Message-ID: <418A8CD2.3050107@tmr.com>
Date: Thu, 04 Nov 2004 15:10:58 -0500
From: Bill Davidsen <davidsen@tmr.com>
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To: Mitchell Blank Jr <mitch@sfgoth.com>
CC: Russell Miller <rmiller@duskglow.com>, linux-kernel@vger.kernel.org
Subject: Re: is killing zombies possible w/o a reboot?
References: <200411031945.20894.rmiller@duskglow.com><200411031945.20894.rmiller@duskglow.com> <20041104015959.GA54786@gaz.sfgoth.com>
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Mitchell Blank Jr wrote:
> 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.

It would be nice on x86 to run ring 1 for kernel debugging, getting 
faults at appropriate points. Sorry, I'm an old MULTICS guy, wish 
Honeywell would OS it.

-- 
    -bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
  last possible moment - but no longer"  -me
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