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From: Tycho Andersen <tycho.andersen-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org>
Subject: Re: [PATCH 5/6] seccomp: add a way to attach a filter via eBPF fd
Date: Wed, 9 Sep 2015 08:47:24 -0600
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Cc: "Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
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To: Kees Cook <keescook-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
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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