From c7ff9cff70601ea19245d997bb977344663434c7 Mon Sep 17 00:00:00 2001 From: "Longpeng(Mike)" Date: Mon, 21 Jun 2021 14:26:01 +0800 Subject: vsock: notify server to shutdown when client has pending signal The client's sk_state will be set to TCP_ESTABLISHED if the server replay the client's connect request. However, if the client has pending signal, its sk_state will be set to TCP_CLOSE without notify the server, so the server will hold the corrupt connection. client server 1. sk_state=TCP_SYN_SENT | 2. call ->connect() | 3. wait reply | | 4. sk_state=TCP_ESTABLISHED | 5. insert to connected list | 6. reply to the client 7. sk_state=TCP_ESTABLISHED | 8. insert to connected list | 9. *signal pending* <--------------------- the user kill client 10. sk_state=TCP_CLOSE | client is exiting... | 11. call ->release() | virtio_transport_close if (!(sk->sk_state == TCP_ESTABLISHED || sk->sk_state == TCP_CLOSING)) return true; *return at here, the server cannot notice the connection is corrupt* So the client should notify the peer in this case. Cc: David S. Miller Cc: Jakub Kicinski Cc: Jorgen Hansen Cc: Norbert Slusarek Cc: Andra Paraschiv Cc: Colin Ian King Cc: David Brazdil Cc: Alexander Popov Suggested-by: Stefano Garzarella Link: https://lkml.org/lkml/2021/5/17/418 Signed-off-by: lixianming Signed-off-by: Longpeng(Mike) Reviewed-by: Stefano Garzarella Signed-off-by: David S. Miller --- net/vmw_vsock/af_vsock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/vmw_vsock') diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c index 92a72f0e0d94..ae11311807fd 100644 --- a/net/vmw_vsock/af_vsock.c +++ b/net/vmw_vsock/af_vsock.c @@ -1369,7 +1369,7 @@ static int vsock_stream_connect(struct socket *sock, struct sockaddr *addr, if (signal_pending(current)) { err = sock_intr_errno(timeout); - sk->sk_state = TCP_CLOSE; + sk->sk_state = sk->sk_state == TCP_ESTABLISHED ? TCP_CLOSING : TCP_CLOSE; sock->state = SS_UNCONNECTED; vsock_transport_cancel_pkt(vsk); goto out_wait; -- cgit v1.2.3-58-ga151