On Sun, Mar 15, 2009 at 7:43 AM, Mario Vukelic <mario.vukelic at dantian.org> wrote: > On Sun, 2009-03-15 at 10:57 +0200, Dotan Cohen wrote: >> cat: /dev/mem: Operation not permitted > > I'm pretty sure this is a restriction enforced by AppArmor. It's a feature. Ubuntu kernels are compiled with CONFIG_STRICT_DEVMEM.