Description of problem:
The k3b application attempted to change the access protection of memory (e.g., allocated using malloc). This is a potential security problem. Applications should not be doing this. Applications are sometimes coded incorrectly and request this permission. The SELinux Memory Protection Tests web page explains how to remove this requirement. If k3b does not work and you need it to work, you can configure SELinux temporarily to allow this access until the application is fixed.

Version-Release number of selected component (if applicable):
Name       : k3b
Arch       : x86_64
Version    : 1.0.5
Release    : 6.fc10

How reproducible:
SELinux configured like this:
System Default Enforcing Mode = Enforcing
Current Enforcing Mode = Enforcing
System Default Policy Type = Targeted
... and have installed k3b-extras-freeworld from RPMFusion.

Steps to Reproduce:
1. Enable SELinux as it's shown above
2. Login into the Gnome desktop
3. Run k3b
  
Actual results:
k3b starts but didn't load plugins provided by k3b-extras-freeworld

Expected results:
Be able to use plugins provided by k3b-extras-freeworld. It means possibility to burn audio CDs from MP3 files for example.

Additional info:
In Fedora 9 was everything OK.
Now I'm using this workaround:
chcon -t unconfined_execmem_exec_t '/usr/bin/k3b'