linux-kernel - [PATCH v5 20/24] selftests/landlock: Extend tests for landlock_restrict

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Message-ID: <20250131163059.1139617-21-mic@digikod.net>
Date: Fri, 31 Jan 2025 17:30:55 +0100
From: Mickaël Salaün <mic@...ikod.net>
To: Eric Paris <eparis@...hat.com>,
	Paul Moore <paul@...l-moore.com>,
	Günther Noack <gnoack@...gle.com>,
	"Serge E . Hallyn" <serge@...lyn.com>
Cc: Mickaël Salaün <mic@...ikod.net>,
	Ben Scarlato <akhna@...gle.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Charles Zaffery <czaffery@...lox.com>,
	Daniel Burgener <dburgener@...ux.microsoft.com>,
	Francis Laniel <flaniel@...ux.microsoft.com>,
	James Morris <jmorris@...ei.org>,
	Jann Horn <jannh@...gle.com>,
	Jeff Xu <jeffxu@...gle.com>,
	Jorge Lucangeli Obes <jorgelo@...gle.com>,
	Kees Cook <kees@...nel.org>,
	Konstantin Meskhidze <konstantin.meskhidze@...wei.com>,
	Matt Bobrowski <mattbobrowski@...gle.com>,
	Mikhail Ivanov <ivanov.mikhail1@...wei-partners.com>,
	Phil Sutter <phil@....cc>,
	Praveen K Paladugu <prapal@...ux.microsoft.com>,
	Robert Salvet <robert.salvet@...lox.com>,
	Shervin Oloumi <enlightened@...gle.com>,
	Song Liu <song@...nel.org>,
	Tahera Fahimi <fahimitahera@...il.com>,
	Tyler Hicks <code@...icks.com>,
	audit@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: [PATCH v5 20/24] selftests/landlock: Extend tests for landlock_restrict_self()'s flags

Add the restrict_self_flags test suite to check that
LANDLOCK_RESTRICT_SELF_QUIET, LANDLOCK_RESTRICT_SELF_QUIET_SUBDOMAINS,
and LANDLOCK_RESTRICT_SELF_LOG_CROSS_EXEC are valid but not the next
bit.  Also test flags incompatibility.  Some checks are similar to
restrict_self_checks_ordering's ones.

Cc: Günther Noack <gnoack@...gle.com>
Cc: Paul Moore <paul@...l-moore.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20250131163059.1139617-21-mic@digikod.net
---

Changes since v4:
- Update with LANDLOCK_RESTRICT_SELF_QUIET_SUBDOMAINS, and
  LANDLOCK_RESTRICT_SELF_LOG_CROSS_EXEC.

Changes since v3:
- Use a last_flag variable.

Changes since v2:
- New patch.
---
 tools/testing/selftests/landlock/base_test.c | 41 ++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/tools/testing/selftests/landlock/base_test.c b/tools/testing/selftests/landlock/base_test.c
index fbd687691b3c..9e21f7535ab6 100644
--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -233,6 +233,47 @@ TEST(restrict_self_checks_ordering)
 	ASSERT_EQ(0, close(ruleset_fd));
 }
 
+TEST(restrict_self_flags)
+{
+	const __u32 last_flag = LANDLOCK_RESTRICT_SELF_LOG_CROSS_EXEC;
+
+	/* Tests valid flag combinations. */
+
+	ASSERT_EQ(-1, landlock_restrict_self(-1, 0));
+	ASSERT_EQ(EBADF, errno);
+
+	ASSERT_EQ(-1, landlock_restrict_self(-1, LANDLOCK_RESTRICT_SELF_QUIET));
+	ASSERT_EQ(EBADF, errno);
+
+	ASSERT_EQ(-1, landlock_restrict_self(
+			      -1, LANDLOCK_RESTRICT_SELF_QUIET_SUBDOMAINS));
+	ASSERT_EQ(EBADF, errno);
+
+	ASSERT_EQ(-1,
+		  landlock_restrict_self(
+			  -1, LANDLOCK_RESTRICT_SELF_QUIET |
+				      LANDLOCK_RESTRICT_SELF_QUIET_SUBDOMAINS));
+	ASSERT_EQ(EBADF, errno);
+
+	ASSERT_EQ(-1, landlock_restrict_self(
+			      -1, LANDLOCK_RESTRICT_SELF_LOG_CROSS_EXEC));
+	ASSERT_EQ(EBADF, errno);
+
+	/* Tests invalid flag combinations. */
+
+	ASSERT_EQ(-1,
+		  landlock_restrict_self(
+			  -1, LANDLOCK_RESTRICT_SELF_QUIET |
+				      LANDLOCK_RESTRICT_SELF_LOG_CROSS_EXEC));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(-1, landlock_restrict_self(-1, last_flag << 1));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(-1, landlock_restrict_self(-1, -1));
+	ASSERT_EQ(EINVAL, errno);
+}
+
 TEST(ruleset_fd_io)
 {
 	struct landlock_ruleset_attr ruleset_attr = {
-- 
2.48.1