From 0f44e4d976f96c6439da0d6717238efa4b91196e Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 26 Jun 2019 21:02:32 +0100 Subject: keys: Move the user and user-session keyrings to the user_namespace Move the user and user-session keyrings to the user_namespace struct rather than pinning them from the user_struct struct. This prevents these keyrings from propagating across user-namespaces boundaries with regard to the KEY_SPEC_* flags, thereby making them more useful in a containerised environment. The issue is that a single user_struct may be represent UIDs in several different namespaces. The way the patch does this is by attaching a 'register keyring' in each user_namespace and then sticking the user and user-session keyrings into that. It can then be searched to retrieve them. Signed-off-by: David Howells cc: Jann Horn --- security/keys/keyring.c | 1 + 1 file changed, 1 insertion(+) (limited to 'security/keys/keyring.c') diff --git a/security/keys/keyring.c b/security/keys/keyring.c index fe851292509e..3663e5168583 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -62,6 +62,7 @@ void key_free_user_ns(struct user_namespace *ns) list_del_init(&ns->keyring_name_list); write_unlock(&keyring_name_lock); + key_put(ns->user_keyring_register); #ifdef CONFIG_PERSISTENT_KEYRINGS key_put(ns->persistent_keyring_register); #endif -- cgit v1.2.3-59-g8ed1b