From: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
To: Jason Gunthorpe
<jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
Cc: Stefan Berger
<stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs
Date: Wed, 16 Mar 2016 22:37:50 +0200 [thread overview]
Message-ID: <20160316203750.GA23966@intel.com> (raw)
In-Reply-To: <20160316174904.GA6127-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
On Wed, Mar 16, 2016 at 11:49:04AM -0600, Jason Gunthorpe wrote:
> On Wed, Mar 16, 2016 at 02:09:16PM +0200, Jarkko Sakkinen wrote:
> > On Sun, Mar 13, 2016 at 06:54:38PM -0400, Stefan Berger wrote:
>
> > Alternative to this would be to have /dev/vtpmx create:
> >
> > * /dev/vtpm0 for the server
> > * /dev/tpm0 for the client
> >
> > This is how David Howell's PoC worked and that's why I want
> > to make this alternative visible.
> >
> > The server could even respawn without container noticing it.
> > This solution have better availability properties.
>
> Seriously, no, that doesn't make any sense. TPM is stateful, you can't
> respawn the server side.
>
> If anyone is ever clever enough to make that workable then they just
> go ahead and save the server fd with the other state. systemd for
> instance already has everything needed to make that work.
>
> We don't need to have a server dev node and we certainly don't need
> the leaking problem that leaves us with.
Fair enough.
> Jason
/Jarkko
WARNING: multiple messages have this Message-ID (diff)
From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Stefan Berger <stefanb@linux.vnet.ibm.com>,
tpmdd-devel@lists.sourceforge.net,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-api@vger.kernel.org, dhowells@redhat.com
Subject: Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs
Date: Wed, 16 Mar 2016 22:37:50 +0200 [thread overview]
Message-ID: <20160316203750.GA23966@intel.com> (raw)
In-Reply-To: <20160316174904.GA6127@obsidianresearch.com>
On Wed, Mar 16, 2016 at 11:49:04AM -0600, Jason Gunthorpe wrote:
> On Wed, Mar 16, 2016 at 02:09:16PM +0200, Jarkko Sakkinen wrote:
> > On Sun, Mar 13, 2016 at 06:54:38PM -0400, Stefan Berger wrote:
>
> > Alternative to this would be to have /dev/vtpmx create:
> >
> > * /dev/vtpm0 for the server
> > * /dev/tpm0 for the client
> >
> > This is how David Howell's PoC worked and that's why I want
> > to make this alternative visible.
> >
> > The server could even respawn without container noticing it.
> > This solution have better availability properties.
>
> Seriously, no, that doesn't make any sense. TPM is stateful, you can't
> respawn the server side.
>
> If anyone is ever clever enough to make that workable then they just
> go ahead and save the server fd with the other state. systemd for
> instance already has everything needed to make that work.
>
> We don't need to have a server dev node and we certainly don't need
> the leaking problem that leaves us with.
Fair enough.
> Jason
/Jarkko
next prev parent reply other threads:[~2016-03-16 20:37 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-13 22:54 [PATCH v8 00/10] Multi-instance vTPM proxy driver Stefan Berger
2016-03-13 22:54 ` Stefan Berger
[not found] ` <1457909680-14085-1-git-send-email-stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2016-03-13 22:54 ` [PATCH v8 01/10] tpm: Get rid of chip->pdev Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 02/10] tpm: Get rid of devname Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 03/10] tpm: Provide strong locking for device removal Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 04/10] tpm: Get rid of module locking Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 05/10] tpm: Split out the devm stuff from tpmm_chip_alloc Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 06/10] tpm: Replace device number bitmap with IDR Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-15 5:58 ` Jarkko Sakkinen
2016-03-13 22:54 ` [PATCH v8 07/10] tpm: Introduce TPM_CHIP_FLAG_VIRTUAL Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-14 16:26 ` Jarkko Sakkinen
[not found] ` <1457909680-14085-9-git-send-email-stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2016-03-16 12:09 ` Jarkko Sakkinen
2016-03-16 12:09 ` Jarkko Sakkinen
[not found] ` <20160316120916.GA14820-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-03-16 13:49 ` Stefan Berger
2016-03-16 13:49 ` Stefan Berger
2016-03-16 17:49 ` Jason Gunthorpe
[not found] ` <20160316174904.GA6127-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-03-16 20:37 ` Jarkko Sakkinen [this message]
2016-03-16 20:37 ` Jarkko Sakkinen
2016-03-16 20:42 ` Jarkko Sakkinen
[not found] ` <20160316204244.GB23966-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-03-17 17:45 ` Stefan Berger
2016-03-17 17:45 ` Stefan Berger
2016-03-18 8:52 ` Jarkko Sakkinen
[not found] ` <20160318085200.GA5604-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-03-18 11:58 ` Stefan Berger
2016-03-18 13:06 ` Jarkko Sakkinen
2016-03-13 22:54 ` [PATCH v8 09/10] tpm: Initialize TPM and get durations and timeouts Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-22 6:34 ` [v8,09/10] " Jarkko Sakkinen
2016-03-22 10:54 ` Stefan Berger
2016-03-29 15:31 ` [v8,09/10] tpm: Initialize TPM and get durations and timeoutsg Jarkko Sakkinen
[not found] ` <20160329153143.GA15083-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-03-29 15:53 ` Stefan Berger
2016-03-29 15:53 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 10/10] tpm: Add documentation for the tpm_vtpm device driver Stefan Berger
2016-03-13 22:54 ` Stefan Berger
2016-03-29 16:24 ` [PATCH v8 00/10] Multi-instance vTPM proxy driver Jarkko Sakkinen
[not found] ` <20160329162433.GB24833-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-03-29 16:31 ` Stefan Berger
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