linux-kernel - Re: [PATCH net] ipv6: sctp: clone options to avoid use after free

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Message-ID: <1449676782.9768.9.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 09 Dec 2015 07:59:42 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	"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>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Vlad Yasevich <vyasevich@...il.com>,
	Neil Horman <nhorman@...driver.com>,
	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: [PATCH net] ipv6: sctp: clone options to avoid use after free

On Wed, 2015-12-09 at 15:49 +0000, David Laight wrote:
> > SCTP is lacking proper np->opt cloning at accept() time.
> > 
> > TCP and DCCP use ipv6_dup_options() helper, do the same in SCTP.
> > 
> > We might later factorize this code in a common helper to avoid
> > future mistakes.
> 
> I'm wondering what the real impact of this and the other recent
> SCTP bugs/patches is on real workloads?
> We have enough trouble getting our customers to use kernels
> later that the 2.6.18 based RHEL5 - without having to persuade
> them to use kernels that contain very recent fixes.

It all depends if your customers let (hostile ?) people run programs on
the boxes.

I wont run the program on my laptop just for the fun of making it crash,
but I guess Cloud providers might be worried, once exploits are public.


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