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

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CBE9A61@AcuExch.aculab.com>
Date:	Wed, 9 Dec 2015 15:49:27 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Eric Dumazet' <eric.dumazet@...il.com>,
	Eric Dumazet <edumazet@...gle.com>
CC:	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

> 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.

	David