fix: test case ut_lind_fs_open_existing_parentdirectory_and_nonexisti…

…ng_file

src/safeposix/syscalls/fs_calls.rs

@@ -43,7 +43,18 @@ impl Cage {
     *   Then return virtual fd
     */
     pub fn open_syscall(&self, path: &str, oflag: i32, mode: u32) -> i32 {
+        // Validate oflag for unsupported or invalid flags
+        if (oflag & 0o20000) != 0 {
+            // Check for an invalid combination like using S_IFCHR which indicates
+            // character device creation but is being used with O_CREAT.
+            return syscall_error(Errno::EINVAL, "open", "Invalid oflag specified for file opening");
+        }
 
+        // Validate mode for invalid permission bits (only valid ones are allowed)
+        if (mode & !0o777) != 0 {
+            // If there are invalid bits in mode, return error
+            return syscall_error(Errno::EPERM, "open", "Invalid permission bits specified in mode");
+        }
         // Convert data type from &str into *const i8
         let relpath = normpath(convpath(path), self);
         let relative_path = relpath.to_str().unwrap();

src/tests/fs_tests.rs

@@ -3241,6 +3241,8 @@ pub mod fs_tests {
             cage.open_syscall(path, O_CREAT, invalid_mode),
             -(Errno::EPERM as i32)
         );
+        let _ = cage.unlink_syscall("/dir/file");
+        let _ = cage.rmdir_syscall("/dir");
 
         assert_eq!(cage.exit_syscall(libc::EXIT_SUCCESS), libc::EXIT_SUCCESS);
         lindrustfinalize();