Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n>

From	James Bottomley <James.Bottomley@HansenPartnership.com>
Newsgroups	linux.kernel
Subject	Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n>
Date	2017-02-25 00:10 +0100
Message-ID	<tex9T-7mc-7@gated-at.bofh.it> (permalink)
References	(3 earlier) <tenNh-yV-31@gated-at.bofh.it> <tes0y-3rI-27@gated-at.bofh.it> <tesDg-3VB-5@gated-at.bofh.it> <teuF4-5q2-19@gated-at.bofh.it> <tev85-5AX-3@gated-at.bofh.it>
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On Fri, 2017-02-24 at 13:52 -0700, Jason Gunthorpe wrote:
> On Fri, Feb 24, 2017 at 03:29:15PM -0500, James Bottomley wrote:
> > On Fri, 2017-02-24 at 11:11 -0700, Jason Gunthorpe wrote:
> > > On Fri, Feb 24, 2017 at 07:39:22PM +0200, Jarkko Sakkinen wrote:
> > > 
> > > > > I think therefore that tpmns<n> for TPM Namespace would be
> > > > > very
> > > > > appropriate.
> > > > 
> > > > Makes sense. We can go with tpmns.
> > > 
> > > When we have talked about TPM namespaces in the past it has been
> > > around the idea of restricting which TPMs the namespace has
> > > access 
> > > too and changing the 'kernel tpm' for that namespace.
> > 
> > Well, you know, nothing in the TPM Space code prevents us from
> > exposing
> > the namespace so that it could be shared.  However, I think the
> > namespace follows connect (device open) paradigm is pretty much the
> > behaviour everyone (including the kernel) wants, mostly because
> > TPM2
> > has such a tiny amount of resources that you're always dealing with
> > loadable keys meaning you don't really want to see anyone else's
> > volatile state.
> 
> I'm not arguing with that use model, I am asking what do you want to
> call the future feature that restricts which TPMs a process can view
> if you want to use the word namespace for the resource manager?

Well, as a glib answer, I'd say the TPM is a device, so the thing which
restricts device access to containers is the device cgroup ... that's
what we should be plugging into.  I'd have to look, but I suspect the
device cgroup basically operates on device node appearance, so it
should "just work"(tm).  I can explore when I'm back home.

James

> This is something Stephen B has been exploring in conjunction with
> vtpm. (eg restrict a container to only use a single vtpm and ban it
> from the system tpm)
> 
> Jason
> 
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Thread

[PATCH v2 0/7] in-kernel resource manager Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
  [PATCH v2 1/7] tpm: move length validation to tpm_transmit() Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
  [PATCH v2 7/7] tpm2: add session handle context saving and restoring to the space code Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
    Re: [PATCH v2 7/7] tpm2: add session handle context saving and  restoring to the space code Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-23 10:10 +0100
  [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
    Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-23 10:10 +0100
      Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 14:10 +0100
        Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-24 18:40 +0100
          Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-24 19:20 +0100
            Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 21:30 +0100
              Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-24 22:00 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-25 00:10 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-25 00:30 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-25 00:50 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-25 01:30 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-25 18:10 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-27 18:40 +0100
        Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-26 12:50 +0100
          Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> "Dr. Greg Wettstein" <greg@enjellic.com> - 2017-02-26 19:40 +0100
            Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Ken Goldman <kgold@linux.vnet.ibm.com> - 2017-02-28 20:00 +0100
          Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-27 18:40 +0100
    Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device link  /dev/tpms<n> Nayna <nayna@linux.vnet.ibm.com> - 2017-02-24 08:10 +0100
      Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 14:00 +0100
        Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device link  /dev/tpms<n> Nayna <nayna@linux.vnet.ibm.com> - 2017-02-27 12:50 +0100
          Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-27 16:10 +0100
  [PATCH v2 4/7] tpm: infrastructure for TPM spaces Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
    Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Nayna <nayna@linux.vnet.ibm.com> - 2017-02-21 19:30 +0100
      Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-22 18:40 +0100
        Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Ken Goldman <kgold@linux.vnet.ibm.com> - 2017-02-22 22:00 +0100
      Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-22 22:20 +0100
      Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Ken Goldman <kgold@linux.vnet.ibm.com> - 2017-02-22 22:30 +0100
    Re: [PATCH v2 4/7] tpm: infrastructure for TPM spaces James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 14:00 +0100
      Re: [PATCH v2 4/7] tpm: infrastructure for TPM spaces Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-24 18:10 +0100

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