From patchwork Fri Apr 5 16:52:25 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Petr Vorel X-Patchwork-Id: 10887643 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7C03F1515 for ; Fri, 5 Apr 2019 16:52:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 64AE9289EA for ; Fri, 5 Apr 2019 16:52:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 58B7E28A7E; Fri, 5 Apr 2019 16:52:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CE6A6289EA for ; Fri, 5 Apr 2019 16:52:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731183AbfDEQwk (ORCPT ); Fri, 5 Apr 2019 12:52:40 -0400 Received: from mx2.suse.de ([195.135.220.15]:52572 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730587AbfDEQwk (ORCPT ); Fri, 5 Apr 2019 12:52:40 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 69F56B143; Fri, 5 Apr 2019 16:52:38 +0000 (UTC) From: Petr Vorel To: ltp@lists.linux.it Cc: Petr Vorel , Mimi Zohar , Ignaz Forster , Fabian Vogt , Marcus Meissner , linux-integrity@vger.kernel.org Subject: [PATCH v2 3/3] ima: Add overlay test Date: Fri, 5 Apr 2019 18:52:25 +0200 Message-Id: <20190405165225.27216-4-pvorel@suse.cz> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190405165225.27216-1-pvorel@suse.cz> References: <20190405165225.27216-1-pvorel@suse.cz> MIME-Version: 1.0 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP test demonstrate a bug on overlayfs on current mainline kernel when combining IMA with EVM. Based on reproducer made by Ignaz Forster used for not upstreamed patchset [1] and previous report [2]. IMA only behavior has already been fixed [3]. NOTE: backup variables are needed because ima_setup.sh calling tst_mount as well when TMPDIR is on tmpfs device. [1] https://www.spinics.net/lists/linux-integrity/msg05926.html [2] https://www.spinics.net/lists/linux-integrity/msg03593.html [3] https://patchwork.kernel.org/patch/10776231/ Tested-by: Ignaz Forster Signed-off-by: Petr Vorel --- Changes v1->v2: * Added 2 more tests (suggested by Ignaz): append file and create a new file. Tests has been further split to 4 tests (previously was only 1). * Fixed testing on tmpfs (reported by Mimi) by adding TST_NEEDS_DEVICE=1. * Renamed file to evm_overlay.sh (from ima_overlay.sh; suggested by Ignaz). Obviously it's about IMA + EVM, but IMHO 'ima' can be left from filename. * Changed pattern for kernel parameters check (suggested by Mimi). TODO/questions: Still not sure what is a proper setup. Should I check EVM enabled? /sys/kernel/security/evm should be 1? I suppose different behaviour between ima_policy=appraise_tcb and ima_appraise_tcb is just my wrong setup. Thanks a lot for your comments. Kind regards, Petr --- runtest/ima | 1 + .../integrity/ima/tests/evm_overlay.sh | 86 +++++++++++++++++++ .../security/integrity/ima/tests/ima_setup.sh | 4 +- 3 files changed, 89 insertions(+), 2 deletions(-) create mode 100755 testcases/kernel/security/integrity/ima/tests/evm_overlay.sh diff --git a/runtest/ima b/runtest/ima index bcae16bb7..f3ea88cf0 100644 --- a/runtest/ima +++ b/runtest/ima @@ -3,3 +3,4 @@ ima_measurements ima_measurements.sh ima_policy ima_policy.sh ima_tpm ima_tpm.sh ima_violations ima_violations.sh +evm_overlay evm_overlay.sh diff --git a/testcases/kernel/security/integrity/ima/tests/evm_overlay.sh b/testcases/kernel/security/integrity/ima/tests/evm_overlay.sh new file mode 100755 index 000000000..08ec1ea37 --- /dev/null +++ b/testcases/kernel/security/integrity/ima/tests/evm_overlay.sh @@ -0,0 +1,86 @@ +#!/bin/sh +# Copyright (c) 2019 Petr Vorel +# Based on reproducer and further discussion with Ignaz Forster + +TST_SETUP="setup" +TST_CLEANUP="cleanup" +TST_NEEDS_DEVICE=1 +TST_CNT=4 +. ima_setup.sh + +setup() +{ + lower="$TST_MNTPOINT/lower" + upper="$TST_MNTPOINT/upper" + work="$TST_MNTPOINT/work" + merged="$TST_MNTPOINT/merged" + mkdir -p $lower $upper $work $merged + + device_backup="$TST_DEVICE" + TST_DEVICE="overlay" + + fs_type_backup="$TST_FS_TYPE" + TST_FS_TYPE="overlay" + + mntpoint_backup="$TST_MNTPOINT" + TST_MNTPOINT="$merged" + + params_backup="$TST_MNT_PARAMS" + TST_MNT_PARAMS="-o lowerdir=$lower,upperdir=$upper,workdir=$work" + + grep -q -e ima_policy= -e ima_appraise_tcb /proc/cmdline || \ + tst_brk TCONF "Test requires specify IMA policy as kernel parameter" + + tst_mount + mounted=1 +} + +test1() +{ + local file="foo1.txt" + + tst_res TINFO "overwrite file in overlay" + ROD echo lower \> $lower/$file + EXPECT_PASS echo overlay \> $merged/$file +} + +test2() +{ + local file="foo2.txt" + + tst_res TINFO "append file in overlay" + ROD echo lower \> $lower/$file + EXPECT_PASS echo overlay \>\> $merged/$file +} + +test3() +{ + local file="foo3.txt" + + tst_res TINFO "create a new file in overlay" + EXPECT_PASS echo overlay \> $merged/$file +} + +test4() +{ + local f + + tst_res TINFO "read all created files" + for f in $(find $TST_MNTPOINT -type f); do + EXPECT_PASS cat $f \> /dev/null 2\> /dev/null + done +} + +cleanup() +{ + [ -n "$mounted" ] || return 0 + + tst_umount $TST_DEVICE + + TST_DEVICE="$device_backup" + TST_FS_TYPE="$fs_type_backup" + TST_MNTPOINT="$mntpoint_backup" + TST_MNT_PARAMS="$params_backup" +} + +tst_run diff --git a/testcases/kernel/security/integrity/ima/tests/ima_setup.sh b/testcases/kernel/security/integrity/ima/tests/ima_setup.sh index da49eb1b2..08aa5300a 100644 --- a/testcases/kernel/security/integrity/ima/tests/ima_setup.sh +++ b/testcases/kernel/security/integrity/ima/tests/ima_setup.sh @@ -64,14 +64,14 @@ print_ima_config() local config="/boot/config-$(uname -r)" local i - tst_res TINFO "/proc/cmdline: $(cat /proc/cmdline)" - if [ -r "$config" ]; then tst_res TINFO "IMA kernel config:" for i in $(grep ^CONFIG_IMA $config); do tst_res TINFO "$i" done fi + + tst_res TINFO "/proc/cmdline: $(cat /proc/cmdline)" } ima_setup()