Description of problem: cfengine 2.1.20 has a buffer overflow problem related to
IP V6 interfaces and certain constructs in the configuration files of cfengine
itself.  The problem gets detected by the stack-protector feature of gcc 4.1.
Details below, have reported problem, it is fixed upstream.


Version-Release number of selected component (if applicable): 2.1.20-1.fc5


How reproducible:


Steps to Reproduce:
1. Install cfengine.
2. Into /var/cfengine/inputs/cfagent.conf, put a classes: x = (
IPRange(10.0.0.1-3) )
3. Make sure you machine has an IPv6 interface
4. cfagent --no-splay -v
  
Actual results: Stack smashing detected: cfagent terminated

Expected results: Complete run of cfengine


Additional info: The bug is a buffer overflow problem, where a (long) IPv6
address does not fit into a buffer set to be too small.  The problem was fixed
by Mark Burgess with revision 240 of file item.c.  The isolated diff to revision
207 of item.c is attached as a patch, I have rebuilt the package, installed and
verified successfully.
The patch contains only changes to item.c between revisions 207 and 240.
The problem is somewhat urgent as cfengine in a non-trivial setup will not run.
For my upstream bug report, see
http://cfengine.org/pipermail/bug-cfengine/2006-April/000011.html