From patchwork Wed Aug 19 17:21:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: nramas X-Patchwork-Id: 253607 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4FECEC433E3 for ; Wed, 19 Aug 2020 17:21:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F0BB20888 for ; Wed, 19 Aug 2020 17:21:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="YLP9CsoM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726482AbgHSRVm (ORCPT ); Wed, 19 Aug 2020 13:21:42 -0400 Received: from linux.microsoft.com ([13.77.154.182]:44272 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725939AbgHSRVl (ORCPT ); Wed, 19 Aug 2020 13:21:41 -0400 Received: from localhost.localdomain (c-73-42-176-67.hsd1.wa.comcast.net [73.42.176.67]) by linux.microsoft.com (Postfix) with ESMTPSA id 078BA20B4908; Wed, 19 Aug 2020 10:21:39 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 078BA20B4908 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1597857699; bh=UpCfcaHQrahaE2T3GHBLtMjY0drv+g0vhF7DKb3WEmo=; h=From:To:Cc:Subject:Date:From; b=YLP9CsoM9+5i4nPMXgM3TcscEWd4is442Fgao4Fs+4kG9BhBi5x8a4k4rDP/u0ObV 4DVtI3R8Lo+DGxV9xvdnTYzDf18hiqq0tY5jFiu0HWKeYMzzSQUZ0LOnckdcSq2Uo6 jmC2VNXMLvOTfqYu7iTck1JiGCglBJ1KAgoTOZm0= From: Lakshmi Ramasubramanian To: zohar@linux.ibm.com, bauerman@linux.ibm.com, robh@kernel.org, gregkh@linuxfoundation.org, james.morse@arm.com, catalin.marinas@arm.com, sashal@kernel.org, will@kernel.org, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, robh+dt@kernel.org, frowand.list@gmail.com, vincenzo.frascino@arm.com, mark.rutland@arm.com, dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com, pasha.tatashin@soleen.com, allison@lohutok.net, kstewart@linuxfoundation.org, takahiro.akashi@linaro.org, tglx@linutronix.de, masahiroy@kernel.org, bhsharma@redhat.com, mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com, christophe.leroy@c-s.fr Cc: linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, prsriva@linux.microsoft.com, balajib@linux.microsoft.com Subject: [PATCH v4 0/5] Carry forward IMA measurement log on kexec on ARM64 Date: Wed, 19 Aug 2020 10:21:29 -0700 Message-Id: <20200819172134.11243-1-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On kexec file load Integrgity Measurement Architecture(IMA) subsystem may verify the IMA signature of the kernel and initramfs, and measure it. The command line parameters passed to the kernel in the kexec call may also be measured by IMA. A remote attestation service can verify the measurement through the IMA log and the TPM PCR data. This can be achieved only if the IMA measurement log is carried over from the current kernel to the next kernel across the kexec call. However in the current implementation the IMA measurement logs are not carried over on ARM64 platforms. Therefore a remote attestation service cannot verify the authenticity of the running kernel on ARM64 platforms when the kernel is updated through the kexec system call. This patch series adds support for carrying forward the IMA measurement log on kexec on ARM64. powerpc already supports carrying forward the IMA measurement log on kexec. This series refactors the platform independent code such that it can be reused for ARM64 as well. A chosen node namely "linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold the address and the size of the memory reserved to carry the IMA measurement log. This patch series has been tested for ARM64 platform using QEMU. I would like help from the community for testing this change on powerpc. Thanks. This series is based on commit 18445bf405cb ("Merge tag 'spi-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi") in https://github.com/torvalds/linux "master" branch. Changelog: v4: - Submitting the patch series on behalf of the original author Prakhar Srivastava - Moved FDT_PROP_IMA_KEXEC_BUFFER ("linux,ima-kexec-buffer") to libfdt.h so that it can be shared by multiple platforms. v3: Breakup patches further into separate patches. - Refactoring non architecture specific code out of powerpc - Update powerpc related code to use fdt functions - Update IMA buffer read related code to use of functions - Add support to store the memory information of the IMA measurement logs to be carried forward. - Update the property strings to align with documented nodes https://github.com/devicetree-org/dt-schema/pull/46 v2: Break patches into separate patches. - Powerpc related Refactoring - Updating the docuemntation for chosen node - Updating arm64 to support IMA buffer pass v1: Refactoring carrying over IMA measuremnet logs over Kexec. This patch moves the non-architecture specific code out of powerpc and adds to security/ima.(Suggested by Thiago) Add Documentation regarding the ima-kexec-buffer node in the chosen node documentation v0: Add a layer of abstraction to use the memory reserved by device tree for ima buffer pass. Add support for ima buffer pass using reserved memory for arm64 kexec. Update the arch sepcific code path in kexec file load to store the ima buffer in the reserved memory. The same reserved memory is read on kexec or cold boot. Lakshmi Ramasubramanian (5): powerpc: Refactor kexec functions to move arch independent code to IMA powerpc: Use libfdt functions to fetch IMA buffer properties IMA: Refactor do_get_kexec_buffer() to call of_ functions directly arm64: Store IMA log information in kimage used for kexec arm64: Add IMA kexec buffer to DTB arch/arm64/Kconfig | 1 + arch/arm64/include/asm/ima.h | 17 ++++ arch/arm64/include/asm/kexec.h | 3 + arch/arm64/kernel/machine_kexec_file.c | 28 ++++++ arch/powerpc/include/asm/ima.h | 3 - arch/powerpc/kexec/ima.c | 123 ++++++------------------- include/linux/libfdt.h | 3 + security/integrity/ima/ima_kexec.c | 81 ++++++++++++++++ 8 files changed, 161 insertions(+), 98 deletions(-) create mode 100644 arch/arm64/include/asm/ima.h