linux-kernel - Re: [PATCH 04/27] Restrict /dev/mem and /dev/kmem when the kernel is locked down

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Message-ID: <alpine.LFD.2.20.1710210321440.9435@t440>
Date:   Sat, 21 Oct 2017 03:21:54 +0400 (+04)
From:   James Morris <james.l.morris@...cle.com>
To:     David Howells <dhowells@...hat.com>
cc:     linux-security-module@...r.kernel.org, gnomes@...rguk.ukuu.org.uk,
        linux-efi@...r.kernel.org, matthew.garrett@...ula.com,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        jforbes@...hat.com
Subject: Re: [PATCH 04/27] Restrict /dev/mem and /dev/kmem when the kernel
 is locked down

On Thu, 19 Oct 2017, David Howells wrote:

> From: Matthew Garrett <matthew.garrett@...ula.com>
> 
> Allowing users to write to address space makes it possible for the kernel to
> be subverted, avoiding module loading restrictions.  Prevent this when the
> kernel has been locked down.
> 
> Signed-off-by: Matthew Garrett <matthew.garrett@...ula.com>
> Signed-off-by: David Howells <dhowells@...hat.com>


Reviewed-by: James Morris <james.l.morris@...cle.com>

-- 
James Morris
<james.l.morris@...cle.com>