Re: [PATCH] linux 2.9.10-rc1: Fix oops in unix_dgram_sendmsg when using SELinux and SOCK_SEQPACKET

Chris Wright wrote:

Why not make a unix_seq_sendmsg, which is a very small wrapper?
e.g.
static int unix_seq_sendmsg(struct kiocb *kiocb, struct socket *sock,
			    struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;

	if (sk->sk_type == SOCK_SEQPACKET && sk->sk_state != TCP_ESTABLISHED)
		return -ENOTCONN;
	if (msg->msg_name || msg->msg_namelen)
		return -EINVAL;
	return unix_dgram_sendmsg(kiocb, sock, msg, len);
}


-chris

Taking this idea further, couldn't we split unix_dgram_sendmsg into 2 
functions, do_unix_dgram_sendmsg and do_unix_connectionless_sendmsg (and 
similarly for unix_stream_sendmsg), then all we'd need is:

<pseudocode>
static int do_unix_dgram_sendmsg(...);
static int do_unix_stream_sendmsg(...);
static int do_unix_connectionless_sendmsg(...);
static int do_unix_connectional_sendmsg(...);

static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock,
			      struct msghdr *msg, size_t len)
{
	return do_unix_connectionless_sendmsg(kiocb, sock, msg, len,
					      do_unix_dgram_sendmsg);
}
static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
			       struct msghdr *msg, size_t len)
{
	return do_unix_connectional_sendmsg(kiocb, sock, msg, len,
					    do_unix_stream_sendmsg);
}
static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock,
				  struct msghdr *msg, size_t len)
{
	return do_unix_connectional_sendmsg(kiocb, sock, msg, len,
					    do_unix_dgram_sendmsg);
}
</pseudocode>

What do we think?

Ross