linux-kernel - Re: [PATCH] Revert "tpm: pass an array of tpm_extend_digest structures to tpm_pcr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <abcc3748-8471-8965-046e-9d9431b4f0e9@linux.vnet.ibm.com>
Date:   Fri, 5 Jul 2019 11:20:53 -0400
From:   Nayna <nayna@...ux.vnet.ibm.com>
To:     Tyler Hicks <tyhicks@...onical.com>
Cc:     Mimi Zohar <zohar@...ux.ibm.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Michal Suchanek <msuchanek@...e.de>,
        linux-integrity@...r.kernel.org, Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dmitry Kasatkin <dmitry.kasatkin@...il.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        David Howells <dhowells@...hat.com>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Armijn Hemel <armijn@...ldur.nl>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org
Subject: Re: [PATCH] Revert "tpm: pass an array of tpm_extend_digest
 structures to tpm_pcr_extend()"

Hi Tyler,


On 07/04/2019 03:58 PM, Tyler Hicks wrote:
> Hey Mimi!
>
> On 2019-07-04 11:46:41, Mimi Zohar wrote:
>> Hi Jarkko,
>>
>> On Thu, 2019-07-04 at 07:48 -0400, Mimi Zohar wrote:
>>> On Thu, 2019-07-04 at 13:28 +0200, Roberto Sassu wrote:
>>>> On 7/4/2019 12:03 PM, Jarkko Sakkinen wrote:
>>>>> On Mon, 2019-07-01 at 15:15 +0200, Michal Suchanek wrote:
>>>>>> This reverts commit 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 to avoid
>>>>>> following crash:
>>>>> Thank you. I think this the right choice for the moment. I fixed
>>>>> a trivial checkpatch.pl error and added the mandatory tags. Can
>>>>> you check quickly v2 (just posted)?
>>>>>
>>>>> I already made it available in my master and next.
>>>> Could you please wait few days? I would prefer to fix this issue instead
>>>> of reverting the whole patch.
>>> Nayna posted a patch late yesterday titled "tpm: fixes uninitialized
>>> allocated banks for IBM vtpm driver", which addresses this bug.
>> Now with my review, and with Sachin Sant's and Michal Suchánek
>> testing, instead of reverting this patch could you pick up Nayna's
>> patch instead?
> It looks to me like the revert would also fix a bug that is keeping the
> eCryptfs module from loading when the TPM is in an "inactive" state:
>
>    https://bugzilla.kernel.org/show_bug.cgi?id=203953
>
> I just noticed that it was recently discussed here, too:
>
>    https://lore.kernel.org/linux-integrity/1562244125.6165.95.camel@linux.ibm.com/T/#t
>
> I believe that the revert would fix it because the call to
> init_digests()/tpm_get_random() would no longer be in the path of
> loading ecryptfs.ko (which depends on encrypted-keys.ko, which depends
> on trusted.ko).
>
> If the revert isn't used, we'll need a different fix for bug 203953. It
> should be an easy fix but I don't want it to be forgotten.


I think if TPM is inactive/disabled, it needs to be handled during 
tpm_chip_register() itself. However, probably that needs more analysis 
and discussion. For now, in context of the trusted.ko module, it seems 
init_trusted() should "put_device", but continue even if init_digests() 
fails, that will fix the issue.


Thanks & Regards,
         - Nayna