From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: Possible bugfix for AF_UNIX, SOCK_SEQPACKET sockets
Date: Wed, 15 Feb 2012 14:55:11 -0500 (EST)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Wed, 15 Feb 2012 13:42:07 +0100

> @@ -1824,7 +1824,7 @@ static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock,
>  		if (UNIXCB(skb).fp)
>  			siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp);
>  	}
> -	err = size;
> +	err = (flags & MSG_TRUNC) ? skb->len : size;
>  
>  	scm_recv(sock, msg, siocb->scm, flags);

I'm ok with this, but if it is found to break even one userland application
I'm reverting with impunity.