From patchwork Fri Nov 22 14:33:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= X-Patchwork-Id: 13883222 Received: from smtp-42a8.mail.infomaniak.ch (smtp-42a8.mail.infomaniak.ch [84.16.66.168]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0922C1DEFC7 for ; Fri, 22 Nov 2024 14:34:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=84.16.66.168 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732286065; cv=none; b=p/wC7pGa/DJlxI4/kOYf7ajfcgftStTT/1/jBEPVO0DRDI8SrcOohmyeHRXRAAwsAXHEn0S6XkO34HnjApsL67BochpF0v/BzmhO5qxX94+ntn3f8LHPzWnDMSSwuONLy966EVVygpBZC94bKHIIl8+BxbAhXWDvIiVd5g+4G4Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732286065; c=relaxed/simple; bh=5jhXIrCKW9G90gP+X+JAGYcArPkac3fHOXKVNwSJI20=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Bt2cIfgv/TsEFRCnmUFYckIJyOpF/EAsrxjD8YebEY556/OPHmWVwf8gNFaGKBUJH/W1XD1xpFNcB56ZrI2CCjnqhXk7A0UijMRgSCmsQXXfwwRtYHVxyGR55rRqfT3EYD19j+0S7FgyevF11RZFoFMknnbHspZUqqsQlq0ctiY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net; spf=pass smtp.mailfrom=digikod.net; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b=rZvMXWQJ; arc=none smtp.client-ip=84.16.66.168 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=digikod.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=digikod.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=digikod.net header.i=@digikod.net header.b="rZvMXWQJ" Received: from smtp-3-0000.mail.infomaniak.ch (smtp-3-0000.mail.infomaniak.ch [10.4.36.107]) by smtp-3-3000.mail.infomaniak.ch (Postfix) with ESMTPS id 4XvyKS3jrhzZsx; Fri, 22 Nov 2024 15:34:20 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=digikod.net; s=20191114; t=1732286060; bh=+NTh0aRLS4WQhSiSk2pWdvUKQlq2NLeswsQdqGHb16Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rZvMXWQJJE1Hrk7rMLICf+JRABO9hjsv/AjjE2WomOaE+zZHQum7xuOmVVu3TnXPl p+y53yHGANGNRdMicklvaUH9p+9pv97o/pzhG7TXE7WHKDB5grJquGJlhxjv2TR8Xn wemY3kzzewoCcAy0ZPSsEA2iKEbuX0RHlDbaPey8= Received: from unknown by smtp-3-0000.mail.infomaniak.ch (Postfix) with ESMTPA id 4XvyKR5CDzzkXR; Fri, 22 Nov 2024 15:34:19 +0100 (CET) From: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= To: Eric Paris , Paul Moore , =?utf-8?q?G=C3=BCnther_Noack?= , "Serge E . Hallyn" Cc: =?utf-8?q?Micka=C3=ABl_Sala=C3=BCn?= , Ben Scarlato , Casey Schaufler , Charles Zaffery , Francis Laniel , James Morris , Jann Horn , Jeff Xu , Jorge Lucangeli Obes , Kees Cook , Konstantin Meskhidze , Matt Bobrowski , Mikhail Ivanov , Phil Sutter , Praveen K Paladugu , Robert Salvet , Shervin Oloumi , Song Liu , Tahera Fahimi , audit@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v3 13/23] selftests/landlock: Add test to check partial access in a mount tree Date: Fri, 22 Nov 2024 15:33:43 +0100 Message-ID: <20241122143353.59367-14-mic@digikod.net> In-Reply-To: <20241122143353.59367-1-mic@digikod.net> References: <20241122143353.59367-1-mic@digikod.net> Precedence: bulk X-Mailing-List: audit@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Infomaniak-Routing: alpha Add layout1.refer_part_mount_tree_is_allowed to test the masked logical issue regarding collect_domain_accesses() calls followed by the is_access_to_paths_allowed() check in current_check_refer_path(). See previous commit. This test should work without the previous fix as well, but it enables us to make sure future changes will not have impact regarding this behavior. Cc: Günther Noack Signed-off-by: Mickaël Salaün Link: https://lore.kernel.org/r/20241122143353.59367-14-mic@digikod.net --- Changes since v2: - New patch. --- tools/testing/selftests/landlock/fs_test.c | 54 ++++++++++++++++++++-- 1 file changed, 50 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c index 6788762188fe..42ce1e79ba82 100644 --- a/tools/testing/selftests/landlock/fs_test.c +++ b/tools/testing/selftests/landlock/fs_test.c @@ -85,6 +85,9 @@ static const char file1_s3d1[] = TMP_DIR "/s3d1/f1"; /* dir_s3d2 is a mount point. */ static const char dir_s3d2[] = TMP_DIR "/s3d1/s3d2"; static const char dir_s3d3[] = TMP_DIR "/s3d1/s3d2/s3d3"; +static const char file1_s3d3[] = TMP_DIR "/s3d1/s3d2/s3d3/f1"; +static const char dir_s3d4[] = TMP_DIR "/s3d1/s3d2/s3d4"; +static const char file1_s3d4[] = TMP_DIR "/s3d1/s3d2/s3d4/f1"; /* * layout1 hierarchy: @@ -108,8 +111,11 @@ static const char dir_s3d3[] = TMP_DIR "/s3d1/s3d2/s3d3"; * │   └── f2 * └── s3d1 *    ├── f1 - * └── s3d2 - * └── s3d3 + * └── s3d2 [mount point] + *    ├── s3d3 + *    │ └── f1 + *    └── s3d4 + *    └── f1 */ static bool fgrep(FILE *const inf, const char *const str) @@ -358,7 +364,8 @@ static void create_layout1(struct __test_metadata *const _metadata) ASSERT_EQ(0, mount_opt(&mnt_tmp, dir_s3d2)); clear_cap(_metadata, CAP_SYS_ADMIN); - ASSERT_EQ(0, mkdir(dir_s3d3, 0700)); + create_file(_metadata, file1_s3d3); + create_file(_metadata, file1_s3d4); } static void remove_layout1(struct __test_metadata *const _metadata) @@ -378,7 +385,8 @@ static void remove_layout1(struct __test_metadata *const _metadata) EXPECT_EQ(0, remove_path(dir_s2d2)); EXPECT_EQ(0, remove_path(file1_s3d1)); - EXPECT_EQ(0, remove_path(dir_s3d3)); + EXPECT_EQ(0, remove_path(file1_s3d3)); + EXPECT_EQ(0, remove_path(file1_s3d4)); set_cap(_metadata, CAP_SYS_ADMIN); umount(dir_s3d2); clear_cap(_metadata, CAP_SYS_ADMIN); @@ -2444,6 +2452,44 @@ TEST_F_FORK(layout1, refer_mount_root_deny) EXPECT_EQ(0, close(root_fd)); } +TEST_F_FORK(layout1, refer_part_mount_tree_is_allowed) +{ + const struct rule layer1[] = { + { + /* Parent mount point. */ + .path = dir_s3d1, + .access = LANDLOCK_ACCESS_FS_REFER | + LANDLOCK_ACCESS_FS_MAKE_REG, + }, + { + /* + * Removing the source file is allowed because its + * access rights are already a superset of the + * destination. + */ + .path = dir_s3d4, + .access = LANDLOCK_ACCESS_FS_REFER | + LANDLOCK_ACCESS_FS_MAKE_REG | + LANDLOCK_ACCESS_FS_REMOVE_FILE, + }, + {}, + }; + int ruleset_fd; + + ASSERT_EQ(0, unlink(file1_s3d3)); + ruleset_fd = create_ruleset(_metadata, + LANDLOCK_ACCESS_FS_REFER | + LANDLOCK_ACCESS_FS_MAKE_REG | + LANDLOCK_ACCESS_FS_REMOVE_FILE, + layer1); + + ASSERT_LE(0, ruleset_fd); + enforce_ruleset(_metadata, ruleset_fd); + ASSERT_EQ(0, close(ruleset_fd)); + + ASSERT_EQ(0, rename(file1_s3d4, file1_s3d3)); +} + TEST_F_FORK(layout1, reparent_link) { const struct rule layer1[] = {