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=-11.3 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 26C28C4724C for ; Fri, 1 May 2020 18:16:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 05BAA208DB for ; Fri, 1 May 2020 18:16:06 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="I6WH2P/p" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730372AbgEASQF (ORCPT ); Fri, 1 May 2020 14:16:05 -0400 Received: from linux.microsoft.com ([13.77.154.182]:44936 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729323AbgEASQF (ORCPT ); Fri, 1 May 2020 14:16:05 -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 69B0E20B717B; Fri, 1 May 2020 11:16:04 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 69B0E20B717B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1588356964; bh=6P2paN9NO0FWx6B7UbSmB/LcZk3eOjU9tLNhjVjgu2E=; h=From:To:Cc:Subject:Date:From; b=I6WH2P/pdHyLi0Ms0NIftrxrXe+LggJ7hhRdRSjWQPWtUqGQ8sApqO1Yf7/gxwjfg jBqK2KkRxnCcN27BqziSFWkTve5Jm5Q/+7D6JhxzDCv21tke7HbHnUVOrygX8vNyQI /1gcdaR3+NpGBfJMe+P1m0qXBpt+Z+roB+ziaAsk= From: Prakhar Srivastava To: linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Cc: 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: Fri, 1 May 2020 11:15:50 -0700 Message-Id: <20200501181552.1184827-1-prsriva@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@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