TPM reports it's locked when trying to clear

[thomas-zimmerman]

• Model: galp7
• BIOS version: 2023-09-08_42bf7a6
• EC version: 2023-09-08_42bf7a6
• OS: Pop!OS 22.04
• Kernel: 6.5.6

Trying to clear the TPM with tpm2_clear we get a TPM error:

ERROR: esys:src/tss2-esys/api/Esys_Clear:c97:Esys_Clear() Esys Finish ErrorCode (0x00000921)
ERROR: Esys_Clear(0x921) - tpm:warn(2.0): authorizations for objects subject to DA protection are not allowed at this time because the TPM is in DA lockout mode
ERROR: Unable to run tpm2_clear

Steps to reproduce

sudo apt install tpm2-tools
sudo tpm2_clear

Expected behavior

We expect to have the TPM cleared for setting up new keys for LUKS or BitLocker use.

[ahoneybun]

Running this on a lemp12 with firmware build 2023-09-08_42bf7a6 gives me this output:

WARNING:esys:src/tss2-esys/api/Esys_Clear.c:291:Esys_Clear_Finish() Received TPM Error 
ERROR:esys:src/tss2-esys/api/Esys_Clear.c:97:Esys_Clear() Esys Finish ErrorCode (0x0000098e) 
ERROR: Esys_Clear(0x98E) - tpm:session(1):the authorization HMAC check failed and DA counter incremented
ERROR: Unable to run tpm2_clear

[ahoneybun]

If I run this command I get the lockout mode error like the customer:

tpm2_dictionarylockout --setup-parameters --max-tries=4294967295 --clear-lockout ```

[sun2sirius]

My main working platform is gaze18, which originally faced this issue. I did a bunch of experimenting on it before I saw this, like I ran Win11, built/run open firmware, etc. I though maybe it got into this state in the process. Then I got the galp7 literally out of the box, brand new, and it had the same issue. I wonder if it is possible to get in touch with someone from TPM manufacturer, because I see some other issues that I cannot explain. Thanks!

[duplexsystem]

Try tpm2_clear -c platform for error 0x00000921

[sun2sirius]

Yes, "-c" was the magic switch - thank you!

[TobiPeterG]

Hi there, I get this output:

sudo tpm2_clear -c platform
WARNING:esys:src/tss2-esys/api/Esys_Clear.c:291:Esys_Clear_Finish() Received TPM Error 
ERROR:esys:src/tss2-esys/api/Esys_Clear.c:97:Esys_Clear() Esys Finish ErrorCode (0x000009a2) 
ERROR: Esys_Clear(0x9A2) - tpm:session(1):authorization failure without DA implications
ERROR: Unable to run tpm2_clear

Did I do something wrong?

[thomas-zimmerman]

Clearing the platform is still working for me; what hardware are you on where you got this error?

> sudo tpm2_clear
WARNING:esys:src/tss2-esys/api/Esys_Clear.c:291:Esys_Clear_Finish() Received TPM Error
ERROR:esys:src/tss2-esys/api/Esys_Clear.c:97:Esys_Clear() Esys Finish ErrorCode (0x0000098e)
ERROR: Esys_Clear(0x98E) - tpm:session(1):the authorization HMAC check failed and DA counter incremented
ERROR: Unable to run tpm2_clear
> sudo tpm2_clear -c platform