xterm: Error 18, errno 13

[Javier Valencia]

Hi all, i don't know what mailing list to use, there are lots of them in 
xorg site!

Well, lately, i've coded a kernel module that disable write access on 
/bin inode, this means you can't create/delete entries in /bin inode, 
but you can read and execute all files in it.

All binaries work, but not xterm. The error i get is:
  
   xterm: Error 18, errno 13: Permission denied
   Reason: spawn: open() failed on ptsname

If i disable my module, xterm works again.
Why is xterm writing on /bin inode? or, what's happening here?
Thanks.