linux-kernel - Re: [PATCH] tpm: Fix TPM 1.2 Shutdown sequence to prevent future TPM operations

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Message-ID: <20190711194313.3w6gkbayq7yifvgg@linux.intel.com>
Date:   Thu, 11 Jul 2019 22:43:13 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Douglas Anderson <dianders@...omium.org>, stable@...r.kernel.org,
        groeck@...omium.org, gregkh@...uxfoundation.org,
        sukhomlinov@...gle.com, Arnd Bergmann <arnd@...db.de>,
        Peter Huewe <peterhuewe@....de>, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org
Subject: Re: [PATCH] tpm: Fix TPM 1.2 Shutdown sequence to prevent future TPM
 operations

On Thu, Jul 11, 2019 at 09:35:33PM +0300, Jarkko Sakkinen wrote:
> > Careful with this, you can't backport this to any kernels that don't
> > have the sysfs ops locking changes or they will crash in sysfs code.
> 
> Oops, I was way too fast! Thanks Jason.

Hmm... hold on a second.

How would the crash realize? I mean this is at the point when user space
should not be active. Secondly, why the crash would not realize with
TPM2? The only thing the fix is doing is to do the same thing with TPM1
essentially.

/Jarkko