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:tweek@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 > 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//pcrs file present (I am on CentOS 7.3) Thoughts? Thanks, Kam ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ tpmdd-devel mailing list tpmdd-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/tpmdd-devel