Joseph, I get the same error with the "generic" kernel (using ubuntu-gnome-13.04-desktop-i386.iso):
$ cat /proc/version_signature Ubuntu 3.8.0-19.29-generic 3.8.8
$ lsb_release -d Description: Ubuntu 13.04
$ gcc seccomp-filter.c $ ./a.out execve(): Operation not permitted status = -1
Joseph, I get the same error with the "generic" kernel (using ubuntu- gnome-13. 04-desktop- i386.iso) :
$ cat /proc/version_ signature
Ubuntu 3.8.0-19.29-generic 3.8.8
$ lsb_release -d
Description: Ubuntu 13.04
$ gcc seccomp-filter.c
$ ./a.out
execve(): Operation not permitted
status = -1