Merge branch 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull tpm updates from James Morris:

 - Clean up the transmission flow

   Cleaned up the whole transmission flow. Locking of the chip is now
   done in the level of tpm_try_get_ops() and tpm_put_ops() instead
   taking the chip lock inside tpm_transmit(). The nested calls inside
   tpm_transmit(), used with the resource manager, have been refactored
   out.

   Should make easier to perform more complex transactions with the TPM
   without making the subsystem a bigger mess (e.g. encrypted channel
   patches by James Bottomley).

 - PPI 1.3 support

   TPM PPI 1.3 introduces an additional optional command parameter that
   may be needed for some commands. Display the parameter if the command
   requires such a parameter. Only command 23 (SetPCRBanks) needs one.

   The PPI request file will show output like this then:

      # echo "23 16" > request
      # cat request
      23 16

      # echo "5" > request
      # cat request
      5

 - Extend all PCR banks in IMA

   Instead of static PCR banks array, the array of available PCR banks
   is now allocated dynamically. The digests sizes are determined
   dynamically using a probe PCR read without relying crypto's static
   list of hash algorithms.

   This should finally make sealing of measurements in IMA safe and
   secure.

 - TPM 2.0 selftests

   Added a test suite to tools/testing/selftests/tpm2 previously outside
   of the kernel tree: https://github.com/jsakkine-intel/tpm2-scripts

* 'next-tpm' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (37 commits)
  tpm/ppi: Enable submission of optional command parameter for PPI 1.3
  tpm/ppi: Possibly show command parameter if TPM PPI 1.3 is used
  tpm/ppi: Display up to 101 operations as define for version 1.3
  tpm/ppi: rename TPM_PPI_REVISION_ID to TPM_PPI_REVISION_ID_1
  tpm/ppi: pass function revision ID to tpm_eval_dsm()
  tpm: pass an array of tpm_extend_digest structures to tpm_pcr_extend()
  KEYS: trusted: explicitly use tpm_chip structure from tpm_default_chip()
  tpm: move tpm_chip definition to include/linux/tpm.h
  tpm: retrieve digest size of unknown algorithms with PCR read
  tpm: rename and export tpm2_digest and tpm2_algorithms
  tpm: dynamically allocate the allocated_banks array
  tpm: remove @flags from tpm_transmit()
  tpm: take TPM chip power gating out of tpm_transmit()
  tpm: introduce tpm_chip_start() and tpm_chip_stop()
  tpm: remove TPM_TRANSMIT_UNLOCKED flag
  tpm: use tpm_try_get_ops() in tpm-sysfs.c.
  tpm: remove @space from tpm_transmit()
  tpm: move TPM space code out of tpm_transmit()
  tpm: move tpm_validate_commmand() to tpm2-space.c
  tpm: clean up tpm_try_transmit() error handling flow
  ...

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/char/tpm/tpm_ibmvtpm.c b/drivers/char/tpm/tpm_ibmvtpm.c
index 07b5a487d0c8..757ca45b39b8 100644
--- a/drivers/char/tpm/tpm_ibmvtpm.c
+++ b/drivers/char/tpm/tpm_ibmvtpm.c
@@ -139,14 +139,14 @@ static int tpm_ibmvtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 }
 
 /**
- * tpm_ibmvtpm_send - Send tpm request
- *
+ * tpm_ibmvtpm_send() - Send a TPM command
  * @chip:	tpm chip struct
  * @buf:	buffer contains data to send
  * @count:	size of buffer
  *
  * Return:
- *	Number of bytes sent or < 0 on error.
+ *   0 on success,
+ *   -errno on error
  */
 static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 {
@@ -192,7 +192,7 @@ static int tpm_ibmvtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
 		rc = 0;
 		ibmvtpm->tpm_processing_cmd = false;
 	} else
-		rc = count;
+		rc = 0;
 
 	spin_unlock(&ibmvtpm->rtce_lock);
 	return rc;