Re: TPM2.0: No binary_bios_measurements file in securityFS

Hi Kam,

Access to the binary event log for TPM 2.0 is not fully supported. I've
recently sent a patch to implement it: https://lkml.org/lkml/2017/9/11/118

Thanks,
Thiebaud

On Tue, Sep 12, 2017 at 12:44 AM, Nasim, Kam <[email protected]>
wrote:

> Hi folks,
>
>
> I am building my TPM 2.0 driver as Kernel modules (tpm.ko, tpm_tis_core.ko
> and tpm_tis.ko).
>
>
>
> I noticed that while my /sys/kernel/security directory is created and
> mounted to securityFS, it is empty.
>
>
>
> Looking at tpm_bios_log_setup() in tpm1_event.log, I see that this is
> being done during chip registration:
>
>
>
> if (chip->flags & TPM_CHIP_FLAG_TPM2)
>
>         chip->bin_log_seqops.seqops =
>
>             &tpm2_binary_b_measurements_seqops;
>
>     else
>
>         chip->bin_log_seqops.seqops =
>
>             &tpm_binary_b_measurements_seqops;
>
>
>
>
>
>     chip->bios_dir[cnt] =
>
>         securityfs_create_file("binary_bios_measurements",
>
>                    0440, chip->bios_dir[0],
>
>                    (void *)&chip->bin_log_seqops,
>
>                    &tpm_bios_measurements_ops);
>
>     if (IS_ERR(chip->bios_dir[cnt]))
>
>         goto err;
>
>
>
>
>
> My TPM modules are loaded properly and I can interact with TPM using
> userspace TSS2 applications:
>
>
>
> $ sudo lsmod | grep tpm
>
> Password:
>
> tpm_crb                 6458  0
>
> tpm_tis                 5950  0
>
> tpm_tis_core           10054  1 tpm_tis
>
> tpm                    48093  3 tpm_crb,tpm_tis,tpm_tis_core
>
>
>
>
>
> 2017-09-08T19:39:16.239 controller-0 kernel: warning [    0.000000] ACPI:
> TPM2 000000007b7c8000 00034 (v03 INTEL   S2600WT 00000002 INTL 01000013)
>
> 2017-09-08T19:39:16.252 controller-0 kernel: info [    5.457568] tpm_tis
> MSFT0101:00: 2.0 TPM (device-id 0x1A, rev-id 16)
>
>
>
>
>
> How and when would this file be created? For that matter I don’t even have
> a /sys/devices/pnp0/<pnp#>/pcrs file present
>
> (I am on CentOS 7.3)
>
>
>
>
>
> Thoughts?
>
>
>
> Thanks,
>
> Kam
>
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