linux-kernel - Re: [PATCH v6 1/2] Add UFFD_USER_MODE

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Message-Id: <20201123121108.24d178769cfc9500c7c51317@linux-foundation.org>
Date:   Mon, 23 Nov 2020 12:11:08 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Lokesh Gidra <lokeshgidra@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>, Peter Xu <peterx@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Biggers <ebiggers@...nel.org>,
        Daniel Colascione <dancol@...col.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-doc@...r.kernel.org, Kalesh Singh <kaleshsingh@...gle.com>,
        Calin Juravle <calin@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Shaohua Li <shli@...com>, Jerome Glisse <jglisse@...hat.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Nitin Gupta <nigupta@...dia.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-mm@...ck.kernel.org, Daniel Colascione <dancol@...gle.com>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>
Subject: Re: [PATCH v6 1/2] Add UFFD_USER_MODE_ONLY

On Mon, 23 Nov 2020 11:17:43 -0800 Lokesh Gidra <lokeshgidra@...gle.com> wrote:

> > > A future patch adds a knob allowing administrators to give some
> > > processes the ability to create userfaultfd file objects only if they
> > > pass UFFD_USER_MODE_ONLY, reducing the likelihood that these processes
> > > will exploit userfaultfd's ability to delay kernel page faults to open
> > > timing windows for future exploits.
> >
> > Can we assume that an update to the userfaultfd(2) manpage is in the
> > works?
> >
> Yes, I'm working on it. Can the kernel version which will have these
> patches be known now so that I can mention it in the manpage?

5.11, if all proceeds smoothly.