Hi On Mon, Mar 23, 2015 at 11:29 AM, <[email protected]> wrote: > >> Wait, what's wrong with the existing functionality? > > Userspace programms for screensavers can potentially be bypassed > - if my scrennsaver dies, for example by segfault, my screen is unlocked > - Redirection is only possible in Kernel, because a vt switch can only > be prevented there > Also it would make the implementation of a Secure-Acess-Key possible > (could also redirect to VT12)
By moving these calls into the kernel, you don't make them necessarily fail-safe. This can all be implemented in user-space. By switching to a dedicated VT (say, VT12) and running VT_SETMODE+VT_PROCESS, you lock the machine. You can now implement your screensaver. If you run a spawner-process, you're even safe if your screensaver crashes. Thanks David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
