linux-kernel - Re: [PATCH] tcp: sysctl to disable TCP simultaneous connect

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Message-ID: <87r4ki6oi1.fsf@xmission.com>
Date:	Thu, 14 Feb 2013 23:10:46 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Kees Cook <keescook@...omium.org>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Neil Horman <nhorman@...driver.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Shan Wei <davidshan@...cent.com>,
	"linux-doc\@vger.kernel.org" <linux-doc@...r.kernel.org>,
	netdev@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: Re: [PATCH] tcp: sysctl to disable TCP simultaneous connect

Kees Cook <keescook@...omium.org> writes:

> On Thu, Feb 14, 2013 at 9:30 PM, Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
>> Kees Cook <keescook@...omium.org> writes:
>>
>>> The patch would not break it -- it defaults the sysctl to staying enabled.
>>>
>>> If you mean the documentation should be updated, sure, that's easy to do.
>>>
>>> David: I know you aren't a fan of this patch, but I'd like to try to
>>> convince you. :) This leaves the feature enabled and add a toggle for
>>> systems (like Chrome OS) that don't want to risk this DoS at all.
>>> There are so very many other toggle, I don't see why this one would be
>>> a problem to add.
>>
>> Chrome OS has no plans to implement webrtc?  Last I had read that
>> support had been added to the release versions of Chrome, and was in the
>> development builds of firefox.  I really don't belive that there are
>> many systems that don't intend to run a web browser.
>
> I haven't looked at the internals of webrtc. Are you implying some
> feature in it relies on the TCP simultaneous connect?

I am saying that yes.

webrtc is built on ICE (interactivity connectivity establishment).  ICE
support for TCP (RFC6544) uses TCP simultaneous connect.  webrtc
supports tcp connections.

Eric

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