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

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Date:   Tue, 2 Jul 2019 17:21:09 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Sasha Levin <sashal@...nel.org>, peterhuewe@....de, jgg@...pe.ca,
        corbet@....net, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-kernel@...rosoft.com, thiruan@...rosoft.com,
        bryankel@...rosoft.com, tee-dev@...ts.linaro.org,
        sumit.garg@...aro.org, rdunlap@...radead.org
Subject: Re: [PATCH v7 1/2] fTPM: firmware TPM running in TEE

Hi,

> On Thu, 2019-06-27 at 16:30 +0300, Ilias Apalodimas wrote:
> > is really useful. I don't have hardware to test this at the moment, but once i
> > get it, i'll give it a spin.
> 
> Thank you for responding, really appreciate it.
> 
No worries
> Please note, however, that I already did my v5.3 PR so there is a lot of
> time to give it a spin. In all cases, we will find a way to put this to
> my v5.4 PR. I don't see any reason why not.
> 
> As soon as the cosmetic stuff is fixed that I remarked in v7 I'm ready
> to take this to my tree and after that soonish make it available on
> linux-next.
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
ftpm-tee: probe of firmware:optee failed with error -22
# getrandom -by 8
random: fast init done
urandom_read: 2 callbacks suppressed
random: getrandom: uninitialized urandom read (32 bytes read)
TSS_Dev_Open: Error opening /dev/tpm0
getrandom: failed, rc 000b0008
TSS_RC_NO_CONNECTION - Failure connecting to lower layer

Am i missing anything?

Thanks
/Ilias