linux-kernel - Re: [PATCH v11 00/16] Remove nested TPM operations

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Date:   Wed, 6 Feb 2019 14:06:34 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     linux-integrity@...r.kernel.org
Cc:     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 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.

/Jarkko