Re: [PATCH 18/27] bpf: Restrict kernel image access functions when the kernel is locked down

On Mon, Oct 23, 2017 at 03:53:00PM +0100, David Howells wrote:

jlee-IBi9RG/b67k@public.gmane.org wrote:

quoted

hm... patch 4 only prevents write_mem() but not read_mem().
Or I missed anything?

Actually, yes, as it happens, patch 11 prevents you from even opening /dev/mem
and /dev/kmem by locking down open of /dev/port.  So I've moved this bit to
patch 4, simplified and posted a new variant for patch 4.

Thank you for pointing out!

Joey Lee