On Mon, Jul 11, 2022 at 04:52:11AM +0200, Jarkko Sakkinen wrote:
> 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.
Hi!
Sorry, I don't know why it looks like that. The patch looks fine as far
as I can see. I will resend it again.
Kind regards
Mårten
>
> > 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
