linux-kernel - Re: [PATCH] tpm: ibmvtpm: Call tpm2_sessions

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Date: Mon, 17 Jun 2024 15:42:32 -0400
From: James Bottomley <James.Bottomley@...senPartnership.com>
To: Stefan Berger <stefanb@...ux.ibm.com>, linux-integrity@...r.kernel.org, 
	linuxppc-dev@...ts.ozlabs.org, jarkko@...nel.org
Cc: linux-kernel@...r.kernel.org, mpe@...erman.id.au, 
	naveen.n.rao@...ux.ibm.com
Subject: Re: [PATCH] tpm: ibmvtpm: Call tpm2_sessions_init() to initialize
 session support

On Mon, 2024-06-17 at 15:34 -0400, Stefan Berger wrote:
> Fix the following type of error message caused by a missing call to
> tpm2_sessions_init() in the IBM vTPM driver:
> 
> [    2.987131] tpm tpm0: tpm2_load_context: failed with a TPM error
> 0x01C4
> [    2.987140] ima: Error Communicating to TPM chip, result: -14
> 
> Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation")
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> ---
>  drivers/char/tpm/tpm_ibmvtpm.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/char/tpm/tpm_ibmvtpm.c
> b/drivers/char/tpm/tpm_ibmvtpm.c
> index d3989b257f42..1e5b107d1f3b 100644
> --- a/drivers/char/tpm/tpm_ibmvtpm.c
> +++ b/drivers/char/tpm/tpm_ibmvtpm.c
> @@ -698,6 +698,10 @@ static int tpm_ibmvtpm_probe(struct vio_dev
> *vio_dev,
>                 rc = tpm2_get_cc_attrs_tbl(chip);
>                 if (rc)
>                         goto init_irq_cleanup;
> +
> +               rc = tpm2_sessions_init(chip);
> +               if (rc)
> +                       goto init_irq_cleanup;

This looks wrong: the whole thing is designed to occur in the bootstrap
phase from tpm_chip_register() (which tpm_ibmvtpm.c definitely calls),
so why isn't it happening?

James