[PATCH 5.18 779/879] selftests/landlock: Extend tests for minimal valid attribute size

[Greg Kroah-Hartman]

From: Mickaël Salaün <mic@xxxxxxxxxxx>

commit 291865bd7e8bb4b4033d341fa02dafa728e6378c upstream.

This might be useful when the struct landlock_ruleset_attr will get more
fields.

Cc: Shuah Khan <shuah@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220506160820.524344-4-mic@xxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mickaël Salaün <mic@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 tools/testing/selftests/landlock/base_test.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/tools/testing/selftests/landlock/base_test.c
+++ b/tools/testing/selftests/landlock/base_test.c
@@ -35,6 +35,8 @@ TEST(inconsistent_attr)
 	ASSERT_EQ(EINVAL, errno);
 	ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, 1, 0));
 	ASSERT_EQ(EINVAL, errno);
+	ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, 7, 0));
+	ASSERT_EQ(EINVAL, errno);
 
 	ASSERT_EQ(-1, landlock_create_ruleset(NULL, 1, 0));
 	/* The size if less than sizeof(struct landlock_attr_enforce). */
@@ -47,6 +49,9 @@ TEST(inconsistent_attr)
 	ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, page_size + 1, 0));
 	ASSERT_EQ(E2BIG, errno);
 
+	/* Checks minimal valid attribute size. */
+	ASSERT_EQ(-1, landlock_create_ruleset(ruleset_attr, 8, 0));
+	ASSERT_EQ(ENOMSG, errno);
 	ASSERT_EQ(-1, landlock_create_ruleset(
 			      ruleset_attr,
 			      sizeof(struct landlock_ruleset_attr), 0));