linux-kernel - Re: [PATCH] tpm: consolidate the TPM startup code

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Message-Id: <bcae756a-ab3a-f8ba-554c-61952e992844@linux.vnet.ibm.com>
Date:   Tue, 20 Jun 2017 17:25:57 -0400
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: consolidate the TPM startup code

On 06/20/2017 04:55 PM, Jarkko Sakkinen wrote:
> On Tue, Jun 20, 2017 at 01:31:52PM -0600, Jason Gunthorpe wrote:
>> On Tue, Jun 20, 2017 at 08:13:34PM +0200, Jarkko Sakkinen wrote:
>>> Consolidated all the "manual" TPM startup code to a single function
>>> in order to make code flows a bit cleaner and migrate to tpm_buf.
>>>
>>> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>>>   drivers/char/tpm/tpm-interface.c | 67 +++++++++++++++++++++++++---------------
>>>   drivers/char/tpm/tpm.h           |  6 +---
>>>   drivers/char/tpm/tpm2-cmd.c      | 32 +------------------
>>>   3 files changed, 44 insertions(+), 61 deletions(-)
>> Makes sense to me
>>
>>> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
>>> index d2b4df6d9894..fbef47d8bd06 100644
>>> +++ b/drivers/char/tpm/tpm-interface.c
>>> @@ -540,6 +540,47 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
>>>   }
>>>   EXPORT_SYMBOL_GPL(tpm_transmit_cmd);
>>>   
>>> +#define TPM_ORD_STARTUP 153
>>> +#define TPM_ST_CLEAR 1
>> We should really have a tpm1.h and tpm2.h that has all these various
>> constants and things instead of open coding them randomly all over..
>>
>> Jason
> I agree.
>
> Is this patch acceptable to be applied?
>
> Stefan, can you peer test this with a TPM emulator? For convenient testing
> I created 'readpubek' branch that includes also my readpubek bug fixes.
> Seeing that the module loads and you can output pubek sysfs attribute is
> sufficient for seeing that all the three patches work.

Doesn't work. The startup_type is be16, but you are appending a u32 now 
for both TPM1.2 and TPM2.

+               tpm_buf_append_u32(&buf, TPM_ST_CLEAR);


-struct tpm_startup_in {
-       __be16  startup_type;
-} __packed;
-

struct tpm2_startup_in can probably be removed as well?

   Stefan

>
> /Jarkko
>