TPM2.0: No binary_bios_measurements file in securityFS

From: "Nasim, Kam" <Kam.Nasim-CWA4WttNNZF54TAoqtyWWQ@public.gmane.org>
To: "tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org"
	<tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: TPM2.0: No binary_bios_measurements file in securityFS
Date: Mon, 11 Sep 2017 22:44:02 +0000	[thread overview]
Message-ID: <CA352AD04C14CE4985F6AEB6AB8C130E3EDB8751@ALA-MBC.corp.ad.wrs.com> (raw)

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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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