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-rw-r--r--security/apparmor/policy.c68
1 files changed, 27 insertions, 41 deletions
diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c
index 41b8f275c626..0ceee967434c 100644
--- a/security/apparmor/policy.c
+++ b/security/apparmor/policy.c
@@ -141,7 +141,6 @@ static bool policy_init(struct aa_policy *policy, const char *prefix,
policy->name = (char *)hname_tail(policy->hname);
INIT_LIST_HEAD(&policy->list);
INIT_LIST_HEAD(&policy->profiles);
- kref_init(&policy->count);
return 1;
}
@@ -292,14 +291,10 @@ static struct aa_namespace *alloc_namespace(const char *prefix,
goto fail_unconfined;
ns->unconfined->flags = PFLAG_UNCONFINED | PFLAG_IX_ON_NAME_ERROR |
- PFLAG_IMMUTABLE;
+ PFLAG_IMMUTABLE | PFLAG_NS_COUNT;
- /*
- * released by free_namespace, however __remove_namespace breaks
- * the cyclic references (ns->unconfined, and unconfined->ns) and
- * replaces with refs to parent namespace unconfined
- */
- ns->unconfined->ns = aa_get_namespace(ns);
+ /* ns and ns->unconfined share ns->unconfined refcount */
+ ns->unconfined->ns = ns;
atomic_set(&ns->uniq_null, 0);
@@ -312,6 +307,7 @@ fail_ns:
return NULL;
}
+static void free_profile(struct aa_profile *profile);
/**
* free_namespace - free a profile namespace
* @ns: the namespace to free (MAYBE NULL)
@@ -327,20 +323,33 @@ static void free_namespace(struct aa_namespace *ns)
policy_destroy(&ns->base);
aa_put_namespace(ns->parent);
- if (ns->unconfined && ns->unconfined->ns == ns)
- ns->unconfined->ns = NULL;
-
- aa_put_profile(ns->unconfined);
+ ns->unconfined->ns = NULL;
+ free_profile(ns->unconfined);
kzfree(ns);
}
/**
+ * aa_free_namespace_rcu - free aa_namespace by rcu
+ * @head: rcu_head callback for freeing of a profile (NOT NULL)
+ *
+ * rcu_head is to the unconfined profile associated with the namespace
+ */
+static void aa_free_namespace_rcu(struct rcu_head *head)
+{
+ struct aa_profile *p = container_of(head, struct aa_profile, base.rcu);
+ free_namespace(p->ns);
+}
+
+/**
* aa_free_namespace_kref - free aa_namespace by kref (see aa_put_namespace)
* @kr: kref callback for freeing of a namespace (NOT NULL)
+ *
+ * kref is to the unconfined profile associated with the namespace
*/
void aa_free_namespace_kref(struct kref *kref)
{
- free_namespace(container_of(kref, struct aa_namespace, base.count));
+ struct aa_profile *p = container_of(kref, struct aa_profile, count);
+ call_rcu(&p->base.rcu, aa_free_namespace_rcu);
}
/**
@@ -494,8 +503,6 @@ static void __ns_list_release(struct list_head *head);
*/
static void destroy_namespace(struct aa_namespace *ns)
{
- struct aa_profile *unconfined;
-
if (!ns)
return;
@@ -506,30 +513,11 @@ static void destroy_namespace(struct aa_namespace *ns)
/* release all sub namespaces */
__ns_list_release(&ns->sub_ns);
- unconfined = ns->unconfined;
- /*
- * break the ns, unconfined profile cyclic reference and forward
- * all new unconfined profiles requests to the parent namespace
- * This will result in all confined tasks that have a profile
- * being removed, inheriting the parent->unconfined profile.
- */
if (ns->parent)
- ns->unconfined = aa_get_profile(ns->parent->unconfined);
-
- /* release original ns->unconfined ref */
- aa_put_profile(unconfined);
-
+ __aa_update_replacedby(ns->unconfined, ns->parent->unconfined);
mutex_unlock(&ns->lock);
}
-static void aa_put_ns_rcu(struct rcu_head *head)
-{
- struct aa_namespace *ns = container_of(head, struct aa_namespace,
- base.rcu);
- /* release ns->base.list ref */
- aa_put_namespace(ns);
-}
-
/**
* __remove_namespace - remove a namespace and all its children
* @ns: namespace to be removed (NOT NULL)
@@ -540,10 +528,8 @@ static void __remove_namespace(struct aa_namespace *ns)
{
/* remove ns from namespace list */
list_del_rcu(&ns->base.list);
-
destroy_namespace(ns);
-
- call_rcu(&ns->base.rcu, aa_put_ns_rcu);
+ aa_put_namespace(ns);
}
/**
@@ -656,8 +642,7 @@ static void aa_free_profile_rcu(struct rcu_head *head)
*/
void aa_free_profile_kref(struct kref *kref)
{
- struct aa_profile *p = container_of(kref, struct aa_profile,
- base.count);
+ struct aa_profile *p = container_of(kref, struct aa_profile, count);
call_rcu(&p->base.rcu, aa_free_profile_rcu);
}
@@ -683,6 +668,7 @@ struct aa_profile *aa_alloc_profile(const char *hname)
if (!policy_init(&profile->base, NULL, hname))
goto fail;
+ kref_init(&profile->count);
/* refcount released by caller */
return profile;
@@ -884,7 +870,7 @@ struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *hname)
/* the unconfined profile is not in the regular profile list */
if (!profile && strcmp(hname, "unconfined") == 0)
- profile = aa_get_profile(ns->unconfined);
+ profile = aa_get_newest_profile(ns->unconfined);
/* refcount released by caller */
return profile;