Date: Wed, 3 Nov 2004 17:59:59 -0800
From: Mitchell Blank Jr <mitch@sfgoth.com>
To: Russell Miller <rmiller@duskglow.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: is killing zombies possible w/o a reboot?
Message-ID: <20041104015959.GA54786@gaz.sfgoth.com>
References: <200411030751.39578.gene.heskett@verizon.net> <200411031901.28977.rmiller@duskglow.com> <87654m4clz.fsf@asmodeus.mcnaught.org> <200411031945.20894.rmiller@duskglow.com>
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Russell Miller wrote:
> Couldn't ring 1 be used to make 
> sure an errant driver doesn't drop the kernel, at least on x86 machines?

Not really -- drivers could still do things like mis-program their associated
hardware making it do DMA writes all over kernel memory (just as one example)

Basically it'd add a lot of complexity (and inefficiency) without adding
much real safety.

-Mitch
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