The following was filed automatically by setroubleshoot:

Summary:

SELinux is preventing /usr/bin/kdm "write" access on /root.

Detailed Description:

[SELinux is in permissive mode. This access was not denied.]

SELinux denied access requested by kdm. It is not expected that this access is
required by kdm and this access may signal an intrusion attempt. It is also
possible that the specific version or configuration of the application is
causing it to require additional access.

Allowing Access:

You can generate a local policy module to allow this access - see FAQ
(http://fedora.redhat.com/docs/selinux-faq-fc5/#id2961385) Please file a bug
report.

Additional Information:

Source Context                system_u:system_r:xdm_t:s0-s0:c0.c1023
Target Context                system_u:object_r:admin_home_t:s0
Target Objects                /root [ dir ]
Source                        kdm
Source Path                   /usr/bin/kdm
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           kdm-4.3.1-4.fc12
Target RPM Packages           filesystem-2.4.30-2.fc12
Policy RPM                    selinux-policy-3.6.31-3.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Permissive
Plugin Name                   catchall
Host Name                     (removed)
Platform                      Linux (removed) 2.6.31-12.fc12.i686 #1 SMP Mon Sep
                              14 02:27:06 EDT 2009 i686 athlon
Alert Count                   126
First Seen                    Fri 11 Sep 2009 12:28:29 PM BST
Last Seen                     Wed 16 Sep 2009 04:25:48 PM BST
Local ID                      30f48aa6-1ceb-4e58-a62f-a3274613e02e
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1253114748.194:26): avc:  denied  { write } for  pid=1337 comm="kdm" name="root" dev=dm-0 ino=261 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir

node=(removed) type=AVC msg=audit(1253114748.194:26): avc:  denied  { add_name } for  pid=1337 comm="kdm" name=".Xauthority-c" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir

node=(removed) type=AVC msg=audit(1253114748.194:26): avc:  denied  { create } for  pid=1337 comm="kdm" name=".Xauthority-c" scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=file

node=(removed) type=AVC msg=audit(1253114748.194:26): avc:  denied  { write open } for  pid=1337 comm="kdm" name=".Xauthority-c" dev=dm-0 ino=7603 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:admin_home_t:s0 tclass=file

node=(removed) type=SYSCALL msg=audit(1253114748.194:26): arch=40000003 syscall=5 success=yes exit=3 a0=bfb0cf0b a1=c1 a2=180 a3=1 items=0 ppid=1295 pid=1337 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=1 comm="kdm" exe="/usr/bin/kdm" subj=system_u:system_r:xdm_t:s0-s0:c0.c1023 key=(null)


audit2allow suggests:

#============= xdm_t ==============
allow xdm_t admin_home_t:dir { write add_name };
allow xdm_t admin_home_t:file { write create open };