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SUNRPC: Ensure we always close the socket after a connection shuts down

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Ensure that we release the TCP socket once it is in the TCP_CLOSE or
TCP_TIME_WAIT state (and only then) so that we don't confuse rkhunter
and its ilk.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2018-02-05 10:20:06 -05:00
parent e231c6879c
commit 9b30889c54
1 changed files with 10 additions and 13 deletions
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23
net/sunrpc/xprtsock.c
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@ -807,13 +807,6 @@ static void xs_sock_reset_connection_flags(struct rpc_xprt *xprt)
smp_mb__after_atomic();
}
static void xs_sock_mark_closed(struct rpc_xprt *xprt)
{
xs_sock_reset_connection_flags(xprt);
/* Mark transport as closed and wake up all pending tasks */
xprt_disconnect_done(xprt);
}
/**
* xs_error_report - callback to handle TCP socket state errors
* @sk: socket
@ -833,9 +826,6 @@ static void xs_error_report(struct sock *sk)
err = -sk->sk_err;
if (err == 0)
goto out;
/* Is this a reset event? */
if (sk->sk_state == TCP_CLOSE)
xs_sock_mark_closed(xprt);
dprintk("RPC: xs_error_report client %p, error=%d...\n",
xprt, -err);
trace_rpc_socket_error(xprt, sk->sk_socket, err);
@ -1655,9 +1645,11 @@ static void xs_tcp_state_change(struct sock *sk)
if (test_and_clear_bit(XPRT_SOCK_CONNECTING,
&transport->sock_state))
xprt_clear_connecting(xprt);
clear_bit(XPRT_CLOSING, &xprt->state);
if (sk->sk_err)
xprt_wake_pending_tasks(xprt, -sk->sk_err);
xs_sock_mark_closed(xprt);
/* Trigger the socket release */
xs_tcp_force_close(xprt);
}
out:
read_unlock_bh(&sk->sk_callback_lock);
@ -2265,15 +2257,20 @@ static void xs_tcp_shutdown(struct rpc_xprt *xprt)
{
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
struct socket *sock = transport->sock;
int skst = transport->inet ? transport->inet->sk_state : TCP_CLOSE;
if (sock == NULL)
return;
if (xprt_connected(xprt)) {
switch (skst) {
default:
kernel_sock_shutdown(sock, SHUT_RDWR);
trace_rpc_socket_shutdown(xprt, sock);
} else
break;
case TCP_CLOSE:
case TCP_TIME_WAIT:
xs_reset_transport(transport);
}
}
static void xs_tcp_set_socket_timeouts(struct rpc_xprt *xprt,
struct socket *sock)