linux-kernel - RE: [PATCH v5 12/21] tpm: move pcr extend code to tpm2-cmd.c

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Date:   Thu, 4 Oct 2018 13:46:00 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Roberto Sassu <roberto.sassu@...wei.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
CC:     Jason Gunthorpe <jgg@...pe.ca>,
        Nayna Jain <nayna@...ux.vnet.ibm.com>,
        "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "Struk, Tadeusz" <tadeusz.struk@...el.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v5 12/21] tpm: move pcr extend code to tpm2-cmd.c

> 
> On 10/4/2018 1:45 PM, Winkler, Tomas wrote:
> >
> >
> >> -----Original Message-----
> >> From: Jarkko Sakkinen [mailto:jarkko.sakkinen@...ux.intel.com]
> >> Sent: Thursday, October 04, 2018 14:35
> >> To: Winkler, Tomas <tomas.winkler@...el.com>
> >> Cc: Jason Gunthorpe <jgg@...pe.ca>; Nayna Jain
> >> <nayna@...ux.vnet.ibm.com>; Usyskin, Alexander
> >> <alexander.usyskin@...el.com>; Struk, Tadeusz
> >> <tadeusz.struk@...el.com>; linux-integrity@...r.kernel.org;
> >> linux-security-module@...r.kernel.org;
> >> linux-kernel@...r.kernel.org; roberto.sassu@...wei.com
> >> Subject: Re: [PATCH v5 12/21] tpm: move pcr extend code to tpm2-cmd.c
> >>
> >> On Wed, Oct 03, 2018 at 10:24:09PM +0000, Winkler, Tomas wrote:
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: Jarkko Sakkinen [mailto:jarkko.sakkinen@...ux.intel.com]
> >>>> Sent: Wednesday, October 03, 2018 15:02
> >>>> To: Winkler, Tomas <tomas.winkler@...el.com>
> >>>> Cc: Jason Gunthorpe <jgg@...pe.ca>; Nayna Jain
> >>>> <nayna@...ux.vnet.ibm.com>; Usyskin, Alexander
> >>>> <alexander.usyskin@...el.com>; Struk, Tadeusz
> >>>> <tadeusz.struk@...el.com>; linux-integrity@...r.kernel.org;
> >>>> linux-security-module@...r.kernel.org;
> >>>> linux-kernel@...r.kernel.org; roberto.sassu@...wei.com
> >>>> Subject: Re: [PATCH v5 12/21] tpm: move pcr extend code to
> >>>> tpm2-cmd.c
> >>>>
> >>>> On Tue, Oct 02, 2018 at 04:58:25AM +0000, Winkler, Tomas wrote:
> >>>>>
> >>>>>
> >>>>>>
> >>>>>> On Sat, Sep 29, 2018 at 01:30:26AM +0300, Tomas Winkler wrote:
> >>>>>>> Add tpm2_pcr_extend() function to tpm2-cmd.c with signature
> >>>>>>> required by tpm-interface.c. It wraps the original open code
> >>>> implementation.
> >>>>>>> The original original tpm2_pcr_extend() function is renamed to
> >>>>>>> __tpm2_pcr_extend() and made static, it is called only from new
> >>>>>>> tpm2_pcr_extend().
> >>>>>>>
> >>>>>>> Fix warnings in __tpm2_pcr_extend()
> >>>>>>> tpm2-cmd.c:251:16: warning: comparison between signed and
> >>>>>>> unsigned integer expressions [-Wsign-compare]
> >>>>>>> tpm2-cmd.c:252:17: warning: comparison between signed and
> >>>>>>> unsigned integer expressions [-Wsign-compare]
> >>>>>>>
> >>>>>>> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> >>>>>>
> >>>>>> We do not want the signature change, especially because as we are
> >>>>>> working on getting Roberto's changes in and also because it has
> >>>>>> absolutely a zero gain. Who cares if those functions take
> >>>>>> different
> >>>> parameters? I don't.
> >>>>>
> >>>>> Yes, we do care this series tries to have a clean cut between 1.x
> >>>>> and 2.x
> >>>> specs. Please, let's finish one transformation and then move to
> another.
> >>>>> I understand that Roberto will have to rebase anyhow, if this
> >>>>> series goes in
> >>>> first, if this is hard I can do it myself, it's trivial.
> >>>>>
> >>>>> Tomas
> >>>>
> >>>> I'm happy to tune this minor stuff.
> >>> What minor stuff?  This patch is just okay, let's change the API in
> >>> next
> >> round.
> >>
> >> The patch is not okay because it does a completely unnecessary API
> change.
> >
> > There is no API change, in that sense.
> > The exported API is in tpm-interface.c int tpm_pcr_extend(struct
> > tpm_chip *chip, int pcr_idx, const u8 *hash) that is used is outside
> > of the tpm reminds the same, only the open coded implementation of
> tpm2_pcr_extned has moved to tpm2-cmd.c, This code is not called out of
> tpm module.
> > Please review the code again.
> 
> Hi Tomas
> 
> I will update tpm_pcr_extend() by replacing the array of u8 with an array of
> tpm2_digest structures, so that the caller can provide multiple digests with
> one call. The array of tpm2_digest structures will be passed to
> tpm2_pcr_extend(). Please, don't modify the parameters of
> tpm2_pcr_extend().

What about tpm1_pcr_extend/read()? 

Thanks
Tomas