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

[Christian Brauner <brauner@kernel.org>]

Test that anonymous inodes cannot be open()ed.

Signed-off-by: Christian Brauner <brauner@kernel.org>
---
 tools/testing/selftests/filesystems/anon_inode_test.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/testing/selftests/filesystems/anon_inode_test.c b/tools/testing/selftests/filesystems/anon_inode_test.c
index 486496252ddd..e8e0ef1460d2 100644
--- a/tools/testing/selftests/filesystems/anon_inode_test.c
+++ b/tools/testing/selftests/filesystems/anon_inode_test.c
@@ -48,5 +48,22 @@ TEST(anon_inode_no_exec)
 	EXPECT_EQ(close(fd_context), 0);
 }
 
+TEST(anon_inode_no_open)
+{
+	int fd_context;
+
+	fd_context = sys_fsopen("tmpfs", 0);
+	ASSERT_GE(fd_context, 0);
+
+	ASSERT_GE(dup2(fd_context, 500), 0);
+	ASSERT_EQ(close(fd_context), 0);
+	fd_context = 500;
+
+	ASSERT_LT(open("/proc/self/fd/500", 0), 0);
+	ASSERT_EQ(errno, ENXIO);
+
+	EXPECT_EQ(close(fd_context), 0);
+}
+
 TEST_HARNESS_MAIN
 

-- 
2.47.2