TPM2 Problem in 6.2.0 kernel

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I'm also seeing TPM2.0 issue with kernel 6.2.0-39, 6.2.0-37 works fine.

User@zenbookneo:~$ sudo tpm2_nvread 0x1500016

ERROR:tcti:src/tss2-tcti/tcti-device.c:452:Tss2_Tcti_Device_Init() Failed to open specified TCTI device file /dev/tpmrm0: No such file or directory

ERROR:tcti:src/tss2-tcti/tctildr-dl.c:154:tcti_from_file() Could not initialize TCTI file: libtss2-tcti-device.so.0

ERROR:tcti:src/tss2-tcti/tcti-device.c:452:Tss2_Tcti_Device_Init() Failed to open specified TCTI device file /dev/tpm0: No such file or directory

ERROR:tcti:src/tss2-tcti/tctildr-dl.c:154:tcti_from_file() Could not initialize TCTI file: libtss2-tcti-device.so.0

WARNING:tcti:src/util/io.c:262:socket_connect() Failed to connect to host 127.0.0.1, port 2321: errno 111: Connection refused

ERROR:tcti:src/tss2-tcti/tcti-swtpm.c:614:Tss2_Tcti_Swtpm_Init() Cannot connect to swtpm TPM socket

ERROR:tcti:src/tss2-tcti/tctildr-dl.c:154:tcti_from_file() Could not initialize TCTI file: libtss2-tcti-swtpm.so.0

WARNING:tcti:src/util/io.c:262:socket_connect() Failed to connect to host 127.0.0.1, port 2321: errno 111: Connection refused

ERROR:tcti:src/tss2-tcti/tctildr-dl.c:154:tcti_from_file() Could not initialize TCTI file: libtss2-tcti-mssim.so.0

ERROR:tcti:src/tss2-tcti/tctildr-dl.c:254:tctildr_get_default() No standard TCTI could be loaded

ERROR:tcti:src/tss2-tcti/tctildr.c:428:Tss2_TctiLdr_Initialize_Ex() Failed to instantiate TCTI

ERROR: Could not load tcti, got: "(null)"

Status changed to 'Confirmed' because the bug affects multiple users.

unfortunately i also have to confirm the problem, we have several headless computers in the field that we cannot restart without deleting the kernel first.

Otherwise the automatic decryption will not work.

These are computers with Intel CPUs.

i estimate the problem to be very big, several devices are affected

there seems to be a fix in the kernel with this commit

https://github.com/torvalds/linux/commit/8f7f35e5aa6f2182eabcfa3abef4d898a48e9aa8

The error message I get is slightly different:

"
tpm_crb: probe of MSFT0101:00 failed with error 378
"

As https://bugs.launchpad.net/bugs/2047692 was marked as duplicate of this ticket I'll add my original comment here, too - sorry if this breaks launchpad's rules.

6.2.0-39.40~22.04.1 includes upstream stable patchset 2023-10-10 (https://launchpad.net/bugs/2038969) with the TPM changes 'Disable RNG for all AMD fTPMs' and 'Add a helper for checking hwrng enabled'.

This causes on some Intel devices that TPM does not work (in my case a Gigabyte Brix GB-BSi5-1135G7).

Upstream discussed this issue in https://bugzilla.kernel.org/show_bug.cgi?id=217804 and a fix was found: https://github.com/torvalds/linux/commit/8f7f35e5aa6f2182eabcfa3abef4d898a48e9aa8 (already linked by ~badsmoke in an earlier comment)

It seems to be fixed in the new kernal 6.5.0-14-generic.

I can confirm it is fixed.

User@zenbookneo:~$ uname -a
Linux zenbookneo 6.5.0-14-generic #14~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Nov 20 18:15:30 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

User@zenbookneo:~$ sudo tpm2_nvread 0x1500016
WARN: Reading full size of the NV index
*redacted*
User@zenbookneo:~$