On Tue, Jul 05, 2022 at 03:24:23PM +0200, M??rten Lindahl wrote:
> In commit 0aa698787aa2 ("tpm: Add Upgrade/Reduced mode support for
> TPM2 modules") it was said that:
>
> "If the TPM is in Failure mode, it will successfully respond to both
> tpm2_do_selftest() and tpm2_startup() calls. Although, will fail to
> answer to tpm2_get_cc_attrs_tbl(). Use this fact to conclude that TPM
> is in Failure mode."
>
> But a check was never added in the commit when calling
> tpm2_get_cc_attrs_tbl() to conclude that the TPM is in Failure mode.
> This commit corrects this by adding a check.
>
> Fixes: 0aa698787aa2 ("tpm: Add Upgrade/Reduced mode support for TPM2 modules")
> Cc: stable@xxxxxxxxxxxxxxx # v5.17+
> Signed-off-by: M??rten Lindahl <marten.lindahl@xxxxxxxx>
The characters here are messed up.
> Reviewed-by: Jarkko Sakkinen <jarkko@xxxxxxxxxx>
> ---
>
> v3:
> - Add Jarkkos Reviewed-by tag.
> - Add Fixes tag and Cc.
>
> v2:
> - Add missed check for TPM error code.
>
> drivers/char/tpm/tpm2-cmd.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c
> index c1eb5d223839..65d03867e114 100644
> --- a/drivers/char/tpm/tpm2-cmd.c
> +++ b/drivers/char/tpm/tpm2-cmd.c
> @@ -752,6 +752,12 @@ int tpm2_auto_startup(struct tpm_chip *chip)
> }
>
> rc = tpm2_get_cc_attrs_tbl(chip);
> + if (rc == TPM2_RC_FAILURE || (rc < 0 && rc != -ENOMEM)) {
> + dev_info(&chip->dev,
> + "TPM in field failure mode, requires firmware upgrade\n");
> + chip->flags |= TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
> + rc = 0;
> + }
>
> out:
> /*
> --
> 2.30.2
>
BR, Jarkko
