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Date:   Thu, 21 Mar 2019 13:43:35 +0000
From:   Luis Chamberlain <mcgrof@kernel.org>
To:     Andrea Arcangeli <aarcange@redhat.com>
Cc:     "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Peter Xu <peterx@redhat.com>, linux-kernel@vger.kernel.org,
        Paolo Bonzini <pbonzini@redhat.com>,
        Hugh Dickins <hughd@google.com>,
        Maxime Coquelin <maxime.coquelin@redhat.com>,
        Maya Gokhale <gokhale2@llnl.gov>,
        Jerome Glisse <jglisse@redhat.com>,
        Pavel Emelyanov <xemul@virtuozzo.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Martin Cracauer <cracauer@cons.org>,
        Denis Plotnikov <dplotnikov@virtuozzo.com>, linux-mm@kvack.org,
        Marty McFadden <mcfadden8@llnl.gov>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        Mike Rapoport <rppt@linux.vnet.ibm.com>,
        Kees Cook <keescook@chromium.org>,
        Mel Gorman <mgorman@suse.de>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v2 1/1] userfaultfd/sysctl: add
 vm.unprivileged_userfaultfd
Message-ID: <20190321134335.GB1146@42.do-not-panic.com>
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On Wed, Mar 20, 2019 at 03:01:12PM -0400, Andrea Arcangeli wrote:
> but
> that would be better be achieved through SECCOMP and not globally.'.

That begs the question why not use seccomp for this? What if everyone
decided to add a knob for all syscalls to do the same? For the commit
log, why is it OK then to justify a knob for this syscall?

 Luis