From: Kees Cook <keescook@chromium.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, Peter Xu <peterx@redhat.com>,
Mike Kravetz <mike.kravetz@oracle.com>,
LKML <linux-kernel@vger.kernel.org>,
Hugh Dickins <hughd@google.com>,
Luis Chamberlain <mcgrof@kernel.org>,
Maxime Coquelin <maxime.coquelin@redhat.com>,
KVM <kvm@vger.kernel.org>, 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 <linux-mm@kvack.org>,
Marty McFadden <mcfadden8@llnl.gov>,
Maya Gokhale <gokhale2@llnl.gov>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Mel Gorman <mgorman@suse.de>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 0/3] userfaultfd: allow to forbid unprivileged users
Date: Fri, 15 Mar 2019 09:09:45 -0700 [thread overview]
Message-ID: <CAGXu5j+WwcYTavVRp2M1AashdCwf2YX=RmUtO_5bHXPK9iZhGQ@mail.gmail.com> (raw)
In-Reply-To: <20190314161630.GS25147@redhat.com>
On Thu, Mar 14, 2019 at 9:16 AM Andrea Arcangeli <aarcange@redhat.com> wrote:
> So this will be for who's paranoid and prefers to disable userfaultfd
> as a whole as an hardening feature like the bpf sysctl allows: it will
> allow to block uffd syscall without having to rebuild the kernel with
> CONFIG_USERFAULTFD=n in environments where seccomp cannot be easily
> enabled (i.e. without requiring userland changes).
>
> That's very fine with me, but then it wasn't me complaining in the
> first place. Kees?
I'm fine with a boolean. I just wanted to find a way to disable at
runtime (so distro users had it available to them).
--
Kees Cook
next prev parent reply other threads:[~2019-03-15 16:15 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-11 9:36 [PATCH 0/3] userfaultfd: allow to forbid unprivileged users Peter Xu
2019-03-11 9:36 ` [PATCH 1/3] userfaultfd/sysctl: introduce unprivileged_userfaultfd Peter Xu
2019-03-12 6:58 ` Mike Rapoport
2019-03-12 12:26 ` Peter Xu
2019-03-12 13:53 ` Mike Rapoport
2019-03-11 9:37 ` [PATCH 2/3] kvm/mm: introduce MMF_USERFAULTFD_ALLOW flag Peter Xu
2019-03-11 9:37 ` [PATCH 3/3] userfaultfd: apply unprivileged_userfaultfd check Peter Xu
2019-03-11 9:58 ` Peter Xu
2019-03-12 7:01 ` [PATCH 0/3] userfaultfd: allow to forbid unprivileged users Mike Rapoport
2019-03-12 12:29 ` Peter Xu
2019-03-12 7:49 ` Kirill A. Shutemov
2019-03-12 12:43 ` Peter Xu
2019-03-12 19:59 ` Mike Kravetz
2019-03-13 6:00 ` Peter Xu
2019-03-13 8:22 ` Paolo Bonzini
2019-03-13 18:52 ` Andrea Arcangeli
2019-03-13 19:12 ` Paolo Bonzini
2019-03-13 23:44 ` Andrea Arcangeli
2019-03-14 10:58 ` Paolo Bonzini
2019-03-14 15:23 ` Alexei Starovoitov
2019-03-14 16:00 ` Paolo Bonzini
2019-03-14 16:16 ` Andrea Arcangeli
2019-03-15 16:09 ` Kees Cook [this message]
2019-03-13 20:01 ` Mike Kravetz
2019-03-13 23:55 ` Andrea Arcangeli
2019-03-14 3:32 ` Mike Kravetz
2019-03-13 17:50 ` Mike Kravetz
2019-03-15 8:26 ` Peter Xu
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