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On Sat, 22 Jan 2011, Philipp Haselwarter wrote:

> I chmod 0640'ed /etc/sudoers on my N900 and closed the terminal -.-
> sudo gainroot/chmod/... fails complaining about the permissions, the gui
> package manager does so silently.
> Can't mount the filesystem root offline on another device to chmod 0440
> back (?), can't login as root locally, ssh to localhost seems to work but I
> don't have the slightest idea about the root password.
>
> Any way to avoid a reflash?

You can boot another system. For example Meego:

1. Download any u-boot image (for example the one from here:
http://al.robotfuzz.com/~al/maemo/u-boot/u-boot.bin ) and flash it
(as a kernel):

flasher-3.5 -f -k u-boot.bin


2. Prepare a uSD card for meego according to instructions here:
http://wiki.meego.com/ARM/N900/Install/MMC

3. Boot into meego, mount the N900 root filesystem (ubifs on mtd5), and
fix the problem

4. Reflash kernel by downloading the firmware image and using the
command

flasher-3.5 -f -F RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin --flash-only=kernel



--
Matan Ziv-Av. matan@svgalib.org


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On Fri, Jan 21, 2011 at 5:29 PM, Philipp Haselwarter
<philipp.haselwarter@gmx.de> wrote:
> I chmod 0640'ed /etc/sudoers on my N900 and closed the terminal -.-
> sudo gainroot/chmod/... fails complaining about the permissions, the gui
> package manager does so silently.
> Can't mount the filesystem root offline on another device to chmod 0440
> back (?), can't login as root locally, ssh to localhost seems to work but I
> don't have the slightest idea about the root password.
>
> Any way to avoid a reflash?

The root password should be the one you created when you installed the
rootsh package. If you forgot it, then...

I have not tried it, but you might be able to use a rescue initrd like
the one described here to gain access to your rootfs:
http://wiki.meego.com/ARM/N900/Using_Rescue_Initrd

There are also a few things that could have helped, had you installed
them ahead of time, like backupmenu, or if you have NITdroid or MeeGo
in a dual-boot environment you might be able to use them to edit your
file permissions.

Good luck!
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Hi!

rootsh package does not modify root password, but openssh does.

Cheers, Tumi

----- Original message -----
> On Fri, Jan 21, 2011 at 5:29 PM, Philipp Haselwarter
> <philipp.haselwarter@gmx.de> wrote:
> > I chmod 0640'ed /etc/sudoers on my N900 and closed the terminal -.-
> > sudo gainroot/chmod/... fails complaining about the permissions, the
> > gui package manager does so silently.
> > Can't mount the filesystem root offline on another device to chmod 0440
> > back (?), can't login as root locally, ssh to localhost seems to work
> > but I don't have the slightest idea about the root password.
> >
> > Any way to avoid a reflash?
>
> The root password should be the one you created when you installed the
> rootsh package. If you forgot it, then...
>
> I have not tried it, but you might be able to use a rescue initrd like
> the one described here to gain access to your rootfs:
> http://wiki.meego.com/ARM/N900/Using_Rescue_Initrd
>
> There are also a few things that could have helped, had you installed
> them ahead of time, like backupmenu, or if you have NITdroid or MeeGo
> in a dual-boot environment you might be able to use them to edit your
> file permissions.
>
> Good luck!
> _______________________________________________
> maemo-users mailing list
> maemo-users@maemo.org
> https://lists.maemo.org/mailman/listinfo/maemo-users

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"PH" == Paul Hartman <paul.hartman+maemo@gmail.com> writes:

PH> On Fri, Jan 21, 2011 at 5:29 PM, Philipp Haselwarter
PH> <philipp.haselwarter@gmx.de> wrote:
>> I chmod 0640'ed /etc/sudoers on my N900 and closed the terminal -.-
>> sudo gainroot/chmod/... fails complaining about the permissions, the
>> gui package manager does so silently. Can't mount the filesystem
>> root offline on another device to chmod 0440 back (?), can't login as
>> root locally, ssh to localhost seems to work but I don't have the
>> slightest idea about the root password.
>>
>> Any way to avoid a reflash?

PH> The root password should be the one you created when you installed
PH> the rootsh package. If you forgot it, then...

...I'm kind of screwed, right.

PH> I have not tried it, but you might be able to use a rescue initrd
PH> like the one described here to gain access to your rootfs:
PH> http://wiki.meego.com/ARM/N900/Using_Rescue_Initrd

Got it booted, but it seems that the rescue initrd doesn't contain
chmod. Too bad.

Furthermore I had a really hard time with the keyboard;
the only keys I was able to use were [a-zA-Z<>], no dashes, no slashes
(the modifier key seems to just get ignored).
Maybe I could use the chmod on the rootfs? Still, if I can neither type
"-w" nor "440" that's no use.

PH> There are also a few things that could have helped, had you
PH> installed them ahead of time, like backupmenu, or if you have
PH> NITdroid or MeeGo in a dual-boot environment you might be able to
PH> use them to edit your file permissions.

PH> Good luck!

thanks!

--
Philipp Haselwarter

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"MZ" == Matan Ziv-Av <matan@svgalib.org> writes:
---8<---[snipped 11 lines]---8<---

MZ> You can boot another system. For example Meego:

MZ> 1. Download any u-boot image (for example the one from here:
MZ> http://al.robotfuzz.com/~al/maemo/u-boot/u-boot.bin ) and flash it
MZ> (as a kernel):

MZ> flasher-3.5 -f -k u-boot.bin


MZ> 2. Prepare a uSD card for meego according to instructions here:
MZ> http://wiki.meego.com/ARM/N900/Install/MMC

Right now I'm trying to get someone to borrow me a microSD card that can
hold the image; the smallest one seems to be ~1.8GB and I only have a
1GB card.
Are there smaller images available that I missed?

MZ> 3. Boot into meego, mount the N900 root filesystem (ubifs on mtd5),
MZ> and fix the problem

MZ> 4. Reflash kernel by downloading the firmware image and using the
MZ> command

MZ> flasher-3.5 -f -F RX-51_2009SE_20.2010.36-2_PR_COMBINED_MR0_ARM.bin
MZ> --flash-only=kernel

--
Philipp Haselwarter

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To wrap it up:
Meego let me down, I finally reflashed.
The problem was the ubifs used on the maemo root. Couldn't get it mounted
in meego.
Most of the backup-restore worked fine, a bunch of apps are missing.

So, no way to access the rootfs without maemo; mission failed.

--
Philipp Haselwarter

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