netdev - Re: Re: [PATCH v5 01/11] file: Export __receive

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Message-ID: <CACycT3vrHOExXj6v8ULvUzdLcRkdzS5=TNK6=g4+RWEdN-nOJw@mail.gmail.com>
Date:   Mon, 15 Mar 2021 17:46:43 +0800
From:   Yongji Xie <xieyongji@...edance.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Parav Pandit <parav@...dia.com>, Bob Liu <bob.liu@...cle.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, viro@...iv.linux.org.uk,
        Jens Axboe <axboe@...nel.dk>, bcrl@...ck.org,
        Jonathan Corbet <corbet@....net>,
        Mika Penttilä <mika.penttila@...tfour.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: Re: [PATCH v5 01/11] file: Export __receive_fd() to modules

On Mon, Mar 15, 2021 at 5:08 PM Christoph Hellwig <hch@...radead.org> wrote:
>
> On Mon, Mar 15, 2021 at 01:37:11PM +0800, Xie Yongji wrote:
> > Export __receive_fd() so that some modules can use
> > it to pass file descriptor between processes.
>
> I really don't think any non-core code should do that, especilly not
> modular mere driver code.

Do you see any issue? Now I think we're able to do that with the help
of get_unused_fd_flags() and fd_install() in modules. But we may miss
some security stuff in this way. So I try to export __receive_fd() and
use it instead.

Thanks,
Yongji