From: Arun Menon <armenon@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Jarkko Sakkinen <jarkko@kernel.org>,
linux-integrity@vger.kernel.org, Peter Huewe <peterhuewe@gmx.de>,
Jason Gunthorpe <jgg@ziepe.ca>, Arun Menon <armenon@redhat.com>
Subject: [RFC v2 4/5] tpm: Increase TPM_BUFSIZE to 8kB for chunking support
Date: Tue, 24 Mar 2026 23:42:43 +0530 [thread overview]
Message-ID: <20260324181244.17741-5-armenon@redhat.com> (raw)
In-Reply-To: <20260324181244.17741-1-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>
---
drivers/char/tpm/tpm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 87d68ddf270a7..26c3765fbd732 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -33,7 +33,7 @@
#endif
#define TPM_MINOR 224 /* officially assigned */
-#define TPM_BUFSIZE 4096
+#define TPM_BUFSIZE 8192
#define TPM_NUM_DEVICES 65536
#define TPM_RETRY 50
--
2.53.0
next prev parent reply other threads:[~2026-03-24 18:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-24 18:12 [RFC v2 0/5] tpm_crb: Add command and response buffer chunking support Arun Menon
2026-03-24 18:12 ` [RFC v2 1/5] tpm_crb: Add register definitions of TPM CRB chunking fields Arun Menon
2026-03-24 18:12 ` [RFC v2 2/5] tpm_crb: Add new wrapper function to invoke start method Arun Menon
2026-03-24 18:12 ` [RFC v2 3/5] tpm_crb: Implement command and response chunking logic Arun Menon
2026-03-24 18:12 ` Arun Menon [this message]
2026-03-24 18:12 ` [RFC v2 5/5] tpm: tis_i2c: Use local 4KB buffer to limit memory usage Arun Menon
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