linux-kernel - Re: [PATCH v2 1/1] userfaultfd/sysctl: add vm.unprivileged

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Message-ID: <20190321134335.GB1146@42.do-not-panic.com>
Date:   Thu, 21 Mar 2019 13:43:35 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Hugh Dickins <hughd@...gle.com>,
        Maxime Coquelin <maxime.coquelin@...hat.com>,
        Maya Gokhale <gokhale2@...l.gov>,
        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>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] userfaultfd/sysctl: add
 vm.unprivileged_userfaultfd

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