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

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Message-Id: <20151005.065330.932479433879939477.davem@davemloft.net>
Date:	Mon, 05 Oct 2015 06:53:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	daniel@...earbox.net
Cc:	netdev@...r.kernel.org, tycho.andersen@...onical.com,
	xemul@...allels.com, keescook@...omium.org, luto@...capital.net,
	ast@...mgrid.com
Subject: Re: [PATCH net-next] bpf, seccomp: prepare for upcoming criu
 support

From: Daniel Borkmann <daniel@...earbox.net>
Date: Fri,  2 Oct 2015 15:17:33 +0200

> 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>

Applied, thanks Daniel.
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