I just saw this on todays rawhide.  Not sure what triggered it.
I'm not sure why pt_chown needs to mmap the zero page. Jakub ?



Summary:

SELinux is preventing /usr/libexec/pt_chown "mmap_zero" access on <Unknown>.

Detailed Description:

SELinux denied access requested by pt_chown. The current boolean settings do not
allow this access. If you have not setup pt_chown to require this access this
may signal an intrusion attempt. If you do intend this access you need to change
the booleans on this system to allow the access.

Allowing Access:

Confined processes can be configured to run requiring different access, SELinux
provides booleans to allow you to turn on/off access as needed. The boolean
mmap_low_allowed is set incorrectly.
Boolean Description:
Allow certain domains to map low memory in the kernel


Fix Command:

# setsebool -P mmap_low_allowed 1

Additional Information:

Source Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Context                unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Objects                None [ memprotect ]
Source                        pt_chown
Source Path                   /usr/libexec/pt_chown
Port                          <Unknown>
Host                          vaio
Source RPM Packages           glibc-common-2.10.90-24
Target RPM Packages           
Policy RPM                    selinux-policy-3.6.32-24.fc12
Selinux Enabled               True
Policy Type                   targeted
MLS Enabled                   True
Enforcing Mode                Enforcing
Plugin Name                   catchall_boolean
Host Name                     vaio
Platform                      Linux vaio 2.6.31.1-56.fc12.x86_64 #1 SMP Tue Sep
                              29 16:16:22 EDT 2009 x86_64 x86_64
Alert Count                   5
First Seen                    Fri 18 Sep 2009 03:09:17 PM EDT
Last Seen                     Mon 12 Oct 2009 11:19:55 AM EDT
Local ID                      eb5c499a-75d0-4fb6-a380-1a4f8671a238
Line Numbers                  

Raw Audit Messages            

node=vaio type=AVC msg=audit(1255360795.327:17): avc:  denied  { mmap_zero } for  pid=2112 comm="pt_chown" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=memprotect

node=vaio type=AVC msg=audit(1255360795.327:17): avc:  denied  { mmap_zero } for  pid=2112 comm="pt_chown" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=memprotect

node=vaio type=AVC msg=audit(1255360795.327:17): avc:  denied  { mmap_zero } for  pid=2112 comm="pt_chown" scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tcontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 tclass=memprotect

node=vaio type=SYSCALL msg=audit(1255360795.327:17): arch=c000003e syscall=125 success=no exit=-14 a0=7fffd6aac014 a1=0 a2=7fffd4dc4e80 a3=7fff82542f20 items=0 ppid=1950 pid=2112 auid=500 uid=500 gid=500 euid=0 suid=0 fsuid=0 egid=500 sgid=500 fsgid=500 tty=(none) ses=1 comm="pt_chown" exe="/usr/libexec/pt_chown" subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)