TOMOYO: Pass "struct list_head" rather than "void *".

Pass "struct list_head" to tomoyo_add_to_gc() and bring
list_del_rcu() to tomoyo_add_to_gc().
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

security/tomoyo/gc.c

@@ -33,13 +33,13 @@ enum tomoyo_policy_id {
 struct tomoyo_gc_entry {
 	struct list_head list;
 	int type;
-	void *element;
+	struct list_head *element;
 };
 static LIST_HEAD(tomoyo_gc_queue);
 static DEFINE_MUTEX(tomoyo_gc_mutex);
 
 /* Caller holds tomoyo_policy_lock mutex. */
-static bool tomoyo_add_to_gc(const int type, void *element)
+static bool tomoyo_add_to_gc(const int type, struct list_head *element)
 {
 	struct tomoyo_gc_entry *entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
 	if (!entry)
@@ -47,57 +47,74 @@ static bool tomoyo_add_to_gc(const int type, void *element)
 	entry->type = type;
 	entry->element = element;
 	list_add(&entry->list, &tomoyo_gc_queue);
+	list_del_rcu(element);
 	return true;
 }
 
-static void tomoyo_del_allow_read
-(struct tomoyo_globally_readable_file_entry *ptr)
+static void tomoyo_del_allow_read(struct list_head *element)
 {
+	struct tomoyo_globally_readable_file_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->filename);
 }
 
-static void tomoyo_del_file_pattern(struct tomoyo_pattern_entry *ptr)
+static void tomoyo_del_file_pattern(struct list_head *element)
 {
+	struct tomoyo_pattern_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->pattern);
 }
 
-static void tomoyo_del_no_rewrite(struct tomoyo_no_rewrite_entry *ptr)
+static void tomoyo_del_no_rewrite(struct list_head *element)
 {
+	struct tomoyo_no_rewrite_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->pattern);
 }
 
-static void tomoyo_del_domain_initializer
-(struct tomoyo_domain_initializer_entry *ptr)
+static void tomoyo_del_domain_initializer(struct list_head *element)
 {
+	struct tomoyo_domain_initializer_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->domainname);
 	tomoyo_put_name(ptr->program);
 }
 
-static void tomoyo_del_domain_keeper(struct tomoyo_domain_keeper_entry *ptr)
+static void tomoyo_del_domain_keeper(struct list_head *element)
 {
+	struct tomoyo_domain_keeper_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->domainname);
 	tomoyo_put_name(ptr->program);
 }
 
-static void tomoyo_del_aggregator(struct tomoyo_aggregator_entry *ptr)
+static void tomoyo_del_aggregator(struct list_head *element)
 {
+	struct tomoyo_aggregator_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->original_name);
 	tomoyo_put_name(ptr->aggregated_name);
 }
 
-static void tomoyo_del_alias(struct tomoyo_alias_entry *ptr)
+static void tomoyo_del_alias(struct list_head *element)
 {
+	struct tomoyo_alias_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->original_name);
 	tomoyo_put_name(ptr->aliased_name);
 }
 
-static void tomoyo_del_manager(struct tomoyo_policy_manager_entry *ptr)
+static void tomoyo_del_manager(struct list_head *element)
 {
+	struct tomoyo_policy_manager_entry *ptr =
+		container_of(element, typeof(*ptr), head.list);
 	tomoyo_put_name(ptr->manager);
 }
 
-static void tomoyo_del_acl(struct tomoyo_acl_info *acl)
+static void tomoyo_del_acl(struct list_head *element)
 {
+	struct tomoyo_acl_info *acl =
+		container_of(element, typeof(*acl), list);
 	switch (acl->type) {
 	case TOMOYO_TYPE_PATH_ACL:
 		{
@@ -142,14 +159,13 @@ static void tomoyo_del_acl(struct tomoyo_acl_info *acl)
 			tomoyo_put_number_union(&entry->flags);
 		}
 		break;
-	default:
-		printk(KERN_WARNING "Unknown type\n");
-		break;
 	}
 }
 
-static bool tomoyo_del_domain(struct tomoyo_domain_info *domain)
+static bool tomoyo_del_domain(struct list_head *element)
 {
+	struct tomoyo_domain_info *domain =
+		container_of(element, typeof(*domain), list);
 	struct tomoyo_acl_info *acl;
 	struct tomoyo_acl_info *tmp;
 	/*
@@ -177,7 +193,7 @@ static bool tomoyo_del_domain(struct tomoyo_domain_info *domain)
 	if (atomic_read(&domain->users))
 		return false;
 	list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) {
-		tomoyo_del_acl(acl);
+		tomoyo_del_acl(&acl->list);
 		tomoyo_memory_free(acl);
 	}
 	tomoyo_put_name(domain->domainname);
@@ -185,28 +201,36 @@ static bool tomoyo_del_domain(struct tomoyo_domain_info *domain)
 }
 
 
-static void tomoyo_del_name(const struct tomoyo_name_entry *ptr)
+static void tomoyo_del_name(struct list_head *element)
 {
+	const struct tomoyo_name_entry *ptr =
+		container_of(element, typeof(*ptr), list);
 }
 
-static void tomoyo_del_path_group_member(struct tomoyo_path_group_member
-					 *member)
+static void tomoyo_del_path_group_member(struct list_head *element)
 {
+	struct tomoyo_path_group_member *member =
+		container_of(element, typeof(*member), head.list);
 	tomoyo_put_name(member->member_name);
 }
 
-static void tomoyo_del_path_group(struct tomoyo_path_group *group)
+static void tomoyo_del_path_group(struct list_head *element)
 {
+	struct tomoyo_path_group *group =
+		container_of(element, typeof(*group), list);
 	tomoyo_put_name(group->group_name);
 }
 
-static void tomoyo_del_number_group_member(struct tomoyo_number_group_member
-					   *member)
+static void tomoyo_del_number_group_member(struct list_head *element)
 {
+	struct tomoyo_number_group_member *member =
+		container_of(element, typeof(*member), head.list);
 }
 
-static void tomoyo_del_number_group(struct tomoyo_number_group *group)
+static void tomoyo_del_number_group(struct list_head *element)
 {
+	struct tomoyo_number_group *group =
+		container_of(element, typeof(*group), list);
 	tomoyo_put_name(group->group_name);
 }
 
@@ -229,7 +253,6 @@ static bool tomoyo_collect_member(struct list_head *member_list, int id)
 			continue;
 		if (!tomoyo_add_to_gc(id, &member->list))
 			return false;
-		list_del_rcu(&member->list);
 	}
         return true;
 }
@@ -242,7 +265,6 @@ static bool tomoyo_collect_acl(struct tomoyo_domain_info *domain)
 			continue;
 		if (!tomoyo_add_to_gc(TOMOYO_ID_ACL, &acl->list))
 			return false;
-		list_del_rcu(&acl->list);
 	}
 	return true;
 }
@@ -269,9 +291,7 @@ static void tomoyo_collect_entry(void)
 			 * refer this domain after successful execve().
 			 * We recheck domain->users after SRCU synchronization.
 			 */
-			if (tomoyo_add_to_gc(TOMOYO_ID_DOMAIN, domain))
-				list_del_rcu(&domain->list);
-			else
+			if (!tomoyo_add_to_gc(TOMOYO_ID_DOMAIN, &domain->list))
 				goto unlock;
 		}
 	}
@@ -280,9 +300,7 @@ static void tomoyo_collect_entry(void)
 		list_for_each_entry_rcu(ptr, &tomoyo_name_list[i], list) {
 			if (atomic_read(&ptr->users))
 				continue;
-			if (tomoyo_add_to_gc(TOMOYO_ID_NAME, ptr))
-				list_del_rcu(&ptr->list);
-			else
+			if (!tomoyo_add_to_gc(TOMOYO_ID_NAME, &ptr->list))
 				goto unlock;
 		}
 	}
@@ -294,9 +312,8 @@ static void tomoyo_collect_entry(void)
 			if (!list_empty(&group->member_list) ||
 			    atomic_read(&group->users))
 				continue;
-			if (tomoyo_add_to_gc(TOMOYO_ID_PATH_GROUP, group))
-				list_del_rcu(&group->list);
-			else
+			if (!tomoyo_add_to_gc(TOMOYO_ID_PATH_GROUP,
+					      &group->list))
 				goto unlock;
 		}
 	}
@@ -309,9 +326,8 @@ static void tomoyo_collect_entry(void)
 			if (!list_empty(&group->member_list) ||
 			    atomic_read(&group->users))
 				continue;
-			if (tomoyo_add_to_gc(TOMOYO_ID_NUMBER_GROUP, group))
-				list_del_rcu(&group->list);
-			else
+			if (!tomoyo_add_to_gc(TOMOYO_ID_NUMBER_GROUP,
+					      &group->list))
 				goto unlock;
 		}
 	}
@@ -325,58 +341,56 @@ static void tomoyo_kfree_entry(void)
 	struct tomoyo_gc_entry *tmp;
 
 	list_for_each_entry_safe(p, tmp, &tomoyo_gc_queue, list) {
+		struct list_head *element = p->element;
 		switch (p->type) {
 		case TOMOYO_ID_DOMAIN_INITIALIZER:
-			tomoyo_del_domain_initializer(p->element);
+			tomoyo_del_domain_initializer(element);
 			break;
 		case TOMOYO_ID_DOMAIN_KEEPER:
-			tomoyo_del_domain_keeper(p->element);
+			tomoyo_del_domain_keeper(element);
 			break;
 		case TOMOYO_ID_AGGREGATOR:
-			tomoyo_del_aggregator(p->element);
+			tomoyo_del_aggregator(element);
 			break;
 		case TOMOYO_ID_ALIAS:
-			tomoyo_del_alias(p->element);
+			tomoyo_del_alias(element);
 			break;
 		case TOMOYO_ID_GLOBALLY_READABLE:
-			tomoyo_del_allow_read(p->element);
+			tomoyo_del_allow_read(element);
 			break;
 		case TOMOYO_ID_PATTERN:
-			tomoyo_del_file_pattern(p->element);
+			tomoyo_del_file_pattern(element);
 			break;
 		case TOMOYO_ID_NO_REWRITE:
-			tomoyo_del_no_rewrite(p->element);
+			tomoyo_del_no_rewrite(element);
 			break;
 		case TOMOYO_ID_MANAGER:
-			tomoyo_del_manager(p->element);
+			tomoyo_del_manager(element);
 			break;
 		case TOMOYO_ID_NAME:
-			tomoyo_del_name(p->element);
+			tomoyo_del_name(element);
 			break;
 		case TOMOYO_ID_ACL:
-			tomoyo_del_acl(p->element);
+			tomoyo_del_acl(element);
 			break;
 		case TOMOYO_ID_DOMAIN:
-			if (!tomoyo_del_domain(p->element))
+			if (!tomoyo_del_domain(element))
 				continue;
 			break;
 		case TOMOYO_ID_PATH_GROUP_MEMBER:
-			tomoyo_del_path_group_member(p->element);
+			tomoyo_del_path_group_member(element);
 			break;
 		case TOMOYO_ID_PATH_GROUP:
-			tomoyo_del_path_group(p->element);
+			tomoyo_del_path_group(element);
 			break;
 		case TOMOYO_ID_NUMBER_GROUP_MEMBER:
-			tomoyo_del_number_group_member(p->element);
+			tomoyo_del_number_group_member(element);
 			break;
 		case TOMOYO_ID_NUMBER_GROUP:
-			tomoyo_del_number_group(p->element);
-			break;
-		default:
-			printk(KERN_WARNING "Unknown type\n");
+			tomoyo_del_number_group(element);
 			break;
 		}
-		tomoyo_memory_free(p->element);
+		tomoyo_memory_free(element);
 		list_del(&p->list);
 		kfree(p);
 	}