The patch below does not apply to the 4.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

Thanks, Sasha

------------------ original commit in Linus's tree ------------------

From 1f935e8e72ec28dddb2dc0650b3b6626a293d94b Mon Sep 17 00:00:00 2001

From: David Brazdil dbrazdil@google.com Date: Fri, 19 Mar 2021 13:05:41 +0000 Subject: [PATCH] selinux: vsock: Set SID for socket returned by accept()

For AF_VSOCK, accept() currently returns sockets that are unlabelled. Other socket families derive the child's SID from the SID of the parent and the SID of the incoming packet. This is typically done as the connected socket is placed in the queue that accept() removes from.

Reuse the existing 'security_sk_clone' hook to copy the SID from the parent (server) socket to the child. There is no packet SID in this case.

Fixes: d021c344051a ("VSOCK: Introduce VM Sockets") Signed-off-by: David Brazdil dbrazdil@google.com Signed-off-by: David S. Miller davem@davemloft.net --- net/vmw_vsock/af_vsock.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 5546710d8ac1..bc7fb9bf3351 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -755,6 +755,7 @@ static struct sock *__vsock_create(struct net *net, vsk->buffer_size = psk->buffer_size; vsk->buffer_min_size = psk->buffer_min_size; vsk->buffer_max_size = psk->buffer_max_size; + security_sk_clone(parent, sk); } else { vsk->trusted = ns_capable_noaudit(&init_user_ns, CAP_NET_ADMIN); vsk->owner = get_current_cred();