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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 474D8C04EBA for ; Mon, 19 Nov 2018 19:56:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 186C82086A for ; Mon, 19 Nov 2018 19:56:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 186C82086A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-security-module-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730532AbeKTGVo (ORCPT ); Tue, 20 Nov 2018 01:21:44 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:45196 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730649AbeKTGVo (ORCPT ); Tue, 20 Nov 2018 01:21:44 -0500 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wAJJsTTo107652 for ; Mon, 19 Nov 2018 14:56:33 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0b-001b2d01.pphosted.com with ESMTP id 2nv0kygh5k-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 19 Nov 2018 14:56:32 -0500 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 19 Nov 2018 19:56:28 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wAJJuQZv61604090 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 19 Nov 2018 19:56:26 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 441F3A405C; Mon, 19 Nov 2018 19:56:26 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1C1CFA4060; Mon, 19 Nov 2018 19:56:25 +0000 (GMT) Received: from dhcp-9-31-102-82.watson.ibm.com (unknown [9.31.102.82]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 19 Nov 2018 19:56:24 +0000 (GMT) From: Mimi Zohar To: linux-integrity@vger.kernel.org Cc: Mimi Zohar , linux-security-module@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, dhowells@redhat.com, jforbes@redhat.com, seth.forshee@canonical.com, kexec@lists.infradead.org, Nayna Jain Subject: [PATCH 2/3] selftests/ima: kexec_load syscall test Date: Mon, 19 Nov 2018 14:56:10 -0500 X-Mailer: git-send-email 2.7.5 In-Reply-To: <1542657371-7019-1-git-send-email-zohar@linux.ibm.com> References: <1542657371-7019-1-git-send-email-zohar@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18111919-0020-0000-0000-000002EA70BB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18111919-0021-0000-0000-000021399F02 Message-Id: <1542657371-7019-3-git-send-email-zohar@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-19_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=6 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811190178 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: The kernel CONFIG_KEXEC_VERIFY_SIG option is limited to verifying a kernel image's signature, when loaded via the kexec_file_load syscall. There is no method for verifying a kernel image's signature loaded via the kexec_load syscall. This test verifies loading the kernel image via the kexec_load syscall fails when the kernel CONFIG_KEXEC_VERIFY_SIG option is enabled on systems with secureboot enabled[1]. [1] Detecting secureboot enabled is architecture specific. Signed-off-by: Mimi Zohar --- tools/testing/selftests/Makefile | 1 + tools/testing/selftests/ima/Makefile | 11 ++++++ tools/testing/selftests/ima/config | 4 ++ tools/testing/selftests/ima/test_kexec_load.sh | 54 ++++++++++++++++++++++++++ 4 files changed, 70 insertions(+) create mode 100644 tools/testing/selftests/ima/Makefile create mode 100644 tools/testing/selftests/ima/config create mode 100755 tools/testing/selftests/ima/test_kexec_load.sh diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index f1fe492c8e17..552c447af03d 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -13,6 +13,7 @@ TARGETS += firmware TARGETS += ftrace TARGETS += futex TARGETS += gpio +TARGETS += ima TARGETS += intel_pstate TARGETS += ipc TARGETS += kcmp diff --git a/tools/testing/selftests/ima/Makefile b/tools/testing/selftests/ima/Makefile new file mode 100644 index 000000000000..0b3adf5444b6 --- /dev/null +++ b/tools/testing/selftests/ima/Makefile @@ -0,0 +1,11 @@ +# Makefile for kexec_load + +uname_M := $(shell uname -m 2>/dev/null || echo not) +ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/) + +ifeq ($(ARCH),x86) +TEST_PROGS := test_kexec_load.sh + +include ../lib.mk + +endif diff --git a/tools/testing/selftests/ima/config b/tools/testing/selftests/ima/config new file mode 100644 index 000000000000..6bc86d4d9bb4 --- /dev/null +++ b/tools/testing/selftests/ima/config @@ -0,0 +1,4 @@ +CONFIG_IMA_APPRAISE +CONFIG_IMA_ARCH_POLICY +CONFIG_SECURITYFS +CONFIG_KEXEC_VERIFY_SIG diff --git a/tools/testing/selftests/ima/test_kexec_load.sh b/tools/testing/selftests/ima/test_kexec_load.sh new file mode 100755 index 000000000000..3aafc6f6a400 --- /dev/null +++ b/tools/testing/selftests/ima/test_kexec_load.sh @@ -0,0 +1,54 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Loading a kernel image via the kexec_load syscall should fail +# when the kerne is CONFIG_KEXEC_VERIFY_SIG enabled and the system +# is booted in secureboot mode. + +TEST="$0" +EFIVARFS="/sys/firmware/efi/efivars" +rc=0 + +# Kselftest framework requirement - SKIP code is 4. +ksft_skip=4 + +# kexec requires root privileges +if [ $UID != 0 ]; then + echo "$TEST: must be run as root" >&2 + exit $ksft_skip +fi + +# Make sure that efivars is mounted in the normal location +if ! grep -q "^\S\+ $EFIVARFS efivarfs" /proc/mounts; then + echo "$TEST: efivars is not mounted on $EFIVARFS" >&2 + exit $ksft_skip +fi + +# Get secureboot mode +file="$EFIVARFS/SecureBoot-*" +if [ ! -e $file ]; then + echo "$TEST: unknown secureboot mode" >&2 + exit $ksft_skip +fi +secureboot=`hexdump $file | awk '{print substr($4,length($4),1)}'` + +# kexec_load should fail in secure boot mode +KERNEL_IMAGE="/boot/vmlinuz-`uname -r`" +kexec -l $KERNEL_IMAGE &>> /dev/null +if [ $? == 0 ]; then + kexec -u + if [ "$secureboot" == "1" ]; then + echo "$TEST: kexec_load succeeded [FAIL]" + rc=1 + else + echo "$TEST: kexec_load succeeded [PASS]" + fi +else + if [ "$secureboot" == "1" ]; then + echo "$TEST: kexec_load failed [PASS]" + else + echo "$TEST: kexec_load failed [FAIL]" + rc=1 + fi +fi + +exit $rc -- 2.7.5