netdev - Re: [PATCH net-next] bpf, seccomp: prepare for upcoming criu support

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Date:	Fri, 2 Oct 2015 08:09:50 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Daniel Borkmann <daniel@...earbox.net>, davem@...emloft.net
Cc:	netdev@...r.kernel.org,
	Tycho Andersen <tycho.andersen@...onical.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Kees Cook <keescook@...omium.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH net-next] bpf, seccomp: prepare for upcoming criu support

On 10/2/15 6:17 AM, Daniel Borkmann wrote:
> The current ongoing effort to dump existing cBPF seccomp filters back
> to user space requires to hold the pre-transformed instructions like
> we do in case of socket filters from sk_attach_filter() side, so they
> can be reloaded in original form at a later point in time by utilities
> such as criu.
>
> To prepare for this, simply extend the bpf_prog_create_from_user()
> API to hold a flag that tells whether we should store the original
> or not. Also, fanout filters could make use of that in future for
> things like diag. While fanout filters already use bpf_prog_destroy(),
> move seccomp over to them as well to handle original programs when
> present.
>
> Signed-off-by: Daniel Borkmann<daniel@...earbox.net>

I agree that adding flag to bpf_prog_create_from_user() is cleaner
than exposing static bpf_prog_store_orig_filter(), so
Acked-by: Alexei Starovoitov <ast@...mgrid.com>
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