linux-kernel - Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality prepended to command

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Date:   Wed, 10 May 2017 15:47:45 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:     tpmdd-devel@...ts.sourceforge.net,
        LSM List <linux-security-module@...r.kernel.org>,
        jgunthorpe@...idianresearch.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality
 prepended to command

On Tue, May 09, 2017 at 11:49:05AM -0400, Stefan Berger wrote:
> On 05/08/2017 07:43 PM, Jarkko Sakkinen wrote:
> > On Thu, May 04, 2017 at 04:03:18PM -0400, Stefan Berger wrote:
> > > On 05/04/2017 02:40 PM, Jarkko Sakkinen wrote:
> > > > On Thu, May 04, 2017 at 07:14:27AM -0400, Stefan Berger wrote:
> > > > > On 05/04/2017 05:17 AM, Jarkko Sakkinen wrote:
> > > > > > On Wed, May 03, 2017 at 07:40:48PM -0400, Stefan Berger wrote:
> > > > > > > On 05/03/2017 06:37 PM, Jarkko Sakkinen wrote:
> > > > > > > > On Fri, Apr 28, 2017 at 09:02:18AM -0400, Stefan Berger wrote:
> > > > > > > > > Add an ioctl to request that the locality be prepended to every TPM
> > > > > > > > > command.
> > > > > > > > Don't really understand this change. Why locality is prenpended?
> > > > > > > Commands can be executed under locality 0-3 and for some commands it is
> > > > > > > important to know which locality a user may have chosen. How else should we
> > > > > > > convey that locality to the TPM emulator ?
> > > > > > Why this is not in the commit message?
> > > > > > 
> > > > > > More scalable way to do this would be to have a set of vtpm proxy
> > > > > > commands. There could be a command for requesting and releasing
> > > > > > locality. That would be more clean.
> > > > > I would think that if someone wanted to use locality it's the client using
> > > > > /dev/tpm(rm)0 calling an ioctl or so and the vtpm proxy then merely passing
> > > > > that locality to the backend (TPM emulator). I suppose the intention is to
> > > > > support something like that following the addition of the new functions
> > > > > request_locality and release_locality?
> > > > What if we later on want to pass something else than locality to the
> > > > backend? How that will work out?
> > > 'push' more data in front. 'pop' off by recipient. We could wrap the command
> > > in some form.
> > > 
> > >      Stefan
> > I would find having a set of special commands cleaner. Prepending sounds
> > like a quick hack to me, not really something that should exist in the
> > mainline.
> 
> Along the lines of this here?
> 
> uint32_2 command
> uint32_2 totlength
> uint8_t locality
> uint8_t buffer[]  <- the actual TPM command
> 
> 
> With a command code like VTPM_PROXY_CMD_TPM_CMD = 1.
> 
>    Stefan

That would break binary compability.

I would suggest allocating CC's backwards starting from 0xFFFFFFFF for
these control messages and send them in regular TPM command layout. A
bit similar idea as we have in the RM.

/Jarkko