linux-kernel - Re: [PATCH net-next 1/6] bpf: support 8-byte metafield access

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Message-ID: <57C4C8E2.6040903@iogearbox.net>
Date:   Tue, 30 Aug 2016 01:44:34 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Alexei Starovoitov <ast@...com>,
        "David S . Miller" <davem@...emloft.net>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Brendan Gregg <bgregg@...flix.com>,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Wang Nan <wangnan0@...wei.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH net-next 1/6] bpf: support 8-byte metafield access

On 08/27/2016 04:31 AM, Alexei Starovoitov wrote:
> The verifier supported only 4-byte metafields in
> struct __sk_buff and struct xdp_md. The metafields in upcoming
> struct bpf_perf_event are 8-byte to match register width in struct pt_regs.
> Teach verifier to recognize 8-byte metafield access.
> The patch doesn't affect safety of sockets and xdp programs.
> They check for 4-byte only ctx access before these conditions are hit.
>
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>

Acked-by: Daniel Borkmann <daniel@...earbox.net>