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SubjectRe: [PATCH] KEYS: trusted: allow module init if TPM is inactive or deactivated
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
> TPM_ERR_DISABLED errors.

Why allow trusted module to initialize if TPM is not functional?

Also:

err = tpm_transmit_cmd(chip, &buf,
offsetof(struct tpm2_get_random_out,
buffer),
"attempting get random");
if (err) {
if (err > 0)
err = -EIO;
goto out;
}

/Jarkko

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