Can't change partition table anymore
Daniel O'Connor
doconnor at gsoft.com.au
Sun Apr 3 20:05:25 PDT 2005
On Mon, 4 Apr 2005 12:27, Andrey Chernov wrote:
> On Mon, Apr 04, 2005 at 11:45:17AM +0930, Daniel O'Connor wrote:
> > Altering the MBR while you have a partition mounted is potentially quite
> > dangerous.
>
> Don't say "dangerous" for _root_ user. Is there any purpose left for being
> root anymore? According to your logic, all root operations should be
> disabled by some unknown undocumented sysctls because it is too dangerous
> to be the root. Better kill yourself than to be the root.
Why chflags noschg libc and the kernel then?
Why have any warnings on anything?
> > The reason it was possible in the past was because there was no
> > protection against this kind of thing.
>
> Does anybody asks for protection here? It was not me. It was not majority
> of Unix sysadmins. Such kind of protection should be turned off by default
> in case it even exists as the toy for some paranoid people.
I'm not sure that is the case.
> > Use boot0cfg and the FreeBSD bootloader instead?
>
> boot0cfg not works (I assume the reason is the same).
>
> I can't write FreeBSD bootloader because reinstalled Windows overwrite it
> with standard MBR and sysinstall don't allow to write bootloader anymore.
> The only thing I not try yet in that situation was 'dd' - I was too lasy
> to find needed byte.
Strange, I can run boot0cfg fine here..
[inchoate 12:34] ~ >sudo boot0cfg -Bv -o nopacket /dev/ad0
# flag start chs type end chs offset size
1 0x00 0: 1: 1 0x06 63: 11:63 63 64197
2 0x00 4: 0: 1 0x0f 891:254:63 64260 30716280
3 0x80 892: 0: 1 0xa5 127:254:63 30780540 86429700
version=1.0 drive=0x80 mask=0xf ticks=182
options=nopacket,update,nosetdrv
default_selection=F1 (Slice 1)
[inchoate 12:34] ~ >sudo boot0cfg -Bv -o packet /dev/ad0
# flag start chs type end chs offset size
1 0x00 0: 1: 1 0x06 63: 11:63 63 64197
2 0x00 4: 0: 1 0x0f 891:254:63 64260 30716280
3 0x80 892: 0: 1 0xa5 127:254:63 30780540 86429700
version=1.0 drive=0x80 mask=0xf ticks=182
options=packet,update,nosetdrv
default_selection=F1 (Slice 1)
[inchoate 12:34] ~ >uname -a
FreeBSD inchoate.localdomain 6.0-CURRENT FreeBSD 6.0-CURRENT #1: Thu Mar 31 11:28:52 CST 2005 darius at inchoate.localdomain:/usr/src/sys/i386/compile/INCHOATE i386
[inchoate 12:34] ~ >mount
/dev/ad0s3a on / (ufs, local)
devfs on /dev (devfs, local)
/dev/ad0s3e on /usr (ufs, local, soft-updates)
/dev/ad0s3d on /var (ufs, local, soft-updates)
procfs on /proc (procfs, local)
linprocfs on /usr/compat/linux/proc (linprocfs, local)
--
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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