tmpfiles.d: Create /var/lib/containers

Create /var/lib/containers so that it exists with an appropriate mode. We want
0700 by default so that users on the host aren't able to call suid root
binaries in the container. This becomes a security issue if a user can enter a
container as root, create a suid root binary, and call that from the host.
(This assumes that containers are caged by mandatory access control or are
started as user).

diff --git a/tmpfiles.d/var.conf b/tmpfiles.d/var.conf
index 4b63e41..b4bf3bc 100644 (file)
--- a/tmpfiles.d/var.conf
+++ b/tmpfiles.d/var.conf
@@ -18,4 +18,6 @@ f /var/log/btmp 0600 root utmp -
 d /var/cache 0755 - - -
 
 d /var/lib 0755 - - -
+d /var/lib/containers 0700 - - -
+
 d /var/spool 0755 - - -