Description of problem:
On a vanilla RHEL 6.1 system installed on HP Proliant hardware and using a serial console via the VSP ilo, booting to Single User Mode results in this error message on the console:

type=1400 audit(1296260632.174:5): avc:  denied  { write } for  pid=1544 comm="sulogin" path="/dev/pts/0" dev=devpts ino=3 scontext=system_u:system_r:sulogin_t:s0 tcontext=system_u:object_r:devpts_t:s0 tclass=chr_file

This prevents the user from getting the normal prompt:

Give root password for maintenance
(or type Control-D to continue):

Setting selinux mode to permissive or disabled fixes the problem.

Version-Release number of selected component (if applicable):
# sestatus
SELinux status:                 enabled
SELinuxfs mount:                /selinux
Current mode:                   enforcing
Mode from config file:          enforcing
Policy version:                 24
Policy from config file:        targeted
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 6.1 (Santiago)
#

How reproducible:

Steps to Reproduce:
1. Configure the system with serial console output via the HP ILO Virtual Serial Port. 

2. Edit grub menu or select single user mode grub entry.

3. Wait until init calls sulogin to prompt for password then hand out a shell prompt.
  
Actual results:
type=1400 audit(1296260632.174:5): avc:  denied  { write } for  pid=1544 comm="sulogin" path="/dev/pts/0" dev=devpts ino=3 scontext=system_u:system_r:sulogin_t:s0 tcontext=system_u:object_r:devpts_t:s0 tclass=chr_file

and no password prompt is displayed to the user

Expected results:
a password prompt like so:

Give root password for maintenance
(or type Control-D to continue):

Additional info: