linux-kernel - Re: [PATCH] Revert "tpm: pass an array of tpm_extend_digest structures to tpm_pcr

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Message-ID: <20190704195857.GB6105@elm>
Date:   Thu, 4 Jul 2019 14:58:58 -0500
From:   Tyler Hicks <tyhicks@...onical.com>
To:     Mimi Zohar <zohar@...ux.ibm.com>
Cc:     Roberto Sassu <roberto.sassu@...wei.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Michal Suchanek <msuchanek@...e.de>,
        linux-integrity@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Armijn Hemel <armijn@...ldur.nl>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org
Subject: Re: [PATCH] Revert "tpm: pass an array of tpm_extend_digest
 structures to tpm_pcr_extend()"

Hey Mimi!

On 2019-07-04 11:46:41, Mimi Zohar wrote:
> Hi Jarkko,
> 
> On Thu, 2019-07-04 at 07:48 -0400, Mimi Zohar wrote:
> > On Thu, 2019-07-04 at 13:28 +0200, Roberto Sassu wrote:
> > > On 7/4/2019 12:03 PM, Jarkko Sakkinen wrote:
> > > > On Mon, 2019-07-01 at 15:15 +0200, Michal Suchanek wrote:
> > > >> This reverts commit 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 to avoid
> > > >> following crash:
> > > > 
> > > > Thank you. I think this the right choice for the moment. I fixed
> > > > a trivial checkpatch.pl error and added the mandatory tags. Can
> > > > you check quickly v2 (just posted)?
> > > > 
> > > > I already made it available in my master and next.
> > > 
> > > Could you please wait few days? I would prefer to fix this issue instead
> > > of reverting the whole patch.
> > 
> > Nayna posted a patch late yesterday titled "tpm: fixes uninitialized
> > allocated banks for IBM vtpm driver", which addresses this bug.
> 
> Now with my review, and with Sachin Sant's and Michal Suchánek
> testing, instead of reverting this patch could you pick up Nayna's
> patch instead?

It looks to me like the revert would also fix a bug that is keeping the
eCryptfs module from loading when the TPM is in an "inactive" state:

  https://bugzilla.kernel.org/show_bug.cgi?id=203953

I just noticed that it was recently discussed here, too:

  https://lore.kernel.org/linux-integrity/1562244125.6165.95.camel@linux.ibm.com/T/#t

I believe that the revert would fix it because the call to
init_digests()/tpm_get_random() would no longer be in the path of
loading ecryptfs.ko (which depends on encrypted-keys.ko, which depends
on trusted.ko).

If the revert isn't used, we'll need a different fix for bug 203953. It
should be an easy fix but I don't want it to be forgotten.

Tyler

> 
> thanks!
> 
> Mimi
>