netdev - Re: [PATCH net-next] net: tcp_probe: adapt tbuf size for recent changes

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Message-Id: <20130904.005503.542805290897839216.davem@davemloft.net>
Date:	Wed, 04 Sep 2013 00:55:03 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	dborkman@...hat.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: tcp_probe: adapt tbuf size for recent
 changes

From: Daniel Borkmann <dborkman@...hat.com>
Date: Tue,  3 Sep 2013 18:24:02 +0200

> With recent changes in tcp_probe module (e.g. f925d0a62d ("net: tcp_probe:
> add IPv6 support")) we also need to take into account that tbuf needs to
> be updated as format string will be further expanded. tbuf sits on the stack
> in tcpprobe_read() function that is invoked when user space reads procfs
> file /proc/net/tcpprobe, hence not fast path as in jtcp_rcv_established().
> Having a size similarly as in sctp_probe module of 256 bytes is fully
> sufficient for that, we need theoretical maximum of 252 bytes otherwise we
> could get truncated.
> 
> Signed-off-by: Daniel Borkmann <dborkman@...hat.com>

Applied.
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