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

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Date:   Sun, 25 Nov 2018 21:06:14 +0100
From:   Michael Niewöhner <linux@...ewoehner.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        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>,
        Nayna Jain <nayna@...ux.ibm.com>
Subject: Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

Hi,

On Mon, 2018-11-19 at 15:49 +0200, Jarkko Sakkinen wrote:
> On Sun, Nov 18, 2018 at 03:10:06PM +0100, Michael Niewöhner wrote:
> > On Sun, 2018-11-18 at 10:18 +0200, Jarkko Sakkinen wrote:
> > > On Fri, Nov 16, 2018 at 10:06:28PM +0100, Michael Niewöhner wrote:
> > > > On Wed, 2018-11-14 at 21:46 +0100, Michael Niewöhner wrote:
> > > > > Hi all,
> > > > > 
> > > > > I tried that patch mentioned by Mimi but it does not change anything
> > > > > for
> > > > > me.
> > > > > 
> > > > > Then I did some more tests with different kernel configs and finally
> > > > > got
> > > > > TPM
> > > > > working by
> > > > > a) compiling TPM as modules and rmmod tpm* and re-modprobe tpm_tis.
> > > > > 
> > > > > (initramfs) dmesg | grep -i tpm
> > > > > [    0.000000] efi:  ACPI 2.0=0x9ea7e000 ACPI=0x9ea7e000
> > > > > SMBIOS=0x9f5eb000
> > > > > SMBIOS 3.0=0x9f5ea000 ESRT=0x9c07d918 MEMATTR=0x9bea3018
> > > > > TPMEventLog=0x97cbb018
> > > > > [    0.003793] ACPI: TPM2 0x000000009EAB7F70 000034 (v03 LENOVO TC-
> > > > > S06   00001260 AMI 00000000)
> > > > > (initramfs) rmmod tpm_crb tpm_tis tpm_tis_core tpm
> > > > > (initramfs) modprobe tpm_tis
> > > > > [   44.956905] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 2)
> > > > > 
> > > > > b) compiling TPM-support in-kernel and manually bind the ACPI device
> > > > > 
> > > > > (initramfs) dmesg | grep -i tpm
> > > > > [    0.000000] efi: ACPI 2.0=0x9ea7e000 ACPI=0x9ea7e000
> > > > > SMBIOS=0x9f5eb000
> > > > > SMBIOS
> > > > > 3.0=0x9f5ea000 ESRT=0x9c07d918 MEMATTR=0x9bea3018
> > > > > TPMEventLog=0x97cbb018
> > > > > [    0.003546] ACPI: TPM2 0x000000009EAB7F70 000034 (v03 LENOVO TC-S06
> > > > > 00001260
> > > > > AMI 00000000)
> > > > > (initramfs) echo MSFT0101:00 >/sys/bus/platform/drivers/tpm_tis/bind
> > > > > [  233.076079] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 2)
> > > > > 
> > > > > 
> > > > > It seems to me, the kernel tries to enable the TPM to early...
> > > > > 
> > > > > 
> > > > > Michael
> > > > 
> > > > Looks like the manual driver bind works more or less but e.g reading
> > > > hwrng
> > > > does
> > > > not work...
> > > > 
> > > > # echo MSFT0101:00 >/sys/bus/platform/drivers/tpm_tis/bind
> > > > [  148.293302] tpm_tis MSFT0101:00: 2.0 TPM (device-id 0xFE, rev-id 2)
> > > > # cat /sys/devices/virtual/misc/hw_random/rng_current
> > > > tpm-rng-0
> > > > # cat /dev/hwrng >/dev/null 
> > > > cat: /dev/hwrng: Operation not permitted
> > > 
> > > Can you check with trace-cmd start -p function -l 'tpm*'?
> > > 
> > > /Jarkko
> > 
> > 
> > Hi Jarko,
> > 
> > what output do you need exactly?
> 
> TPM gets added with tpm_add_hwrng() and the callback that is called by
> hwrng subsystem is tpm_hwrng_read().
> 
> Obviously the former gets called (can be seen from the sysfs file). Just
> wondering if it ever reaches tpm_hwrng_read().
> 
> /Jarkko

I wanted to be sure that there is no hardware failure so I tested the TPM in
UEFI Shell using the tpm tools from github.com/fpmurphy/UEFI-Utilities-2016

I can confirm that it is working there in both modes 1.2 and 2.0.


FS0:\> ShowTPM2.efi

           Signature : TPM2
              Length : 52
            Revision : 3
            Checksum : 167
              Oem ID : LENOVO
        Oem Table ID : TC-S06  
        Oem Revision : 4704
          Creator ID : AMI 
    Creator Revision : 0
      Platform Class : 0
Control Area Address : 0
        Start Method : 6 (Memory mapped I/O)
  Platform S.P. Size : 0

FS0:\> ShowTCM20.efi
          Structure Version: 1.1
           Protocol Version: 1.1
  Supported Hash Algorithms: SHA1 SHA256 
Supported Event Log Formats: TCG_1.2 TCG_2 
           TPM Present Flag: True
       Maximum Command Size: 2048
      Maximum Response Size: 2048
             Manufactuer ID: NTC
       Number of PCR Banks: 2

FS0:\> ShowPCR20.efi

Bank (Algorithm): TPM_ALG_SHA1 (0x0004)

[00]  1E BB 2B E3 B7 10 3A 09 B5 CA EE B5 82 7C 12 42 CD 66 32 EC
[01]  80 4E 8E 47 19 9D C7 31 4E B4 3C 4D C9 58 EF 6F 0B 6B 49 62
[02]  B2 A8 3B 0E BF 2F 83 74 29 9A 5B 2B DF C3 1E A9 55 AD 72 36
[03]  B2 A8 3B 0E BF 2F 83 74 29 9A 5B 2B DF C3 1E A9 55 AD 72 36
....
......



Michael