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

[joeyli]

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