2 * AppArmor security module
4 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
15 #include <linux/ctype.h>
16 #include <linux/security.h>
17 #include <linux/vmalloc.h>
18 #include <linux/module.h>
19 #include <linux/seq_file.h>
20 #include <linux/uaccess.h>
21 #include <linux/mount.h>
22 #include <linux/namei.h>
23 #include <linux/capability.h>
24 #include <linux/rcupdate.h>
26 #include <linux/poll.h>
27 #include <uapi/linux/major.h>
28 #include <uapi/linux/magic.h>
30 #include "include/apparmor.h"
31 #include "include/apparmorfs.h"
32 #include "include/audit.h"
33 #include "include/context.h"
34 #include "include/crypto.h"
35 #include "include/ipc.h"
36 #include "include/policy_ns.h"
37 #include "include/label.h"
38 #include "include/policy.h"
39 #include "include/policy_ns.h"
40 #include "include/resource.h"
41 #include "include/policy_unpack.h"
44 * The apparmor filesystem interface used for policy load and introspection
45 * The interface is split into two main components based on their function
46 * a securityfs component:
47 * used for static files that are always available, and which allows
48 * userspace to specificy the location of the security filesystem.
50 * fns and data are prefixed with
53 * an apparmorfs component:
54 * used loaded policy content and introspection. It is not part of a
55 * regular mounted filesystem and is available only through the magic
56 * policy symlink in the root of the securityfs apparmor/ directory.
57 * Tasks queries will be magically redirected to the correct portion
58 * of the policy tree based on their confinement.
60 * fns and data are prefixed with
63 * The aa_fs_ prefix is used to indicate the fn is used by both the
64 * securityfs and apparmorfs filesystems.
73 * aa_mangle_name - mangle a profile name to std profile layout form
74 * @name: profile name to mangle (NOT NULL)
75 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
77 * Returns: length of mangled name
79 static int mangle_name(const char *name, char *target)
83 while (*name == '/' || *name == '.')
87 for (; *name; name++) {
90 else if (isspace(*name))
92 else if (isalnum(*name) || strchr("._-", *name))
99 for (; *name; name++) {
100 if (isalnum(*name) || isspace(*name) ||
101 strchr("/._-", *name))
113 * aafs - core fns and data for the policy tree
116 #define AAFS_NAME "apparmorfs"
117 static struct vfsmount *aafs_mnt;
118 static int aafs_count;
121 static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
123 struct inode *inode = d_inode(dentry);
125 seq_printf(seq, "%s:[%lu]", AAFS_NAME, inode->i_ino);
129 static void aafs_i_callback(struct rcu_head *head)
131 struct inode *inode = container_of(head, struct inode, i_rcu);
132 if (S_ISLNK(inode->i_mode))
133 kfree(inode->i_link);
134 free_inode_nonrcu(inode);
137 static void aafs_destroy_inode(struct inode *inode)
139 call_rcu(&inode->i_rcu, aafs_i_callback);
142 static const struct super_operations aafs_super_ops = {
143 .statfs = simple_statfs,
144 .destroy_inode = aafs_destroy_inode,
145 .show_path = aafs_show_path,
148 static int fill_super(struct super_block *sb, void *data, int silent)
150 static struct tree_descr files[] = { {""} };
153 error = simple_fill_super(sb, AAFS_MAGIC, files);
156 sb->s_op = &aafs_super_ops;
161 static struct dentry *aafs_mount(struct file_system_type *fs_type,
162 int flags, const char *dev_name, void *data)
164 return mount_single(fs_type, flags, data, fill_super);
167 static struct file_system_type aafs_ops = {
168 .owner = THIS_MODULE,
171 .kill_sb = kill_anon_super,
175 * __aafs_setup_d_inode - basic inode setup for apparmorfs
176 * @dir: parent directory for the dentry
177 * @dentry: dentry we are seting the inode up for
178 * @mode: permissions the file should have
179 * @data: data to store on inode.i_private, available in open()
180 * @link: if symlink, symlink target string
181 * @fops: struct file_operations that should be used
182 * @iops: struct of inode_operations that should be used
184 static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
185 umode_t mode, void *data, char *link,
186 const struct file_operations *fops,
187 const struct inode_operations *iops)
189 struct inode *inode = new_inode(dir->i_sb);
197 inode->i_ino = get_next_ino();
198 inode->i_mode = mode;
199 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
200 inode->i_private = data;
202 inode->i_op = iops ? iops : &simple_dir_inode_operations;
203 inode->i_fop = &simple_dir_operations;
206 } else if (S_ISLNK(mode)) {
207 inode->i_op = iops ? iops : &simple_symlink_inode_operations;
208 inode->i_link = link;
212 d_instantiate(dentry, inode);
219 * aafs_create - create a dentry in the apparmorfs filesystem
221 * @name: name of dentry to create
222 * @mode: permissions the file should have
223 * @parent: parent directory for this dentry
224 * @data: data to store on inode.i_private, available in open()
225 * @link: if symlink, symlink target string
226 * @fops: struct file_operations that should be used for
227 * @iops: struct of inode_operations that should be used
229 * This is the basic "create a xxx" function for apparmorfs.
231 * Returns a pointer to a dentry if it succeeds, that must be free with
232 * aafs_remove(). Will return ERR_PTR on failure.
234 static struct dentry *aafs_create(const char *name, umode_t mode,
235 struct dentry *parent, void *data, void *link,
236 const struct file_operations *fops,
237 const struct inode_operations *iops)
239 struct dentry *dentry;
246 if (!(mode & S_IFMT))
247 mode = (mode & S_IALLUGO) | S_IFREG;
249 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
251 return ERR_PTR(error);
253 dir = d_inode(parent);
256 dentry = lookup_one_len(name, parent, strlen(name));
257 if (IS_ERR(dentry)) {
258 error = PTR_ERR(dentry);
262 if (d_really_is_positive(dentry)) {
267 error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
279 simple_release_fs(&aafs_mnt, &aafs_count);
281 return ERR_PTR(error);
285 * aafs_create_file - create a file in the apparmorfs filesystem
287 * @name: name of dentry to create
288 * @mode: permissions the file should have
289 * @parent: parent directory for this dentry
290 * @data: data to store on inode.i_private, available in open()
291 * @fops: struct file_operations that should be used for
295 static struct dentry *aafs_create_file(const char *name, umode_t mode,
296 struct dentry *parent, void *data,
297 const struct file_operations *fops)
299 return aafs_create(name, mode, parent, data, NULL, fops, NULL);
303 * aafs_create_dir - create a directory in the apparmorfs filesystem
305 * @name: name of dentry to create
306 * @parent: parent directory for this dentry
310 static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
312 return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
317 * aafs_create_symlink - create a symlink in the apparmorfs filesystem
318 * @name: name of dentry to create
319 * @parent: parent directory for this dentry
320 * @target: if symlink, symlink target string
321 * @iops: struct of inode_operations that should be used
323 * If @target parameter is %NULL, then the @iops parameter needs to be
324 * setup to handle .readlink and .get_link inode_operations.
326 static struct dentry *aafs_create_symlink(const char *name,
327 struct dentry *parent,
329 const struct inode_operations *iops)
335 link = kstrdup(target, GFP_KERNEL);
337 return ERR_PTR(-ENOMEM);
339 dent = aafs_create(name, S_IFLNK | 0444, parent, NULL, link, NULL,
348 * aafs_remove - removes a file or directory from the apparmorfs filesystem
350 * @dentry: dentry of the file/directory/symlink to removed.
352 static void aafs_remove(struct dentry *dentry)
356 if (!dentry || IS_ERR(dentry))
359 dir = d_inode(dentry->d_parent);
361 if (simple_positive(dentry)) {
362 if (d_is_dir(dentry))
363 simple_rmdir(dir, dentry);
365 simple_unlink(dir, dentry);
370 simple_release_fs(&aafs_mnt, &aafs_count);
375 * aa_fs - policy load/replace/remove
379 * aa_simple_write_to_buffer - common routine for getting policy from user
380 * @userbuf: user buffer to copy data from (NOT NULL)
381 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
382 * @copy_size: size of data to copy from user buffer
383 * @pos: position write is at in the file (NOT NULL)
385 * Returns: kernel buffer containing copy of user buffer data or an
386 * ERR_PTR on failure.
388 static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
393 struct aa_loaddata *data;
395 AA_BUG(copy_size > alloc_size);
398 /* only writes from pos 0, that is complete writes */
399 return ERR_PTR(-ESPIPE);
401 /* freed by caller to simple_write_to_buffer */
402 data = aa_loaddata_alloc(alloc_size);
406 data->size = copy_size;
407 if (copy_from_user(data->data, userbuf, copy_size)) {
409 return ERR_PTR(-EFAULT);
415 static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
416 loff_t *pos, struct aa_ns *ns)
418 struct aa_loaddata *data;
419 struct aa_label *label;
422 label = begin_current_label_crit_section();
424 /* high level check about policy management - fine grained in
427 error = aa_may_manage_policy(label, ns, mask);
431 data = aa_simple_write_to_buffer(buf, size, size, pos);
432 error = PTR_ERR(data);
434 error = aa_replace_profiles(ns, label, mask, data);
435 aa_put_loaddata(data);
438 end_current_label_crit_section(label);
443 /* .load file hook fn to load policy */
444 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
447 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
448 int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
455 static const struct file_operations aa_fs_profile_load = {
456 .write = profile_load,
457 .llseek = default_llseek,
460 /* .replace file hook fn to load and/or replace policy */
461 static ssize_t profile_replace(struct file *f, const char __user *buf,
462 size_t size, loff_t *pos)
464 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
465 int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
472 static const struct file_operations aa_fs_profile_replace = {
473 .write = profile_replace,
474 .llseek = default_llseek,
477 /* .remove file hook fn to remove loaded policy */
478 static ssize_t profile_remove(struct file *f, const char __user *buf,
479 size_t size, loff_t *pos)
481 struct aa_loaddata *data;
482 struct aa_label *label;
484 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
486 label = begin_current_label_crit_section();
487 /* high level check about policy management - fine grained in
490 error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY);
495 * aa_remove_profile needs a null terminated string so 1 extra
496 * byte is allocated and the copied data is null terminated.
498 data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
500 error = PTR_ERR(data);
502 data->data[size] = 0;
503 error = aa_remove_profiles(ns, label, data->data, size);
504 aa_put_loaddata(data);
507 end_current_label_crit_section(label);
512 static const struct file_operations aa_fs_profile_remove = {
513 .write = profile_remove,
514 .llseek = default_llseek,
522 /* revision file hook fn for policy loads */
523 static int ns_revision_release(struct inode *inode, struct file *file)
525 struct aa_revision *rev = file->private_data;
535 static ssize_t ns_revision_read(struct file *file, char __user *buf,
536 size_t size, loff_t *ppos)
538 struct aa_revision *rev = file->private_data;
543 mutex_lock(&rev->ns->lock);
544 last_read = rev->last_read;
545 if (last_read == rev->ns->revision) {
546 mutex_unlock(&rev->ns->lock);
547 if (file->f_flags & O_NONBLOCK)
549 if (wait_event_interruptible(rev->ns->wait,
551 READ_ONCE(rev->ns->revision)))
553 mutex_lock(&rev->ns->lock);
556 avail = sprintf(buffer, "%ld\n", rev->ns->revision);
557 if (*ppos + size > avail) {
558 rev->last_read = rev->ns->revision;
561 mutex_unlock(&rev->ns->lock);
563 return simple_read_from_buffer(buf, size, ppos, buffer, avail);
566 static int ns_revision_open(struct inode *inode, struct file *file)
568 struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
573 rev->ns = aa_get_ns(inode->i_private);
575 rev->ns = aa_get_current_ns();
576 file->private_data = rev;
581 static unsigned int ns_revision_poll(struct file *file, poll_table *pt)
583 struct aa_revision *rev = file->private_data;
584 unsigned int mask = 0;
587 mutex_lock(&rev->ns->lock);
588 poll_wait(file, &rev->ns->wait, pt);
589 if (rev->last_read < rev->ns->revision)
590 mask |= POLLIN | POLLRDNORM;
591 mutex_unlock(&rev->ns->lock);
597 void __aa_bump_ns_revision(struct aa_ns *ns)
600 wake_up_interruptible(&ns->wait);
603 static const struct file_operations aa_fs_ns_revision_fops = {
604 .owner = THIS_MODULE,
605 .open = ns_revision_open,
606 .poll = ns_revision_poll,
607 .read = ns_revision_read,
608 .llseek = generic_file_llseek,
609 .release = ns_revision_release,
612 static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
613 const char *match_str, size_t match_len)
617 unsigned int state = 0;
619 if (profile_unconfined(profile))
621 if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
622 dfa = profile->file.dfa;
623 state = aa_dfa_match_len(dfa, profile->file.start,
624 match_str + 1, match_len - 1);
627 struct path_cond cond = { };
629 tmp = aa_compute_fperms(dfa, state, &cond);
631 } else if (profile->policy.dfa) {
632 if (!PROFILE_MEDIATES_SAFE(profile, *match_str))
633 return; /* no change to current perms */
634 dfa = profile->policy.dfa;
635 state = aa_dfa_match_len(dfa, profile->policy.start[0],
636 match_str, match_len);
638 aa_compute_perms(dfa, state, &tmp);
642 aa_apply_modes_to_perms(profile, &tmp);
643 aa_perms_accum_raw(perms, &tmp);
648 * query_data - queries a policy and writes its data to buf
649 * @buf: the resulting data is stored here (NOT NULL)
650 * @buf_len: size of buf
651 * @query: query string used to retrieve data
652 * @query_len: size of query including second NUL byte
654 * The buffers pointed to by buf and query may overlap. The query buffer is
655 * parsed before buf is written to.
657 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
658 * the security confinement context and <KEY> is the name of the data to
659 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
661 * Don't expect the contents of buf to be preserved on failure.
663 * Returns: number of characters written to buf or -errno on failure
665 static ssize_t query_data(char *buf, size_t buf_len,
666 char *query, size_t query_len)
671 struct aa_label *label, *curr;
672 struct aa_profile *profile;
673 struct aa_data *data;
678 return -EINVAL; /* need a query */
680 key = query + strnlen(query, query_len) + 1;
681 if (key + 1 >= query + query_len)
682 return -EINVAL; /* not enough space for a non-empty key */
683 if (key + strnlen(key, query + query_len - key) >= query + query_len)
684 return -EINVAL; /* must end with NUL */
686 if (buf_len < sizeof(bytes) + sizeof(blocks))
687 return -EINVAL; /* not enough space */
689 curr = begin_current_label_crit_section();
690 label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
691 end_current_label_crit_section(curr);
693 return PTR_ERR(label);
695 /* We are going to leave space for two numbers. The first is the total
696 * number of bytes we are writing after the first number. This is so
697 * users can read the full output without reallocation.
699 * The second number is the number of data blocks we're writing. An
700 * application might be confined by multiple policies having data in
703 memset(buf, 0, sizeof(bytes) + sizeof(blocks));
704 out = buf + sizeof(bytes) + sizeof(blocks);
707 label_for_each_confined(i, label, profile) {
711 data = rhashtable_lookup_fast(profile->data, &key,
715 if (out + sizeof(outle32) + data->size > buf +
718 return -EINVAL; /* not enough space */
720 outle32 = __cpu_to_le32(data->size);
721 memcpy(out, &outle32, sizeof(outle32));
722 out += sizeof(outle32);
723 memcpy(out, data->data, data->size);
730 outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
731 memcpy(buf, &outle32, sizeof(outle32));
732 outle32 = __cpu_to_le32(blocks);
733 memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
739 * query_label - queries a label and writes permissions to buf
740 * @buf: the resulting permissions string is stored here (NOT NULL)
741 * @buf_len: size of buf
742 * @query: binary query string to match against the dfa
743 * @query_len: size of query
744 * @view_only: only compute for querier's view
746 * The buffers pointed to by buf and query may overlap. The query buffer is
747 * parsed before buf is written to.
749 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
750 * the name of the label, in the current namespace, that is to be queried and
751 * DFA_STRING is a binary string to match against the label(s)'s DFA.
753 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
754 * but must *not* be NUL terminated.
756 * Returns: number of characters written to buf or -errno on failure
758 static ssize_t query_label(char *buf, size_t buf_len,
759 char *query, size_t query_len, bool view_only)
761 struct aa_profile *profile;
762 struct aa_label *label, *curr;
763 char *label_name, *match_str;
764 size_t label_name_len, match_len;
765 struct aa_perms perms;
772 label_name_len = strnlen(query, query_len);
773 if (!label_name_len || label_name_len == query_len)
777 * The extra byte is to account for the null byte between the
778 * profile name and dfa string. profile_name_len is greater
779 * than zero and less than query_len, so a byte can be safely
780 * added or subtracted.
782 match_str = label_name + label_name_len + 1;
783 match_len = query_len - label_name_len - 1;
785 curr = begin_current_label_crit_section();
786 label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
787 end_current_label_crit_section(curr);
789 return PTR_ERR(label);
793 label_for_each_in_ns(i, labels_ns(label), label, profile) {
794 profile_query_cb(profile, &perms, match_str, match_len);
797 label_for_each(i, label, profile) {
798 profile_query_cb(profile, &perms, match_str, match_len);
803 return scnprintf(buf, buf_len,
804 "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
805 perms.allow, perms.deny, perms.audit, perms.quiet);
809 * Transaction based IO.
810 * The file expects a write which triggers the transaction, and then
811 * possibly a read(s) which collects the result - which is stored in a
812 * file-local buffer. Once a new write is performed, a new set of results
813 * are stored in the file-local buffer.
815 struct multi_transaction {
821 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
822 /* TODO: replace with per file lock */
823 static DEFINE_SPINLOCK(multi_transaction_lock);
825 static void multi_transaction_kref(struct kref *kref)
827 struct multi_transaction *t;
829 t = container_of(kref, struct multi_transaction, count);
830 free_page((unsigned long) t);
833 static struct multi_transaction *
834 get_multi_transaction(struct multi_transaction *t)
837 kref_get(&(t->count));
842 static void put_multi_transaction(struct multi_transaction *t)
845 kref_put(&(t->count), multi_transaction_kref);
848 /* does not increment @new's count */
849 static void multi_transaction_set(struct file *file,
850 struct multi_transaction *new, size_t n)
852 struct multi_transaction *old;
854 AA_BUG(n > MULTI_TRANSACTION_LIMIT);
857 spin_lock(&multi_transaction_lock);
858 old = (struct multi_transaction *) file->private_data;
859 file->private_data = new;
860 spin_unlock(&multi_transaction_lock);
861 put_multi_transaction(old);
864 static struct multi_transaction *multi_transaction_new(struct file *file,
865 const char __user *buf,
868 struct multi_transaction *t;
870 if (size > MULTI_TRANSACTION_LIMIT - 1)
871 return ERR_PTR(-EFBIG);
873 t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
875 return ERR_PTR(-ENOMEM);
876 kref_init(&t->count);
877 if (copy_from_user(t->data, buf, size)) {
878 put_multi_transaction(t);
879 return ERR_PTR(-EFAULT);
885 static ssize_t multi_transaction_read(struct file *file, char __user *buf,
886 size_t size, loff_t *pos)
888 struct multi_transaction *t;
891 spin_lock(&multi_transaction_lock);
892 t = get_multi_transaction(file->private_data);
893 spin_unlock(&multi_transaction_lock);
897 ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
898 put_multi_transaction(t);
903 static int multi_transaction_release(struct inode *inode, struct file *file)
905 put_multi_transaction(file->private_data);
910 #define QUERY_CMD_LABEL "label\0"
911 #define QUERY_CMD_LABEL_LEN 6
912 #define QUERY_CMD_PROFILE "profile\0"
913 #define QUERY_CMD_PROFILE_LEN 8
914 #define QUERY_CMD_LABELALL "labelall\0"
915 #define QUERY_CMD_LABELALL_LEN 9
916 #define QUERY_CMD_DATA "data\0"
917 #define QUERY_CMD_DATA_LEN 5
920 * aa_write_access - generic permissions and data query
921 * @file: pointer to open apparmorfs/access file
922 * @ubuf: user buffer containing the complete query string (NOT NULL)
923 * @count: size of ubuf
924 * @ppos: position in the file (MUST BE ZERO)
926 * Allows for one permissions or data query per open(), write(), and read()
927 * sequence. The only queries currently supported are label-based queries for
928 * permissions or data.
930 * For permissions queries, ubuf must begin with "label\0", followed by the
931 * profile query specific format described in the query_label() function
934 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
935 * <LABEL> is the name of the security confinement context and <KEY> is the
936 * name of the data to retrieve.
938 * Returns: number of bytes written or -errno on failure
940 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
941 size_t count, loff_t *ppos)
943 struct multi_transaction *t;
949 t = multi_transaction_new(file, ubuf, count);
953 if (count > QUERY_CMD_PROFILE_LEN &&
954 !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
955 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
956 t->data + QUERY_CMD_PROFILE_LEN,
957 count - QUERY_CMD_PROFILE_LEN, true);
958 } else if (count > QUERY_CMD_LABEL_LEN &&
959 !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
960 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
961 t->data + QUERY_CMD_LABEL_LEN,
962 count - QUERY_CMD_LABEL_LEN, true);
963 } else if (count > QUERY_CMD_LABELALL_LEN &&
964 !memcmp(t->data, QUERY_CMD_LABELALL,
965 QUERY_CMD_LABELALL_LEN)) {
966 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
967 t->data + QUERY_CMD_LABELALL_LEN,
968 count - QUERY_CMD_LABELALL_LEN, false);
969 } else if (count > QUERY_CMD_DATA_LEN &&
970 !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
971 len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
972 t->data + QUERY_CMD_DATA_LEN,
973 count - QUERY_CMD_DATA_LEN);
978 put_multi_transaction(t);
982 multi_transaction_set(file, t, len);
987 static const struct file_operations aa_sfs_access = {
988 .write = aa_write_access,
989 .read = multi_transaction_read,
990 .release = multi_transaction_release,
991 .llseek = generic_file_llseek,
994 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
996 struct aa_sfs_entry *fs_file = seq->private;
1001 switch (fs_file->v_type) {
1002 case AA_SFS_TYPE_BOOLEAN:
1003 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
1005 case AA_SFS_TYPE_STRING:
1006 seq_printf(seq, "%s\n", fs_file->v.string);
1008 case AA_SFS_TYPE_U64:
1009 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1012 /* Ignore unpritable entry types. */
1019 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1021 return single_open(file, aa_sfs_seq_show, inode->i_private);
1024 const struct file_operations aa_sfs_seq_file_ops = {
1025 .owner = THIS_MODULE,
1026 .open = aa_sfs_seq_open,
1028 .llseek = seq_lseek,
1029 .release = single_release,
1033 * profile based file operations
1034 * policy/profiles/XXXX/profiles/ *
1037 #define SEQ_PROFILE_FOPS(NAME) \
1038 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1040 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1043 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1044 .owner = THIS_MODULE, \
1045 .open = seq_profile_ ##NAME ##_open, \
1047 .llseek = seq_lseek, \
1048 .release = seq_profile_release, \
1051 static int seq_profile_open(struct inode *inode, struct file *file,
1052 int (*show)(struct seq_file *, void *))
1054 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1055 int error = single_open(file, show, proxy);
1058 file->private_data = NULL;
1059 aa_put_proxy(proxy);
1065 static int seq_profile_release(struct inode *inode, struct file *file)
1067 struct seq_file *seq = (struct seq_file *) file->private_data;
1069 aa_put_proxy(seq->private);
1070 return single_release(inode, file);
1073 static int seq_profile_name_show(struct seq_file *seq, void *v)
1075 struct aa_proxy *proxy = seq->private;
1076 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1077 struct aa_profile *profile = labels_profile(label);
1078 seq_printf(seq, "%s\n", profile->base.name);
1079 aa_put_label(label);
1084 static int seq_profile_mode_show(struct seq_file *seq, void *v)
1086 struct aa_proxy *proxy = seq->private;
1087 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1088 struct aa_profile *profile = labels_profile(label);
1089 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1090 aa_put_label(label);
1095 static int seq_profile_attach_show(struct seq_file *seq, void *v)
1097 struct aa_proxy *proxy = seq->private;
1098 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1099 struct aa_profile *profile = labels_profile(label);
1100 if (profile->attach)
1101 seq_printf(seq, "%s\n", profile->attach);
1102 else if (profile->xmatch)
1103 seq_puts(seq, "<unknown>\n");
1105 seq_printf(seq, "%s\n", profile->base.name);
1106 aa_put_label(label);
1111 static int seq_profile_hash_show(struct seq_file *seq, void *v)
1113 struct aa_proxy *proxy = seq->private;
1114 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1115 struct aa_profile *profile = labels_profile(label);
1116 unsigned int i, size = aa_hash_size();
1118 if (profile->hash) {
1119 for (i = 0; i < size; i++)
1120 seq_printf(seq, "%.2x", profile->hash[i]);
1121 seq_putc(seq, '\n');
1123 aa_put_label(label);
1128 SEQ_PROFILE_FOPS(name);
1129 SEQ_PROFILE_FOPS(mode);
1130 SEQ_PROFILE_FOPS(attach);
1131 SEQ_PROFILE_FOPS(hash);
1134 * namespace based files
1135 * several root files and
1139 #define SEQ_NS_FOPS(NAME) \
1140 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1142 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1145 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1146 .owner = THIS_MODULE, \
1147 .open = seq_ns_ ##NAME ##_open, \
1149 .llseek = seq_lseek, \
1150 .release = single_release, \
1153 static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1155 struct aa_label *label;
1157 label = begin_current_label_crit_section();
1158 seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
1159 end_current_label_crit_section(label);
1164 static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
1166 struct aa_label *label;
1167 struct aa_profile *profile;
1171 label = begin_current_label_crit_section();
1173 if (label->size > 1) {
1174 label_for_each(it, label, profile)
1175 if (profile->ns != labels_ns(label)) {
1181 seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
1182 end_current_label_crit_section(label);
1187 static int seq_ns_level_show(struct seq_file *seq, void *v)
1189 struct aa_label *label;
1191 label = begin_current_label_crit_section();
1192 seq_printf(seq, "%d\n", labels_ns(label)->level);
1193 end_current_label_crit_section(label);
1198 static int seq_ns_name_show(struct seq_file *seq, void *v)
1200 struct aa_label *label = begin_current_label_crit_section();
1201 seq_printf(seq, "%s\n", labels_ns(label)->base.name);
1202 end_current_label_crit_section(label);
1207 SEQ_NS_FOPS(stacked);
1208 SEQ_NS_FOPS(nsstacked);
1213 /* policy/raw_data/ * file ops */
1215 #define SEQ_RAWDATA_FOPS(NAME) \
1216 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1218 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1221 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1222 .owner = THIS_MODULE, \
1223 .open = seq_rawdata_ ##NAME ##_open, \
1225 .llseek = seq_lseek, \
1226 .release = seq_rawdata_release, \
1229 static int seq_rawdata_open(struct inode *inode, struct file *file,
1230 int (*show)(struct seq_file *, void *))
1232 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1236 /* lost race this ent is being reaped */
1239 error = single_open(file, show, data);
1241 AA_BUG(file->private_data &&
1242 ((struct seq_file *)file->private_data)->private);
1243 aa_put_loaddata(data);
1249 static int seq_rawdata_release(struct inode *inode, struct file *file)
1251 struct seq_file *seq = (struct seq_file *) file->private_data;
1254 aa_put_loaddata(seq->private);
1256 return single_release(inode, file);
1259 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1261 struct aa_loaddata *data = seq->private;
1263 seq_printf(seq, "v%d\n", data->abi);
1268 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1270 struct aa_loaddata *data = seq->private;
1272 seq_printf(seq, "%ld\n", data->revision);
1277 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1279 struct aa_loaddata *data = seq->private;
1280 unsigned int i, size = aa_hash_size();
1283 for (i = 0; i < size; i++)
1284 seq_printf(seq, "%.2x", data->hash[i]);
1285 seq_putc(seq, '\n');
1291 SEQ_RAWDATA_FOPS(abi);
1292 SEQ_RAWDATA_FOPS(revision);
1293 SEQ_RAWDATA_FOPS(hash);
1295 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1298 struct aa_loaddata *rawdata = file->private_data;
1300 return simple_read_from_buffer(buf, size, ppos, rawdata->data,
1304 static int rawdata_release(struct inode *inode, struct file *file)
1306 aa_put_loaddata(file->private_data);
1311 static int rawdata_open(struct inode *inode, struct file *file)
1313 if (!policy_view_capable(NULL))
1315 file->private_data = __aa_get_loaddata(inode->i_private);
1316 if (!file->private_data)
1317 /* lost race: this entry is being reaped */
1323 static const struct file_operations rawdata_fops = {
1324 .open = rawdata_open,
1325 .read = rawdata_read,
1326 .llseek = generic_file_llseek,
1327 .release = rawdata_release,
1330 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1334 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1335 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1336 /* no refcounts on i_private */
1337 aafs_remove(rawdata->dents[i]);
1338 rawdata->dents[i] = NULL;
1343 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1345 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1348 remove_rawdata_dents(rawdata);
1349 list_del_init(&rawdata->list);
1350 aa_put_ns(rawdata->ns);
1355 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1357 struct dentry *dent, *dir;
1361 AA_BUG(!mutex_is_locked(&ns->lock));
1362 AA_BUG(!ns_subdata_dir(ns));
1365 * just use ns revision dir was originally created at. This is
1366 * under ns->lock and if load is successful revision will be
1367 * bumped and is guaranteed to be unique
1369 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1373 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1375 /* ->name freed when rawdata freed */
1376 return PTR_ERR(dir);
1377 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1379 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1380 &seq_rawdata_abi_fops);
1383 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1385 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1386 &seq_rawdata_revision_fops);
1389 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1391 if (aa_g_hash_policy) {
1392 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1393 rawdata, &seq_rawdata_hash_fops);
1396 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1399 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1400 dir, rawdata, &rawdata_fops);
1403 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1404 d_inode(dent)->i_size = rawdata->size;
1406 rawdata->ns = aa_get_ns(ns);
1407 list_add(&rawdata->list, &ns->rawdata_list);
1408 /* no refcount on inode rawdata */
1413 remove_rawdata_dents(rawdata);
1415 return PTR_ERR(dent);
1418 /** fns to setup dynamic per profile/namespace files **/
1422 * Requires: @profile->ns->lock held
1424 void __aafs_profile_rmdir(struct aa_profile *profile)
1426 struct aa_profile *child;
1432 list_for_each_entry(child, &profile->base.profiles, base.list)
1433 __aafs_profile_rmdir(child);
1435 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1436 struct aa_proxy *proxy;
1437 if (!profile->dents[i])
1440 proxy = d_inode(profile->dents[i])->i_private;
1441 aafs_remove(profile->dents[i]);
1442 aa_put_proxy(proxy);
1443 profile->dents[i] = NULL;
1449 * Requires: @old->ns->lock held
1451 void __aafs_profile_migrate_dents(struct aa_profile *old,
1452 struct aa_profile *new)
1458 AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
1460 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1461 new->dents[i] = old->dents[i];
1463 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
1464 old->dents[i] = NULL;
1468 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1469 struct aa_profile *profile,
1470 const struct file_operations *fops)
1472 struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1473 struct dentry *dent;
1475 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1477 aa_put_proxy(proxy);
1482 static int profile_depth(struct aa_profile *profile)
1487 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1494 static int gen_symlink_name(char *buffer, size_t bsize, int depth,
1495 const char *dirname, const char *fname)
1499 for (; depth > 0; depth--) {
1501 return -ENAMETOOLONG;
1502 strcpy(buffer, "../../");
1507 error = snprintf(buffer, bsize, "raw_data/%s/%s", dirname, fname);
1508 if (error >= bsize || error < 0)
1509 return -ENAMETOOLONG;
1515 * Requires: @profile->ns->lock held
1517 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1519 struct aa_profile *child;
1520 struct dentry *dent = NULL, *dir;
1524 AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
1527 struct aa_profile *p;
1528 p = aa_deref_parent(profile);
1530 /* adding to parent that previously didn't have children */
1531 dent = aafs_create_dir("profiles", dent);
1534 prof_child_dir(p) = parent = dent;
1537 if (!profile->dirname) {
1539 len = mangle_name(profile->base.name, NULL);
1540 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1542 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1543 if (!profile->dirname) {
1548 mangle_name(profile->base.name, profile->dirname);
1549 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1552 dent = aafs_create_dir(profile->dirname, parent);
1555 prof_dir(profile) = dir = dent;
1557 dent = create_profile_file(dir, "name", profile,
1558 &seq_profile_name_fops);
1561 profile->dents[AAFS_PROF_NAME] = dent;
1563 dent = create_profile_file(dir, "mode", profile,
1564 &seq_profile_mode_fops);
1567 profile->dents[AAFS_PROF_MODE] = dent;
1569 dent = create_profile_file(dir, "attach", profile,
1570 &seq_profile_attach_fops);
1573 profile->dents[AAFS_PROF_ATTACH] = dent;
1575 if (profile->hash) {
1576 dent = create_profile_file(dir, "sha1", profile,
1577 &seq_profile_hash_fops);
1580 profile->dents[AAFS_PROF_HASH] = dent;
1583 if (profile->rawdata) {
1585 int depth = profile_depth(profile);
1587 error = gen_symlink_name(target, sizeof(target), depth,
1588 profile->rawdata->name, "sha1");
1591 dent = aafs_create_symlink("raw_sha1", dir, target, NULL);
1594 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1596 error = gen_symlink_name(target, sizeof(target), depth,
1597 profile->rawdata->name, "abi");
1600 dent = aafs_create_symlink("raw_abi", dir, target, NULL);
1603 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1605 error = gen_symlink_name(target, sizeof(target), depth,
1606 profile->rawdata->name, "raw_data");
1609 dent = aafs_create_symlink("raw_data", dir, target, NULL);
1612 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1615 list_for_each_entry(child, &profile->base.profiles, base.list) {
1616 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1624 error = PTR_ERR(dent);
1627 __aafs_profile_rmdir(profile);
1632 static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
1634 struct aa_ns *ns, *parent;
1635 /* TODO: improve permission check */
1636 struct aa_label *label;
1639 label = begin_current_label_crit_section();
1640 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1641 end_current_label_crit_section(label);
1645 parent = aa_get_ns(dir->i_private);
1646 AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1648 /* we have to unlock and then relock to get locking order right
1652 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1653 mutex_lock(&parent->lock);
1654 inode_lock_nested(dir, I_MUTEX_PARENT);
1658 error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
1663 ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1666 error = PTR_ERR(ns);
1670 aa_put_ns(ns); /* list ref remains */
1673 simple_release_fs(&aafs_mnt, &aafs_count);
1675 mutex_unlock(&parent->lock);
1681 static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1683 struct aa_ns *ns, *parent;
1684 /* TODO: improve permission check */
1685 struct aa_label *label;
1688 label = begin_current_label_crit_section();
1689 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1690 end_current_label_crit_section(label);
1694 parent = aa_get_ns(dir->i_private);
1695 /* rmdir calls the generic securityfs functions to remove files
1696 * from the apparmor dir. It is up to the apparmor ns locking
1700 inode_unlock(dentry->d_inode);
1702 mutex_lock(&parent->lock);
1703 ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1704 dentry->d_name.len));
1709 AA_BUG(ns_dir(ns) != dentry);
1715 mutex_unlock(&parent->lock);
1716 inode_lock_nested(dir, I_MUTEX_PARENT);
1717 inode_lock(dentry->d_inode);
1723 static const struct inode_operations ns_dir_inode_operations = {
1724 .lookup = simple_lookup,
1725 .mkdir = ns_mkdir_op,
1726 .rmdir = ns_rmdir_op,
1729 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1731 struct aa_loaddata *ent, *tmp;
1733 AA_BUG(!mutex_is_locked(&ns->lock));
1735 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1736 __aa_fs_remove_rawdata(ent);
1741 * Requires: @ns->lock held
1743 void __aafs_ns_rmdir(struct aa_ns *ns)
1746 struct aa_profile *child;
1751 AA_BUG(!mutex_is_locked(&ns->lock));
1753 list_for_each_entry(child, &ns->base.profiles, base.list)
1754 __aafs_profile_rmdir(child);
1756 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1757 mutex_lock(&sub->lock);
1758 __aafs_ns_rmdir(sub);
1759 mutex_unlock(&sub->lock);
1762 __aa_fs_list_remove_rawdata(ns);
1764 if (ns_subns_dir(ns)) {
1765 sub = d_inode(ns_subns_dir(ns))->i_private;
1768 if (ns_subload(ns)) {
1769 sub = d_inode(ns_subload(ns))->i_private;
1772 if (ns_subreplace(ns)) {
1773 sub = d_inode(ns_subreplace(ns))->i_private;
1776 if (ns_subremove(ns)) {
1777 sub = d_inode(ns_subremove(ns))->i_private;
1780 if (ns_subrevision(ns)) {
1781 sub = d_inode(ns_subrevision(ns))->i_private;
1785 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1786 aafs_remove(ns->dents[i]);
1787 ns->dents[i] = NULL;
1791 /* assumes cleanup in caller */
1792 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1794 struct dentry *dent;
1799 dent = aafs_create_dir("profiles", dir);
1801 return PTR_ERR(dent);
1802 ns_subprofs_dir(ns) = dent;
1804 dent = aafs_create_dir("raw_data", dir);
1806 return PTR_ERR(dent);
1807 ns_subdata_dir(ns) = dent;
1809 dent = aafs_create_file("revision", 0444, dir, ns,
1810 &aa_fs_ns_revision_fops);
1812 return PTR_ERR(dent);
1814 ns_subrevision(ns) = dent;
1816 dent = aafs_create_file(".load", 0640, dir, ns,
1817 &aa_fs_profile_load);
1819 return PTR_ERR(dent);
1821 ns_subload(ns) = dent;
1823 dent = aafs_create_file(".replace", 0640, dir, ns,
1824 &aa_fs_profile_replace);
1826 return PTR_ERR(dent);
1828 ns_subreplace(ns) = dent;
1830 dent = aafs_create_file(".remove", 0640, dir, ns,
1831 &aa_fs_profile_remove);
1833 return PTR_ERR(dent);
1835 ns_subremove(ns) = dent;
1837 /* use create_dentry so we can supply private data */
1838 dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
1839 &ns_dir_inode_operations);
1841 return PTR_ERR(dent);
1843 ns_subns_dir(ns) = dent;
1849 * Requires: @ns->lock held
1851 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
1852 struct dentry *dent)
1855 struct aa_profile *child;
1861 AA_BUG(!mutex_is_locked(&ns->lock));
1864 name = ns->base.name;
1867 /* create ns dir if it doesn't already exist */
1868 dent = aafs_create_dir(name, parent);
1873 ns_dir(ns) = dir = dent;
1874 error = __aafs_ns_mkdir_entries(ns, dir);
1879 list_for_each_entry(child, &ns->base.profiles, base.list) {
1880 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
1886 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1887 mutex_lock(&sub->lock);
1888 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
1889 mutex_unlock(&sub->lock);
1897 error = PTR_ERR(dent);
1900 __aafs_ns_rmdir(ns);
1906 * __next_ns - find the next namespace to list
1907 * @root: root namespace to stop search at (NOT NULL)
1908 * @ns: current ns position (NOT NULL)
1910 * Find the next namespace from @ns under @root and handle all locking needed
1911 * while switching current namespace.
1913 * Returns: next namespace or NULL if at last namespace under @root
1914 * Requires: ns->parent->lock to be held
1915 * NOTE: will not unlock root->lock
1917 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
1919 struct aa_ns *parent, *next;
1923 AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
1925 /* is next namespace a child */
1926 if (!list_empty(&ns->sub_ns)) {
1927 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
1928 mutex_lock(&next->lock);
1932 /* check if the next ns is a sibling, parent, gp, .. */
1933 parent = ns->parent;
1934 while (ns != root) {
1935 mutex_unlock(&ns->lock);
1936 next = list_next_entry(ns, base.list);
1937 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
1938 mutex_lock(&next->lock);
1942 parent = parent->parent;
1949 * __first_profile - find the first profile in a namespace
1950 * @root: namespace that is root of profiles being displayed (NOT NULL)
1951 * @ns: namespace to start in (NOT NULL)
1953 * Returns: unrefcounted profile or NULL if no profile
1954 * Requires: profile->ns.lock to be held
1956 static struct aa_profile *__first_profile(struct aa_ns *root,
1960 AA_BUG(ns && !mutex_is_locked(&ns->lock));
1962 for (; ns; ns = __next_ns(root, ns)) {
1963 if (!list_empty(&ns->base.profiles))
1964 return list_first_entry(&ns->base.profiles,
1965 struct aa_profile, base.list);
1971 * __next_profile - step to the next profile in a profile tree
1972 * @profile: current profile in tree (NOT NULL)
1974 * Perform a depth first traversal on the profile tree in a namespace
1976 * Returns: next profile or NULL if done
1977 * Requires: profile->ns.lock to be held
1979 static struct aa_profile *__next_profile(struct aa_profile *p)
1981 struct aa_profile *parent;
1982 struct aa_ns *ns = p->ns;
1984 AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
1986 /* is next profile a child */
1987 if (!list_empty(&p->base.profiles))
1988 return list_first_entry(&p->base.profiles, typeof(*p),
1991 /* is next profile a sibling, parent sibling, gp, sibling, .. */
1992 parent = rcu_dereference_protected(p->parent,
1993 mutex_is_locked(&p->ns->lock));
1995 p = list_next_entry(p, base.list);
1996 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
1999 parent = rcu_dereference_protected(parent->parent,
2000 mutex_is_locked(&parent->ns->lock));
2003 /* is next another profile in the namespace */
2004 p = list_next_entry(p, base.list);
2005 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
2012 * next_profile - step to the next profile in where ever it may be
2013 * @root: root namespace (NOT NULL)
2014 * @profile: current profile (NOT NULL)
2016 * Returns: next profile or NULL if there isn't one
2018 static struct aa_profile *next_profile(struct aa_ns *root,
2019 struct aa_profile *profile)
2021 struct aa_profile *next = __next_profile(profile);
2025 /* finished all profiles in namespace move to next namespace */
2026 return __first_profile(root, __next_ns(root, profile->ns));
2030 * p_start - start a depth first traversal of profile tree
2031 * @f: seq_file to fill
2032 * @pos: current position
2034 * Returns: first profile under current namespace or NULL if none found
2036 * acquires first ns->lock
2038 static void *p_start(struct seq_file *f, loff_t *pos)
2040 struct aa_profile *profile = NULL;
2041 struct aa_ns *root = aa_get_current_ns();
2045 /* find the first profile */
2046 mutex_lock(&root->lock);
2047 profile = __first_profile(root, root);
2049 /* skip to position */
2050 for (; profile && l > 0; l--)
2051 profile = next_profile(root, profile);
2057 * p_next - read the next profile entry
2058 * @f: seq_file to fill
2059 * @p: profile previously returned
2060 * @pos: current position
2062 * Returns: next profile after @p or NULL if none
2064 * may acquire/release locks in namespace tree as necessary
2066 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2068 struct aa_profile *profile = p;
2069 struct aa_ns *ns = f->private;
2072 return next_profile(ns, profile);
2076 * p_stop - stop depth first traversal
2077 * @f: seq_file we are filling
2078 * @p: the last profile writen
2080 * Release all locking done by p_start/p_next on namespace tree
2082 static void p_stop(struct seq_file *f, void *p)
2084 struct aa_profile *profile = p;
2085 struct aa_ns *root = f->private, *ns;
2088 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2089 mutex_unlock(&ns->lock);
2091 mutex_unlock(&root->lock);
2096 * seq_show_profile - show a profile entry
2097 * @f: seq_file to file
2098 * @p: current position (profile) (NOT NULL)
2100 * Returns: error on failure
2102 static int seq_show_profile(struct seq_file *f, void *p)
2104 struct aa_profile *profile = (struct aa_profile *)p;
2105 struct aa_ns *root = f->private;
2107 aa_label_seq_xprint(f, root, &profile->label,
2108 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2114 static const struct seq_operations aa_sfs_profiles_op = {
2118 .show = seq_show_profile,
2121 static int profiles_open(struct inode *inode, struct file *file)
2123 if (!policy_view_capable(NULL))
2126 return seq_open(file, &aa_sfs_profiles_op);
2129 static int profiles_release(struct inode *inode, struct file *file)
2131 return seq_release(inode, file);
2134 static const struct file_operations aa_sfs_profiles_fops = {
2135 .open = profiles_open,
2137 .llseek = seq_lseek,
2138 .release = profiles_release,
2142 /** Base file system setup **/
2143 static struct aa_sfs_entry aa_sfs_entry_file[] = {
2144 AA_SFS_FILE_STRING("mask",
2145 "create read write exec append mmap_exec link lock"),
2149 static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2150 AA_SFS_FILE_STRING("mask", "read trace"),
2154 static struct aa_sfs_entry aa_sfs_entry_signal[] = {
2155 AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
2159 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2160 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2161 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2162 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2163 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2164 AA_SFS_FILE_BOOLEAN("stack", 1),
2165 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2166 AA_SFS_FILE_STRING("version", "1.2"),
2170 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2171 AA_SFS_FILE_BOOLEAN("v5", 1),
2172 AA_SFS_FILE_BOOLEAN("v6", 1),
2173 AA_SFS_FILE_BOOLEAN("v7", 1),
2177 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2178 AA_SFS_DIR("versions", aa_sfs_entry_versions),
2179 AA_SFS_FILE_BOOLEAN("set_load", 1),
2183 static struct aa_sfs_entry aa_sfs_entry_mount[] = {
2184 AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
2188 static struct aa_sfs_entry aa_sfs_entry_ns[] = {
2189 AA_SFS_FILE_BOOLEAN("profile", 1),
2190 AA_SFS_FILE_BOOLEAN("pivot_root", 0),
2194 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2195 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2196 AA_SFS_FILE_BOOLEAN("data", 1),
2197 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2201 static struct aa_sfs_entry aa_sfs_entry_query[] = {
2202 AA_SFS_DIR("label", aa_sfs_entry_query_label),
2205 static struct aa_sfs_entry aa_sfs_entry_features[] = {
2206 AA_SFS_DIR("policy", aa_sfs_entry_policy),
2207 AA_SFS_DIR("domain", aa_sfs_entry_domain),
2208 AA_SFS_DIR("file", aa_sfs_entry_file),
2209 AA_SFS_DIR("mount", aa_sfs_entry_mount),
2210 AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
2211 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
2212 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
2213 AA_SFS_DIR("caps", aa_sfs_entry_caps),
2214 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
2215 AA_SFS_DIR("signal", aa_sfs_entry_signal),
2216 AA_SFS_DIR("query", aa_sfs_entry_query),
2220 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2221 AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
2222 AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
2223 AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
2224 AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
2225 AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
2226 AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
2227 AA_SFS_DIR("features", aa_sfs_entry_features),
2231 static struct aa_sfs_entry aa_sfs_entry =
2232 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2235 * entry_create_file - create a file entry in the apparmor securityfs
2236 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2237 * @parent: the parent dentry in the securityfs
2239 * Use entry_remove_file to remove entries created with this fn.
2241 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2242 struct dentry *parent)
2246 fs_file->dentry = securityfs_create_file(fs_file->name,
2247 S_IFREG | fs_file->mode,
2250 if (IS_ERR(fs_file->dentry)) {
2251 error = PTR_ERR(fs_file->dentry);
2252 fs_file->dentry = NULL;
2257 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2259 * entry_create_dir - recursively create a directory entry in the securityfs
2260 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2261 * @parent: the parent dentry in the securityfs
2263 * Use entry_remove_dir to remove entries created with this fn.
2265 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2266 struct dentry *parent)
2268 struct aa_sfs_entry *fs_file;
2272 dir = securityfs_create_dir(fs_dir->name, parent);
2274 return PTR_ERR(dir);
2275 fs_dir->dentry = dir;
2277 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2278 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2279 error = entry_create_dir(fs_file, fs_dir->dentry);
2281 error = entry_create_file(fs_file, fs_dir->dentry);
2289 entry_remove_dir(fs_dir);
2295 * entry_remove_file - drop a single file entry in the apparmor securityfs
2296 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2298 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2300 if (!fs_file->dentry)
2303 securityfs_remove(fs_file->dentry);
2304 fs_file->dentry = NULL;
2308 * entry_remove_dir - recursively drop a directory entry from the securityfs
2309 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2311 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2313 struct aa_sfs_entry *fs_file;
2315 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2316 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2317 entry_remove_dir(fs_file);
2319 entry_remove_file(fs_file);
2322 entry_remove_file(fs_dir);
2326 * aa_destroy_aafs - cleanup and free aafs
2328 * releases dentries allocated by aa_create_aafs
2330 void __init aa_destroy_aafs(void)
2332 entry_remove_dir(&aa_sfs_entry);
2336 #define NULL_FILE_NAME ".null"
2337 struct path aa_null;
2339 static int aa_mk_null_file(struct dentry *parent)
2341 struct vfsmount *mount = NULL;
2342 struct dentry *dentry;
2343 struct inode *inode;
2345 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2350 inode_lock(d_inode(parent));
2351 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2352 if (IS_ERR(dentry)) {
2353 error = PTR_ERR(dentry);
2356 inode = new_inode(parent->d_inode->i_sb);
2362 inode->i_ino = get_next_ino();
2363 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2364 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
2365 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2366 MKDEV(MEM_MAJOR, 3));
2367 d_instantiate(dentry, inode);
2368 aa_null.dentry = dget(dentry);
2369 aa_null.mnt = mntget(mount);
2376 inode_unlock(d_inode(parent));
2377 simple_release_fs(&mount, &count);
2383 static const char *policy_get_link(struct dentry *dentry,
2384 struct inode *inode,
2385 struct delayed_call *done)
2391 return ERR_PTR(-ECHILD);
2392 ns = aa_get_current_ns();
2393 path.mnt = mntget(aafs_mnt);
2394 path.dentry = dget(ns_dir(ns));
2395 nd_jump_link(&path);
2401 static int ns_get_name(char *buf, size_t size, struct aa_ns *ns,
2402 struct inode *inode)
2404 int res = snprintf(buf, size, "%s:[%lu]", AAFS_NAME, inode->i_ino);
2406 if (res < 0 || res >= size)
2412 static int policy_readlink(struct dentry *dentry, char __user *buffer,
2419 ns = aa_get_current_ns();
2420 res = ns_get_name(name, sizeof(name), ns, d_inode(dentry));
2422 res = readlink_copy(buffer, buflen, name);
2428 static const struct inode_operations policy_link_iops = {
2429 .readlink = policy_readlink,
2430 .get_link = policy_get_link,
2435 * aa_create_aafs - create the apparmor security filesystem
2437 * dentries created here are released by aa_destroy_aafs
2439 * Returns: error on failure
2441 static int __init aa_create_aafs(void)
2443 struct dentry *dent;
2446 if (!apparmor_initialized)
2449 if (aa_sfs_entry.dentry) {
2450 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2454 /* setup apparmorfs used to virtualize policy/ */
2455 aafs_mnt = kern_mount(&aafs_ops);
2456 if (IS_ERR(aafs_mnt))
2457 panic("can't set apparmorfs up\n");
2458 aafs_mnt->mnt_sb->s_flags &= ~MS_NOUSER;
2460 /* Populate fs tree. */
2461 error = entry_create_dir(&aa_sfs_entry, NULL);
2465 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2466 NULL, &aa_fs_profile_load);
2468 error = PTR_ERR(dent);
2471 ns_subload(root_ns) = dent;
2473 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2474 NULL, &aa_fs_profile_replace);
2476 error = PTR_ERR(dent);
2479 ns_subreplace(root_ns) = dent;
2481 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2482 NULL, &aa_fs_profile_remove);
2484 error = PTR_ERR(dent);
2487 ns_subremove(root_ns) = dent;
2489 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2490 NULL, &aa_fs_ns_revision_fops);
2492 error = PTR_ERR(dent);
2495 ns_subrevision(root_ns) = dent;
2497 /* policy tree referenced by magic policy symlink */
2498 mutex_lock(&root_ns->lock);
2499 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2500 aafs_mnt->mnt_root);
2501 mutex_unlock(&root_ns->lock);
2505 /* magic symlink similar to nsfs redirects based on task policy */
2506 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2507 NULL, &policy_link_iops);
2509 error = PTR_ERR(dent);
2513 error = aa_mk_null_file(aa_sfs_entry.dentry);
2517 /* TODO: add default profile to apparmorfs */
2519 /* Report that AppArmor fs is enabled */
2520 aa_info_message("AppArmor Filesystem Enabled");
2525 AA_ERROR("Error creating AppArmor securityfs\n");
2529 fs_initcall(aa_create_aafs);