netdev - Re: [PATCH 5/6] seccomp: add a way to attach a filter via eBPF fd

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Date:	Wed, 9 Sep 2015 08:47:24 -0600
From:	Tycho Andersen <tycho.andersen@...onical.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
	Linux API <linux-api@...r.kernel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Will Drewry <wad@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Emelyanov <xemul@...allels.com>,
	"Serge E. Hallyn" <serge.hallyn@...ntu.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 5/6] seccomp: add a way to attach a filter via eBPF fd

On Tue, Sep 08, 2015 at 05:07:03PM -0700, Kees Cook wrote:
>
> Yeah, bpf's union looks good. Let's add a "command" flag, though:
> 
> seccomp(SECCOMP_MODE_FILTER_EBPF, int cmd, union, size);
> 
> And this cmd could be ADD_FD or something?
> 
> How's that look?

I think we can drop the size (using the same strategy as bpf() and
checking for zeroes at the end), and keep the same signature for
seccomp(); so:

seccomp(SECCOMP_MODE_FILTER_EBPF, SECCOMP_ADD_BPF_FD, &union)

Yes, I'll use this in the next version.

Tycho
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