Date: Wed, 04 Jun 2003 13:25:35 -0300 From: "Daniel C. Sobral" <dcs@tcoip.com.br> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: arch@freebsd.org Subject: Re: Making a dynamically-linked root Message-ID: <3EDE1D7F.1090501@tcoip.com.br> In-Reply-To: <20030604152156.GB25240@Odin.AC.HMC.Edu> References: <20030603113927.I71313@cvs.imp.ch> <16092.35144.948752.554975@grasshopper.cs.duke.edu> <20030603115432.EGLB13328.out002.verizon.net@kokeb.ambesa.net> <20030603122226.BGPM11703.pop018.verizon.net@kokeb.ambesa.net> <3EDD81A4.B6F83135@mindspring.com> <3EDDF732.1060606@tcoip.com.br> <20030604152156.GB25240@Odin.AC.HMC.Edu>
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Brooks Davis wrote:
> On Wed, Jun 04, 2003 at 10:42:10AM -0300, Daniel C. Sobral wrote:
>
>>Terry Lambert wrote:
>>
>>>Mike Makonnen wrote:
>>>
>>>
>>>>2. What happens if I hose one of the libraries?
>>>
>>>I always love this one. The same thing that happens if you hose
>>>your shell, any of your kernel modules get corruptes, you hose
>>>your kernel, you hose any of the files that the boot loader looks
>>>in before actually loading the kernel, you hose init, or you hose
>>>mount, or any one of dozens of other files.
>>>
>>>It's not like linking shared gives you any kind of statistically
>>>significant increase in the number of single points of failure or
>>>the overall MTBF for the overall system.
>>
>>It doesn't? If /bin/sh is hosed, I use /bin/csh. If /bin/ls is hosed, I
>>use 'echo *'. If /boot/kernel/kernel gets hosed, I use
>>/boot/kernel.old/kernel. If a module gets hosed, I don't load it or use
>>the one in kernel.old. And so forth.
>>
>>If libc gets hosed, *ALL* programs stop working.
>>
>>So, I did not have any single point of failure for single file
>>corruption before. Now I do. But you claim there was not significant
>>increase, statistically speaking. Could you please point out what am I
>>missing?
>
> /rescue/sh
Sorry, Terry didn't answer /rescue/sh. He disclaimed the need for one
because, see, the risk we are incurring by having root dynamically
linked isn't greater.
Yes, /rescue/sh answer this question. But I'm not questioning the
proposal, I'm questioning Terry's answer to a valid question (which
*should* have been /rescue/sh).
--
Daniel C. Sobral (8-DCS)
Gerencia de Operacoes
Divisao de Comunicacao de Dados
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VIVO Centro Oeste Norte
Fones: 55-61-313-7654/Cel: 55-61-9618-0904
E-mail: Daniel.Capo@tco.net.br
Daniel.Sobral@tcoip.com.br
dcs@tcoip.com.br
Outros:
dcs@newsguy.com
dcs@freebsd.org
capo@notorious.bsdconspiracy.net
Your reasoning powers are good, and you are a fairly good planner.
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