aeaac9a289
If the ceck for the ACPI TPM2 table did not work we currently check if the EFI TPM table exists to check if the firmware supports TPM2. Specifically we check if /sys/kernel/security/tpm0/binary_bios_measurements exists. But that's not enough, since that also exists on TPM1.2 systems. Hence, let's also check /sys/class/tpm/tpm0/tpm_version_major which should exist under similar conditions and tells us the kernel's idea of the TPM version in use. I originally intended to read the signature of the /sys/kernel/security/tpm0/binary_bios_measurements contents for this, but this is not ideal since that file has tight access mode, and our TPM availability check would thus not work anymore if invoked unpriv. Follow-up for 4b3391158197e9158cc754e56bbeaf94e2fd8395 Fixes: #33077
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