From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andrea Arcangeli <aarcange@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@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>,
Kees Cook <keescook@chromium.org>, Mel Gorman <mgorman@suse.de>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Linux-Fsdevel <linux-fsdevel@vger.kernel.org>,
"Dr . David Alan Gilbert" <dgilbert@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Daniel Borkmann <daniel@iogearbox.net>
Subject: Re: [PATCH 0/3] userfaultfd: allow to forbid unprivileged users
Date: Thu, 14 Mar 2019 08:23:13 -0700 [thread overview]
Message-ID: <CAADnVQLakteNHnoUZpOTVNK-ysbmqCRbPDM2XMgM9pWB-mGjhQ@mail.gmail.com> (raw)
In-Reply-To: <298b9469-abd2-b02b-5c71-529b8976a46c@redhat.com>
On Thu, Mar 14, 2019 at 4:00 AM Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 14/03/19 00:44, Andrea Arcangeli wrote:
> > Then I thought we can add a tristate so an open of /dev/kvm would also
> > allow the syscall to make things more user friendly because
> > unprivileged containers ideally should have writable mounts done with
> > nodev and no matter the privilege they shouldn't ever get an hold on
> > the KVM driver (and those who do, like kubevirt, will then just work).
>
> I wouldn't even bother with the KVM special case. Containers can use
> seccomp if they want a fine-grained policy.
>
> (Actually I wouldn't bother with the knob at all; the attack surface of
> userfaultfd is infinitesimal compared to the BPF JIT...).
please name _one_ BPF JIT bug that affected unprivileged user space.
WARNING: multiple messages have this Message-ID (diff)
From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andrea Arcangeli <aarcange@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@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>,
Kees Cook <keescook@chromium.org>, Mel Gorman <mgorman@suse.de>,
"Kirill A . Shutemov" <kirill@shutemov.name>,
Linux-Fsdev
Subject: Re: [PATCH 0/3] userfaultfd: allow to forbid unprivileged users
Date: Thu, 14 Mar 2019 08:23:13 -0700 [thread overview]
Message-ID: <CAADnVQLakteNHnoUZpOTVNK-ysbmqCRbPDM2XMgM9pWB-mGjhQ@mail.gmail.com> (raw)
In-Reply-To: <298b9469-abd2-b02b-5c71-529b8976a46c@redhat.com>
On Thu, Mar 14, 2019 at 4:00 AM Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 14/03/19 00:44, Andrea Arcangeli wrote:
> > Then I thought we can add a tristate so an open of /dev/kvm would also
> > allow the syscall to make things more user friendly because
> > unprivileged containers ideally should have writable mounts done with
> > nodev and no matter the privilege they shouldn't ever get an hold on
> > the KVM driver (and those who do, like kubevirt, will then just work).
>
> I wouldn't even bother with the KVM special case. Containers can use
> seccomp if they want a fine-grained policy.
>
> (Actually I wouldn't bother with the knob at all; the attack surface of
> userfaultfd is infinitesimal compared to the BPF JIT...).
please name _one_ BPF JIT bug that affected unprivileged user space.
next prev parent reply other threads:[~2019-03-14 15:23 UTC|newest]
Thread overview: 60+ 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 ` Peter Xu
2019-03-11 9:36 ` [PATCH 1/3] userfaultfd/sysctl: introduce unprivileged_userfaultfd Peter Xu
2019-03-11 9:36 ` Peter Xu
2019-03-12 6:58 ` Mike Rapoport
2019-03-12 6:58 ` Mike Rapoport
2019-03-12 12:26 ` Peter Xu
2019-03-12 12:26 ` Peter Xu
2019-03-12 13:53 ` Mike Rapoport
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 ` Peter Xu
2019-03-11 9:37 ` [PATCH 3/3] userfaultfd: apply unprivileged_userfaultfd check Peter Xu
2019-03-11 9:37 ` Peter Xu
2019-03-11 9:58 ` 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 7:01 ` Mike Rapoport
2019-03-12 12:29 ` Peter Xu
2019-03-12 12:29 ` Peter Xu
2019-03-12 7:49 ` Kirill A. Shutemov
2019-03-12 7:49 ` Kirill A. Shutemov
2019-03-12 7:49 ` Kirill A. Shutemov
2019-03-12 12:43 ` Peter Xu
2019-03-12 12:43 ` Peter Xu
2019-03-12 12:43 ` Peter Xu
2019-03-12 19:59 ` Mike Kravetz
2019-03-12 19:59 ` Mike Kravetz
2019-03-13 6:00 ` Peter Xu
2019-03-13 6:00 ` Peter Xu
2019-03-13 8:22 ` Paolo Bonzini
2019-03-13 8:22 ` Paolo Bonzini
2019-03-13 18:52 ` Andrea Arcangeli
2019-03-13 18:52 ` Andrea Arcangeli
2019-03-13 19:12 ` Paolo Bonzini
2019-03-13 19:12 ` Paolo Bonzini
2019-03-13 19:12 ` Paolo Bonzini
2019-03-13 23:44 ` Andrea Arcangeli
2019-03-13 23:44 ` Andrea Arcangeli
2019-03-14 10:58 ` Paolo Bonzini
2019-03-14 10:58 ` Paolo Bonzini
2019-03-14 15:23 ` Alexei Starovoitov [this message]
2019-03-14 15:23 ` Alexei Starovoitov
2019-03-14 15:23 ` Alexei Starovoitov
2019-03-14 16:00 ` Paolo Bonzini
2019-03-14 16:00 ` Paolo Bonzini
2019-03-14 16:16 ` Andrea Arcangeli
2019-03-14 16:16 ` Andrea Arcangeli
2019-03-15 16:09 ` Kees Cook
2019-03-15 16:09 ` Kees Cook
2019-03-15 16:09 ` Kees Cook
2019-03-13 20:01 ` Mike Kravetz
2019-03-13 23:55 ` Andrea Arcangeli
2019-03-13 23:55 ` Andrea Arcangeli
2019-03-14 3:32 ` Mike Kravetz
2019-03-14 3:32 ` Mike Kravetz
2019-03-13 17:50 ` Mike Kravetz
2019-03-13 17:50 ` Mike Kravetz
2019-03-15 8:26 ` Peter Xu
2019-03-15 8:26 ` Peter Xu
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