netdev - Re: Backport bpf: try harder on clones when writing into skb? [Commit: 3697649ff29e0f647565eed04b27a7779c646a22]

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Message-ID: <577CBD89.4060303@iogearbox.net>
Date:	Wed, 06 Jul 2016 10:12:57 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	David Miller <davem@...emloft.net>, alexei.starovoitov@...il.com
CC:	sargun@...gun.me, netdev@...r.kernel.org
Subject: Re: Backport bpf: try harder on clones when writing into skb? [Commit:
 3697649ff29e0f647565eed04b27a7779c646a22]

On 07/06/2016 05:47 AM, David Miller wrote:
> From: Alexei Starovoitov <alexei.starovoitov@...il.com>
> Date: Tue, 5 Jul 2016 19:16:51 -0700
>
>> On Tue, Jul 05, 2016 at 08:35:18AM -0700, Sargun Dhillon wrote:
>>> Does it make sense to backport
>>> 3697649ff29e0f647565eed04b27a7779c646a22 from 4.6 to the longterm
>>> (4.4) release? I can trivially recreate the issue represented by
>>> 3697649ff29e0f647565eed04b27a7779c646a22 by attaching a eBPF filter
>>> that clones an ingress ICMP packet, and then tries to set the
>>> destination MAC address.
>>>
>>> It seems like the patch applies cleanly to 4.4. I cherry-picked it,
>>> and rebuilt my kernel, and at least in the trivial test case passes.
>>
>> Makes sense to me, especially since it's lts.
>> Daniel, thoughts?
>
> I'll queued this up for 4.4 -stable.

Sounds good, thanks!