From patchwork Sun Jun 7 23:33:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prakhar Srivastava X-Patchwork-Id: 11592373 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 87902618 for ; Sun, 7 Jun 2020 23:33:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 67E9C2076A for ; Sun, 7 Jun 2020 23:33:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="jf58nVlw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727877AbgFGXde (ORCPT ); Sun, 7 Jun 2020 19:33:34 -0400 Received: from linux.microsoft.com ([13.77.154.182]:34008 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727786AbgFGXdd (ORCPT ); Sun, 7 Jun 2020 19:33:33 -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 C1D9520B717B; Sun, 7 Jun 2020 16:33:31 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C1D9520B717B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1591572812; bh=DB6Cl6RHr8cekVcsDZkbuYBtSszswuXLUSqvQUhO2ps=; h=From:To:Cc:Subject:Date:From; b=jf58nVlwSpSms4FyBpvdpS5L/b68k74OADgHL6/JRsKRN65DEQGu08m5Y9vgZjXz7 UMgDudDCE1Jx4rfifAEkUog31G9m/W1iUpE4SjPKR7or5h81nOg9rOO66POwl4ho6b Q+6FdMlHCNX3RzSGQ7tuKYlzVzkT1RmxfjrADR0Y= 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: [v1 PATCH 0/2] Adding support to carry IMA measurement logs Date: Sun, 7 Jun 2020 16:33:21 -0700 Message-Id: <20200607233323.22375-1-prsriva@linux.microsoft.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 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. Add a new chosen node entry linux,ima-kexec-buffer to hold the address and the size of the memory reserved to carry the IMA measurement log. Tested on: arm64 with Uboot Changelog: 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. Documentation/devicetree/bindings/chosen.txt | 17 +++ arch/arm64/Kconfig | 1 + arch/arm64/include/asm/ima.h | 24 +++ arch/arm64/include/asm/kexec.h | 3 + arch/arm64/kernel/machine_kexec_file.c | 47 +++++- arch/powerpc/include/asm/ima.h | 9 -- arch/powerpc/kexec/ima.c | 117 +------------- security/integrity/ima/ima_kexec.c | 151 +++++++++++++++++++ 8 files changed, 236 insertions(+), 133 deletions(-) create mode 100644 arch/arm64/include/asm/ima.h