linux-kernel - Re: tpm_tis TPM2.0 not detected on cold boot

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Message-ID: <5aa2fc082b6b0657574918b025005ad569da6412.camel@mniewoehner.de>
Date:   Thu, 03 Jan 2019 16:47:31 +0100
From:   Michael Niewöhner <linux@...ewoehner.de>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     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>,
        Ken Goldman <kgold@...ux.ibm.com>
Subject: Re: tpm_tis TPM2.0 not detected on cold boot

On Thu, 2019-01-03 at 17:04 +0200, Jarkko Sakkinen wrote:
> On Thu, Jan 03, 2019 at 02:38:11PM +0100, Michael Niewöhner wrote:
> > On Thu, 2019-01-03 at 15:27 +0200, Jarkko Sakkinen wrote:
> > > On Sun, Dec 23, 2018 at 12:55:12PM +0100, Michael Niewöhner wrote:
> > > > There is another issue but I don't know if both are related. Maybe
> > > > that's
> > > > just a
> > > > timing issue...
> > > > 
> > > > root@...ian:~# dd if=/dev/hwrng bs=1 count=1
> > > > dd: error reading '/dev/hwrng': Operation not permitted
> > > > 0+0 records in
> > > > 0+0 records out
> > > > 0 bytes copied, 0.755958 s, 0.0 kB/s
> > > > root@...ian:~# dd if=/dev/hwrng bs=1 count=1 | xxd; dd if=/dev/hwrng
> > > > bs=1
> > > > count=1 | xxd
> > > > dd: error reading '/dev/hwrng': Operation not permitted
> > > > 0+0 records in
> > > > 0+0 records out
> > > > 0 bytes copied, 0.755697 s, 0.0 kB/s
> > > > 1+0 records in
> > > > 1+0 records out
> > > > 00000000: 52                                       R
> > > > 1 byte copied, 0.0106268 s, 0.1 kB/s
> > > > 
> > > > 
> > > > Michael
> > > 
> > > What does /sys/devices/virtual/misc/hw_random/rng_current show?
> > > 
> > > Did run commands as a sanity check on my laptop and seem to work.
> > > 
> > > /Jarkko
> > 
> > rng_current says "tpm-rng-0", which should be correct
> 
> Is /dev/tpm0 accessible and usable?
> 
> /Jarkko

No, it does not seem to work:

root@...ian:~# tpm_version                                     
Tspi_Context_Connect failed: 0x00003011 - layer=tsp, code=0011 (17),
Communication failure
root@...ian:~# tcsd -f
TCSD TDDL ioctl: (25) Inappropriate ioctl for device
TCSD TDDL Falling back to Read/Write device support.
TCSD TDDL ERROR: write to device /dev/tpm0 failed: Operation not permitted
TCSD TCS ERROR: TCS GetCapability failed with result = 0x1087
root@...ian:~# stat /dev/tpm0
  File: /dev/tpm0
  Size: 0         	Blocks: 0          IO Block: 4096   character special
file
Device: 6h/6d	Inode: 1114        Links: 1     Device type: a,e0
Access: (0600/crw-------)  Uid: (  104/     tss)   Gid: (  112/     tss)
Access: 2019-01-03 16:39:20.627635333 +0100
Modify: 2019-01-03 16:39:20.627635333 +0100
Change: 2019-01-03 16:39:20.627635333 +0100
 Birth: -

Michael