linux-kernel - Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

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Date:   Tue, 13 Nov 2018 12:50:45 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Michael Niewöhner <linux@...ewoehner.de>
Cc:     James Bottomley <James.Bottomley@...senPartnership.com>,
        peterhuewe@....de, jgg@...pe.ca, arnd@...db.de,
        linux-integrity@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

On Sun, Nov 11, 2018 at 10:11:33PM +0100, Michael Niewöhner wrote:
> Very strange... When I pull the power cord, then replug and boot, I get these
> dmesg messages:
> [    0.000000] efi:  ACPI
> 2.0=0x9ea78000  ACPI=0x9ea78000  SMBIOS=0x9f5e5000  SMBIOS
> 3.0=0x9f5e4000  MPS=0xfca00  ESRT=0x9c06e918  MEMATTR=0x99cb9018  TPMEventLog=0x
> 98d0c018 
> [    0.001794] ACPI: TPM2 0x000000009EAB1F70 000034 (v03 LENOVO TC-
> S06   00001260 AMI  00000000)
> [    3.096587] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 2)
> [    3.105684] tpm tpm0: A TPM error (2314) occurred attempting the self test
> 
> After a reboot I get those "ima: ..." message again. Pulling the plug seems to
> reset anything (the TPM).
> 
> The PTT TPM 2.0 shows exactly the same behaviour.

The error in question is TPM_RC_TESTING i.e. TPM is still processing
selftests in the background.

It is clearly a regression but unfortanely it is harmless and unrelated
i.e. tpm2_do_selftest() should not print an error message because it
is legit behavior.

The function actually masks the whole error:

	if (rc == TPM2_RC_TESTING)
		rc = TPM2_RC_SUCCESS;

/Jarkko