From mboxrd@z Thu Jan  1 00:00:00 1970
From: zohar@linux.vnet.ibm.com (Mimi Zohar)
Date: Mon, 12 Mar 2018 19:19:42 -0400
Subject: [PATCH] security: Fix IMA Kconfig for dependencies on ARM64
In-Reply-To: <20180312230501.GJ24717@ziepe.ca>
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	<1520461156.10396.654.camel@linux.vnet.ibm.com>
	<191cfd49-0c66-a5ef-3d2b-b6c4132aa294@codeaurora.org>
	<1520615461.12216.6.camel@HansenPartnership.com>
	<1520891598.3547.190.camel@linux.vnet.ibm.com>
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Message-ID: <1520896782.3547.245.camel@linux.vnet.ibm.com>
To: linux-security-module@vger.kernel.org
List-Id: linux-security-module.vger.kernel.org

On Mon, 2018-03-12 at 17:05 -0600, Jason Gunthorpe wrote:
> On Mon, Mar 12, 2018 at 06:58:45PM -0400, Mimi Zohar wrote:
> > On Mon, 2018-03-12 at 15:59 -0600, Jason Gunthorpe wrote:
> > > On Mon, Mar 12, 2018 at 05:53:18PM -0400, Mimi Zohar wrote:
> > > 
> > > > Using Kconfig to force the TPM to be builtin is not required, but
> > > > helpful. ?Users interested in IMA-measurement could configure the TPM
> > > > as builtin themselves. ?Without the TPM builtin, IMA goes into TPM-
> > > > bypass mode.
> > > 
> > > This issues, broadly speaking, we have lots of TPM drivers, selecting
> > > only some to actually support IMA shows we have some kind of problem
> > > here.
> > 
> > True, IMA is not selecting the older TPM vendor specific modules, but
> > only the newer TPM_TIS and now TPM_CRB modules. ?That doesn't imply
> > that IMA only supports some TPMs. ?It means that by default, these
> > TPMs are builtin. ?Anyone building a kernel, can select the vendor
> > specific TPM to be builtin.
> 
> That doesn't help distros, which is the main point of the complaint
> with this scheme :)

Years ago because of faulty TPM drivers, IMA was disabled in one of
the main distro's. ?Deciding which vendor specific TPMs should be
builtin, is a discussion between the distro's and TPM vendors.

Mimi

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