2 * AppArmor security module
4 * This file contains AppArmor policy manipulation 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 * AppArmor policy is based around profiles, which contain the rules a
16 * task is confined by. Every task in the system has a profile attached
17 * to it determined either by matching "unconfined" tasks against the
18 * visible set of profiles or by following a profiles attachment rules.
20 * Each profile exists in a profile namespace which is a container of
21 * visible profiles. Each namespace contains a special "unconfined" profile,
22 * which doesn't enforce any confinement on a task beyond DAC.
24 * Namespace and profile names can be written together in either
26 * :namespace:profile - used by kernel interfaces for easy detection
27 * namespace://profile - used by policy
29 * Profile names can not start with : or @ or ^ and may not contain \0
31 * Reserved profile names
32 * unconfined - special automatically generated unconfined profile
33 * inherit - special name to indicate profile inheritance
34 * null-XXXX-YYYY - special automatically generated learning profiles
36 * Namespace names may not start with / or @ and may not contain \0 or :
37 * Reserved namespace names
38 * user-XXXX - user defined profiles
40 * a // in a profile or namespace name indicates a hierarchical name with the
41 * name before the // being the parent and the name after the child.
43 * Profile and namespace hierarchies serve two different but similar purposes.
44 * The namespace contains the set of visible profiles that are considered
45 * for attachment. The hierarchy of namespaces allows for virtualizing
46 * the namespace so that for example a chroot can have its own set of profiles
47 * which may define some local user namespaces.
48 * The profile hierarchy severs two distinct purposes,
49 * - it allows for sub profiles or hats, which allows an application to run
50 * subprograms under its own profile with different restriction than it
51 * self, and not have it use the system profile.
52 * eg. if a mail program starts an editor, the policy might make the
53 * restrictions tighter on the editor tighter than the mail program,
54 * and definitely different than general editor restrictions
55 * - it allows for binary hierarchy of profiles, so that execution history
56 * is preserved. This feature isn't exploited by AppArmor reference policy
57 * but is allowed. NOTE: this is currently suboptimal because profile
58 * aliasing is not currently implemented so that a profile for each
59 * level must be defined.
60 * eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started
63 * A profile or namespace name that can contain one or more // separators
64 * is referred to as an hname (hierarchical).
65 * eg. /bin/bash//bin/ls
67 * An fqname is a name that may contain both namespace and profile hnames.
68 * eg. :ns:/bin/bash//bin/ls
71 * - locking of profile lists is currently fairly coarse. All profile
72 * lists within a namespace use the namespace lock.
73 * FIXME: move profile lists to using rcu_lists
76 #include <linux/slab.h>
77 #include <linux/spinlock.h>
78 #include <linux/string.h>
80 #include "include/apparmor.h"
81 #include "include/capability.h"
82 #include "include/context.h"
83 #include "include/file.h"
84 #include "include/ipc.h"
85 #include "include/match.h"
86 #include "include/path.h"
87 #include "include/policy.h"
88 #include "include/policy_unpack.h"
89 #include "include/resource.h"
92 /* root profile namespace */
93 struct aa_namespace *root_ns;
95 const char *const aa_profile_mode_names[] = {
104 * Routines for AppArmor namespaces
107 static const char *hidden_ns_name = "---";
109 * aa_ns_visible - test if @view is visible from @curr
110 * @curr: namespace to treat as the parent (NOT NULL)
111 * @view: namespace to test if visible from @curr (NOT NULL)
113 * Returns: true if @view is visible from @curr else false
115 bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view)
120 for ( ; view; view = view->parent) {
121 if (view->parent == curr)
128 * aa_na_name - Find the ns name to display for @view from @curr
129 * @curr - current namespace (NOT NULL)
130 * @view - namespace attempting to view (NOT NULL)
132 * Returns: name of @view visible from @curr
134 const char *aa_ns_name(struct aa_namespace *curr, struct aa_namespace *view)
136 /* if view == curr then the namespace name isn't displayed */
140 if (aa_ns_visible(curr, view)) {
141 /* at this point if a ns is visible it is in a view ns
142 * thus the curr ns.hname is a prefix of its name.
143 * Only output the virtualized portion of the name
144 * Add + 2 to skip over // separating curr hname prefix
145 * from the visible tail of the views hname
147 return view->base.hname + strlen(curr->base.hname) + 2;
149 return hidden_ns_name;
153 * alloc_namespace - allocate, initialize and return a new namespace
154 * @prefix: parent namespace name (MAYBE NULL)
155 * @name: a preallocated name (NOT NULL)
157 * Returns: refcounted namespace or NULL on failure.
159 static struct aa_namespace *alloc_namespace(const char *prefix,
162 struct aa_namespace *ns;
164 ns = kzalloc(sizeof(*ns), GFP_KERNEL);
165 AA_DEBUG("%s(%p)\n", __func__, ns);
168 if (!aa_policy_init(&ns->base, prefix, name))
171 INIT_LIST_HEAD(&ns->sub_ns);
172 mutex_init(&ns->lock);
174 /* released by free_namespace */
175 ns->unconfined = aa_alloc_profile("unconfined");
177 goto fail_unconfined;
179 ns->unconfined->flags = PFLAG_IX_ON_NAME_ERROR |
180 PFLAG_IMMUTABLE | PFLAG_NS_COUNT;
181 ns->unconfined->mode = APPARMOR_UNCONFINED;
183 /* ns and ns->unconfined share ns->unconfined refcount */
184 ns->unconfined->ns = ns;
186 atomic_set(&ns->uniq_null, 0);
191 kzfree(ns->base.hname);
198 * free_namespace - free a profile namespace
199 * @ns: the namespace to free (MAYBE NULL)
201 * Requires: All references to the namespace must have been put, if the
202 * namespace was referenced by a profile confining a task,
204 static void free_namespace(struct aa_namespace *ns)
209 aa_policy_destroy(&ns->base);
210 aa_put_namespace(ns->parent);
212 ns->unconfined->ns = NULL;
213 aa_free_profile(ns->unconfined);
218 * __aa_find_namespace - find a namespace on a list by @name
219 * @head: list to search for namespace on (NOT NULL)
220 * @name: name of namespace to look for (NOT NULL)
222 * Returns: unrefcounted namespace
224 * Requires: rcu_read_lock be held
226 static struct aa_namespace *__aa_find_namespace(struct list_head *head,
229 return (struct aa_namespace *)__policy_find(head, name);
233 * aa_find_namespace - look up a profile namespace on the namespace list
234 * @root: namespace to search in (NOT NULL)
235 * @name: name of namespace to find (NOT NULL)
237 * Returns: a refcounted namespace on the list, or NULL if no namespace
238 * called @name exists.
240 * refcount released by caller
242 struct aa_namespace *aa_find_namespace(struct aa_namespace *root,
245 struct aa_namespace *ns = NULL;
248 ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
255 * aa_prepare_namespace - find an existing or create a new namespace of @name
256 * @name: the namespace to find or add (MAYBE NULL)
258 * Returns: refcounted namespace or NULL if failed to create one
260 static struct aa_namespace *aa_prepare_namespace(const char *name)
262 struct aa_namespace *ns, *root;
264 root = aa_current_profile()->ns;
266 mutex_lock(&root->lock);
268 /* if name isn't specified the profile is loaded to the current ns */
270 /* released by caller */
271 ns = aa_get_namespace(root);
275 /* try and find the specified ns and if it doesn't exist create it */
276 /* released by caller */
277 ns = aa_get_namespace(__aa_find_namespace(&root->sub_ns, name));
279 ns = alloc_namespace(root->base.hname, name);
282 if (__aa_fs_namespace_mkdir(ns, ns_subns_dir(root), name)) {
283 AA_ERROR("Failed to create interface for ns %s\n",
289 ns->parent = aa_get_namespace(root);
290 list_add_rcu(&ns->base.list, &root->sub_ns);
292 aa_get_namespace(ns);
295 mutex_unlock(&root->lock);
302 * __list_add_profile - add a profile to a list
303 * @list: list to add it to (NOT NULL)
304 * @profile: the profile to add (NOT NULL)
306 * refcount @profile, should be put by __list_remove_profile
308 * Requires: namespace lock be held, or list not be shared
310 static void __list_add_profile(struct list_head *list,
311 struct aa_profile *profile)
313 list_add_rcu(&profile->base.list, list);
314 /* get list reference */
315 aa_get_profile(profile);
319 * __list_remove_profile - remove a profile from the list it is on
320 * @profile: the profile to remove (NOT NULL)
322 * remove a profile from the list, warning generally removal should
323 * be done with __replace_profile as most profile removals are
324 * replacements to the unconfined profile.
326 * put @profile list refcount
328 * Requires: namespace lock be held, or list not have been live
330 static void __list_remove_profile(struct aa_profile *profile)
332 list_del_rcu(&profile->base.list);
333 aa_put_profile(profile);
336 static void __profile_list_release(struct list_head *head);
339 * __remove_profile - remove old profile, and children
340 * @profile: profile to be replaced (NOT NULL)
342 * Requires: namespace list lock be held, or list not be shared
344 static void __remove_profile(struct aa_profile *profile)
346 /* release any children lists first */
347 __profile_list_release(&profile->base.profiles);
348 /* released by free_profile */
349 __aa_update_replacedby(profile, profile->ns->unconfined);
350 __aa_fs_profile_rmdir(profile);
351 __list_remove_profile(profile);
355 * __profile_list_release - remove all profiles on the list and put refs
356 * @head: list of profiles (NOT NULL)
358 * Requires: namespace lock be held
360 static void __profile_list_release(struct list_head *head)
362 struct aa_profile *profile, *tmp;
363 list_for_each_entry_safe(profile, tmp, head, base.list)
364 __remove_profile(profile);
367 static void __ns_list_release(struct list_head *head);
370 * destroy_namespace - remove everything contained by @ns
371 * @ns: namespace to have it contents removed (NOT NULL)
373 static void destroy_namespace(struct aa_namespace *ns)
378 mutex_lock(&ns->lock);
379 /* release all profiles in this namespace */
380 __profile_list_release(&ns->base.profiles);
382 /* release all sub namespaces */
383 __ns_list_release(&ns->sub_ns);
386 __aa_update_replacedby(ns->unconfined, ns->parent->unconfined);
387 __aa_fs_namespace_rmdir(ns);
388 mutex_unlock(&ns->lock);
392 * __remove_namespace - remove a namespace and all its children
393 * @ns: namespace to be removed (NOT NULL)
395 * Requires: ns->parent->lock be held and ns removed from parent.
397 static void __remove_namespace(struct aa_namespace *ns)
399 /* remove ns from namespace list */
400 list_del_rcu(&ns->base.list);
401 destroy_namespace(ns);
402 aa_put_namespace(ns);
406 * __ns_list_release - remove all profile namespaces on the list put refs
407 * @head: list of profile namespaces (NOT NULL)
409 * Requires: namespace lock be held
411 static void __ns_list_release(struct list_head *head)
413 struct aa_namespace *ns, *tmp;
414 list_for_each_entry_safe(ns, tmp, head, base.list)
415 __remove_namespace(ns);
420 * aa_alloc_root_ns - allocate the root profile namespace
422 * Returns: %0 on success else error
425 int __init aa_alloc_root_ns(void)
427 /* released by aa_free_root_ns - used as list ref*/
428 root_ns = alloc_namespace(NULL, "root");
436 * aa_free_root_ns - free the root profile namespace
438 void __init aa_free_root_ns(void)
440 struct aa_namespace *ns = root_ns;
443 destroy_namespace(ns);
444 aa_put_namespace(ns);
448 static void free_replacedby(struct aa_replacedby *r)
451 /* r->profile will not be updated any more as r is dead */
452 aa_put_profile(rcu_dereference_protected(r->profile, true));
458 void aa_free_replacedby_kref(struct kref *kref)
460 struct aa_replacedby *r = container_of(kref, struct aa_replacedby,
466 * aa_free_profile - free a profile
467 * @profile: the profile to free (MAYBE NULL)
469 * Free a profile, its hats and null_profile. All references to the profile,
470 * its hats and null_profile must have been put.
472 * If the profile was referenced from a task context, free_profile() will
473 * be called from an rcu callback routine, so we must not sleep here.
475 void aa_free_profile(struct aa_profile *profile)
477 AA_DEBUG("%s(%p)\n", __func__, profile);
482 /* free children profiles */
483 aa_policy_destroy(&profile->base);
484 aa_put_profile(rcu_access_pointer(profile->parent));
486 aa_put_namespace(profile->ns);
487 kzfree(profile->rename);
489 aa_free_file_rules(&profile->file);
490 aa_free_cap_rules(&profile->caps);
491 aa_free_rlimit_rules(&profile->rlimits);
493 kzfree(profile->dirname);
494 aa_put_dfa(profile->xmatch);
495 aa_put_dfa(profile->policy.dfa);
496 aa_put_replacedby(profile->replacedby);
498 kzfree(profile->hash);
503 * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref)
504 * @head: rcu_head callback for freeing of a profile (NOT NULL)
506 static void aa_free_profile_rcu(struct rcu_head *head)
508 struct aa_profile *p = container_of(head, struct aa_profile, rcu);
509 if (p->flags & PFLAG_NS_COUNT)
510 free_namespace(p->ns);
516 * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile)
517 * @kr: kref callback for freeing of a profile (NOT NULL)
519 void aa_free_profile_kref(struct kref *kref)
521 struct aa_profile *p = container_of(kref, struct aa_profile, count);
522 call_rcu(&p->rcu, aa_free_profile_rcu);
526 * aa_alloc_profile - allocate, initialize and return a new profile
527 * @hname: name of the profile (NOT NULL)
529 * Returns: refcount profile or NULL on failure
531 struct aa_profile *aa_alloc_profile(const char *hname)
533 struct aa_profile *profile;
535 /* freed by free_profile - usually through aa_put_profile */
536 profile = kzalloc(sizeof(*profile), GFP_KERNEL);
540 profile->replacedby = kzalloc(sizeof(struct aa_replacedby), GFP_KERNEL);
541 if (!profile->replacedby)
543 kref_init(&profile->replacedby->count);
545 if (!aa_policy_init(&profile->base, NULL, hname))
547 kref_init(&profile->count);
549 /* refcount released by caller */
553 kzfree(profile->replacedby);
560 * aa_new_null_profile - create a new null-X learning profile
561 * @parent: profile that caused this profile to be created (NOT NULL)
562 * @hat: true if the null- learning profile is a hat
564 * Create a null- complain mode profile used in learning mode. The name of
565 * the profile is unique and follows the format of parent//null-<uniq>.
567 * null profiles are added to the profile list but the list does not
568 * hold a count on them so that they are automatically released when
571 * Returns: new refcounted profile else NULL on failure
573 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat)
575 struct aa_profile *profile = NULL;
577 int uniq = atomic_inc_return(&parent->ns->uniq_null);
580 name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, GFP_KERNEL);
583 sprintf(name, "%s//null-%x", parent->base.hname, uniq);
585 profile = aa_alloc_profile(name);
590 profile->mode = APPARMOR_COMPLAIN;
591 profile->flags = PFLAG_NULL;
593 profile->flags |= PFLAG_HAT;
595 /* released on free_profile */
596 rcu_assign_pointer(profile->parent, aa_get_profile(parent));
597 profile->ns = aa_get_namespace(parent->ns);
599 mutex_lock(&profile->ns->lock);
600 __list_add_profile(&parent->base.profiles, profile);
601 mutex_unlock(&profile->ns->lock);
603 /* refcount released by caller */
610 /* TODO: profile accounting - setup in remove */
613 * __find_child - find a profile on @head list with a name matching @name
614 * @head: list to search (NOT NULL)
615 * @name: name of profile (NOT NULL)
617 * Requires: rcu_read_lock be held
619 * Returns: unrefcounted profile ptr, or NULL if not found
621 static struct aa_profile *__find_child(struct list_head *head, const char *name)
623 return (struct aa_profile *)__policy_find(head, name);
627 * __strn_find_child - find a profile on @head list using substring of @name
628 * @head: list to search (NOT NULL)
629 * @name: name of profile (NOT NULL)
630 * @len: length of @name substring to match
632 * Requires: rcu_read_lock be held
634 * Returns: unrefcounted profile ptr, or NULL if not found
636 static struct aa_profile *__strn_find_child(struct list_head *head,
637 const char *name, int len)
639 return (struct aa_profile *)__policy_strn_find(head, name, len);
643 * aa_find_child - find a profile by @name in @parent
644 * @parent: profile to search (NOT NULL)
645 * @name: profile name to search for (NOT NULL)
647 * Returns: a refcounted profile or NULL if not found
649 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
651 struct aa_profile *profile;
655 profile = __find_child(&parent->base.profiles, name);
656 } while (profile && !aa_get_profile_not0(profile));
659 /* refcount released by caller */
664 * __lookup_parent - lookup the parent of a profile of name @hname
665 * @ns: namespace to lookup profile in (NOT NULL)
666 * @hname: hierarchical profile name to find parent of (NOT NULL)
668 * Lookups up the parent of a fully qualified profile name, the profile
669 * that matches hname does not need to exist, in general this
670 * is used to load a new profile.
672 * Requires: rcu_read_lock be held
674 * Returns: unrefcounted policy or NULL if not found
676 static struct aa_policy *__lookup_parent(struct aa_namespace *ns,
679 struct aa_policy *policy;
680 struct aa_profile *profile = NULL;
685 for (split = strstr(hname, "//"); split;) {
686 profile = __strn_find_child(&policy->profiles, hname,
690 policy = &profile->base;
692 split = strstr(hname, "//");
696 return &profile->base;
700 * __lookup_profile - lookup the profile matching @hname
701 * @base: base list to start looking up profile name from (NOT NULL)
702 * @hname: hierarchical profile name (NOT NULL)
704 * Requires: rcu_read_lock be held
706 * Returns: unrefcounted profile pointer or NULL if not found
708 * Do a relative name lookup, recursing through profile tree.
710 static struct aa_profile *__lookup_profile(struct aa_policy *base,
713 struct aa_profile *profile = NULL;
716 for (split = strstr(hname, "//"); split;) {
717 profile = __strn_find_child(&base->profiles, hname,
722 base = &profile->base;
724 split = strstr(hname, "//");
727 profile = __find_child(&base->profiles, hname);
733 * aa_lookup_profile - find a profile by its full or partial name
734 * @ns: the namespace to start from (NOT NULL)
735 * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
737 * Returns: refcounted profile or NULL if not found
739 struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname)
741 struct aa_profile *profile;
745 profile = __lookup_profile(&ns->base, hname);
746 } while (profile && !aa_get_profile_not0(profile));
749 /* the unconfined profile is not in the regular profile list */
750 if (!profile && strcmp(hname, "unconfined") == 0)
751 profile = aa_get_newest_profile(ns->unconfined);
753 /* refcount released by caller */
758 * replacement_allowed - test to see if replacement is allowed
759 * @profile: profile to test if it can be replaced (MAYBE NULL)
760 * @noreplace: true if replacement shouldn't be allowed but addition is okay
761 * @info: Returns - info about why replacement failed (NOT NULL)
763 * Returns: %0 if replacement allowed else error code
765 static int replacement_allowed(struct aa_profile *profile, int noreplace,
769 if (profile->flags & PFLAG_IMMUTABLE) {
770 *info = "cannot replace immutible profile";
772 } else if (noreplace) {
773 *info = "profile already exists";
781 * aa_audit_policy - Do auditing of policy changes
782 * @op: policy operation being performed
783 * @gfp: memory allocation flags
784 * @name: name of profile being manipulated (NOT NULL)
785 * @info: any extra information to be audited (MAYBE NULL)
788 * Returns: the error to be returned after audit is done
790 static int audit_policy(int op, gfp_t gfp, const char *name, const char *info,
793 struct common_audit_data sa;
794 struct apparmor_audit_data aad = {0,};
795 sa.type = LSM_AUDIT_DATA_NONE;
802 return aa_audit(AUDIT_APPARMOR_STATUS, __aa_current_profile(), gfp,
806 bool policy_view_capable(void)
808 struct user_namespace *user_ns = current_user_ns();
809 bool response = false;
811 if (ns_capable(user_ns, CAP_MAC_ADMIN))
817 bool policy_admin_capable(void)
819 return policy_view_capable() && !aa_g_lock_policy;
823 * aa_may_manage_policy - can the current task manage policy
824 * @op: the policy manipulation operation being done
826 * Returns: true if the task is allowed to manipulate policy
828 bool aa_may_manage_policy(int op)
830 /* check if loading policy is locked out */
831 if (aa_g_lock_policy) {
832 audit_policy(op, GFP_KERNEL, NULL, "policy_locked", -EACCES);
836 if (!policy_admin_capable()) {
837 audit_policy(op, GFP_KERNEL, NULL, "not policy admin", -EACCES);
844 static struct aa_profile *__list_lookup_parent(struct list_head *lh,
845 struct aa_profile *profile)
847 const char *base = hname_tail(profile->base.hname);
848 long len = base - profile->base.hname;
849 struct aa_load_ent *ent;
851 /* parent won't have trailing // so remove from len */
856 list_for_each_entry(ent, lh, list) {
857 if (ent->new == profile)
859 if (strncmp(ent->new->base.hname, profile->base.hname, len) ==
860 0 && ent->new->base.hname[len] == 0)
868 * __replace_profile - replace @old with @new on a list
869 * @old: profile to be replaced (NOT NULL)
870 * @new: profile to replace @old with (NOT NULL)
871 * @share_replacedby: transfer @old->replacedby to @new
873 * Will duplicate and refcount elements that @new inherits from @old
874 * and will inherit @old children.
876 * refcount @new for list, put @old list refcount
878 * Requires: namespace list lock be held, or list not be shared
880 static void __replace_profile(struct aa_profile *old, struct aa_profile *new,
881 bool share_replacedby)
883 struct aa_profile *child, *tmp;
885 if (!list_empty(&old->base.profiles)) {
887 list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu);
889 list_for_each_entry_safe(child, tmp, &lh, base.list) {
890 struct aa_profile *p;
892 list_del_init(&child->base.list);
893 p = __find_child(&new->base.profiles, child->base.name);
895 /* @p replaces @child */
896 __replace_profile(child, p, share_replacedby);
900 /* inherit @child and its children */
901 /* TODO: update hname of inherited children */
902 /* list refcount transferred to @new */
903 p = aa_deref_parent(child);
904 rcu_assign_pointer(child->parent, aa_get_profile(new));
905 list_add_rcu(&child->base.list, &new->base.profiles);
910 if (!rcu_access_pointer(new->parent)) {
911 struct aa_profile *parent = aa_deref_parent(old);
912 rcu_assign_pointer(new->parent, aa_get_profile(parent));
914 __aa_update_replacedby(old, new);
915 if (share_replacedby) {
916 aa_put_replacedby(new->replacedby);
917 new->replacedby = aa_get_replacedby(old->replacedby);
918 } else if (!rcu_access_pointer(new->replacedby->profile))
919 /* aafs interface uses replacedby */
920 rcu_assign_pointer(new->replacedby->profile,
921 aa_get_profile(new));
922 __aa_fs_profile_migrate_dents(old, new);
924 if (list_empty(&new->base.list)) {
925 /* new is not on a list already */
926 list_replace_rcu(&old->base.list, &new->base.list);
930 __list_remove_profile(old);
934 * __lookup_replace - lookup replacement information for a profile
935 * @ns - namespace the lookup occurs in
936 * @hname - name of profile to lookup
937 * @noreplace - true if not replacing an existing profile
938 * @p - Returns: profile to be replaced
939 * @info - Returns: info string on why lookup failed
941 * Returns: profile to replace (no ref) on success else ptr error
943 static int __lookup_replace(struct aa_namespace *ns, const char *hname,
944 bool noreplace, struct aa_profile **p,
947 *p = aa_get_profile(__lookup_profile(&ns->base, hname));
949 int error = replacement_allowed(*p, noreplace, info);
951 *info = "profile can not be replaced";
960 * aa_replace_profiles - replace profile(s) on the profile list
961 * @udata: serialized data stream (NOT NULL)
962 * @size: size of the serialized data stream
963 * @noreplace: true if only doing addition, no replacement allowed
965 * unpack and replace a profile on the profile list and uses of that profile
966 * by any aa_task_cxt. If the profile does not exist on the profile list
969 * Returns: size of data consumed else error code on failure.
971 ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace)
973 const char *ns_name, *info = NULL;
974 struct aa_namespace *ns = NULL;
975 struct aa_load_ent *ent, *tmp;
976 int op = OP_PROF_REPL;
981 error = aa_unpack(udata, size, &lh, &ns_name);
986 ns = aa_prepare_namespace(ns_name);
988 error = audit_policy(op, GFP_KERNEL, ns_name,
989 "failed to prepare namespace", -ENOMEM);
993 mutex_lock(&ns->lock);
994 /* setup parent and ns info */
995 list_for_each_entry(ent, &lh, list) {
996 struct aa_policy *policy;
997 error = __lookup_replace(ns, ent->new->base.hname, noreplace,
1002 if (ent->new->rename) {
1003 error = __lookup_replace(ns, ent->new->rename,
1004 noreplace, &ent->rename,
1010 /* released when @new is freed */
1011 ent->new->ns = aa_get_namespace(ns);
1013 if (ent->old || ent->rename)
1016 /* no ref on policy only use inside lock */
1017 policy = __lookup_parent(ns, ent->new->base.hname);
1019 struct aa_profile *p;
1020 p = __list_lookup_parent(&lh, ent->new);
1023 info = "parent does not exist";
1026 rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
1027 } else if (policy != &ns->base) {
1028 /* released on profile replacement or free_profile */
1029 struct aa_profile *p = (struct aa_profile *) policy;
1030 rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
1034 /* create new fs entries for introspection if needed */
1035 list_for_each_entry(ent, &lh, list) {
1037 /* inherit old interface files */
1040 TODO: support rename */
1041 /* } else if (ent->rename) {
1042 TODO: support rename */
1044 struct dentry *parent;
1045 if (rcu_access_pointer(ent->new->parent)) {
1046 struct aa_profile *p;
1047 p = aa_deref_parent(ent->new);
1048 parent = prof_child_dir(p);
1050 parent = ns_subprofs_dir(ent->new->ns);
1051 error = __aa_fs_profile_mkdir(ent->new, parent);
1055 info = "failed to create ";
1060 /* Done with checks that may fail - do actual replacement */
1061 list_for_each_entry_safe(ent, tmp, &lh, list) {
1062 list_del_init(&ent->list);
1063 op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
1065 audit_policy(op, GFP_ATOMIC, ent->new->base.hname, NULL, error);
1068 __replace_profile(ent->old, ent->new, 1);
1070 /* aafs interface uses replacedby */
1071 struct aa_replacedby *r = ent->new->replacedby;
1072 rcu_assign_pointer(r->profile,
1073 aa_get_profile(ent->new));
1074 __replace_profile(ent->rename, ent->new, 0);
1076 } else if (ent->rename) {
1077 /* aafs interface uses replacedby */
1078 rcu_assign_pointer(ent->new->replacedby->profile,
1079 aa_get_profile(ent->new));
1080 __replace_profile(ent->rename, ent->new, 0);
1081 } else if (ent->new->parent) {
1082 struct aa_profile *parent, *newest;
1083 parent = aa_deref_parent(ent->new);
1084 newest = aa_get_newest_profile(parent);
1086 /* parent replaced in this atomic set? */
1087 if (newest != parent) {
1088 aa_get_profile(newest);
1089 rcu_assign_pointer(ent->new->parent, newest);
1090 aa_put_profile(parent);
1092 /* aafs interface uses replacedby */
1093 rcu_assign_pointer(ent->new->replacedby->profile,
1094 aa_get_profile(ent->new));
1095 __list_add_profile(&newest->base.profiles, ent->new);
1096 aa_put_profile(newest);
1098 /* aafs interface uses replacedby */
1099 rcu_assign_pointer(ent->new->replacedby->profile,
1100 aa_get_profile(ent->new));
1101 __list_add_profile(&ns->base.profiles, ent->new);
1103 aa_load_ent_free(ent);
1105 mutex_unlock(&ns->lock);
1108 aa_put_namespace(ns);
1115 mutex_unlock(&ns->lock);
1117 /* audit cause of failure */
1118 op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
1119 audit_policy(op, GFP_KERNEL, ent->new->base.hname, info, error);
1120 /* audit status that rest of profiles in the atomic set failed too */
1121 info = "valid profile in failed atomic policy load";
1122 list_for_each_entry(tmp, &lh, list) {
1124 info = "unchecked profile in failed atomic policy load";
1125 /* skip entry that caused failure */
1128 op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
1129 audit_policy(op, GFP_KERNEL, tmp->new->base.hname, info, error);
1132 list_for_each_entry_safe(ent, tmp, &lh, list) {
1133 list_del_init(&ent->list);
1134 aa_load_ent_free(ent);
1141 * aa_remove_profiles - remove profile(s) from the system
1142 * @fqname: name of the profile or namespace to remove (NOT NULL)
1143 * @size: size of the name
1145 * Remove a profile or sub namespace from the current namespace, so that
1146 * they can not be found anymore and mark them as replaced by unconfined
1148 * NOTE: removing confinement does not restore rlimits to preconfinemnet values
1150 * Returns: size of data consume else error code if fails
1152 ssize_t aa_remove_profiles(char *fqname, size_t size)
1154 struct aa_namespace *root, *ns = NULL;
1155 struct aa_profile *profile = NULL;
1156 const char *name = fqname, *info = NULL;
1160 info = "no profile specified";
1165 root = aa_current_profile()->ns;
1167 if (fqname[0] == ':') {
1169 name = aa_split_fqname(fqname, &ns_name);
1170 /* released below */
1171 ns = aa_find_namespace(root, ns_name);
1173 info = "namespace does not exist";
1178 /* released below */
1179 ns = aa_get_namespace(root);
1182 /* remove namespace - can only happen if fqname[0] == ':' */
1183 mutex_lock(&ns->parent->lock);
1184 __remove_namespace(ns);
1185 mutex_unlock(&ns->parent->lock);
1187 /* remove profile */
1188 mutex_lock(&ns->lock);
1189 profile = aa_get_profile(__lookup_profile(&ns->base, name));
1192 info = "profile does not exist";
1195 name = profile->base.hname;
1196 __remove_profile(profile);
1197 mutex_unlock(&ns->lock);
1200 /* don't fail removal if audit fails */
1201 (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error);
1202 aa_put_namespace(ns);
1203 aa_put_profile(profile);
1207 mutex_unlock(&ns->lock);
1208 aa_put_namespace(ns);
1211 (void) audit_policy(OP_PROF_RM, GFP_KERNEL, name, info, error);