[PATCH 7/9] selftests/filesystems: add second test for anonymous inodes

[Christian Brauner <brauner@kernel.org>]

Test that anonymous inodes cannot be chmod()ed.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 tools/testing/selftests/filesystems/anon_inode_test.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tools/testing/selftests/filesystems/anon_inode_test.c b/tools/testing/selftests/filesystems/anon_inode_test.c
index f2cae8f1ccae..7c4d0a225363 100644
--- a/tools/testing/selftests/filesystems/anon_inode_test.c
+++ b/tools/testing/selftests/filesystems/anon_inode_test.c
@@ -22,5 +22,18 @@ TEST(anon_inode_no_chown)
 	EXPECT_EQ(close(fd_context), 0);
 }
 
+TEST(anon_inode_no_chmod)
+{
+	int fd_context;
+
+	fd_context = sys_fsopen("tmpfs", 0);
+	ASSERT_GE(fd_context, 0);
+
+	ASSERT_LT(fchmod(fd_context, 0777), 0);
+	ASSERT_EQ(errno, EOPNOTSUPP);
+
+	EXPECT_EQ(close(fd_context), 0);
+}
+
 TEST_HARNESS_MAIN
 

-- 
2.47.2