linux-kernel - Re: [PATCH 2/2] Add dev.mem.restricted sysctl

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Message-ID: <20081116010914.1285b884@kopernikus.site>
Date:	Sun, 16 Nov 2008 01:09:14 +0100
From:	Bernhard Walle <bwalle@...e.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 2/2] Add dev.mem.restricted sysctl

* Alan Cox [2008-11-16 00:07]:
>
> On Sun, 16 Nov 2008 01:03:43 +0100
> Bernhard Walle <bwalle@...e.de> wrote:
> 
> > When CONFIG_STRICT_DEVMEM is set, live debugging is not possible with the
> > crash utility (see http://people.redhat.com/~anderson). For distributors
> > who ship a generic kernel it's difficult: Disabling CONFIG_STRICT_DEVMEM
> > is possible, but in general the protection provided by CONFIG_STRICT_DEVMEM
> > is useful. However, live debugging should be still neceessary.
> 
> Why not just turn strictmem off - as you've correctly demonstrated its
> completely useless and always was.
> 
> A switchable configurable piece of turd is still at the end of the day a
> piece of turd.

Well, I think that option makes sense to protect the system
from processes that *accidentally* read/write to the wrong memory
location (like the X server that always runs as root).


Regards,
Bernhard
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