Kernel Version: 4.18.5 Problem Description:
We found several leaking path or inconsistency LSM design issue in fs/net. Currently we can only observe sock creation from kernel and all bind/listen/connect are not sent to LSM. So, we think that those net/socket related stuff should all go through LSM check and being audited even it is not a user thread or process. Here’s an example where we have a check: in fs/ocfs2/cluster/tcp.c:2035 o2net_open_listening_sock() a sock is created using sock_create(), where a LSM check security_socket_create is called(net/socket.c:1242) And where we don’t have a check fs/ocfs2/cluster/tcp.c:2052 bind fs/ocfs2/cluster/tcp.c:2059 listen fs/dlm/lowcomms.c:1264 bind fs/dlm/lowcomms.c:1278 listen fs/dlm/lowcomms.c:1354 listen several places that use kernel_bind/kernel_listen/kernel_connect net/socket.c:3231 kernel_bind net/socket.c:3237 kernel_listen net/socket.c:3286 kernel_connect - Tong
