I can confirm the sample exploit will segfault on athlon on a bare system (would likely be patchable), but will work as supplied on a XenU.
Segfault: Linux xxxx 2.6.23.9-85.fc8 #1 SMP Fri Dec 7 15:49:59 EST 2007 i686 athlon i386 GNU/Linux
Exploitable: Linux xxxx 2.6.21-2952.fc8xen #1 SMP Mon Nov 19 07:06:55 EST 2007 i686 athlon i386 GNU/Linux
I can confirm the sample exploit will segfault on athlon on a bare system (would
likely be patchable), but will work as supplied on a XenU.
Segfault: Linux xxxx 2.6.23.9-85.fc8 #1 SMP Fri Dec 7 15:49:59 EST 2007 i686
athlon i386 GNU/Linux
Exploitable: Linux xxxx 2.6.21-2952.fc8xen #1 SMP Mon Nov 19 07:06:55 EST 2007
i686 athlon i386 GNU/Linux