linux-kernel - Re: [PATCH v4 1/2] fTPM: firmware TPM running in TEE

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Date:   Tue, 4 Jun 2019 16:09:51 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Sumit Garg <sumit.garg@...aro.org>
Cc:     peterhuewe@....de,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        jgg@...pe.ca, corbet@....net,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-doc@...r.kernel.org, linux-integrity@...r.kernel.org,
        Microsoft Linux Kernel List <linux-kernel@...rosoft.com>,
        Thirupathaiah Annapureddy <thiruan@...rosoft.com>,
        "Bryan Kelly (CSI)" <bryankel@...rosoft.com>,
        tee-dev@...ts.linaro.org
Subject: Re: [PATCH v4 1/2] fTPM: firmware TPM running in TEE

On Tue, Jun 04, 2019 at 11:45:52AM +0530, Sumit Garg wrote:
>On Thu, 30 May 2019 at 20:58, Sasha Levin <sashal@...nel.org> wrote:
>> +       /* Open context with TEE driver */
>> +       pvt_data->ctx = tee_client_open_context(NULL, ftpm_tee_match, NULL,
>> +                                               NULL);
>> +       if (IS_ERR(pvt_data->ctx)) {
>> +               dev_err(dev, "%s:tee_client_open_context failed\n", __func__);
>
>Is this well tested? I see this misleading error multiple times as
>follows although TEE driver works pretty well.

Yes, this was all functionally tested.

Why is this error message misleading? I'd be happy to fix it.

>Module built with "CONFIG_TCG_FTPM_TEE=y"
>
>[    1.436878] ftpm-tee tpm@0: ftpm_tee_probe:tee_client_open_context failed
>[    1.509471] ftpm-tee tpm@0: ftpm_tee_probe:tee_client_open_context failed
>[    1.517268] ftpm-tee tpm@0: ftpm_tee_probe:tee_client_open_context failed
>[    1.525596] ftpm-tee tpm@0: ftpm_tee_probe:tee_client_open_context failed

Does the TEE have the fTPM implementation and such? Could you provide
details about your testing environment (hardware, fTPM verions, etc)?

--
Thanks,
Sasha