[v3,00/16] Remove nested TPM operations

Message

Jarkko Sakkinen Nov. 5, 2018, 1:45 a.m. UTC

[was Detach TPM space code out of the tpm_transmit() flow but the scope
 expanded a bit.]

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.

The commits are available in a branch called 'nested' in

git://git.infradead.org/users/jjs/linux-tpmdd.git

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: call tpm2_flush_space() on error in tpm_try_transmit()
  tpm: print tpm2_commit_space() error inside tpm2_commit_space()
  tpm: clean up tpm_try_transmit() error handling flow
  tpm: access command header through struct in  tpm_try_transmit()
  tpm: move tpm_validate_commmand() to tpm2-space.c
  tpm: encapsulate tpm_dev_transmit()
  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       | 105 +++++++++++-
 drivers/char/tpm/tpm-dev-common.c |  45 ++++-
 drivers/char/tpm/tpm-interface.c  | 262 ++++++------------------------
 drivers/char/tpm/tpm-sysfs.c      | 141 +++++++++-------
 drivers/char/tpm/tpm.h            |  37 ++---
 drivers/char/tpm/tpm1-cmd.c       |  28 +---
 drivers/char/tpm/tpm2-cmd.c       |  68 +++-----
 drivers/char/tpm/tpm2-space.c     |  87 +++++++---
 drivers/char/tpm/tpm_vtpm_proxy.c |   4 +-
 9 files changed, 382 insertions(+), 395 deletions(-)

Comments

Stefan Berger Nov. 6, 2018, 3:25 p.m. UTC | #1

On 11/4/18 8:45 PM, Jarkko Sakkinen wrote:
> Remove @space from tpm_transmit() API` in order to completely remove the
> bound between low-level transmission functionality and TPM spaces. The
> only real dependency existing is the amount of data saved before trying
> to send a command to the TPM.
>
> It doesn't really matter if we save always a bit more than needed so
> this commit changes the amount saved always to be the size of the TPM
> header and three handles.
>
> Signed-off-by: Jarkko Sakkinen <[e-mail]>


This patch only removes a dead parameter from API calls:

Reviewed-by: Stefan Berger <[e-mail]>