[redhat-lspp] Re: [PATCH 2/3] Re: MLS enforcing PTYs, sshd, and newrole

[Linda Knippers]

> devices.txt in kernel documentation. 
> 2176 <http://www.mjmwired.net/kernel/Documentation/devices.txt#2176>    136-143 char    Unix98 PTY slaves 

Since that document has multiple devices with the same major, I wonder if its
safer to fstatfs() the fd and make sure the f_type is the devpts fs magic
number.  It only seems to be defined in fs/devpts/inode.c though.

> #define DEVPTS_SUPER_MAGIC 0x1cd1

devpts is mounted on /dev/pts before single user mode so it seems to always
be there unless someone unmounts it.  If you try to ssh in without /dev/pts
mounted the ssh hangs.

-- ljk