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Tue, 24 Mar 2026 11:12:59 -0700 (PDT) Received: from fedora.armenon-thinkpadp16vgen1.bengluru.csb ([49.36.108.16]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82b0410b1bdsm16654229b3a.57.2026.03.24.11.12.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 11:12:59 -0700 (PDT) From: Arun Menon To: linux-kernel@vger.kernel.org Cc: Jarkko Sakkinen , linux-integrity@vger.kernel.org, Peter Huewe , Jason Gunthorpe , Arun Menon Subject: [RFC v2 4/5] tpm: Increase TPM_BUFSIZE to 8kB for chunking support Date: Tue, 24 Mar 2026 23:42:43 +0530 Message-ID: <20260324181244.17741-5-armenon@redhat.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260324181244.17741-1-armenon@redhat.com> References: <20260324181244.17741-1-armenon@redhat.com> Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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