linux-kernel - Re: [RFC PATCH 00/09] Implement direct user I/O interfaces for RDMA

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Date:   Thu, 17 May 2018 23:42:45 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Tom Talpey <tom@...pey.com>
Cc:     longli@...rosoft.com, Steve French <sfrench@...ba.org>,
        linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [RFC PATCH 00/09] Implement direct user I/O interfaces for RDMA

On Thu, May 17, 2018 at 07:10:04PM -0400, Tom Talpey wrote:
> What's the security risk? This type of direct i/o behavior is not
> uncommon, and can certainly be made safe, using the appropriate
> memory registration and protection domains. Any risk needs to be
> stated explicitly, and mitigation provided, or at least described.

And in fact it is the same behavior you'll see on NFS over RDMA, or
a block device or any local fs over SRP/iSER/NVMe over Fabrics..