linux-kernel - Re: [PATCH v3] tpm: tpm_ibm

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Date:   Thu, 11 Jul 2019 23:28:24 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Nayna Jain <nayna@...ux.ibm.com>
Cc:     linux-integrity@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...pe.ca>,
        Sachin Sant <sachinp@...ux.vnet.ibm.com>,
        George Wilson <gcwilson@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Suchanek <msuchanek@...e.de>,
        Peter Huewe <peterhuewe@....de>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: Re: [PATCH v3] tpm: tpm_ibm_vtpm: Fix unallocated banks

On Thu, Jul 11, 2019 at 12:13:35PM -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")
> Reported-by: Michal Suchanek <msuchanek@...e.de>
> Signed-off-by: Nayna Jain <nayna@...ux.ibm.com>
> Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>
> Tested-by: Sachin Sant <sachinp@...ux.vnet.ibm.com>
> Tested-by: Michal Suchánek <msuchanek@...e.de>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

/Jarkko