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

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Message-ID: <0d9f2f6f-9a69-5169-a92d-9ca7de3c0d18@huawei.com>
Date:   Mon, 5 Aug 2019 18:51:09 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     Tyler Hicks <tyhicks@...onical.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
CC:     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 8/5/2019 6:04 PM, Tyler Hicks wrote:
> 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.

I don't see the reporter's email. Please ask him to test the new patch.

Thanks

Roberto

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