[Mono-list] Does System.Security.Permissions.FileIOPermission work?

Yawar Amin yawar.amin at gmail.com
Sun Apr 20 19:20:36 EDT 2008

Hi all,

I'm running Mono 1.2.4 on Ubuntu 7.10. I've been trying to use the
System.Security.Permissions.FileIOPermission class to `demand' write
access to my home directory and all its parent directories (i.e.
/home, /). Here's a sample script based on my understanding of the
security permissions concept:

// test_security_permissions.cs
using System.IO;
using System.Security.Permissions;

class Test_Security_Permissions {
  Demands write access to all parents of this directory. Framework
  is supposed to throw an exception if access is not granted.
  static void demand_write_access_to_all_parents(string dir_arg) {
    DirectoryInfo curr_dir = new DirectoryInfo(dir_arg);

    (new FileIOPermission(FileIOPermissionAccess.Write,
    System.Console.WriteLine("Successfully demanded write access to
{0}", curr_dir.FullName);
    if (curr_dir.FullName != curr_dir.Root.FullName) {

  public static void Main() {

What's happening is that it seems to successfully `get' write access
to all these directories:

yawar at yawar-laptop:~/code$ gmcs test_security_permissions.cs /t:exe &&
mono test_security_permissions.exe
Successfully demanded write access to /home/yawar/code
Successfully demanded write access to /home/yawar
Successfully demanded write access to /home
Successfully demanded write access to /
yawar at yawar-laptop:~/code$

But obviously I don't have write access to /home and /:

yawar at yawar-laptop:~/code$ ls -ldh / /home
drwxr-xr-x 21 root root 4.0K 2008-04-13 23:08 /
drwxr-xr-x  3 root root 4.0K 2008-04-14 03:01 /home
yawar at yawar-laptop:~/code$

Could someone be kind enough to run this on their own machine and/or
explain what I'm doing wrong?



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