linux-kernel - Re: [PATCH 0/3] userfaultfd: allow to forbid unprivileged users

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Date:   Wed, 13 Mar 2019 15:12:28 -0400 (EDT)
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     Peter Xu <peterx@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Maxime Coquelin <maxime.coquelin@...hat.com>,
        kvm@...r.kernel.org, Jerome Glisse <jglisse@...hat.com>,
        Pavel Emelyanov <xemul@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Martin Cracauer <cracauer@...s.org>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>, linux-mm@...ck.org,
        Marty McFadden <mcfadden8@...l.gov>,
        Maya Gokhale <gokhale2@...l.gov>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        linux-fsdevel@...r.kernel.org,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/3] userfaultfd: allow to forbid unprivileged users


> On Wed, Mar 13, 2019 at 09:22:31AM +0100, Paolo Bonzini wrote:
> Unless somebody suggests a consistent way to make hugetlbfs "just
> work" (like we could achieve clean with CRIU and KVM), I think Oracle
> will need a one liner change in the Oracle setup to echo into that
> file in addition of running the hugetlbfs mount.

Hi Andrea, can you explain more in detail the risks of enabling
userfaultfd for unprivileged users?

Paolo

> Note that DPDK host bridge process will also need a one liner change
> to do a dummy open/close of /dev/kvm to unblock the syscall.
> 
> Thanks,
> Andrea
>