linux-kernel - Re: [PATCH] tpm: fixes uninitialized allocated banks for IBM vtpm driver

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Date:   Fri, 5 Jul 2019 12:51:58 +0200
From:   Michal Suchánek <msuchanek@...e.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Nayna Jain <nayna@...ux.ibm.com>, linux-integrity@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        Sachin Sant <sachinp@...ux.vnet.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, Mimi Zohar <zohar@...ux.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>, Peter Huewe <peterhuewe@....de>
Subject: Re: [PATCH] tpm: fixes uninitialized allocated banks for IBM vtpm
 driver

On Fri, 05 Jul 2019 13:42:18 +0300
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> wrote:

> On Wed, 2019-07-03 at 23:32 -0400, Nayna Jain wrote:
> > The nr_allocated_banks and allocated banks are initialized as part of
> > tpm_chip_register. Currently, this is done as part of auto startup
> > function. However, some drivers, like the ibm vtpm driver, do not run
> > auto startup during initialization. This results in uninitialized memory
> > issue and causes a kernel panic during boot.
> > 
> > This patch moves the pcr allocation outside the auto startup function
> > into tpm_chip_register. This ensures that allocated banks are initialized
> > in any case.
> > 
> > Fixes: 879b589210a9 ("tpm: retrieve digest size of unknown algorithms with
> > PCR read")
> > Signed-off-by: Nayna Jain <nayna@...ux.ibm.com>  
> 
> Please add
> 
> Reported-by: Michal Suchanek <msuchanek@...e.de>
> 
> It is missing. Michal is there a chance you could try this out once
> Nayna send a new version?

Should be easy to test. Without the patch the machine crashes on boot
so it is quite obvious case. I have a few VMs with the vTPM available.

Thanks

Michal