On Fri, Jul 05, 2019 at 06:37:35PM +0200, Roberto Sassu wrote:
Commit c78719203fc6 ("KEYS: trusted: allow trusted.ko to initialize w/o a
TPM") allows the trusted module to be loaded even a TPM is not found to
avoid module dependency problems.
Unfortunately, this does not completely solve the issue, as there could be
a case where a TPM is found but is not functional (the TPM commands return
an error). Specifically, after the tpm_chip structure is returned by
tpm_default_chip() in init_trusted(), the execution terminates after
init_digests() returns -EFAULT (due to the fact that tpm_get_random()
returns a positive value, but less than TPM_MAX_DIGEST_SIZE).
This patch fixes the issue by ignoring the TPM_ERR_DEACTIVATED and
Why allow trusted module to initialize if TPM is not functional?