linux-kernel - Re: [PATCH v2 1/2] Add UFFD_USER_MODE

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Date:   Tue, 25 Aug 2020 17:24:22 -0700
From:   Lokesh Gidra <lokeshgidra@...gle.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>, Peter Xu <peterx@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Biggers <ebiggers@...nel.com>,
        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>,
        Nick Kralevich <nnk@...gle.com>,
        Jeffrey Vander Stoep <jeffv@...gle.com>,
        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>,
        Daniel Colascione <dancol@...gle.com>
Subject: Re: [PATCH v2 1/2] Add UFFD_USER_MODE_ONLY

On Mon, Aug 24, 2020 at 5:32 AM Sebastian Andrzej Siewior
<bigeasy@...utronix.de> wrote:
>
> On 2020-08-21 18:40:17 [-0700], Lokesh Gidra wrote:
> > --- a/fs/userfaultfd.c
> > +++ b/fs/userfaultfd.c
> > @@ -1966,6 +1969,7 @@ static void init_once_userfaultfd_ctx(void *mem)
> >
> >  SYSCALL_DEFINE1(userfaultfd, int, flags)
> >  {
> > +     static const int uffd_flags = UFFD_USER_MODE_ONLY;
> >       struct userfaultfd_ctx *ctx;
> >       int fd;
> Why?

Not sure! I guess Daniel didn't want to repeat the long flag name twice.

Thanks for catching that. I'll send another version fixing this.
>
> Sebastian