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(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(label, ns, AA_MAY_REMOVE_POLICY);
494 * aa_remove_profile needs a null terminated string so 1 extra
495 * byte is allocated and the copied data is null terminated.
497 data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
499 error = PTR_ERR(data);
501 data->data[size] = 0;
502 error = aa_remove_profiles(ns, label, data->data, size);
503 aa_put_loaddata(data);
506 end_current_label_crit_section(label);
511 static const struct file_operations aa_fs_profile_remove = {
512 .write = profile_remove,
513 .llseek = default_llseek,
521 /* revision file hook fn for policy loads */
522 static int ns_revision_release(struct inode *inode, struct file *file)
524 struct aa_revision *rev = file->private_data;
534 static ssize_t ns_revision_read(struct file *file, char __user *buf,
535 size_t size, loff_t *ppos)
537 struct aa_revision *rev = file->private_data;
542 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
543 last_read = rev->last_read;
544 if (last_read == rev->ns->revision) {
545 mutex_unlock(&rev->ns->lock);
546 if (file->f_flags & O_NONBLOCK)
548 if (wait_event_interruptible(rev->ns->wait,
550 READ_ONCE(rev->ns->revision)))
552 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
555 avail = sprintf(buffer, "%ld\n", rev->ns->revision);
556 if (*ppos + size > avail) {
557 rev->last_read = rev->ns->revision;
560 mutex_unlock(&rev->ns->lock);
562 return simple_read_from_buffer(buf, size, ppos, buffer, avail);
565 static int ns_revision_open(struct inode *inode, struct file *file)
567 struct aa_revision *rev = kzalloc(sizeof(*rev), GFP_KERNEL);
572 rev->ns = aa_get_ns(inode->i_private);
574 rev->ns = aa_get_current_ns();
575 file->private_data = rev;
580 static __poll_t ns_revision_poll(struct file *file, poll_table *pt)
582 struct aa_revision *rev = file->private_data;
586 mutex_lock_nested(&rev->ns->lock, rev->ns->level);
587 poll_wait(file, &rev->ns->wait, pt);
588 if (rev->last_read < rev->ns->revision)
589 mask |= EPOLLIN | EPOLLRDNORM;
590 mutex_unlock(&rev->ns->lock);
596 void __aa_bump_ns_revision(struct aa_ns *ns)
598 WRITE_ONCE(ns->revision, READ_ONCE(ns->revision) + 1);
599 wake_up_interruptible(&ns->wait);
602 static const struct file_operations aa_fs_ns_revision_fops = {
603 .owner = THIS_MODULE,
604 .open = ns_revision_open,
605 .poll = ns_revision_poll,
606 .read = ns_revision_read,
607 .llseek = generic_file_llseek,
608 .release = ns_revision_release,
611 static void profile_query_cb(struct aa_profile *profile, struct aa_perms *perms,
612 const char *match_str, size_t match_len)
614 struct aa_ruleset *rules = list_first_entry(&profile->rules,
615 typeof(*rules), list);
616 struct aa_perms tmp = { };
617 aa_state_t state = DFA_NOMATCH;
619 if (profile_unconfined(profile))
621 if (rules->file.dfa && *match_str == AA_CLASS_FILE) {
622 state = aa_dfa_match_len(rules->file.dfa,
623 rules->file.start[AA_CLASS_FILE],
624 match_str + 1, match_len - 1);
626 struct path_cond cond = { };
628 tmp = *(aa_lookup_fperms(&(rules->file), state, &cond));
630 } else if (rules->policy.dfa) {
631 if (!RULE_MEDIATES(rules, *match_str))
632 return; /* no change to current perms */
633 state = aa_dfa_match_len(rules->policy.dfa,
634 rules->policy.start[0],
635 match_str, match_len);
637 tmp = *aa_lookup_perms(&rules->policy, state);
639 aa_apply_modes_to_perms(profile, &tmp);
640 aa_perms_accum_raw(perms, &tmp);
645 * query_data - queries a policy and writes its data to buf
646 * @buf: the resulting data is stored here (NOT NULL)
647 * @buf_len: size of buf
648 * @query: query string used to retrieve data
649 * @query_len: size of query including second NUL byte
651 * The buffers pointed to by buf and query may overlap. The query buffer is
652 * parsed before buf is written to.
654 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
655 * the security confinement context and <KEY> is the name of the data to
656 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
658 * Don't expect the contents of buf to be preserved on failure.
660 * Returns: number of characters written to buf or -errno on failure
662 static ssize_t query_data(char *buf, size_t buf_len,
663 char *query, size_t query_len)
668 struct aa_label *label, *curr;
669 struct aa_profile *profile;
670 struct aa_data *data;
675 return -EINVAL; /* need a query */
677 key = query + strnlen(query, query_len) + 1;
678 if (key + 1 >= query + query_len)
679 return -EINVAL; /* not enough space for a non-empty key */
680 if (key + strnlen(key, query + query_len - key) >= query + query_len)
681 return -EINVAL; /* must end with NUL */
683 if (buf_len < sizeof(bytes) + sizeof(blocks))
684 return -EINVAL; /* not enough space */
686 curr = begin_current_label_crit_section();
687 label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
688 end_current_label_crit_section(curr);
690 return PTR_ERR(label);
692 /* We are going to leave space for two numbers. The first is the total
693 * number of bytes we are writing after the first number. This is so
694 * users can read the full output without reallocation.
696 * The second number is the number of data blocks we're writing. An
697 * application might be confined by multiple policies having data in
700 memset(buf, 0, sizeof(bytes) + sizeof(blocks));
701 out = buf + sizeof(bytes) + sizeof(blocks);
704 label_for_each_confined(i, label, profile) {
708 data = rhashtable_lookup_fast(profile->data, &key,
712 if (out + sizeof(outle32) + data->size > buf +
715 return -EINVAL; /* not enough space */
717 outle32 = __cpu_to_le32(data->size);
718 memcpy(out, &outle32, sizeof(outle32));
719 out += sizeof(outle32);
720 memcpy(out, data->data, data->size);
727 outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
728 memcpy(buf, &outle32, sizeof(outle32));
729 outle32 = __cpu_to_le32(blocks);
730 memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
736 * query_label - queries a label and writes permissions to buf
737 * @buf: the resulting permissions string is stored here (NOT NULL)
738 * @buf_len: size of buf
739 * @query: binary query string to match against the dfa
740 * @query_len: size of query
741 * @view_only: only compute for querier's view
743 * The buffers pointed to by buf and query may overlap. The query buffer is
744 * parsed before buf is written to.
746 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
747 * the name of the label, in the current namespace, that is to be queried and
748 * DFA_STRING is a binary string to match against the label(s)'s DFA.
750 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
751 * but must *not* be NUL terminated.
753 * Returns: number of characters written to buf or -errno on failure
755 static ssize_t query_label(char *buf, size_t buf_len,
756 char *query, size_t query_len, bool view_only)
758 struct aa_profile *profile;
759 struct aa_label *label, *curr;
760 char *label_name, *match_str;
761 size_t label_name_len, match_len;
762 struct aa_perms perms;
769 label_name_len = strnlen(query, query_len);
770 if (!label_name_len || label_name_len == query_len)
774 * The extra byte is to account for the null byte between the
775 * profile name and dfa string. profile_name_len is greater
776 * than zero and less than query_len, so a byte can be safely
777 * added or subtracted.
779 match_str = label_name + label_name_len + 1;
780 match_len = query_len - label_name_len - 1;
782 curr = begin_current_label_crit_section();
783 label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
784 end_current_label_crit_section(curr);
786 return PTR_ERR(label);
790 label_for_each_in_ns(i, labels_ns(label), label, profile) {
791 profile_query_cb(profile, &perms, match_str, match_len);
794 label_for_each(i, label, profile) {
795 profile_query_cb(profile, &perms, match_str, match_len);
800 return scnprintf(buf, buf_len,
801 "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
802 perms.allow, perms.deny, perms.audit, perms.quiet);
806 * Transaction based IO.
807 * The file expects a write which triggers the transaction, and then
808 * possibly a read(s) which collects the result - which is stored in a
809 * file-local buffer. Once a new write is performed, a new set of results
810 * are stored in the file-local buffer.
812 struct multi_transaction {
818 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
820 static void multi_transaction_kref(struct kref *kref)
822 struct multi_transaction *t;
824 t = container_of(kref, struct multi_transaction, count);
825 free_page((unsigned long) t);
828 static struct multi_transaction *
829 get_multi_transaction(struct multi_transaction *t)
832 kref_get(&(t->count));
837 static void put_multi_transaction(struct multi_transaction *t)
840 kref_put(&(t->count), multi_transaction_kref);
843 /* does not increment @new's count */
844 static void multi_transaction_set(struct file *file,
845 struct multi_transaction *new, size_t n)
847 struct multi_transaction *old;
849 AA_BUG(n > MULTI_TRANSACTION_LIMIT);
852 spin_lock(&file->f_lock);
853 old = (struct multi_transaction *) file->private_data;
854 file->private_data = new;
855 spin_unlock(&file->f_lock);
856 put_multi_transaction(old);
859 static struct multi_transaction *multi_transaction_new(struct file *file,
860 const char __user *buf,
863 struct multi_transaction *t;
865 if (size > MULTI_TRANSACTION_LIMIT - 1)
866 return ERR_PTR(-EFBIG);
868 t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
870 return ERR_PTR(-ENOMEM);
871 kref_init(&t->count);
872 if (copy_from_user(t->data, buf, size)) {
873 put_multi_transaction(t);
874 return ERR_PTR(-EFAULT);
880 static ssize_t multi_transaction_read(struct file *file, char __user *buf,
881 size_t size, loff_t *pos)
883 struct multi_transaction *t;
886 spin_lock(&file->f_lock);
887 t = get_multi_transaction(file->private_data);
888 spin_unlock(&file->f_lock);
893 ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
894 put_multi_transaction(t);
899 static int multi_transaction_release(struct inode *inode, struct file *file)
901 put_multi_transaction(file->private_data);
906 #define QUERY_CMD_LABEL "label\0"
907 #define QUERY_CMD_LABEL_LEN 6
908 #define QUERY_CMD_PROFILE "profile\0"
909 #define QUERY_CMD_PROFILE_LEN 8
910 #define QUERY_CMD_LABELALL "labelall\0"
911 #define QUERY_CMD_LABELALL_LEN 9
912 #define QUERY_CMD_DATA "data\0"
913 #define QUERY_CMD_DATA_LEN 5
916 * aa_write_access - generic permissions and data query
917 * @file: pointer to open apparmorfs/access file
918 * @ubuf: user buffer containing the complete query string (NOT NULL)
919 * @count: size of ubuf
920 * @ppos: position in the file (MUST BE ZERO)
922 * Allows for one permissions or data query per open(), write(), and read()
923 * sequence. The only queries currently supported are label-based queries for
924 * permissions or data.
926 * For permissions queries, ubuf must begin with "label\0", followed by the
927 * profile query specific format described in the query_label() function
930 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
931 * <LABEL> is the name of the security confinement context and <KEY> is the
932 * name of the data to retrieve.
934 * Returns: number of bytes written or -errno on failure
936 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
937 size_t count, loff_t *ppos)
939 struct multi_transaction *t;
945 t = multi_transaction_new(file, ubuf, count);
949 if (count > QUERY_CMD_PROFILE_LEN &&
950 !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
951 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
952 t->data + QUERY_CMD_PROFILE_LEN,
953 count - QUERY_CMD_PROFILE_LEN, true);
954 } else if (count > QUERY_CMD_LABEL_LEN &&
955 !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
956 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
957 t->data + QUERY_CMD_LABEL_LEN,
958 count - QUERY_CMD_LABEL_LEN, true);
959 } else if (count > QUERY_CMD_LABELALL_LEN &&
960 !memcmp(t->data, QUERY_CMD_LABELALL,
961 QUERY_CMD_LABELALL_LEN)) {
962 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
963 t->data + QUERY_CMD_LABELALL_LEN,
964 count - QUERY_CMD_LABELALL_LEN, false);
965 } else if (count > QUERY_CMD_DATA_LEN &&
966 !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
967 len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
968 t->data + QUERY_CMD_DATA_LEN,
969 count - QUERY_CMD_DATA_LEN);
974 put_multi_transaction(t);
978 multi_transaction_set(file, t, len);
983 static const struct file_operations aa_sfs_access = {
984 .write = aa_write_access,
985 .read = multi_transaction_read,
986 .release = multi_transaction_release,
987 .llseek = generic_file_llseek,
990 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
992 struct aa_sfs_entry *fs_file = seq->private;
997 switch (fs_file->v_type) {
998 case AA_SFS_TYPE_BOOLEAN:
999 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
1001 case AA_SFS_TYPE_STRING:
1002 seq_printf(seq, "%s\n", fs_file->v.string);
1004 case AA_SFS_TYPE_U64:
1005 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1008 /* Ignore unpritable entry types. */
1015 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1017 return single_open(file, aa_sfs_seq_show, inode->i_private);
1020 const struct file_operations aa_sfs_seq_file_ops = {
1021 .owner = THIS_MODULE,
1022 .open = aa_sfs_seq_open,
1024 .llseek = seq_lseek,
1025 .release = single_release,
1029 * profile based file operations
1030 * policy/profiles/XXXX/profiles/ *
1033 #define SEQ_PROFILE_FOPS(NAME) \
1034 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1036 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1039 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1040 .owner = THIS_MODULE, \
1041 .open = seq_profile_ ##NAME ##_open, \
1043 .llseek = seq_lseek, \
1044 .release = seq_profile_release, \
1047 static int seq_profile_open(struct inode *inode, struct file *file,
1048 int (*show)(struct seq_file *, void *))
1050 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1051 int error = single_open(file, show, proxy);
1054 file->private_data = NULL;
1055 aa_put_proxy(proxy);
1061 static int seq_profile_release(struct inode *inode, struct file *file)
1063 struct seq_file *seq = (struct seq_file *) file->private_data;
1065 aa_put_proxy(seq->private);
1066 return single_release(inode, file);
1069 static int seq_profile_name_show(struct seq_file *seq, void *v)
1071 struct aa_proxy *proxy = seq->private;
1072 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1073 struct aa_profile *profile = labels_profile(label);
1074 seq_printf(seq, "%s\n", profile->base.name);
1075 aa_put_label(label);
1080 static int seq_profile_mode_show(struct seq_file *seq, void *v)
1082 struct aa_proxy *proxy = seq->private;
1083 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1084 struct aa_profile *profile = labels_profile(label);
1085 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1086 aa_put_label(label);
1091 static int seq_profile_attach_show(struct seq_file *seq, void *v)
1093 struct aa_proxy *proxy = seq->private;
1094 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1095 struct aa_profile *profile = labels_profile(label);
1096 if (profile->attach.xmatch_str)
1097 seq_printf(seq, "%s\n", profile->attach.xmatch_str);
1098 else if (profile->attach.xmatch.dfa)
1099 seq_puts(seq, "<unknown>\n");
1101 seq_printf(seq, "%s\n", profile->base.name);
1102 aa_put_label(label);
1107 static int seq_profile_hash_show(struct seq_file *seq, void *v)
1109 struct aa_proxy *proxy = seq->private;
1110 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1111 struct aa_profile *profile = labels_profile(label);
1112 unsigned int i, size = aa_hash_size();
1114 if (profile->hash) {
1115 for (i = 0; i < size; i++)
1116 seq_printf(seq, "%.2x", profile->hash[i]);
1117 seq_putc(seq, '\n');
1119 aa_put_label(label);
1124 SEQ_PROFILE_FOPS(name);
1125 SEQ_PROFILE_FOPS(mode);
1126 SEQ_PROFILE_FOPS(attach);
1127 SEQ_PROFILE_FOPS(hash);
1130 * namespace based files
1131 * several root files and
1135 #define SEQ_NS_FOPS(NAME) \
1136 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1138 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1141 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1142 .owner = THIS_MODULE, \
1143 .open = seq_ns_ ##NAME ##_open, \
1145 .llseek = seq_lseek, \
1146 .release = single_release, \
1149 static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1151 struct aa_label *label;
1153 label = begin_current_label_crit_section();
1154 seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
1155 end_current_label_crit_section(label);
1160 static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
1162 struct aa_label *label;
1163 struct aa_profile *profile;
1167 label = begin_current_label_crit_section();
1169 if (label->size > 1) {
1170 label_for_each(it, label, profile)
1171 if (profile->ns != labels_ns(label)) {
1177 seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
1178 end_current_label_crit_section(label);
1183 static int seq_ns_level_show(struct seq_file *seq, void *v)
1185 struct aa_label *label;
1187 label = begin_current_label_crit_section();
1188 seq_printf(seq, "%d\n", labels_ns(label)->level);
1189 end_current_label_crit_section(label);
1194 static int seq_ns_name_show(struct seq_file *seq, void *v)
1196 struct aa_label *label = begin_current_label_crit_section();
1197 seq_printf(seq, "%s\n", labels_ns(label)->base.name);
1198 end_current_label_crit_section(label);
1203 static int seq_ns_compress_min_show(struct seq_file *seq, void *v)
1205 seq_printf(seq, "%d\n", AA_MIN_CLEVEL);
1209 static int seq_ns_compress_max_show(struct seq_file *seq, void *v)
1211 seq_printf(seq, "%d\n", AA_MAX_CLEVEL);
1215 SEQ_NS_FOPS(stacked);
1216 SEQ_NS_FOPS(nsstacked);
1219 SEQ_NS_FOPS(compress_min);
1220 SEQ_NS_FOPS(compress_max);
1223 /* policy/raw_data/ * file ops */
1224 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1225 #define SEQ_RAWDATA_FOPS(NAME) \
1226 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1228 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1231 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1232 .owner = THIS_MODULE, \
1233 .open = seq_rawdata_ ##NAME ##_open, \
1235 .llseek = seq_lseek, \
1236 .release = seq_rawdata_release, \
1239 static int seq_rawdata_open(struct inode *inode, struct file *file,
1240 int (*show)(struct seq_file *, void *))
1242 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1246 /* lost race this ent is being reaped */
1249 error = single_open(file, show, data);
1251 AA_BUG(file->private_data &&
1252 ((struct seq_file *)file->private_data)->private);
1253 aa_put_loaddata(data);
1259 static int seq_rawdata_release(struct inode *inode, struct file *file)
1261 struct seq_file *seq = (struct seq_file *) file->private_data;
1264 aa_put_loaddata(seq->private);
1266 return single_release(inode, file);
1269 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1271 struct aa_loaddata *data = seq->private;
1273 seq_printf(seq, "v%d\n", data->abi);
1278 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1280 struct aa_loaddata *data = seq->private;
1282 seq_printf(seq, "%ld\n", data->revision);
1287 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1289 struct aa_loaddata *data = seq->private;
1290 unsigned int i, size = aa_hash_size();
1293 for (i = 0; i < size; i++)
1294 seq_printf(seq, "%.2x", data->hash[i]);
1295 seq_putc(seq, '\n');
1301 static int seq_rawdata_compressed_size_show(struct seq_file *seq, void *v)
1303 struct aa_loaddata *data = seq->private;
1305 seq_printf(seq, "%zu\n", data->compressed_size);
1310 SEQ_RAWDATA_FOPS(abi);
1311 SEQ_RAWDATA_FOPS(revision);
1312 SEQ_RAWDATA_FOPS(hash);
1313 SEQ_RAWDATA_FOPS(compressed_size);
1315 static int decompress_zstd(char *src, size_t slen, char *dst, size_t dlen)
1317 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1319 const size_t wksp_len = zstd_dctx_workspace_bound();
1325 wksp = kvzalloc(wksp_len, GFP_KERNEL);
1330 ctx = zstd_init_dctx(wksp, wksp_len);
1335 out_len = zstd_decompress_dctx(ctx, dst, dlen, src, slen);
1336 if (zstd_is_error(out_len)) {
1348 memcpy(dst, src, slen);
1352 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1355 struct rawdata_f_data *private = file->private_data;
1357 return simple_read_from_buffer(buf, size, ppos,
1358 RAWDATA_F_DATA_BUF(private),
1359 private->loaddata->size);
1362 static int rawdata_release(struct inode *inode, struct file *file)
1364 rawdata_f_data_free(file->private_data);
1369 static int rawdata_open(struct inode *inode, struct file *file)
1372 struct aa_loaddata *loaddata;
1373 struct rawdata_f_data *private;
1375 if (!aa_current_policy_view_capable(NULL))
1378 loaddata = __aa_get_loaddata(inode->i_private);
1380 /* lost race: this entry is being reaped */
1383 private = rawdata_f_data_alloc(loaddata->size);
1384 if (IS_ERR(private)) {
1385 error = PTR_ERR(private);
1386 goto fail_private_alloc;
1389 private->loaddata = loaddata;
1391 error = decompress_zstd(loaddata->data, loaddata->compressed_size,
1392 RAWDATA_F_DATA_BUF(private),
1395 goto fail_decompress;
1397 file->private_data = private;
1401 rawdata_f_data_free(private);
1405 aa_put_loaddata(loaddata);
1409 static const struct file_operations rawdata_fops = {
1410 .open = rawdata_open,
1411 .read = rawdata_read,
1412 .llseek = generic_file_llseek,
1413 .release = rawdata_release,
1416 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1420 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1421 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1422 /* no refcounts on i_private */
1423 aafs_remove(rawdata->dents[i]);
1424 rawdata->dents[i] = NULL;
1429 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1431 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1434 remove_rawdata_dents(rawdata);
1435 list_del_init(&rawdata->list);
1436 aa_put_ns(rawdata->ns);
1441 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1443 struct dentry *dent, *dir;
1447 AA_BUG(!mutex_is_locked(&ns->lock));
1448 AA_BUG(!ns_subdata_dir(ns));
1451 * just use ns revision dir was originally created at. This is
1452 * under ns->lock and if load is successful revision will be
1453 * bumped and is guaranteed to be unique
1455 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1459 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1461 /* ->name freed when rawdata freed */
1462 return PTR_ERR(dir);
1463 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1465 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1466 &seq_rawdata_abi_fops);
1469 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1471 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1472 &seq_rawdata_revision_fops);
1475 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1477 if (aa_g_hash_policy) {
1478 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1479 rawdata, &seq_rawdata_hash_fops);
1482 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1485 dent = aafs_create_file("compressed_size", S_IFREG | 0444, dir,
1487 &seq_rawdata_compressed_size_fops);
1490 rawdata->dents[AAFS_LOADDATA_COMPRESSED_SIZE] = dent;
1492 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1493 dir, rawdata, &rawdata_fops);
1496 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1497 d_inode(dent)->i_size = rawdata->size;
1499 rawdata->ns = aa_get_ns(ns);
1500 list_add(&rawdata->list, &ns->rawdata_list);
1501 /* no refcount on inode rawdata */
1506 remove_rawdata_dents(rawdata);
1508 return PTR_ERR(dent);
1510 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1513 /** fns to setup dynamic per profile/namespace files **/
1517 * Requires: @profile->ns->lock held
1519 void __aafs_profile_rmdir(struct aa_profile *profile)
1521 struct aa_profile *child;
1527 list_for_each_entry(child, &profile->base.profiles, base.list)
1528 __aafs_profile_rmdir(child);
1530 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1531 struct aa_proxy *proxy;
1532 if (!profile->dents[i])
1535 proxy = d_inode(profile->dents[i])->i_private;
1536 aafs_remove(profile->dents[i]);
1537 aa_put_proxy(proxy);
1538 profile->dents[i] = NULL;
1544 * Requires: @old->ns->lock held
1546 void __aafs_profile_migrate_dents(struct aa_profile *old,
1547 struct aa_profile *new)
1553 AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
1555 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1556 new->dents[i] = old->dents[i];
1557 if (new->dents[i]) {
1558 struct inode *inode = d_inode(new->dents[i]);
1560 inode->i_mtime = inode_set_ctime_current(inode);
1562 old->dents[i] = NULL;
1566 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1567 struct aa_profile *profile,
1568 const struct file_operations *fops)
1570 struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1571 struct dentry *dent;
1573 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1575 aa_put_proxy(proxy);
1580 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1581 static int profile_depth(struct aa_profile *profile)
1586 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1593 static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
1597 int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
1599 s = buffer = kmalloc(size, GFP_KERNEL);
1601 return ERR_PTR(-ENOMEM);
1603 for (; depth > 0; depth--) {
1604 strcpy(s, "../../");
1609 error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
1610 if (error >= size || error < 0) {
1612 return ERR_PTR(-ENAMETOOLONG);
1618 static void rawdata_link_cb(void *arg)
1623 static const char *rawdata_get_link_base(struct dentry *dentry,
1624 struct inode *inode,
1625 struct delayed_call *done,
1628 struct aa_proxy *proxy = inode->i_private;
1629 struct aa_label *label;
1630 struct aa_profile *profile;
1635 return ERR_PTR(-ECHILD);
1637 label = aa_get_label_rcu(&proxy->label);
1638 profile = labels_profile(label);
1639 depth = profile_depth(profile);
1640 target = gen_symlink_name(depth, profile->rawdata->name, name);
1641 aa_put_label(label);
1646 set_delayed_call(done, rawdata_link_cb, target);
1651 static const char *rawdata_get_link_sha1(struct dentry *dentry,
1652 struct inode *inode,
1653 struct delayed_call *done)
1655 return rawdata_get_link_base(dentry, inode, done, "sha1");
1658 static const char *rawdata_get_link_abi(struct dentry *dentry,
1659 struct inode *inode,
1660 struct delayed_call *done)
1662 return rawdata_get_link_base(dentry, inode, done, "abi");
1665 static const char *rawdata_get_link_data(struct dentry *dentry,
1666 struct inode *inode,
1667 struct delayed_call *done)
1669 return rawdata_get_link_base(dentry, inode, done, "raw_data");
1672 static const struct inode_operations rawdata_link_sha1_iops = {
1673 .get_link = rawdata_get_link_sha1,
1676 static const struct inode_operations rawdata_link_abi_iops = {
1677 .get_link = rawdata_get_link_abi,
1679 static const struct inode_operations rawdata_link_data_iops = {
1680 .get_link = rawdata_get_link_data,
1682 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1685 * Requires: @profile->ns->lock held
1687 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1689 struct aa_profile *child;
1690 struct dentry *dent = NULL, *dir;
1694 AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
1697 struct aa_profile *p;
1698 p = aa_deref_parent(profile);
1700 /* adding to parent that previously didn't have children */
1701 dent = aafs_create_dir("profiles", dent);
1704 prof_child_dir(p) = parent = dent;
1707 if (!profile->dirname) {
1709 len = mangle_name(profile->base.name, NULL);
1710 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1712 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1713 if (!profile->dirname) {
1718 mangle_name(profile->base.name, profile->dirname);
1719 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1722 dent = aafs_create_dir(profile->dirname, parent);
1725 prof_dir(profile) = dir = dent;
1727 dent = create_profile_file(dir, "name", profile,
1728 &seq_profile_name_fops);
1731 profile->dents[AAFS_PROF_NAME] = dent;
1733 dent = create_profile_file(dir, "mode", profile,
1734 &seq_profile_mode_fops);
1737 profile->dents[AAFS_PROF_MODE] = dent;
1739 dent = create_profile_file(dir, "attach", profile,
1740 &seq_profile_attach_fops);
1743 profile->dents[AAFS_PROF_ATTACH] = dent;
1745 if (profile->hash) {
1746 dent = create_profile_file(dir, "sha1", profile,
1747 &seq_profile_hash_fops);
1750 profile->dents[AAFS_PROF_HASH] = dent;
1753 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1754 if (profile->rawdata) {
1755 if (aa_g_hash_policy) {
1756 dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir,
1757 profile->label.proxy, NULL, NULL,
1758 &rawdata_link_sha1_iops);
1761 aa_get_proxy(profile->label.proxy);
1762 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1764 dent = aafs_create("raw_abi", S_IFLNK | 0444, dir,
1765 profile->label.proxy, NULL, NULL,
1766 &rawdata_link_abi_iops);
1769 aa_get_proxy(profile->label.proxy);
1770 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1772 dent = aafs_create("raw_data", S_IFLNK | 0444, dir,
1773 profile->label.proxy, NULL, NULL,
1774 &rawdata_link_data_iops);
1777 aa_get_proxy(profile->label.proxy);
1778 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1780 #endif /*CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1782 list_for_each_entry(child, &profile->base.profiles, base.list) {
1783 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1791 error = PTR_ERR(dent);
1794 __aafs_profile_rmdir(profile);
1799 static int ns_mkdir_op(struct mnt_idmap *idmap, struct inode *dir,
1800 struct dentry *dentry, umode_t mode)
1802 struct aa_ns *ns, *parent;
1803 /* TODO: improve permission check */
1804 struct aa_label *label;
1807 label = begin_current_label_crit_section();
1808 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1809 end_current_label_crit_section(label);
1813 parent = aa_get_ns(dir->i_private);
1814 AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1816 /* we have to unlock and then relock to get locking order right
1820 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1821 mutex_lock_nested(&parent->lock, parent->level);
1822 inode_lock_nested(dir, I_MUTEX_PARENT);
1826 error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
1831 ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1834 error = PTR_ERR(ns);
1838 aa_put_ns(ns); /* list ref remains */
1841 simple_release_fs(&aafs_mnt, &aafs_count);
1843 mutex_unlock(&parent->lock);
1849 static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1851 struct aa_ns *ns, *parent;
1852 /* TODO: improve permission check */
1853 struct aa_label *label;
1856 label = begin_current_label_crit_section();
1857 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1858 end_current_label_crit_section(label);
1862 parent = aa_get_ns(dir->i_private);
1863 /* rmdir calls the generic securityfs functions to remove files
1864 * from the apparmor dir. It is up to the apparmor ns locking
1868 inode_unlock(dentry->d_inode);
1870 mutex_lock_nested(&parent->lock, parent->level);
1871 ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1872 dentry->d_name.len));
1877 AA_BUG(ns_dir(ns) != dentry);
1883 mutex_unlock(&parent->lock);
1884 inode_lock_nested(dir, I_MUTEX_PARENT);
1885 inode_lock(dentry->d_inode);
1891 static const struct inode_operations ns_dir_inode_operations = {
1892 .lookup = simple_lookup,
1893 .mkdir = ns_mkdir_op,
1894 .rmdir = ns_rmdir_op,
1897 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1899 struct aa_loaddata *ent, *tmp;
1901 AA_BUG(!mutex_is_locked(&ns->lock));
1903 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1904 __aa_fs_remove_rawdata(ent);
1909 * Requires: @ns->lock held
1911 void __aafs_ns_rmdir(struct aa_ns *ns)
1914 struct aa_profile *child;
1919 AA_BUG(!mutex_is_locked(&ns->lock));
1921 list_for_each_entry(child, &ns->base.profiles, base.list)
1922 __aafs_profile_rmdir(child);
1924 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1925 mutex_lock_nested(&sub->lock, sub->level);
1926 __aafs_ns_rmdir(sub);
1927 mutex_unlock(&sub->lock);
1930 __aa_fs_list_remove_rawdata(ns);
1932 if (ns_subns_dir(ns)) {
1933 sub = d_inode(ns_subns_dir(ns))->i_private;
1936 if (ns_subload(ns)) {
1937 sub = d_inode(ns_subload(ns))->i_private;
1940 if (ns_subreplace(ns)) {
1941 sub = d_inode(ns_subreplace(ns))->i_private;
1944 if (ns_subremove(ns)) {
1945 sub = d_inode(ns_subremove(ns))->i_private;
1948 if (ns_subrevision(ns)) {
1949 sub = d_inode(ns_subrevision(ns))->i_private;
1953 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1954 aafs_remove(ns->dents[i]);
1955 ns->dents[i] = NULL;
1959 /* assumes cleanup in caller */
1960 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1962 struct dentry *dent;
1967 dent = aafs_create_dir("profiles", dir);
1969 return PTR_ERR(dent);
1970 ns_subprofs_dir(ns) = dent;
1972 dent = aafs_create_dir("raw_data", dir);
1974 return PTR_ERR(dent);
1975 ns_subdata_dir(ns) = dent;
1977 dent = aafs_create_file("revision", 0444, dir, ns,
1978 &aa_fs_ns_revision_fops);
1980 return PTR_ERR(dent);
1982 ns_subrevision(ns) = dent;
1984 dent = aafs_create_file(".load", 0640, dir, ns,
1985 &aa_fs_profile_load);
1987 return PTR_ERR(dent);
1989 ns_subload(ns) = dent;
1991 dent = aafs_create_file(".replace", 0640, dir, ns,
1992 &aa_fs_profile_replace);
1994 return PTR_ERR(dent);
1996 ns_subreplace(ns) = dent;
1998 dent = aafs_create_file(".remove", 0640, dir, ns,
1999 &aa_fs_profile_remove);
2001 return PTR_ERR(dent);
2003 ns_subremove(ns) = dent;
2005 /* use create_dentry so we can supply private data */
2006 dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
2007 &ns_dir_inode_operations);
2009 return PTR_ERR(dent);
2011 ns_subns_dir(ns) = dent;
2017 * Requires: @ns->lock held
2019 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
2020 struct dentry *dent)
2023 struct aa_profile *child;
2029 AA_BUG(!mutex_is_locked(&ns->lock));
2032 name = ns->base.name;
2035 /* create ns dir if it doesn't already exist */
2036 dent = aafs_create_dir(name, parent);
2041 ns_dir(ns) = dir = dent;
2042 error = __aafs_ns_mkdir_entries(ns, dir);
2047 list_for_each_entry(child, &ns->base.profiles, base.list) {
2048 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
2054 list_for_each_entry(sub, &ns->sub_ns, base.list) {
2055 mutex_lock_nested(&sub->lock, sub->level);
2056 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
2057 mutex_unlock(&sub->lock);
2065 error = PTR_ERR(dent);
2068 __aafs_ns_rmdir(ns);
2074 * __next_ns - find the next namespace to list
2075 * @root: root namespace to stop search at (NOT NULL)
2076 * @ns: current ns position (NOT NULL)
2078 * Find the next namespace from @ns under @root and handle all locking needed
2079 * while switching current namespace.
2081 * Returns: next namespace or NULL if at last namespace under @root
2082 * Requires: ns->parent->lock to be held
2083 * NOTE: will not unlock root->lock
2085 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
2087 struct aa_ns *parent, *next;
2091 AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
2093 /* is next namespace a child */
2094 if (!list_empty(&ns->sub_ns)) {
2095 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
2096 mutex_lock_nested(&next->lock, next->level);
2100 /* check if the next ns is a sibling, parent, gp, .. */
2101 parent = ns->parent;
2102 while (ns != root) {
2103 mutex_unlock(&ns->lock);
2104 next = list_next_entry(ns, base.list);
2105 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
2106 mutex_lock_nested(&next->lock, next->level);
2110 parent = parent->parent;
2117 * __first_profile - find the first profile in a namespace
2118 * @root: namespace that is root of profiles being displayed (NOT NULL)
2119 * @ns: namespace to start in (NOT NULL)
2121 * Returns: unrefcounted profile or NULL if no profile
2122 * Requires: profile->ns.lock to be held
2124 static struct aa_profile *__first_profile(struct aa_ns *root,
2128 AA_BUG(ns && !mutex_is_locked(&ns->lock));
2130 for (; ns; ns = __next_ns(root, ns)) {
2131 if (!list_empty(&ns->base.profiles))
2132 return list_first_entry(&ns->base.profiles,
2133 struct aa_profile, base.list);
2139 * __next_profile - step to the next profile in a profile tree
2140 * @p: current profile in tree (NOT NULL)
2142 * Perform a depth first traversal on the profile tree in a namespace
2144 * Returns: next profile or NULL if done
2145 * Requires: profile->ns.lock to be held
2147 static struct aa_profile *__next_profile(struct aa_profile *p)
2149 struct aa_profile *parent;
2150 struct aa_ns *ns = p->ns;
2152 AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
2154 /* is next profile a child */
2155 if (!list_empty(&p->base.profiles))
2156 return list_first_entry(&p->base.profiles, typeof(*p),
2159 /* is next profile a sibling, parent sibling, gp, sibling, .. */
2160 parent = rcu_dereference_protected(p->parent,
2161 mutex_is_locked(&p->ns->lock));
2163 p = list_next_entry(p, base.list);
2164 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
2167 parent = rcu_dereference_protected(parent->parent,
2168 mutex_is_locked(&parent->ns->lock));
2171 /* is next another profile in the namespace */
2172 p = list_next_entry(p, base.list);
2173 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
2180 * next_profile - step to the next profile in where ever it may be
2181 * @root: root namespace (NOT NULL)
2182 * @profile: current profile (NOT NULL)
2184 * Returns: next profile or NULL if there isn't one
2186 static struct aa_profile *next_profile(struct aa_ns *root,
2187 struct aa_profile *profile)
2189 struct aa_profile *next = __next_profile(profile);
2193 /* finished all profiles in namespace move to next namespace */
2194 return __first_profile(root, __next_ns(root, profile->ns));
2198 * p_start - start a depth first traversal of profile tree
2199 * @f: seq_file to fill
2200 * @pos: current position
2202 * Returns: first profile under current namespace or NULL if none found
2204 * acquires first ns->lock
2206 static void *p_start(struct seq_file *f, loff_t *pos)
2208 struct aa_profile *profile = NULL;
2209 struct aa_ns *root = aa_get_current_ns();
2213 /* find the first profile */
2214 mutex_lock_nested(&root->lock, root->level);
2215 profile = __first_profile(root, root);
2217 /* skip to position */
2218 for (; profile && l > 0; l--)
2219 profile = next_profile(root, profile);
2225 * p_next - read the next profile entry
2226 * @f: seq_file to fill
2227 * @p: profile previously returned
2228 * @pos: current position
2230 * Returns: next profile after @p or NULL if none
2232 * may acquire/release locks in namespace tree as necessary
2234 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2236 struct aa_profile *profile = p;
2237 struct aa_ns *ns = f->private;
2240 return next_profile(ns, profile);
2244 * p_stop - stop depth first traversal
2245 * @f: seq_file we are filling
2246 * @p: the last profile writen
2248 * Release all locking done by p_start/p_next on namespace tree
2250 static void p_stop(struct seq_file *f, void *p)
2252 struct aa_profile *profile = p;
2253 struct aa_ns *root = f->private, *ns;
2256 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2257 mutex_unlock(&ns->lock);
2259 mutex_unlock(&root->lock);
2264 * seq_show_profile - show a profile entry
2265 * @f: seq_file to file
2266 * @p: current position (profile) (NOT NULL)
2268 * Returns: error on failure
2270 static int seq_show_profile(struct seq_file *f, void *p)
2272 struct aa_profile *profile = (struct aa_profile *)p;
2273 struct aa_ns *root = f->private;
2275 aa_label_seq_xprint(f, root, &profile->label,
2276 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2282 static const struct seq_operations aa_sfs_profiles_op = {
2286 .show = seq_show_profile,
2289 static int profiles_open(struct inode *inode, struct file *file)
2291 if (!aa_current_policy_view_capable(NULL))
2294 return seq_open(file, &aa_sfs_profiles_op);
2297 static int profiles_release(struct inode *inode, struct file *file)
2299 return seq_release(inode, file);
2302 static const struct file_operations aa_sfs_profiles_fops = {
2303 .open = profiles_open,
2305 .llseek = seq_lseek,
2306 .release = profiles_release,
2310 /** Base file system setup **/
2311 static struct aa_sfs_entry aa_sfs_entry_file[] = {
2312 AA_SFS_FILE_STRING("mask",
2313 "create read write exec append mmap_exec link lock"),
2317 static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2318 AA_SFS_FILE_STRING("mask", "read trace"),
2322 static struct aa_sfs_entry aa_sfs_entry_signal[] = {
2323 AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
2327 static struct aa_sfs_entry aa_sfs_entry_attach[] = {
2328 AA_SFS_FILE_BOOLEAN("xattr", 1),
2331 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2332 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2333 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2334 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2335 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2336 AA_SFS_FILE_BOOLEAN("stack", 1),
2337 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2338 AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1),
2339 AA_SFS_FILE_BOOLEAN("computed_longest_left", 1),
2340 AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach),
2341 AA_SFS_FILE_STRING("version", "1.2"),
2345 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2346 AA_SFS_FILE_BOOLEAN("v5", 1),
2347 AA_SFS_FILE_BOOLEAN("v6", 1),
2348 AA_SFS_FILE_BOOLEAN("v7", 1),
2349 AA_SFS_FILE_BOOLEAN("v8", 1),
2350 AA_SFS_FILE_BOOLEAN("v9", 1),
2354 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2355 AA_SFS_DIR("versions", aa_sfs_entry_versions),
2356 AA_SFS_FILE_BOOLEAN("set_load", 1),
2357 /* number of out of band transitions supported */
2358 AA_SFS_FILE_U64("outofband", MAX_OOB_SUPPORTED),
2362 static struct aa_sfs_entry aa_sfs_entry_mount[] = {
2363 AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
2367 static struct aa_sfs_entry aa_sfs_entry_ns[] = {
2368 AA_SFS_FILE_BOOLEAN("profile", 1),
2369 AA_SFS_FILE_BOOLEAN("pivot_root", 0),
2373 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2374 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2375 AA_SFS_FILE_BOOLEAN("data", 1),
2376 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2380 static struct aa_sfs_entry aa_sfs_entry_query[] = {
2381 AA_SFS_DIR("label", aa_sfs_entry_query_label),
2384 static struct aa_sfs_entry aa_sfs_entry_features[] = {
2385 AA_SFS_DIR("policy", aa_sfs_entry_policy),
2386 AA_SFS_DIR("domain", aa_sfs_entry_domain),
2387 AA_SFS_DIR("file", aa_sfs_entry_file),
2388 AA_SFS_DIR("network_v8", aa_sfs_entry_network),
2389 AA_SFS_DIR("mount", aa_sfs_entry_mount),
2390 AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
2391 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
2392 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
2393 AA_SFS_DIR("caps", aa_sfs_entry_caps),
2394 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
2395 AA_SFS_DIR("signal", aa_sfs_entry_signal),
2396 AA_SFS_DIR("query", aa_sfs_entry_query),
2400 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2401 AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
2402 AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
2403 AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
2404 AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
2405 AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
2406 AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
2407 AA_SFS_FILE_FOPS("raw_data_compression_level_min", 0444, &seq_ns_compress_min_fops),
2408 AA_SFS_FILE_FOPS("raw_data_compression_level_max", 0444, &seq_ns_compress_max_fops),
2409 AA_SFS_DIR("features", aa_sfs_entry_features),
2413 static struct aa_sfs_entry aa_sfs_entry =
2414 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2417 * entry_create_file - create a file entry in the apparmor securityfs
2418 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2419 * @parent: the parent dentry in the securityfs
2421 * Use entry_remove_file to remove entries created with this fn.
2423 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2424 struct dentry *parent)
2428 fs_file->dentry = securityfs_create_file(fs_file->name,
2429 S_IFREG | fs_file->mode,
2432 if (IS_ERR(fs_file->dentry)) {
2433 error = PTR_ERR(fs_file->dentry);
2434 fs_file->dentry = NULL;
2439 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2441 * entry_create_dir - recursively create a directory entry in the securityfs
2442 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2443 * @parent: the parent dentry in the securityfs
2445 * Use entry_remove_dir to remove entries created with this fn.
2447 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2448 struct dentry *parent)
2450 struct aa_sfs_entry *fs_file;
2454 dir = securityfs_create_dir(fs_dir->name, parent);
2456 return PTR_ERR(dir);
2457 fs_dir->dentry = dir;
2459 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2460 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2461 error = entry_create_dir(fs_file, fs_dir->dentry);
2463 error = entry_create_file(fs_file, fs_dir->dentry);
2471 entry_remove_dir(fs_dir);
2477 * entry_remove_file - drop a single file entry in the apparmor securityfs
2478 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2480 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2482 if (!fs_file->dentry)
2485 securityfs_remove(fs_file->dentry);
2486 fs_file->dentry = NULL;
2490 * entry_remove_dir - recursively drop a directory entry from the securityfs
2491 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2493 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2495 struct aa_sfs_entry *fs_file;
2497 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2498 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2499 entry_remove_dir(fs_file);
2501 entry_remove_file(fs_file);
2504 entry_remove_file(fs_dir);
2508 * aa_destroy_aafs - cleanup and free aafs
2510 * releases dentries allocated by aa_create_aafs
2512 void __init aa_destroy_aafs(void)
2514 entry_remove_dir(&aa_sfs_entry);
2518 #define NULL_FILE_NAME ".null"
2519 struct path aa_null;
2521 static int aa_mk_null_file(struct dentry *parent)
2523 struct vfsmount *mount = NULL;
2524 struct dentry *dentry;
2525 struct inode *inode;
2527 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2532 inode_lock(d_inode(parent));
2533 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2534 if (IS_ERR(dentry)) {
2535 error = PTR_ERR(dentry);
2538 inode = new_inode(parent->d_inode->i_sb);
2544 inode->i_ino = get_next_ino();
2545 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2546 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode);
2547 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2548 MKDEV(MEM_MAJOR, 3));
2549 d_instantiate(dentry, inode);
2550 aa_null.dentry = dget(dentry);
2551 aa_null.mnt = mntget(mount);
2558 inode_unlock(d_inode(parent));
2559 simple_release_fs(&mount, &count);
2565 static const char *policy_get_link(struct dentry *dentry,
2566 struct inode *inode,
2567 struct delayed_call *done)
2574 return ERR_PTR(-ECHILD);
2576 ns = aa_get_current_ns();
2577 path.mnt = mntget(aafs_mnt);
2578 path.dentry = dget(ns_dir(ns));
2579 error = nd_jump_link(&path);
2582 return ERR_PTR(error);
2585 static int policy_readlink(struct dentry *dentry, char __user *buffer,
2591 res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
2592 d_inode(dentry)->i_ino);
2593 if (res > 0 && res < sizeof(name))
2594 res = readlink_copy(buffer, buflen, name);
2601 static const struct inode_operations policy_link_iops = {
2602 .readlink = policy_readlink,
2603 .get_link = policy_get_link,
2608 * aa_create_aafs - create the apparmor security filesystem
2610 * dentries created here are released by aa_destroy_aafs
2612 * Returns: error on failure
2614 static int __init aa_create_aafs(void)
2616 struct dentry *dent;
2619 if (!apparmor_initialized)
2622 if (aa_sfs_entry.dentry) {
2623 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2627 /* setup apparmorfs used to virtualize policy/ */
2628 aafs_mnt = kern_mount(&aafs_ops);
2629 if (IS_ERR(aafs_mnt))
2630 panic("can't set apparmorfs up\n");
2631 aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
2633 /* Populate fs tree. */
2634 error = entry_create_dir(&aa_sfs_entry, NULL);
2638 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2639 NULL, &aa_fs_profile_load);
2642 ns_subload(root_ns) = dent;
2644 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2645 NULL, &aa_fs_profile_replace);
2648 ns_subreplace(root_ns) = dent;
2650 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2651 NULL, &aa_fs_profile_remove);
2654 ns_subremove(root_ns) = dent;
2656 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2657 NULL, &aa_fs_ns_revision_fops);
2660 ns_subrevision(root_ns) = dent;
2662 /* policy tree referenced by magic policy symlink */
2663 mutex_lock_nested(&root_ns->lock, root_ns->level);
2664 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2665 aafs_mnt->mnt_root);
2666 mutex_unlock(&root_ns->lock);
2670 /* magic symlink similar to nsfs redirects based on task policy */
2671 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2672 NULL, &policy_link_iops);
2676 error = aa_mk_null_file(aa_sfs_entry.dentry);
2680 /* TODO: add default profile to apparmorfs */
2682 /* Report that AppArmor fs is enabled */
2683 aa_info_message("AppArmor Filesystem Enabled");
2687 error = PTR_ERR(dent);
2690 AA_ERROR("Error creating AppArmor securityfs\n");
2694 fs_initcall(aa_create_aafs);