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Date:   Wed, 25 Oct 2017 15:07:30 +0800
From:   joeyli <jlee@suse.com>
To:     David Howells <dhowells@redhat.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@gmail.com>,
        linux-security-module@vger.kernel.org, gnomes@lxorguk.ukuu.org.uk,
        linux-efi@vger.kernel.org, matthew.garrett@nebula.com,
        gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
        jforbes@redhat.com, Daniel Borkmann <daniel@iogearbox.net>,
        "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
        Gary Lin <GLin@suse.com>
Subject: Re: [PATCH 18/27] bpf: Restrict kernel image access functions when
 the kernel is locked down
Message-ID: <20171025070730.GH8550@linux-l9pv.suse>
References: <20171020164343.e5mlq7ukskfjmlpp@linux-rasp2>
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 <150842463163.7923.11081723749106843698.stgit@warthog.procyon.org.uk>
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 <20171019221829.7m5nczg3ltqmhzom@ast-mbp>
 <2582.1508486928@warthog.procyon.org.uk>
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On Mon, Oct 23, 2017 at 03:53:00PM +0100, David Howells wrote:
> jlee@suse.com 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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