Thank you Nayna for getting back to me, yes I am using ACPI so that would
explain it.
Which brings me to my last issue, I am not seeing the PCRS file in either of
these locations:
/sys/devices/pnp0/<pnp#>/pcrs
/sys/devices/platform/tpm_tis/pcrs
I am loading TPM as kernel modules so is this behavior not supported when TPM
is not built-in, or are these files specific to TPM 1.2?
Thanks,
Kam
From: Nayna Jain [mailto:na...@linux.vnet.ibm.com]
Sent: Wednesday, September 13, 2017 8:04 AM
To: Nasim, Kam; tpmdd-devel@lists.sourceforge.net
Subject: Re: [tpmdd-devel] TPM2.0: No binary_bios_measurements file in
securityFS
On 09/12/2017 04:14 AM, Nasim, Kam 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:
TPM 2.0 binary_bios_measurements event log file support is currently not
available for ACPI based platform. It is only for device tree based platform.
And I think you are using ACPI.
Thanks & Regards,
- Nayna
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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