, sizeof(target), depth,
1535 profile->rawdata->name, "sha1");
1538 dent = aafs_create_symlink("raw_sha1", dir, target, NULL);
1541 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1543 error = gen_symlink_name(target, sizeof(target), depth,
1544 profile->rawdata->name, "abi");
1547 dent = aafs_create_symlink("raw_abi", dir, target, NULL);
1550 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1552 error = gen_symlink_name(target, sizeof(target), depth,
1553 profile->rawdata->name, "raw_data");
1556 dent = aafs_create_symlink("raw_data", dir, target, NULL);
1559 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1562 list_for_each_entry(child, &profile->base.profiles, base.list) {
1563 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1571 error = PTR_ERR(dent);
1574 __aafs_profile_rmdir(profile);
1579 static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
1581 struct aa_ns *ns, *parent;
1582 /* TODO: improve permission check */
1583 struct aa_label *label;
1586 label = begin_current_label_crit_section();
1587 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1588 end_current_label_crit_section(label);
1592 parent = aa_get_ns(dir->i_private);
1593 AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1595 /* we have to unlock and then relock to get locking order right
1599 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1600 mutex_lock(&parent->lock);
1601 inode_lock_nested(dir, I_MUTEX_PARENT);
1605 error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
1610 ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1613 error = PTR_ERR(ns);
1617 aa_put_ns(ns); /* list ref remains */
1620 simple_release_fs(&aafs_mnt, &aafs_count);
1622 mutex_unlock(&parent->lock);
1628 static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1630 struct aa_ns *ns, *parent;
1631 /* TODO: improve permission check */
1632 struct aa_label *label;
1635 label = begin_current_label_crit_section();
1636 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1637 end_current_label_crit_section(label);
1641 parent = aa_get_ns(dir->i_private);
1642 /* rmdir calls the generic securityfs functions to remove files
1643 * from the apparmor dir. It is up to the apparmor ns locking
1647 inode_unlock(dentry->d_inode);
1649 mutex_lock(&parent->lock);
1650 ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1651 dentry->d_name.len));
1656 AA_BUG(ns_dir(ns) != dentry);
1662 mutex_unlock(&parent->lock);
1663 inode_lock_nested(dir, I_MUTEX_PARENT);
1664 inode_lock(dentry->d_inode);
1670 static const struct inode_operations ns_dir_inode_operations = {
1671 .lookup = simple_lookup,
1672 .mkdir = ns_mkdir_op,
1673 .rmdir = ns_rmdir_op,
1676 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1678 struct aa_loaddata *ent, *tmp;
1680 AA_BUG(!mutex_is_locked(&ns->lock));
1682 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1683 __aa_fs_remove_rawdata(ent);
1688 * Requires: @ns->lock held
1690 void __aafs_ns_rmdir(struct aa_ns *ns)
1693 struct aa_profile *child;
1699 list_for_each_entry(child, &ns->base.profiles, base.list)
1700 __aafs_profile_rmdir(child);
1702 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1703 mutex_lock(&sub->lock);
1704 __aafs_ns_rmdir(sub);
1705 mutex_unlock(&sub->lock);
1708 __aa_fs_list_remove_rawdata(ns);
1710 if (ns_subns_dir(ns)) {
1711 sub = d_inode(ns_subns_dir(ns))->i_private;
1714 if (ns_subload(ns)) {
1715 sub = d_inode(ns_subload(ns))->i_private;
1718 if (ns_subreplace(ns)) {
1719 sub = d_inode(ns_subreplace(ns))->i_private;
1722 if (ns_subremove(ns)) {
1723 sub = d_inode(ns_subremove(ns))->i_private;
1726 if (ns_subrevision(ns)) {
1727 sub = d_inode(ns_subrevision(ns))->i_private;
1731 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1732 aafs_remove(ns->dents[i]);
1733 ns->dents[i] = NULL;
1737 /* assumes cleanup in caller */
1738 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1740 struct dentry *dent;
1745 dent = aafs_create_dir("profiles", dir);
1747 return PTR_ERR(dent);
1748 ns_subprofs_dir(ns) = dent;
1750 dent = aafs_create_dir("raw_data", dir);
1752 return PTR_ERR(dent);
1753 ns_subdata_dir(ns) = dent;
1755 dent = aafs_create_file("revision", 0444, dir, ns,
1756 &aa_fs_ns_revision_fops);
1758 return PTR_ERR(dent);
1760 ns_subrevision(ns) = dent;
1762 dent = aafs_create_file(".load", 0640, dir, ns,
1763 &aa_fs_profile_load);
1765 return PTR_ERR(dent);
1767 ns_subload(ns) = dent;
1769 dent = aafs_create_file(".replace", 0640, dir, ns,
1770 &aa_fs_profile_replace);
1772 return PTR_ERR(dent);
1774 ns_subreplace(ns) = dent;
1776 dent = aafs_create_file(".remove", 0640, dir, ns,
1777 &aa_fs_profile_remove);
1779 return PTR_ERR(dent);
1781 ns_subremove(ns) = dent;
1783 /* use create_dentry so we can supply private data */
1784 dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
1785 &ns_dir_inode_operations);
1787 return PTR_ERR(dent);
1789 ns_subns_dir(ns) = dent;
1795 * Requires: @ns->lock held
1797 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
1798 struct dentry *dent)
1801 struct aa_profile *child;
1807 AA_BUG(!mutex_is_locked(&ns->lock));
1810 name = ns->base.name;
1813 /* create ns dir if it doesn't already exist */
1814 dent = aafs_create_dir(name, parent);
1819 ns_dir(ns) = dir = dent;
1820 error = __aafs_ns_mkdir_entries(ns, dir);
1825 list_for_each_entry(child, &ns->base.profiles, base.list) {
1826 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
1832 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1833 mutex_lock(&sub->lock);
1834 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
1835 mutex_unlock(&sub->lock);
1843 error = PTR_ERR(dent);
1846 __aafs_ns_rmdir(ns);
1852 #define list_entry_is_head(pos, head, member) (&pos->member == (head))
1855 * __next_ns - find the next namespace to list
1856 * @root: root namespace to stop search at (NOT NULL)
1857 * @ns: current ns position (NOT NULL)
1859 * Find the next namespace from @ns under @root and handle all locking needed
1860 * while switching current namespace.
1862 * Returns: next namespace or NULL if at last namespace under @root
1863 * Requires: ns->parent->lock to be held
1864 * NOTE: will not unlock root->lock
1866 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
1868 struct aa_ns *parent, *next;
1870 /* is next namespace a child */
1871 if (!list_empty(&ns->sub_ns)) {
1872 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
1873 mutex_lock(&next->lock);
1877 /* check if the next ns is a sibling, parent, gp, .. */
1878 parent = ns->parent;
1879 while (ns != root) {
1880 mutex_unlock(&ns->lock);
1881 next = list_next_entry(ns, base.list);
1882 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
1883 mutex_lock(&next->lock);
1887 parent = parent->parent;
1894 * __first_profile - find the first profile in a namespace
1895 * @root: namespace that is root of profiles being displayed (NOT NULL)
1896 * @ns: namespace to start in (NOT NULL)
1898 * Returns: unrefcounted profile or NULL if no profile
1899 * Requires: profile->ns.lock to be held
1901 static struct aa_profile *__first_profile(struct aa_ns *root,
1904 for (; ns; ns = __next_ns(root, ns)) {
1905 if (!list_empty(&ns->base.profiles))
1906 return list_first_entry(&ns->base.profiles,
1907 struct aa_profile, base.list);
1913 * __next_profile - step to the next profile in a profile tree
1914 * @profile: current profile in tree (NOT NULL)
1916 * Perform a depth first traversal on the profile tree in a namespace
1918 * Returns: next profile or NULL if done
1919 * Requires: profile->ns.lock to be held
1921 static struct aa_profile *__next_profile(struct aa_profile *p)
1923 struct aa_profile *parent;
1924 struct aa_ns *ns = p->ns;
1926 /* is next profile a child */
1927 if (!list_empty(&p->base.profiles))
1928 return list_first_entry(&p->base.profiles, typeof(*p),
1931 /* is next profile a sibling, parent sibling, gp, sibling, .. */
1932 parent = rcu_dereference_protected(p->parent,
1933 mutex_is_locked(&p->ns->lock));
1935 p = list_next_entry(p, base.list);
1936 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
1939 parent = rcu_dereference_protected(parent->parent,
1940 mutex_is_locked(&parent->ns->lock));
1943 /* is next another profile in the namespace */
1944 p = list_next_entry(p, base.list);
1945 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
1952 * next_profile - step to the next profile in where ever it may be
1953 * @root: root namespace (NOT NULL)
1954 * @profile: current profile (NOT NULL)
1956 * Returns: next profile or NULL if there isn't one
1958 static struct aa_profile *next_profile(struct aa_ns *root,
1959 struct aa_profile *profile)
1961 struct aa_profile *next = __next_profile(profile);
1965 /* finished all profiles in namespace move to next namespace */
1966 return __first_profile(root, __next_ns(root, profile->ns));
1970 * p_start - start a depth first traversal of profile tree
1971 * @f: seq_file to fill
1972 * @pos: current position
1974 * Returns: first profile under current namespace or NULL if none found
1976 * acquires first ns->lock
1978 static void *p_start(struct seq_file *f, loff_t *pos)
1980 struct aa_profile *profile = NULL;
1981 struct aa_ns *root = aa_get_current_ns();
1985 /* find the first profile */
1986 mutex_lock(&root->lock);
1987 profile = __first_profile(root, root);
1989 /* skip to position */
1990 for (; profile && l > 0; l--)
1991 profile = next_profile(root, profile);
1997 * p_next - read the next profile entry
1998 * @f: seq_file to fill
1999 * @p: profile previously returned
2000 * @pos: current position
2002 * Returns: next profile after @p or NULL if none
2004 * may acquire/release locks in namespace tree as necessary
2006 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2008 struct aa_profile *profile = p;
2009 struct aa_ns *ns = f->private;
2012 return next_profile(ns, profile);
2016 * p_stop - stop depth first traversal
2017 * @f: seq_file we are filling
2018 * @p: the last profile writen
2020 * Release all locking done by p_start/p_next on namespace tree
2022 static void p_stop(struct seq_file *f, void *p)
2024 struct aa_profile *profile = p;
2025 struct aa_ns *root = f->private, *ns;
2028 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2029 mutex_unlock(&ns->lock);
2031 mutex_unlock(&root->lock);
2036 * seq_show_profile - show a profile entry
2037 * @f: seq_file to file
2038 * @p: current position (profile) (NOT NULL)
2040 * Returns: error on failure
2042 static int seq_show_profile(struct seq_file *f, void *p)
2044 struct aa_profile *profile = (struct aa_profile *)p;
2045 struct aa_ns *root = f->private;
2047 aa_label_seq_xprint(f, root, &profile->label,
2048 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2054 static const struct seq_operations aa_sfs_profiles_op = {
2058 .show = seq_show_profile,
2061 static int profiles_open(struct inode *inode, struct file *file)
2063 if (!policy_view_capable(NULL))
2066 return seq_open(file, &aa_sfs_profiles_op);
2069 static int profiles_release(struct inode *inode, struct file *file)
2071 return seq_release(inode, file);
2074 static const struct file_operations aa_sfs_profiles_fops = {
2075 .open = profiles_open,
2077 .llseek = seq_lseek,
2078 .release = profiles_release,
2082 /** Base file system setup **/
2083 static struct aa_sfs_entry aa_sfs_entry_file[] = {
2084 AA_SFS_FILE_STRING("mask",
2085 "create read write exec append mmap_exec link lock"),
2089 static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2090 AA_SFS_FILE_STRING("mask", "read trace"),
2094 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2095 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2096 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2097 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2098 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2099 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2100 AA_SFS_FILE_STRING("version", "1.2"),
2104 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2105 AA_SFS_FILE_BOOLEAN("v5", 1),
2109 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2110 AA_SFS_DIR("versions", aa_sfs_entry_versions),
2111 AA_SFS_FILE_BOOLEAN("set_load", 1),
2115 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2116 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2117 AA_SFS_FILE_BOOLEAN("data", 1),
2118 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2122 static struct aa_sfs_entry aa_sfs_entry_query[] = {
2123 AA_SFS_DIR("label", aa_sfs_entry_query_label),
2126 static struct aa_sfs_entry aa_sfs_entry_features[] = {
2127 AA_SFS_DIR("policy", aa_sfs_entry_policy),
2128 AA_SFS_DIR("domain", aa_sfs_entry_domain),
2129 AA_SFS_DIR("file", aa_sfs_entry_file),
2130 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
2131 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
2132 AA_SFS_DIR("caps", aa_sfs_entry_caps),
2133 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
2134 AA_SFS_DIR("query", aa_sfs_entry_query),
2138 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2139 AA_SFS_FILE_FOPS(".access", 0640, &aa_sfs_access),
2140 AA_SFS_FILE_FOPS(".ns_level", 0666, &seq_ns_level_fops),
2141 AA_SFS_FILE_FOPS(".ns_name", 0640, &seq_ns_name_fops),
2142 AA_SFS_FILE_FOPS("profiles", 0440, &aa_sfs_profiles_fops),
2143 AA_SFS_DIR("features", aa_sfs_entry_features),
2147 static struct aa_sfs_entry aa_sfs_entry =
2148 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2151 * entry_create_file - create a file entry in the apparmor securityfs
2152 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2153 * @parent: the parent dentry in the securityfs
2155 * Use entry_remove_file to remove entries created with this fn.
2157 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2158 struct dentry *parent)
2162 fs_file->dentry = securityfs_create_file(fs_file->name,
2163 S_IFREG | fs_file->mode,
2166 if (IS_ERR(fs_file->dentry)) {
2167 error = PTR_ERR(fs_file->dentry);
2168 fs_file->dentry = NULL;
2173 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2175 * entry_create_dir - recursively create a directory entry in the securityfs
2176 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2177 * @parent: the parent dentry in the securityfs
2179 * Use entry_remove_dir to remove entries created with this fn.
2181 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2182 struct dentry *parent)
2184 struct aa_sfs_entry *fs_file;
2188 dir = securityfs_create_dir(fs_dir->name, parent);
2190 return PTR_ERR(dir);
2191 fs_dir->dentry = dir;
2193 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2194 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2195 error = entry_create_dir(fs_file, fs_dir->dentry);
2197 error = entry_create_file(fs_file, fs_dir->dentry);
2205 entry_remove_dir(fs_dir);
2211 * entry_remove_file - drop a single file entry in the apparmor securityfs
2212 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2214 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2216 if (!fs_file->dentry)
2219 securityfs_remove(fs_file->dentry);
2220 fs_file->dentry = NULL;
2224 * entry_remove_dir - recursively drop a directory entry from the securityfs
2225 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2227 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2229 struct aa_sfs_entry *fs_file;
2231 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2232 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2233 entry_remove_dir(fs_file);
2235 entry_remove_file(fs_file);
2238 entry_remove_file(fs_dir);
2242 * aa_destroy_aafs - cleanup and free aafs
2244 * releases dentries allocated by aa_create_aafs
2246 void __init aa_destroy_aafs(void)
2248 entry_remove_dir(&aa_sfs_entry);
2252 #define NULL_FILE_NAME ".null"
2253 struct path aa_null;
2255 static int aa_mk_null_file(struct dentry *parent)
2257 struct vfsmount *mount = NULL;
2258 struct dentry *dentry;
2259 struct inode *inode;
2261 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2266 inode_lock(d_inode(parent));
2267 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2268 if (IS_ERR(dentry)) {
2269 error = PTR_ERR(dentry);
2272 inode = new_inode(parent->d_inode->i_sb);
2278 inode->i_ino = get_next_ino();
2279 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2280 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
2281 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2282 MKDEV(MEM_MAJOR, 3));
2283 d_instantiate(dentry, inode);
2284 aa_null.dentry = dget(dentry);
2285 aa_null.mnt = mntget(mount);
2292 inode_unlock(d_inode(parent));
2293 simple_release_fs(&mount, &count);
2299 static const char *policy_get_link(struct dentry *dentry,
2300 struct inode *inode,
2301 struct delayed_call *done)
2307 return ERR_PTR(-ECHILD);
2308 ns = aa_get_current_ns();
2309 path.mnt = mntget(aafs_mnt);
2310 path.dentry = dget(ns_dir(ns));
2311 nd_jump_link(&path);
2317 static int ns_get_name(char *buf, size_t size, struct aa_ns *ns,
2318 struct inode *inode)
2320 int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino);
2322 if (res < 0 || res >= size)
2328 static int policy_readlink(struct dentry *dentry, char __user *buffer,
2335 ns = aa_get_current_ns();
2336 res = ns_get_name(name, sizeof(name), ns, d_inode(dentry));
2338 res = readlink_copy(buffer, buflen, name);
2344 static const struct inode_operations policy_link_iops = {
2345 .readlink = policy_readlink,
2346 .get_link = policy_get_link,
2351 * aa_create_aafs - create the apparmor security filesystem
2353 * dentries created here are released by aa_destroy_aafs
2355 * Returns: error on failure
2357 static int __init aa_create_aafs(void)
2359 struct dentry *dent;
2362 if (!apparmor_initialized)
2365 if (aa_sfs_entry.dentry) {
2366 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2370 /* setup apparmorfs used to virtualize policy/ */
2371 aafs_mnt = kern_mount(&aafs_ops);
2372 if (IS_ERR(aafs_mnt))
2373 panic("can't set apparmorfs up\n");
2374 aafs_mnt->mnt_sb->s_flags &= ~MS_NOUSER;
2376 /* Populate fs tree. */
2377 error = entry_create_dir(&aa_sfs_entry, NULL);
2381 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2382 NULL, &aa_fs_profile_load);
2384 error = PTR_ERR(dent);
2387 ns_subload(root_ns) = dent;
2389 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2390 NULL, &aa_fs_profile_replace);
2392 error = PTR_ERR(dent);
2395 ns_subreplace(root_ns) = dent;
2397 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2398 NULL, &aa_fs_profile_remove);
2400 error = PTR_ERR(dent);
2403 ns_subremove(root_ns) = dent;
2405 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2406 NULL, &aa_fs_ns_revision_fops);
2408 error = PTR_ERR(dent);
2411 ns_subrevision(root_ns) = dent;
2413 /* policy tree referenced by magic policy symlink */
2414 mutex_lock(&root_ns->lock);
2415 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2416 aafs_mnt->mnt_root);
2417 mutex_unlock(&root_ns->lock);
2421 /* magic symlink similar to nsfs redirects based on task policy */
2422 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2423 NULL, &policy_link_iops);
2425 error = PTR_ERR(dent);
2429 error = aa_mk_null_file(aa_sfs_entry.dentry);
2433 /* TODO: add default profile to apparmorfs */
2435 /* Report that AppArmor fs is enabled */
2436 aa_info_message("AppArmor Filesystem Enabled");
2441 AA_ERROR("Error creating AppArmor securityfs\n");
2445 fs_initcall(aa_create_aafs);