Date: Sat, 14 Jun 2003 20:15:11 -0700
From: Joshua Oreman <oremanj@webserver.get-linux.org>
To: kAlunya <nick@hostel.com.ua>
Cc: questions@freebsd.org
Subject: Re: 5.1-Release: Write operation on enire ad{0,1,2,...} with mounted partition[s]
Message-ID: <20030615031511.GA681@webserver.get-linux.org>
In-Reply-To: <200306150204.h5F24WAa014139@nick.en>
References: <200306150204.h5F24WAa014139@nick.en>
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On Sun, Jun 15, 2003 at 05:04:32AM +0300 or thereabouts, kAlunya seemed to write:
> Hello, Core-Team!
This is the freebsd-questions mailing list.
>
> As shortly said in ${SUBJECT}, there is a question.
> In 5.1 Release thereis a situation:
> # whoami
> root
> # dd if=/dev/ad0 of=sect0_copy count=1
> ..........it is ok........
> # dd if=sect0_copy of=/dev/ad0
> dd: /dev/ad0: Operation not permitted
That's at the device level.
> # rm -rf / ????? :)
That's at the filesystem level. There's an important difference.
>
> What is going on with permition to write my boot sector back on ad0?
> So image repeats when I am in single mode with / mounted as RO
> Is it ok with driver?
> >From one side - it's ok, FreeBSD says: "Hm... Thereis mounted things on this device! ;( Go away from my ad0!!!"
> >From other side... Am I r00t on 127.0.0.1??? :((
> I _DO WANT_ this operation. But Free doesn't...
It's GEOM.
Google the archives for allow_shooting_into_my_foot.
There's a patch to make this a sysctl-configurable behavior.
-- Josh
>
> Is it good with she?
> -------------------------
> With best wishes, Nick.
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