Message-ID: <20190207212912.GD23906@linux.intel.com>
Date:   Thu, 7 Feb 2019 23:29:12 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Alexander Steffen <Alexander.Steffen@...ineon.com>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Peter Huewe <PeterHuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Tomas Winkler <tomas.winkler@...el.com>,
        Tadeusz Struk <tadeusz.struk@...el.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        Nayna Jain <nayna@...ux.ibm.com>
Subject: Re: [PATCH v11 00/16] Remove nested TPM operations

On Thu, Feb 07, 2019 at 07:41:56PM +0100, Alexander Steffen wrote:
> On 06.02.2019 13:06, Jarkko Sakkinen wrote:
> > On Wed, Feb 06, 2019 at 12:47:07AM +0200, Jarkko Sakkinen wrote:
> > > Make the changes necessary to detach TPM space code and TPM activation
> > > code out of the tpm_transmit() flow because of both of these can cause
> > > nested tpm_transmit() calls. The nesteds calls make the whole flow hard
> > > to maintain, and thus, it is better to just fix things now before this
> > > turns into a bigger mess.
> > > 
> > > v11:
> > > * Drop the patch that tries to flush TPM space on system. Not a proper
> > >    fallback + out of scope for this patch set.
> > > 
> > > v10:
> > > * Use void pointers to avoid unnecessary casts in functions paramaters
> > >    where it makes sense.
> > > 
> > > v9:
> > > * Fixed again tpm_try_get_ops().
> > > * Added missing reviewed-by's.
> > > 
> > > v8:
> > > * Re-add the check for ret < 0 after calling tpm_try_transmit() that
> > >    was dropped by mistake while moving code.
> > > * Fix error fallback for tpm_try_get_ops() when tpm_chip_start()
> > >    fails.
> > > 
> > > v7:
> > > *  Reorganize series so that more trivial and self-contained changes are
> > >     in the head.
> > > 
> > > v6:
> > > * When tpm_validate_commmand() was moved to tpm2-space.c, the struct for
> > >    the TPM header was incorrectly declared as struct tpm_input_header.
> > > * Fix return value in tpm_validate_command().
> > > 
> > > v5:
> > > * Add the missing rev's from Stefan Berger.
> > > 
> > > v4:
> > > * Return 0 from pcrs_show() when tpm1_pcr_read() fails.
> > > * Fix error handling flow in tpm_try_transmit().
> > > * Replace struct tpm_input_header and struct tpm_output_header with
> > >    struct tpm_header.
> > > 
> > > v3:
> > > * Encapsulate power gating code to tpm_chip_start() and tpm_chip_stop().
> > > * Move TPM power gating code and locking to tpm_try_get_ops() and
> > >    tpm_put_ops().
> > > * Call power gating code directly in tpm_chip_register() and
> > >    tpm2_del_space().
> > > 
> > > v2:
> > > * Print tpm2_commit_space() error inside tpm2_commit_space()
> > > * Error code was not printed when recv() callback failed. It is
> > >    fixed in this version.
> > > * Added a patch that removes @space from tpm_transmit().
> > > * Fixed a regression in earlier series. Forgot to amend the change
> > >    from the staging area that renames NESTED to UNLOCKED in tpm2-space.c.
> > > 
> > > Jarkko Sakkinen (16):
> > >    tpm: use tpm_buf in tpm_transmit_cmd() as the IO parameter
> > >    tpm: fix invalid return value in pubek_show()
> > >    tpm: return 0 from pcrs_show() when tpm1_pcr_read() fails
> > >    tpm: print tpm2_commit_space() error inside tpm2_commit_space()
> > >    tpm: declare struct tpm_header
> > >    tpm: access command header through struct in tpm_try_transmit()
> > >    tpm: encapsulate tpm_dev_transmit()
> > >    tpm: clean up tpm_try_transmit() error handling flow
> > >    tpm: move tpm_validate_commmand() to tpm2-space.c
> > >    tpm: move TPM space code out of tpm_transmit()
> > >    tpm: remove @space from tpm_transmit()
> > >    tpm: use tpm_try_get_ops() in tpm-sysfs.c.
> > >    tpm: remove TPM_TRANSMIT_UNLOCKED flag
> > >    tpm: introduce tpm_chip_start() and tpm_chip_stop()
> > >    tpm: take TPM chip power gating out of tpm_transmit()
> > >    tpm: remove @flags from tpm_transmit()
> > > 
> > >   drivers/char/tpm/tpm-chip.c       | 109 ++++++++++++
> > >   drivers/char/tpm/tpm-dev-common.c |  44 ++++-
> > >   drivers/char/tpm/tpm-interface.c  | 264 ++++++------------------------
> > >   drivers/char/tpm/tpm-sysfs.c      | 138 ++++++++++------
> > >   drivers/char/tpm/tpm.h            |  64 +++-----
> > >   drivers/char/tpm/tpm1-cmd.c       |  28 +---
> > >   drivers/char/tpm/tpm2-cmd.c       |  72 +++-----
> > >   drivers/char/tpm/tpm2-space.c     |  91 +++++++---
> > >   drivers/char/tpm/tpm_i2c_atmel.c  |   5 +-
> > >   drivers/char/tpm/tpm_vtpm_proxy.c |  12 +-
> > >   drivers/char/tpm/xen-tpmfront.c   |   2 +-
> > >   11 files changed, 408 insertions(+), 421 deletions(-)
> > > 
> > > -- 
> > > 2.19.1
> > > 
> > 
> > Applied to master and next.
> 
> Something in this series seems to break basic TPM communication for me.
> 
> For TPM2.0s the probe command fails, causing them to be misdetected as
> TPM1.2s:
> 
> ---
> tpm tpm0: tpm_try_transmit: tpm_send: error -5
> tpm_tis MSFT0101:00: 1.2 TPM (device-id 0x1A, rev-id 22)
> tpm tpm0: A TPM error (30) occurred attempting to determine the timeouts
> ---
> tpm tpm0: tpm_try_transmit: tpm_send: error -5
> tpm_tis_spi spi0.1: 1.2 TPM (device-id 0x1B, rev-id 22)
> tpm tpm0: A TPM error (30) occurred attempting to determine the timeouts
> ---
> 
> And for something that actually is a TPM1.2 it fails in a similar way:
> 
> ---
> tpm_i2c_infineon 1-0020: 1.2 TPM (device-id 0x1A)
> tpm tpm0: A TPM error (-14) occurred attempting to determine the timeouts
> ---
> tpm tpm0: tpm_try_transmit: tpm_send: error -5
> tpm_tis_spi spi0.1: 1.2 TPM (device-id 0x1B, rev-id 16)
> tpm tpm0: A TPM error (-14) occurred attempting to determine the timeouts
> tpm_tis_spi: probe of spi0.1 failed with error -14
> ---
> 
> I see this problem across my entire range of TPM devices and test platforms.
> Any idea what could be wrong here?

Weird.

Can you run a bisect?

/Jarkko

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