From nobody Thu Dec 18 22:02:40 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 DAE5D20C493 for ; Wed, 11 Dec 2024 03:22:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733887347; cv=none; b=M9jvgKUfpgTDZILgcAzpB74sLEvc5Tm/27eHrRni3Bv6A/ZOmNunJCOmzyyBY1gdpYH2tK6AV5VvVsENwLdVCrRwyfDX82UOD3cbcKug0VSAFclc0DO0pMEhxNVrK4jLr7T9m2t0dRQBlMUXwQN2str6A+zrktoicGu02rvvwjU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733887347; c=relaxed/simple; bh=DH4VDPy+9YI7ulTmM5YVyRvQT99eqA2nEqtOa8X683c=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=MefDZBBOLHFXBZc2C5HDqqioDmMgDZzZx3DeJ5sl2jvmBMuAIFDu6vY3Wc7WAR2Et6rXuuiEFMhcV+/rsamEaVxeeg3NUnWIlW6FbfpF3I+brAp4UBRNkkZiDCdhKSywDN4nCYypjxtmrWx4O2XT3y8EoVDCFQH4iZzRwMX0MUE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=KVeBY+lK; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="KVeBY+lK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1733887346; x=1765423346; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=DH4VDPy+9YI7ulTmM5YVyRvQT99eqA2nEqtOa8X683c=; b=KVeBY+lKyWGivv2EFWJ9u0nRTVJBMH637bkGHc4im0azPG6ix+ehhzdY bzavh96GYR+cKGvUVgSG9CQ17yVIvGw9HqtKx6oyylAtn1g7gQQTmLJp1 Txxq12WhIKVypvAgc/TLSJ6DJs488ZxUAHWEIRAxClG3baY3sfljUvaYL 2GsmDhVw+i1d9yA5IfdiPTivDdxFaHn/WQTQA9oTUSkghP7+NNU3eyaph XXScRn32QYpnlv/MPznm9jSv3zxoJaPgKfL0gVSpxZn9oWf1OkPa16Xbm Xy6Pix1TY9jEL7D7uAe4JjttRgzq4MbHvHphAuq7zS4SKpYy8DEjQLiM2 g==; X-CSE-ConnectionGUID: IjsyiijxT2CgRMt3cVsX1g== X-CSE-MsgGUID: ZNOjDsuyQGauq9m2JVOuZw== X-IronPort-AV: E=McAfee;i="6700,10204,11282"; a="51785416" X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="51785416" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2024 19:22:25 -0800 X-CSE-ConnectionGUID: aZPvx75GT/OaZonPCQA5Ig== X-CSE-MsgGUID: pyF+pwKOQyuHXua0PtSUEg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="118878402" Received: from ibarbour-mobl.amr.corp.intel.com (HELO bxing-mobl1.clients.intel.com) ([10.246.116.49]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Dec 2024 19:22:24 -0800 From: Cedric Xing Date: Tue, 10 Dec 2024 21:22:16 -0600 Subject: [PATCH RFC v3 2/2] tsm: Add TVM Measurement Sample Code Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241210-tsm-rtmr-v3-2-5997d4dbda73@intel.com> References: <20241210-tsm-rtmr-v3-0-5997d4dbda73@intel.com> In-Reply-To: <20241210-tsm-rtmr-v3-0-5997d4dbda73@intel.com> To: Dan Williams , Samuel Ortiz , James Bottomley , Lukas Wunner , Dionna Amalie Glaze , Qinkun Bao , Mikko Ylinen , Kuppuswamy Sathyanarayanan Cc: linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev X-Mailer: b4 0.13.0 This sample kernel module demonstrates how to make MRs accessible to user mode through TSM. Once loaded, this module registers a virtual measurement provider with the TSM core and will result in the directory tree below. /sys/kernel/tsm =E2=94=94=E2=94=80=E2=94=80 measurement-example =E2=94=9C=E2=94=80=E2=94=80 config_mr =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 sha512 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 digest =E2=94=9C=E2=94=80=E2=94=80 report_digest =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 sha512 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 digest =E2=94=9C=E2=94=80=E2=94=80 rtmr0 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 sha256 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 digest =E2=94=9C=E2=94=80=E2=94=80 rtmr1 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 sha384 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 digest =E2=94=9C=E2=94=80=E2=94=80 rtmr_crypto_agile =E2=94=82 =E2=94=9C=E2=94=80=E2=94=80 sha256 =E2=94=82 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 digest =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 sha384 =E2=94=82 =E2=94=94=E2=94=80=E2=94=80 digest =E2=94=94=E2=94=80=E2=94=80 static_mr =E2=94=94=E2=94=80=E2=94=80 sha384 =E2=94=94=E2=94=80=E2=94=80 digest Among the MRs in this example: - `static_mr` and `config_mr` are *Readonly* (static) MRs. - `rtmr0` is an RTMR with `TSM_MR_F_W` **cleared**, preventing direct extensions; as a result, `rtmr0/sha256/digest` is read-only. - `rtmr1` is an RTMR with `TSM_MR_F_W` **set**, permitting direct extensions; thus, `rtmr1/sha384/digest` is writable. - `rtmr_crypto_agile` demonstrates a "single" MR that supports multiple hash algorithms. Each supported algorithm has a corresponding digest, usually referred to as a "bank" in TCG terminology. In this specific sample, the 2 banks are aliased to `rtmr0` and `rtmr1`, respectively. - `report_digest` contains the digest of the internal report structure living in this sample module's memory. It is to demonstrate the use of the `TSM_MR_F_L` flag. Its value changes each time an RTMR is extended. More details can be found in `samples/tsm/measurement-example.c`. Signed-off-by: Cedric Xing --- MAINTAINERS | 1 + samples/Kconfig | 4 ++ samples/Makefile | 1 + samples/tsm/Makefile | 2 + samples/tsm/measurement-example.c | 113 ++++++++++++++++++++++++++++++++++= ++++ 5 files changed, 121 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index 4c833fa9e388..a4074cea0f16 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -23848,6 +23848,7 @@ S: Maintained F: Documentation/ABI/testing/configfs-tsm F: drivers/virt/coco/tsm*.c F: include/linux/tsm.h +F: samples/tsm/* =20 TRUSTED SERVICES TEE DRIVER M: Balint Dobszay diff --git a/samples/Kconfig b/samples/Kconfig index b288d9991d27..8159d3ca6487 100644 --- a/samples/Kconfig +++ b/samples/Kconfig @@ -184,6 +184,10 @@ config SAMPLE_TIMER bool "Timer sample" depends on CC_CAN_LINK && HEADERS_INSTALL =20 +config SAMPLE_TSM + tristate "TSM measurement sample" + depends on TSM_REPORTS + config SAMPLE_UHID bool "UHID sample" depends on CC_CAN_LINK && HEADERS_INSTALL diff --git a/samples/Makefile b/samples/Makefile index b85fa64390c5..891f5c12cd39 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -39,3 +39,4 @@ obj-$(CONFIG_SAMPLE_KMEMLEAK) +=3D kmemleak/ obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) +=3D coresight/ obj-$(CONFIG_SAMPLE_FPROBE) +=3D fprobe/ obj-$(CONFIG_SAMPLES_RUST) +=3D rust/ +obj-$(CONFIG_SAMPLE_TSM) +=3D tsm/ diff --git a/samples/tsm/Makefile b/samples/tsm/Makefile new file mode 100644 index 000000000000..3969a59221e9 --- /dev/null +++ b/samples/tsm/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SAMPLE_TSM) +=3D measurement-example.o diff --git a/samples/tsm/measurement-example.c b/samples/tsm/measurement-ex= ample.c new file mode 100644 index 000000000000..c5d6f44211dc --- /dev/null +++ b/samples/tsm/measurement-example.c @@ -0,0 +1,113 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright(c) 2024 Intel Corporation. All rights reserved. */ + +#define pr_fmt(x) KBUILD_MODNAME ": " x + +#include +#include +#include +#include + +struct { + u8 static_mr[SHA384_DIGEST_SIZE]; + u8 config_mr[SHA512_DIGEST_SIZE]; + u8 rtmr0[SHA256_DIGEST_SIZE]; + u8 rtmr1[SHA384_DIGEST_SIZE]; + u8 user_data[SHA512_DIGEST_SIZE]; + u8 report_digest[SHA512_DIGEST_SIZE]; +} example_report =3D { + .static_mr =3D "static_mr", + .config_mr =3D "config_mr", + .rtmr0 =3D "rtmr0", + .rtmr1 =3D "rtmr1", + .user_data =3D "user_data", +}; + +DEFINE_FREE(shash, struct crypto_shash *, if (!IS_ERR(_T)) crypto_free_sha= sh(_T)); + +static int example_report_refresh(struct tsm_measurement *tmr, + const struct tsm_measurement_register *mr) +{ + pr_debug("%s(%s,%s)\n", __func__, tmr->name, mr->mr_name); + struct crypto_shash *tfm __free(shash) =3D + crypto_alloc_shash(hash_algo_name[HASH_ALGO_SHA512], 0, 0); + if (IS_ERR(tfm)) + return PTR_ERR(tfm); + return crypto_shash_tfm_digest(tfm, (u8 *)&example_report, + offsetof(typeof(example_report), report_digest), + example_report.report_digest); +} + +static int example_report_extend_mr(struct tsm_measurement *tmr, + const struct tsm_measurement_register *mr, const u8 *data) +{ + SHASH_DESC_ON_STACK(desc, 0); + int rc; + + pr_debug("%s(%s,%s)\n", __func__, tmr->name, mr->mr_name); + + desc->tfm =3D crypto_alloc_shash(hash_algo_name[mr->mr_hash], 0, 0); + if (IS_ERR(desc->tfm)) + return PTR_ERR(desc->tfm); + + rc =3D crypto_shash_init(desc); + if (!rc) + rc =3D crypto_shash_update(desc, mr->mr_value, mr->mr_size); + if (!rc) + rc =3D crypto_shash_finup(desc, data, mr->mr_size, mr->mr_value); + + crypto_free_shash(desc->tfm); + return rc; +} + +#define MR_(mr, hash) .mr_value =3D &example_report.mr, TSM_MR_(mr, hash) +static const struct tsm_measurement_register example_mrs[] =3D { + /* static MR, read-only */ + { MR_(static_mr, SHA384) }, + /* config MR, read-only */ + { MR_(config_mr, SHA512) }, + /* RTMR, direct extension prohibited */ + { MR_(rtmr0, SHA256) | TSM_MR_F_RTMR }, + /* RTMR, direct extension allowed */ + { MR_(rtmr1, SHA384) | TSM_MR_F_RTMR | TSM_MR_F_W }, + /* RTMR, crypto agile, alaised to rtmr0 and rtmr1, respectively */ + { .mr_value =3D &example_report.rtmr0, + TSM_MR_(rtmr_crypto_agile, SHA256) | TSM_MR_F_RTMR | TSM_MR_F_W }, + { .mr_value =3D &example_report.rtmr1, + TSM_MR_(rtmr_crypto_agile, SHA384) | TSM_MR_F_RTMR | TSM_MR_F_W }, + /* most CC archs allow including user data in attestation */ + { MR_(report_digest, SHA512) | TSM_MR_F_L }, + /* terminating NULL entry */ + {} +}; +#undef MR_ + +static struct tsm_measurement example_measurement_provider =3D { + .name =3D "measurement-example", + .mrs =3D example_mrs, + .refresh =3D example_report_refresh, + .extend =3D example_report_extend_mr, +}; + +static int __init measurement_example_init(void) +{ + int rc; + + rc =3D tsm_register_measurement(&example_measurement_provider); + pr_debug("tsm_register_measurement(%p)=3D%d\n", &example_measurement_prov= ider, rc); + return rc; +} + +static void __exit measurement_example_exit(void) +{ + int rc; + + rc =3D tsm_unregister_measurement(&example_measurement_provider); + pr_debug("tsm_unregister_measurement(%p)=3D%d\n", &example_measurement_pr= ovider, rc); +} + +module_init(measurement_example_init); +module_exit(measurement_example_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Sample tsm_measurement implementation"); --=20 2.43.0