linux-kernel - Re: [PATCH 00/22] KEYS: Support TPM-wrapped key and crypto ops

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Message-ID: <1537270212.3424.4.camel@HansenPartnership.com>
Date:   Tue, 18 Sep 2018 07:30:12 -0400
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        David Howells <dhowells@...hat.com>,
        Marcel Holtmann <marcel@...tmann.org>
Cc:     James Morris <jmorris@...ei.org>,
        Denis Kenzior <denkenz@...il.com>, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/22] KEYS: Support TPM-wrapped key and crypto ops

On Tue, 2018-09-18 at 08:00 +0100, David Woodhouse wrote:
> 
> On Sat, 2018-09-08 at 16:26 +0100, David Howells wrote:
> > Marcel Holtmann <marcel@...tmann.org> wrote:
> > 
> > > 
> > > so I have reviewed and tested this code. In addition, we have
> > > test cases for it in ELL (embedded linux library).
> > 
> > I wonder if there's any practical way to add a test for this to the
> > keyutils test suite.  I'm guessing it's quite tricky, given the
> > extra bits you need to emulate the TPM.
> 
> Right, for a lot of userspace stuff we have the TPM emulator but for
> the kernel you might need to run in qemu, which I believe can emulate
> a TPM now (or at least, can talk to the TPM emulator, which has the
> same effect).

Actually, you don't necessarily.  I use this patch:

https://marc.info/?l=tpmdd-devel&m=148392353230117

Which allows me to make a TCP connection to the software TPM running in
userspace without having to have the TPM components in qemu (or even to
run virtual).  I used it to debug all the in-kernel resource manager
patches.  It's TPM 2.0, but could easily be modified to work with 1.2

James