linux-kernel - Re: [PATCH v7 1/2] fTPM: firmware TPM running in TEE

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Date:   Wed, 3 Jul 2019 11:12:28 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Thirupathaiah Annapureddy <thiruan@...rosoft.com>
Cc:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>,
        "peterhuewe@....de" <peterhuewe@....de>,
        "jgg@...pe.ca" <jgg@...pe.ca>, "corbet@....net" <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        Microsoft Linux Kernel List <linux-kernel@...rosoft.com>,
        "Bryan Kelly (CSI)" <bryankel@...rosoft.com>,
        "tee-dev@...ts.linaro.org" <tee-dev@...ts.linaro.org>,
        "sumit.garg@...aro.org" <sumit.garg@...aro.org>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        Joakim Bech <joakim.bech@...aro.org>
Subject: Re: [PATCH v7 1/2] fTPM: firmware TPM running in TEE

Hi Thirupathaiah,

(+Joakim)

On Wed, 3 Jul 2019 at 09:58, Ilias Apalodimas
<ilias.apalodimas@...aro.org> wrote:
>
> Hi Thirupathaiah,
> >
> > First of all, Thanks a lot for trying to test the driver.
> >
> np
>
> [...]
> > > I managed to do some quick testing in QEMU.
> > > Everything works fine when i build this as a module (using IBM's TPM 2.0
> > > TSS)
> > >
> > > - As module
> > > # insmod /lib/modules/5.2.0-rc1/kernel/drivers/char/tpm/tpm_ftpm_tee.ko
> > > # getrandom -by 8
> > > randomBytes length 8
> > > 23 b9 3d c3 90 13 d9 6b
> > >
> > > - Built-in
> > > # dmesg | grep optee
> > > ftpm-tee firmware:optee: ftpm_tee_probe:tee_client_open_session failed,
> > > err=ffff0008
> > This (0xffff0008) translates to TEE_ERROR_ITEM_NOT_FOUND.
> >
> > Where is fTPM TA located in the your test setup?
> > Is it stitched into TEE binary as an EARLY_TA or
> > Is it expected to be loaded during run-time with the help of user mode OP-TEE supplicant?
> >
> > My guess is that you are trying to load fTPM TA through user mode OP-TEE supplicant.
> > Can you confirm?
> I tried both
>

Ok apparently there was a failure with my built-in binary which i
didn't notice. I did a full rebuilt and checked the elf this time :)

Built as an earlyTA my error now is:
ftpm-tee firmware:optee: ftpm_tee_probe:tee_client_open_session
failed, err=ffff3024 (translates to TEE_ERROR_TARGET_DEAD)
Since you tested it on real hardware i guess you tried both
module/built-in. Which TEE version are you using?

Thanks
/Ilias