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Date:   Wed, 25 Oct 2017 15:07:30 +0800
From:   joeyli <>
To:     David Howells <>
Cc:     Alexei Starovoitov <>,,,,,,,, Daniel Borkmann <>,
        "David S. Miller" <>,,
        Gary Lin <>
Subject: 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:
> 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

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