1 // SPDX-License-Identifier: GPL-2.0-only
3 * AppArmor security module
5 * This file contains AppArmor policy manipulation functions
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
10 * AppArmor policy is based around profiles, which contain the rules a
11 * task is confined by. Every task in the system has a profile attached
12 * to it determined either by matching "unconfined" tasks against the
13 * visible set of profiles or by following a profiles attachment rules.
15 * Each profile exists in a profile namespace which is a container of
16 * visible profiles. Each namespace contains a special "unconfined" profile,
17 * which doesn't enforce any confinement on a task beyond DAC.
19 * Namespace and profile names can be written together in either
21 * :namespace:profile - used by kernel interfaces for easy detection
22 * namespace://profile - used by policy
24 * Profile names can not start with : or @ or ^ and may not contain \0
26 * Reserved profile names
27 * unconfined - special automatically generated unconfined profile
28 * inherit - special name to indicate profile inheritance
29 * null-XXXX-YYYY - special automatically generated learning profiles
31 * Namespace names may not start with / or @ and may not contain \0 or :
32 * Reserved namespace names
33 * user-XXXX - user defined profiles
35 * a // in a profile or namespace name indicates a hierarchical name with the
36 * name before the // being the parent and the name after the child.
38 * Profile and namespace hierarchies serve two different but similar purposes.
39 * The namespace contains the set of visible profiles that are considered
40 * for attachment. The hierarchy of namespaces allows for virtualizing
41 * the namespace so that for example a chroot can have its own set of profiles
42 * which may define some local user namespaces.
43 * The profile hierarchy severs two distinct purposes,
44 * - it allows for sub profiles or hats, which allows an application to run
45 * subprograms under its own profile with different restriction than it
46 * self, and not have it use the system profile.
47 * eg. if a mail program starts an editor, the policy might make the
48 * restrictions tighter on the editor tighter than the mail program,
49 * and definitely different than general editor restrictions
50 * - it allows for binary hierarchy of profiles, so that execution history
51 * is preserved. This feature isn't exploited by AppArmor reference policy
52 * but is allowed. NOTE: this is currently suboptimal because profile
53 * aliasing is not currently implemented so that a profile for each
54 * level must be defined.
55 * eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started
58 * A profile or namespace name that can contain one or more // separators
59 * is referred to as an hname (hierarchical).
60 * eg. /bin/bash//bin/ls
62 * An fqname is a name that may contain both namespace and profile hnames.
63 * eg. :ns:/bin/bash//bin/ls
66 * - locking of profile lists is currently fairly coarse. All profile
67 * lists within a namespace use the namespace lock.
68 * FIXME: move profile lists to using rcu_lists
71 #include <linux/slab.h>
72 #include <linux/spinlock.h>
73 #include <linux/string.h>
74 #include <linux/cred.h>
75 #include <linux/rculist.h>
76 #include <linux/user_namespace.h>
78 #include "include/apparmor.h"
79 #include "include/capability.h"
80 #include "include/cred.h"
81 #include "include/file.h"
82 #include "include/ipc.h"
83 #include "include/match.h"
84 #include "include/path.h"
85 #include "include/policy.h"
86 #include "include/policy_ns.h"
87 #include "include/policy_unpack.h"
88 #include "include/resource.h"
90 int unprivileged_userns_apparmor_policy = 1;
91 int aa_unprivileged_unconfined_restricted;
93 const char *const aa_profile_mode_names[] = {
102 static void aa_free_pdb(struct aa_policydb *pdb)
105 aa_put_dfa(pdb->dfa);
108 aa_free_str_table(&pdb->trans);
114 * aa_pdb_free_kref - free aa_policydb by kref (called by aa_put_pdb)
115 * @kref: kref callback for freeing of a dfa (NOT NULL)
117 void aa_pdb_free_kref(struct kref *kref)
119 struct aa_policydb *pdb = container_of(kref, struct aa_policydb, count);
125 struct aa_policydb *aa_alloc_pdb(gfp_t gfp)
127 struct aa_policydb *pdb = kzalloc(sizeof(struct aa_policydb), gfp);
132 kref_init(&pdb->count);
139 * __add_profile - add a profiles to list and label tree
140 * @list: list to add it to (NOT NULL)
141 * @profile: the profile to add (NOT NULL)
143 * refcount @profile, should be put by __list_remove_profile
145 * Requires: namespace lock be held, or list not be shared
147 static void __add_profile(struct list_head *list, struct aa_profile *profile)
153 AA_BUG(!profile->ns);
154 AA_BUG(!mutex_is_locked(&profile->ns->lock));
156 list_add_rcu(&profile->base.list, list);
157 /* get list reference */
158 aa_get_profile(profile);
159 l = aa_label_insert(&profile->ns->labels, &profile->label);
160 AA_BUG(l != &profile->label);
165 * __list_remove_profile - remove a profile from the list it is on
166 * @profile: the profile to remove (NOT NULL)
168 * remove a profile from the list, warning generally removal should
169 * be done with __replace_profile as most profile removals are
170 * replacements to the unconfined profile.
172 * put @profile list refcount
174 * Requires: namespace lock be held, or list not have been live
176 static void __list_remove_profile(struct aa_profile *profile)
179 AA_BUG(!profile->ns);
180 AA_BUG(!mutex_is_locked(&profile->ns->lock));
182 list_del_rcu(&profile->base.list);
183 aa_put_profile(profile);
187 * __remove_profile - remove old profile, and children
188 * @profile: profile to be replaced (NOT NULL)
190 * Requires: namespace list lock be held, or list not be shared
192 static void __remove_profile(struct aa_profile *profile)
195 AA_BUG(!profile->ns);
196 AA_BUG(!mutex_is_locked(&profile->ns->lock));
198 /* release any children lists first */
199 __aa_profile_list_release(&profile->base.profiles);
200 /* released by free_profile */
201 aa_label_remove(&profile->label);
202 __aafs_profile_rmdir(profile);
203 __list_remove_profile(profile);
207 * __aa_profile_list_release - remove all profiles on the list and put refs
208 * @head: list of profiles (NOT NULL)
210 * Requires: namespace lock be held
212 void __aa_profile_list_release(struct list_head *head)
214 struct aa_profile *profile, *tmp;
215 list_for_each_entry_safe(profile, tmp, head, base.list)
216 __remove_profile(profile);
220 * aa_free_data - free a data blob
224 static void aa_free_data(void *ptr, void *arg)
226 struct aa_data *data = ptr;
228 kfree_sensitive(data->data);
229 kfree_sensitive(data->key);
230 kfree_sensitive(data);
233 static void free_attachment(struct aa_attachment *attach)
237 for (i = 0; i < attach->xattr_count; i++)
238 kfree_sensitive(attach->xattrs[i]);
239 kfree_sensitive(attach->xattrs);
240 aa_put_pdb(attach->xmatch);
243 static void free_ruleset(struct aa_ruleset *rules)
247 aa_put_pdb(rules->file);
248 aa_put_pdb(rules->policy);
249 aa_free_cap_rules(&rules->caps);
250 aa_free_rlimit_rules(&rules->rlimits);
252 for (i = 0; i < rules->secmark_count; i++)
253 kfree_sensitive(rules->secmark[i].label);
254 kfree_sensitive(rules->secmark);
255 kfree_sensitive(rules);
258 struct aa_ruleset *aa_alloc_ruleset(gfp_t gfp)
260 struct aa_ruleset *rules;
262 rules = kzalloc(sizeof(*rules), gfp);
264 INIT_LIST_HEAD(&rules->list);
270 * aa_free_profile - free a profile
271 * @profile: the profile to free (MAYBE NULL)
273 * Free a profile, its hats and null_profile. All references to the profile,
274 * its hats and null_profile must have been put.
276 * If the profile was referenced from a task context, free_profile() will
277 * be called from an rcu callback routine, so we must not sleep here.
279 void aa_free_profile(struct aa_profile *profile)
281 struct aa_ruleset *rule, *tmp;
282 struct rhashtable *rht;
284 AA_DEBUG("%s(%p)\n", __func__, profile);
289 /* free children profiles */
290 aa_policy_destroy(&profile->base);
291 aa_put_profile(rcu_access_pointer(profile->parent));
293 aa_put_ns(profile->ns);
294 kfree_sensitive(profile->rename);
295 kfree_sensitive(profile->disconnected);
297 free_attachment(&profile->attach);
300 * at this point there are no tasks that can have a reference
303 list_for_each_entry_safe(rule, tmp, &profile->rules, list) {
304 list_del_init(&rule->list);
307 kfree_sensitive(profile->dirname);
311 profile->data = NULL;
312 rhashtable_free_and_destroy(rht, aa_free_data, NULL);
313 kfree_sensitive(rht);
316 kfree_sensitive(profile->hash);
317 aa_put_loaddata(profile->rawdata);
318 aa_label_destroy(&profile->label);
320 kfree_sensitive(profile);
324 * aa_alloc_profile - allocate, initialize and return a new profile
325 * @hname: name of the profile (NOT NULL)
326 * @proxy: proxy to use OR null if to allocate a new one
327 * @gfp: allocation type
329 * Returns: refcount profile or NULL on failure
331 struct aa_profile *aa_alloc_profile(const char *hname, struct aa_proxy *proxy,
334 struct aa_profile *profile;
335 struct aa_ruleset *rules;
337 /* freed by free_profile - usually through aa_put_profile */
338 profile = kzalloc(struct_size(profile, label.vec, 2), gfp);
342 if (!aa_policy_init(&profile->base, NULL, hname, gfp))
344 if (!aa_label_init(&profile->label, 1, gfp))
347 INIT_LIST_HEAD(&profile->rules);
349 /* allocate the first ruleset, but leave it empty */
350 rules = aa_alloc_ruleset(gfp);
353 list_add(&rules->list, &profile->rules);
355 /* update being set needed by fs interface */
357 proxy = aa_alloc_proxy(&profile->label, gfp);
362 profile->label.proxy = proxy;
364 profile->label.hname = profile->base.hname;
365 profile->label.flags |= FLAG_PROFILE;
366 profile->label.vec[0] = profile;
368 /* refcount released by caller */
372 aa_free_profile(profile);
377 /* TODO: profile accounting - setup in remove */
380 * __strn_find_child - find a profile on @head list using substring of @name
381 * @head: list to search (NOT NULL)
382 * @name: name of profile (NOT NULL)
383 * @len: length of @name substring to match
385 * Requires: rcu_read_lock be held
387 * Returns: unrefcounted profile ptr, or NULL if not found
389 static struct aa_profile *__strn_find_child(struct list_head *head,
390 const char *name, int len)
392 return (struct aa_profile *)__policy_strn_find(head, name, len);
396 * __find_child - find a profile on @head list with a name matching @name
397 * @head: list to search (NOT NULL)
398 * @name: name of profile (NOT NULL)
400 * Requires: rcu_read_lock be held
402 * Returns: unrefcounted profile ptr, or NULL if not found
404 static struct aa_profile *__find_child(struct list_head *head, const char *name)
406 return __strn_find_child(head, name, strlen(name));
410 * aa_find_child - find a profile by @name in @parent
411 * @parent: profile to search (NOT NULL)
412 * @name: profile name to search for (NOT NULL)
414 * Returns: a refcounted profile or NULL if not found
416 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
418 struct aa_profile *profile;
422 profile = __find_child(&parent->base.profiles, name);
423 } while (profile && !aa_get_profile_not0(profile));
426 /* refcount released by caller */
431 * __lookup_parent - lookup the parent of a profile of name @hname
432 * @ns: namespace to lookup profile in (NOT NULL)
433 * @hname: hierarchical profile name to find parent of (NOT NULL)
435 * Lookups up the parent of a fully qualified profile name, the profile
436 * that matches hname does not need to exist, in general this
437 * is used to load a new profile.
439 * Requires: rcu_read_lock be held
441 * Returns: unrefcounted policy or NULL if not found
443 static struct aa_policy *__lookup_parent(struct aa_ns *ns,
446 struct aa_policy *policy;
447 struct aa_profile *profile = NULL;
452 for (split = strstr(hname, "//"); split;) {
453 profile = __strn_find_child(&policy->profiles, hname,
457 policy = &profile->base;
459 split = strstr(hname, "//");
463 return &profile->base;
467 * __create_missing_ancestors - create place holders for missing ancestores
468 * @ns: namespace to lookup profile in (NOT NULL)
469 * @hname: hierarchical profile name to find parent of (NOT NULL)
470 * @gfp: type of allocation.
472 * Requires: ns mutex lock held
474 * Return: unrefcounted parent policy on success or %NULL if error creating
475 * place holder profiles.
477 static struct aa_policy *__create_missing_ancestors(struct aa_ns *ns,
481 struct aa_policy *policy;
482 struct aa_profile *parent, *profile = NULL;
490 for (split = strstr(hname, "//"); split;) {
492 profile = __strn_find_child(&policy->profiles, hname,
495 const char *name = kstrndup(hname, split - hname,
499 profile = aa_alloc_null(parent, name, gfp);
504 profile->ns = aa_get_ns(ns);
506 policy = &profile->base;
508 split = strstr(hname, "//");
512 return &profile->base;
516 * __lookupn_profile - lookup the profile matching @hname
517 * @base: base list to start looking up profile name from (NOT NULL)
518 * @hname: hierarchical profile name (NOT NULL)
519 * @n: length of @hname
521 * Requires: rcu_read_lock be held
523 * Returns: unrefcounted profile pointer or NULL if not found
525 * Do a relative name lookup, recursing through profile tree.
527 static struct aa_profile *__lookupn_profile(struct aa_policy *base,
528 const char *hname, size_t n)
530 struct aa_profile *profile = NULL;
533 for (split = strnstr(hname, "//", n); split;
534 split = strnstr(hname, "//", n)) {
535 profile = __strn_find_child(&base->profiles, hname,
540 base = &profile->base;
541 n -= split + 2 - hname;
546 return __strn_find_child(&base->profiles, hname, n);
550 static struct aa_profile *__lookup_profile(struct aa_policy *base,
553 return __lookupn_profile(base, hname, strlen(hname));
557 * aa_lookupn_profile - find a profile by its full or partial name
558 * @ns: the namespace to start from (NOT NULL)
559 * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
562 * Returns: refcounted profile or NULL if not found
564 struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
567 struct aa_profile *profile;
571 profile = __lookupn_profile(&ns->base, hname, n);
572 } while (profile && !aa_get_profile_not0(profile));
575 /* the unconfined profile is not in the regular profile list */
576 if (!profile && strncmp(hname, "unconfined", n) == 0)
577 profile = aa_get_newest_profile(ns->unconfined);
579 /* refcount released by caller */
583 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname)
585 return aa_lookupn_profile(ns, hname, strlen(hname));
588 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base,
589 const char *fqname, size_t n)
591 struct aa_profile *profile;
593 const char *name, *ns_name;
596 name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len);
598 ns = aa_lookupn_ns(labels_ns(base), ns_name, ns_len);
602 ns = aa_get_ns(labels_ns(base));
605 profile = aa_lookupn_profile(ns, name, n - (name - fqname));
607 /* default profile for ns, currently unconfined */
608 profile = aa_get_newest_profile(ns->unconfined);
617 struct aa_profile *aa_alloc_null(struct aa_profile *parent, const char *name,
620 struct aa_profile *profile;
621 struct aa_ruleset *rules;
623 profile = aa_alloc_profile(name, NULL, gfp);
627 /* TODO: ideally we should inherit abi from parent */
628 profile->label.flags |= FLAG_NULL;
629 rules = list_first_entry(&profile->rules, typeof(*rules), list);
630 rules->file = aa_get_pdb(nullpdb);
631 rules->policy = aa_get_pdb(nullpdb);
634 profile->path_flags = parent->path_flags;
636 /* released on free_profile */
637 rcu_assign_pointer(profile->parent, aa_get_profile(parent));
638 profile->ns = aa_get_ns(parent->ns);
645 * aa_new_learning_profile - create or find a null-X learning profile
646 * @parent: profile that caused this profile to be created (NOT NULL)
647 * @hat: true if the null- learning profile is a hat
648 * @base: name to base the null profile off of
649 * @gfp: type of allocation
651 * Find/Create a null- complain mode profile used in learning mode. The
652 * name of the profile is unique and follows the format of parent//null-XXX.
653 * where XXX is based on the @name or if that fails or is not supplied
656 * null profiles are added to the profile list but the list does not
657 * hold a count on them so that they are automatically released when
660 * Returns: new refcounted profile else NULL on failure
662 struct aa_profile *aa_new_learning_profile(struct aa_profile *parent, bool hat,
663 const char *base, gfp_t gfp)
665 struct aa_profile *p, *profile;
672 name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base),
675 sprintf(name, "%s//null-%s", parent->base.hname, base);
678 /* fall through to try shorter uniq */
681 name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp);
684 sprintf(name, "%s//null-%x", parent->base.hname,
685 atomic_inc_return(&parent->ns->uniq_null));
688 /* lookup to see if this is a dup creation */
689 bname = basename(name);
690 profile = aa_find_child(parent, bname);
694 profile = aa_alloc_null(parent, name, gfp);
697 profile->mode = APPARMOR_COMPLAIN;
699 profile->label.flags |= FLAG_HAT;
701 mutex_lock_nested(&profile->ns->lock, profile->ns->level);
702 p = __find_child(&parent->base.profiles, bname);
704 aa_free_profile(profile);
705 profile = aa_get_profile(p);
707 __add_profile(&parent->base.profiles, profile);
709 mutex_unlock(&profile->ns->lock);
711 /* refcount released by caller */
719 aa_free_profile(profile);
724 * replacement_allowed - test to see if replacement is allowed
725 * @profile: profile to test if it can be replaced (MAYBE NULL)
726 * @noreplace: true if replacement shouldn't be allowed but addition is okay
727 * @info: Returns - info about why replacement failed (NOT NULL)
729 * Returns: %0 if replacement allowed else error code
731 static int replacement_allowed(struct aa_profile *profile, int noreplace,
735 if (profile->label.flags & FLAG_IMMUTIBLE) {
736 *info = "cannot replace immutable profile";
738 } else if (noreplace) {
739 *info = "profile already exists";
746 /* audit callback for net specific fields */
747 static void audit_cb(struct audit_buffer *ab, void *va)
749 struct common_audit_data *sa = va;
750 struct apparmor_audit_data *ad = aad(sa);
753 audit_log_format(ab, " ns=");
754 audit_log_untrustedstring(ab, ad->iface.ns);
759 * audit_policy - Do auditing of policy changes
760 * @subj_label: label to check if it can manage policy
761 * @op: policy operation being performed
762 * @ns_name: name of namespace being manipulated
763 * @name: name of profile being manipulated (NOT NULL)
764 * @info: any extra information to be audited (MAYBE NULL)
767 * Returns: the error to be returned after audit is done
769 static int audit_policy(struct aa_label *subj_label, const char *op,
770 const char *ns_name, const char *name,
771 const char *info, int error)
773 DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_NONE, op);
775 ad.iface.ns = ns_name;
779 ad.subj_label = subj_label;
781 aa_audit_msg(AUDIT_APPARMOR_STATUS, &ad, audit_cb);
786 /* don't call out to other LSMs in the stack for apparmor policy admin
789 static int policy_ns_capable(const struct cred *subj_cred,
790 struct aa_label *label,
791 struct user_namespace *userns, int cap)
795 /* check for MAC_ADMIN cap in cred */
796 err = cap_capable(subj_cred, userns, cap, CAP_OPT_NONE);
798 err = aa_capable(subj_cred, label, cap, CAP_OPT_NONE);
804 * aa_policy_view_capable - check if viewing policy in at @ns is allowed
805 * @subj_cred: cred of subject
806 * @label: label that is trying to view policy in ns
807 * @ns: namespace being viewed by @label (may be NULL if @label's ns)
809 * Returns: true if viewing policy is allowed
811 * If @ns is NULL then the namespace being viewed is assumed to be the
812 * tasks current namespace.
814 bool aa_policy_view_capable(const struct cred *subj_cred,
815 struct aa_label *label, struct aa_ns *ns)
817 struct user_namespace *user_ns = subj_cred->user_ns;
818 struct aa_ns *view_ns = labels_view(label);
819 bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) ||
820 in_egroup_p(make_kgid(user_ns, 0));
821 bool response = false;
825 if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) &&
826 (user_ns == &init_user_ns ||
827 (unprivileged_userns_apparmor_policy != 0 &&
828 user_ns->level == view_ns->level)))
834 bool aa_policy_admin_capable(const struct cred *subj_cred,
835 struct aa_label *label, struct aa_ns *ns)
837 struct user_namespace *user_ns = subj_cred->user_ns;
838 bool capable = policy_ns_capable(subj_cred, label, user_ns,
841 AA_DEBUG("cap_mac_admin? %d\n", capable);
842 AA_DEBUG("policy locked? %d\n", aa_g_lock_policy);
844 return aa_policy_view_capable(subj_cred, label, ns) && capable &&
848 bool aa_current_policy_view_capable(struct aa_ns *ns)
850 struct aa_label *label;
853 label = __begin_current_label_crit_section();
854 res = aa_policy_view_capable(current_cred(), label, ns);
855 __end_current_label_crit_section(label);
860 bool aa_current_policy_admin_capable(struct aa_ns *ns)
862 struct aa_label *label;
865 label = __begin_current_label_crit_section();
866 res = aa_policy_admin_capable(current_cred(), label, ns);
867 __end_current_label_crit_section(label);
873 * aa_may_manage_policy - can the current task manage policy
874 * @subj_cred: subjects cred
875 * @label: label to check if it can manage policy
876 * @ns: namespace being managed by @label (may be NULL if @label's ns)
877 * @mask: contains the policy manipulation operation being done
879 * Returns: 0 if the task is allowed to manipulate policy else error
881 int aa_may_manage_policy(const struct cred *subj_cred, struct aa_label *label,
882 struct aa_ns *ns, u32 mask)
886 if (mask & AA_MAY_REMOVE_POLICY)
888 else if (mask & AA_MAY_REPLACE_POLICY)
893 /* check if loading policy is locked out */
894 if (aa_g_lock_policy)
895 return audit_policy(label, op, NULL, NULL, "policy_locked",
898 if (!aa_policy_admin_capable(subj_cred, label, ns))
899 return audit_policy(label, op, NULL, NULL, "not policy admin",
902 /* TODO: add fine grained mediation of policy loads */
906 static struct aa_profile *__list_lookup_parent(struct list_head *lh,
907 struct aa_profile *profile)
909 const char *base = basename(profile->base.hname);
910 long len = base - profile->base.hname;
911 struct aa_load_ent *ent;
913 /* parent won't have trailing // so remove from len */
918 list_for_each_entry(ent, lh, list) {
919 if (ent->new == profile)
921 if (strncmp(ent->new->base.hname, profile->base.hname, len) ==
922 0 && ent->new->base.hname[len] == 0)
930 * __replace_profile - replace @old with @new on a list
931 * @old: profile to be replaced (NOT NULL)
932 * @new: profile to replace @old with (NOT NULL)
934 * Will duplicate and refcount elements that @new inherits from @old
935 * and will inherit @old children.
937 * refcount @new for list, put @old list refcount
939 * Requires: namespace list lock be held, or list not be shared
941 static void __replace_profile(struct aa_profile *old, struct aa_profile *new)
943 struct aa_profile *child, *tmp;
945 if (!list_empty(&old->base.profiles)) {
947 list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu);
949 list_for_each_entry_safe(child, tmp, &lh, base.list) {
950 struct aa_profile *p;
952 list_del_init(&child->base.list);
953 p = __find_child(&new->base.profiles, child->base.name);
955 /* @p replaces @child */
956 __replace_profile(child, p);
960 /* inherit @child and its children */
961 /* TODO: update hname of inherited children */
962 /* list refcount transferred to @new */
963 p = aa_deref_parent(child);
964 rcu_assign_pointer(child->parent, aa_get_profile(new));
965 list_add_rcu(&child->base.list, &new->base.profiles);
970 if (!rcu_access_pointer(new->parent)) {
971 struct aa_profile *parent = aa_deref_parent(old);
972 rcu_assign_pointer(new->parent, aa_get_profile(parent));
974 aa_label_replace(&old->label, &new->label);
975 /* migrate dents must come after label replacement b/c update */
976 __aafs_profile_migrate_dents(old, new);
978 if (list_empty(&new->base.list)) {
979 /* new is not on a list already */
980 list_replace_rcu(&old->base.list, &new->base.list);
984 __list_remove_profile(old);
988 * __lookup_replace - lookup replacement information for a profile
989 * @ns: namespace the lookup occurs in
990 * @hname: name of profile to lookup
991 * @noreplace: true if not replacing an existing profile
992 * @p: Returns - profile to be replaced
993 * @info: Returns - info string on why lookup failed
995 * Returns: profile to replace (no ref) on success else ptr error
997 static int __lookup_replace(struct aa_ns *ns, const char *hname,
998 bool noreplace, struct aa_profile **p,
1001 *p = aa_get_profile(__lookup_profile(&ns->base, hname));
1003 int error = replacement_allowed(*p, noreplace, info);
1005 *info = "profile can not be replaced";
1013 static void share_name(struct aa_profile *old, struct aa_profile *new)
1015 aa_put_str(new->base.hname);
1016 aa_get_str(old->base.hname);
1017 new->base.hname = old->base.hname;
1018 new->base.name = old->base.name;
1019 new->label.hname = old->label.hname;
1022 /* Update to newest version of parent after previous replacements
1023 * Returns: unrefcount newest version of parent
1025 static struct aa_profile *update_to_newest_parent(struct aa_profile *new)
1027 struct aa_profile *parent, *newest;
1029 parent = rcu_dereference_protected(new->parent,
1030 mutex_is_locked(&new->ns->lock));
1031 newest = aa_get_newest_profile(parent);
1033 /* parent replaced in this atomic set? */
1034 if (newest != parent) {
1035 aa_put_profile(parent);
1036 rcu_assign_pointer(new->parent, newest);
1038 aa_put_profile(newest);
1044 * aa_replace_profiles - replace profile(s) on the profile list
1045 * @policy_ns: namespace load is occurring on
1046 * @label: label that is attempting to load/replace policy
1047 * @mask: permission mask
1048 * @udata: serialized data stream (NOT NULL)
1050 * unpack and replace a profile on the profile list and uses of that profile
1051 * by any task creds via invalidating the old version of the profile, which
1052 * tasks will notice to update their own cred. If the profile does not exist
1053 * on the profile list it is added.
1055 * Returns: size of data consumed else error code on failure.
1057 ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label,
1058 u32 mask, struct aa_loaddata *udata)
1060 const char *ns_name = NULL, *info = NULL;
1061 struct aa_ns *ns = NULL;
1062 struct aa_load_ent *ent, *tmp;
1063 struct aa_loaddata *rawdata_ent;
1065 ssize_t count, error;
1068 op = mask & AA_MAY_REPLACE_POLICY ? OP_PROF_REPL : OP_PROF_LOAD;
1069 aa_get_loaddata(udata);
1070 /* released below */
1071 error = aa_unpack(udata, &lh, &ns_name);
1075 /* ensure that profiles are all for the same ns
1076 * TODO: update locking to remove this constaint. All profiles in
1077 * the load set must succeed as a set or the load will
1078 * fail. Sort ent list and take ns locks in hierarchy order
1081 list_for_each_entry(ent, &lh, list) {
1084 strcmp(ent->ns_name, ns_name) != 0) {
1085 info = "policy load has mixed namespaces";
1089 } else if (ent->ns_name) {
1091 info = "policy load has mixed namespaces";
1095 ns_name = ent->ns_name;
1100 ns = aa_prepare_ns(policy_ns ? policy_ns : labels_ns(label),
1104 info = "failed to prepare namespace";
1105 error = PTR_ERR(ns);
1111 ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(label));
1113 mutex_lock_nested(&ns->lock, ns->level);
1114 /* check for duplicate rawdata blobs: space and file dedup */
1115 if (!list_empty(&ns->rawdata_list)) {
1116 list_for_each_entry(rawdata_ent, &ns->rawdata_list, list) {
1117 if (aa_rawdata_eq(rawdata_ent, udata)) {
1118 struct aa_loaddata *tmp;
1120 tmp = __aa_get_loaddata(rawdata_ent);
1121 /* check we didn't fail the race */
1123 aa_put_loaddata(udata);
1130 /* setup parent and ns info */
1131 list_for_each_entry(ent, &lh, list) {
1132 struct aa_policy *policy;
1133 struct aa_profile *p;
1135 if (aa_g_export_binary)
1136 ent->new->rawdata = aa_get_loaddata(udata);
1137 error = __lookup_replace(ns, ent->new->base.hname,
1138 !(mask & AA_MAY_REPLACE_POLICY),
1143 if (ent->new->rename) {
1144 error = __lookup_replace(ns, ent->new->rename,
1145 !(mask & AA_MAY_REPLACE_POLICY),
1146 &ent->rename, &info);
1151 /* released when @new is freed */
1152 ent->new->ns = aa_get_ns(ns);
1154 if (ent->old || ent->rename)
1157 /* no ref on policy only use inside lock */
1159 policy = __lookup_parent(ns, ent->new->base.hname);
1161 /* first check for parent in the load set */
1162 p = __list_lookup_parent(&lh, ent->new);
1165 * fill in missing parent with null
1166 * profile that doesn't have
1167 * permissions. This allows for
1168 * individual profile loading where
1169 * the child is loaded before the
1170 * parent, and outside of the current
1171 * atomic set. This unfortunately can
1172 * happen with some userspaces. The
1173 * null profile will be replaced once
1174 * the parent is loaded.
1176 policy = __create_missing_ancestors(ns,
1177 ent->new->base.hname,
1181 info = "parent does not exist";
1186 if (!p && policy != &ns->base)
1187 /* released on profile replacement or free_profile */
1188 p = (struct aa_profile *) policy;
1189 rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
1192 /* create new fs entries for introspection if needed */
1193 if (!udata->dents[AAFS_LOADDATA_DIR] && aa_g_export_binary) {
1194 error = __aa_fs_create_rawdata(ns, udata);
1196 info = "failed to create raw_data dir and files";
1201 list_for_each_entry(ent, &lh, list) {
1203 struct dentry *parent;
1204 if (rcu_access_pointer(ent->new->parent)) {
1205 struct aa_profile *p;
1206 p = aa_deref_parent(ent->new);
1207 parent = prof_child_dir(p);
1209 parent = ns_subprofs_dir(ent->new->ns);
1210 error = __aafs_profile_mkdir(ent->new, parent);
1214 info = "failed to create";
1219 /* Done with checks that may fail - do actual replacement */
1220 __aa_bump_ns_revision(ns);
1221 if (aa_g_export_binary)
1222 __aa_loaddata_update(udata, ns->revision);
1223 list_for_each_entry_safe(ent, tmp, &lh, list) {
1224 list_del_init(&ent->list);
1225 op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
1227 if (ent->old && ent->old->rawdata == ent->new->rawdata &&
1228 ent->new->rawdata) {
1229 /* dedup actual profile replacement */
1230 audit_policy(label, op, ns_name, ent->new->base.hname,
1231 "same as current profile, skipping",
1233 /* break refcount cycle with proxy. */
1234 aa_put_proxy(ent->new->label.proxy);
1235 ent->new->label.proxy = NULL;
1240 * TODO: finer dedup based on profile range in data. Load set
1241 * can differ but profile may remain unchanged
1243 audit_policy(label, op, ns_name, ent->new->base.hname, NULL,
1247 share_name(ent->old, ent->new);
1248 __replace_profile(ent->old, ent->new);
1250 struct list_head *lh;
1252 if (rcu_access_pointer(ent->new->parent)) {
1253 struct aa_profile *parent;
1255 parent = update_to_newest_parent(ent->new);
1256 lh = &parent->base.profiles;
1258 lh = &ns->base.profiles;
1259 __add_profile(lh, ent->new);
1262 aa_load_ent_free(ent);
1264 __aa_labelset_update_subtree(ns);
1265 mutex_unlock(&ns->lock);
1269 aa_put_loaddata(udata);
1277 mutex_unlock(&ns->lock);
1279 /* audit cause of failure */
1280 op = (ent && !ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
1282 audit_policy(label, op, ns_name, ent ? ent->new->base.hname : NULL,
1284 /* audit status that rest of profiles in the atomic set failed too */
1285 info = "valid profile in failed atomic policy load";
1286 list_for_each_entry(tmp, &lh, list) {
1288 info = "unchecked profile in failed atomic policy load";
1289 /* skip entry that caused failure */
1292 op = (!tmp->old) ? OP_PROF_LOAD : OP_PROF_REPL;
1293 audit_policy(label, op, ns_name, tmp->new->base.hname, info,
1296 list_for_each_entry_safe(ent, tmp, &lh, list) {
1297 list_del_init(&ent->list);
1298 aa_load_ent_free(ent);
1305 * aa_remove_profiles - remove profile(s) from the system
1306 * @policy_ns: namespace the remove is being done from
1307 * @subj: label attempting to remove policy
1308 * @fqname: name of the profile or namespace to remove (NOT NULL)
1309 * @size: size of the name
1311 * Remove a profile or sub namespace from the current namespace, so that
1312 * they can not be found anymore and mark them as replaced by unconfined
1314 * NOTE: removing confinement does not restore rlimits to preconfinement values
1316 * Returns: size of data consume else error code if fails
1318 ssize_t aa_remove_profiles(struct aa_ns *policy_ns, struct aa_label *subj,
1319 char *fqname, size_t size)
1321 struct aa_ns *ns = NULL;
1322 struct aa_profile *profile = NULL;
1323 const char *name = fqname, *info = NULL;
1324 const char *ns_name = NULL;
1328 info = "no profile specified";
1333 if (fqname[0] == ':') {
1336 name = aa_splitn_fqname(fqname, size, &ns_name, &ns_len);
1337 /* released below */
1338 ns = aa_lookupn_ns(policy_ns ? policy_ns : labels_ns(subj),
1341 info = "namespace does not exist";
1346 /* released below */
1347 ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(subj));
1350 /* remove namespace - can only happen if fqname[0] == ':' */
1351 mutex_lock_nested(&ns->parent->lock, ns->parent->level);
1352 __aa_bump_ns_revision(ns);
1354 mutex_unlock(&ns->parent->lock);
1356 /* remove profile */
1357 mutex_lock_nested(&ns->lock, ns->level);
1358 profile = aa_get_profile(__lookup_profile(&ns->base, name));
1361 info = "profile does not exist";
1364 name = profile->base.hname;
1365 __aa_bump_ns_revision(ns);
1366 __remove_profile(profile);
1367 __aa_labelset_update_subtree(ns);
1368 mutex_unlock(&ns->lock);
1371 /* don't fail removal if audit fails */
1372 (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info,
1375 aa_put_profile(profile);
1379 mutex_unlock(&ns->lock);
1383 (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info,