linux-kernel - Re: [PATCH 1/1] tpm/tpm_crb: Fix error message in __crb_relinquish

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Message-ID: <Y4z6OGSyvJtdVzIi@kernel.org>
Date:   Sun, 4 Dec 2022 19:51:20 +0000
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
Cc:     "peterhuewe@....de" <peterhuewe@....de>,
        "jgg@...pe.ca" <jgg@...pe.ca>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] tpm/tpm_crb: Fix error message in
 __crb_relinquish_locality()

On Tue, Nov 29, 2022 at 04:34:09AM +0000, Michael Kelley (LINUX) wrote:
> From: Jarkko Sakkinen <jarkko@...nel.org> Sent: Sunday, November 27, 2022 8:39 AM
> > 
> > On Fri, Nov 11, 2022 at 11:38:53AM -0800, Michael Kelley wrote:
> > > The error message in __crb_relinquish_locality() mentions requestAccess
> > > instead of Relinquish. Fix it.
> > >
> > > Fixes: 888d867df441 ("tpm: cmd_ready command can be issued only after granting locality")
> > > Signed-off-by: Michael Kelley <mikelley@...rosoft.com>
> > > ---
> > >  drivers/char/tpm/tpm_crb.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
> > > index 1860665..65f8f17 100644
> > > --- a/drivers/char/tpm/tpm_crb.c
> > > +++ b/drivers/char/tpm/tpm_crb.c
> > > @@ -252,7 +252,7 @@ static int __crb_relinquish_locality(struct device *dev,
> > >  	iowrite32(CRB_LOC_CTRL_RELINQUISH, &priv->regs_h->loc_ctrl);
> > >  	if (!crb_wait_for_reg_32(&priv->regs_h->loc_state, mask, value,
> > >  				 TPM2_TIMEOUT_C)) {
> > > -		dev_warn(dev, "TPM_LOC_STATE_x.requestAccess timed out\n");
> > > +		dev_warn(dev, "TPM_LOC_STATE_x.Relinquish timed out\n");
> > >  		return -ETIME;
> > >  	}
> > >
> > > --
> > > 1.8.3.1
> > >
> > 
> > Please explain.
> > 
> 
> There are two parallel functions:  __crb_request_locality() and
> __crb_relinquish_locality().  In the current code, both return the
> same text in the error message if a timeout occurs.  That
> error message seems appropriate for __crb_request_locality()
> since it is setting the "requestAccess" bit.
> 
> But the error message seems inappropriate for
> __crb_relinquish_locality(), which is setting the "Relinquish" bit.
> So the patch changes the error message to indicate that the
> timeout occurred in setting the Relinquish bit.
> 
> I'm looking at Section 6.5.3.2.2.1 in the TCG PC Client Platform
> TPM Profile Specification for TPM 2.0, Version 1.05 Revision 14.
> This is where the "requestAccess" and "Relinquish" bits are defined.
> 
> Or maybe I am not understanding what you are getting at with
> "Please explain."

I misread the callback name, when I first looked into this (in
too much rush). You're absolutely correct.

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko