linux-kernel - Re: [PATCH] KEYS: trusted: allow module init if TPM is inactive or deactivated

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Date:   Mon, 5 Aug 2019 11:04:52 -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>,
        jejb@...ux.ibm.com, jgg@...pe.ca, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org, crazyt2019+lml@...il.com,
        nayna@...ux.vnet.ibm.com, silviu.vlasceanu@...wei.com
Subject: Re: [PATCH] KEYS: trusted: allow module init if TPM is inactive or
 deactivated

On 2019-08-05 11:54:19, Mimi Zohar wrote:
> On Mon, 2019-08-05 at 16:50 +0200, Roberto Sassu wrote:
> > Regarding Mimi's proposal to avoid the issue by extending the PCR with
> > zeros, I think it also achieve the goal. 
> 
> Roberto, removing the following code from init_digests() would be the
> equivalent to the prior code, without needing to make any other
> changes.  Let's keep it simple.  Do you want to post the patch with
> the change, or should I?
> 
>         ret = tpm_get_random(chip, digest, TPM_MAX_DIGEST_SIZE);
>         if (ret < 0)
>                 return ret;
>         if (ret < TPM_MAX_DIGEST_SIZE)
>                 return -EFAULT;
> 
> As I can't duplicate the problem, it would need to be tested by others
> experiencing the problem.

The bug reporter tested Roberto's last patch:

 https://bugzilla.kernel.org/show_bug.cgi?id=203953#c8

We should Cc the reporter on future patches or at least leave another
testing request in the bugzilla.

Tyler

> 
> thanks,
> 
> Mimi
>