4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Javier Martinez Canillas javierm@redhat.com
[ Upstream commit 0d6d0d62d9505a9816716aa484ebd0b04c795063 ]
For TPM 1.2 chips the system setup utility allows to set the TPM device in one of the following states:
* Active: Security chip is functional * Inactive: Security chip is visible, but is not functional * Disabled: Security chip is hidden and is not functional
When choosing the "Inactive" state, the TPM 1.2 device is enumerated and registered, but sending TPM commands fail with either TPM_DEACTIVATED or TPM_DISABLED depending if the firmware deactivated or disabled the TPM.
Since these TPM 1.2 error codes don't have special treatment, inactivating the TPM leads to a very noisy kernel log buffer that shows messages like the following:
tpm_tis 00:05: 1.2 TPM (device-id 0x0, rev-id 78) tpm tpm0: A TPM error (6) occurred attempting to read a pcr value tpm tpm0: TPM is disabled/deactivated (0x6) tpm tpm0: A TPM error (6) occurred attempting get random tpm tpm0: A TPM error (6) occurred attempting to read a pcr value ima: No TPM chip found, activating TPM-bypass! (rc=6) tpm tpm0: A TPM error (6) occurred attempting get random tpm tpm0: A TPM error (6) occurred attempting get random tpm tpm0: A TPM error (6) occurred attempting get random tpm tpm0: A TPM error (6) occurred attempting get random
Let's just suppress error log messages for the TPM_{DEACTIVATED,DISABLED} return codes, since this is expected when the TPM 1.2 is set to Inactive.
In that case the kernel log is cleaner and less confusing for users, i.e:
tpm_tis 00:05: 1.2 TPM (device-id 0x0, rev-id 78) tpm tpm0: TPM is disabled/deactivated (0x6) ima: No TPM chip found, activating TPM-bypass! (rc=6)
Reported-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Javier Martinez Canillas javierm@redhat.com Reviewed-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/char/tpm/tpm-interface.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -415,7 +415,8 @@ ssize_t tpm_transmit_cmd(struct tpm_chip header = cmd;
err = be32_to_cpu(header->return_code); - if (err != 0 && desc) + if (err != 0 && err != TPM_ERR_DISABLED && err != TPM_ERR_DEACTIVATED + && desc) dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err, desc);