2 * AppArmor security module
4 * This file contains AppArmor /sys/kernel/security/apparmor interface functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
15 #include <linux/ctype.h>
16 #include <linux/security.h>
17 #include <linux/vmalloc.h>
18 #include <linux/module.h>
19 #include <linux/seq_file.h>
20 #include <linux/uaccess.h>
21 #include <linux/mount.h>
22 #include <linux/namei.h>
23 #include <linux/capability.h>
24 #include <linux/rcupdate.h>
25 #include <uapi/linux/major.h>
28 #include "include/apparmor.h"
29 #include "include/apparmorfs.h"
30 #include "include/audit.h"
31 #include "include/context.h"
32 #include "include/crypto.h"
33 #include "include/policy.h"
34 #include "include/policy_ns.h"
35 #include "include/resource.h"
36 #include "include/policy_unpack.h"
39 * aa_mangle_name - mangle a profile name to std profile layout form
40 * @name: profile name to mangle (NOT NULL)
41 * @target: buffer to store mangled name, same length as @name (MAYBE NULL)
43 * Returns: length of mangled name
45 static int mangle_name(const char *name, char *target)
49 while (*name == '/' || *name == '.')
53 for (; *name; name++) {
56 else if (isspace(*name))
58 else if (isalnum(*name) || strchr("._-", *name))
65 for (; *name; name++) {
66 if (isalnum(*name) || isspace(*name) ||
67 strchr("/._-", *name))
78 * aa_simple_write_to_buffer - common routine for getting policy from user
79 * @userbuf: user buffer to copy data from (NOT NULL)
80 * @alloc_size: size of user buffer (REQUIRES: @alloc_size >= @copy_size)
81 * @copy_size: size of data to copy from user buffer
82 * @pos: position write is at in the file (NOT NULL)
84 * Returns: kernel buffer containing copy of user buffer data or an
87 static struct aa_loaddata *aa_simple_write_to_buffer(const char __user *userbuf,
92 struct aa_loaddata *data;
94 BUG_ON(copy_size > alloc_size);
97 /* only writes from pos 0, that is complete writes */
98 return ERR_PTR(-ESPIPE);
100 /* freed by caller to simple_write_to_buffer */
101 data = kvmalloc(sizeof(*data) + alloc_size);
103 return ERR_PTR(-ENOMEM);
104 kref_init(&data->count);
105 data->size = copy_size;
109 if (copy_from_user(data->data, userbuf, copy_size)) {
111 return ERR_PTR(-EFAULT);
117 static ssize_t policy_update(int binop, const char __user *buf, size_t size,
118 loff_t *pos, struct aa_ns *ns)
121 struct aa_loaddata *data;
122 struct aa_profile *profile = aa_current_profile();
123 const char *op = binop == PROF_ADD ? OP_PROF_LOAD : OP_PROF_REPL;
124 /* high level check about policy management - fine grained in
127 error = aa_may_manage_policy(profile, ns, op);
131 data = aa_simple_write_to_buffer(buf, size, size, pos);
132 error = PTR_ERR(data);
134 error = aa_replace_profiles(ns ? ns : profile->ns, profile,
136 aa_put_loaddata(data);
142 /* .load file hook fn to load policy */
143 static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
146 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
147 int error = policy_update(PROF_ADD, buf, size, pos, ns);
154 static const struct file_operations aa_fs_profile_load = {
155 .write = profile_load,
156 .llseek = default_llseek,
159 /* .replace file hook fn to load and/or replace policy */
160 static ssize_t profile_replace(struct file *f, const char __user *buf,
161 size_t size, loff_t *pos)
163 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
164 int error = policy_update(PROF_REPLACE, buf, size, pos, ns);
171 static const struct file_operations aa_fs_profile_replace = {
172 .write = profile_replace,
173 .llseek = default_llseek,
176 /* .remove file hook fn to remove loaded policy */
177 static ssize_t profile_remove(struct file *f, const char __user *buf,
178 size_t size, loff_t *pos)
180 struct aa_loaddata *data;
181 struct aa_profile *profile;
183 struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
185 profile = aa_current_profile();
186 /* high level check about policy management - fine grained in
189 error = aa_may_manage_policy(profile, ns, OP_PROF_RM);
194 * aa_remove_profile needs a null terminated string so 1 extra
195 * byte is allocated and the copied data is null terminated.
197 data = aa_simple_write_to_buffer(buf, size + 1, size, pos);
199 error = PTR_ERR(data);
201 data->data[size] = 0;
202 error = aa_remove_profiles(ns ? ns : profile->ns, profile,
204 aa_put_loaddata(data);
211 static const struct file_operations aa_fs_profile_remove = {
212 .write = profile_remove,
213 .llseek = default_llseek,
216 static int aa_fs_seq_show(struct seq_file *seq, void *v)
218 struct aa_fs_entry *fs_file = seq->private;
223 switch (fs_file->v_type) {
224 case AA_FS_TYPE_BOOLEAN:
225 seq_printf(seq, "%s\n", fs_file->v.boolean ? "yes" : "no");
227 case AA_FS_TYPE_STRING:
228 seq_printf(seq, "%s\n", fs_file->v.string);
231 seq_printf(seq, "%#08lx\n", fs_file->v.u64);
234 /* Ignore unpritable entry types. */
241 static int aa_fs_seq_open(struct inode *inode, struct file *file)
243 return single_open(file, aa_fs_seq_show, inode->i_private);
246 const struct file_operations aa_fs_seq_file_ops = {
247 .owner = THIS_MODULE,
248 .open = aa_fs_seq_open,
251 .release = single_release,
254 static int aa_fs_seq_profile_open(struct inode *inode, struct file *file,
255 int (*show)(struct seq_file *, void *))
257 struct aa_proxy *proxy = aa_get_proxy(inode->i_private);
258 int error = single_open(file, show, proxy);
261 file->private_data = NULL;
268 static int aa_fs_seq_profile_release(struct inode *inode, struct file *file)
270 struct seq_file *seq = (struct seq_file *) file->private_data;
272 aa_put_proxy(seq->private);
273 return single_release(inode, file);
276 static int aa_fs_seq_profname_show(struct seq_file *seq, void *v)
278 struct aa_proxy *proxy = seq->private;
279 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
280 seq_printf(seq, "%s\n", profile->base.name);
281 aa_put_profile(profile);
286 static int aa_fs_seq_profname_open(struct inode *inode, struct file *file)
288 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profname_show);
291 static const struct file_operations aa_fs_profname_fops = {
292 .owner = THIS_MODULE,
293 .open = aa_fs_seq_profname_open,
296 .release = aa_fs_seq_profile_release,
299 static int aa_fs_seq_profmode_show(struct seq_file *seq, void *v)
301 struct aa_proxy *proxy = seq->private;
302 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
303 seq_printf(seq, "%s\n", aa_profile_mode_names[profile->mode]);
304 aa_put_profile(profile);
309 static int aa_fs_seq_profmode_open(struct inode *inode, struct file *file)
311 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profmode_show);
314 static const struct file_operations aa_fs_profmode_fops = {
315 .owner = THIS_MODULE,
316 .open = aa_fs_seq_profmode_open,
319 .release = aa_fs_seq_profile_release,
322 static int aa_fs_seq_profattach_show(struct seq_file *seq, void *v)
324 struct aa_proxy *proxy = seq->private;
325 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
327 seq_printf(seq, "%s\n", profile->attach);
328 else if (profile->xmatch)
329 seq_puts(seq, "<unknown>\n");
331 seq_printf(seq, "%s\n", profile->base.name);
332 aa_put_profile(profile);
337 static int aa_fs_seq_profattach_open(struct inode *inode, struct file *file)
339 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_profattach_show);
342 static const struct file_operations aa_fs_profattach_fops = {
343 .owner = THIS_MODULE,
344 .open = aa_fs_seq_profattach_open,
347 .release = aa_fs_seq_profile_release,
350 static int aa_fs_seq_hash_show(struct seq_file *seq, void *v)
352 struct aa_proxy *proxy = seq->private;
353 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
354 unsigned int i, size = aa_hash_size();
357 for (i = 0; i < size; i++)
358 seq_printf(seq, "%.2x", profile->hash[i]);
361 aa_put_profile(profile);
366 static int aa_fs_seq_hash_open(struct inode *inode, struct file *file)
368 return single_open(file, aa_fs_seq_hash_show, inode->i_private);
371 static const struct file_operations aa_fs_seq_hash_fops = {
372 .owner = THIS_MODULE,
373 .open = aa_fs_seq_hash_open,
376 .release = single_release,
380 static int aa_fs_seq_show_ns_level(struct seq_file *seq, void *v)
382 struct aa_ns *ns = aa_current_profile()->ns;
384 seq_printf(seq, "%d\n", ns->level);
389 static int aa_fs_seq_open_ns_level(struct inode *inode, struct file *file)
391 return single_open(file, aa_fs_seq_show_ns_level, inode->i_private);
394 static const struct file_operations aa_fs_ns_level = {
395 .owner = THIS_MODULE,
396 .open = aa_fs_seq_open_ns_level,
399 .release = single_release,
402 static int aa_fs_seq_show_ns_name(struct seq_file *seq, void *v)
404 struct aa_ns *ns = aa_current_profile()->ns;
406 seq_printf(seq, "%s\n", ns->base.name);
411 static int aa_fs_seq_open_ns_name(struct inode *inode, struct file *file)
413 return single_open(file, aa_fs_seq_show_ns_name, inode->i_private);
416 static const struct file_operations aa_fs_ns_name = {
417 .owner = THIS_MODULE,
418 .open = aa_fs_seq_open_ns_name,
421 .release = single_release,
424 static int rawdata_release(struct inode *inode, struct file *file)
426 /* TODO: switch to loaddata when profile switched to symlink */
427 aa_put_loaddata(file->private_data);
432 static int aa_fs_seq_raw_abi_show(struct seq_file *seq, void *v)
434 struct aa_proxy *proxy = seq->private;
435 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
437 if (profile->rawdata->abi) {
438 seq_printf(seq, "v%d", profile->rawdata->abi);
441 aa_put_profile(profile);
446 static int aa_fs_seq_raw_abi_open(struct inode *inode, struct file *file)
448 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_abi_show);
451 static const struct file_operations aa_fs_seq_raw_abi_fops = {
452 .owner = THIS_MODULE,
453 .open = aa_fs_seq_raw_abi_open,
456 .release = aa_fs_seq_profile_release,
459 static int aa_fs_seq_raw_hash_show(struct seq_file *seq, void *v)
461 struct aa_proxy *proxy = seq->private;
462 struct aa_profile *profile = aa_get_profile_rcu(&proxy->profile);
463 unsigned int i, size = aa_hash_size();
465 if (profile->rawdata->hash) {
466 for (i = 0; i < size; i++)
467 seq_printf(seq, "%.2x", profile->rawdata->hash[i]);
470 aa_put_profile(profile);
475 static int aa_fs_seq_raw_hash_open(struct inode *inode, struct file *file)
477 return aa_fs_seq_profile_open(inode, file, aa_fs_seq_raw_hash_show);
480 static const struct file_operations aa_fs_seq_raw_hash_fops = {
481 .owner = THIS_MODULE,
482 .open = aa_fs_seq_raw_hash_open,
485 .release = aa_fs_seq_profile_release,
488 static ssize_t rawdata_read(struct file *file, char __user *buf, size_t size,
491 struct aa_loaddata *rawdata = file->private_data;
493 return simple_read_from_buffer(buf, size, ppos, rawdata->data,
497 static int rawdata_open(struct inode *inode, struct file *file)
499 struct aa_proxy *proxy = inode->i_private;
500 struct aa_profile *profile;
502 if (!policy_view_capable(NULL))
504 profile = aa_get_profile_rcu(&proxy->profile);
505 file->private_data = aa_get_loaddata(profile->rawdata);
506 aa_put_profile(profile);
511 static const struct file_operations aa_fs_rawdata_fops = {
512 .open = rawdata_open,
513 .read = rawdata_read,
514 .llseek = generic_file_llseek,
515 .release = rawdata_release,
518 /** fns to setup dynamic per profile/namespace files **/
519 void __aa_fs_profile_rmdir(struct aa_profile *profile)
521 struct aa_profile *child;
527 list_for_each_entry(child, &profile->base.profiles, base.list)
528 __aa_fs_profile_rmdir(child);
530 for (i = AAFS_PROF_SIZEOF - 1; i >= 0; --i) {
531 struct aa_proxy *proxy;
532 if (!profile->dents[i])
535 proxy = d_inode(profile->dents[i])->i_private;
536 securityfs_remove(profile->dents[i]);
538 profile->dents[i] = NULL;
542 void __aa_fs_profile_migrate_dents(struct aa_profile *old,
543 struct aa_profile *new)
547 for (i = 0; i < AAFS_PROF_SIZEOF; i++) {
548 new->dents[i] = old->dents[i];
550 new->dents[i]->d_inode->i_mtime = current_time(new->dents[i]->d_inode);
551 old->dents[i] = NULL;
555 static struct dentry *create_profile_file(struct dentry *dir, const char *name,
556 struct aa_profile *profile,
557 const struct file_operations *fops)
559 struct aa_proxy *proxy = aa_get_proxy(profile->proxy);
562 dent = securityfs_create_file(name, S_IFREG | 0444, dir, proxy, fops);
569 /* requires lock be held */
570 int __aa_fs_profile_mkdir(struct aa_profile *profile, struct dentry *parent)
572 struct aa_profile *child;
573 struct dentry *dent = NULL, *dir;
577 struct aa_profile *p;
578 p = aa_deref_parent(profile);
580 /* adding to parent that previously didn't have children */
581 dent = securityfs_create_dir("profiles", dent);
584 prof_child_dir(p) = parent = dent;
587 if (!profile->dirname) {
589 len = mangle_name(profile->base.name, NULL);
590 id_len = snprintf(NULL, 0, ".%ld", profile->ns->uniq_id);
592 profile->dirname = kmalloc(len + id_len + 1, GFP_KERNEL);
593 if (!profile->dirname)
596 mangle_name(profile->base.name, profile->dirname);
597 sprintf(profile->dirname + len, ".%ld", profile->ns->uniq_id++);
600 dent = securityfs_create_dir(profile->dirname, parent);
603 prof_dir(profile) = dir = dent;
605 dent = create_profile_file(dir, "name", profile, &aa_fs_profname_fops);
608 profile->dents[AAFS_PROF_NAME] = dent;
610 dent = create_profile_file(dir, "mode", profile, &aa_fs_profmode_fops);
613 profile->dents[AAFS_PROF_MODE] = dent;
615 dent = create_profile_file(dir, "attach", profile,
616 &aa_fs_profattach_fops);
619 profile->dents[AAFS_PROF_ATTACH] = dent;
622 dent = create_profile_file(dir, "sha1", profile,
623 &aa_fs_seq_hash_fops);
626 profile->dents[AAFS_PROF_HASH] = dent;
629 if (profile->rawdata) {
630 dent = create_profile_file(dir, "raw_sha1", profile,
631 &aa_fs_seq_raw_hash_fops);
634 profile->dents[AAFS_PROF_RAW_HASH] = dent;
636 dent = create_profile_file(dir, "raw_abi", profile,
637 &aa_fs_seq_raw_abi_fops);
640 profile->dents[AAFS_PROF_RAW_ABI] = dent;
642 dent = securityfs_create_file("raw_data", S_IFREG | 0444, dir,
644 &aa_fs_rawdata_fops);
647 profile->dents[AAFS_PROF_RAW_DATA] = dent;
648 d_inode(dent)->i_size = profile->rawdata->size;
649 aa_get_proxy(profile->proxy);
652 list_for_each_entry(child, &profile->base.profiles, base.list) {
653 error = __aa_fs_profile_mkdir(child, prof_child_dir(profile));
661 error = PTR_ERR(dent);
664 __aa_fs_profile_rmdir(profile);
669 void __aa_fs_ns_rmdir(struct aa_ns *ns)
672 struct aa_profile *child;
678 list_for_each_entry(child, &ns->base.profiles, base.list)
679 __aa_fs_profile_rmdir(child);
681 list_for_each_entry(sub, &ns->sub_ns, base.list) {
682 mutex_lock(&sub->lock);
683 __aa_fs_ns_rmdir(sub);
684 mutex_unlock(&sub->lock);
687 if (ns_subns_dir(ns)) {
688 sub = d_inode(ns_subns_dir(ns))->i_private;
691 if (ns_subload(ns)) {
692 sub = d_inode(ns_subload(ns))->i_private;
695 if (ns_subreplace(ns)) {
696 sub = d_inode(ns_subreplace(ns))->i_private;
699 if (ns_subremove(ns)) {
700 sub = d_inode(ns_subremove(ns))->i_private;
704 for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
705 securityfs_remove(ns->dents[i]);
710 /* assumes cleanup in caller */
711 static int __aa_fs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
718 dent = securityfs_create_dir("profiles", dir);
720 return PTR_ERR(dent);
721 ns_subprofs_dir(ns) = dent;
723 dent = securityfs_create_dir("raw_data", dir);
725 return PTR_ERR(dent);
726 ns_subdata_dir(ns) = dent;
728 dent = securityfs_create_file(".load", 0640, dir, ns,
729 &aa_fs_profile_load);
731 return PTR_ERR(dent);
733 ns_subload(ns) = dent;
735 dent = securityfs_create_file(".replace", 0640, dir, ns,
736 &aa_fs_profile_replace);
738 return PTR_ERR(dent);
740 ns_subreplace(ns) = dent;
742 dent = securityfs_create_file(".remove", 0640, dir, ns,
743 &aa_fs_profile_remove);
745 return PTR_ERR(dent);
747 ns_subremove(ns) = dent;
749 dent = securityfs_create_dir("namespaces", dir);
751 return PTR_ERR(dent);
753 ns_subns_dir(ns) = dent;
758 int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
761 struct aa_profile *child;
762 struct dentry *dent, *dir;
767 AA_BUG(!mutex_is_locked(&ns->lock));
770 name = ns->base.name;
772 /* create ns dir if it doesn't already exist */
773 dent = securityfs_create_dir(name, parent);
777 ns_dir(ns) = dir = dent;
778 error = __aa_fs_ns_mkdir_entries(ns, dir);
783 list_for_each_entry(child, &ns->base.profiles, base.list) {
784 error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
790 list_for_each_entry(sub, &ns->sub_ns, base.list) {
791 mutex_lock(&sub->lock);
792 error = __aa_fs_ns_mkdir(sub, ns_subns_dir(ns), NULL);
793 mutex_unlock(&sub->lock);
801 error = PTR_ERR(dent);
804 __aa_fs_ns_rmdir(ns);
810 #define list_entry_is_head(pos, head, member) (&pos->member == (head))
813 * __next_ns - find the next namespace to list
814 * @root: root namespace to stop search at (NOT NULL)
815 * @ns: current ns position (NOT NULL)
817 * Find the next namespace from @ns under @root and handle all locking needed
818 * while switching current namespace.
820 * Returns: next namespace or NULL if at last namespace under @root
821 * Requires: ns->parent->lock to be held
822 * NOTE: will not unlock root->lock
824 static struct aa_ns *__next_ns(struct aa_ns *root, struct aa_ns *ns)
826 struct aa_ns *parent, *next;
828 /* is next namespace a child */
829 if (!list_empty(&ns->sub_ns)) {
830 next = list_first_entry(&ns->sub_ns, typeof(*ns), base.list);
831 mutex_lock(&next->lock);
835 /* check if the next ns is a sibling, parent, gp, .. */
838 mutex_unlock(&ns->lock);
839 next = list_next_entry(ns, base.list);
840 if (!list_entry_is_head(next, &parent->sub_ns, base.list)) {
841 mutex_lock(&next->lock);
845 parent = parent->parent;
852 * __first_profile - find the first profile in a namespace
853 * @root: namespace that is root of profiles being displayed (NOT NULL)
854 * @ns: namespace to start in (NOT NULL)
856 * Returns: unrefcounted profile or NULL if no profile
857 * Requires: profile->ns.lock to be held
859 static struct aa_profile *__first_profile(struct aa_ns *root,
862 for (; ns; ns = __next_ns(root, ns)) {
863 if (!list_empty(&ns->base.profiles))
864 return list_first_entry(&ns->base.profiles,
865 struct aa_profile, base.list);
871 * __next_profile - step to the next profile in a profile tree
872 * @profile: current profile in tree (NOT NULL)
874 * Perform a depth first traversal on the profile tree in a namespace
876 * Returns: next profile or NULL if done
877 * Requires: profile->ns.lock to be held
879 static struct aa_profile *__next_profile(struct aa_profile *p)
881 struct aa_profile *parent;
882 struct aa_ns *ns = p->ns;
884 /* is next profile a child */
885 if (!list_empty(&p->base.profiles))
886 return list_first_entry(&p->base.profiles, typeof(*p),
889 /* is next profile a sibling, parent sibling, gp, sibling, .. */
890 parent = rcu_dereference_protected(p->parent,
891 mutex_is_locked(&p->ns->lock));
893 p = list_next_entry(p, base.list);
894 if (!list_entry_is_head(p, &parent->base.profiles, base.list))
897 parent = rcu_dereference_protected(parent->parent,
898 mutex_is_locked(&parent->ns->lock));
901 /* is next another profile in the namespace */
902 p = list_next_entry(p, base.list);
903 if (!list_entry_is_head(p, &ns->base.profiles, base.list))
910 * next_profile - step to the next profile in where ever it may be
911 * @root: root namespace (NOT NULL)
912 * @profile: current profile (NOT NULL)
914 * Returns: next profile or NULL if there isn't one
916 static struct aa_profile *next_profile(struct aa_ns *root,
917 struct aa_profile *profile)
919 struct aa_profile *next = __next_profile(profile);
923 /* finished all profiles in namespace move to next namespace */
924 return __first_profile(root, __next_ns(root, profile->ns));
928 * p_start - start a depth first traversal of profile tree
929 * @f: seq_file to fill
930 * @pos: current position
932 * Returns: first profile under current namespace or NULL if none found
934 * acquires first ns->lock
936 static void *p_start(struct seq_file *f, loff_t *pos)
938 struct aa_profile *profile = NULL;
939 struct aa_ns *root = aa_current_profile()->ns;
941 f->private = aa_get_ns(root);
944 /* find the first profile */
945 mutex_lock(&root->lock);
946 profile = __first_profile(root, root);
948 /* skip to position */
949 for (; profile && l > 0; l--)
950 profile = next_profile(root, profile);
956 * p_next - read the next profile entry
957 * @f: seq_file to fill
958 * @p: profile previously returned
959 * @pos: current position
961 * Returns: next profile after @p or NULL if none
963 * may acquire/release locks in namespace tree as necessary
965 static void *p_next(struct seq_file *f, void *p, loff_t *pos)
967 struct aa_profile *profile = p;
968 struct aa_ns *ns = f->private;
971 return next_profile(ns, profile);
975 * p_stop - stop depth first traversal
976 * @f: seq_file we are filling
977 * @p: the last profile writen
979 * Release all locking done by p_start/p_next on namespace tree
981 static void p_stop(struct seq_file *f, void *p)
983 struct aa_profile *profile = p;
984 struct aa_ns *root = f->private, *ns;
987 for (ns = profile->ns; ns && ns != root; ns = ns->parent)
988 mutex_unlock(&ns->lock);
990 mutex_unlock(&root->lock);
995 * seq_show_profile - show a profile entry
996 * @f: seq_file to file
997 * @p: current position (profile) (NOT NULL)
999 * Returns: error on failure
1001 static int seq_show_profile(struct seq_file *f, void *p)
1003 struct aa_profile *profile = (struct aa_profile *)p;
1004 struct aa_ns *root = f->private;
1006 if (profile->ns != root)
1007 seq_printf(f, ":%s://", aa_ns_name(root, profile->ns, true));
1008 seq_printf(f, "%s (%s)\n", profile->base.hname,
1009 aa_profile_mode_names[profile->mode]);
1014 static const struct seq_operations aa_fs_profiles_op = {
1018 .show = seq_show_profile,
1021 static int profiles_open(struct inode *inode, struct file *file)
1023 if (!policy_view_capable(NULL))
1026 return seq_open(file, &aa_fs_profiles_op);
1029 static int profiles_release(struct inode *inode, struct file *file)
1031 return seq_release(inode, file);
1034 static const struct file_operations aa_fs_profiles_fops = {
1035 .open = profiles_open,
1037 .llseek = seq_lseek,
1038 .release = profiles_release,
1042 /** Base file system setup **/
1043 static struct aa_fs_entry aa_fs_entry_file[] = {
1044 AA_FS_FILE_STRING("mask", "create read write exec append mmap_exec " \
1049 static struct aa_fs_entry aa_fs_entry_domain[] = {
1050 AA_FS_FILE_BOOLEAN("change_hat", 1),
1051 AA_FS_FILE_BOOLEAN("change_hatv", 1),
1052 AA_FS_FILE_BOOLEAN("change_onexec", 1),
1053 AA_FS_FILE_BOOLEAN("change_profile", 1),
1054 AA_FS_FILE_BOOLEAN("fix_binfmt_elf_mmap", 1),
1058 static struct aa_fs_entry aa_fs_entry_versions[] = {
1059 AA_FS_FILE_BOOLEAN("v5", 1),
1063 static struct aa_fs_entry aa_fs_entry_policy[] = {
1064 AA_FS_DIR("versions", aa_fs_entry_versions),
1065 AA_FS_FILE_BOOLEAN("set_load", 1),
1069 static struct aa_fs_entry aa_fs_entry_features[] = {
1070 AA_FS_DIR("policy", aa_fs_entry_policy),
1071 AA_FS_DIR("domain", aa_fs_entry_domain),
1072 AA_FS_DIR("file", aa_fs_entry_file),
1073 AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK),
1074 AA_FS_DIR("rlimit", aa_fs_entry_rlimit),
1075 AA_FS_DIR("caps", aa_fs_entry_caps),
1079 static struct aa_fs_entry aa_fs_entry_apparmor[] = {
1080 AA_FS_FILE_FOPS(".ns_level", 0666, &aa_fs_ns_level),
1081 AA_FS_FILE_FOPS(".ns_name", 0640, &aa_fs_ns_name),
1082 AA_FS_FILE_FOPS("profiles", 0440, &aa_fs_profiles_fops),
1083 AA_FS_DIR("features", aa_fs_entry_features),
1087 static struct aa_fs_entry aa_fs_entry =
1088 AA_FS_DIR("apparmor", aa_fs_entry_apparmor);
1091 * aafs_create_file - create a file entry in the apparmor securityfs
1092 * @fs_file: aa_fs_entry to build an entry for (NOT NULL)
1093 * @parent: the parent dentry in the securityfs
1095 * Use aafs_remove_file to remove entries created with this fn.
1097 static int __init aafs_create_file(struct aa_fs_entry *fs_file,
1098 struct dentry *parent)
1102 fs_file->dentry = securityfs_create_file(fs_file->name,
1103 S_IFREG | fs_file->mode,
1106 if (IS_ERR(fs_file->dentry)) {
1107 error = PTR_ERR(fs_file->dentry);
1108 fs_file->dentry = NULL;
1113 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir);
1115 * aafs_create_dir - recursively create a directory entry in the securityfs
1116 * @fs_dir: aa_fs_entry (and all child entries) to build (NOT NULL)
1117 * @parent: the parent dentry in the securityfs
1119 * Use aafs_remove_dir to remove entries created with this fn.
1121 static int __init aafs_create_dir(struct aa_fs_entry *fs_dir,
1122 struct dentry *parent)
1124 struct aa_fs_entry *fs_file;
1128 dir = securityfs_create_dir(fs_dir->name, parent);
1130 return PTR_ERR(dir);
1131 fs_dir->dentry = dir;
1133 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1134 if (fs_file->v_type == AA_FS_TYPE_DIR)
1135 error = aafs_create_dir(fs_file, fs_dir->dentry);
1137 error = aafs_create_file(fs_file, fs_dir->dentry);
1145 aafs_remove_dir(fs_dir);
1151 * aafs_remove_file - drop a single file entry in the apparmor securityfs
1152 * @fs_file: aa_fs_entry to detach from the securityfs (NOT NULL)
1154 static void __init aafs_remove_file(struct aa_fs_entry *fs_file)
1156 if (!fs_file->dentry)
1159 securityfs_remove(fs_file->dentry);
1160 fs_file->dentry = NULL;
1164 * aafs_remove_dir - recursively drop a directory entry from the securityfs
1165 * @fs_dir: aa_fs_entry (and all child entries) to detach (NOT NULL)
1167 static void __init aafs_remove_dir(struct aa_fs_entry *fs_dir)
1169 struct aa_fs_entry *fs_file;
1171 for (fs_file = fs_dir->v.files; fs_file && fs_file->name; ++fs_file) {
1172 if (fs_file->v_type == AA_FS_TYPE_DIR)
1173 aafs_remove_dir(fs_file);
1175 aafs_remove_file(fs_file);
1178 aafs_remove_file(fs_dir);
1182 * aa_destroy_aafs - cleanup and free aafs
1184 * releases dentries allocated by aa_create_aafs
1186 void __init aa_destroy_aafs(void)
1188 aafs_remove_dir(&aa_fs_entry);
1192 #define NULL_FILE_NAME ".null"
1193 struct path aa_null;
1195 static int aa_mk_null_file(struct dentry *parent)
1197 struct vfsmount *mount = NULL;
1198 struct dentry *dentry;
1199 struct inode *inode;
1201 int error = simple_pin_fs(parent->d_sb->s_type, &mount, &count);
1206 inode_lock(d_inode(parent));
1207 dentry = lookup_one_len(NULL_FILE_NAME, parent, strlen(NULL_FILE_NAME));
1208 if (IS_ERR(dentry)) {
1209 error = PTR_ERR(dentry);
1212 inode = new_inode(parent->d_inode->i_sb);
1218 inode->i_ino = get_next_ino();
1219 inode->i_mode = S_IFCHR | S_IRUGO | S_IWUGO;
1220 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
1221 init_special_inode(inode, S_IFCHR | S_IRUGO | S_IWUGO,
1222 MKDEV(MEM_MAJOR, 3));
1223 d_instantiate(dentry, inode);
1224 aa_null.dentry = dget(dentry);
1225 aa_null.mnt = mntget(mount);
1232 inode_unlock(d_inode(parent));
1233 simple_release_fs(&mount, &count);
1238 * aa_create_aafs - create the apparmor security filesystem
1240 * dentries created here are released by aa_destroy_aafs
1242 * Returns: error on failure
1244 static int __init aa_create_aafs(void)
1246 struct dentry *dent;
1249 if (!apparmor_initialized)
1252 if (aa_fs_entry.dentry) {
1253 AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
1257 /* Populate fs tree. */
1258 error = aafs_create_dir(&aa_fs_entry, NULL);
1262 dent = securityfs_create_file(".load", 0666, aa_fs_entry.dentry,
1263 NULL, &aa_fs_profile_load);
1265 error = PTR_ERR(dent);
1268 ns_subload(root_ns) = dent;
1270 dent = securityfs_create_file(".replace", 0666, aa_fs_entry.dentry,
1271 NULL, &aa_fs_profile_replace);
1273 error = PTR_ERR(dent);
1276 ns_subreplace(root_ns) = dent;
1278 dent = securityfs_create_file(".remove", 0666, aa_fs_entry.dentry,
1279 NULL, &aa_fs_profile_remove);
1281 error = PTR_ERR(dent);
1284 ns_subremove(root_ns) = dent;
1286 mutex_lock(&root_ns->lock);
1287 error = __aa_fs_ns_mkdir(root_ns, aa_fs_entry.dentry, "policy");
1288 mutex_unlock(&root_ns->lock);
1293 error = aa_mk_null_file(aa_fs_entry.dentry);
1297 /* TODO: add default profile to apparmorfs */
1299 /* Report that AppArmor fs is enabled */
1300 aa_info_message("AppArmor Filesystem Enabled");
1305 AA_ERROR("Error creating AppArmor securityfs\n");
1309 fs_initcall(aa_create_aafs);