selftests/landlock: Test landlock_create_ruleset(2) argument check ordering

Add inval_create_ruleset_arguments, extension of
inval_create_ruleset_flags, to also check error ordering for
landlock_create_ruleset(2).

This is similar to the previous commit checking landlock_add_rule(2).

Test coverage for security/landlock is 94.4% of 504 lines accorging to
gcc/gcov-11.

Link: https://lore.kernel.org/r/20220506160820.524344-11-mic@digikod.net
Cc: stable@vger.kernel.org
Signed-off-by: Mickaël Salaün <mic@digikod.net>

diff --git a/tools/testing/selftests/landlock/base_test.c b/tools/testing/selftests/landlock/base_test.c
index 21fb335814194e729aee928842ddc18bf58790b0..35f64832b869cc6d835337155b568888d62e24ef 100644 (file)
--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -97,14 +97,17 @@ TEST(abi_version)
        ASSERT_EQ(EINVAL, errno);
 }
 
-TEST(inval_create_ruleset_flags)
+/* Tests ordering of syscall argument checks. */
+TEST(create_ruleset_checks_ordering)
 {
        const int last_flag = LANDLOCK_CREATE_RULESET_VERSION;
        const int invalid_flag = last_flag << 1;
+       int ruleset_fd;
        const struct landlock_ruleset_attr ruleset_attr = {
                .handled_access_fs = LANDLOCK_ACCESS_FS_READ_FILE,
        };
 
+       /* Checks priority for invalid flags. */
        ASSERT_EQ(-1, landlock_create_ruleset(NULL, 0, invalid_flag));
        ASSERT_EQ(EINVAL, errno);
 
@@ -119,6 +122,22 @@ TEST(inval_create_ruleset_flags)
                  landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr),
                                          invalid_flag));
        ASSERT_EQ(EINVAL, errno);
+
+       /* Checks too big ruleset_attr size. */
+       ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, -1, 0));
+       ASSERT_EQ(E2BIG, errno);
+
+       /* Checks too small ruleset_attr size. */
+       ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, 0, 0));
+       ASSERT_EQ(EINVAL, errno);
+       ASSERT_EQ(-1, landlock_create_ruleset(&ruleset_attr, 1, 0));
+       ASSERT_EQ(EINVAL, errno);
+
+       /* Checks valid call. */
+       ruleset_fd =
+               landlock_create_ruleset(&ruleset_attr, sizeof(ruleset_attr), 0);
+       ASSERT_LE(0, ruleset_fd);
+       ASSERT_EQ(0, close(ruleset_fd));
 }
 
 /* Tests ordering of syscall argument checks. */