netdev - Re: [PATCH v5 0/6] Add eBPF hooks for cgroups

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Message-ID: <0e64ec7a-e75f-620a-d7b7-e646913c3514@zonque.org>
Date:   Thu, 15 Sep 2016 10:11:50 +0200
From:   Daniel Mack <daniel@...que.org>
To:     Vincent Bernat <bernat@...fy.cx>
Cc:     htejun@...com, daniel@...earbox.net, ast@...com,
        davem@...emloft.net, kafai@...com, fw@...len.de,
        pablo@...filter.org, harald@...hat.com, netdev@...r.kernel.org,
        sargun@...gun.me, cgroups@...r.kernel.org
Subject: Re: [PATCH v5 0/6] Add eBPF hooks for cgroups

On 09/15/2016 08:36 AM, Vincent Bernat wrote:
>  ❦ 12 septembre 2016 18:12 CEST, Daniel Mack <daniel@...que.org> :
> 
>> * The sample program learned to support both ingress and egress, and
>>   can now optionally make the eBPF program drop packets by making it
>>   return 0.
> 
> Ability to lock the eBPF program to avoid modification from a later
> program or in a subcgroup would be pretty interesting from a security
> perspective.

For now, you can achieve that by dropping CAP_NET_ADMIN after installing
a program between fork and exec. I think that should suffice for a first
version. Flags to further limit that could be be added later.


Thanks,
Daniel