Thanks Thiebaud. I am going to apply your patch and give it a go.
So just to confirm, did /sys/kernel/security/tpm0/binary_bios_measurements
never worked for TPM 2.0? I am using a grub bootloader btw (not UEFI or any
other form of Secure / Trusted boot)
From: Thiebaud Weksteen [mailto:tw...@google.com]
Sent: Tuesday, September 12, 2017 2:41 AM
To: Nasim, Kam
Cc: tpmdd-devel@lists.sourceforge.net
Subject: Re: [tpmdd-devel] 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
<kam.na...@windriver.com<mailto:kam.na...@windriver.com>> 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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