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

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Message-ID: <56687EBB.5040108@iogearbox.net>
Date:	Wed, 09 Dec 2015 20:19:23 +0100
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	David Laight <David.Laight@...LAB.COM>,
	'Eric Dumazet' <eric.dumazet@...il.com>
CC:	Eric Dumazet <edumazet@...gle.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 12/09/2015 06:11 PM, Marcelo Ricardo Leitner wrote:
> Em 09-12-2015 14:31, David Laight escreveu:
>> From: Eric Dumazet [mailto:eric.dumazet@...il.com]
>>> Sent: 09 December 2015 16:00
>>> 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.
>>
>> If they require hostile programs I'm not worried.
>
> Not really "require", but "allow", as in: allowing third-party applications to run on it.

Yeah :/ given distros enable almost everything anyway, the first unpriv'ed
socket(..., IPPROTO_SCTP) call auto-loads SCTP module. But to be honest, I'd
be surprised if Cloud providers allow for this. Most of this might only run
on dedicated boxes with telco appliances.
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