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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210325082352.GA2988009@infradead.org>
Date:   Thu, 25 Mar 2021 08:23:52 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Yongji Xie <xieyongji@...edance.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "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 Penttil?? <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: [PATCH v5 01/11] file: Export __receive_fd() to modules

On Mon, Mar 15, 2021 at 05:46:43PM +0800, Yongji Xie wrote:
> 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.

The real problem is now what helper to use, but rather that random
drivers should not just mess with the FD table like that.