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/cred.h"
34 #include "include/crypto.h"
35 #include "include/ipc.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 seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino);
126 static void aafs_i_callback(struct rcu_head *head)
128 struct inode *inode = container_of(head, struct inode, i_rcu);
129 if (S_ISLNK(inode->i_mode))
130 kfree(inode->i_link);
131 free_inode_nonrcu(inode);
134 static void aafs_destroy_inode(struct inode *inode)
136 call_rcu(&inode->i_rcu, aafs_i_callback);
139 static const struct super_operations aafs_super_ops = {
140 .statfs = simple_statfs,
141 .destroy_inode = aafs_destroy_inode,
142 .show_path = aafs_show_path,
145 static int fill_super(struct super_block *sb, void *data, int silent)
147 static struct tree_descr files[] = { {""} };
150 error = simple_fill_super(sb, AAFS_MAGIC, files);
153 sb->s_op = &aafs_super_ops;
158 static struct dentry *aafs_mount(struct file_system_type *fs_type,
159 int flags, const char *dev_name, void *data)
161 return mount_single(fs_type, flags, data, fill_super);
164 static struct file_system_type aafs_ops = {
165 .owner = THIS_MODULE,
168 .kill_sb = kill_anon_super,
172 * __aafs_setup_d_inode - basic inode setup for apparmorfs
173 * @dir: parent directory for the dentry
174 * @dentry: dentry we are seting the inode up for
175 * @mode: permissions the file should have
176 * @data: data to store on inode.i_private, available in open()
177 * @link: if symlink, symlink target string
178 * @fops: struct file_operations that should be used
179 * @iops: struct of inode_operations that should be used
181 static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
182 umode_t mode, void *data, char *link,
183 const struct file_operations *fops,
184 const struct inode_operations *iops)
186 struct inode *inode = new_inode(dir->i_sb);
194 inode->i_ino = get_next_ino();
195 inode->i_mode = mode;
196 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
197 inode->i_private = data;
199 inode->i_op = iops ? iops : &simple_dir_inode_operations;
200 inode->i_fop = &simple_dir_operations;
203 } else if (S_ISLNK(mode)) {
204 inode->i_op = iops ? iops : &simple_symlink_inode_operations;
205 inode->i_link = link;
209 d_instantiate(dentry, inode);
216 * aafs_create - create a dentry in the apparmorfs filesystem
218 * @name: name of dentry to create
219 * @mode: permissions the file should have
220 * @parent: parent directory for this dentry
221 * @data: data to store on inode.i_private, available in open()
222 * @link: if symlink, symlink target string
223 * @fops: struct file_operations that should be used for
224 * @iops: struct of inode_operations that should be used
226 * This is the basic "create a xxx" function for apparmorfs.
228 * Returns a pointer to a dentry if it succeeds, that must be free with
229 * aafs_remove(). Will return ERR_PTR on failure.
231 static struct dentry *aafs_create(const char *name, umode_t mode,
232 struct dentry *parent, void *data, void *link,
233 const struct file_operations *fops,
234 const struct inode_operations *iops)
236 struct dentry *dentry;
243 if (!(mode & S_IFMT))
244 mode = (mode & S_IALLUGO) | S_IFREG;
246 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
248 return ERR_PTR(error);
250 dir = d_inode(parent);
253 dentry = lookup_one_len(name, parent, strlen(name));
254 if (IS_ERR(dentry)) {
255 error = PTR_ERR(dentry);
259 if (d_really_is_positive(dentry)) {
264 error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
276 simple_release_fs(&aafs_mnt, &aafs_count);
278 return ERR_PTR(error);
282 * aafs_create_file - create a file in the apparmorfs filesystem
284 * @name: name of dentry to create
285 * @mode: permissions the file should have
286 * @parent: parent directory for this dentry
287 * @data: data to store on inode.i_private, available in open()
288 * @fops: struct file_operations that should be used for
292 static struct dentry *aafs_create_file(const char *name, umode_t mode,
293 struct dentry *parent, void *data,
294 const struct file_operations *fops)
296 return aafs_create(name, mode, parent, data, NULL, fops, NULL);
300 * aafs_create_dir - create a directory in the apparmorfs filesystem
302 * @name: name of dentry to create
303 * @parent: parent directory for this dentry
307 static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
309 return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
314 * aafs_create_symlink - create a symlink in the apparmorfs filesystem
315 * @name: name of dentry to create
316 * @parent: parent directory for this dentry
317 * @target: if symlink, symlink target string
318 * @private: private data
319 * @iops: struct of inode_operations that should be used
321 * If @target parameter is %NULL, then the @iops parameter needs to be
322 * setup to handle .readlink and .get_link inode_operations.
324 static struct dentry *aafs_create_symlink(const char *name,
325 struct dentry *parent,
328 const struct inode_operations *iops)
335 return ERR_PTR(-ENOMEM);
337 dent = aafs_create(name, S_IFLNK | 0444, parent, private, link, NULL,
346 * aafs_remove - removes a file or directory from the apparmorfs filesystem
348 * @dentry: dentry of the file/directory/symlink to removed.
350 static void aafs_remove(struct dentry *dentry)
354 if (!dentry || IS_ERR(dentry))
357 dir = d_inode(dentry->d_parent);
359 if (simple_positive(dentry)) {
360 if (d_is_dir(dentry))
361 simple_rmdir(dir, dentry);
363 simple_unlink(dir, dentry);
368 simple_release_fs(&aafs_mnt, &aafs_count);
373 * aa_fs - policy load/replace/remove
377 * aa_simple_write_to_buffer - common routine for getting policy from user
378 * @userbuf: user buffer to copy data from (NOT NULL)
379 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
380 * @copy_size: size of data to copy from user buffer
381 * @pos: position write is at in the file (NOT NULL)
383 * Returns: kernel buffer containing copy of user buffer data or an
384 * ERR_PTR on failure.
386 static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
391 struct aa_loaddata *data;
393 AA_BUG(copy_size > alloc_size);
396 /* only writes from pos 0, that is complete writes */
397 return ERR_PTR(-ESPIPE);
399 /* freed by caller to simple_write_to_buffer */
400 data = aa_loaddata_alloc(alloc_size);
404 data->size = copy_size;
405 if (copy_from_user(data->data, userbuf, copy_size)) {
407 return ERR_PTR(-EFAULT);
413 static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
414 loff_t *pos, struct aa_ns *ns)
416 struct aa_loaddata *data;
417 struct aa_label *label;
420 label = begin_current_label_crit_section();
422 /* high level check about policy management - fine grained in
425 error = aa_may_manage_policy(label, ns, mask);
429 data = aa_simple_write_to_buffer(buf, size, size, pos);
430 error = PTR_ERR(data);
432 error = aa_replace_profiles(ns, label, mask, data);
433 aa_put_loaddata(data);
436 end_current_label_crit_section(label);
441 /* .load file hook fn to load policy */
442 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
445 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
446 int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
453 static const struct file_operations aa_fs_profile_load = {
454 .write = profile_load,
455 .llseek = default_llseek,
458 /* .replace file hook fn to load and/or replace policy */
459 static ssize_t profile_replace(struct file *f, const char __user *buf,
460 size_t size, loff_t *pos)
462 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
463 int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
470 static const struct file_operations aa_fs_profile_replace = {
471 .write = profile_replace,
472 .llseek = default_llseek,
475 /* .remove file hook fn to remove loaded policy */
476 static ssize_t profile_remove(struct file *f, const char __user *buf,
477 size_t size, loff_t *pos)
479 struct aa_loaddata *data;
480 struct aa_label *label;
482 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
484 label = begin_current_label_crit_section();
485 /* high level check about policy management - fine grained in
488 error = aa_may_manage_policy(label, ns, AA_MAY_REMOVE_POLICY);
493 * aa_remove_profile needs a null terminated string so 1 extra
494 * byte is allocated and the copied data is null terminated.
496 data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
498 error = PTR_ERR(data);
500 data->data[size] = 0;
501 error = aa_remove_profiles(ns, label, data->data, size);
502 aa_put_loaddata(data);
505 end_current_label_crit_section(label);
510 static const struct file_operations aa_fs_profile_remove = {
511 .write = profile_remove,
512 .llseek = default_llseek,
520 /* revision file hook fn for policy loads */
521 static int ns_revision_release(struct inode *inode, struct file *file)
523 struct aa_revision *rev = file->private_data;
533 static ssize_t ns_revision_read(struct file *file, char __user *buf,
534 size_t size, loff_t *ppos)
536 struct aa_revision *rev = file->private_data;
541 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
542 last_read = rev->last_read;
543 if (last_read == rev->ns->revision) {
544 mutex_unlock(&rev->ns->lock);
545 if (file->f_flags & O_NONBLOCK)
547 if (wait_event_interruptible(rev->ns->wait,
549 READ_ONCE(rev->ns->revision)))
551 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
554 avail = sprintf(buffer, "%ld\n", rev->ns->revision);
555 if (*ppos + size > avail) {
556 rev->last_read = rev->ns->revision;
559 mutex_unlock(&rev->ns->lock);
561 return simple_read_from_buffer(buf, size, ppos, buffer, avail);
564 static int ns_revision_open(struct inode *inode, struct file *file)
566 struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
571 rev->ns = aa_get_ns(inode->i_private);
573 rev->ns = aa_get_current_ns();
574 file->private_data = rev;
579 static __poll_t ns_revision_poll(struct file *file, poll_table *pt)
581 struct aa_revision *rev = file->private_data;
585 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
586 poll_wait(file, &rev->ns->wait, pt);
587 if (rev->last_read < rev->ns->revision)
588 mask |= EPOLLIN | EPOLLRDNORM;
589 mutex_unlock(&rev->ns->lock);
595 void __aa_bump_ns_revision(struct aa_ns *ns)
597 WRITE_ONCE(ns->revision, ns->revision + 1);
598 wake_up_interruptible(&ns->wait);
601 static const struct file_operations aa_fs_ns_revision_fops = {
602 .owner = THIS_MODULE,
603 .open = ns_revision_open,
604 .poll = ns_revision_poll,
605 .read = ns_revision_read,
606 .llseek = generic_file_llseek,
607 .release = ns_revision_release,
610 static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
611 const char *match_str, size_t match_len)
613 struct aa_perms tmp = { };
615 unsigned int state = 0;
617 if (profile_unconfined(profile))
619 if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
620 dfa = profile->file.dfa;
621 state = aa_dfa_match_len(dfa, profile->file.start,
622 match_str + 1, match_len - 1);
624 struct path_cond cond = { };
626 tmp = aa_compute_fperms(dfa, state, &cond);
628 } else if (profile->policy.dfa) {
629 if (!PROFILE_MEDIATES(profile, *match_str))
630 return; /* no change to current perms */
631 dfa = profile->policy.dfa;
632 state = aa_dfa_match_len(dfa, profile->policy.start[0],
633 match_str, match_len);
635 aa_compute_perms(dfa, state, &tmp);
637 aa_apply_modes_to_perms(profile, &tmp);
638 aa_perms_accum_raw(perms, &tmp);
643 * query_data - queries a policy and writes its data to buf
644 * @buf: the resulting data is stored here (NOT NULL)
645 * @buf_len: size of buf
646 * @query: query string used to retrieve data
647 * @query_len: size of query including second NUL byte
649 * The buffers pointed to by buf and query may overlap. The query buffer is
650 * parsed before buf is written to.
652 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
653 * the security confinement context and <KEY> is the name of the data to
654 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
656 * Don't expect the contents of buf to be preserved on failure.
658 * Returns: number of characters written to buf or -errno on failure
660 static ssize_t query_data(char *buf, size_t buf_len,
661 char *query, size_t query_len)
666 struct aa_label *label, *curr;
667 struct aa_profile *profile;
668 struct aa_data *data;
673 return -EINVAL; /* need a query */
675 key = query + strnlen(query, query_len) + 1;
676 if (key + 1 >= query + query_len)
677 return -EINVAL; /* not enough space for a non-empty key */
678 if (key + strnlen(key, query + query_len - key) >= query + query_len)
679 return -EINVAL; /* must end with NUL */
681 if (buf_len < sizeof(bytes) + sizeof(blocks))
682 return -EINVAL; /* not enough space */
684 curr = begin_current_label_crit_section();
685 label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
686 end_current_label_crit_section(curr);
688 return PTR_ERR(label);
690 /* We are going to leave space for two numbers. The first is the total
691 * number of bytes we are writing after the first number. This is so
692 * users can read the full output without reallocation.
694 * The second number is the number of data blocks we're writing. An
695 * application might be confined by multiple policies having data in
698 memset(buf, 0, sizeof(bytes) + sizeof(blocks));
699 out = buf + sizeof(bytes) + sizeof(blocks);
702 label_for_each_confined(i, label, profile) {
706 data = rhashtable_lookup_fast(profile->data, &key,
710 if (out + sizeof(outle32) + data->size > buf +
713 return -EINVAL; /* not enough space */
715 outle32 = __cpu_to_le32(data->size);
716 memcpy(out, &outle32, sizeof(outle32));
717 out += sizeof(outle32);
718 memcpy(out, data->data, data->size);
725 outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
726 memcpy(buf, &outle32, sizeof(outle32));
727 outle32 = __cpu_to_le32(blocks);
728 memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
734 * query_label - queries a label and writes permissions to buf
735 * @buf: the resulting permissions string is stored here (NOT NULL)
736 * @buf_len: size of buf
737 * @query: binary query string to match against the dfa
738 * @query_len: size of query
739 * @view_only: only compute for querier's view
741 * The buffers pointed to by buf and query may overlap. The query buffer is
742 * parsed before buf is written to.
744 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
745 * the name of the label, in the current namespace, that is to be queried and
746 * DFA_STRING is a binary string to match against the label(s)'s DFA.
748 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
749 * but must *not* be NUL terminated.
751 * Returns: number of characters written to buf or -errno on failure
753 static ssize_t query_label(char *buf, size_t buf_len,
754 char *query, size_t query_len, bool view_only)
756 struct aa_profile *profile;
757 struct aa_label *label, *curr;
758 char *label_name, *match_str;
759 size_t label_name_len, match_len;
760 struct aa_perms perms;
767 label_name_len = strnlen(query, query_len);
768 if (!label_name_len || label_name_len == query_len)
772 * The extra byte is to account for the null byte between the
773 * profile name and dfa string. profile_name_len is greater
774 * than zero and less than query_len, so a byte can be safely
775 * added or subtracted.
777 match_str = label_name + label_name_len + 1;
778 match_len = query_len - label_name_len - 1;
780 curr = begin_current_label_crit_section();
781 label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
782 end_current_label_crit_section(curr);
784 return PTR_ERR(label);
788 label_for_each_in_ns(i, labels_ns(label), label, profile) {
789 profile_query_cb(profile, &perms, match_str, match_len);
792 label_for_each(i, label, profile) {
793 profile_query_cb(profile, &perms, match_str, match_len);
798 return scnprintf(buf, buf_len,
799 "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
800 perms.allow, perms.deny, perms.audit, perms.quiet);
804 * Transaction based IO.
805 * The file expects a write which triggers the transaction, and then
806 * possibly a read(s) which collects the result - which is stored in a
807 * file-local buffer. Once a new write is performed, a new set of results
808 * are stored in the file-local buffer.
810 struct multi_transaction {
816 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
817 /* TODO: replace with per file lock */
818 static DEFINE_SPINLOCK(multi_transaction_lock);
820 static void multi_transaction_kref(struct kref *kref)
822 struct multi_transaction *t;
824 t = container_of(kref, struct multi_transaction, count);
825 free_page((unsigned long) t);
828 static struct multi_transaction *
829 get_multi_transaction(struct multi_transaction *t)
832 kref_get(&(t->count));
837 static void put_multi_transaction(struct multi_transaction *t)
840 kref_put(&(t->count), multi_transaction_kref);
843 /* does not increment @new's count */
844 static void multi_transaction_set(struct file *file,
845 struct multi_transaction *new, size_t n)
847 struct multi_transaction *old;
849 AA_BUG(n > MULTI_TRANSACTION_LIMIT);
852 spin_lock(&multi_transaction_lock);
853 old = (struct multi_transaction *) file->private_data;
854 file->private_data = new;
855 spin_unlock(&multi_transaction_lock);
856 put_multi_transaction(old);
859 static struct multi_transaction *multi_transaction_new(struct file *file,
860 const char __user *buf,
863 struct multi_transaction *t;
865 if (size > MULTI_TRANSACTION_LIMIT - 1)
866 return ERR_PTR(-EFBIG);
868 t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
870 return ERR_PTR(-ENOMEM);
871 kref_init(&t->count);
872 if (copy_from_user(t->data, buf, size))
873 return ERR_PTR(-EFAULT);
878 static ssize_t multi_transaction_read(struct file *file, char __user *buf,
879 size_t size, loff_t *pos)
881 struct multi_transaction *t;
884 spin_lock(&multi_transaction_lock);
885 t = get_multi_transaction(file->private_data);
886 spin_unlock(&multi_transaction_lock);
890 ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
891 put_multi_transaction(t);
896 static int multi_transaction_release(struct inode *inode, struct file *file)
898 put_multi_transaction(file->private_data);
903 #define QUERY_CMD_LABEL "label\0"
904 #define QUERY_CMD_LABEL_LEN 6
905 #define QUERY_CMD_PROFILE "profile\0"
906 #define QUERY_CMD_PROFILE_LEN 8
907 #define QUERY_CMD_LABELALL "labelall\0"
908 #define QUERY_CMD_LABELALL_LEN 9
909 #define QUERY_CMD_DATA "data\0"
910 #define QUERY_CMD_DATA_LEN 5
913 * aa_write_access - generic permissions and data query
914 * @file: pointer to open apparmorfs/access file
915 * @ubuf: user buffer containing the complete query string (NOT NULL)
916 * @count: size of ubuf
917 * @ppos: position in the file (MUST BE ZERO)
919 * Allows for one permissions or data query per open(), write(), and read()
920 * sequence. The only queries currently supported are label-based queries for
921 * permissions or data.
923 * For permissions queries, ubuf must begin with "label\0", followed by the
924 * profile query specific format described in the query_label() function
927 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
928 * <LABEL> is the name of the security confinement context and <KEY> is the
929 * name of the data to retrieve.
931 * Returns: number of bytes written or -errno on failure
933 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
934 size_t count, loff_t *ppos)
936 struct multi_transaction *t;
942 t = multi_transaction_new(file, ubuf, count);
946 if (count > QUERY_CMD_PROFILE_LEN &&
947 !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
948 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
949 t->data + QUERY_CMD_PROFILE_LEN,
950 count - QUERY_CMD_PROFILE_LEN, true);
951 } else if (count > QUERY_CMD_LABEL_LEN &&
952 !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
953 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
954 t->data + QUERY_CMD_LABEL_LEN,
955 count - QUERY_CMD_LABEL_LEN, true);
956 } else if (count > QUERY_CMD_LABELALL_LEN &&
957 !memcmp(t->data, QUERY_CMD_LABELALL,
958 QUERY_CMD_LABELALL_LEN)) {
959 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
960 t->data + QUERY_CMD_LABELALL_LEN,
961 count - QUERY_CMD_LABELALL_LEN, false);
962 } else if (count > QUERY_CMD_DATA_LEN &&
963 !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
964 len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
965 t->data + QUERY_CMD_DATA_LEN,
966 count - QUERY_CMD_DATA_LEN);
971 put_multi_transaction(t);
975 multi_transaction_set(file, t, len);
980 static const struct file_operations aa_sfs_access = {
981 .write = aa_write_access,
982 .read = multi_transaction_read,
983 .release = multi_transaction_release,
984 .llseek = generic_file_llseek,
987 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
989 struct aa_sfs_entry *fs_file = seq->private;
994 switch (fs_file->v_type) {
995 case AA_SFS_TYPE_BOOLEAN:
996 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
998 case AA_SFS_TYPE_STRING:
999 seq_printf(seq, "%s\n", fs_file->v.string);
1001 case AA_SFS_TYPE_U64:
1002 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1005 /* Ignore unpritable entry types. */
1012 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1014 return single_open(file, aa_sfs_seq_show, inode->i_private);
1017 const struct file_operations aa_sfs_seq_file_ops = {
1018 .owner = THIS_MODULE,
1019 .open = aa_sfs_seq_open,
1021 .llseek = seq_lseek,
1022 .release = single_release,
1026 * profile based file operations
1027 * policy/profiles/XXXX/profiles/ *
1030 #define SEQ_PROFILE_FOPS(NAME) \
1031 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1033 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1036 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1037 .owner = THIS_MODULE, \
1038 .open = seq_profile_ ##NAME ##_open, \
1040 .llseek = seq_lseek, \
1041 .release = seq_profile_release, \
1044 static int seq_profile_open(struct inode *inode, struct file *file,
1045 int (*show)(struct seq_file *, void *))
1047 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1048 int error = single_open(file, show, proxy);
1051 file->private_data = NULL;
1052 aa_put_proxy(proxy);
1058 static int seq_profile_release(struct inode *inode, struct file *file)
1060 struct seq_file *seq = (struct seq_file *) file->private_data;
1062 aa_put_proxy(seq->private);
1063 return single_release(inode, file);
1066 static int seq_profile_name_show(struct seq_file *seq, void *v)
1068 struct aa_proxy *proxy = seq->private;
1069 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1070 struct aa_profile *profile = labels_profile(label);
1071 seq_printf(seq, "%s\n", profile->base.name);
1072 aa_put_label(label);
1077 static int seq_profile_mode_show(struct seq_file *seq, void *v)
1079 struct aa_proxy *proxy = seq->private;
1080 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1081 struct aa_profile *profile = labels_profile(label);
1082 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1083 aa_put_label(label);
1088 static int seq_profile_attach_show(struct seq_file *seq, void *v)
1090 struct aa_proxy *proxy = seq->private;
1091 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1092 struct aa_profile *profile = labels_profile(label);
1093 if (profile->attach)
1094 seq_printf(seq, "%s\n", profile->attach);
1095 else if (profile->xmatch)
1096 seq_puts(seq, "<unknown>\n");
1098 seq_printf(seq, "%s\n", profile->base.name);
1099 aa_put_label(label);
1104 static int seq_profile_hash_show(struct seq_file *seq, void *v)
1106 struct aa_proxy *proxy = seq->private;
1107 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1108 struct aa_profile *profile = labels_profile(label);
1109 unsigned int i, size = aa_hash_size();
1111 if (profile->hash) {
1112 for (i = 0; i < size; i++)
1113 seq_printf(seq, "%.2x", profile->hash[i]);
1114 seq_putc(seq, '\n');
1116 aa_put_label(label);
1121 SEQ_PROFILE_FOPS(name);
1122 SEQ_PROFILE_FOPS(mode);
1123 SEQ_PROFILE_FOPS(attach);
1124 SEQ_PROFILE_FOPS(hash);
1127 * namespace based files
1128 * several root files and
1132 #define SEQ_NS_FOPS(NAME) \
1133 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1135 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1138 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1139 .owner = THIS_MODULE, \
1140 .open = seq_ns_ ##NAME ##_open, \
1142 .llseek = seq_lseek, \
1143 .release = single_release, \
1146 static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1148 struct aa_label *label;
1150 label = begin_current_label_crit_section();
1151 seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
1152 end_current_label_crit_section(label);
1157 static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
1159 struct aa_label *label;
1160 struct aa_profile *profile;
1164 label = begin_current_label_crit_section();
1166 if (label->size > 1) {
1167 label_for_each(it, label, profile)
1168 if (profile->ns != labels_ns(label)) {
1174 seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
1175 end_current_label_crit_section(label);
1180 static int seq_ns_level_show(struct seq_file *seq, void *v)
1182 struct aa_label *label;
1184 label = begin_current_label_crit_section();
1185 seq_printf(seq, "%d\n", labels_ns(label)->level);
1186 end_current_label_crit_section(label);
1191 static int seq_ns_name_show(struct seq_file *seq, void *v)
1193 struct aa_label *label = begin_current_label_crit_section();
1194 seq_printf(seq, "%s\n", labels_ns(label)->base.name);
1195 end_current_label_crit_section(label);
1200 SEQ_NS_FOPS(stacked);
1201 SEQ_NS_FOPS(nsstacked);
1206 /* policy/raw_data/ * file ops */
1208 #define SEQ_RAWDATA_FOPS(NAME) \
1209 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1211 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1214 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1215 .owner = THIS_MODULE, \
1216 .open = seq_rawdata_ ##NAME ##_open, \
1218 .llseek = seq_lseek, \
1219 .release = seq_rawdata_release, \
1222 static int seq_rawdata_open(struct inode *inode, struct file *file,
1223 int (*show)(struct seq_file *, void *))
1225 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1229 /* lost race this ent is being reaped */
1232 error = single_open(file, show, data);
1234 AA_BUG(file->private_data &&
1235 ((struct seq_file *)file->private_data)->private);
1236 aa_put_loaddata(data);
1242 static int seq_rawdata_release(struct inode *inode, struct file *file)
1244 struct seq_file *seq = (struct seq_file *) file->private_data;
1247 aa_put_loaddata(seq->private);
1249 return single_release(inode, file);
1252 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1254 struct aa_loaddata *data = seq->private;
1256 seq_printf(seq, "v%d\n", data->abi);
1261 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1263 struct aa_loaddata *data = seq->private;
1265 seq_printf(seq, "%ld\n", data->revision);
1270 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1272 struct aa_loaddata *data = seq->private;
1273 unsigned int i, size = aa_hash_size();
1276 for (i = 0; i < size; i++)
1277 seq_printf(seq, "%.2x", data->hash[i]);
1278 seq_putc(seq, '\n');
1284 SEQ_RAWDATA_FOPS(abi);
1285 SEQ_RAWDATA_FOPS(revision);
1286 SEQ_RAWDATA_FOPS(hash);
1288 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1291 struct aa_loaddata *rawdata = file->private_data;
1293 return simple_read_from_buffer(buf, size, ppos, rawdata->data,
1297 static int rawdata_release(struct inode *inode, struct file *file)
1299 aa_put_loaddata(file->private_data);
1304 static int rawdata_open(struct inode *inode, struct file *file)
1306 if (!policy_view_capable(NULL))
1308 file->private_data = __aa_get_loaddata(inode->i_private);
1309 if (!file->private_data)
1310 /* lost race: this entry is being reaped */
1316 static const struct file_operations rawdata_fops = {
1317 .open = rawdata_open,
1318 .read = rawdata_read,
1319 .llseek = generic_file_llseek,
1320 .release = rawdata_release,
1323 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1327 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1328 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1329 /* no refcounts on i_private */
1330 aafs_remove(rawdata->dents[i]);
1331 rawdata->dents[i] = NULL;
1336 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1338 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1341 remove_rawdata_dents(rawdata);
1342 list_del_init(&rawdata->list);
1343 aa_put_ns(rawdata->ns);
1348 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1350 struct dentry *dent, *dir;
1354 AA_BUG(!mutex_is_locked(&ns->lock));
1355 AA_BUG(!ns_subdata_dir(ns));
1358 * just use ns revision dir was originally created at. This is
1359 * under ns->lock and if load is successful revision will be
1360 * bumped and is guaranteed to be unique
1362 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1366 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1368 /* ->name freed when rawdata freed */
1369 return PTR_ERR(dir);
1370 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1372 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1373 &seq_rawdata_abi_fops);
1376 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1378 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1379 &seq_rawdata_revision_fops);
1382 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1384 if (aa_g_hash_policy) {
1385 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1386 rawdata, &seq_rawdata_hash_fops);
1389 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1392 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1393 dir, rawdata, &rawdata_fops);
1396 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1397 d_inode(dent)->i_size = rawdata->size;
1399 rawdata->ns = aa_get_ns(ns);
1400 list_add(&rawdata->list, &ns->rawdata_list);
1401 /* no refcount on inode rawdata */
1406 remove_rawdata_dents(rawdata);
1408 return PTR_ERR(dent);
1411 /** fns to setup dynamic per profile/namespace files **/
1415 * Requires: @profile->ns->lock held
1417 void __aafs_profile_rmdir(struct aa_profile *profile)
1419 struct aa_profile *child;
1425 list_for_each_entry(child, &profile->base.profiles, base.list)
1426 __aafs_profile_rmdir(child);
1428 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1429 struct aa_proxy *proxy;
1430 if (!profile->dents[i])
1433 proxy = d_inode(profile->dents[i])->i_private;
1434 aafs_remove(profile->dents[i]);
1435 aa_put_proxy(proxy);
1436 profile->dents[i] = NULL;
1442 * Requires: @old->ns->lock held
1444 void __aafs_profile_migrate_dents(struct aa_profile *old,
1445 struct aa_profile *new)
1451 AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
1453 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1454 new->dents[i] = old->dents[i];
1456 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
1457 old->dents[i] = NULL;
1461 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1462 struct aa_profile *profile,
1463 const struct file_operations *fops)
1465 struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1466 struct dentry *dent;
1468 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1470 aa_put_proxy(proxy);
1475 static int profile_depth(struct aa_profile *profile)
1480 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1487 static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
1491 int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
1493 s = buffer = kmalloc(size, GFP_KERNEL);
1495 return ERR_PTR(-ENOMEM);
1497 for (; depth > 0; depth--) {
1498 strcpy(s, "../../");
1503 error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
1504 if (error >= size || error < 0) {
1506 return ERR_PTR(-ENAMETOOLONG);
1512 static void rawdata_link_cb(void *arg)
1517 static const char *rawdata_get_link_base(struct dentry *dentry,
1518 struct inode *inode,
1519 struct delayed_call *done,
1522 struct aa_proxy *proxy = inode->i_private;
1523 struct aa_label *label;
1524 struct aa_profile *profile;
1529 return ERR_PTR(-ECHILD);
1531 label = aa_get_label_rcu(&proxy->label);
1532 profile = labels_profile(label);
1533 depth = profile_depth(profile);
1534 target = gen_symlink_name(depth, profile->rawdata->name, name);
1535 aa_put_label(label);
1540 set_delayed_call(done, rawdata_link_cb, target);
1545 static const char *rawdata_get_link_sha1(struct dentry *dentry,
1546 struct inode *inode,
1547 struct delayed_call *done)
1549 return rawdata_get_link_base(dentry, inode, done, "sha1");
1552 static const char *rawdata_get_link_abi(struct dentry *dentry,
1553 struct inode *inode,
1554 struct delayed_call *done)
1556 return rawdata_get_link_base(dentry, inode, done, "abi");
1559 static const char *rawdata_get_link_data(struct dentry *dentry,
1560 struct inode *inode,
1561 struct delayed_call *done)
1563 return rawdata_get_link_base(dentry, inode, done, "raw_data");
1566 static const struct inode_operations rawdata_link_sha1_iops = {
1567 .get_link = rawdata_get_link_sha1,
1570 static const struct inode_operations rawdata_link_abi_iops = {
1571 .get_link = rawdata_get_link_abi,
1573 static const struct inode_operations rawdata_link_data_iops = {
1574 .get_link = rawdata_get_link_data,
1579 * Requires: @profile->ns->lock held
1581 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1583 struct aa_profile *child;
1584 struct dentry *dent = NULL, *dir;
1588 AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
1591 struct aa_profile *p;
1592 p = aa_deref_parent(profile);
1594 /* adding to parent that previously didn't have children */
1595 dent = aafs_create_dir("profiles", dent);
1598 prof_child_dir(p) = parent = dent;
1601 if (!profile->dirname) {
1603 len = mangle_name(profile->base.name, NULL);
1604 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1606 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1607 if (!profile->dirname) {
1612 mangle_name(profile->base.name, profile->dirname);
1613 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1616 dent = aafs_create_dir(profile->dirname, parent);
1619 prof_dir(profile) = dir = dent;
1621 dent = create_profile_file(dir, "name", profile,
1622 &seq_profile_name_fops);
1625 profile->dents[AAFS_PROF_NAME] = dent;
1627 dent = create_profile_file(dir, "mode", profile,
1628 &seq_profile_mode_fops);
1631 profile->dents[AAFS_PROF_MODE] = dent;
1633 dent = create_profile_file(dir, "attach", profile,
1634 &seq_profile_attach_fops);
1637 profile->dents[AAFS_PROF_ATTACH] = dent;
1639 if (profile->hash) {
1640 dent = create_profile_file(dir, "sha1", profile,
1641 &seq_profile_hash_fops);
1644 profile->dents[AAFS_PROF_HASH] = dent;
1647 if (profile->rawdata) {
1648 dent = aafs_create_symlink("raw_sha1", dir, NULL,
1649 profile->label.proxy,
1650 &rawdata_link_sha1_iops);
1653 aa_get_proxy(profile->label.proxy);
1654 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1656 dent = aafs_create_symlink("raw_abi", dir, NULL,
1657 profile->label.proxy,
1658 &rawdata_link_abi_iops);
1661 aa_get_proxy(profile->label.proxy);
1662 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1664 dent = aafs_create_symlink("raw_data", dir, NULL,
1665 profile->label.proxy,
1666 &rawdata_link_data_iops);
1669 aa_get_proxy(profile->label.proxy);
1670 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1673 list_for_each_entry(child, &profile->base.profiles, base.list) {
1674 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1682 error = PTR_ERR(dent);
1685 __aafs_profile_rmdir(profile);
1690 static int ns_mkdir_op(struct inode *dir, struct dentry *dentry, umode_t mode)
1692 struct aa_ns *ns, *parent;
1693 /* TODO: improve permission check */
1694 struct aa_label *label;
1697 label = begin_current_label_crit_section();
1698 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1699 end_current_label_crit_section(label);
1703 parent = aa_get_ns(dir->i_private);
1704 AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1706 /* we have to unlock and then relock to get locking order right
1710 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1711 mutex_lock_nested(&parent->lock, parent->level);
1712 inode_lock_nested(dir, I_MUTEX_PARENT);
1716 error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
1721 ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1724 error = PTR_ERR(ns);
1728 aa_put_ns(ns); /* list ref remains */
1731 simple_release_fs(&aafs_mnt, &aafs_count);
1733 mutex_unlock(&parent->lock);
1739 static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1741 struct aa_ns *ns, *parent;
1742 /* TODO: improve permission check */
1743 struct aa_label *label;
1746 label = begin_current_label_crit_section();
1747 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1748 end_current_label_crit_section(label);
1752 parent = aa_get_ns(dir->i_private);
1753 /* rmdir calls the generic securityfs functions to remove files
1754 * from the apparmor dir. It is up to the apparmor ns locking
1758 inode_unlock(dentry->d_inode);
1760 mutex_lock_nested(&parent->lock, parent->level);
1761 ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1762 dentry->d_name.len));
1767 AA_BUG(ns_dir(ns) != dentry);
1773 mutex_unlock(&parent->lock);
1774 inode_lock_nested(dir, I_MUTEX_PARENT);
1775 inode_lock(dentry->d_inode);
1781 static const struct inode_operations ns_dir_inode_operations = {
1782 .lookup = simple_lookup,
1783 .mkdir = ns_mkdir_op,
1784 .rmdir = ns_rmdir_op,
1787 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1789 struct aa_loaddata *ent, *tmp;
1791 AA_BUG(!mutex_is_locked(&ns->lock));
1793 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1794 __aa_fs_remove_rawdata(ent);
1799 * Requires: @ns->lock held
1801 void __aafs_ns_rmdir(struct aa_ns *ns)
1804 struct aa_profile *child;
1809 AA_BUG(!mutex_is_locked(&ns->lock));
1811 list_for_each_entry(child, &ns->base.profiles, base.list)
1812 __aafs_profile_rmdir(child);
1814 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1815 mutex_lock_nested(&sub->lock, sub->level);
1816 __aafs_ns_rmdir(sub);
1817 mutex_unlock(&sub->lock);
1820 __aa_fs_list_remove_rawdata(ns);
1822 if (ns_subns_dir(ns)) {
1823 sub = d_inode(ns_subns_dir(ns))->i_private;
1826 if (ns_subload(ns)) {
1827 sub = d_inode(ns_subload(ns))->i_private;
1830 if (ns_subreplace(ns)) {
1831 sub = d_inode(ns_subreplace(ns))->i_private;
1834 if (ns_subremove(ns)) {
1835 sub = d_inode(ns_subremove(ns))->i_private;
1838 if (ns_subrevision(ns)) {
1839 sub = d_inode(ns_subrevision(ns))->i_private;
1843 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1844 aafs_remove(ns->dents[i]);
1845 ns->dents[i] = NULL;
1849 /* assumes cleanup in caller */
1850 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1852 struct dentry *dent;
1857 dent = aafs_create_dir("profiles", dir);
1859 return PTR_ERR(dent);
1860 ns_subprofs_dir(ns) = dent;
1862 dent = aafs_create_dir("raw_data", dir);
1864 return PTR_ERR(dent);
1865 ns_subdata_dir(ns) = dent;
1867 dent = aafs_create_file("revision", 0444, dir, ns,
1868 &aa_fs_ns_revision_fops);
1870 return PTR_ERR(dent);
1872 ns_subrevision(ns) = dent;
1874 dent = aafs_create_file(".load", 0640, dir, ns,
1875 &aa_fs_profile_load);
1877 return PTR_ERR(dent);
1879 ns_subload(ns) = dent;
1881 dent = aafs_create_file(".replace", 0640, dir, ns,
1882 &aa_fs_profile_replace);
1884 return PTR_ERR(dent);
1886 ns_subreplace(ns) = dent;
1888 dent = aafs_create_file(".remove", 0640, dir, ns,
1889 &aa_fs_profile_remove);
1891 return PTR_ERR(dent);
1893 ns_subremove(ns) = dent;
1895 /* use create_dentry so we can supply private data */
1896 dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
1897 &ns_dir_inode_operations);
1899 return PTR_ERR(dent);
1901 ns_subns_dir(ns) = dent;
1907 * Requires: @ns->lock held
1909 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
1910 struct dentry *dent)
1913 struct aa_profile *child;
1919 AA_BUG(!mutex_is_locked(&ns->lock));
1922 name = ns->base.name;
1925 /* create ns dir if it doesn't already exist */
1926 dent = aafs_create_dir(name, parent);
1931 ns_dir(ns) = dir = dent;
1932 error = __aafs_ns_mkdir_entries(ns, dir);
1937 list_for_each_entry(child, &ns->base.profiles, base.list) {
1938 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
1944 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1945 mutex_lock_nested(&sub->lock, sub->level);
1946 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
1947 mutex_unlock(&sub->lock);
1955 error = PTR_ERR(dent);
1958 __aafs_ns_rmdir(ns);
1964 * __next_ns - find the next namespace to list
1965 * @root: root namespace to stop search at (NOT NULL)
1966 * @ns: current ns position (NOT NULL)
1968 * Find the next namespace from @ns under @root and handle all locking needed
1969 * while switching current namespace.
1971 * Returns: next namespace or NULL if at last namespace under @root
1972 * Requires: ns->parent->lock to be held
1973 * NOTE: will not unlock root->lock
1975 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
1977 struct aa_ns *parent, *next;
1981 AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
1983 /* is next namespace a child */
1984 if (!list_empty(&ns->sub_ns)) {
1985 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
1986 mutex_lock_nested(&next->lock, next->level);
1990 /* check if the next ns is a sibling, parent, gp, .. */
1991 parent = ns->parent;
1992 while (ns != root) {
1993 mutex_unlock(&ns->lock);
1994 next = list_next_entry(ns, base.list);
1995 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
1996 mutex_lock_nested(&next->lock, next->level);
2000 parent = parent->parent;
2007 * __first_profile - find the first profile in a namespace
2008 * @root: namespace that is root of profiles being displayed (NOT NULL)
2009 * @ns: namespace to start in (NOT NULL)
2011 * Returns: unrefcounted profile or NULL if no profile
2012 * Requires: profile->ns.lock to be held
2014 static struct aa_profile *__first_profile(struct aa_ns *root,
2018 AA_BUG(ns && !mutex_is_locked(&ns->lock));
2020 for (; ns; ns = __next_ns(root, ns)) {
2021 if (!list_empty(&ns->base.profiles))
2022 return list_first_entry(&ns->base.profiles,
2023 struct aa_profile, base.list);
2029 * __next_profile - step to the next profile in a profile tree
2030 * @profile: current profile in tree (NOT NULL)
2032 * Perform a depth first traversal on the profile tree in a namespace
2034 * Returns: next profile or NULL if done
2035 * Requires: profile->ns.lock to be held
2037 static struct aa_profile *__next_profile(struct aa_profile *p)
2039 struct aa_profile *parent;
2040 struct aa_ns *ns = p->ns;
2042 AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
2044 /* is next profile a child */
2045 if (!list_empty(&p->base.profiles))
2046 return list_first_entry(&p->base.profiles, typeof(*p),
2049 /* is next profile a sibling, parent sibling, gp, sibling, .. */
2050 parent = rcu_dereference_protected(p->parent,
2051 mutex_is_locked(&p->ns->lock));
2053 p = list_next_entry(p, base.list);
2054 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
2057 parent = rcu_dereference_protected(parent->parent,
2058 mutex_is_locked(&parent->ns->lock));
2061 /* is next another profile in the namespace */
2062 p = list_next_entry(p, base.list);
2063 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
2070 * next_profile - step to the next profile in where ever it may be
2071 * @root: root namespace (NOT NULL)
2072 * @profile: current profile (NOT NULL)
2074 * Returns: next profile or NULL if there isn't one
2076 static struct aa_profile *next_profile(struct aa_ns *root,
2077 struct aa_profile *profile)
2079 struct aa_profile *next = __next_profile(profile);
2083 /* finished all profiles in namespace move to next namespace */
2084 return __first_profile(root, __next_ns(root, profile->ns));
2088 * p_start - start a depth first traversal of profile tree
2089 * @f: seq_file to fill
2090 * @pos: current position
2092 * Returns: first profile under current namespace or NULL if none found
2094 * acquires first ns->lock
2096 static void *p_start(struct seq_file *f, loff_t *pos)
2098 struct aa_profile *profile = NULL;
2099 struct aa_ns *root = aa_get_current_ns();
2103 /* find the first profile */
2104 mutex_lock_nested(&root->lock, root->level);
2105 profile = __first_profile(root, root);
2107 /* skip to position */
2108 for (; profile && l > 0; l--)
2109 profile = next_profile(root, profile);
2115 * p_next - read the next profile entry
2116 * @f: seq_file to fill
2117 * @p: profile previously returned
2118 * @pos: current position
2120 * Returns: next profile after @p or NULL if none
2122 * may acquire/release locks in namespace tree as necessary
2124 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2126 struct aa_profile *profile = p;
2127 struct aa_ns *ns = f->private;
2130 return next_profile(ns, profile);
2134 * p_stop - stop depth first traversal
2135 * @f: seq_file we are filling
2136 * @p: the last profile writen
2138 * Release all locking done by p_start/p_next on namespace tree
2140 static void p_stop(struct seq_file *f, void *p)
2142 struct aa_profile *profile = p;
2143 struct aa_ns *root = f->private, *ns;
2146 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2147 mutex_unlock(&ns->lock);
2149 mutex_unlock(&root->lock);
2154 * seq_show_profile - show a profile entry
2155 * @f: seq_file to file
2156 * @p: current position (profile) (NOT NULL)
2158 * Returns: error on failure
2160 static int seq_show_profile(struct seq_file *f, void *p)
2162 struct aa_profile *profile = (struct aa_profile *)p;
2163 struct aa_ns *root = f->private;
2165 aa_label_seq_xprint(f, root, &profile->label,
2166 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2172 static const struct seq_operations aa_sfs_profiles_op = {
2176 .show = seq_show_profile,
2179 static int profiles_open(struct inode *inode, struct file *file)
2181 if (!policy_view_capable(NULL))
2184 return seq_open(file, &aa_sfs_profiles_op);
2187 static int profiles_release(struct inode *inode, struct file *file)
2189 return seq_release(inode, file);
2192 static const struct file_operations aa_sfs_profiles_fops = {
2193 .open = profiles_open,
2195 .llseek = seq_lseek,
2196 .release = profiles_release,
2200 /** Base file system setup **/
2201 static struct aa_sfs_entry aa_sfs_entry_file[] = {
2202 AA_SFS_FILE_STRING("mask",
2203 "create read write exec append mmap_exec link lock"),
2207 static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2208 AA_SFS_FILE_STRING("mask", "read trace"),
2212 static struct aa_sfs_entry aa_sfs_entry_signal[] = {
2213 AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
2217 static struct aa_sfs_entry aa_sfs_entry_attach[] = {
2218 AA_SFS_FILE_BOOLEAN("xattr", 1),
2221 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2222 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2223 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2224 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2225 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2226 AA_SFS_FILE_BOOLEAN("stack", 1),
2227 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2228 AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1),
2229 AA_SFS_FILE_BOOLEAN("computed_longest_left", 1),
2230 AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach),
2231 AA_SFS_FILE_STRING("version", "1.2"),
2235 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2236 AA_SFS_FILE_BOOLEAN("v5", 1),
2237 AA_SFS_FILE_BOOLEAN("v6", 1),
2238 AA_SFS_FILE_BOOLEAN("v7", 1),
2239 AA_SFS_FILE_BOOLEAN("v8", 1),
2243 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2244 AA_SFS_DIR("versions", aa_sfs_entry_versions),
2245 AA_SFS_FILE_BOOLEAN("set_load", 1),
2249 static struct aa_sfs_entry aa_sfs_entry_mount[] = {
2250 AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
2254 static struct aa_sfs_entry aa_sfs_entry_ns[] = {
2255 AA_SFS_FILE_BOOLEAN("profile", 1),
2256 AA_SFS_FILE_BOOLEAN("pivot_root", 0),
2260 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2261 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2262 AA_SFS_FILE_BOOLEAN("data", 1),
2263 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2267 static struct aa_sfs_entry aa_sfs_entry_query[] = {
2268 AA_SFS_DIR("label", aa_sfs_entry_query_label),
2271 static struct aa_sfs_entry aa_sfs_entry_features[] = {
2272 AA_SFS_DIR("policy", aa_sfs_entry_policy),
2273 AA_SFS_DIR("domain", aa_sfs_entry_domain),
2274 AA_SFS_DIR("file", aa_sfs_entry_file),
2275 AA_SFS_DIR("network_v8", aa_sfs_entry_network),
2276 AA_SFS_DIR("mount", aa_sfs_entry_mount),
2277 AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
2278 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
2279 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
2280 AA_SFS_DIR("caps", aa_sfs_entry_caps),
2281 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
2282 AA_SFS_DIR("signal", aa_sfs_entry_signal),
2283 AA_SFS_DIR("query", aa_sfs_entry_query),
2287 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2288 AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
2289 AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
2290 AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
2291 AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
2292 AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
2293 AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
2294 AA_SFS_DIR("features", aa_sfs_entry_features),
2298 static struct aa_sfs_entry aa_sfs_entry =
2299 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2302 * entry_create_file - create a file entry in the apparmor securityfs
2303 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2304 * @parent: the parent dentry in the securityfs
2306 * Use entry_remove_file to remove entries created with this fn.
2308 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2309 struct dentry *parent)
2313 fs_file->dentry = securityfs_create_file(fs_file->name,
2314 S_IFREG | fs_file->mode,
2317 if (IS_ERR(fs_file->dentry)) {
2318 error = PTR_ERR(fs_file->dentry);
2319 fs_file->dentry = NULL;
2324 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2326 * entry_create_dir - recursively create a directory entry in the securityfs
2327 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2328 * @parent: the parent dentry in the securityfs
2330 * Use entry_remove_dir to remove entries created with this fn.
2332 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2333 struct dentry *parent)
2335 struct aa_sfs_entry *fs_file;
2339 dir = securityfs_create_dir(fs_dir->name, parent);
2341 return PTR_ERR(dir);
2342 fs_dir->dentry = dir;
2344 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2345 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2346 error = entry_create_dir(fs_file, fs_dir->dentry);
2348 error = entry_create_file(fs_file, fs_dir->dentry);
2356 entry_remove_dir(fs_dir);
2362 * entry_remove_file - drop a single file entry in the apparmor securityfs
2363 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2365 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2367 if (!fs_file->dentry)
2370 securityfs_remove(fs_file->dentry);
2371 fs_file->dentry = NULL;
2375 * entry_remove_dir - recursively drop a directory entry from the securityfs
2376 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2378 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2380 struct aa_sfs_entry *fs_file;
2382 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2383 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2384 entry_remove_dir(fs_file);
2386 entry_remove_file(fs_file);
2389 entry_remove_file(fs_dir);
2393 * aa_destroy_aafs - cleanup and free aafs
2395 * releases dentries allocated by aa_create_aafs
2397 void __init aa_destroy_aafs(void)
2399 entry_remove_dir(&aa_sfs_entry);
2403 #define NULL_FILE_NAME ".null"
2404 struct path aa_null;
2406 static int aa_mk_null_file(struct dentry *parent)
2408 struct vfsmount *mount = NULL;
2409 struct dentry *dentry;
2410 struct inode *inode;
2412 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2417 inode_lock(d_inode(parent));
2418 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2419 if (IS_ERR(dentry)) {
2420 error = PTR_ERR(dentry);
2423 inode = new_inode(parent->d_inode->i_sb);
2429 inode->i_ino = get_next_ino();
2430 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2431 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
2432 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2433 MKDEV(MEM_MAJOR, 3));
2434 d_instantiate(dentry, inode);
2435 aa_null.dentry = dget(dentry);
2436 aa_null.mnt = mntget(mount);
2443 inode_unlock(d_inode(parent));
2444 simple_release_fs(&mount, &count);
2450 static const char *policy_get_link(struct dentry *dentry,
2451 struct inode *inode,
2452 struct delayed_call *done)
2458 return ERR_PTR(-ECHILD);
2459 ns = aa_get_current_ns();
2460 path.mnt = mntget(aafs_mnt);
2461 path.dentry = dget(ns_dir(ns));
2462 nd_jump_link(&path);
2468 static int policy_readlink(struct dentry *dentry, char __user *buffer,
2474 res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
2475 d_inode(dentry)->i_ino);
2476 if (res > 0 && res < sizeof(name))
2477 res = readlink_copy(buffer, buflen, name);
2484 static const struct inode_operations policy_link_iops = {
2485 .readlink = policy_readlink,
2486 .get_link = policy_get_link,
2491 * aa_create_aafs - create the apparmor security filesystem
2493 * dentries created here are released by aa_destroy_aafs
2495 * Returns: error on failure
2497 static int __init aa_create_aafs(void)
2499 struct dentry *dent;
2502 if (!apparmor_initialized)
2505 if (aa_sfs_entry.dentry) {
2506 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2510 /* setup apparmorfs used to virtualize policy/ */
2511 aafs_mnt = kern_mount(&aafs_ops);
2512 if (IS_ERR(aafs_mnt))
2513 panic("can't set apparmorfs up\n");
2514 aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
2516 /* Populate fs tree. */
2517 error = entry_create_dir(&aa_sfs_entry, NULL);
2521 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2522 NULL, &aa_fs_profile_load);
2525 ns_subload(root_ns) = dent;
2527 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2528 NULL, &aa_fs_profile_replace);
2531 ns_subreplace(root_ns) = dent;
2533 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2534 NULL, &aa_fs_profile_remove);
2537 ns_subremove(root_ns) = dent;
2539 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2540 NULL, &aa_fs_ns_revision_fops);
2543 ns_subrevision(root_ns) = dent;
2545 /* policy tree referenced by magic policy symlink */
2546 mutex_lock_nested(&root_ns->lock, root_ns->level);
2547 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2548 aafs_mnt->mnt_root);
2549 mutex_unlock(&root_ns->lock);
2553 /* magic symlink similar to nsfs redirects based on task policy */
2554 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2555 NULL, &policy_link_iops);
2559 error = aa_mk_null_file(aa_sfs_entry.dentry);
2563 /* TODO: add default profile to apparmorfs */
2565 /* Report that AppArmor fs is enabled */
2566 aa_info_message("AppArmor Filesystem Enabled");
2570 error = PTR_ERR(dent);
2573 AA_ERROR("Error creating AppArmor securityfs\n");
2577 fs_initcall(aa_create_aafs);