netdev - Re: [PATCH net] kcm: do not attach PF

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Message-Id: <20170830.155538.944885056033122938.davem@davemloft.net>
Date:   Wed, 30 Aug 2017 15:55:38 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, tom@...ntonium.net
Subject: Re: [PATCH net] kcm: do not attach PF_KCM sockets to avoid deadlock

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 30 Aug 2017 09:29:31 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> syzkaller had no problem to trigger a deadlock, attaching a KCM socket
> to another one (or itself). (original syzkaller report was a very
> confusing lockdep splat during a sendmsg())
> 
> It seems KCM claims to only support TCP, but no enforcement is done,
> so we might need to add additional checks.
> 
> Fixes: ab7ac4eb9832 ("kcm: Kernel Connection Multiplexor module")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>

Applied and queued up for -stable, thanks.