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/zstd.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"
39 #include "include/task.h"
42 * The apparmor filesystem interface used for policy load and introspection
43 * The interface is split into two main components based on their function
44 * a securityfs component:
45 * used for static files that are always available, and which allows
46 * userspace to specificy the location of the security filesystem.
48 * fns and data are prefixed with
51 * an apparmorfs component:
52 * used loaded policy content and introspection. It is not part of a
53 * regular mounted filesystem and is available only through the magic
54 * policy symlink in the root of the securityfs apparmor/ directory.
55 * Tasks queries will be magically redirected to the correct portion
56 * of the policy tree based on their confinement.
58 * fns and data are prefixed with
61 * The aa_fs_ prefix is used to indicate the fn is used by both the
62 * securityfs and apparmorfs filesystems.
70 struct rawdata_f_data {
71 struct aa_loaddata *loaddata;
74 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
75 #define RAWDATA_F_DATA_BUF(p) (char *)(p + 1)
77 static void rawdata_f_data_free(struct rawdata_f_data *private)
82 aa_put_loaddata(private->loaddata);
86 static struct rawdata_f_data *rawdata_f_data_alloc(size_t size)
88 struct rawdata_f_data *ret;
90 if (size > SIZE_MAX - sizeof(*ret))
91 return ERR_PTR(-EINVAL);
93 ret = kvzalloc(sizeof(*ret) + size, GFP_KERNEL);
95 return ERR_PTR(-ENOMEM);
102 * mangle_name - mangle a profile name to std profile layout form
103 * @name: profile name to mangle (NOT NULL)
104 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
106 * Returns: length of mangled name
108 static int mangle_name(const char *name, char *target)
112 while (*name == '/' || *name == '.')
116 for (; *name; name++) {
119 else if (isspace(*name))
121 else if (isalnum(*name) || strchr("._-", *name))
128 for (; *name; name++) {
129 if (isalnum(*name) || isspace(*name) ||
130 strchr("/._-", *name))
142 * aafs - core fns and data for the policy tree
145 #define AAFS_NAME "apparmorfs"
146 static struct vfsmount *aafs_mnt;
147 static int aafs_count;
150 static int aafs_show_path(struct seq_file *seq, struct dentry *dentry)
152 seq_printf(seq, "%s:[%lu]", AAFS_NAME, d_inode(dentry)->i_ino);
156 static void aafs_free_inode(struct inode *inode)
158 if (S_ISLNK(inode->i_mode))
159 kfree(inode->i_link);
160 free_inode_nonrcu(inode);
163 static const struct super_operations aafs_super_ops = {
164 .statfs = simple_statfs,
165 .free_inode = aafs_free_inode,
166 .show_path = aafs_show_path,
169 static int apparmorfs_fill_super(struct super_block *sb, struct fs_context *fc)
171 static struct tree_descr files[] = { {""} };
174 error = simple_fill_super(sb, AAFS_MAGIC, files);
177 sb->s_op = &aafs_super_ops;
182 static int apparmorfs_get_tree(struct fs_context *fc)
184 return get_tree_single(fc, apparmorfs_fill_super);
187 static const struct fs_context_operations apparmorfs_context_ops = {
188 .get_tree = apparmorfs_get_tree,
191 static int apparmorfs_init_fs_context(struct fs_context *fc)
193 fc->ops = &apparmorfs_context_ops;
197 static struct file_system_type aafs_ops = {
198 .owner = THIS_MODULE,
200 .init_fs_context = apparmorfs_init_fs_context,
201 .kill_sb = kill_anon_super,
205 * __aafs_setup_d_inode - basic inode setup for apparmorfs
206 * @dir: parent directory for the dentry
207 * @dentry: dentry we are seting the inode up for
208 * @mode: permissions the file should have
209 * @data: data to store on inode.i_private, available in open()
210 * @link: if symlink, symlink target string
211 * @fops: struct file_operations that should be used
212 * @iops: struct of inode_operations that should be used
214 static int __aafs_setup_d_inode(struct inode *dir, struct dentry *dentry,
215 umode_t mode, void *data, char *link,
216 const struct file_operations *fops,
217 const struct inode_operations *iops)
219 struct inode *inode = new_inode(dir->i_sb);
227 inode->i_ino = get_next_ino();
228 inode->i_mode = mode;
229 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
230 inode->i_private = data;
232 inode->i_op = iops ? iops : &simple_dir_inode_operations;
233 inode->i_fop = &simple_dir_operations;
236 } else if (S_ISLNK(mode)) {
237 inode->i_op = iops ? iops : &simple_symlink_inode_operations;
238 inode->i_link = link;
242 d_instantiate(dentry, inode);
249 * aafs_create - create a dentry in the apparmorfs filesystem
251 * @name: name of dentry to create
252 * @mode: permissions the file should have
253 * @parent: parent directory for this dentry
254 * @data: data to store on inode.i_private, available in open()
255 * @link: if symlink, symlink target string
256 * @fops: struct file_operations that should be used for
257 * @iops: struct of inode_operations that should be used
259 * This is the basic "create a xxx" function for apparmorfs.
261 * Returns a pointer to a dentry if it succeeds, that must be free with
262 * aafs_remove(). Will return ERR_PTR on failure.
264 static struct dentry *aafs_create(const char *name, umode_t mode,
265 struct dentry *parent, void *data, void *link,
266 const struct file_operations *fops,
267 const struct inode_operations *iops)
269 struct dentry *dentry;
276 if (!(mode & S_IFMT))
277 mode = (mode & S_IALLUGO) | S_IFREG;
279 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
281 return ERR_PTR(error);
283 dir = d_inode(parent);
286 dentry = lookup_one_len(name, parent, strlen(name));
287 if (IS_ERR(dentry)) {
288 error = PTR_ERR(dentry);
292 if (d_really_is_positive(dentry)) {
297 error = __aafs_setup_d_inode(dir, dentry, mode, data, link, fops, iops);
309 simple_release_fs(&aafs_mnt, &aafs_count);
311 return ERR_PTR(error);
315 * aafs_create_file - create a file in the apparmorfs filesystem
317 * @name: name of dentry to create
318 * @mode: permissions the file should have
319 * @parent: parent directory for this dentry
320 * @data: data to store on inode.i_private, available in open()
321 * @fops: struct file_operations that should be used for
325 static struct dentry *aafs_create_file(const char *name, umode_t mode,
326 struct dentry *parent, void *data,
327 const struct file_operations *fops)
329 return aafs_create(name, mode, parent, data, NULL, fops, NULL);
333 * aafs_create_dir - create a directory in the apparmorfs filesystem
335 * @name: name of dentry to create
336 * @parent: parent directory for this dentry
340 static struct dentry *aafs_create_dir(const char *name, struct dentry *parent)
342 return aafs_create(name, S_IFDIR | 0755, parent, NULL, NULL, NULL,
347 * aafs_remove - removes a file or directory from the apparmorfs filesystem
349 * @dentry: dentry of the file/directory/symlink to removed.
351 static void aafs_remove(struct dentry *dentry)
355 if (!dentry || IS_ERR(dentry))
358 dir = d_inode(dentry->d_parent);
360 if (simple_positive(dentry)) {
361 if (d_is_dir(dentry))
362 simple_rmdir(dir, dentry);
364 simple_unlink(dir, dentry);
369 simple_release_fs(&aafs_mnt, &aafs_count);
374 * aa_fs - policy load/replace/remove
378 * aa_simple_write_to_buffer - common routine for getting policy from user
379 * @userbuf: user buffer to copy data from (NOT NULL)
380 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
381 * @copy_size: size of data to copy from user buffer
382 * @pos: position write is at in the file (NOT NULL)
384 * Returns: kernel buffer containing copy of user buffer data or an
385 * ERR_PTR on failure.
387 static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
392 struct aa_loaddata *data;
394 AA_BUG(copy_size > alloc_size);
397 /* only writes from pos 0, that is complete writes */
398 return ERR_PTR(-ESPIPE);
400 /* freed by caller to simple_write_to_buffer */
401 data = aa_loaddata_alloc(alloc_size);
405 data->size = copy_size;
406 if (copy_from_user(data->data, userbuf, copy_size)) {
407 aa_put_loaddata(data);
408 return ERR_PTR(-EFAULT);
414 static ssize_t policy_update(u32 mask, const char __user *buf, size_t size,
415 loff_t *pos, struct aa_ns *ns)
417 struct aa_loaddata *data;
418 struct aa_label *label;
421 label = begin_current_label_crit_section();
423 /* high level check about policy management - fine grained in
426 error = aa_may_manage_policy(current_cred(), label, ns, mask);
430 data = aa_simple_write_to_buffer(buf, size, size, pos);
431 error = PTR_ERR(data);
433 error = aa_replace_profiles(ns, label, mask, data);
434 aa_put_loaddata(data);
437 end_current_label_crit_section(label);
442 /* .load file hook fn to load policy */
443 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
446 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
447 int error = policy_update(AA_MAY_LOAD_POLICY, buf, size, pos, ns);
454 static const struct file_operations aa_fs_profile_load = {
455 .write = profile_load,
456 .llseek = default_llseek,
459 /* .replace file hook fn to load and/or replace policy */
460 static ssize_t profile_replace(struct file *f, const char __user *buf,
461 size_t size, loff_t *pos)
463 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
464 int error = policy_update(AA_MAY_LOAD_POLICY | AA_MAY_REPLACE_POLICY,
471 static const struct file_operations aa_fs_profile_replace = {
472 .write = profile_replace,
473 .llseek = default_llseek,
476 /* .remove file hook fn to remove loaded policy */
477 static ssize_t profile_remove(struct file *f, const char __user *buf,
478 size_t size, loff_t *pos)
480 struct aa_loaddata *data;
481 struct aa_label *label;
483 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
485 label = begin_current_label_crit_section();
486 /* high level check about policy management - fine grained in
489 error = aa_may_manage_policy(current_cred(), label, ns,
490 AA_MAY_REMOVE_POLICY);
495 * aa_remove_profile needs a null terminated string so 1 extra
496 * byte is allocated and the copied data is null terminated.
498 data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
500 error = PTR_ERR(data);
502 data->data[size] = 0;
503 error = aa_remove_profiles(ns, label, data->data, size);
504 aa_put_loaddata(data);
507 end_current_label_crit_section(label);
512 static const struct file_operations aa_fs_profile_remove = {
513 .write = profile_remove,
514 .llseek = default_llseek,
522 /* revision file hook fn for policy loads */
523 static int ns_revision_release(struct inode *inode, struct file *file)
525 struct aa_revision *rev = file->private_data;
535 static ssize_t ns_revision_read(struct file *file, char __user *buf,
536 size_t size, loff_t *ppos)
538 struct aa_revision *rev = file->private_data;
543 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
544 last_read = rev->last_read;
545 if (last_read == rev->ns->revision) {
546 mutex_unlock(&rev->ns->lock);
547 if (file->f_flags & O_NONBLOCK)
549 if (wait_event_interruptible(rev->ns->wait,
551 READ_ONCE(rev->ns->revision)))
553 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
556 avail = sprintf(buffer, "%ld\n", rev->ns->revision);
557 if (*ppos + size > avail) {
558 rev->last_read = rev->ns->revision;
561 mutex_unlock(&rev->ns->lock);
563 return simple_read_from_buffer(buf, size, ppos, buffer, avail);
566 static int ns_revision_open(struct inode *inode, struct file *file)
568 struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
573 rev->ns = aa_get_ns(inode->i_private);
575 rev->ns = aa_get_current_ns();
576 file->private_data = rev;
581 static __poll_t ns_revision_poll(struct file *file, poll_table *pt)
583 struct aa_revision *rev = file->private_data;
587 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
588 poll_wait(file, &rev->ns->wait, pt);
589 if (rev->last_read < rev->ns->revision)
590 mask |= EPOLLIN | EPOLLRDNORM;
591 mutex_unlock(&rev->ns->lock);
597 void __aa_bump_ns_revision(struct aa_ns *ns)
599 WRITE_ONCE(ns->revision, READ_ONCE(ns->revision) + 1);
600 wake_up_interruptible(&ns->wait);
603 static const struct file_operations aa_fs_ns_revision_fops = {
604 .owner = THIS_MODULE,
605 .open = ns_revision_open,
606 .poll = ns_revision_poll,
607 .read = ns_revision_read,
608 .llseek = generic_file_llseek,
609 .release = ns_revision_release,
612 static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
613 const char *match_str, size_t match_len)
615 struct aa_ruleset *rules = list_first_entry(&profile->rules,
616 typeof(*rules), list);
617 struct aa_perms tmp = { };
618 aa_state_t state = DFA_NOMATCH;
620 if (profile_unconfined(profile))
622 if (rules->file.dfa && *match_str == AA_CLASS_FILE) {
623 state = aa_dfa_match_len(rules->file.dfa,
624 rules->file.start[AA_CLASS_FILE],
625 match_str + 1, match_len - 1);
627 struct path_cond cond = { };
629 tmp = *(aa_lookup_fperms(&(rules->file), state, &cond));
631 } else if (rules->policy.dfa) {
632 if (!RULE_MEDIATES(rules, *match_str))
633 return; /* no change to current perms */
634 state = aa_dfa_match_len(rules->policy.dfa,
635 rules->policy.start[0],
636 match_str, match_len);
638 tmp = *aa_lookup_perms(&rules->policy, state);
640 aa_apply_modes_to_perms(profile, &tmp);
641 aa_perms_accum_raw(perms, &tmp);
646 * query_data - queries a policy and writes its data to buf
647 * @buf: the resulting data is stored here (NOT NULL)
648 * @buf_len: size of buf
649 * @query: query string used to retrieve data
650 * @query_len: size of query including second NUL byte
652 * The buffers pointed to by buf and query may overlap. The query buffer is
653 * parsed before buf is written to.
655 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
656 * the security confinement context and <KEY> is the name of the data to
657 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
659 * Don't expect the contents of buf to be preserved on failure.
661 * Returns: number of characters written to buf or -errno on failure
663 static ssize_t query_data(char *buf, size_t buf_len,
664 char *query, size_t query_len)
669 struct aa_label *label, *curr;
670 struct aa_profile *profile;
671 struct aa_data *data;
676 return -EINVAL; /* need a query */
678 key = query + strnlen(query, query_len) + 1;
679 if (key + 1 >= query + query_len)
680 return -EINVAL; /* not enough space for a non-empty key */
681 if (key + strnlen(key, query + query_len - key) >= query + query_len)
682 return -EINVAL; /* must end with NUL */
684 if (buf_len < sizeof(bytes) + sizeof(blocks))
685 return -EINVAL; /* not enough space */
687 curr = begin_current_label_crit_section();
688 label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
689 end_current_label_crit_section(curr);
691 return PTR_ERR(label);
693 /* We are going to leave space for two numbers. The first is the total
694 * number of bytes we are writing after the first number. This is so
695 * users can read the full output without reallocation.
697 * The second number is the number of data blocks we're writing. An
698 * application might be confined by multiple policies having data in
701 memset(buf, 0, sizeof(bytes) + sizeof(blocks));
702 out = buf + sizeof(bytes) + sizeof(blocks);
705 label_for_each_confined(i, label, profile) {
709 data = rhashtable_lookup_fast(profile->data, &key,
713 if (out + sizeof(outle32) + data->size > buf +
716 return -EINVAL; /* not enough space */
718 outle32 = __cpu_to_le32(data->size);
719 memcpy(out, &outle32, sizeof(outle32));
720 out += sizeof(outle32);
721 memcpy(out, data->data, data->size);
728 outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
729 memcpy(buf, &outle32, sizeof(outle32));
730 outle32 = __cpu_to_le32(blocks);
731 memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
737 * query_label - queries a label and writes permissions to buf
738 * @buf: the resulting permissions string is stored here (NOT NULL)
739 * @buf_len: size of buf
740 * @query: binary query string to match against the dfa
741 * @query_len: size of query
742 * @view_only: only compute for querier's view
744 * The buffers pointed to by buf and query may overlap. The query buffer is
745 * parsed before buf is written to.
747 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
748 * the name of the label, in the current namespace, that is to be queried and
749 * DFA_STRING is a binary string to match against the label(s)'s DFA.
751 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
752 * but must *not* be NUL terminated.
754 * Returns: number of characters written to buf or -errno on failure
756 static ssize_t query_label(char *buf, size_t buf_len,
757 char *query, size_t query_len, bool view_only)
759 struct aa_profile *profile;
760 struct aa_label *label, *curr;
761 char *label_name, *match_str;
762 size_t label_name_len, match_len;
763 struct aa_perms perms;
770 label_name_len = strnlen(query, query_len);
771 if (!label_name_len || label_name_len == query_len)
775 * The extra byte is to account for the null byte between the
776 * profile name and dfa string. profile_name_len is greater
777 * than zero and less than query_len, so a byte can be safely
778 * added or subtracted.
780 match_str = label_name + label_name_len + 1;
781 match_len = query_len - label_name_len - 1;
783 curr = begin_current_label_crit_section();
784 label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
785 end_current_label_crit_section(curr);
787 return PTR_ERR(label);
791 label_for_each_in_ns(i, labels_ns(label), label, profile) {
792 profile_query_cb(profile, &perms, match_str, match_len);
795 label_for_each(i, label, profile) {
796 profile_query_cb(profile, &perms, match_str, match_len);
801 return scnprintf(buf, buf_len,
802 "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
803 perms.allow, perms.deny, perms.audit, perms.quiet);
807 * Transaction based IO.
808 * The file expects a write which triggers the transaction, and then
809 * possibly a read(s) which collects the result - which is stored in a
810 * file-local buffer. Once a new write is performed, a new set of results
811 * are stored in the file-local buffer.
813 struct multi_transaction {
819 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
821 static void multi_transaction_kref(struct kref *kref)
823 struct multi_transaction *t;
825 t = container_of(kref, struct multi_transaction, count);
826 free_page((unsigned long) t);
829 static struct multi_transaction *
830 get_multi_transaction(struct multi_transaction *t)
833 kref_get(&(t->count));
838 static void put_multi_transaction(struct multi_transaction *t)
841 kref_put(&(t->count), multi_transaction_kref);
844 /* does not increment @new's count */
845 static void multi_transaction_set(struct file *file,
846 struct multi_transaction *new, size_t n)
848 struct multi_transaction *old;
850 AA_BUG(n > MULTI_TRANSACTION_LIMIT);
853 spin_lock(&file->f_lock);
854 old = (struct multi_transaction *) file->private_data;
855 file->private_data = new;
856 spin_unlock(&file->f_lock);
857 put_multi_transaction(old);
860 static struct multi_transaction *multi_transaction_new(struct file *file,
861 const char __user *buf,
864 struct multi_transaction *t;
866 if (size > MULTI_TRANSACTION_LIMIT - 1)
867 return ERR_PTR(-EFBIG);
869 t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
871 return ERR_PTR(-ENOMEM);
872 kref_init(&t->count);
873 if (copy_from_user(t->data, buf, size)) {
874 put_multi_transaction(t);
875 return ERR_PTR(-EFAULT);
881 static ssize_t multi_transaction_read(struct file *file, char __user *buf,
882 size_t size, loff_t *pos)
884 struct multi_transaction *t;
887 spin_lock(&file->f_lock);
888 t = get_multi_transaction(file->private_data);
889 spin_unlock(&file->f_lock);
894 ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
895 put_multi_transaction(t);
900 static int multi_transaction_release(struct inode *inode, struct file *file)
902 put_multi_transaction(file->private_data);
907 #define QUERY_CMD_LABEL "label\0"
908 #define QUERY_CMD_LABEL_LEN 6
909 #define QUERY_CMD_PROFILE "profile\0"
910 #define QUERY_CMD_PROFILE_LEN 8
911 #define QUERY_CMD_LABELALL "labelall\0"
912 #define QUERY_CMD_LABELALL_LEN 9
913 #define QUERY_CMD_DATA "data\0"
914 #define QUERY_CMD_DATA_LEN 5
917 * aa_write_access - generic permissions and data query
918 * @file: pointer to open apparmorfs/access file
919 * @ubuf: user buffer containing the complete query string (NOT NULL)
920 * @count: size of ubuf
921 * @ppos: position in the file (MUST BE ZERO)
923 * Allows for one permissions or data query per open(), write(), and read()
924 * sequence. The only queries currently supported are label-based queries for
925 * permissions or data.
927 * For permissions queries, ubuf must begin with "label\0", followed by the
928 * profile query specific format described in the query_label() function
931 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
932 * <LABEL> is the name of the security confinement context and <KEY> is the
933 * name of the data to retrieve.
935 * Returns: number of bytes written or -errno on failure
937 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
938 size_t count, loff_t *ppos)
940 struct multi_transaction *t;
946 t = multi_transaction_new(file, ubuf, count);
950 if (count > QUERY_CMD_PROFILE_LEN &&
951 !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
952 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
953 t->data + QUERY_CMD_PROFILE_LEN,
954 count - QUERY_CMD_PROFILE_LEN, true);
955 } else if (count > QUERY_CMD_LABEL_LEN &&
956 !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
957 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
958 t->data + QUERY_CMD_LABEL_LEN,
959 count - QUERY_CMD_LABEL_LEN, true);
960 } else if (count > QUERY_CMD_LABELALL_LEN &&
961 !memcmp(t->data, QUERY_CMD_LABELALL,
962 QUERY_CMD_LABELALL_LEN)) {
963 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
964 t->data + QUERY_CMD_LABELALL_LEN,
965 count - QUERY_CMD_LABELALL_LEN, false);
966 } else if (count > QUERY_CMD_DATA_LEN &&
967 !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
968 len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
969 t->data + QUERY_CMD_DATA_LEN,
970 count - QUERY_CMD_DATA_LEN);
975 put_multi_transaction(t);
979 multi_transaction_set(file, t, len);
984 static const struct file_operations aa_sfs_access = {
985 .write = aa_write_access,
986 .read = multi_transaction_read,
987 .release = multi_transaction_release,
988 .llseek = generic_file_llseek,
991 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
993 struct aa_sfs_entry *fs_file = seq->private;
998 switch (fs_file->v_type) {
999 case AA_SFS_TYPE_BOOLEAN:
1000 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
1002 case AA_SFS_TYPE_STRING:
1003 seq_printf(seq, "%s\n", fs_file->v.string);
1005 case AA_SFS_TYPE_U64:
1006 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1009 /* Ignore unpritable entry types. */
1016 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1018 return single_open(file, aa_sfs_seq_show, inode->i_private);
1021 const struct file_operations aa_sfs_seq_file_ops = {
1022 .owner = THIS_MODULE,
1023 .open = aa_sfs_seq_open,
1025 .llseek = seq_lseek,
1026 .release = single_release,
1030 * profile based file operations
1031 * policy/profiles/XXXX/profiles/ *
1034 #define SEQ_PROFILE_FOPS(NAME) \
1035 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1037 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1040 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1041 .owner = THIS_MODULE, \
1042 .open = seq_profile_ ##NAME ##_open, \
1044 .llseek = seq_lseek, \
1045 .release = seq_profile_release, \
1048 static int seq_profile_open(struct inode *inode, struct file *file,
1049 int (*show)(struct seq_file *, void *))
1051 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1052 int error = single_open(file, show, proxy);
1055 file->private_data = NULL;
1056 aa_put_proxy(proxy);
1062 static int seq_profile_release(struct inode *inode, struct file *file)
1064 struct seq_file *seq = (struct seq_file *) file->private_data;
1066 aa_put_proxy(seq->private);
1067 return single_release(inode, file);
1070 static int seq_profile_name_show(struct seq_file *seq, void *v)
1072 struct aa_proxy *proxy = seq->private;
1073 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1074 struct aa_profile *profile = labels_profile(label);
1075 seq_printf(seq, "%s\n", profile->base.name);
1076 aa_put_label(label);
1081 static int seq_profile_mode_show(struct seq_file *seq, void *v)
1083 struct aa_proxy *proxy = seq->private;
1084 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1085 struct aa_profile *profile = labels_profile(label);
1086 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1087 aa_put_label(label);
1092 static int seq_profile_attach_show(struct seq_file *seq, void *v)
1094 struct aa_proxy *proxy = seq->private;
1095 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1096 struct aa_profile *profile = labels_profile(label);
1097 if (profile->attach.xmatch_str)
1098 seq_printf(seq, "%s\n", profile->attach.xmatch_str);
1099 else if (profile->attach.xmatch.dfa)
1100 seq_puts(seq, "<unknown>\n");
1102 seq_printf(seq, "%s\n", profile->base.name);
1103 aa_put_label(label);
1108 static int seq_profile_hash_show(struct seq_file *seq, void *v)
1110 struct aa_proxy *proxy = seq->private;
1111 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1112 struct aa_profile *profile = labels_profile(label);
1113 unsigned int i, size = aa_hash_size();
1115 if (profile->hash) {
1116 for (i = 0; i < size; i++)
1117 seq_printf(seq, "%.2x", profile->hash[i]);
1118 seq_putc(seq, '\n');
1120 aa_put_label(label);
1125 SEQ_PROFILE_FOPS(name);
1126 SEQ_PROFILE_FOPS(mode);
1127 SEQ_PROFILE_FOPS(attach);
1128 SEQ_PROFILE_FOPS(hash);
1131 * namespace based files
1132 * several root files and
1136 #define SEQ_NS_FOPS(NAME) \
1137 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1139 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1142 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1143 .owner = THIS_MODULE, \
1144 .open = seq_ns_ ##NAME ##_open, \
1146 .llseek = seq_lseek, \
1147 .release = single_release, \
1150 static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1152 struct aa_label *label;
1154 label = begin_current_label_crit_section();
1155 seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
1156 end_current_label_crit_section(label);
1161 static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
1163 struct aa_label *label;
1164 struct aa_profile *profile;
1168 label = begin_current_label_crit_section();
1170 if (label->size > 1) {
1171 label_for_each(it, label, profile)
1172 if (profile->ns != labels_ns(label)) {
1178 seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
1179 end_current_label_crit_section(label);
1184 static int seq_ns_level_show(struct seq_file *seq, void *v)
1186 struct aa_label *label;
1188 label = begin_current_label_crit_section();
1189 seq_printf(seq, "%d\n", labels_ns(label)->level);
1190 end_current_label_crit_section(label);
1195 static int seq_ns_name_show(struct seq_file *seq, void *v)
1197 struct aa_label *label = begin_current_label_crit_section();
1198 seq_printf(seq, "%s\n", labels_ns(label)->base.name);
1199 end_current_label_crit_section(label);
1204 static int seq_ns_compress_min_show(struct seq_file *seq, void *v)
1206 seq_printf(seq, "%d\n", AA_MIN_CLEVEL);
1210 static int seq_ns_compress_max_show(struct seq_file *seq, void *v)
1212 seq_printf(seq, "%d\n", AA_MAX_CLEVEL);
1216 SEQ_NS_FOPS(stacked);
1217 SEQ_NS_FOPS(nsstacked);
1220 SEQ_NS_FOPS(compress_min);
1221 SEQ_NS_FOPS(compress_max);
1224 /* policy/raw_data/ * file ops */
1225 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1226 #define SEQ_RAWDATA_FOPS(NAME) \
1227 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1229 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1232 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1233 .owner = THIS_MODULE, \
1234 .open = seq_rawdata_ ##NAME ##_open, \
1236 .llseek = seq_lseek, \
1237 .release = seq_rawdata_release, \
1240 static int seq_rawdata_open(struct inode *inode, struct file *file,
1241 int (*show)(struct seq_file *, void *))
1243 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1247 /* lost race this ent is being reaped */
1250 error = single_open(file, show, data);
1252 AA_BUG(file->private_data &&
1253 ((struct seq_file *)file->private_data)->private);
1254 aa_put_loaddata(data);
1260 static int seq_rawdata_release(struct inode *inode, struct file *file)
1262 struct seq_file *seq = (struct seq_file *) file->private_data;
1265 aa_put_loaddata(seq->private);
1267 return single_release(inode, file);
1270 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1272 struct aa_loaddata *data = seq->private;
1274 seq_printf(seq, "v%d\n", data->abi);
1279 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1281 struct aa_loaddata *data = seq->private;
1283 seq_printf(seq, "%ld\n", data->revision);
1288 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1290 struct aa_loaddata *data = seq->private;
1291 unsigned int i, size = aa_hash_size();
1294 for (i = 0; i < size; i++)
1295 seq_printf(seq, "%.2x", data->hash[i]);
1296 seq_putc(seq, '\n');
1302 static int seq_rawdata_compressed_size_show(struct seq_file *seq, void *v)
1304 struct aa_loaddata *data = seq->private;
1306 seq_printf(seq, "%zu\n", data->compressed_size);
1311 SEQ_RAWDATA_FOPS(abi);
1312 SEQ_RAWDATA_FOPS(revision);
1313 SEQ_RAWDATA_FOPS(hash);
1314 SEQ_RAWDATA_FOPS(compressed_size);
1316 static int decompress_zstd(char *src, size_t slen, char *dst, size_t dlen)
1318 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1320 const size_t wksp_len = zstd_dctx_workspace_bound();
1326 wksp = kvzalloc(wksp_len, GFP_KERNEL);
1331 ctx = zstd_init_dctx(wksp, wksp_len);
1336 out_len = zstd_decompress_dctx(ctx, dst, dlen, src, slen);
1337 if (zstd_is_error(out_len)) {
1349 memcpy(dst, src, slen);
1353 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1356 struct rawdata_f_data *private = file->private_data;
1358 return simple_read_from_buffer(buf, size, ppos,
1359 RAWDATA_F_DATA_BUF(private),
1360 private->loaddata->size);
1363 static int rawdata_release(struct inode *inode, struct file *file)
1365 rawdata_f_data_free(file->private_data);
1370 static int rawdata_open(struct inode *inode, struct file *file)
1373 struct aa_loaddata *loaddata;
1374 struct rawdata_f_data *private;
1376 if (!aa_current_policy_view_capable(NULL))
1379 loaddata = __aa_get_loaddata(inode->i_private);
1381 /* lost race: this entry is being reaped */
1384 private = rawdata_f_data_alloc(loaddata->size);
1385 if (IS_ERR(private)) {
1386 error = PTR_ERR(private);
1387 goto fail_private_alloc;
1390 private->loaddata = loaddata;
1392 error = decompress_zstd(loaddata->data, loaddata->compressed_size,
1393 RAWDATA_F_DATA_BUF(private),
1396 goto fail_decompress;
1398 file->private_data = private;
1402 rawdata_f_data_free(private);
1406 aa_put_loaddata(loaddata);
1410 static const struct file_operations rawdata_fops = {
1411 .open = rawdata_open,
1412 .read = rawdata_read,
1413 .llseek = generic_file_llseek,
1414 .release = rawdata_release,
1417 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1421 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1422 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1423 /* no refcounts on i_private */
1424 aafs_remove(rawdata->dents[i]);
1425 rawdata->dents[i] = NULL;
1430 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1432 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1435 remove_rawdata_dents(rawdata);
1436 list_del_init(&rawdata->list);
1437 aa_put_ns(rawdata->ns);
1442 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1444 struct dentry *dent, *dir;
1448 AA_BUG(!mutex_is_locked(&ns->lock));
1449 AA_BUG(!ns_subdata_dir(ns));
1452 * just use ns revision dir was originally created at. This is
1453 * under ns->lock and if load is successful revision will be
1454 * bumped and is guaranteed to be unique
1456 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1460 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1462 /* ->name freed when rawdata freed */
1463 return PTR_ERR(dir);
1464 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1466 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1467 &seq_rawdata_abi_fops);
1470 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1472 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1473 &seq_rawdata_revision_fops);
1476 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1478 if (aa_g_hash_policy) {
1479 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1480 rawdata, &seq_rawdata_hash_fops);
1483 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1486 dent = aafs_create_file("compressed_size", S_IFREG | 0444, dir,
1488 &seq_rawdata_compressed_size_fops);
1491 rawdata->dents[AAFS_LOADDATA_COMPRESSED_SIZE] = dent;
1493 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1494 dir, rawdata, &rawdata_fops);
1497 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1498 d_inode(dent)->i_size = rawdata->size;
1500 rawdata->ns = aa_get_ns(ns);
1501 list_add(&rawdata->list, &ns->rawdata_list);
1502 /* no refcount on inode rawdata */
1507 remove_rawdata_dents(rawdata);
1509 return PTR_ERR(dent);
1511 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1514 /** fns to setup dynamic per profile/namespace files **/
1518 * Requires: @profile->ns->lock held
1520 void __aafs_profile_rmdir(struct aa_profile *profile)
1522 struct aa_profile *child;
1528 list_for_each_entry(child, &profile->base.profiles, base.list)
1529 __aafs_profile_rmdir(child);
1531 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1532 struct aa_proxy *proxy;
1533 if (!profile->dents[i])
1536 proxy = d_inode(profile->dents[i])->i_private;
1537 aafs_remove(profile->dents[i]);
1538 aa_put_proxy(proxy);
1539 profile->dents[i] = NULL;
1545 * Requires: @old->ns->lock held
1547 void __aafs_profile_migrate_dents(struct aa_profile *old,
1548 struct aa_profile *new)
1554 AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
1556 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1557 new->dents[i] = old->dents[i];
1558 if (new->dents[i]) {
1559 struct inode *inode = d_inode(new->dents[i]);
1561 inode->i_mtime = inode_set_ctime_current(inode);
1563 old->dents[i] = NULL;
1567 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1568 struct aa_profile *profile,
1569 const struct file_operations *fops)
1571 struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1572 struct dentry *dent;
1574 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1576 aa_put_proxy(proxy);
1581 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1582 static int profile_depth(struct aa_profile *profile)
1587 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1594 static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
1598 int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
1600 s = buffer = kmalloc(size, GFP_KERNEL);
1602 return ERR_PTR(-ENOMEM);
1604 for (; depth > 0; depth--) {
1605 strcpy(s, "../../");
1610 error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
1611 if (error >= size || error < 0) {
1613 return ERR_PTR(-ENAMETOOLONG);
1619 static void rawdata_link_cb(void *arg)
1624 static const char *rawdata_get_link_base(struct dentry *dentry,
1625 struct inode *inode,
1626 struct delayed_call *done,
1629 struct aa_proxy *proxy = inode->i_private;
1630 struct aa_label *label;
1631 struct aa_profile *profile;
1636 return ERR_PTR(-ECHILD);
1638 label = aa_get_label_rcu(&proxy->label);
1639 profile = labels_profile(label);
1640 depth = profile_depth(profile);
1641 target = gen_symlink_name(depth, profile->rawdata->name, name);
1642 aa_put_label(label);
1647 set_delayed_call(done, rawdata_link_cb, target);
1652 static const char *rawdata_get_link_sha1(struct dentry *dentry,
1653 struct inode *inode,
1654 struct delayed_call *done)
1656 return rawdata_get_link_base(dentry, inode, done, "sha1");
1659 static const char *rawdata_get_link_abi(struct dentry *dentry,
1660 struct inode *inode,
1661 struct delayed_call *done)
1663 return rawdata_get_link_base(dentry, inode, done, "abi");
1666 static const char *rawdata_get_link_data(struct dentry *dentry,
1667 struct inode *inode,
1668 struct delayed_call *done)
1670 return rawdata_get_link_base(dentry, inode, done, "raw_data");
1673 static const struct inode_operations rawdata_link_sha1_iops = {
1674 .get_link = rawdata_get_link_sha1,
1677 static const struct inode_operations rawdata_link_abi_iops = {
1678 .get_link = rawdata_get_link_abi,
1680 static const struct inode_operations rawdata_link_data_iops = {
1681 .get_link = rawdata_get_link_data,
1683 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1686 * Requires: @profile->ns->lock held
1688 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1690 struct aa_profile *child;
1691 struct dentry *dent = NULL, *dir;
1695 AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
1698 struct aa_profile *p;
1699 p = aa_deref_parent(profile);
1701 /* adding to parent that previously didn't have children */
1702 dent = aafs_create_dir("profiles", dent);
1705 prof_child_dir(p) = parent = dent;
1708 if (!profile->dirname) {
1710 len = mangle_name(profile->base.name, NULL);
1711 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1713 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1714 if (!profile->dirname) {
1719 mangle_name(profile->base.name, profile->dirname);
1720 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1723 dent = aafs_create_dir(profile->dirname, parent);
1726 prof_dir(profile) = dir = dent;
1728 dent = create_profile_file(dir, "name", profile,
1729 &seq_profile_name_fops);
1732 profile->dents[AAFS_PROF_NAME] = dent;
1734 dent = create_profile_file(dir, "mode", profile,
1735 &seq_profile_mode_fops);
1738 profile->dents[AAFS_PROF_MODE] = dent;
1740 dent = create_profile_file(dir, "attach", profile,
1741 &seq_profile_attach_fops);
1744 profile->dents[AAFS_PROF_ATTACH] = dent;
1746 if (profile->hash) {
1747 dent = create_profile_file(dir, "sha1", profile,
1748 &seq_profile_hash_fops);
1751 profile->dents[AAFS_PROF_HASH] = dent;
1754 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1755 if (profile->rawdata) {
1756 if (aa_g_hash_policy) {
1757 dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir,
1758 profile->label.proxy, NULL, NULL,
1759 &rawdata_link_sha1_iops);
1762 aa_get_proxy(profile->label.proxy);
1763 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1765 dent = aafs_create("raw_abi", S_IFLNK | 0444, dir,
1766 profile->label.proxy, NULL, NULL,
1767 &rawdata_link_abi_iops);
1770 aa_get_proxy(profile->label.proxy);
1771 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1773 dent = aafs_create("raw_data", S_IFLNK | 0444, dir,
1774 profile->label.proxy, NULL, NULL,
1775 &rawdata_link_data_iops);
1778 aa_get_proxy(profile->label.proxy);
1779 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1781 #endif /*CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1783 list_for_each_entry(child, &profile->base.profiles, base.list) {
1784 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1792 error = PTR_ERR(dent);
1795 __aafs_profile_rmdir(profile);
1800 static int ns_mkdir_op(struct mnt_idmap *idmap, struct inode *dir,
1801 struct dentry *dentry, umode_t mode)
1803 struct aa_ns *ns, *parent;
1804 /* TODO: improve permission check */
1805 struct aa_label *label;
1808 label = begin_current_label_crit_section();
1809 error = aa_may_manage_policy(current_cred(), label, NULL,
1810 AA_MAY_LOAD_POLICY);
1811 end_current_label_crit_section(label);
1815 parent = aa_get_ns(dir->i_private);
1816 AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1818 /* we have to unlock and then relock to get locking order right
1822 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1823 mutex_lock_nested(&parent->lock, parent->level);
1824 inode_lock_nested(dir, I_MUTEX_PARENT);
1828 error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
1833 ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1836 error = PTR_ERR(ns);
1840 aa_put_ns(ns); /* list ref remains */
1843 simple_release_fs(&aafs_mnt, &aafs_count);
1845 mutex_unlock(&parent->lock);
1851 static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1853 struct aa_ns *ns, *parent;
1854 /* TODO: improve permission check */
1855 struct aa_label *label;
1858 label = begin_current_label_crit_section();
1859 error = aa_may_manage_policy(current_cred(), label, NULL,
1860 AA_MAY_LOAD_POLICY);
1861 end_current_label_crit_section(label);
1865 parent = aa_get_ns(dir->i_private);
1866 /* rmdir calls the generic securityfs functions to remove files
1867 * from the apparmor dir. It is up to the apparmor ns locking
1871 inode_unlock(dentry->d_inode);
1873 mutex_lock_nested(&parent->lock, parent->level);
1874 ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1875 dentry->d_name.len));
1880 AA_BUG(ns_dir(ns) != dentry);
1886 mutex_unlock(&parent->lock);
1887 inode_lock_nested(dir, I_MUTEX_PARENT);
1888 inode_lock(dentry->d_inode);
1894 static const struct inode_operations ns_dir_inode_operations = {
1895 .lookup = simple_lookup,
1896 .mkdir = ns_mkdir_op,
1897 .rmdir = ns_rmdir_op,
1900 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1902 struct aa_loaddata *ent, *tmp;
1904 AA_BUG(!mutex_is_locked(&ns->lock));
1906 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1907 __aa_fs_remove_rawdata(ent);
1912 * Requires: @ns->lock held
1914 void __aafs_ns_rmdir(struct aa_ns *ns)
1917 struct aa_profile *child;
1922 AA_BUG(!mutex_is_locked(&ns->lock));
1924 list_for_each_entry(child, &ns->base.profiles, base.list)
1925 __aafs_profile_rmdir(child);
1927 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1928 mutex_lock_nested(&sub->lock, sub->level);
1929 __aafs_ns_rmdir(sub);
1930 mutex_unlock(&sub->lock);
1933 __aa_fs_list_remove_rawdata(ns);
1935 if (ns_subns_dir(ns)) {
1936 sub = d_inode(ns_subns_dir(ns))->i_private;
1939 if (ns_subload(ns)) {
1940 sub = d_inode(ns_subload(ns))->i_private;
1943 if (ns_subreplace(ns)) {
1944 sub = d_inode(ns_subreplace(ns))->i_private;
1947 if (ns_subremove(ns)) {
1948 sub = d_inode(ns_subremove(ns))->i_private;
1951 if (ns_subrevision(ns)) {
1952 sub = d_inode(ns_subrevision(ns))->i_private;
1956 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1957 aafs_remove(ns->dents[i]);
1958 ns->dents[i] = NULL;
1962 /* assumes cleanup in caller */
1963 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1965 struct dentry *dent;
1970 dent = aafs_create_dir("profiles", dir);
1972 return PTR_ERR(dent);
1973 ns_subprofs_dir(ns) = dent;
1975 dent = aafs_create_dir("raw_data", dir);
1977 return PTR_ERR(dent);
1978 ns_subdata_dir(ns) = dent;
1980 dent = aafs_create_file("revision", 0444, dir, ns,
1981 &aa_fs_ns_revision_fops);
1983 return PTR_ERR(dent);
1985 ns_subrevision(ns) = dent;
1987 dent = aafs_create_file(".load", 0640, dir, ns,
1988 &aa_fs_profile_load);
1990 return PTR_ERR(dent);
1992 ns_subload(ns) = dent;
1994 dent = aafs_create_file(".replace", 0640, dir, ns,
1995 &aa_fs_profile_replace);
1997 return PTR_ERR(dent);
1999 ns_subreplace(ns) = dent;
2001 dent = aafs_create_file(".remove", 0640, dir, ns,
2002 &aa_fs_profile_remove);
2004 return PTR_ERR(dent);
2006 ns_subremove(ns) = dent;
2008 /* use create_dentry so we can supply private data */
2009 dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
2010 &ns_dir_inode_operations);
2012 return PTR_ERR(dent);
2014 ns_subns_dir(ns) = dent;
2020 * Requires: @ns->lock held
2022 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
2023 struct dentry *dent)
2026 struct aa_profile *child;
2032 AA_BUG(!mutex_is_locked(&ns->lock));
2035 name = ns->base.name;
2038 /* create ns dir if it doesn't already exist */
2039 dent = aafs_create_dir(name, parent);
2044 ns_dir(ns) = dir = dent;
2045 error = __aafs_ns_mkdir_entries(ns, dir);
2050 list_for_each_entry(child, &ns->base.profiles, base.list) {
2051 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
2057 list_for_each_entry(sub, &ns->sub_ns, base.list) {
2058 mutex_lock_nested(&sub->lock, sub->level);
2059 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
2060 mutex_unlock(&sub->lock);
2068 error = PTR_ERR(dent);
2071 __aafs_ns_rmdir(ns);
2077 * __next_ns - find the next namespace to list
2078 * @root: root namespace to stop search at (NOT NULL)
2079 * @ns: current ns position (NOT NULL)
2081 * Find the next namespace from @ns under @root and handle all locking needed
2082 * while switching current namespace.
2084 * Returns: next namespace or NULL if at last namespace under @root
2085 * Requires: ns->parent->lock to be held
2086 * NOTE: will not unlock root->lock
2088 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
2090 struct aa_ns *parent, *next;
2094 AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
2096 /* is next namespace a child */
2097 if (!list_empty(&ns->sub_ns)) {
2098 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
2099 mutex_lock_nested(&next->lock, next->level);
2103 /* check if the next ns is a sibling, parent, gp, .. */
2104 parent = ns->parent;
2105 while (ns != root) {
2106 mutex_unlock(&ns->lock);
2107 next = list_next_entry(ns, base.list);
2108 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
2109 mutex_lock_nested(&next->lock, next->level);
2113 parent = parent->parent;
2120 * __first_profile - find the first profile in a namespace
2121 * @root: namespace that is root of profiles being displayed (NOT NULL)
2122 * @ns: namespace to start in (NOT NULL)
2124 * Returns: unrefcounted profile or NULL if no profile
2125 * Requires: profile->ns.lock to be held
2127 static struct aa_profile *__first_profile(struct aa_ns *root,
2131 AA_BUG(ns && !mutex_is_locked(&ns->lock));
2133 for (; ns; ns = __next_ns(root, ns)) {
2134 if (!list_empty(&ns->base.profiles))
2135 return list_first_entry(&ns->base.profiles,
2136 struct aa_profile, base.list);
2142 * __next_profile - step to the next profile in a profile tree
2143 * @p: current profile in tree (NOT NULL)
2145 * Perform a depth first traversal on the profile tree in a namespace
2147 * Returns: next profile or NULL if done
2148 * Requires: profile->ns.lock to be held
2150 static struct aa_profile *__next_profile(struct aa_profile *p)
2152 struct aa_profile *parent;
2153 struct aa_ns *ns = p->ns;
2155 AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
2157 /* is next profile a child */
2158 if (!list_empty(&p->base.profiles))
2159 return list_first_entry(&p->base.profiles, typeof(*p),
2162 /* is next profile a sibling, parent sibling, gp, sibling, .. */
2163 parent = rcu_dereference_protected(p->parent,
2164 mutex_is_locked(&p->ns->lock));
2166 p = list_next_entry(p, base.list);
2167 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
2170 parent = rcu_dereference_protected(parent->parent,
2171 mutex_is_locked(&parent->ns->lock));
2174 /* is next another profile in the namespace */
2175 p = list_next_entry(p, base.list);
2176 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
2183 * next_profile - step to the next profile in where ever it may be
2184 * @root: root namespace (NOT NULL)
2185 * @profile: current profile (NOT NULL)
2187 * Returns: next profile or NULL if there isn't one
2189 static struct aa_profile *next_profile(struct aa_ns *root,
2190 struct aa_profile *profile)
2192 struct aa_profile *next = __next_profile(profile);
2196 /* finished all profiles in namespace move to next namespace */
2197 return __first_profile(root, __next_ns(root, profile->ns));
2201 * p_start - start a depth first traversal of profile tree
2202 * @f: seq_file to fill
2203 * @pos: current position
2205 * Returns: first profile under current namespace or NULL if none found
2207 * acquires first ns->lock
2209 static void *p_start(struct seq_file *f, loff_t *pos)
2211 struct aa_profile *profile = NULL;
2212 struct aa_ns *root = aa_get_current_ns();
2216 /* find the first profile */
2217 mutex_lock_nested(&root->lock, root->level);
2218 profile = __first_profile(root, root);
2220 /* skip to position */
2221 for (; profile && l > 0; l--)
2222 profile = next_profile(root, profile);
2228 * p_next - read the next profile entry
2229 * @f: seq_file to fill
2230 * @p: profile previously returned
2231 * @pos: current position
2233 * Returns: next profile after @p or NULL if none
2235 * may acquire/release locks in namespace tree as necessary
2237 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2239 struct aa_profile *profile = p;
2240 struct aa_ns *ns = f->private;
2243 return next_profile(ns, profile);
2247 * p_stop - stop depth first traversal
2248 * @f: seq_file we are filling
2249 * @p: the last profile writen
2251 * Release all locking done by p_start/p_next on namespace tree
2253 static void p_stop(struct seq_file *f, void *p)
2255 struct aa_profile *profile = p;
2256 struct aa_ns *root = f->private, *ns;
2259 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2260 mutex_unlock(&ns->lock);
2262 mutex_unlock(&root->lock);
2267 * seq_show_profile - show a profile entry
2268 * @f: seq_file to file
2269 * @p: current position (profile) (NOT NULL)
2271 * Returns: error on failure
2273 static int seq_show_profile(struct seq_file *f, void *p)
2275 struct aa_profile *profile = (struct aa_profile *)p;
2276 struct aa_ns *root = f->private;
2278 aa_label_seq_xprint(f, root, &profile->label,
2279 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2285 static const struct seq_operations aa_sfs_profiles_op = {
2289 .show = seq_show_profile,
2292 static int profiles_open(struct inode *inode, struct file *file)
2294 if (!aa_current_policy_view_capable(NULL))
2297 return seq_open(file, &aa_sfs_profiles_op);
2300 static int profiles_release(struct inode *inode, struct file *file)
2302 return seq_release(inode, file);
2305 static const struct file_operations aa_sfs_profiles_fops = {
2306 .open = profiles_open,
2308 .llseek = seq_lseek,
2309 .release = profiles_release,
2313 /** Base file system setup **/
2314 static struct aa_sfs_entry aa_sfs_entry_file[] = {
2315 AA_SFS_FILE_STRING("mask",
2316 "create read write exec append mmap_exec link lock"),
2320 static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2321 AA_SFS_FILE_STRING("mask", "read trace"),
2325 static struct aa_sfs_entry aa_sfs_entry_signal[] = {
2326 AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
2330 static struct aa_sfs_entry aa_sfs_entry_attach[] = {
2331 AA_SFS_FILE_BOOLEAN("xattr", 1),
2334 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2335 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2336 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2337 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2338 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2339 AA_SFS_FILE_BOOLEAN("stack", 1),
2340 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2341 AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1),
2342 AA_SFS_FILE_BOOLEAN("computed_longest_left", 1),
2343 AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach),
2344 AA_SFS_FILE_STRING("version", "1.2"),
2348 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2349 AA_SFS_FILE_BOOLEAN("v5", 1),
2350 AA_SFS_FILE_BOOLEAN("v6", 1),
2351 AA_SFS_FILE_BOOLEAN("v7", 1),
2352 AA_SFS_FILE_BOOLEAN("v8", 1),
2353 AA_SFS_FILE_BOOLEAN("v9", 1),
2357 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2358 AA_SFS_DIR("versions", aa_sfs_entry_versions),
2359 AA_SFS_FILE_BOOLEAN("set_load", 1),
2360 /* number of out of band transitions supported */
2361 AA_SFS_FILE_U64("outofband", MAX_OOB_SUPPORTED),
2365 static struct aa_sfs_entry aa_sfs_entry_mount[] = {
2366 AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
2367 AA_SFS_FILE_STRING("move_mount", "detached"),
2371 static struct aa_sfs_entry aa_sfs_entry_ns[] = {
2372 AA_SFS_FILE_BOOLEAN("profile", 1),
2373 AA_SFS_FILE_BOOLEAN("pivot_root", 0),
2377 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2378 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2379 AA_SFS_FILE_BOOLEAN("data", 1),
2380 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2384 static struct aa_sfs_entry aa_sfs_entry_query[] = {
2385 AA_SFS_DIR("label", aa_sfs_entry_query_label),
2388 static struct aa_sfs_entry aa_sfs_entry_features[] = {
2389 AA_SFS_DIR("policy", aa_sfs_entry_policy),
2390 AA_SFS_DIR("domain", aa_sfs_entry_domain),
2391 AA_SFS_DIR("file", aa_sfs_entry_file),
2392 AA_SFS_DIR("network_v8", aa_sfs_entry_network),
2393 AA_SFS_DIR("mount", aa_sfs_entry_mount),
2394 AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
2395 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
2396 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
2397 AA_SFS_DIR("caps", aa_sfs_entry_caps),
2398 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
2399 AA_SFS_DIR("signal", aa_sfs_entry_signal),
2400 AA_SFS_DIR("query", aa_sfs_entry_query),
2404 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2405 AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
2406 AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
2407 AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
2408 AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
2409 AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
2410 AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
2411 AA_SFS_FILE_FOPS("raw_data_compression_level_min", 0444, &seq_ns_compress_min_fops),
2412 AA_SFS_FILE_FOPS("raw_data_compression_level_max", 0444, &seq_ns_compress_max_fops),
2413 AA_SFS_DIR("features", aa_sfs_entry_features),
2417 static struct aa_sfs_entry aa_sfs_entry =
2418 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2421 * entry_create_file - create a file entry in the apparmor securityfs
2422 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2423 * @parent: the parent dentry in the securityfs
2425 * Use entry_remove_file to remove entries created with this fn.
2427 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2428 struct dentry *parent)
2432 fs_file->dentry = securityfs_create_file(fs_file->name,
2433 S_IFREG | fs_file->mode,
2436 if (IS_ERR(fs_file->dentry)) {
2437 error = PTR_ERR(fs_file->dentry);
2438 fs_file->dentry = NULL;
2443 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2445 * entry_create_dir - recursively create a directory entry in the securityfs
2446 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2447 * @parent: the parent dentry in the securityfs
2449 * Use entry_remove_dir to remove entries created with this fn.
2451 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2452 struct dentry *parent)
2454 struct aa_sfs_entry *fs_file;
2458 dir = securityfs_create_dir(fs_dir->name, parent);
2460 return PTR_ERR(dir);
2461 fs_dir->dentry = dir;
2463 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2464 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2465 error = entry_create_dir(fs_file, fs_dir->dentry);
2467 error = entry_create_file(fs_file, fs_dir->dentry);
2475 entry_remove_dir(fs_dir);
2481 * entry_remove_file - drop a single file entry in the apparmor securityfs
2482 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2484 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2486 if (!fs_file->dentry)
2489 securityfs_remove(fs_file->dentry);
2490 fs_file->dentry = NULL;
2494 * entry_remove_dir - recursively drop a directory entry from the securityfs
2495 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2497 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2499 struct aa_sfs_entry *fs_file;
2501 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2502 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2503 entry_remove_dir(fs_file);
2505 entry_remove_file(fs_file);
2508 entry_remove_file(fs_dir);
2512 * aa_destroy_aafs - cleanup and free aafs
2514 * releases dentries allocated by aa_create_aafs
2516 void __init aa_destroy_aafs(void)
2518 entry_remove_dir(&aa_sfs_entry);
2522 #define NULL_FILE_NAME ".null"
2523 struct path aa_null;
2525 static int aa_mk_null_file(struct dentry *parent)
2527 struct vfsmount *mount = NULL;
2528 struct dentry *dentry;
2529 struct inode *inode;
2531 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2536 inode_lock(d_inode(parent));
2537 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2538 if (IS_ERR(dentry)) {
2539 error = PTR_ERR(dentry);
2542 inode = new_inode(parent->d_inode->i_sb);
2548 inode->i_ino = get_next_ino();
2549 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2550 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
2551 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2552 MKDEV(MEM_MAJOR, 3));
2553 d_instantiate(dentry, inode);
2554 aa_null.dentry = dget(dentry);
2555 aa_null.mnt = mntget(mount);
2562 inode_unlock(d_inode(parent));
2563 simple_release_fs(&mount, &count);
2569 static const char *policy_get_link(struct dentry *dentry,
2570 struct inode *inode,
2571 struct delayed_call *done)
2578 return ERR_PTR(-ECHILD);
2580 ns = aa_get_current_ns();
2581 path.mnt = mntget(aafs_mnt);
2582 path.dentry = dget(ns_dir(ns));
2583 error = nd_jump_link(&path);
2586 return ERR_PTR(error);
2589 static int policy_readlink(struct dentry *dentry, char __user *buffer,
2595 res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
2596 d_inode(dentry)->i_ino);
2597 if (res > 0 && res < sizeof(name))
2598 res = readlink_copy(buffer, buflen, name);
2605 static const struct inode_operations policy_link_iops = {
2606 .readlink = policy_readlink,
2607 .get_link = policy_get_link,
2612 * aa_create_aafs - create the apparmor security filesystem
2614 * dentries created here are released by aa_destroy_aafs
2616 * Returns: error on failure
2618 static int __init aa_create_aafs(void)
2620 struct dentry *dent;
2623 if (!apparmor_initialized)
2626 if (aa_sfs_entry.dentry) {
2627 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2631 /* setup apparmorfs used to virtualize policy/ */
2632 aafs_mnt = kern_mount(&aafs_ops);
2633 if (IS_ERR(aafs_mnt))
2634 panic("can't set apparmorfs up\n");
2635 aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
2637 /* Populate fs tree. */
2638 error = entry_create_dir(&aa_sfs_entry, NULL);
2642 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2643 NULL, &aa_fs_profile_load);
2646 ns_subload(root_ns) = dent;
2648 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2649 NULL, &aa_fs_profile_replace);
2652 ns_subreplace(root_ns) = dent;
2654 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2655 NULL, &aa_fs_profile_remove);
2658 ns_subremove(root_ns) = dent;
2660 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2661 NULL, &aa_fs_ns_revision_fops);
2664 ns_subrevision(root_ns) = dent;
2666 /* policy tree referenced by magic policy symlink */
2667 mutex_lock_nested(&root_ns->lock, root_ns->level);
2668 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2669 aafs_mnt->mnt_root);
2670 mutex_unlock(&root_ns->lock);
2674 /* magic symlink similar to nsfs redirects based on task policy */
2675 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2676 NULL, &policy_link_iops);
2680 error = aa_mk_null_file(aa_sfs_entry.dentry);
2684 /* TODO: add default profile to apparmorfs */
2686 /* Report that AppArmor fs is enabled */
2687 aa_info_message("AppArmor Filesystem Enabled");
2691 error = PTR_ERR(dent);
2694 AA_ERROR("Error creating AppArmor securityfs\n");
2698 fs_initcall(aa_create_aafs);