linux-kernel - Re: [PATCH v5 1/5] tpm: Return on tpm2_create_null

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Message-ID: <007fba97e174e28dd4fe3cfae1f0e09d510f6d87.camel@kernel.org>
Date: Tue, 08 Oct 2024 02:47:02 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Stefan Berger <stefanb@...ux.ibm.com>, linux-integrity@...r.kernel.org
Cc: James.Bottomley@...senPartnership.com, roberto.sassu@...wei.com, 
 mapengyu@...il.com, stable@...r.kernel.org, Mimi Zohar
 <zohar@...ux.ibm.com>,  David Howells <dhowells@...hat.com>, Paul Moore
 <paul@...l-moore.com>, James Morris <jmorris@...ei.org>,  "Serge E. Hallyn"
 <serge@...lyn.com>, Peter Huewe <peterhuewe@....de>, Jason Gunthorpe
 <jgg@...pe.ca>, keyrings@...r.kernel.org,
 linux-security-module@...r.kernel.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/5] tpm: Return on tpm2_create_null_primary() failure

On Thu, 2024-10-03 at 10:57 -0400, Stefan Berger wrote:
> 
> 
> On 9/21/24 8:08 AM, Jarkko Sakkinen wrote:
> > tpm2_sessions_init() does not ignores the result of
> 
> s/ignores/ignore
> 
> > tpm2_create_null_primary(). Address this by returning -ENODEV to
> > the
> > caller.
> 
> I am not sure why mapping all errors to -ENODEV resolves the fact
> that 
> tpm2_sessions_init() does not ignore the result of 
> tpm2_create_null_primary(). I think what you want is to return -
> ENODEV 
> from tpm2_auto_startup.

Fair point.

> 
> > 
> > Cc: stable@...r.kernel.org # v6.10+
> > Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation")
> > Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> > ---
> > v5:
> > - Do not print klog messages on error, as tpm2_save_context()
> > already
> >    takes care of this.
> > v4:
> > - Fixed up stable version.
> > v3:
> > - Handle TPM and POSIX error separately and return -ENODEV always
> > back
> >    to the caller.
> > v2:
> > - Refined the commit message.
> > ---
> >   drivers/char/tpm/tpm2-sessions.c | 5 +++--
> >   1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/char/tpm/tpm2-sessions.c
> > b/drivers/char/tpm/tpm2-sessions.c
> > index d3521aadd43e..0f09ac33ae99 100644
> > --- a/drivers/char/tpm/tpm2-sessions.c
> > +++ b/drivers/char/tpm/tpm2-sessions.c
> > @@ -1338,7 +1338,8 @@ static int tpm2_create_null_primary(struct
> > tpm_chip *chip)
> >   		tpm2_flush_context(chip, null_key);
> >   	}
> >   
> > -	return rc;
> > +	/* Map all errors to -ENODEV: */
> > +	return rc ? -ENODEV : rc;
> 
> return rc ? -ENODEV : 0;
> 
> >   }
> >   
> >   /**
> > @@ -1354,7 +1355,7 @@ int tpm2_sessions_init(struct tpm_chip *chip)
> >   
> >   	rc = tpm2_create_null_primary(chip);
> >   	if (rc)
> > -		dev_err(&chip->dev, "TPM: security failed (NULL
> > seed derivation): %d\n", rc);
> > +		return rc;
> >   
> >   	chip->auth = kmalloc(sizeof(*chip->auth), GFP_KERNEL);
> >   	if (!chip->auth)

Thanks!


BR, Jarkko