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

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Date:   Tue, 20 Jun 2017 23:32:41 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        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 Tue, Jun 20, 2017 at 05:25:57PM -0400, Stefan Berger wrote:
> 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);

Ah. Thanks. I'll fix that.

> -struct tpm_startup_in {
> -       __be16  startup_type;
> -} __packed;
> -
> 
> struct tpm2_startup_in can probably be removed as well?
> 
>   Stefan

Not yet but soon. tpm2_shutdown() still uses it.

/Jarkko