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Mon, 18 May 2026 08:17:50 -0700 (PDT) X-Received: by 2002:a05:6a00:a221:b0:82f:7b98:e499 with SMTP id d2e1a72fcca58-83f33d9dcb4mr15964624b3a.31.1779117470023; Mon, 18 May 2026 08:17:50 -0700 (PDT) Received: from fedora.armenon-thinkpadp16vgen1.bengluru.csb ([49.36.104.172]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-83f197815cesm18181153b3a.24.2026.05.18.08.17.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 May 2026 08:17:49 -0700 (PDT) From: Arun Menon To: linux-kernel@vger.kernel.org Cc: Jarkko Sakkinen , linux-integrity@vger.kernel.org, Jason Gunthorpe , Peter Huewe , Arun Menon Subject: [PATCH v3 5/6] tpm: Increase TPM_BUFSIZE to 8kB for chunking support Date: Mon, 18 May 2026 20:47:23 +0530 Message-ID: <20260518151724.730443-6-armenon@redhat.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260518151724.730443-1-armenon@redhat.com> References: <20260518151724.730443-1-armenon@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Arun Menon 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 --- include/linux/tpm.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 01216156a1ec..af2bfac45fe0 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -26,7 +26,7 @@ #include #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