netdev - Re: [PATCH v2 bpf-next 2/3] bpf: implement CAP

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Message-ID: <59ac111e-7ce7-5e00-32c9-9b55482fe701@6wind.com>
Date:   Fri, 30 Aug 2019 17:19:02 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     Alexei Starovoitov <ast@...nel.org>, luto@...capital.net,
        davem@...emloft.net, peterz@...radead.org, rostedt@...dmis.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org, kernel-team@...com,
        linux-api@...r.kernel.org
Subject: Re: [PATCH v2 bpf-next 2/3] bpf: implement CAP_BPF

Le 29/08/2019 à 19:30, Alexei Starovoitov a écrit :
[snip]
> These are the links that showing that k8 can delegates caps.
> Are you saying that you know of folks who specifically
> delegate cap_sys_admin and cap_net_admin _only_ to a container to run bpf in there?
> 
Yes, we need cap_sys_admin only to load bpf:
tc filter add dev eth0 ingress matchall action bpf obj ./tc_test_kern.o sec test

I'm not sure to understand why cap_net_admin is not enough to run the previous
command (ie why load is forbidden).

I want to avoid sys_admin, thus cap_bpf will be ok. But we need to manage the
backward compatibility.

Regards,
Nicolas