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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Stefan Berger <stefanb@linux.ibm.com>
Cc: Alexander Steffen <Alexander.Steffen@infineon.com>,
	linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	Peter Huewe <PeterHuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>,
	Tomas Winkler <tomas.winkler@intel.com>,
	Tadeusz Struk <tadeusz.struk@intel.com>,
	Stefan Berger <stefanb@linux.vnet.ibm.com>,
	Nayna Jain <nayna@linux.ibm.com>
Subject: Re: [PATCH v11 00/16] Remove nested TPM operations
Date: Fri, 8 Feb 2019 15:17:54 +0200	[thread overview]
Message-ID: <20190208131754.GA18133@linux.intel.com> (raw)
In-Reply-To: <da69e24d-ad5c-1e7b-9f02-a435872ad635@linux.ibm.com>

On Fri, Feb 08, 2019 at 08:10:32AM -0500, Stefan Berger wrote:
> On 2/8/19 8:02 AM, Jarkko Sakkinen wrote:
> > On Fri, Feb 08, 2019 at 07:05:26AM -0500, Stefan Berger wrote:
> > > See my comment on [PATCH v11 08/16]. It needs to be added in that patch
> > > since otherwise rc holds a non-zero value on function exit, which is wrong
> > > at that point.
> > The snippet in question:
> > 
> > rc = chip->ops->send(chip, buf, count);
> > if (rc < 0) {
> > 	if (rc != -EPIPE)
> > 		dev_err(&chip->dev,
> > 			"%s: tpm_send: error %d\n", __func__, rc);
> > 	return rc;
> > }
> > 
> > if (chip->flags & TPM_CHIP_FLAG_IRQ)
> > 	goto out_recv;
> > 
> > 'send()' ought to return zero on success case.
> > 
> > This is how the snippet was before applying any patches scheduled for
> > v5.1:
> > 
> > rc = chip->ops->send(chip, buf, count);
> > if (rc < 0) {
> > 	if (rc != -EPIPE)
> > 		dev_err(&chip->dev,
> > 			"%s: tpm_send: error %d\n", __func__, rc);
> > 	return rc;
> > }
> > 
> > if (chip->flags & TPM_CHIP_FLAG_IRQ)
> > 	goto out_recv;
> > 
> > Does not compute.
> 
> tpm_tis_send_main returns 'len' and that's what we have here.

Before doing any kind of code change, we should at least know what
has caused this that it has worked before.

And also which commit caused the regression to happen, because it
looks like a bug in tpm_tis_core, not in the main TPM driver. It
would need the fixes tag and cc to stable.

/Jarkko

  reply	other threads:[~2019-02-08 13:18 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-05 22:47 [PATCH v11 00/16] Remove nested TPM operations Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 01/16] tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 02/16] tpm: fix invalid return value in pubek_show() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 03/16] tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 04/16] tpm: print tpm2_commit_space() error inside tpm2_commit_space() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 05/16] tpm: declare struct tpm_header Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 06/16] tpm: access command header through struct in tpm_try_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 07/16] tpm: encapsulate tpm_dev_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 08/16] tpm: clean up tpm_try_transmit() error handling flow Jarkko Sakkinen
2019-02-07 23:36   ` Stefan Berger
2019-02-05 22:47 ` [PATCH v11 09/16] tpm: move tpm_validate_commmand() to tpm2-space.c Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 10/16] tpm: move TPM space code out of tpm_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 11/16] tpm: remove @space from tpm_transmit() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 12/16] tpm: use tpm_try_get_ops() in tpm-sysfs.c Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 13/16] tpm: remove TPM_TRANSMIT_UNLOCKED flag Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 14/16] tpm: introduce tpm_chip_start() and tpm_chip_stop() Jarkko Sakkinen
2019-02-05 22:47 ` [PATCH v11 15/16] tpm: take TPM chip power gating out of tpm_transmit() Jarkko Sakkinen
2019-02-07 23:32   ` Stefan Berger
2019-02-08  0:02     ` Jerry Snitselaar
2019-02-05 22:47 ` [PATCH v11 16/16] tpm: remove @flags from tpm_transmit() Jarkko Sakkinen
2019-02-06 12:06 ` [PATCH v11 00/16] Remove nested TPM operations Jarkko Sakkinen
2019-02-07 18:41   ` Alexander Steffen
2019-02-07 21:14     ` Stefan Berger
2019-02-07 21:29     ` Jarkko Sakkinen
2019-02-07 23:29       ` Stefan Berger
2019-02-08  0:33         ` Jarkko Sakkinen
2019-02-08  1:51           ` Stefan Berger
2019-02-08  2:14             ` Stefan Berger
2019-02-08 11:50               ` Jarkko Sakkinen
2019-02-08 12:22                 ` Stefan Berger
2019-02-08 13:12                   ` Jarkko Sakkinen
2019-02-08 13:28               ` Alexander Steffen
2019-02-08 14:09                 ` Jarkko Sakkinen
2019-02-08 18:02                   ` Alexander Steffen
2019-02-08 11:14             ` Jarkko Sakkinen
2019-02-08 12:05               ` Stefan Berger
2019-02-08 13:02                 ` Jarkko Sakkinen
2019-02-08 13:10                   ` Stefan Berger
2019-02-08 13:17                     ` Jarkko Sakkinen [this message]
2019-02-08 13:33                       ` Jarkko Sakkinen
2019-02-08 14:02                         ` Stefan Berger
2019-02-08 14:08                           ` Jarkko Sakkinen

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