From patchwork Mon Apr 15 15:56:36 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sasha Levin X-Patchwork-Id: 10901085 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A492F1390 for ; Mon, 15 Apr 2019 15:57:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8ECE5284C8 for ; Mon, 15 Apr 2019 15:57:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 82B2D284E4; Mon, 15 Apr 2019 15:57:05 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 295A628571 for ; Mon, 15 Apr 2019 15:57:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727784AbfDOP44 (ORCPT ); Mon, 15 Apr 2019 11:56:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:37380 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727771AbfDOP4z (ORCPT ); Mon, 15 Apr 2019 11:56:55 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0BCCD2183F; Mon, 15 Apr 2019 15:56:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555343815; bh=bR2KjivPoLlY6Pq+egUxPlsqFOzLQeX1Mn0byEC8zko=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x9JR7qYkKg4dWd9FhRHhVdijDBjH5v5880HCRGnNWso/i8VQeOwt9LVxZL9M7UH1M bMYxwuhcfLNoyGS/T4+xZpeuTmbdQqrFDDnLODA6S1QLu0jpwYI2mCmilGKymBXDoc Bdvgdf+JZ6cpJ0CkKFDssF86wFiPqMN6pn/ZExU8= From: Sasha Levin To: peterhuewe@gmx.de, jarkko.sakkinen@linux.intel.com, jgg@ziepe.ca Cc: corbet@lwn.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@microsoft.com, thiruan@microsoft.com, bryankel@microsoft.com, Sasha Levin Subject: [PATCH v3 2/2] ftpm: add documentation for ftpm driver Date: Mon, 15 Apr 2019 11:56:36 -0400 Message-Id: <20190415155636.32748-3-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190415155636.32748-1-sashal@kernel.org> References: <20190415155636.32748-1-sashal@kernel.org> MIME-Version: 1.0 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds basic documentation to describe the new fTPM driver. Signed-off-by: Sasha Levin Signed-off-by: Sasha Levin (Microsoft) --- Documentation/security/tpm/index.rst | 1 + Documentation/security/tpm/tpm_ftpm_tee.rst | 31 +++++++++++++++++++++ 2 files changed, 32 insertions(+) create mode 100644 Documentation/security/tpm/tpm_ftpm_tee.rst diff --git a/Documentation/security/tpm/index.rst b/Documentation/security/tpm/index.rst index af77a7bbb070..15783668644f 100644 --- a/Documentation/security/tpm/index.rst +++ b/Documentation/security/tpm/index.rst @@ -4,4 +4,5 @@ Trusted Platform Module documentation .. toctree:: + tpm_ftpm_tee tpm_vtpm_proxy diff --git a/Documentation/security/tpm/tpm_ftpm_tee.rst b/Documentation/security/tpm/tpm_ftpm_tee.rst new file mode 100644 index 000000000000..29c2f8b5ed10 --- /dev/null +++ b/Documentation/security/tpm/tpm_ftpm_tee.rst @@ -0,0 +1,31 @@ +============================================= +Firmware TPM Driver +============================================= + +| Authors: +| Thirupathaiah Annapureddy +| Sasha Levin + +This document describes the firmware Trusted Platform Module (fTPM) +device driver. + +Introduction +============ + +This driver is a shim for a firmware implemented in ARM's TrustZone +environment. The driver allows programs to interact with the TPM in the same +way the would interact with a hardware TPM. + +Design +====== + +The driver acts as a thin layer that passes commands to and from a TPM +implemented in firmware. The driver itself doesn't contain much logic and is +used more like a dumb pipe between firmware and kernel/userspace. + +The firmware itself is based on the following paper: +https://www.microsoft.com/en-us/research/wp-content/uploads/2017/06/ftpm1.pdf + +When the driver is loaded it will expose ``/dev/tpmX`` character devices to +userspace which will enable userspace to communicate with the firmware tpm +through this device.