From: Jarkko Sakkinen <jarkko@kernel.org>
To: Arun Menon <armenon@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org,
Peter Huewe <peterhuewe@gmx.de>, Jason Gunthorpe <jgg@ziepe.ca>
Subject: Re: [PATCH v4 5/6] tpm: Increase TPM_BUFSIZE to 8kB for chunking support
Date: Sun, 25 Oct 2026 22:59:05 +0200 [thread overview]
Message-ID: <at5tmTYX7ZjO_Q2m@kernel.org> (raw)
In-Reply-To: <20261025201859.221991-6-armenon@redhat.com>
On Mon, Oct 26, 2026 at 01:48:57AM +0530, Arun Menon wrote:
> From: Arun Menon <armenon@redhat.com>
>
> The size of the command is checked against TPM_BUFSIZE early on before
> even sending it to the backend. We therefore need to increase the
> TPM_BUFSIZE to allow support for larger commands.
>
> For now, 8KB seems sufficient for ML-KEM and ML-DSA algorithms and it is
> also order-1 safe.
>
> Signed-off-by: Arun Menon <armenon@redhat.com>
In what timeline? Or is it out of spectrum timeline?
> ---
> include/linux/tpm_command.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/tpm_command.h b/include/linux/tpm_command.h
> index fc446a1282e2..4ad11068b090 100644
> --- a/include/linux/tpm_command.h
> +++ b/include/linux/tpm_command.h
> @@ -434,7 +434,7 @@ struct tpm2_context {
> */
>
> #define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
> -#define TPM_BUFSIZE 4096
> +#define TPM_BUFSIZE 8192
>
> /*
> * SHA-512 is, as of today, the largest digest in the TCG algorithm repository.
> --
> 2.54.0
>
Br, Jarkko
next prev parent reply other threads:[~2026-10-25 20:59 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-25 20:18 [PATCH v4 0/6] tpm_crb: Add command and response buffer " Arun Menon
2026-10-25 20:18 ` [PATCH v4 1/6] tpm_crb: Add register definitions of TPM CRB chunking fields Arun Menon
2026-10-25 20:18 ` [PATCH v4 2/6] tpm_crb: Split start method into a separate header Arun Menon
2026-10-25 20:55 ` Jarkko Sakkinen
2026-10-25 20:56 ` Jarkko Sakkinen
2026-10-25 20:18 ` [PATCH v4 3/6] tpm_crb: Add start_cmd parameter to tpm_crb_start wrapper Arun Menon
2026-10-25 20:18 ` [PATCH v4 4/6] tpm: tis_i2c: Use local 4KB buffer to limit memory usage Arun Menon
2026-10-25 20:18 ` [PATCH v4 5/6] tpm: Increase TPM_BUFSIZE to 8kB for chunking support Arun Menon
2026-10-25 20:59 ` Jarkko Sakkinen [this message]
2026-10-25 21:00 ` Jarkko Sakkinen
2026-10-25 20:18 ` [PATCH v4 6/6] tpm_crb: Implement command and response chunking logic Arun Menon
2026-10-25 21:59 ` Jarkko Sakkinen
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