linux-kernel - Re: [PATCH 01/24] Add the ability to lock down access to the running kernel image

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Message-ID: <7367.1523468945@warthog.procyon.org.uk>
Date:   Wed, 11 Apr 2018 18:49:05 +0100
From:   David Howells <dhowells@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     dhowells@...hat.com, torvalds@...ux-foundation.org,
        linux-man@...r.kernel.org, linux-api@...r.kernel.org,
        jmorris@...ei.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH 01/24] Add the ability to lock down access to the running kernel image

Randy Dunlap <rdunlap@...radead.org> wrote:

> > +	  drivers from functioning because allowing manual configuration of
> > +	  hardware parameters is forbidden, lest a device be used to access the
> > +	  kernel by DMA.  This mostly applies to ISA devices.
> 
> 	Is DMA from non-ISA devices OK, or did I miss seeing that patch?

The issue is where you can directly command a device to do DMA, possibly by
using the wrong driver.  Ask Alan Cox.

David