From nobody Fri Apr 3 12:47:27 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6213A3890F9 for ; Tue, 24 Mar 2026 18:13:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774375985; cv=none; b=dtA0m8Kq47W9o1H2emnuKdecuTyl77/KG/r4x62HfpEimx1KLPEdFWeSGacJe/kJpvKbju1S4poIIxMVuWfmzZcRx+JHoKZIpNr6++SSJVt2xF3Rv4dzbN1Q4ndPPka5WEJDeuojK34x4ybiJ8F3YEz8UAKkKr+NODJYG28jLMA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774375985; c=relaxed/simple; bh=hPL25OKm9bNXmRnz6cKeOMLxQeuKkk2o8t12Orj5iNI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IrjPNO1i7lDijr2ZO4Zt3nQdmMp++qy0PRqCGpfdcdaMi6S4/Ya/NF1yIgmy17iUAy813znSuoGmkP3jLthv6EdHfHUbhCo5eyalZI+EyuLgi0jz5qjw2CWrHdBO3E3ayF1C0PQle3imb6HH9hAOle4d++CgKf/7GS3wFBHgkuA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Dtd/q1S+; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=GXyWSQja; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Dtd/q1S+"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="GXyWSQja" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774375983; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=imwEJb99lBD32TauVrG1INXQ5z6pQWDRIPso/BjwfkI=; b=Dtd/q1S+Innh0wZISIiAfVVUtCgI7NAxl7KA9z/QSYvmxYuyhX0Atr2AqLUtFNa4M4wJkt o0ytixgMiGIgZmwQY2qlebdy3+CFixxNO2sVqBbzCkCccvhuwVK7xmjiPkN4ap0Pc9MseT 2qNDPlBWrqJTxmm/UiihzYrkTPZkACY= Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-671-Or7_7xEJPcOFOG_rtXbDow-1; Tue, 24 Mar 2026 14:13:01 -0400 X-MC-Unique: Or7_7xEJPcOFOG_rtXbDow-1 X-Mimecast-MFC-AGG-ID: Or7_7xEJPcOFOG_rtXbDow_1774375980 Received: by mail-pf1-f198.google.com with SMTP id d2e1a72fcca58-82c245a88a5so105857b3a.1 for ; Tue, 24 Mar 2026 11:13:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1774375980; x=1774980780; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=imwEJb99lBD32TauVrG1INXQ5z6pQWDRIPso/BjwfkI=; b=GXyWSQjaOiKIPiBmOP7/hSxhZIiu1GvuCa+CMvvbN0xOySN3uKhFqSdUK+Ft4sSeN6 0AaoD30aseDgPzeqQ2F9NCZTh88EOp247Sqd4JjOZ5dFRqmLIhTljnmfVqiAIor91jgS W+FAjg0hl3Mmda0x30JM+TEOL+yqbDd6ZnWR2LZsx3RVwb2yeEgxYL1pAb5j0qL1oFaT GNYq+MFEmvF3CX632SzgLK+0js6z1O8UzTsNTyxqbaeOoBmBrCcTToMIcKae4L4pJMPP hMik7QwigcdkeiJnvYu4j2u9MOVoJx14tpPxqNA7KcKJ1dCl6pI6bRfPG3qIbfAlU9Kl RP7A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774375980; x=1774980780; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=imwEJb99lBD32TauVrG1INXQ5z6pQWDRIPso/BjwfkI=; b=LwDv8HmZjwMPynVCDb3kbMMZr6dHIvgYkTdYCLmcijwgvc+2A7+WEFws7ChOFNjmh9 LBPJFodfLuLYpvE/fzm6K8pn7G9IZXarh+xf7q/idyZbq5Gvil+HFSlsz0qWyU5RweFy ETx9+YovhREVwwXakmpIKFENXqG29p43cne8TFj8Xvuho7QvoLK+nYZ8uogEK5zu4EhD wescHXvExqoxEqkGgbRTnsz+O6pLg57EEVJbjko7nfL4I/h+/egOmN2IrwzD/gVHm52z pewcuASoY5zZaQAZPgm2MPveLu/tfZAe1FOKIqw5RhXDuV0GMUC99cVVWBBPVQl1Ae1s otKQ== X-Gm-Message-State: AOJu0Yzn22jC/hdqvKw4kOhzwtSuwPXvOIqPiYE65rouM7g+cBGIl7lU nYEMFZ6z8mEhGelQK73gp1icnonapgZOl00regOxeMf67UkY4UcIyuNFN0k2YencLZ7/xXWBc+J QEwMw0gZHnsJB+1t3A8MTaNBbRd2X3STNoL3ghX7gipq6aYsfhjjDTpR6ikoYAC5Td1vcwpuLk6 Fx7b2379+NO9HdCX905n/pVgYjvw4c++cV8BKj45cSMSwNMheV X-Gm-Gg: ATEYQzz8SiE6G9h4MfiYn6xhqTRjr3l0ZH2W8Km7Y6+ahSCvqHzwkrZh1cboK3l33Zj k/4IKNlR+UAwO0yGBmuLCwogKhuT3CcMmEx/Jeruq/TFLb0Nm11V1GHd/gTIML2CnsPdjYFkCPj AXZ4HtwH+04HrY2sF+fOJXJRtELnkahSt9H65qlAWF+pDDxVIv+sUPFmSMU9RKrHZ5a4HzPs2K2 1Gbse1vhKETMAorc9bXq43VLcJi7bco7jGDb1SdhmvkdFceU8RGrhtqbSnAd5iTC6k6g+o3xTQO PjDPeosrTBwJTAo+89356Uf1AECpMn6d4cMK0IYWe4xNkhhihodZYX3xYvCCbLyiJWqjuV2lJAF +2M0x1Dg1dG1fae3fcuY+5z/TeOQNUwGDva/PYsCOxoRX9tmKTPCv90v9O3rogg== X-Received: by 2002:a05:6a00:3497:b0:81f:c6d1:5608 with SMTP id d2e1a72fcca58-82c6d846a06mr610593b3a.1.1774375980273; Tue, 24 Mar 2026 11:13:00 -0700 (PDT) X-Received: by 2002:a05:6a00:3497:b0:81f:c6d1:5608 with SMTP id d2e1a72fcca58-82c6d846a06mr610560b3a.1.1774375979655; 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-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 =20 #define TPM_MINOR 224 /* officially assigned */ -#define TPM_BUFSIZE 4096 +#define TPM_BUFSIZE 8192 #define TPM_NUM_DEVICES 65536 #define TPM_RETRY 50 =20 --=20 2.53.0