netdev - Re: [PATCH stable 4.4 0/9] fix SegmentSmack in stable branch (CVE-2018-5390)

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Date:   Thu, 16 Aug 2018 09:23:49 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     maowenan <maowenan@...wei.com>
Cc:     dwmw2@...radead.org, gregkh@...ux-foundation.org,
        netdev@...r.kernel.org, eric.dumazet@...il.com,
        edumazet@...gle.com, davem@...emloft.net, ycheng@...gle.com,
        jdw@...zon.de, stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH stable 4.4 0/9] fix SegmentSmack in stable branch
 (CVE-2018-5390)

On Thu, Aug 16, 2018 at 03:19:12PM +0800, maowenan wrote:
> On 2018/8/16 14:52, Michal Kubecek wrote:
> > 
> > My point is that backporting all this into stable 4.4 is quite intrusive
> > so that if we can achieve similar results with a simple fix of an
> > obvious omission, it would be preferrable.
> 
> There are five patches in mainline to fix this CVE, only two patches
> have no effect on stable 4.4, the important reason is 4.4 use simple
> queue but mainline use RB tree.
> 
> I have tried my best to use easy way to fix this with dropping packets
> 12.5%(or other value) based on simple queue, but the result is not
> very well, so the RB tree is needed and tested result is my desire.
> 
> If we only back port two patches but they don't fix the issue, I think
> they don't make any sense.

There is an obvious omission in one of the two patches and Takashi's
patch fixes it. If his follow-up fix (applied on top of what is in
stable 4.4 now) addresses the problem, I would certainly prefer using it
over backporting the whole series.

Michal Kubecek