linux-kernel - Re: [PATCH] Add IPv6 support to TCP SYN cookies

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080205215216.GB24275@2ka.mipt.ru>
Date:	Wed, 6 Feb 2008 00:52:17 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Glenn Griffin <ggriffin.kernel@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add IPv6 support to TCP SYN cookies

Hi Alan.

On Tue, Feb 05, 2008 at 09:20:17PM +0000, Alan Cox (alan@...rguk.ukuu.org.uk) wrote:
> > Most (if not all) distributions have them enabled and window growing
> > works just fine. Actually I do not see any reason why connection
> > establishment handshake should prevent any run-time operations at all,
> > even if it was setup during handshake.
> 
> Syncookies are only triggered if the system is under a load where it
> would begin to lose connections otherwise. So they merely turn a DoS into
> a working if slightly slower setup (and > 64K windows don't matter for
> most normal users, especially on mobile devices).

SACK is actually a good idea for mobile devices, so preventing
syncookies from not getting into account some options (btw, does it work
with timestamps and PAWS?) is not a solution.

-- 
	Evgeniy Polyakov
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/