The following was filed automatically by setroubleshoot:

Summary:

SELinux is preventing /usr/bin/kdm "write open" access on
/root/.xsession-errors-:0.

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/.xsession-errors-:0 [ file ]
Source                        kdm
Source Path                   /usr/bin/kdm
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           kdm-4.3.1-1.fc12
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.31-2.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Permissive
Plugin Name                   catchall
Host Name                     (removed)
Platform                      Linux (removed) 2.6.31-2.fc12.i686 #1 SMP Thu Sep
                              10 00:41:03 EDT 2009 i686 athlon
Alert Count                   1
First Seen                    Sat 12 Sep 2009 07:49:06 AM BST
Last Seen                     Sat 12 Sep 2009 07:49:06 AM BST
Local ID                      faecb214-6f84-44af-bcc6-62a375460dac
Line Numbers                  

Raw Audit Messages            

node=(removed) type=AVC msg=audit(1252738146.205:108): avc:  denied  { write open } for  pid=6926 comm="kdm" name=".xsession-errors-:0" dev=dm-0 ino=6739 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(1252738146.205:108): arch=40000003 syscall=5 success=yes exit=3 a0=83fc970 a1=80c1 a2=180 a3=0 items=0 ppid=6891 pid=6926 auid=0 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=5 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:file { write open };