linux-kernel - Re: [tpmdd-devel] [PATCH RFC 0/4] RFC: in-kernel resource manager

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Date:   Wed, 11 Jan 2017 10:56:57 -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>,
        tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org, greg@...ellic.com,
        linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH RFC 0/4] RFC: in-kernel resource manager

On Wed, Jan 11, 2017 at 07:39:53AM -0800, James Bottomley wrote:

> RAW access means the ability to DoS the TPM simply by exhausting
> handles.  Therefore, I think most applications only get RM access.

Re-read what Jarkko is proposing. He is not making a complete safe &
secure RM in the kernel. He is making a tool to allow userspace and
the kernel to share the TPM sanely.

It is not an access control tool, it is not a security tool, it is not
intended to support safe unpriv userspace access.

So there is no reason to have a different access control model in
userspace, it is not a fundamentally different security environment
from the existing raw device.

A future project to provide an unpriv safe cdev from the kernel is
something different.

Jason