linux-kernel - Re: [PATCH v1] vdpa: Complement vdpa_nl

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Date:   Mon, 24 Jul 2023 15:11:55 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Lin Ma <linma@....edu.cn>, xuanzhuo@...ux.alibaba.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Parav Pandit <parav@...dia.com>,
        Eli Cohen <elic@...dia.com>,
        Dragos Tatulea <dtatulea@...dia.com>
Subject: Re: [PATCH v1] vdpa: Complement vdpa_nl_policy for nlattr length check

On Sun, Jul 23, 2023 at 6:02 PM Michael S. Tsirkin <mst@...hat.com> wrote:
>
> On Sun, Jul 23, 2023 at 05:48:46PM +0800, Lin Ma wrote:
> >
> > > Sure, that is another undergoing task I'm working on. If the nlattr is parsed with
> > > NL_VALIDATE_UNSPEC, any forgotten nlattr will be rejected, therefore (which is the default
> > > for modern nla_parse).
> >
> > For the general netlink interface, the deciding flag should be genl_ops.validate defined in
> > each ops. The default validate flag is strict, while the developer can overwrite the flag
> > with GENL_DONT_VALIDATE_STRICT to ease the validation. That is to say, safer code should
> > enforce NL_VALIDATE_STRICT by not overwriting the validate flag.
> >
> > Regrads
> > Lin
>
>
> Oh I see.
>
> It started here:
>
> commit 33b347503f014ebf76257327cbc7001c6b721956
> Author: Parav Pandit <parav@...dia.com>
> Date:   Tue Jan 5 12:32:00 2021 +0200
>
>     vdpa: Define vdpa mgmt device, ops and a netlink interface
>
> which did:
>
> +               .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
>
>
> which was most likely just a copy paste from somewhere, right Parav?
>
> and then everyone kept copying this around.
>
> Parav, Eli can we drop these? There's a tiny chance of breaking something
> but I feel there aren't that many users outside mlx5 yet, so if you
> guys can test on mlx5 and confirm no breakage, I think we are good.

Adding Dragos.

Thanks

>
> --
> MST
>