selftests/landlock: Add tests for invalid use of quiet flag

Make sure that these calls return EINVAL.

Test coverage for security/landlock is 91.6% of 2347 lines according to
LLVM 22.

Assisted-by: GitHub-Copilot:claude-opus-4.8
Signed-off-by: Tingmao Wang <m@maowtm.org>
Link: https://patch.msgid.link/9401d5c6468675863d944d6c26640d97db1a1f31.1781228815.git.m@maowtm.org
[mic: Add test coverage]
Signed-off-by: Mickaël Salaün <mic@digikod.net>

1 files changed, 116 insertions, 0 deletions

diff --git a/tools/testing/selftests/landlock/base_test.c b/tools/testing/selftests/landlock/base_test.c
index 84e91fcaa1b2..cbd3c1669951 100644
--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -526,4 +526,120 @@ TEST(cred_transfer)
 	EXPECT_EQ(EACCES, errno);
 }
 
+TEST(useless_quiet_rule_fs)
+{
+	struct landlock_ruleset_attr ruleset_attr = {
+		.handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR,
+		.quiet_access_fs = 0,
+	};
+	struct landlock_path_beneath_attr path_beneath_attr = {
+		.allowed_access = LANDLOCK_ACCESS_FS_READ_DIR,
+	};
+	int ruleset_fd, root_fd;
+
+	drop_caps(_metadata);
+	ruleset_fd =
+		landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
+	ASSERT_LE(0, ruleset_fd);
+
+	root_fd = open("/", O_PATH | O_CLOEXEC);
+	ASSERT_LE(0, root_fd);
+	path_beneath_attr.parent_fd = root_fd;
+	ASSERT_EQ(-1, landlock_add_rule(ruleset_fd, LANDLOCK_RULE_PATH_BENEATH,
+					&path_beneath_attr,
+					LANDLOCK_ADD_RULE_QUIET));
+	ASSERT_EQ(EINVAL, errno);
+
+	/* Check that the rule had not been added. */
+	ASSERT_EQ(0, close(root_fd));
+	enforce_ruleset(_metadata, ruleset_fd);
+	ASSERT_EQ(0, close(ruleset_fd));
+
+	ASSERT_EQ(-1, open("/", O_RDONLY | O_DIRECTORY | O_CLOEXEC));
+	ASSERT_EQ(EACCES, errno);
+}
+
+TEST(useless_quiet_rule_net)
+{
+	struct landlock_ruleset_attr ruleset_attr = {
+		.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP,
+		.quiet_access_net = 0,
+	};
+	struct landlock_net_port_attr net_port_attr = {
+		.allowed_access = LANDLOCK_ACCESS_NET_BIND_TCP,
+		.port = 1024,
+	};
+	int ruleset_fd;
+
+	drop_caps(_metadata);
+	ruleset_fd =
+		landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
+	ASSERT_LE(0, ruleset_fd);
+
+	ASSERT_EQ(-1,
+		  landlock_add_rule(ruleset_fd, LANDLOCK_RULE_NET_PORT,
+				    &net_port_attr, LANDLOCK_ADD_RULE_QUIET));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(0, close(ruleset_fd));
+}
+
+TEST(invalid_quiet_bits_1)
+{
+	const struct landlock_ruleset_attr ruleset_attr_fs = {
+		.handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR,
+		.quiet_access_fs = LANDLOCK_ACCESS_FS_WRITE_FILE,
+	};
+	const struct landlock_ruleset_attr ruleset_attr_net = {
+		.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP,
+		.quiet_access_net = LANDLOCK_ACCESS_NET_CONNECT_TCP,
+	};
+	const struct landlock_ruleset_attr ruleset_attr_scoped = {
+		.scoped = LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET,
+		.quiet_scoped = LANDLOCK_SCOPE_SIGNAL,
+	};
+
+	/* Quiet bit set but not part of the handled mask. */
+	ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr_fs,
+					      sizeof(ruleset_attr_fs), 0));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr_net,
+					      sizeof(ruleset_attr_net), 0));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr_scoped,
+					      sizeof(ruleset_attr_scoped), 0));
+	ASSERT_EQ(EINVAL, errno);
+}
+
+TEST(invalid_quiet_bits_2)
+{
+	const struct landlock_ruleset_attr ruleset_attr_fs = {
+		.handled_access_fs = LANDLOCK_ACCESS_FS_READ_DIR,
+		.quiet_access_fs = 1ULL << 63,
+	};
+	const struct landlock_ruleset_attr ruleset_attr_net = {
+		.handled_access_net = LANDLOCK_ACCESS_NET_BIND_TCP,
+		.quiet_access_net = 1ULL << 63,
+	};
+	const struct landlock_ruleset_attr ruleset_attr_scoped = {
+		.scoped = LANDLOCK_SCOPE_ABSTRACT_UNIX_SOCKET,
+		.quiet_scoped = 1ULL << 63,
+	};
+
+	/* Quiet bit outside of the valid access range. */
+	ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr_fs,
+					      sizeof(ruleset_attr_fs), 0));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr_net,
+					      sizeof(ruleset_attr_net), 0));
+	ASSERT_EQ(EINVAL, errno);
+
+	ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr_scoped,
+					      sizeof(ruleset_attr_scoped), 0));
+	ASSERT_EQ(EINVAL, errno);
+}
+
 TEST_HARNESS_MAIN