1 // SPDX-License-Identifier: GPL-2.0-only
3 * AppArmor security module
5 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
11 #include <linux/ctype.h>
12 #include <linux/security.h>
13 #include <linux/vmalloc.h>
14 #include <linux/init.h>
15 #include <linux/seq_file.h>
16 #include <linux/uaccess.h>
17 #include <linux/mount.h>
18 #include <linux/namei.h>
19 #include <linux/capability.h>
20 #include <linux/rcupdate.h>
22 #include <linux/fs_context.h>
23 #include <linux/poll.h>
24 #include <linux/zlib.h>
25 #include <uapi/linux/major.h>
26 #include <uapi/linux/magic.h>
28 #include "include/apparmor.h"
29 #include "include/apparmorfs.h"
30 #include "include/audit.h"
31 #include "include/cred.h"
32 #include "include/crypto.h"
33 #include "include/ipc.h"
34 #include "include/label.h"
35 #include "include/policy.h"
36 #include "include/policy_ns.h"
37 #include "include/resource.h"
38 #include "include/policy_unpack.h"
41 * The apparmor filesystem interface used for policy load and introspection
42 * The interface is split into two main components based on their function
43 * a securityfs component:
44 * used for static files that are always available, and which allows
45 * userspace to specificy the location of the security filesystem.
47 * fns and data are prefixed with
50 * an apparmorfs component:
51 * used loaded policy content and introspection. It is not part of a
52 * regular mounted filesystem and is available only through the magic
53 * policy symlink in the root of the securityfs apparmor/ directory.
54 * Tasks queries will be magically redirected to the correct portion
55 * of the policy tree based on their confinement.
57 * fns and data are prefixed with
60 * The aa_fs_ prefix is used to indicate the fn is used by both the
61 * securityfs and apparmorfs filesystems.
69 struct rawdata_f_data {
70 struct aa_loaddata *loaddata;
73 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
74 #define RAWDATA_F_DATA_BUF(p) (char *)(p + 1)
76 static void rawdata_f_data_free(struct rawdata_f_data *private)
81 aa_put_loaddata(private->loaddata);
85 static struct rawdata_f_data *rawdata_f_data_alloc(size_t size)
87 struct rawdata_f_data *ret;
89 if (size > SIZE_MAX - sizeof(*ret))
90 return ERR_PTR(-EINVAL);
92 ret = kvzalloc(sizeof(*ret) + size, GFP_KERNEL);
94 return ERR_PTR(-ENOMEM);
101 * mangle_name - mangle a profile name to std profile layout form
102 * @name: profile name to mangle (NOT NULL)
103 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
105 * Returns: length of mangled name
107 static int mangle_name(const char *name, char *target)
111 while (*name == '/' || *name == '.')
115 for (; *name; name++) {
118 else if (isspace(*name))
120 else if (isalnum(*name) || strchr("._-", *name))
127 for (; *name; name++) {
128 if (isalnum(*name) || isspace(*name) ||
129 strchr("/._-", *name))
141 * aafs - core fns and data for the policy tree
144 #define AAFS_NAME "apparmorfs"
145 static struct vfsmount *aafs_mnt;
146 static int aafs_count;
149 static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
151 seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino);
155 static void aafs_free_inode(struct inode *inode)
157 if (S_ISLNK(inode->i_mode))
158 kfree(inode->i_link);
159 free_inode_nonrcu(inode);
162 static const struct super_operations aafs_super_ops = {
163 .statfs = simple_statfs,
164 .free_inode = aafs_free_inode,
165 .show_path = aafs_show_path,
168 static int apparmorfs_fill_super(struct super_block *sb, struct fs_context *fc)
170 static struct tree_descr files[] = { {""} };
173 error = simple_fill_super(sb, AAFS_MAGIC, files);
176 sb->s_op = &aafs_super_ops;
181 static int apparmorfs_get_tree(struct fs_context *fc)
183 return get_tree_single(fc, apparmorfs_fill_super);
186 static const struct fs_context_operations apparmorfs_context_ops = {
187 .get_tree = apparmorfs_get_tree,
190 static int apparmorfs_init_fs_context(struct fs_context *fc)
192 fc->ops = &apparmorfs_context_ops;
196 static struct file_system_type aafs_ops = {
197 .owner = THIS_MODULE,
199 .init_fs_context = apparmorfs_init_fs_context,
200 .kill_sb = kill_anon_super,
204 * __aafs_setup_d_inode - basic inode setup for apparmorfs
205 * @dir: parent directory for the dentry
206 * @dentry: dentry we are seting the inode up for
207 * @mode: permissions the file should have
208 * @data: data to store on inode.i_private, available in open()
209 * @link: if symlink, symlink target string
210 * @fops: struct file_operations that should be used
211 * @iops: struct of inode_operations that should be used
213 static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
214 umode_t mode, void *data, char *link,
215 const struct file_operations *fops,
216 const struct inode_operations *iops)
218 struct inode *inode = new_inode(dir->i_sb);
226 inode->i_ino = get_next_ino();
227 inode->i_mode = mode;
228 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
229 inode->i_private = data;
231 inode->i_op = iops ? iops : &simple_dir_inode_operations;
232 inode->i_fop = &simple_dir_operations;
235 } else if (S_ISLNK(mode)) {
236 inode->i_op = iops ? iops : &simple_symlink_inode_operations;
237 inode->i_link = link;
241 d_instantiate(dentry, inode);
248 * aafs_create - create a dentry in the apparmorfs filesystem
250 * @name: name of dentry to create
251 * @mode: permissions the file should have
252 * @parent: parent directory for this dentry
253 * @data: data to store on inode.i_private, available in open()
254 * @link: if symlink, symlink target string
255 * @fops: struct file_operations that should be used for
256 * @iops: struct of inode_operations that should be used
258 * This is the basic "create a xxx" function for apparmorfs.
260 * Returns a pointer to a dentry if it succeeds, that must be free with
261 * aafs_remove(). Will return ERR_PTR on failure.
263 static struct dentry *aafs_create(const char *name, umode_t mode,
264 struct dentry *parent, void *data, void *link,
265 const struct file_operations *fops,
266 const struct inode_operations *iops)
268 struct dentry *dentry;
275 if (!(mode & S_IFMT))
276 mode = (mode & S_IALLUGO) | S_IFREG;
278 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
280 return ERR_PTR(error);
282 dir = d_inode(parent);
285 dentry = lookup_one_len(name, parent, strlen(name));
286 if (IS_ERR(dentry)) {
287 error = PTR_ERR(dentry);
291 if (d_really_is_positive(dentry)) {
296 error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
308 simple_release_fs(&aafs_mnt, &aafs_count);
310 return ERR_PTR(error);
314 * aafs_create_file - create a file in the apparmorfs filesystem
316 * @name: name of dentry to create
317 * @mode: permissions the file should have
318 * @parent: parent directory for this dentry
319 * @data: data to store on inode.i_private, available in open()
320 * @fops: struct file_operations that should be used for
324 static struct dentry *aafs_create_file(const char *name, umode_t mode,
325 struct dentry *parent, void *data,
326 const struct file_operations *fops)
328 return aafs_create(name, mode, parent, data, NULL, fops, NULL);
332 * aafs_create_dir - create a directory in the apparmorfs filesystem
334 * @name: name of dentry to create
335 * @parent: parent directory for this dentry
339 static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
341 return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, 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)) {
406 aa_put_loaddata(data);
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, READ_ONCE(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))
818 static void multi_transaction_kref(struct kref *kref)
820 struct multi_transaction *t;
822 t = container_of(kref, struct multi_transaction, count);
823 free_page((unsigned long) t);
826 static struct multi_transaction *
827 get_multi_transaction(struct multi_transaction *t)
830 kref_get(&(t->count));
835 static void put_multi_transaction(struct multi_transaction *t)
838 kref_put(&(t->count), multi_transaction_kref);
841 /* does not increment @new's count */
842 static void multi_transaction_set(struct file *file,
843 struct multi_transaction *new, size_t n)
845 struct multi_transaction *old;
847 AA_BUG(n > MULTI_TRANSACTION_LIMIT);
850 spin_lock(&file->f_lock);
851 old = (struct multi_transaction *) file->private_data;
852 file->private_data = new;
853 spin_unlock(&file->f_lock);
854 put_multi_transaction(old);
857 static struct multi_transaction *multi_transaction_new(struct file *file,
858 const char __user *buf,
861 struct multi_transaction *t;
863 if (size > MULTI_TRANSACTION_LIMIT - 1)
864 return ERR_PTR(-EFBIG);
866 t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
868 return ERR_PTR(-ENOMEM);
869 kref_init(&t->count);
870 if (copy_from_user(t->data, buf, size))
871 return ERR_PTR(-EFAULT);
876 static ssize_t multi_transaction_read(struct file *file, char __user *buf,
877 size_t size, loff_t *pos)
879 struct multi_transaction *t;
882 spin_lock(&file->f_lock);
883 t = get_multi_transaction(file->private_data);
884 spin_unlock(&file->f_lock);
889 ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
890 put_multi_transaction(t);
895 static int multi_transaction_release(struct inode *inode, struct file *file)
897 put_multi_transaction(file->private_data);
902 #define QUERY_CMD_LABEL "label\0"
903 #define QUERY_CMD_LABEL_LEN 6
904 #define QUERY_CMD_PROFILE "profile\0"
905 #define QUERY_CMD_PROFILE_LEN 8
906 #define QUERY_CMD_LABELALL "labelall\0"
907 #define QUERY_CMD_LABELALL_LEN 9
908 #define QUERY_CMD_DATA "data\0"
909 #define QUERY_CMD_DATA_LEN 5
912 * aa_write_access - generic permissions and data query
913 * @file: pointer to open apparmorfs/access file
914 * @ubuf: user buffer containing the complete query string (NOT NULL)
915 * @count: size of ubuf
916 * @ppos: position in the file (MUST BE ZERO)
918 * Allows for one permissions or data query per open(), write(), and read()
919 * sequence. The only queries currently supported are label-based queries for
920 * permissions or data.
922 * For permissions queries, ubuf must begin with "label\0", followed by the
923 * profile query specific format described in the query_label() function
926 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
927 * <LABEL> is the name of the security confinement context and <KEY> is the
928 * name of the data to retrieve.
930 * Returns: number of bytes written or -errno on failure
932 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
933 size_t count, loff_t *ppos)
935 struct multi_transaction *t;
941 t = multi_transaction_new(file, ubuf, count);
945 if (count > QUERY_CMD_PROFILE_LEN &&
946 !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
947 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
948 t->data + QUERY_CMD_PROFILE_LEN,
949 count - QUERY_CMD_PROFILE_LEN, true);
950 } else if (count > QUERY_CMD_LABEL_LEN &&
951 !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
952 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
953 t->data + QUERY_CMD_LABEL_LEN,
954 count - QUERY_CMD_LABEL_LEN, true);
955 } else if (count > QUERY_CMD_LABELALL_LEN &&
956 !memcmp(t->data, QUERY_CMD_LABELALL,
957 QUERY_CMD_LABELALL_LEN)) {
958 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
959 t->data + QUERY_CMD_LABELALL_LEN,
960 count - QUERY_CMD_LABELALL_LEN, false);
961 } else if (count > QUERY_CMD_DATA_LEN &&
962 !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
963 len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
964 t->data + QUERY_CMD_DATA_LEN,
965 count - QUERY_CMD_DATA_LEN);
970 put_multi_transaction(t);
974 multi_transaction_set(file, t, len);
979 static const struct file_operations aa_sfs_access = {
980 .write = aa_write_access,
981 .read = multi_transaction_read,
982 .release = multi_transaction_release,
983 .llseek = generic_file_llseek,
986 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
988 struct aa_sfs_entry *fs_file = seq->private;
993 switch (fs_file->v_type) {
994 case AA_SFS_TYPE_BOOLEAN:
995 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
997 case AA_SFS_TYPE_STRING:
998 seq_printf(seq, "%s\n", fs_file->v.string);
1000 case AA_SFS_TYPE_U64:
1001 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1004 /* Ignore unpritable entry types. */
1011 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1013 return single_open(file, aa_sfs_seq_show, inode->i_private);
1016 const struct file_operations aa_sfs_seq_file_ops = {
1017 .owner = THIS_MODULE,
1018 .open = aa_sfs_seq_open,
1020 .llseek = seq_lseek,
1021 .release = single_release,
1025 * profile based file operations
1026 * policy/profiles/XXXX/profiles/ *
1029 #define SEQ_PROFILE_FOPS(NAME) \
1030 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1032 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1035 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1036 .owner = THIS_MODULE, \
1037 .open = seq_profile_ ##NAME ##_open, \
1039 .llseek = seq_lseek, \
1040 .release = seq_profile_release, \
1043 static int seq_profile_open(struct inode *inode, struct file *file,
1044 int (*show)(struct seq_file *, void *))
1046 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1047 int error = single_open(file, show, proxy);
1050 file->private_data = NULL;
1051 aa_put_proxy(proxy);
1057 static int seq_profile_release(struct inode *inode, struct file *file)
1059 struct seq_file *seq = (struct seq_file *) file->private_data;
1061 aa_put_proxy(seq->private);
1062 return single_release(inode, file);
1065 static int seq_profile_name_show(struct seq_file *seq, void *v)
1067 struct aa_proxy *proxy = seq->private;
1068 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1069 struct aa_profile *profile = labels_profile(label);
1070 seq_printf(seq, "%s\n", profile->base.name);
1071 aa_put_label(label);
1076 static int seq_profile_mode_show(struct seq_file *seq, void *v)
1078 struct aa_proxy *proxy = seq->private;
1079 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1080 struct aa_profile *profile = labels_profile(label);
1081 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1082 aa_put_label(label);
1087 static int seq_profile_attach_show(struct seq_file *seq, void *v)
1089 struct aa_proxy *proxy = seq->private;
1090 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1091 struct aa_profile *profile = labels_profile(label);
1092 if (profile->attach)
1093 seq_printf(seq, "%s\n", profile->attach);
1094 else if (profile->xmatch)
1095 seq_puts(seq, "<unknown>\n");
1097 seq_printf(seq, "%s\n", profile->base.name);
1098 aa_put_label(label);
1103 static int seq_profile_hash_show(struct seq_file *seq, void *v)
1105 struct aa_proxy *proxy = seq->private;
1106 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1107 struct aa_profile *profile = labels_profile(label);
1108 unsigned int i, size = aa_hash_size();
1110 if (profile->hash) {
1111 for (i = 0; i < size; i++)
1112 seq_printf(seq, "%.2x", profile->hash[i]);
1113 seq_putc(seq, '\n');
1115 aa_put_label(label);
1120 SEQ_PROFILE_FOPS(name);
1121 SEQ_PROFILE_FOPS(mode);
1122 SEQ_PROFILE_FOPS(attach);
1123 SEQ_PROFILE_FOPS(hash);
1126 * namespace based files
1127 * several root files and
1131 #define SEQ_NS_FOPS(NAME) \
1132 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1134 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1137 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1138 .owner = THIS_MODULE, \
1139 .open = seq_ns_ ##NAME ##_open, \
1141 .llseek = seq_lseek, \
1142 .release = single_release, \
1145 static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1147 struct aa_label *label;
1149 label = begin_current_label_crit_section();
1150 seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
1151 end_current_label_crit_section(label);
1156 static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
1158 struct aa_label *label;
1159 struct aa_profile *profile;
1163 label = begin_current_label_crit_section();
1165 if (label->size > 1) {
1166 label_for_each(it, label, profile)
1167 if (profile->ns != labels_ns(label)) {
1173 seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
1174 end_current_label_crit_section(label);
1179 static int seq_ns_level_show(struct seq_file *seq, void *v)
1181 struct aa_label *label;
1183 label = begin_current_label_crit_section();
1184 seq_printf(seq, "%d\n", labels_ns(label)->level);
1185 end_current_label_crit_section(label);
1190 static int seq_ns_name_show(struct seq_file *seq, void *v)
1192 struct aa_label *label = begin_current_label_crit_section();
1193 seq_printf(seq, "%s\n", labels_ns(label)->base.name);
1194 end_current_label_crit_section(label);
1199 SEQ_NS_FOPS(stacked);
1200 SEQ_NS_FOPS(nsstacked);
1205 /* policy/raw_data/ * file ops */
1206 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1207 #define SEQ_RAWDATA_FOPS(NAME) \
1208 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1210 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1213 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1214 .owner = THIS_MODULE, \
1215 .open = seq_rawdata_ ##NAME ##_open, \
1217 .llseek = seq_lseek, \
1218 .release = seq_rawdata_release, \
1221 static int seq_rawdata_open(struct inode *inode, struct file *file,
1222 int (*show)(struct seq_file *, void *))
1224 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1228 /* lost race this ent is being reaped */
1231 error = single_open(file, show, data);
1233 AA_BUG(file->private_data &&
1234 ((struct seq_file *)file->private_data)->private);
1235 aa_put_loaddata(data);
1241 static int seq_rawdata_release(struct inode *inode, struct file *file)
1243 struct seq_file *seq = (struct seq_file *) file->private_data;
1246 aa_put_loaddata(seq->private);
1248 return single_release(inode, file);
1251 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1253 struct aa_loaddata *data = seq->private;
1255 seq_printf(seq, "v%d\n", data->abi);
1260 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1262 struct aa_loaddata *data = seq->private;
1264 seq_printf(seq, "%ld\n", data->revision);
1269 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1271 struct aa_loaddata *data = seq->private;
1272 unsigned int i, size = aa_hash_size();
1275 for (i = 0; i < size; i++)
1276 seq_printf(seq, "%.2x", data->hash[i]);
1277 seq_putc(seq, '\n');
1283 static int seq_rawdata_compressed_size_show(struct seq_file *seq, void *v)
1285 struct aa_loaddata *data = seq->private;
1287 seq_printf(seq, "%zu\n", data->compressed_size);
1292 SEQ_RAWDATA_FOPS(abi);
1293 SEQ_RAWDATA_FOPS(revision);
1294 SEQ_RAWDATA_FOPS(hash);
1295 SEQ_RAWDATA_FOPS(compressed_size);
1297 static int deflate_decompress(char *src, size_t slen, char *dst, size_t dlen)
1299 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1300 if (aa_g_rawdata_compression_level != 0) {
1302 struct z_stream_s strm;
1304 memset(&strm, 0, sizeof(strm));
1306 strm.workspace = kvzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
1307 if (!strm.workspace)
1311 strm.avail_in = slen;
1313 error = zlib_inflateInit(&strm);
1314 if (error != Z_OK) {
1316 goto fail_inflate_init;
1319 strm.next_out = dst;
1320 strm.avail_out = dlen;
1322 error = zlib_inflate(&strm, Z_FINISH);
1323 if (error != Z_STREAM_END)
1328 zlib_inflateEnd(&strm);
1330 kvfree(strm.workspace);
1338 memcpy(dst, src, slen);
1342 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1345 struct rawdata_f_data *private = file->private_data;
1347 return simple_read_from_buffer(buf, size, ppos,
1348 RAWDATA_F_DATA_BUF(private),
1349 private->loaddata->size);
1352 static int rawdata_release(struct inode *inode, struct file *file)
1354 rawdata_f_data_free(file->private_data);
1359 static int rawdata_open(struct inode *inode, struct file *file)
1362 struct aa_loaddata *loaddata;
1363 struct rawdata_f_data *private;
1365 if (!aa_current_policy_view_capable(NULL))
1368 loaddata = __aa_get_loaddata(inode->i_private);
1370 /* lost race: this entry is being reaped */
1373 private = rawdata_f_data_alloc(loaddata->size);
1374 if (IS_ERR(private)) {
1375 error = PTR_ERR(private);
1376 goto fail_private_alloc;
1379 private->loaddata = loaddata;
1381 error = deflate_decompress(loaddata->data, loaddata->compressed_size,
1382 RAWDATA_F_DATA_BUF(private),
1385 goto fail_decompress;
1387 file->private_data = private;
1391 rawdata_f_data_free(private);
1395 aa_put_loaddata(loaddata);
1399 static const struct file_operations rawdata_fops = {
1400 .open = rawdata_open,
1401 .read = rawdata_read,
1402 .llseek = generic_file_llseek,
1403 .release = rawdata_release,
1406 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1410 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1411 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1412 /* no refcounts on i_private */
1413 aafs_remove(rawdata->dents[i]);
1414 rawdata->dents[i] = NULL;
1419 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1421 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1424 remove_rawdata_dents(rawdata);
1425 list_del_init(&rawdata->list);
1426 aa_put_ns(rawdata->ns);
1431 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1433 struct dentry *dent, *dir;
1437 AA_BUG(!mutex_is_locked(&ns->lock));
1438 AA_BUG(!ns_subdata_dir(ns));
1441 * just use ns revision dir was originally created at. This is
1442 * under ns->lock and if load is successful revision will be
1443 * bumped and is guaranteed to be unique
1445 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1449 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1451 /* ->name freed when rawdata freed */
1452 return PTR_ERR(dir);
1453 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1455 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1456 &seq_rawdata_abi_fops);
1459 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1461 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1462 &seq_rawdata_revision_fops);
1465 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1467 if (aa_g_hash_policy) {
1468 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1469 rawdata, &seq_rawdata_hash_fops);
1472 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1475 dent = aafs_create_file("compressed_size", S_IFREG | 0444, dir,
1477 &seq_rawdata_compressed_size_fops);
1480 rawdata->dents[AAFS_LOADDATA_COMPRESSED_SIZE] = dent;
1482 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1483 dir, rawdata, &rawdata_fops);
1486 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1487 d_inode(dent)->i_size = rawdata->size;
1489 rawdata->ns = aa_get_ns(ns);
1490 list_add(&rawdata->list, &ns->rawdata_list);
1491 /* no refcount on inode rawdata */
1496 remove_rawdata_dents(rawdata);
1498 return PTR_ERR(dent);
1500 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1503 /** fns to setup dynamic per profile/namespace files **/
1507 * Requires: @profile->ns->lock held
1509 void __aafs_profile_rmdir(struct aa_profile *profile)
1511 struct aa_profile *child;
1517 list_for_each_entry(child, &profile->base.profiles, base.list)
1518 __aafs_profile_rmdir(child);
1520 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1521 struct aa_proxy *proxy;
1522 if (!profile->dents[i])
1525 proxy = d_inode(profile->dents[i])->i_private;
1526 aafs_remove(profile->dents[i]);
1527 aa_put_proxy(proxy);
1528 profile->dents[i] = NULL;
1534 * Requires: @old->ns->lock held
1536 void __aafs_profile_migrate_dents(struct aa_profile *old,
1537 struct aa_profile *new)
1543 AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
1545 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1546 new->dents[i] = old->dents[i];
1548 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
1549 old->dents[i] = NULL;
1553 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1554 struct aa_profile *profile,
1555 const struct file_operations *fops)
1557 struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1558 struct dentry *dent;
1560 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1562 aa_put_proxy(proxy);
1567 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1568 static int profile_depth(struct aa_profile *profile)
1573 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1580 static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
1584 int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
1586 s = buffer = kmalloc(size, GFP_KERNEL);
1588 return ERR_PTR(-ENOMEM);
1590 for (; depth > 0; depth--) {
1591 strcpy(s, "../../");
1596 error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
1597 if (error >= size || error < 0) {
1599 return ERR_PTR(-ENAMETOOLONG);
1605 static void rawdata_link_cb(void *arg)
1610 static const char *rawdata_get_link_base(struct dentry *dentry,
1611 struct inode *inode,
1612 struct delayed_call *done,
1615 struct aa_proxy *proxy = inode->i_private;
1616 struct aa_label *label;
1617 struct aa_profile *profile;
1622 return ERR_PTR(-ECHILD);
1624 label = aa_get_label_rcu(&proxy->label);
1625 profile = labels_profile(label);
1626 depth = profile_depth(profile);
1627 target = gen_symlink_name(depth, profile->rawdata->name, name);
1628 aa_put_label(label);
1633 set_delayed_call(done, rawdata_link_cb, target);
1638 static const char *rawdata_get_link_sha1(struct dentry *dentry,
1639 struct inode *inode,
1640 struct delayed_call *done)
1642 return rawdata_get_link_base(dentry, inode, done, "sha1");
1645 static const char *rawdata_get_link_abi(struct dentry *dentry,
1646 struct inode *inode,
1647 struct delayed_call *done)
1649 return rawdata_get_link_base(dentry, inode, done, "abi");
1652 static const char *rawdata_get_link_data(struct dentry *dentry,
1653 struct inode *inode,
1654 struct delayed_call *done)
1656 return rawdata_get_link_base(dentry, inode, done, "raw_data");
1659 static const struct inode_operations rawdata_link_sha1_iops = {
1660 .get_link = rawdata_get_link_sha1,
1663 static const struct inode_operations rawdata_link_abi_iops = {
1664 .get_link = rawdata_get_link_abi,
1666 static const struct inode_operations rawdata_link_data_iops = {
1667 .get_link = rawdata_get_link_data,
1669 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1672 * Requires: @profile->ns->lock held
1674 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1676 struct aa_profile *child;
1677 struct dentry *dent = NULL, *dir;
1681 AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
1684 struct aa_profile *p;
1685 p = aa_deref_parent(profile);
1687 /* adding to parent that previously didn't have children */
1688 dent = aafs_create_dir("profiles", dent);
1691 prof_child_dir(p) = parent = dent;
1694 if (!profile->dirname) {
1696 len = mangle_name(profile->base.name, NULL);
1697 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1699 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1700 if (!profile->dirname) {
1705 mangle_name(profile->base.name, profile->dirname);
1706 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1709 dent = aafs_create_dir(profile->dirname, parent);
1712 prof_dir(profile) = dir = dent;
1714 dent = create_profile_file(dir, "name", profile,
1715 &seq_profile_name_fops);
1718 profile->dents[AAFS_PROF_NAME] = dent;
1720 dent = create_profile_file(dir, "mode", profile,
1721 &seq_profile_mode_fops);
1724 profile->dents[AAFS_PROF_MODE] = dent;
1726 dent = create_profile_file(dir, "attach", profile,
1727 &seq_profile_attach_fops);
1730 profile->dents[AAFS_PROF_ATTACH] = dent;
1732 if (profile->hash) {
1733 dent = create_profile_file(dir, "sha1", profile,
1734 &seq_profile_hash_fops);
1737 profile->dents[AAFS_PROF_HASH] = dent;
1740 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1741 if (profile->rawdata) {
1742 if (aa_g_hash_policy) {
1743 dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir,
1744 profile->label.proxy, NULL, NULL,
1745 &rawdata_link_sha1_iops);
1748 aa_get_proxy(profile->label.proxy);
1749 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1751 dent = aafs_create("raw_abi", S_IFLNK | 0444, dir,
1752 profile->label.proxy, NULL, NULL,
1753 &rawdata_link_abi_iops);
1756 aa_get_proxy(profile->label.proxy);
1757 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1759 dent = aafs_create("raw_data", S_IFLNK | 0444, dir,
1760 profile->label.proxy, NULL, NULL,
1761 &rawdata_link_data_iops);
1764 aa_get_proxy(profile->label.proxy);
1765 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1767 #endif /*CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1769 list_for_each_entry(child, &profile->base.profiles, base.list) {
1770 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1778 error = PTR_ERR(dent);
1781 __aafs_profile_rmdir(profile);
1786 static int ns_mkdir_op(struct user_namespace *mnt_userns, struct inode *dir,
1787 struct dentry *dentry, umode_t mode)
1789 struct aa_ns *ns, *parent;
1790 /* TODO: improve permission check */
1791 struct aa_label *label;
1794 label = begin_current_label_crit_section();
1795 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1796 end_current_label_crit_section(label);
1800 parent = aa_get_ns(dir->i_private);
1801 AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1803 /* we have to unlock and then relock to get locking order right
1807 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1808 mutex_lock_nested(&parent->lock, parent->level);
1809 inode_lock_nested(dir, I_MUTEX_PARENT);
1813 error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
1818 ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1821 error = PTR_ERR(ns);
1825 aa_put_ns(ns); /* list ref remains */
1828 simple_release_fs(&aafs_mnt, &aafs_count);
1830 mutex_unlock(&parent->lock);
1836 static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1838 struct aa_ns *ns, *parent;
1839 /* TODO: improve permission check */
1840 struct aa_label *label;
1843 label = begin_current_label_crit_section();
1844 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1845 end_current_label_crit_section(label);
1849 parent = aa_get_ns(dir->i_private);
1850 /* rmdir calls the generic securityfs functions to remove files
1851 * from the apparmor dir. It is up to the apparmor ns locking
1855 inode_unlock(dentry->d_inode);
1857 mutex_lock_nested(&parent->lock, parent->level);
1858 ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1859 dentry->d_name.len));
1864 AA_BUG(ns_dir(ns) != dentry);
1870 mutex_unlock(&parent->lock);
1871 inode_lock_nested(dir, I_MUTEX_PARENT);
1872 inode_lock(dentry->d_inode);
1878 static const struct inode_operations ns_dir_inode_operations = {
1879 .lookup = simple_lookup,
1880 .mkdir = ns_mkdir_op,
1881 .rmdir = ns_rmdir_op,
1884 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1886 struct aa_loaddata *ent, *tmp;
1888 AA_BUG(!mutex_is_locked(&ns->lock));
1890 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1891 __aa_fs_remove_rawdata(ent);
1896 * Requires: @ns->lock held
1898 void __aafs_ns_rmdir(struct aa_ns *ns)
1901 struct aa_profile *child;
1906 AA_BUG(!mutex_is_locked(&ns->lock));
1908 list_for_each_entry(child, &ns->base.profiles, base.list)
1909 __aafs_profile_rmdir(child);
1911 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1912 mutex_lock_nested(&sub->lock, sub->level);
1913 __aafs_ns_rmdir(sub);
1914 mutex_unlock(&sub->lock);
1917 __aa_fs_list_remove_rawdata(ns);
1919 if (ns_subns_dir(ns)) {
1920 sub = d_inode(ns_subns_dir(ns))->i_private;
1923 if (ns_subload(ns)) {
1924 sub = d_inode(ns_subload(ns))->i_private;
1927 if (ns_subreplace(ns)) {
1928 sub = d_inode(ns_subreplace(ns))->i_private;
1931 if (ns_subremove(ns)) {
1932 sub = d_inode(ns_subremove(ns))->i_private;
1935 if (ns_subrevision(ns)) {
1936 sub = d_inode(ns_subrevision(ns))->i_private;
1940 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1941 aafs_remove(ns->dents[i]);
1942 ns->dents[i] = NULL;
1946 /* assumes cleanup in caller */
1947 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1949 struct dentry *dent;
1954 dent = aafs_create_dir("profiles", dir);
1956 return PTR_ERR(dent);
1957 ns_subprofs_dir(ns) = dent;
1959 dent = aafs_create_dir("raw_data", dir);
1961 return PTR_ERR(dent);
1962 ns_subdata_dir(ns) = dent;
1964 dent = aafs_create_file("revision", 0444, dir, ns,
1965 &aa_fs_ns_revision_fops);
1967 return PTR_ERR(dent);
1969 ns_subrevision(ns) = dent;
1971 dent = aafs_create_file(".load", 0640, dir, ns,
1972 &aa_fs_profile_load);
1974 return PTR_ERR(dent);
1976 ns_subload(ns) = dent;
1978 dent = aafs_create_file(".replace", 0640, dir, ns,
1979 &aa_fs_profile_replace);
1981 return PTR_ERR(dent);
1983 ns_subreplace(ns) = dent;
1985 dent = aafs_create_file(".remove", 0640, dir, ns,
1986 &aa_fs_profile_remove);
1988 return PTR_ERR(dent);
1990 ns_subremove(ns) = dent;
1992 /* use create_dentry so we can supply private data */
1993 dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
1994 &ns_dir_inode_operations);
1996 return PTR_ERR(dent);
1998 ns_subns_dir(ns) = dent;
2004 * Requires: @ns->lock held
2006 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
2007 struct dentry *dent)
2010 struct aa_profile *child;
2016 AA_BUG(!mutex_is_locked(&ns->lock));
2019 name = ns->base.name;
2022 /* create ns dir if it doesn't already exist */
2023 dent = aafs_create_dir(name, parent);
2028 ns_dir(ns) = dir = dent;
2029 error = __aafs_ns_mkdir_entries(ns, dir);
2034 list_for_each_entry(child, &ns->base.profiles, base.list) {
2035 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
2041 list_for_each_entry(sub, &ns->sub_ns, base.list) {
2042 mutex_lock_nested(&sub->lock, sub->level);
2043 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
2044 mutex_unlock(&sub->lock);
2052 error = PTR_ERR(dent);
2055 __aafs_ns_rmdir(ns);
2061 * __next_ns - find the next namespace to list
2062 * @root: root namespace to stop search at (NOT NULL)
2063 * @ns: current ns position (NOT NULL)
2065 * Find the next namespace from @ns under @root and handle all locking needed
2066 * while switching current namespace.
2068 * Returns: next namespace or NULL if at last namespace under @root
2069 * Requires: ns->parent->lock to be held
2070 * NOTE: will not unlock root->lock
2072 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
2074 struct aa_ns *parent, *next;
2078 AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
2080 /* is next namespace a child */
2081 if (!list_empty(&ns->sub_ns)) {
2082 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
2083 mutex_lock_nested(&next->lock, next->level);
2087 /* check if the next ns is a sibling, parent, gp, .. */
2088 parent = ns->parent;
2089 while (ns != root) {
2090 mutex_unlock(&ns->lock);
2091 next = list_next_entry(ns, base.list);
2092 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
2093 mutex_lock_nested(&next->lock, next->level);
2097 parent = parent->parent;
2104 * __first_profile - find the first profile in a namespace
2105 * @root: namespace that is root of profiles being displayed (NOT NULL)
2106 * @ns: namespace to start in (NOT NULL)
2108 * Returns: unrefcounted profile or NULL if no profile
2109 * Requires: profile->ns.lock to be held
2111 static struct aa_profile *__first_profile(struct aa_ns *root,
2115 AA_BUG(ns && !mutex_is_locked(&ns->lock));
2117 for (; ns; ns = __next_ns(root, ns)) {
2118 if (!list_empty(&ns->base.profiles))
2119 return list_first_entry(&ns->base.profiles,
2120 struct aa_profile, base.list);
2126 * __next_profile - step to the next profile in a profile tree
2127 * @p: current profile in tree (NOT NULL)
2129 * Perform a depth first traversal on the profile tree in a namespace
2131 * Returns: next profile or NULL if done
2132 * Requires: profile->ns.lock to be held
2134 static struct aa_profile *__next_profile(struct aa_profile *p)
2136 struct aa_profile *parent;
2137 struct aa_ns *ns = p->ns;
2139 AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
2141 /* is next profile a child */
2142 if (!list_empty(&p->base.profiles))
2143 return list_first_entry(&p->base.profiles, typeof(*p),
2146 /* is next profile a sibling, parent sibling, gp, sibling, .. */
2147 parent = rcu_dereference_protected(p->parent,
2148 mutex_is_locked(&p->ns->lock));
2150 p = list_next_entry(p, base.list);
2151 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
2154 parent = rcu_dereference_protected(parent->parent,
2155 mutex_is_locked(&parent->ns->lock));
2158 /* is next another profile in the namespace */
2159 p = list_next_entry(p, base.list);
2160 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
2167 * next_profile - step to the next profile in where ever it may be
2168 * @root: root namespace (NOT NULL)
2169 * @profile: current profile (NOT NULL)
2171 * Returns: next profile or NULL if there isn't one
2173 static struct aa_profile *next_profile(struct aa_ns *root,
2174 struct aa_profile *profile)
2176 struct aa_profile *next = __next_profile(profile);
2180 /* finished all profiles in namespace move to next namespace */
2181 return __first_profile(root, __next_ns(root, profile->ns));
2185 * p_start - start a depth first traversal of profile tree
2186 * @f: seq_file to fill
2187 * @pos: current position
2189 * Returns: first profile under current namespace or NULL if none found
2191 * acquires first ns->lock
2193 static void *p_start(struct seq_file *f, loff_t *pos)
2195 struct aa_profile *profile = NULL;
2196 struct aa_ns *root = aa_get_current_ns();
2200 /* find the first profile */
2201 mutex_lock_nested(&root->lock, root->level);
2202 profile = __first_profile(root, root);
2204 /* skip to position */
2205 for (; profile && l > 0; l--)
2206 profile = next_profile(root, profile);
2212 * p_next - read the next profile entry
2213 * @f: seq_file to fill
2214 * @p: profile previously returned
2215 * @pos: current position
2217 * Returns: next profile after @p or NULL if none
2219 * may acquire/release locks in namespace tree as necessary
2221 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2223 struct aa_profile *profile = p;
2224 struct aa_ns *ns = f->private;
2227 return next_profile(ns, profile);
2231 * p_stop - stop depth first traversal
2232 * @f: seq_file we are filling
2233 * @p: the last profile writen
2235 * Release all locking done by p_start/p_next on namespace tree
2237 static void p_stop(struct seq_file *f, void *p)
2239 struct aa_profile *profile = p;
2240 struct aa_ns *root = f->private, *ns;
2243 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2244 mutex_unlock(&ns->lock);
2246 mutex_unlock(&root->lock);
2251 * seq_show_profile - show a profile entry
2252 * @f: seq_file to file
2253 * @p: current position (profile) (NOT NULL)
2255 * Returns: error on failure
2257 static int seq_show_profile(struct seq_file *f, void *p)
2259 struct aa_profile *profile = (struct aa_profile *)p;
2260 struct aa_ns *root = f->private;
2262 aa_label_seq_xprint(f, root, &profile->label,
2263 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2269 static const struct seq_operations aa_sfs_profiles_op = {
2273 .show = seq_show_profile,
2276 static int profiles_open(struct inode *inode, struct file *file)
2278 if (!aa_current_policy_view_capable(NULL))
2281 return seq_open(file, &aa_sfs_profiles_op);
2284 static int profiles_release(struct inode *inode, struct file *file)
2286 return seq_release(inode, file);
2289 static const struct file_operations aa_sfs_profiles_fops = {
2290 .open = profiles_open,
2292 .llseek = seq_lseek,
2293 .release = profiles_release,
2297 /** Base file system setup **/
2298 static struct aa_sfs_entry aa_sfs_entry_file[] = {
2299 AA_SFS_FILE_STRING("mask",
2300 "create read write exec append mmap_exec link lock"),
2304 static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2305 AA_SFS_FILE_STRING("mask", "read trace"),
2309 static struct aa_sfs_entry aa_sfs_entry_signal[] = {
2310 AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
2314 static struct aa_sfs_entry aa_sfs_entry_attach[] = {
2315 AA_SFS_FILE_BOOLEAN("xattr", 1),
2318 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2319 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2320 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2321 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2322 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2323 AA_SFS_FILE_BOOLEAN("stack", 1),
2324 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2325 AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1),
2326 AA_SFS_FILE_BOOLEAN("computed_longest_left", 1),
2327 AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach),
2328 AA_SFS_FILE_STRING("version", "1.2"),
2332 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2333 AA_SFS_FILE_BOOLEAN("v5", 1),
2334 AA_SFS_FILE_BOOLEAN("v6", 1),
2335 AA_SFS_FILE_BOOLEAN("v7", 1),
2336 AA_SFS_FILE_BOOLEAN("v8", 1),
2337 AA_SFS_FILE_BOOLEAN("v9", 1),
2341 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2342 AA_SFS_DIR("versions", aa_sfs_entry_versions),
2343 AA_SFS_FILE_BOOLEAN("set_load", 1),
2344 /* number of out of band transitions supported */
2345 AA_SFS_FILE_U64("outofband", MAX_OOB_SUPPORTED),
2349 static struct aa_sfs_entry aa_sfs_entry_mount[] = {
2350 AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
2354 static struct aa_sfs_entry aa_sfs_entry_ns[] = {
2355 AA_SFS_FILE_BOOLEAN("profile", 1),
2356 AA_SFS_FILE_BOOLEAN("pivot_root", 0),
2360 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2361 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2362 AA_SFS_FILE_BOOLEAN("data", 1),
2363 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2367 static struct aa_sfs_entry aa_sfs_entry_query[] = {
2368 AA_SFS_DIR("label", aa_sfs_entry_query_label),
2371 static struct aa_sfs_entry aa_sfs_entry_features[] = {
2372 AA_SFS_DIR("policy", aa_sfs_entry_policy),
2373 AA_SFS_DIR("domain", aa_sfs_entry_domain),
2374 AA_SFS_DIR("file", aa_sfs_entry_file),
2375 AA_SFS_DIR("network_v8", aa_sfs_entry_network),
2376 AA_SFS_DIR("mount", aa_sfs_entry_mount),
2377 AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
2378 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
2379 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
2380 AA_SFS_DIR("caps", aa_sfs_entry_caps),
2381 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
2382 AA_SFS_DIR("signal", aa_sfs_entry_signal),
2383 AA_SFS_DIR("query", aa_sfs_entry_query),
2387 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2388 AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
2389 AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
2390 AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
2391 AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
2392 AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
2393 AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
2394 AA_SFS_DIR("features", aa_sfs_entry_features),
2398 static struct aa_sfs_entry aa_sfs_entry =
2399 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2402 * entry_create_file - create a file entry in the apparmor securityfs
2403 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2404 * @parent: the parent dentry in the securityfs
2406 * Use entry_remove_file to remove entries created with this fn.
2408 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2409 struct dentry *parent)
2413 fs_file->dentry = securityfs_create_file(fs_file->name,
2414 S_IFREG | fs_file->mode,
2417 if (IS_ERR(fs_file->dentry)) {
2418 error = PTR_ERR(fs_file->dentry);
2419 fs_file->dentry = NULL;
2424 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2426 * entry_create_dir - recursively create a directory entry in the securityfs
2427 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2428 * @parent: the parent dentry in the securityfs
2430 * Use entry_remove_dir to remove entries created with this fn.
2432 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2433 struct dentry *parent)
2435 struct aa_sfs_entry *fs_file;
2439 dir = securityfs_create_dir(fs_dir->name, parent);
2441 return PTR_ERR(dir);
2442 fs_dir->dentry = dir;
2444 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2445 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2446 error = entry_create_dir(fs_file, fs_dir->dentry);
2448 error = entry_create_file(fs_file, fs_dir->dentry);
2456 entry_remove_dir(fs_dir);
2462 * entry_remove_file - drop a single file entry in the apparmor securityfs
2463 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2465 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2467 if (!fs_file->dentry)
2470 securityfs_remove(fs_file->dentry);
2471 fs_file->dentry = NULL;
2475 * entry_remove_dir - recursively drop a directory entry from the securityfs
2476 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2478 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2480 struct aa_sfs_entry *fs_file;
2482 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2483 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2484 entry_remove_dir(fs_file);
2486 entry_remove_file(fs_file);
2489 entry_remove_file(fs_dir);
2493 * aa_destroy_aafs - cleanup and free aafs
2495 * releases dentries allocated by aa_create_aafs
2497 void __init aa_destroy_aafs(void)
2499 entry_remove_dir(&aa_sfs_entry);
2503 #define NULL_FILE_NAME ".null"
2504 struct path aa_null;
2506 static int aa_mk_null_file(struct dentry *parent)
2508 struct vfsmount *mount = NULL;
2509 struct dentry *dentry;
2510 struct inode *inode;
2512 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2517 inode_lock(d_inode(parent));
2518 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2519 if (IS_ERR(dentry)) {
2520 error = PTR_ERR(dentry);
2523 inode = new_inode(parent->d_inode->i_sb);
2529 inode->i_ino = get_next_ino();
2530 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2531 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
2532 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2533 MKDEV(MEM_MAJOR, 3));
2534 d_instantiate(dentry, inode);
2535 aa_null.dentry = dget(dentry);
2536 aa_null.mnt = mntget(mount);
2543 inode_unlock(d_inode(parent));
2544 simple_release_fs(&mount, &count);
2550 static const char *policy_get_link(struct dentry *dentry,
2551 struct inode *inode,
2552 struct delayed_call *done)
2559 return ERR_PTR(-ECHILD);
2561 ns = aa_get_current_ns();
2562 path.mnt = mntget(aafs_mnt);
2563 path.dentry = dget(ns_dir(ns));
2564 error = nd_jump_link(&path);
2567 return ERR_PTR(error);
2570 static int policy_readlink(struct dentry *dentry, char __user *buffer,
2576 res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
2577 d_inode(dentry)->i_ino);
2578 if (res > 0 && res < sizeof(name))
2579 res = readlink_copy(buffer, buflen, name);
2586 static const struct inode_operations policy_link_iops = {
2587 .readlink = policy_readlink,
2588 .get_link = policy_get_link,
2593 * aa_create_aafs - create the apparmor security filesystem
2595 * dentries created here are released by aa_destroy_aafs
2597 * Returns: error on failure
2599 static int __init aa_create_aafs(void)
2601 struct dentry *dent;
2604 if (!apparmor_initialized)
2607 if (aa_sfs_entry.dentry) {
2608 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2612 /* setup apparmorfs used to virtualize policy/ */
2613 aafs_mnt = kern_mount(&aafs_ops);
2614 if (IS_ERR(aafs_mnt))
2615 panic("can't set apparmorfs up\n");
2616 aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
2618 /* Populate fs tree. */
2619 error = entry_create_dir(&aa_sfs_entry, NULL);
2623 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2624 NULL, &aa_fs_profile_load);
2627 ns_subload(root_ns) = dent;
2629 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2630 NULL, &aa_fs_profile_replace);
2633 ns_subreplace(root_ns) = dent;
2635 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2636 NULL, &aa_fs_profile_remove);
2639 ns_subremove(root_ns) = dent;
2641 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2642 NULL, &aa_fs_ns_revision_fops);
2645 ns_subrevision(root_ns) = dent;
2647 /* policy tree referenced by magic policy symlink */
2648 mutex_lock_nested(&root_ns->lock, root_ns->level);
2649 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2650 aafs_mnt->mnt_root);
2651 mutex_unlock(&root_ns->lock);
2655 /* magic symlink similar to nsfs redirects based on task policy */
2656 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2657 NULL, &policy_link_iops);
2661 error = aa_mk_null_file(aa_sfs_entry.dentry);
2665 /* TODO: add default profile to apparmorfs */
2667 /* Report that AppArmor fs is enabled */
2668 aa_info_message("AppArmor Filesystem Enabled");
2672 error = PTR_ERR(dent);
2675 AA_ERROR("Error creating AppArmor securityfs\n");
2679 fs_initcall(aa_create_aafs);