From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.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 11:49:04 -0600 [thread overview]
Message-ID: <20160316174904.GA6127@obsidianresearch.com> (raw)
In-Reply-To: <20160316120916.GA14820@intel.com>
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.
Jason
next prev parent reply other threads:[~2016-03-16 17:49 UTC|newest]
Thread overview: 26+ 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 ` [PATCH v8 01/10] tpm: Get rid of chip->pdev Stefan Berger
2016-03-13 22:54 ` [PATCH v8 02/10] tpm: Get rid of devname 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 ` [PATCH v8 04/10] tpm: Get rid of module locking 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 ` [PATCH v8 06/10] tpm: Replace device number bitmap with IDR 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 ` [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs Stefan Berger
2016-03-14 16:26 ` Jarkko Sakkinen
2016-03-16 12:09 ` Jarkko Sakkinen
2016-03-16 13:49 ` Stefan Berger
2016-03-16 17:49 ` Jason Gunthorpe [this message]
2016-03-16 20:37 ` Jarkko Sakkinen
2016-03-16 20:42 ` Jarkko Sakkinen
2016-03-17 17:45 ` Stefan Berger
2016-03-18 8:52 ` Jarkko Sakkinen
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
2016-03-22 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
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
2016-03-29 16:24 ` [PATCH v8 00/10] Multi-instance vTPM proxy driver Jarkko Sakkinen
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