netdev - Re: [PATCH net] sock: fix sendmmsg for partial sendmsg

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Date:   Wed, 09 Nov 2016 13:18:45 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     soheil.kdev@...il.com
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, willemb@...gle.com,
        ncardwell@...gle.com, soheil@...gle.com
Subject: Re: [PATCH net] sock: fix sendmmsg for partial sendmsg

From: Soheil Hassas Yeganeh <soheil.kdev@...il.com>
Date: Fri,  4 Nov 2016 15:36:49 -0400

> From: Soheil Hassas Yeganeh <soheil@...gle.com>
> 
> Do not send the next message in sendmmsg for partial sendmsg
> invocations.
> 
> sendmmsg assumes that it can continue sending the next message
> when the return value of the individual sendmsg invocations
> is positive. It results in corrupting the data for TCP,
> SCTP, and UNIX streams.
> 
> For example, sendmmsg([["abcd"], ["efgh"]]) can result in a stream
> of "aefgh" if the first sendmsg invocation sends only the first
> byte while the second sendmsg goes through.
> 
> Datagram sockets either send the entire datagram or fail, so
> this patch affects only sockets of type SOCK_STREAM and
> SOCK_SEQPACKET.
> 
> Fixes: 228e548e6020 ("net: Add sendmmsg socket system call")
> Signed-off-by: Soheil Hassas Yeganeh <soheil@...gle.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>
> Signed-off-by: Neal Cardwell <ncardwell@...gle.com>

Applied and queued up for -stable, thanks.