linux-kernel - Re: [tpmdd-devel] [RFC] tpm2-space: add handling for global session exhaustion

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Date:   Thu, 9 Feb 2017 14:54:41 -0700
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Ken Goldman <kgoldman@...ibm.com>, greg@...ellic.com,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        tpmdd-devel@...ts.sourceforge.net
Subject: Re: [tpmdd-devel] [RFC] tpm2-space: add handling for global session
 exhaustion

On Thu, Feb 09, 2017 at 11:29:51AM -0800, James Bottomley wrote:
> On Thu, 2017-02-09 at 12:04 -0700, Jason Gunthorpe wrote:
> > On Thu, Feb 09, 2017 at 05:19:22PM +0200, Jarkko Sakkinen wrote:
> > > The current patch set does not define policy. The simple policy
> > > addition that could be added soon is the limit of connections
> > > because it is easy to implement in non-intrusive way.
> > 
> > It is also trivial for a userspace RM to limit the number of sessions
> > or connections or otherwise to manage this limitation. It is hard to
> > see why we'd need kernel support for this.
> 
> Because the kernel is a primary TPM user.

When I said 'this' I meant a kernel policy to limit the number of
user connections.

Jason