1 // SPDX-License-Identifier: GPL-2.0-only
3 * AppArmor security module
5 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
11 #include <linux/ctype.h>
12 #include <linux/security.h>
13 #include <linux/vmalloc.h>
14 #include <linux/init.h>
15 #include <linux/seq_file.h>
16 #include <linux/uaccess.h>
17 #include <linux/mount.h>
18 #include <linux/namei.h>
19 #include <linux/capability.h>
20 #include <linux/rcupdate.h>
22 #include <linux/fs_context.h>
23 #include <linux/poll.h>
24 #include <linux/zlib.h>
25 #include <uapi/linux/major.h>
26 #include <uapi/linux/magic.h>
28 #include "include/apparmor.h"
29 #include "include/apparmorfs.h"
30 #include "include/audit.h"
31 #include "include/cred.h"
32 #include "include/crypto.h"
33 #include "include/ipc.h"
34 #include "include/label.h"
35 #include "include/policy.h"
36 #include "include/policy_ns.h"
37 #include "include/resource.h"
38 #include "include/policy_unpack.h"
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->i_ctime = current_time(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_perms tmp = { };
616 unsigned int state = 0;
618 if (profile_unconfined(profile))
620 if (profile->file.dfa && *match_str == AA_CLASS_FILE) {
621 dfa = profile->file.dfa;
622 state = aa_dfa_match_len(dfa, profile->file.start,
623 match_str + 1, match_len - 1);
625 struct path_cond cond = { };
627 tmp = aa_compute_fperms(dfa, state, &cond);
629 } else if (profile->policy.dfa) {
630 if (!PROFILE_MEDIATES(profile, *match_str))
631 return; /* no change to current perms */
632 dfa = profile->policy.dfa;
633 state = aa_dfa_match_len(dfa, profile->policy.start[0],
634 match_str, match_len);
636 aa_compute_perms(dfa, state, &tmp);
638 aa_apply_modes_to_perms(profile, &tmp);
639 aa_perms_accum_raw(perms, &tmp);
644 * query_data - queries a policy and writes its data to buf
645 * @buf: the resulting data is stored here (NOT NULL)
646 * @buf_len: size of buf
647 * @query: query string used to retrieve data
648 * @query_len: size of query including second NUL byte
650 * The buffers pointed to by buf and query may overlap. The query buffer is
651 * parsed before buf is written to.
653 * The query should look like "<LABEL>\0<KEY>\0", where <LABEL> is the name of
654 * the security confinement context and <KEY> is the name of the data to
655 * retrieve. <LABEL> and <KEY> must not be NUL-terminated.
657 * Don't expect the contents of buf to be preserved on failure.
659 * Returns: number of characters written to buf or -errno on failure
661 static ssize_t query_data(char *buf, size_t buf_len,
662 char *query, size_t query_len)
667 struct aa_label *label, *curr;
668 struct aa_profile *profile;
669 struct aa_data *data;
674 return -EINVAL; /* need a query */
676 key = query + strnlen(query, query_len) + 1;
677 if (key + 1 >= query + query_len)
678 return -EINVAL; /* not enough space for a non-empty key */
679 if (key + strnlen(key, query + query_len - key) >= query + query_len)
680 return -EINVAL; /* must end with NUL */
682 if (buf_len < sizeof(bytes) + sizeof(blocks))
683 return -EINVAL; /* not enough space */
685 curr = begin_current_label_crit_section();
686 label = aa_label_parse(curr, query, GFP_KERNEL, false, false);
687 end_current_label_crit_section(curr);
689 return PTR_ERR(label);
691 /* We are going to leave space for two numbers. The first is the total
692 * number of bytes we are writing after the first number. This is so
693 * users can read the full output without reallocation.
695 * The second number is the number of data blocks we're writing. An
696 * application might be confined by multiple policies having data in
699 memset(buf, 0, sizeof(bytes) + sizeof(blocks));
700 out = buf + sizeof(bytes) + sizeof(blocks);
703 label_for_each_confined(i, label, profile) {
707 data = rhashtable_lookup_fast(profile->data, &key,
711 if (out + sizeof(outle32) + data->size > buf +
714 return -EINVAL; /* not enough space */
716 outle32 = __cpu_to_le32(data->size);
717 memcpy(out, &outle32, sizeof(outle32));
718 out += sizeof(outle32);
719 memcpy(out, data->data, data->size);
726 outle32 = __cpu_to_le32(out - buf - sizeof(bytes));
727 memcpy(buf, &outle32, sizeof(outle32));
728 outle32 = __cpu_to_le32(blocks);
729 memcpy(buf + sizeof(bytes), &outle32, sizeof(outle32));
735 * query_label - queries a label and writes permissions to buf
736 * @buf: the resulting permissions string is stored here (NOT NULL)
737 * @buf_len: size of buf
738 * @query: binary query string to match against the dfa
739 * @query_len: size of query
740 * @view_only: only compute for querier's view
742 * The buffers pointed to by buf and query may overlap. The query buffer is
743 * parsed before buf is written to.
745 * The query should look like "LABEL_NAME\0DFA_STRING" where LABEL_NAME is
746 * the name of the label, in the current namespace, that is to be queried and
747 * DFA_STRING is a binary string to match against the label(s)'s DFA.
749 * LABEL_NAME must be NUL terminated. DFA_STRING may contain NUL characters
750 * but must *not* be NUL terminated.
752 * Returns: number of characters written to buf or -errno on failure
754 static ssize_t query_label(char *buf, size_t buf_len,
755 char *query, size_t query_len, bool view_only)
757 struct aa_profile *profile;
758 struct aa_label *label, *curr;
759 char *label_name, *match_str;
760 size_t label_name_len, match_len;
761 struct aa_perms perms;
768 label_name_len = strnlen(query, query_len);
769 if (!label_name_len || label_name_len == query_len)
773 * The extra byte is to account for the null byte between the
774 * profile name and dfa string. profile_name_len is greater
775 * than zero and less than query_len, so a byte can be safely
776 * added or subtracted.
778 match_str = label_name + label_name_len + 1;
779 match_len = query_len - label_name_len - 1;
781 curr = begin_current_label_crit_section();
782 label = aa_label_parse(curr, label_name, GFP_KERNEL, false, false);
783 end_current_label_crit_section(curr);
785 return PTR_ERR(label);
789 label_for_each_in_ns(i, labels_ns(label), label, profile) {
790 profile_query_cb(profile, &perms, match_str, match_len);
793 label_for_each(i, label, profile) {
794 profile_query_cb(profile, &perms, match_str, match_len);
799 return scnprintf(buf, buf_len,
800 "allow 0x%08x\ndeny 0x%08x\naudit 0x%08x\nquiet 0x%08x\n",
801 perms.allow, perms.deny, perms.audit, perms.quiet);
805 * Transaction based IO.
806 * The file expects a write which triggers the transaction, and then
807 * possibly a read(s) which collects the result - which is stored in a
808 * file-local buffer. Once a new write is performed, a new set of results
809 * are stored in the file-local buffer.
811 struct multi_transaction {
817 #define MULTI_TRANSACTION_LIMIT (PAGE_SIZE - sizeof(struct multi_transaction))
819 static void multi_transaction_kref(struct kref *kref)
821 struct multi_transaction *t;
823 t = container_of(kref, struct multi_transaction, count);
824 free_page((unsigned long) t);
827 static struct multi_transaction *
828 get_multi_transaction(struct multi_transaction *t)
831 kref_get(&(t->count));
836 static void put_multi_transaction(struct multi_transaction *t)
839 kref_put(&(t->count), multi_transaction_kref);
842 /* does not increment @new's count */
843 static void multi_transaction_set(struct file *file,
844 struct multi_transaction *new, size_t n)
846 struct multi_transaction *old;
848 AA_BUG(n > MULTI_TRANSACTION_LIMIT);
851 spin_lock(&file->f_lock);
852 old = (struct multi_transaction *) file->private_data;
853 file->private_data = new;
854 spin_unlock(&file->f_lock);
855 put_multi_transaction(old);
858 static struct multi_transaction *multi_transaction_new(struct file *file,
859 const char __user *buf,
862 struct multi_transaction *t;
864 if (size > MULTI_TRANSACTION_LIMIT - 1)
865 return ERR_PTR(-EFBIG);
867 t = (struct multi_transaction *)get_zeroed_page(GFP_KERNEL);
869 return ERR_PTR(-ENOMEM);
870 kref_init(&t->count);
871 if (copy_from_user(t->data, buf, size)) {
872 put_multi_transaction(t);
873 return ERR_PTR(-EFAULT);
879 static ssize_t multi_transaction_read(struct file *file, char __user *buf,
880 size_t size, loff_t *pos)
882 struct multi_transaction *t;
885 spin_lock(&file->f_lock);
886 t = get_multi_transaction(file->private_data);
887 spin_unlock(&file->f_lock);
892 ret = simple_read_from_buffer(buf, size, pos, t->data, t->size);
893 put_multi_transaction(t);
898 static int multi_transaction_release(struct inode *inode, struct file *file)
900 put_multi_transaction(file->private_data);
905 #define QUERY_CMD_LABEL "label\0"
906 #define QUERY_CMD_LABEL_LEN 6
907 #define QUERY_CMD_PROFILE "profile\0"
908 #define QUERY_CMD_PROFILE_LEN 8
909 #define QUERY_CMD_LABELALL "labelall\0"
910 #define QUERY_CMD_LABELALL_LEN 9
911 #define QUERY_CMD_DATA "data\0"
912 #define QUERY_CMD_DATA_LEN 5
915 * aa_write_access - generic permissions and data query
916 * @file: pointer to open apparmorfs/access file
917 * @ubuf: user buffer containing the complete query string (NOT NULL)
918 * @count: size of ubuf
919 * @ppos: position in the file (MUST BE ZERO)
921 * Allows for one permissions or data query per open(), write(), and read()
922 * sequence. The only queries currently supported are label-based queries for
923 * permissions or data.
925 * For permissions queries, ubuf must begin with "label\0", followed by the
926 * profile query specific format described in the query_label() function
929 * For data queries, ubuf must have the form "data\0<LABEL>\0<KEY>\0", where
930 * <LABEL> is the name of the security confinement context and <KEY> is the
931 * name of the data to retrieve.
933 * Returns: number of bytes written or -errno on failure
935 static ssize_t aa_write_access(struct file *file, const char __user *ubuf,
936 size_t count, loff_t *ppos)
938 struct multi_transaction *t;
944 t = multi_transaction_new(file, ubuf, count);
948 if (count > QUERY_CMD_PROFILE_LEN &&
949 !memcmp(t->data, QUERY_CMD_PROFILE, QUERY_CMD_PROFILE_LEN)) {
950 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
951 t->data + QUERY_CMD_PROFILE_LEN,
952 count - QUERY_CMD_PROFILE_LEN, true);
953 } else if (count > QUERY_CMD_LABEL_LEN &&
954 !memcmp(t->data, QUERY_CMD_LABEL, QUERY_CMD_LABEL_LEN)) {
955 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
956 t->data + QUERY_CMD_LABEL_LEN,
957 count - QUERY_CMD_LABEL_LEN, true);
958 } else if (count > QUERY_CMD_LABELALL_LEN &&
959 !memcmp(t->data, QUERY_CMD_LABELALL,
960 QUERY_CMD_LABELALL_LEN)) {
961 len = query_label(t->data, MULTI_TRANSACTION_LIMIT,
962 t->data + QUERY_CMD_LABELALL_LEN,
963 count - QUERY_CMD_LABELALL_LEN, false);
964 } else if (count > QUERY_CMD_DATA_LEN &&
965 !memcmp(t->data, QUERY_CMD_DATA, QUERY_CMD_DATA_LEN)) {
966 len = query_data(t->data, MULTI_TRANSACTION_LIMIT,
967 t->data + QUERY_CMD_DATA_LEN,
968 count - QUERY_CMD_DATA_LEN);
973 put_multi_transaction(t);
977 multi_transaction_set(file, t, len);
982 static const struct file_operations aa_sfs_access = {
983 .write = aa_write_access,
984 .read = multi_transaction_read,
985 .release = multi_transaction_release,
986 .llseek = generic_file_llseek,
989 static int aa_sfs_seq_show(struct seq_file *seq, void *v)
991 struct aa_sfs_entry *fs_file = seq->private;
996 switch (fs_file->v_type) {
997 case AA_SFS_TYPE_BOOLEAN:
998 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
1000 case AA_SFS_TYPE_STRING:
1001 seq_printf(seq, "%s\n", fs_file->v.string);
1003 case AA_SFS_TYPE_U64:
1004 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
1007 /* Ignore unpritable entry types. */
1014 static int aa_sfs_seq_open(struct inode *inode, struct file *file)
1016 return single_open(file, aa_sfs_seq_show, inode->i_private);
1019 const struct file_operations aa_sfs_seq_file_ops = {
1020 .owner = THIS_MODULE,
1021 .open = aa_sfs_seq_open,
1023 .llseek = seq_lseek,
1024 .release = single_release,
1028 * profile based file operations
1029 * policy/profiles/XXXX/profiles/ *
1032 #define SEQ_PROFILE_FOPS(NAME) \
1033 static int seq_profile_ ##NAME ##_open(struct inode *inode, struct file *file)\
1035 return seq_profile_open(inode, file, seq_profile_ ##NAME ##_show); \
1038 static const struct file_operations seq_profile_ ##NAME ##_fops = { \
1039 .owner = THIS_MODULE, \
1040 .open = seq_profile_ ##NAME ##_open, \
1042 .llseek = seq_lseek, \
1043 .release = seq_profile_release, \
1046 static int seq_profile_open(struct inode *inode, struct file *file,
1047 int (*show)(struct seq_file *, void *))
1049 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
1050 int error = single_open(file, show, proxy);
1053 file->private_data = NULL;
1054 aa_put_proxy(proxy);
1060 static int seq_profile_release(struct inode *inode, struct file *file)
1062 struct seq_file *seq = (struct seq_file *) file->private_data;
1064 aa_put_proxy(seq->private);
1065 return single_release(inode, file);
1068 static int seq_profile_name_show(struct seq_file *seq, void *v)
1070 struct aa_proxy *proxy = seq->private;
1071 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1072 struct aa_profile *profile = labels_profile(label);
1073 seq_printf(seq, "%s\n", profile->base.name);
1074 aa_put_label(label);
1079 static int seq_profile_mode_show(struct seq_file *seq, void *v)
1081 struct aa_proxy *proxy = seq->private;
1082 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1083 struct aa_profile *profile = labels_profile(label);
1084 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
1085 aa_put_label(label);
1090 static int seq_profile_attach_show(struct seq_file *seq, void *v)
1092 struct aa_proxy *proxy = seq->private;
1093 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1094 struct aa_profile *profile = labels_profile(label);
1095 if (profile->attach)
1096 seq_printf(seq, "%s\n", profile->attach);
1097 else if (profile->xmatch)
1098 seq_puts(seq, "<unknown>\n");
1100 seq_printf(seq, "%s\n", profile->base.name);
1101 aa_put_label(label);
1106 static int seq_profile_hash_show(struct seq_file *seq, void *v)
1108 struct aa_proxy *proxy = seq->private;
1109 struct aa_label *label = aa_get_label_rcu(&proxy->label);
1110 struct aa_profile *profile = labels_profile(label);
1111 unsigned int i, size = aa_hash_size();
1113 if (profile->hash) {
1114 for (i = 0; i < size; i++)
1115 seq_printf(seq, "%.2x", profile->hash[i]);
1116 seq_putc(seq, '\n');
1118 aa_put_label(label);
1123 SEQ_PROFILE_FOPS(name);
1124 SEQ_PROFILE_FOPS(mode);
1125 SEQ_PROFILE_FOPS(attach);
1126 SEQ_PROFILE_FOPS(hash);
1129 * namespace based files
1130 * several root files and
1134 #define SEQ_NS_FOPS(NAME) \
1135 static int seq_ns_ ##NAME ##_open(struct inode *inode, struct file *file) \
1137 return single_open(file, seq_ns_ ##NAME ##_show, inode->i_private); \
1140 static const struct file_operations seq_ns_ ##NAME ##_fops = { \
1141 .owner = THIS_MODULE, \
1142 .open = seq_ns_ ##NAME ##_open, \
1144 .llseek = seq_lseek, \
1145 .release = single_release, \
1148 static int seq_ns_stacked_show(struct seq_file *seq, void *v)
1150 struct aa_label *label;
1152 label = begin_current_label_crit_section();
1153 seq_printf(seq, "%s\n", label->size > 1 ? "yes" : "no");
1154 end_current_label_crit_section(label);
1159 static int seq_ns_nsstacked_show(struct seq_file *seq, void *v)
1161 struct aa_label *label;
1162 struct aa_profile *profile;
1166 label = begin_current_label_crit_section();
1168 if (label->size > 1) {
1169 label_for_each(it, label, profile)
1170 if (profile->ns != labels_ns(label)) {
1176 seq_printf(seq, "%s\n", count > 1 ? "yes" : "no");
1177 end_current_label_crit_section(label);
1182 static int seq_ns_level_show(struct seq_file *seq, void *v)
1184 struct aa_label *label;
1186 label = begin_current_label_crit_section();
1187 seq_printf(seq, "%d\n", labels_ns(label)->level);
1188 end_current_label_crit_section(label);
1193 static int seq_ns_name_show(struct seq_file *seq, void *v)
1195 struct aa_label *label = begin_current_label_crit_section();
1196 seq_printf(seq, "%s\n", labels_ns(label)->base.name);
1197 end_current_label_crit_section(label);
1202 SEQ_NS_FOPS(stacked);
1203 SEQ_NS_FOPS(nsstacked);
1208 /* policy/raw_data/ * file ops */
1209 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1210 #define SEQ_RAWDATA_FOPS(NAME) \
1211 static int seq_rawdata_ ##NAME ##_open(struct inode *inode, struct file *file)\
1213 return seq_rawdata_open(inode, file, seq_rawdata_ ##NAME ##_show); \
1216 static const struct file_operations seq_rawdata_ ##NAME ##_fops = { \
1217 .owner = THIS_MODULE, \
1218 .open = seq_rawdata_ ##NAME ##_open, \
1220 .llseek = seq_lseek, \
1221 .release = seq_rawdata_release, \
1224 static int seq_rawdata_open(struct inode *inode, struct file *file,
1225 int (*show)(struct seq_file *, void *))
1227 struct aa_loaddata *data = __aa_get_loaddata(inode->i_private);
1231 /* lost race this ent is being reaped */
1234 error = single_open(file, show, data);
1236 AA_BUG(file->private_data &&
1237 ((struct seq_file *)file->private_data)->private);
1238 aa_put_loaddata(data);
1244 static int seq_rawdata_release(struct inode *inode, struct file *file)
1246 struct seq_file *seq = (struct seq_file *) file->private_data;
1249 aa_put_loaddata(seq->private);
1251 return single_release(inode, file);
1254 static int seq_rawdata_abi_show(struct seq_file *seq, void *v)
1256 struct aa_loaddata *data = seq->private;
1258 seq_printf(seq, "v%d\n", data->abi);
1263 static int seq_rawdata_revision_show(struct seq_file *seq, void *v)
1265 struct aa_loaddata *data = seq->private;
1267 seq_printf(seq, "%ld\n", data->revision);
1272 static int seq_rawdata_hash_show(struct seq_file *seq, void *v)
1274 struct aa_loaddata *data = seq->private;
1275 unsigned int i, size = aa_hash_size();
1278 for (i = 0; i < size; i++)
1279 seq_printf(seq, "%.2x", data->hash[i]);
1280 seq_putc(seq, '\n');
1286 static int seq_rawdata_compressed_size_show(struct seq_file *seq, void *v)
1288 struct aa_loaddata *data = seq->private;
1290 seq_printf(seq, "%zu\n", data->compressed_size);
1295 SEQ_RAWDATA_FOPS(abi);
1296 SEQ_RAWDATA_FOPS(revision);
1297 SEQ_RAWDATA_FOPS(hash);
1298 SEQ_RAWDATA_FOPS(compressed_size);
1300 static int deflate_decompress(char *src, size_t slen, char *dst, size_t dlen)
1302 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1303 if (aa_g_rawdata_compression_level != 0) {
1305 struct z_stream_s strm;
1307 memset(&strm, 0, sizeof(strm));
1309 strm.workspace = kvzalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
1310 if (!strm.workspace)
1314 strm.avail_in = slen;
1316 error = zlib_inflateInit(&strm);
1317 if (error != Z_OK) {
1319 goto fail_inflate_init;
1322 strm.next_out = dst;
1323 strm.avail_out = dlen;
1325 error = zlib_inflate(&strm, Z_FINISH);
1326 if (error != Z_STREAM_END)
1331 zlib_inflateEnd(&strm);
1333 kvfree(strm.workspace);
1341 memcpy(dst, src, slen);
1345 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
1348 struct rawdata_f_data *private = file->private_data;
1350 return simple_read_from_buffer(buf, size, ppos,
1351 RAWDATA_F_DATA_BUF(private),
1352 private->loaddata->size);
1355 static int rawdata_release(struct inode *inode, struct file *file)
1357 rawdata_f_data_free(file->private_data);
1362 static int rawdata_open(struct inode *inode, struct file *file)
1365 struct aa_loaddata *loaddata;
1366 struct rawdata_f_data *private;
1368 if (!aa_current_policy_view_capable(NULL))
1371 loaddata = __aa_get_loaddata(inode->i_private);
1373 /* lost race: this entry is being reaped */
1376 private = rawdata_f_data_alloc(loaddata->size);
1377 if (IS_ERR(private)) {
1378 error = PTR_ERR(private);
1379 goto fail_private_alloc;
1382 private->loaddata = loaddata;
1384 error = deflate_decompress(loaddata->data, loaddata->compressed_size,
1385 RAWDATA_F_DATA_BUF(private),
1388 goto fail_decompress;
1390 file->private_data = private;
1394 rawdata_f_data_free(private);
1398 aa_put_loaddata(loaddata);
1402 static const struct file_operations rawdata_fops = {
1403 .open = rawdata_open,
1404 .read = rawdata_read,
1405 .llseek = generic_file_llseek,
1406 .release = rawdata_release,
1409 static void remove_rawdata_dents(struct aa_loaddata *rawdata)
1413 for (i = 0; i < AAFS_LOADDATA_NDENTS; i++) {
1414 if (!IS_ERR_OR_NULL(rawdata->dents[i])) {
1415 /* no refcounts on i_private */
1416 aafs_remove(rawdata->dents[i]);
1417 rawdata->dents[i] = NULL;
1422 void __aa_fs_remove_rawdata(struct aa_loaddata *rawdata)
1424 AA_BUG(rawdata->ns && !mutex_is_locked(&rawdata->ns->lock));
1427 remove_rawdata_dents(rawdata);
1428 list_del_init(&rawdata->list);
1429 aa_put_ns(rawdata->ns);
1434 int __aa_fs_create_rawdata(struct aa_ns *ns, struct aa_loaddata *rawdata)
1436 struct dentry *dent, *dir;
1440 AA_BUG(!mutex_is_locked(&ns->lock));
1441 AA_BUG(!ns_subdata_dir(ns));
1444 * just use ns revision dir was originally created at. This is
1445 * under ns->lock and if load is successful revision will be
1446 * bumped and is guaranteed to be unique
1448 rawdata->name = kasprintf(GFP_KERNEL, "%ld", ns->revision);
1452 dir = aafs_create_dir(rawdata->name, ns_subdata_dir(ns));
1454 /* ->name freed when rawdata freed */
1455 return PTR_ERR(dir);
1456 rawdata->dents[AAFS_LOADDATA_DIR] = dir;
1458 dent = aafs_create_file("abi", S_IFREG | 0444, dir, rawdata,
1459 &seq_rawdata_abi_fops);
1462 rawdata->dents[AAFS_LOADDATA_ABI] = dent;
1464 dent = aafs_create_file("revision", S_IFREG | 0444, dir, rawdata,
1465 &seq_rawdata_revision_fops);
1468 rawdata->dents[AAFS_LOADDATA_REVISION] = dent;
1470 if (aa_g_hash_policy) {
1471 dent = aafs_create_file("sha1", S_IFREG | 0444, dir,
1472 rawdata, &seq_rawdata_hash_fops);
1475 rawdata->dents[AAFS_LOADDATA_HASH] = dent;
1478 dent = aafs_create_file("compressed_size", S_IFREG | 0444, dir,
1480 &seq_rawdata_compressed_size_fops);
1483 rawdata->dents[AAFS_LOADDATA_COMPRESSED_SIZE] = dent;
1485 dent = aafs_create_file("raw_data", S_IFREG | 0444,
1486 dir, rawdata, &rawdata_fops);
1489 rawdata->dents[AAFS_LOADDATA_DATA] = dent;
1490 d_inode(dent)->i_size = rawdata->size;
1492 rawdata->ns = aa_get_ns(ns);
1493 list_add(&rawdata->list, &ns->rawdata_list);
1494 /* no refcount on inode rawdata */
1499 remove_rawdata_dents(rawdata);
1501 return PTR_ERR(dent);
1503 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1506 /** fns to setup dynamic per profile/namespace files **/
1510 * Requires: @profile->ns->lock held
1512 void __aafs_profile_rmdir(struct aa_profile *profile)
1514 struct aa_profile *child;
1520 list_for_each_entry(child, &profile->base.profiles, base.list)
1521 __aafs_profile_rmdir(child);
1523 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
1524 struct aa_proxy *proxy;
1525 if (!profile->dents[i])
1528 proxy = d_inode(profile->dents[i])->i_private;
1529 aafs_remove(profile->dents[i]);
1530 aa_put_proxy(proxy);
1531 profile->dents[i] = NULL;
1537 * Requires: @old->ns->lock held
1539 void __aafs_profile_migrate_dents(struct aa_profile *old,
1540 struct aa_profile *new)
1546 AA_BUG(!mutex_is_locked(&profiles_ns(old)->lock));
1548 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
1549 new->dents[i] = old->dents[i];
1551 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
1552 old->dents[i] = NULL;
1556 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
1557 struct aa_profile *profile,
1558 const struct file_operations *fops)
1560 struct aa_proxy *proxy = aa_get_proxy(profile->label.proxy);
1561 struct dentry *dent;
1563 dent = aafs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
1565 aa_put_proxy(proxy);
1570 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1571 static int profile_depth(struct aa_profile *profile)
1576 for (depth = 0; profile; profile = rcu_access_pointer(profile->parent))
1583 static char *gen_symlink_name(int depth, const char *dirname, const char *fname)
1587 int size = depth * 6 + strlen(dirname) + strlen(fname) + 11;
1589 s = buffer = kmalloc(size, GFP_KERNEL);
1591 return ERR_PTR(-ENOMEM);
1593 for (; depth > 0; depth--) {
1594 strcpy(s, "../../");
1599 error = snprintf(s, size, "raw_data/%s/%s", dirname, fname);
1600 if (error >= size || error < 0) {
1602 return ERR_PTR(-ENAMETOOLONG);
1608 static void rawdata_link_cb(void *arg)
1613 static const char *rawdata_get_link_base(struct dentry *dentry,
1614 struct inode *inode,
1615 struct delayed_call *done,
1618 struct aa_proxy *proxy = inode->i_private;
1619 struct aa_label *label;
1620 struct aa_profile *profile;
1625 return ERR_PTR(-ECHILD);
1627 label = aa_get_label_rcu(&proxy->label);
1628 profile = labels_profile(label);
1629 depth = profile_depth(profile);
1630 target = gen_symlink_name(depth, profile->rawdata->name, name);
1631 aa_put_label(label);
1636 set_delayed_call(done, rawdata_link_cb, target);
1641 static const char *rawdata_get_link_sha1(struct dentry *dentry,
1642 struct inode *inode,
1643 struct delayed_call *done)
1645 return rawdata_get_link_base(dentry, inode, done, "sha1");
1648 static const char *rawdata_get_link_abi(struct dentry *dentry,
1649 struct inode *inode,
1650 struct delayed_call *done)
1652 return rawdata_get_link_base(dentry, inode, done, "abi");
1655 static const char *rawdata_get_link_data(struct dentry *dentry,
1656 struct inode *inode,
1657 struct delayed_call *done)
1659 return rawdata_get_link_base(dentry, inode, done, "raw_data");
1662 static const struct inode_operations rawdata_link_sha1_iops = {
1663 .get_link = rawdata_get_link_sha1,
1666 static const struct inode_operations rawdata_link_abi_iops = {
1667 .get_link = rawdata_get_link_abi,
1669 static const struct inode_operations rawdata_link_data_iops = {
1670 .get_link = rawdata_get_link_data,
1672 #endif /* CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1675 * Requires: @profile->ns->lock held
1677 int __aafs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
1679 struct aa_profile *child;
1680 struct dentry *dent = NULL, *dir;
1684 AA_BUG(!mutex_is_locked(&profiles_ns(profile)->lock));
1687 struct aa_profile *p;
1688 p = aa_deref_parent(profile);
1690 /* adding to parent that previously didn't have children */
1691 dent = aafs_create_dir("profiles", dent);
1694 prof_child_dir(p) = parent = dent;
1697 if (!profile->dirname) {
1699 len = mangle_name(profile->base.name, NULL);
1700 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
1702 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
1703 if (!profile->dirname) {
1708 mangle_name(profile->base.name, profile->dirname);
1709 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
1712 dent = aafs_create_dir(profile->dirname, parent);
1715 prof_dir(profile) = dir = dent;
1717 dent = create_profile_file(dir, "name", profile,
1718 &seq_profile_name_fops);
1721 profile->dents[AAFS_PROF_NAME] = dent;
1723 dent = create_profile_file(dir, "mode", profile,
1724 &seq_profile_mode_fops);
1727 profile->dents[AAFS_PROF_MODE] = dent;
1729 dent = create_profile_file(dir, "attach", profile,
1730 &seq_profile_attach_fops);
1733 profile->dents[AAFS_PROF_ATTACH] = dent;
1735 if (profile->hash) {
1736 dent = create_profile_file(dir, "sha1", profile,
1737 &seq_profile_hash_fops);
1740 profile->dents[AAFS_PROF_HASH] = dent;
1743 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1744 if (profile->rawdata) {
1745 if (aa_g_hash_policy) {
1746 dent = aafs_create("raw_sha1", S_IFLNK | 0444, dir,
1747 profile->label.proxy, NULL, NULL,
1748 &rawdata_link_sha1_iops);
1751 aa_get_proxy(profile->label.proxy);
1752 profile->dents[AAFS_PROF_RAW_HASH] = dent;
1754 dent = aafs_create("raw_abi", S_IFLNK | 0444, dir,
1755 profile->label.proxy, NULL, NULL,
1756 &rawdata_link_abi_iops);
1759 aa_get_proxy(profile->label.proxy);
1760 profile->dents[AAFS_PROF_RAW_ABI] = dent;
1762 dent = aafs_create("raw_data", S_IFLNK | 0444, dir,
1763 profile->label.proxy, NULL, NULL,
1764 &rawdata_link_data_iops);
1767 aa_get_proxy(profile->label.proxy);
1768 profile->dents[AAFS_PROF_RAW_DATA] = dent;
1770 #endif /*CONFIG_SECURITY_APPARMOR_EXPORT_BINARY */
1772 list_for_each_entry(child, &profile->base.profiles, base.list) {
1773 error = __aafs_profile_mkdir(child, prof_child_dir(profile));
1781 error = PTR_ERR(dent);
1784 __aafs_profile_rmdir(profile);
1789 static int ns_mkdir_op(struct user_namespace *mnt_userns, struct inode *dir,
1790 struct dentry *dentry, umode_t mode)
1792 struct aa_ns *ns, *parent;
1793 /* TODO: improve permission check */
1794 struct aa_label *label;
1797 label = begin_current_label_crit_section();
1798 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1799 end_current_label_crit_section(label);
1803 parent = aa_get_ns(dir->i_private);
1804 AA_BUG(d_inode(ns_subns_dir(parent)) != dir);
1806 /* we have to unlock and then relock to get locking order right
1810 error = simple_pin_fs(&aafs_ops, &aafs_mnt, &aafs_count);
1811 mutex_lock_nested(&parent->lock, parent->level);
1812 inode_lock_nested(dir, I_MUTEX_PARENT);
1816 error = __aafs_setup_d_inode(dir, dentry, mode | S_IFDIR, NULL,
1821 ns = __aa_find_or_create_ns(parent, READ_ONCE(dentry->d_name.name),
1824 error = PTR_ERR(ns);
1828 aa_put_ns(ns); /* list ref remains */
1831 simple_release_fs(&aafs_mnt, &aafs_count);
1833 mutex_unlock(&parent->lock);
1839 static int ns_rmdir_op(struct inode *dir, struct dentry *dentry)
1841 struct aa_ns *ns, *parent;
1842 /* TODO: improve permission check */
1843 struct aa_label *label;
1846 label = begin_current_label_crit_section();
1847 error = aa_may_manage_policy(label, NULL, AA_MAY_LOAD_POLICY);
1848 end_current_label_crit_section(label);
1852 parent = aa_get_ns(dir->i_private);
1853 /* rmdir calls the generic securityfs functions to remove files
1854 * from the apparmor dir. It is up to the apparmor ns locking
1858 inode_unlock(dentry->d_inode);
1860 mutex_lock_nested(&parent->lock, parent->level);
1861 ns = aa_get_ns(__aa_findn_ns(&parent->sub_ns, dentry->d_name.name,
1862 dentry->d_name.len));
1867 AA_BUG(ns_dir(ns) != dentry);
1873 mutex_unlock(&parent->lock);
1874 inode_lock_nested(dir, I_MUTEX_PARENT);
1875 inode_lock(dentry->d_inode);
1881 static const struct inode_operations ns_dir_inode_operations = {
1882 .lookup = simple_lookup,
1883 .mkdir = ns_mkdir_op,
1884 .rmdir = ns_rmdir_op,
1887 static void __aa_fs_list_remove_rawdata(struct aa_ns *ns)
1889 struct aa_loaddata *ent, *tmp;
1891 AA_BUG(!mutex_is_locked(&ns->lock));
1893 list_for_each_entry_safe(ent, tmp, &ns->rawdata_list, list)
1894 __aa_fs_remove_rawdata(ent);
1899 * Requires: @ns->lock held
1901 void __aafs_ns_rmdir(struct aa_ns *ns)
1904 struct aa_profile *child;
1909 AA_BUG(!mutex_is_locked(&ns->lock));
1911 list_for_each_entry(child, &ns->base.profiles, base.list)
1912 __aafs_profile_rmdir(child);
1914 list_for_each_entry(sub, &ns->sub_ns, base.list) {
1915 mutex_lock_nested(&sub->lock, sub->level);
1916 __aafs_ns_rmdir(sub);
1917 mutex_unlock(&sub->lock);
1920 __aa_fs_list_remove_rawdata(ns);
1922 if (ns_subns_dir(ns)) {
1923 sub = d_inode(ns_subns_dir(ns))->i_private;
1926 if (ns_subload(ns)) {
1927 sub = d_inode(ns_subload(ns))->i_private;
1930 if (ns_subreplace(ns)) {
1931 sub = d_inode(ns_subreplace(ns))->i_private;
1934 if (ns_subremove(ns)) {
1935 sub = d_inode(ns_subremove(ns))->i_private;
1938 if (ns_subrevision(ns)) {
1939 sub = d_inode(ns_subrevision(ns))->i_private;
1943 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
1944 aafs_remove(ns->dents[i]);
1945 ns->dents[i] = NULL;
1949 /* assumes cleanup in caller */
1950 static int __aafs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
1952 struct dentry *dent;
1957 dent = aafs_create_dir("profiles", dir);
1959 return PTR_ERR(dent);
1960 ns_subprofs_dir(ns) = dent;
1962 dent = aafs_create_dir("raw_data", dir);
1964 return PTR_ERR(dent);
1965 ns_subdata_dir(ns) = dent;
1967 dent = aafs_create_file("revision", 0444, dir, ns,
1968 &aa_fs_ns_revision_fops);
1970 return PTR_ERR(dent);
1972 ns_subrevision(ns) = dent;
1974 dent = aafs_create_file(".load", 0640, dir, ns,
1975 &aa_fs_profile_load);
1977 return PTR_ERR(dent);
1979 ns_subload(ns) = dent;
1981 dent = aafs_create_file(".replace", 0640, dir, ns,
1982 &aa_fs_profile_replace);
1984 return PTR_ERR(dent);
1986 ns_subreplace(ns) = dent;
1988 dent = aafs_create_file(".remove", 0640, dir, ns,
1989 &aa_fs_profile_remove);
1991 return PTR_ERR(dent);
1993 ns_subremove(ns) = dent;
1995 /* use create_dentry so we can supply private data */
1996 dent = aafs_create("namespaces", S_IFDIR | 0755, dir, ns, NULL, NULL,
1997 &ns_dir_inode_operations);
1999 return PTR_ERR(dent);
2001 ns_subns_dir(ns) = dent;
2007 * Requires: @ns->lock held
2009 int __aafs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name,
2010 struct dentry *dent)
2013 struct aa_profile *child;
2019 AA_BUG(!mutex_is_locked(&ns->lock));
2022 name = ns->base.name;
2025 /* create ns dir if it doesn't already exist */
2026 dent = aafs_create_dir(name, parent);
2031 ns_dir(ns) = dir = dent;
2032 error = __aafs_ns_mkdir_entries(ns, dir);
2037 list_for_each_entry(child, &ns->base.profiles, base.list) {
2038 error = __aafs_profile_mkdir(child, ns_subprofs_dir(ns));
2044 list_for_each_entry(sub, &ns->sub_ns, base.list) {
2045 mutex_lock_nested(&sub->lock, sub->level);
2046 error = __aafs_ns_mkdir(sub, ns_subns_dir(ns), NULL, NULL);
2047 mutex_unlock(&sub->lock);
2055 error = PTR_ERR(dent);
2058 __aafs_ns_rmdir(ns);
2064 * __next_ns - find the next namespace to list
2065 * @root: root namespace to stop search at (NOT NULL)
2066 * @ns: current ns position (NOT NULL)
2068 * Find the next namespace from @ns under @root and handle all locking needed
2069 * while switching current namespace.
2071 * Returns: next namespace or NULL if at last namespace under @root
2072 * Requires: ns->parent->lock to be held
2073 * NOTE: will not unlock root->lock
2075 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
2077 struct aa_ns *parent, *next;
2081 AA_BUG(ns != root && !mutex_is_locked(&ns->parent->lock));
2083 /* is next namespace a child */
2084 if (!list_empty(&ns->sub_ns)) {
2085 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
2086 mutex_lock_nested(&next->lock, next->level);
2090 /* check if the next ns is a sibling, parent, gp, .. */
2091 parent = ns->parent;
2092 while (ns != root) {
2093 mutex_unlock(&ns->lock);
2094 next = list_next_entry(ns, base.list);
2095 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
2096 mutex_lock_nested(&next->lock, next->level);
2100 parent = parent->parent;
2107 * __first_profile - find the first profile in a namespace
2108 * @root: namespace that is root of profiles being displayed (NOT NULL)
2109 * @ns: namespace to start in (NOT NULL)
2111 * Returns: unrefcounted profile or NULL if no profile
2112 * Requires: profile->ns.lock to be held
2114 static struct aa_profile *__first_profile(struct aa_ns *root,
2118 AA_BUG(ns && !mutex_is_locked(&ns->lock));
2120 for (; ns; ns = __next_ns(root, ns)) {
2121 if (!list_empty(&ns->base.profiles))
2122 return list_first_entry(&ns->base.profiles,
2123 struct aa_profile, base.list);
2129 * __next_profile - step to the next profile in a profile tree
2130 * @p: current profile in tree (NOT NULL)
2132 * Perform a depth first traversal on the profile tree in a namespace
2134 * Returns: next profile or NULL if done
2135 * Requires: profile->ns.lock to be held
2137 static struct aa_profile *__next_profile(struct aa_profile *p)
2139 struct aa_profile *parent;
2140 struct aa_ns *ns = p->ns;
2142 AA_BUG(!mutex_is_locked(&profiles_ns(p)->lock));
2144 /* is next profile a child */
2145 if (!list_empty(&p->base.profiles))
2146 return list_first_entry(&p->base.profiles, typeof(*p),
2149 /* is next profile a sibling, parent sibling, gp, sibling, .. */
2150 parent = rcu_dereference_protected(p->parent,
2151 mutex_is_locked(&p->ns->lock));
2153 p = list_next_entry(p, base.list);
2154 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
2157 parent = rcu_dereference_protected(parent->parent,
2158 mutex_is_locked(&parent->ns->lock));
2161 /* is next another profile in the namespace */
2162 p = list_next_entry(p, base.list);
2163 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
2170 * next_profile - step to the next profile in where ever it may be
2171 * @root: root namespace (NOT NULL)
2172 * @profile: current profile (NOT NULL)
2174 * Returns: next profile or NULL if there isn't one
2176 static struct aa_profile *next_profile(struct aa_ns *root,
2177 struct aa_profile *profile)
2179 struct aa_profile *next = __next_profile(profile);
2183 /* finished all profiles in namespace move to next namespace */
2184 return __first_profile(root, __next_ns(root, profile->ns));
2188 * p_start - start a depth first traversal of profile tree
2189 * @f: seq_file to fill
2190 * @pos: current position
2192 * Returns: first profile under current namespace or NULL if none found
2194 * acquires first ns->lock
2196 static void *p_start(struct seq_file *f, loff_t *pos)
2198 struct aa_profile *profile = NULL;
2199 struct aa_ns *root = aa_get_current_ns();
2203 /* find the first profile */
2204 mutex_lock_nested(&root->lock, root->level);
2205 profile = __first_profile(root, root);
2207 /* skip to position */
2208 for (; profile && l > 0; l--)
2209 profile = next_profile(root, profile);
2215 * p_next - read the next profile entry
2216 * @f: seq_file to fill
2217 * @p: profile previously returned
2218 * @pos: current position
2220 * Returns: next profile after @p or NULL if none
2222 * may acquire/release locks in namespace tree as necessary
2224 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
2226 struct aa_profile *profile = p;
2227 struct aa_ns *ns = f->private;
2230 return next_profile(ns, profile);
2234 * p_stop - stop depth first traversal
2235 * @f: seq_file we are filling
2236 * @p: the last profile writen
2238 * Release all locking done by p_start/p_next on namespace tree
2240 static void p_stop(struct seq_file *f, void *p)
2242 struct aa_profile *profile = p;
2243 struct aa_ns *root = f->private, *ns;
2246 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
2247 mutex_unlock(&ns->lock);
2249 mutex_unlock(&root->lock);
2254 * seq_show_profile - show a profile entry
2255 * @f: seq_file to file
2256 * @p: current position (profile) (NOT NULL)
2258 * Returns: error on failure
2260 static int seq_show_profile(struct seq_file *f, void *p)
2262 struct aa_profile *profile = (struct aa_profile *)p;
2263 struct aa_ns *root = f->private;
2265 aa_label_seq_xprint(f, root, &profile->label,
2266 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS, GFP_KERNEL);
2272 static const struct seq_operations aa_sfs_profiles_op = {
2276 .show = seq_show_profile,
2279 static int profiles_open(struct inode *inode, struct file *file)
2281 if (!aa_current_policy_view_capable(NULL))
2284 return seq_open(file, &aa_sfs_profiles_op);
2287 static int profiles_release(struct inode *inode, struct file *file)
2289 return seq_release(inode, file);
2292 static const struct file_operations aa_sfs_profiles_fops = {
2293 .open = profiles_open,
2295 .llseek = seq_lseek,
2296 .release = profiles_release,
2300 /** Base file system setup **/
2301 static struct aa_sfs_entry aa_sfs_entry_file[] = {
2302 AA_SFS_FILE_STRING("mask",
2303 "create read write exec append mmap_exec link lock"),
2307 static struct aa_sfs_entry aa_sfs_entry_ptrace[] = {
2308 AA_SFS_FILE_STRING("mask", "read trace"),
2312 static struct aa_sfs_entry aa_sfs_entry_signal[] = {
2313 AA_SFS_FILE_STRING("mask", AA_SFS_SIG_MASK),
2317 static struct aa_sfs_entry aa_sfs_entry_attach[] = {
2318 AA_SFS_FILE_BOOLEAN("xattr", 1),
2321 static struct aa_sfs_entry aa_sfs_entry_domain[] = {
2322 AA_SFS_FILE_BOOLEAN("change_hat", 1),
2323 AA_SFS_FILE_BOOLEAN("change_hatv", 1),
2324 AA_SFS_FILE_BOOLEAN("change_onexec", 1),
2325 AA_SFS_FILE_BOOLEAN("change_profile", 1),
2326 AA_SFS_FILE_BOOLEAN("stack", 1),
2327 AA_SFS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
2328 AA_SFS_FILE_BOOLEAN("post_nnp_subset", 1),
2329 AA_SFS_FILE_BOOLEAN("computed_longest_left", 1),
2330 AA_SFS_DIR("attach_conditions", aa_sfs_entry_attach),
2331 AA_SFS_FILE_STRING("version", "1.2"),
2335 static struct aa_sfs_entry aa_sfs_entry_versions[] = {
2336 AA_SFS_FILE_BOOLEAN("v5", 1),
2337 AA_SFS_FILE_BOOLEAN("v6", 1),
2338 AA_SFS_FILE_BOOLEAN("v7", 1),
2339 AA_SFS_FILE_BOOLEAN("v8", 1),
2340 AA_SFS_FILE_BOOLEAN("v9", 1),
2344 static struct aa_sfs_entry aa_sfs_entry_policy[] = {
2345 AA_SFS_DIR("versions", aa_sfs_entry_versions),
2346 AA_SFS_FILE_BOOLEAN("set_load", 1),
2347 /* number of out of band transitions supported */
2348 AA_SFS_FILE_U64("outofband", MAX_OOB_SUPPORTED),
2352 static struct aa_sfs_entry aa_sfs_entry_mount[] = {
2353 AA_SFS_FILE_STRING("mask", "mount umount pivot_root"),
2357 static struct aa_sfs_entry aa_sfs_entry_ns[] = {
2358 AA_SFS_FILE_BOOLEAN("profile", 1),
2359 AA_SFS_FILE_BOOLEAN("pivot_root", 0),
2363 static struct aa_sfs_entry aa_sfs_entry_query_label[] = {
2364 AA_SFS_FILE_STRING("perms", "allow deny audit quiet"),
2365 AA_SFS_FILE_BOOLEAN("data", 1),
2366 AA_SFS_FILE_BOOLEAN("multi_transaction", 1),
2370 static struct aa_sfs_entry aa_sfs_entry_query[] = {
2371 AA_SFS_DIR("label", aa_sfs_entry_query_label),
2374 static struct aa_sfs_entry aa_sfs_entry_features[] = {
2375 AA_SFS_DIR("policy", aa_sfs_entry_policy),
2376 AA_SFS_DIR("domain", aa_sfs_entry_domain),
2377 AA_SFS_DIR("file", aa_sfs_entry_file),
2378 AA_SFS_DIR("network_v8", aa_sfs_entry_network),
2379 AA_SFS_DIR("mount", aa_sfs_entry_mount),
2380 AA_SFS_DIR("namespaces", aa_sfs_entry_ns),
2381 AA_SFS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
2382 AA_SFS_DIR("rlimit", aa_sfs_entry_rlimit),
2383 AA_SFS_DIR("caps", aa_sfs_entry_caps),
2384 AA_SFS_DIR("ptrace", aa_sfs_entry_ptrace),
2385 AA_SFS_DIR("signal", aa_sfs_entry_signal),
2386 AA_SFS_DIR("query", aa_sfs_entry_query),
2390 static struct aa_sfs_entry aa_sfs_entry_apparmor[] = {
2391 AA_SFS_FILE_FOPS(".access", 0666, &aa_sfs_access),
2392 AA_SFS_FILE_FOPS(".stacked", 0444, &seq_ns_stacked_fops),
2393 AA_SFS_FILE_FOPS(".ns_stacked", 0444, &seq_ns_nsstacked_fops),
2394 AA_SFS_FILE_FOPS(".ns_level", 0444, &seq_ns_level_fops),
2395 AA_SFS_FILE_FOPS(".ns_name", 0444, &seq_ns_name_fops),
2396 AA_SFS_FILE_FOPS("profiles", 0444, &aa_sfs_profiles_fops),
2397 AA_SFS_DIR("features", aa_sfs_entry_features),
2401 static struct aa_sfs_entry aa_sfs_entry =
2402 AA_SFS_DIR("apparmor", aa_sfs_entry_apparmor);
2405 * entry_create_file - create a file entry in the apparmor securityfs
2406 * @fs_file: aa_sfs_entry to build an entry for (NOT NULL)
2407 * @parent: the parent dentry in the securityfs
2409 * Use entry_remove_file to remove entries created with this fn.
2411 static int __init entry_create_file(struct aa_sfs_entry *fs_file,
2412 struct dentry *parent)
2416 fs_file->dentry = securityfs_create_file(fs_file->name,
2417 S_IFREG | fs_file->mode,
2420 if (IS_ERR(fs_file->dentry)) {
2421 error = PTR_ERR(fs_file->dentry);
2422 fs_file->dentry = NULL;
2427 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir);
2429 * entry_create_dir - recursively create a directory entry in the securityfs
2430 * @fs_dir: aa_sfs_entry (and all child entries) to build (NOT NULL)
2431 * @parent: the parent dentry in the securityfs
2433 * Use entry_remove_dir to remove entries created with this fn.
2435 static int __init entry_create_dir(struct aa_sfs_entry *fs_dir,
2436 struct dentry *parent)
2438 struct aa_sfs_entry *fs_file;
2442 dir = securityfs_create_dir(fs_dir->name, parent);
2444 return PTR_ERR(dir);
2445 fs_dir->dentry = dir;
2447 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2448 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2449 error = entry_create_dir(fs_file, fs_dir->dentry);
2451 error = entry_create_file(fs_file, fs_dir->dentry);
2459 entry_remove_dir(fs_dir);
2465 * entry_remove_file - drop a single file entry in the apparmor securityfs
2466 * @fs_file: aa_sfs_entry to detach from the securityfs (NOT NULL)
2468 static void __init entry_remove_file(struct aa_sfs_entry *fs_file)
2470 if (!fs_file->dentry)
2473 securityfs_remove(fs_file->dentry);
2474 fs_file->dentry = NULL;
2478 * entry_remove_dir - recursively drop a directory entry from the securityfs
2479 * @fs_dir: aa_sfs_entry (and all child entries) to detach (NOT NULL)
2481 static void __init entry_remove_dir(struct aa_sfs_entry *fs_dir)
2483 struct aa_sfs_entry *fs_file;
2485 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
2486 if (fs_file->v_type == AA_SFS_TYPE_DIR)
2487 entry_remove_dir(fs_file);
2489 entry_remove_file(fs_file);
2492 entry_remove_file(fs_dir);
2496 * aa_destroy_aafs - cleanup and free aafs
2498 * releases dentries allocated by aa_create_aafs
2500 void __init aa_destroy_aafs(void)
2502 entry_remove_dir(&aa_sfs_entry);
2506 #define NULL_FILE_NAME ".null"
2507 struct path aa_null;
2509 static int aa_mk_null_file(struct dentry *parent)
2511 struct vfsmount *mount = NULL;
2512 struct dentry *dentry;
2513 struct inode *inode;
2515 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
2520 inode_lock(d_inode(parent));
2521 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
2522 if (IS_ERR(dentry)) {
2523 error = PTR_ERR(dentry);
2526 inode = new_inode(parent->d_inode->i_sb);
2532 inode->i_ino = get_next_ino();
2533 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
2534 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
2535 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
2536 MKDEV(MEM_MAJOR, 3));
2537 d_instantiate(dentry, inode);
2538 aa_null.dentry = dget(dentry);
2539 aa_null.mnt = mntget(mount);
2546 inode_unlock(d_inode(parent));
2547 simple_release_fs(&mount, &count);
2553 static const char *policy_get_link(struct dentry *dentry,
2554 struct inode *inode,
2555 struct delayed_call *done)
2562 return ERR_PTR(-ECHILD);
2564 ns = aa_get_current_ns();
2565 path.mnt = mntget(aafs_mnt);
2566 path.dentry = dget(ns_dir(ns));
2567 error = nd_jump_link(&path);
2570 return ERR_PTR(error);
2573 static int policy_readlink(struct dentry *dentry, char __user *buffer,
2579 res = snprintf(name, sizeof(name), "%s:[%lu]", AAFS_NAME,
2580 d_inode(dentry)->i_ino);
2581 if (res > 0 && res < sizeof(name))
2582 res = readlink_copy(buffer, buflen, name);
2589 static const struct inode_operations policy_link_iops = {
2590 .readlink = policy_readlink,
2591 .get_link = policy_get_link,
2596 * aa_create_aafs - create the apparmor security filesystem
2598 * dentries created here are released by aa_destroy_aafs
2600 * Returns: error on failure
2602 static int __init aa_create_aafs(void)
2604 struct dentry *dent;
2607 if (!apparmor_initialized)
2610 if (aa_sfs_entry.dentry) {
2611 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
2615 /* setup apparmorfs used to virtualize policy/ */
2616 aafs_mnt = kern_mount(&aafs_ops);
2617 if (IS_ERR(aafs_mnt))
2618 panic("can't set apparmorfs up\n");
2619 aafs_mnt->mnt_sb->s_flags &= ~SB_NOUSER;
2621 /* Populate fs tree. */
2622 error = entry_create_dir(&aa_sfs_entry, NULL);
2626 dent = securityfs_create_file(".load", 0666, aa_sfs_entry.dentry,
2627 NULL, &aa_fs_profile_load);
2630 ns_subload(root_ns) = dent;
2632 dent = securityfs_create_file(".replace", 0666, aa_sfs_entry.dentry,
2633 NULL, &aa_fs_profile_replace);
2636 ns_subreplace(root_ns) = dent;
2638 dent = securityfs_create_file(".remove", 0666, aa_sfs_entry.dentry,
2639 NULL, &aa_fs_profile_remove);
2642 ns_subremove(root_ns) = dent;
2644 dent = securityfs_create_file("revision", 0444, aa_sfs_entry.dentry,
2645 NULL, &aa_fs_ns_revision_fops);
2648 ns_subrevision(root_ns) = dent;
2650 /* policy tree referenced by magic policy symlink */
2651 mutex_lock_nested(&root_ns->lock, root_ns->level);
2652 error = __aafs_ns_mkdir(root_ns, aafs_mnt->mnt_root, ".policy",
2653 aafs_mnt->mnt_root);
2654 mutex_unlock(&root_ns->lock);
2658 /* magic symlink similar to nsfs redirects based on task policy */
2659 dent = securityfs_create_symlink("policy", aa_sfs_entry.dentry,
2660 NULL, &policy_link_iops);
2664 error = aa_mk_null_file(aa_sfs_entry.dentry);
2668 /* TODO: add default profile to apparmorfs */
2670 /* Report that AppArmor fs is enabled */
2671 aa_info_message("AppArmor Filesystem Enabled");
2675 error = PTR_ERR(dent);
2678 AA_ERROR("Error creating AppArmor securityfs\n");
2682 fs_initcall(aa_create_aafs);