linux-kernel - Re: [PATCH 0/5] RDMA: reg_remote

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Message-ID: <8cdb77b6-c160-81d0-62be-5bbf84a98d69@opengridcomputing.com>
Date:   Tue, 29 Jan 2019 10:44:48 -0600
From:   Steve Wise <swise@...ngridcomputing.com>
To:     Joel Nider <joeln@...ibm.com>, Jason Gunthorpe <jgg@...pe.ca>
Cc:     Leon Romanovsky <leon@...nel.org>,
        Doug Ledford <dledford@...hat.com>,
        Mike Rapoport <rppt@...ux.ibm.com>, linux-mm@...ck.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] RDMA: reg_remote_mr


On 1/29/2019 7:26 AM, Joel Nider wrote:
> As discussed at LPC'18, there is a need to be able to register a memory
> region (MR) on behalf of another process. One example is the case of
> post-copy container migration, in which CRIU is responsible for setting
> up the migration, but the contents of the memory are from the migrating
> process. In this case, we want all RDMA READ requests to be served by
> the address space of the migration process directly (not by CRIU). This
> patchset implements a new uverbs command which allows an application to
> register a memory region in the address space of another process.

Hey Joel,

Dumb question:

Doesn't this open a security hole by allowing any process to register
memory in any other process?

Steve.