From mboxrd@z Thu Jan 1 00:00:00 1970 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=-11.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=no 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 519ACC47257 for ; Mon, 4 May 2020 20:38:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 330F42068E for ; Mon, 4 May 2020 20:38:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="K3BUKLXF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727086AbgEDUij (ORCPT ); Mon, 4 May 2020 16:38:39 -0400 Received: from linux.microsoft.com ([13.77.154.182]:34860 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726111AbgEDUij (ORCPT ); Mon, 4 May 2020 16:38:39 -0400 Received: from prsriva-linux.hsd1.wa.comcast.net (c-24-19-135-168.hsd1.wa.comcast.net [24.19.135.168]) by linux.microsoft.com (Postfix) with ESMTPSA id 6895820B717B; Mon, 4 May 2020 13:38:37 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 6895820B717B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1588624718; bh=6P2paN9NO0FWx6B7UbSmB/LcZk3eOjU9tLNhjVjgu2E=; h=From:To:Cc:Subject:Date:From; b=K3BUKLXFPzHk5/vc18E2X2yGYsVoVrEVR3Bjxnk0kkNoK1RyGJF07VpR4jNjPdswq PTdElXCTeIvlEoVsKZH0Tk/UjQ3124JQLUs2fMp9IFj0dQ3idwPz+efdmEETdAO+dm kf7mZQNd1GyWhA36D3uKZsPysbTHSk1ty11ir9Jk= From: Prakhar Srivastava To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, devicetree@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, robh+dt@kernel.org, frowand.list@gmail.com, zohar@linux.ibm.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, vincenzo.frascino@arm.com, mark.rutland@arm.com, masahiroy@kernel.org, james.morse@arm.com, bhsharma@redhat.com, mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com, christophe.leroy@c-s.fr, gregkh@linuxfoundation.org, nramas@linux.microsoft.com, prsriva@linux.microsoft.com, tusharsu@linux.microsoft.com, balajib@linux.microsoft.com Subject: [RFC][PATCH 0/2] Add support for using reserved memory for ima buffer pass Date: Mon, 4 May 2020 13:38:27 -0700 Message-Id: <20200504203829.6330-1-prsriva@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org IMA during kexec(kexec file load) verifies the kernel signature and measures the signature of the kernel. The signature in the logs can be used to verfiy the authenticity of the kernel. The logs don not get carried over kexec and thus remote attesation cannot verify the signature of the running kernel. Introduce an ABI to carry forward the ima logs over kexec. Memory reserved via device tree reservation can be used to store and read via the of_* functions. Reserved memory stores the size(sizeof(size_t)) of the buffer in the starting address, followed by the IMA log contents. Tested on: arm64 with Uboot Prakhar Srivastava (2): 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. arch/arm64/Kconfig | 1 + arch/arm64/include/asm/ima.h | 22 ++++ arch/arm64/include/asm/kexec.h | 5 + arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/ima_kexec.c | 64 ++++++++++ arch/arm64/kernel/machine_kexec_file.c | 1 + arch/powerpc/include/asm/ima.h | 3 +- arch/powerpc/kexec/ima.c | 14 ++- drivers/of/Kconfig | 6 + drivers/of/Makefile | 1 + drivers/of/of_ima.c | 165 +++++++++++++++++++++++++ include/linux/of.h | 34 +++++ security/integrity/ima/ima_kexec.c | 15 ++- 13 files changed, 325 insertions(+), 7 deletions(-) create mode 100644 arch/arm64/include/asm/ima.h create mode 100644 arch/arm64/kernel/ima_kexec.c create mode 100644 drivers/of/of_ima.c -- 2.25.1