Database Users

[TUT] Linux in chroot on your iconia

So, many of you want to run a full-size linux on your iconia. Unfortunately due to the fact that acer are a bunch of stupid mofos not releasing kernel source code and do not allow to flash unsigned ROMs we'll have to run it in chroot within android.
First thing to do is to get yourself a rootfs of linux. You can use angstrom, ubuntu.. I'm building debian using multistrap, the config is below. You'd better use pre-built ubuntu/backtrack and skip up to somewhere between steps 4 and 5, unless you have experience with dpkg and apt-get.
Code:
[General]
arch=armel
directory=/home/alexander/builds/multistrap
cleanup=false
retainsources=true
allowrecommends=false
noauth=true
unpack=true
aptsources=Grip
debootstrap=Debian
[Debian]
packages=screen openssh-server alsa-utils wireless-tools wpasupplicant nmap netcat
source=http://ftp.uk.debian.org/debian
keyring=debian-archive-keyring
suite=sid
[Grip]
packages=locales
keyring=emdebian-archive-keyring
source=http://www.emdebian.org/grip
suite=sid
Now we need to get it to iconia somehow. Running it from microsd would be incredibly slow and internal ssd is formatted to vfat. So let's loop mount it.
1. Create the loopback image
Code:
#700 mb
dd if=/dev/zero of=debian.img bs=10M count=70
mkfs.ext2 -f debian.img
2. Mount it as you always do.. on your desktop yet
Code:
mkdir /mnt/debian
mount -o loop -t ext2 debian.img /mnt/debian
3. Copy the desired files.. As a root user, you can cd to the rootfs (generated by multistrap) and
Code:
tar cvp . | tar xvp -C /mnt/debian
4. unmount the image.. (umount /mnt/debian) and copy to the /sdcard. I copy to the /sdcard/linux/debian.img. Also, I use the /sdcard/linux/uroot directory to mount the image on the tablet.
5. now, you need adb or terminal emulator and superuser permissions ('teh rewt')
Now let's make some script, name it android_sh and put it to /bin in /sdcard/linux/uroot. And make it executable (chmod +x /bin/android_sh)
Code:
#!/bin/bash
export PATH=/bin:/sbin:/usr/bin:/usr/sbin
export USER=root
export HOME=/root
export TERM=linux
if [ -z "`pidof Xtightvnc`" ] ; then
vncserver -geometry 1280x740 -depth 8
else
kill -9 `pidof Xtightvnc`
rm /tmp/.X11-unix/X*
rm /tmp/.X*lock
fi
/bin/bash -
Ok. now make another script, in /sdcard/linux
Code:
#!/bin/sh
LOOPBASE=/sdcard/linux
LOOPFILE=debian.img
LOOPTARGET=uroot
cd $LOOPBASE
if [ -z "`grep $LOOPBASE/$LOOPTARGET /proc/mounts`" ]; then
echo "mounting $LOOPFILE"
mount -o loop -t ext2 $LOOPBASE/$LOOPFILE $LOOPBASE/$LOOPTARGET
else
echo "$LOOPFILE already mounted"
fi
for i in dev proc sys
do
echo "processing $i"
if [ -z "`grep $LOOPBASE/$LOOPTARGET/$i /proc/mounts`" ]
then
echo "mounting $i"
mount -o bind /$i $LOOPBASE/$LOOPTARGET/$i
else
echo "$i already mounted"
fi
done
if [ -z "`grep $LOOPBASE/$LOOPTARGET/dev/pts /proc/mounts`" ]
then
mount -t tmpfs none $LOOPBASE/$LOOPTARGET/dev/pts
fi
echo "chroot into $LOOPBASE/$LOOPTARGET"
chroot $LOOPBASE/$LOOPTARGET /bin/android_sh
now, execute it (sh /sdcard/linux/chroot.sh). You should be in root shell now. If you're building debian using multistrap, configure the packages (dpkg-configure -a). Remember I told you to keep out of debian? Dash package is somewhat broken so you may need to lurk through mailing lists to make it install.. And you need to manually add your sid/testing mirrors to the aptitude config.
So what now? Install tightvnc server (in debian/ubuntu, use apt-get update; apt-get install tightvncserver), exit the shell and launch chroot.sh again.
If you're building rootfs yourself, don't forget to install some x desktop environment. I use lxde on debian, it is lightweight and starts automatically with tightvnc
Now, you can use the vnc client on android to connect to your X11. When chrooting, tightvnc wil tell you the number of x session, so use it as the last digit of the port (5901, 5902 etc). I welcome suggestions on how to improve the android_sh to cleanly kill all tightvnc servers and remove temporary files so that the port number is always the same
In the end you may or may not get something similiar to this:
http://img820.imageshack.us/img820/9076/img3159qm.jpg
P.S.
I recommend you to install Hacker's Keyboard which will give you the tab key, esc and arrows simultaneously and allow to use cool software like vim and emacs without pain
https://market.android.com/details?id=app-org.pocketworkstation.pckeyboard

U.B.D.Man...

Cool...But I got stucked at the first step. Where can I get debian.img?

you create a new file named debian.img using dd, then you format it to ext2 using mkfs.. well. you can just take backtrack image from xoom. essentially it's just ubuntu with some software added

I'm just curious why you chose ext2 as opposed to ext4? Given that the filesystem is actually a file on a filesystem, I sort of understand ext2, especially considering you can mount it with the ext4 driver now.

This probably sounds like a stupid question, but for some reason I cannot use bash?
It may be that my paths are not configured properly, but i dont have a bin at the "/" level. I have looked in /system/bin and /system/xbin, but have not found bash there either.
I installed busybox and have been able to perform root tasks, so I am not sure what I missed.

because.. you don't have bash.. you should have it in your chroot. if you need it in android, just install it (like http://forum.xda-developers.com/showthread.php?t=537827)

I installed bash according to the link you posted, but I still don't have a /bin outside of /system. I did change the above scripts to reflect this by saying:
#!/system/bin (but then I get the error 'event not found')
My prompt reads: "sh-3.2#" after reboot, which I understand is bash replacing the stock terminal.
I tried creating the /bin directory in the root, but even with root terminal, it said it was read only. Do I have to remount the root and then create a /bin directory?
When I rooted, I don't remember their being a lengthy discussion about bash installation, or the creation of a /bin directory.
I welcome all suggestions, as I am trying to learn more about the inner workings of the tablet, but still have little experience.

you need bash only in the linux in chroot and therefore do not need to modify scripts.
anyway,
mount -o remount,rw /system
cp bash /system/bin
chmod 755 /system/bin/bash
mount -o remount,ro /system
then you can start bash by typing 'bash' in shell

Hello,
I have tried and I still can't get it run. I am not used to Linux stuffs and scared that I may screwed up my tab. Can you please pack the required files and upload it so that we can follow easier? something like this http://www.secmaniac.com/may-2011/backtrack-5-on-motorola-xoom-in-10-minutes-or-less/ would be great.
Thank you.
PS: I sincerely want to get BackTrack on my tab so that I can run R on this

moved to http://forum.xda-developers.com/showthread.php?t=1094237

sp3dev said:
because.. you don't have bash.. you should have it in your chroot. if you need it in android, just install it (like http://forum.xda-developers.com/showthread.php?t=537827)
Click to expand...
Click to collapse
I ended up installing bash, but I still had problems with chroot and getting the scripts to run, so I decided to reverse what I was doing. In the process of trying to remove the bash shell and replace with the stock sh, I must have messed something up.
I tried a factory reset, and when I loaded back up again, I can't get wifi to connect. My suspicion is that there is at least two separate things wrong:
-My shell is somewhere in permission limbo or non-existant
I try running >adb shell and I get:
"- exec '/system/bin/sh' failed: No such file or directory (2) -"​
-The permissions on my wpa_supplicant are probably messed up, hence I can't connect to wifi
Any suggestions?

Well I tried a few more things:
-Tried copying over bash to /system/bin, got an error that it is a read-only file system. Funny, because I need shell (chmod?) in order to repair the shell, those bastards.
-Tried installing apk using adb, got same message about 'sh' missing. I think I will have to reflash a system.img, but I can't seem to find the Wifi-US with a working link.
Any help would be much appreciated.

Hey guys, could you upload and send me the link of a video of this working? Cause I love the idea of it but I'm not sure if its really practical
Sent from my A500 using XDA Premium App

Installing BackTrack5 onto the Motorola Atrix 4G

As I am not allowed to post this where it should be, this seems to be the next best place.
Hardware Needed:
* The Motorola Atrix 4G (without this you wont be going very far)
* Atleast a 4 Gb SD card
* a way of transfering data from your computer onto the SD card (The supplied USB cable or an SD adaptor)
Apps Needed:
* SuperUser (If your on this site, you most likely already have this)
* Just about any Terminal Emulator will work (I used Better Terminal Emulator Pro)
* Any VNC Viewing Client (I used androidVNC)
* A Busybox installer (I used Stericson's BusyBox installer)
Software used:
* I used the BackTrack5 version posted by msullivan, found **HERE**:
I used a slightly edited version of the bt file from the bundle
just copy and paste over the original bt file:
Code:
perm=$(id|cut -b 5)
if [ "$perm" != "0" ];then echo "This script requires root! Type: su"; exit; fi
busybox mount -o remount,rw /dev/block/mmcblk0p5 /system
export kit=/sdcard-ext/BT5
export bin=/system/bin
export mnt=/data/local/bt5
mkdir $mnt
export PATH=$bin:/usr/bin:/usr/local/bin:/usr/sbin:/bin:/usr/local/sbin:/usr/games:$PATH
export TERM=linux
export HOME=/root
if [ -b /dev/loop7 ]; then
echo "Loop device exists"
else
busybox mknod /dev/loop7 b 7 0
fi
#mount -o loop,noatime -t ext2 $kit/bt5.img $mnt
losetup /dev/block/loop7 $kit/bt5.img
mount -t ext2 /dev/block/loop7 $mnt
mount -t devpts devpts $mnt/dev/pts
mount -t proc proc $mnt/proc
mount -t sysfs sysfs $mnt/sys
busybox sysctl -w net.ipv4.ip_forward=1
echo "nameserver 8.8.8.8" > $mnt/etc/resolv.conf
echo "nameserver 8.8.4.4" >> $mnt/etc/resolv.conf
echo "127.0.0.1 localhost bt5" > $mnt/etc/hosts
echo "Ubuntu is configured with SSH and VNC servers that can be accessed from the IP:"
ifconfig eth0
echo " "
busybox chroot $mnt /bin/bash
echo "Shutting down BackTrack ARM"
umount $mnt/dev/pts
umount $mnt/proc
umount $mnt/sys
umount $mnt
losetup -d /dev/loop7
Installation Steps:
1. Make sure you have enough space to work with (atleast 4Gb).
2. Edit the bt file with the above coding.
3. Copy over the BT5 folder onto your SD card however you see fit, I just used a SD to USB adaptor that I got with my SD card.
4. Disconnect the USB cable if you have it connected.
5. open your Terminal emulator and type:
Code:
su <ENTER>
6. Type:
Code:
cd /sdcard-ext/BT5 <ENTER>
7. Type:
Code:
sh bt <ENTER>
8. The bt file should run, and leave you with a red command prompt.
Hit the home button.
9. Open your VNC Viewer and enter the login information.
Code:
Nickname: BackTrack5
Password: root
Address: 127.0.0.1
Port: 5901
The screen size still needs adjusting however as I believe it is set at 800×480 currently.

Sick. Just sick.
Cant wait to crack some Wifi with this. Anyone test this out and get a successful crack?

I haven't looked too far into it, however I do believe that this is almost useless as a "cracking" distro on ARM hardware. AFAIK many things don't/can't work. for instance injecting is a no go (real turn off for me, but that is what a netbook is for).

Until we get better drivers for the wifi, we don't have injection, or monitor mode. I've also found editing scripts can be a ***** because the on screen keyboard is either in the way, or the enter doesn't work as enter if using nano, running vi really hoses things up. My external bluetooth keyboard helps with this, but a bluetooth mouse while it works, is waaaaaaaaaaaaaaay (no really) too sensitive on the Atrix. Hooked up to an external monitor in webtop mode it works much better, but I've not tried running backtrack from there.

Yeah I did not even consider the ARM architecture. Very good point.
Do they make a Rosetta type app for Linux? Anyone know? That could at least help use get past the Architectural limits.
*edit*
Still not thinking straight, that app is for PPC users.

In the beginning where the script says "sdcard-ext/bt5" could I edit that to say "sdcard/bt5" in order to boot it from my internal phone memory?
Sent from my MB860 using XDA App

BravoMotorola said:
In the beginning where the script says "sdcard-ext/bt5" could I edit that to say "sdcard/bt5" in order to boot it from my internal phone memory?
Sent from my MB860 using XDA App
Click to expand...
Click to collapse
Yep.
stupid 10 character limit...

Exthero said:
As I am not allowed to post this where it should be, this seems to be the next best place.
Hardware Needed:
* The Motorola Atrix 4G (without this you wont be going very far)
* Atleast a 4 Gb SD card
* a way of transfering data from your computer onto the SD card (The supplied USB cable or an SD adaptor)
Apps Needed:
* SuperUser (If your on this site, you most likely already have this)
* Just about any Terminal Emulator will work (I used Better Terminal Emulator Pro)
* Any VNC Viewing Client (I used androidVNC)
* A Busybox installer (I used Stericson's BusyBox installer)
Software used:
* I used the BackTrack5 version posted by msullivan, found **HERE**:
I used a slightly edited version of the bt file from the bundle
just copy and paste over the original bt file:
Code:
perm=$(id|cut -b 5)
if [ "$perm" != "0" ];then echo "This script requires root! Type: su"; exit; fi
busybox mount -o remount,rw /dev/block/mmcblk0p5 /system
export kit=/sdcard-ext/BT5
export bin=/system/bin
export mnt=/data/local/bt5
mkdir $mnt
export PATH=$bin:/usr/bin:/usr/local/bin:/usr/sbin:/bin:/usr/local/sbin:/usr/games:$PATH
export TERM=linux
export HOME=/root
if [ -b /dev/loop7 ]; then
echo "Loop device exists"
else
busybox mknod /dev/loop7 b 7 0
fi
#mount -o loop,noatime -t ext2 $kit/bt5.img $mnt
losetup /dev/block/loop7 $kit/bt5.img
mount -t ext2 /dev/block/loop7 $mnt
mount -t devpts devpts $mnt/dev/pts
mount -t proc proc $mnt/proc
mount -t sysfs sysfs $mnt/sys
busybox sysctl -w net.ipv4.ip_forward=1
echo "nameserver 8.8.8.8" > $mnt/etc/resolv.conf
echo "nameserver 8.8.4.4" >> $mnt/etc/resolv.conf
echo "127.0.0.1 localhost bt5" > $mnt/etc/hosts
echo "Ubuntu is configured with SSH and VNC servers that can be accessed from the IP:"
ifconfig eth0
echo " "
busybox chroot $mnt /bin/bash
echo "Shutting down BackTrack ARM"
umount $mnt/dev/pts
umount $mnt/proc
umount $mnt/sys
umount $mnt
losetup -d /dev/loop7
Installation Steps:
1. Make sure you have enough space to work with (atleast 4Gb).
2. Edit the bt file with the above coding.
3. Copy over the BT5 folder onto your SD card however you see fit, I just used a SD to USB adaptor that I got with my SD card.
4. Disconnect the USB cable if you have it connected.
5. open your Terminal emulator and type:
Code:
su <ENTER>
6. Type:
Code:
cd /sdcard-ext/BT5 <ENTER>
7. Type:
Code:
sh bt <ENTER>
8. The bt file should run, and leave you with a red command prompt.
Hit the home button.
9. Open your VNC Viewer and enter the login information.
Code:
Nickname: BackTrack5
Password: root
Address: 127.0.0.1
Port: 5901
The screen size still needs adjusting however as I believe it is set at 800×480 currently.
Click to expand...
Click to collapse
I get an error when doing "sh bt".
I get "bt: 36: Syntax error: end of file unexpected (expecting "then")"

BravoMotorola said:
I get an error when doing "sh bt".
I get "bt: 36: Syntax error: end of file unexpected (expecting "then")"
Click to expand...
Click to collapse
Is your bt folder on your "internal" or external sd card? If it's the sdcard-ext, you'll need to edit the bt script to point to the correct location.

barry99705 said:
Is your bt folder on your "internal" or external sd card? If it's the sdcard-ext, you'll need to edit the bt script to point to the correct location.
Click to expand...
Click to collapse
Hmm, tried a lot of things, ended up going to the OP of the original Backtrack on Android thread and use his original file instead, working now. But now I have a new problem, (lol) how can I change the screen resolution of the BT5 GUI to match the Atrix's screen? I've looked all over for this. I just can't find out how...

BravoMotorola said:
Hmm, tried a lot of things, ended up going to the OP of the original Backtrack on Android thread and use his original file instead, working now. But now I have a new problem, (lol) how can I change the screen resolution of the BT5 GUI to match the Atrix's screen? I've looked all over for this. I just can't find out how...
Click to expand...
Click to collapse
once you start up backtrack, you need to edit /usr/bin/startvnc . Change that last line to
Code:
vncserver -geometry 940x520

barry99705 said:
once you start up backtrack, you need to edit /usr/bin/startvnc . Change that last line to
Code:
vncserver -geometry 940x520
Click to expand...
Click to collapse
Thanks and yes I did see that somewhere, I just had no clue what file to edit. So is it possible to install things like Flash on Firefox on here or is the no package installer for this? Gosh, sorry I'm asking so much...thanks for the help so far

BravoMotorola said:
Thanks and yes I did see that somewhere, I just had no clue what file to edit. So is it possible to install things like Flash on Firefox on here or is the no package installer for this? Gosh, sorry I'm asking so much...thanks for the help so far
Click to expand...
Click to collapse
Firefox is already installed. Not sure if flash is there since it's so insecure.

Laptop dock
After installing BT5 to Atrix 4G, can the laptop dock be used to run BT5?

I just wanted to throw a thanks out there to Exthero (since you only have 2!) for the start up script. Couldn't get it working until i used yours.
I'm having a blast with this

NISVermeer said:
After installing BT5 to Atrix 4G, can the laptop dock be used to run BT5?
Click to expand...
Click to collapse
easiest way is on wifi:
see what your ip is
Code:
$ ifconfig
example:
eth0: 192.168.1.3
use a vnc server on your computer connect to ip address in ifconfig (port 5901 default for this chroot)

anyone know if or where the atrix wireless drivers are for this?

[How to] Linux (Backtrack5) and OpenOffice3

Backtrack5 and OpenOffice3.0
xMemphisx said:
Backtrack (http://www.backtrack-linux.org)
Backtrack-Linux.org, home of the highest rated and acclaimed Linux security distribution to date. BackTrack is a Linux-based penetration testing arsenal that aids security professionals in the ability to perform assessments in a purely native environment dedicated to hacking. Regardless if you’re making BackTrack you Install BackTrack, boot it from a Live DVD or thumbdrive, the penetration distribution has been customized down to every package, kernel configuration, script and patch solely for the purpose of the penetration tester.
Here is a guide to getting ARM Backtrack Running on the Iconia A500 (tested on Wifi Only Version, running 3.0.1)
After much frustration I have gotten the GUI part of the backtrack 5 arm release working with the Motorola Xoom.
This has only been tested to work on the Iconia A500 . But it should work just fine with any other device that supports linux, and should work especially well on anything with a dual-core processor (G2X, Atrix, etc.)
Pre-requisites:
- Rooted Iconia A500
- Busybox installed (Find on market Busybox installer)
- androidVNC from the Android Market
- Terminal Emulator from the Android Market (which you should already have)
- Backtrack 5 for ARM with Gnome downloaded and setup (check the README file, and follow the instructions.)
Link: Backtrack 5 http://www.backtrack-linux.org/downloads/. This tutorial will assume you put Backtrack 5 in the folder /sdcard/BT5 like the README says.
Code:
Extract the zip file to your internal SDCARD folder (/SDCARD/BT5)
Open Terminal emulator and type
su
cd /sdcard/BT5
gunzip bt5.img.gz (take about 7-10mins)
sh bootbt
Code:
cd /sdcard/BT5
su
sh bootbt
BackTrack will start up in shell. You will get a red line that says "[email protected]:". To verify if you type:
Code:
ls pentest
It should echo back the folders in pentest, stuff like 'backdoors','database',etc.
At this point enter the following commands:
Code:
export USER=root
vncpasswd
When you type in 'vncpasswd' this is to the the password for the tightvncserver. Since I only connect locally I just use 'qwerty' for my password, and then confirm the password. [Edit] Apparently you can skip this step, as the default password for vnc is simply, 'toortoor' (root backwards, twice).
When it asks if you want to create a view only password just type 'n' and hit enter. After you have your password setup for vnc start the server up.
Code:
[COLOR="Red"]startvnc 1280x800[/COLOR]
When this happens you will get a message confirming that "New 'X' Desktop is localhost:1" and a bunch of other random stuff below it (it isn't important unless there are errors listed).
At this point, press the "HOME" button and then open the application "androidVNC".
-In the "Nickname" box, you can name it whatever you like.
-In the "password" entry, use your password (mine is 'qwerty').
-In the "Address" box you can type in localhost (or leave it blank).
****Change the port from 5900 to 5901.
I also recommend setting the color-depth to 24-bit. After that press the "connect" button, and bam! You're rocking Backtrack 5 on your Iconia A500!!
Code:
In order to exit:
- Go back to Terminal
- Type [B]stopvnc[/B]
- Type [B]exit[/B]
you are back to android terminal environment and ur androidvncviewer will get disconnected.
Click to expand...
Click to collapse
p-ille said:
I tested openoffice 3 and it works like a charm. It is not present in the original backtrack repository, so I had to add another source. I used the Debian repository. From the backtrack terminal I typed:
Code:
add-apt-repository deb *repository address* stable main contrib non-free
apt-get update
apt-get install openoffice.org
You can find the debian mirror for your country at
Code:
debian.org/mirror/list
Click to expand...
Click to collapse
For those who want to access SDCard/USBDrive from within BB5, please follow this:
p-ille said:
I did it!
To mount sdcard, external sd and usb storage in backtrack, you have to modify the bootbt script like this (changes in red):
Code:
perm=$(id|cut -b 5)
if [ "$perm" != "0" ];then echo "This Script Needs Root! Type : su";exit;fi
mount -o remount,rw /dev/block/mmcblk0p5 /system
export kit=/sdcard/BT5
export bin=/system/bin
export mnt=/data/local/mnt
[B][COLOR="Red"]export stor=$mnt/root/storage
export sdcard=$stor/sdcard
export extsd=$stor/external_sd
export usb=$stor/usb_storage[/COLOR][/B]
mkdir -p $mnt
export PATH=$bin:/usr/bin:/usr/local/bin:/usr/sbin:/bin:/usr/local/sbin:/usr/games:$PATH
export TERM=linux
export HOME=/root[I]
[COLOR="Blue"]export USER=root[/COLOR][/I]
if [ -b /dev/loop2 ]; then
echo "Loop device exists"
else
busybox mknod /dev/loop2 b 7 0
fi
mount -o loop,rw,noatime -t ext2 $kit/bt5.img $mnt[B][COLOR="Red"]
echo "mounting storage devices in $stor..."
mkdir -p $sdcard
mkdir -p $extsd
mkdir -p $usb
busybox mount --bind /mnt/sdcard $sdcard
busybox mount --bind /mnt/external_sd $extsd
busybox mount --bind /mnt/usb_storage $usb[/COLOR][/B]
mount -t devpts devpts $mnt/dev/pts
mount -t proc proc $mnt/proc
mount -t sysfs sysfs $mnt/sys
busybox sysctl -w net.ipv4.ip_forward=1
echo "nameserver 8.8.8.8" > $mnt/etc/resolv.conf
echo "127.0.0.1 localhost bt5" > $mnt/etc/hosts
busybox chroot $mnt /bin/bash
echo "Shutting down BackTrack ARM for Iconia A500"
[B][COLOR="Red"]umount $sdcard
umount $extsd
umount $usb[/COLOR][/B]
umount $mnt/dev/pts
umount $mnt/proc
umount $mnt/sys
umount $mnt
Click to expand...
Click to collapse

Very nice indeed, will try it out very soon.............

Awesome, just what I have been looking for. I will try this when I get home tonight!
Thanks

lpachuong said:
Here is a guide to getting ARM Backtrack Running on the Iconia A500 (tested on Wifi Only Version, running 3.1)
Click to expand...
Click to collapse
3.1? maybe you means 3.0.1?

After
export USER=root
Click to expand...
Click to collapse
You/can type
startvnc
Click to expand...
Click to collapse
without the need to -geometry 1280x800, and afterward after your session type
stopvnc
Click to expand...
Click to collapse
for a clean disconnect.
Just a faster easier way.

I got I/O errors while mounting devpts and sysfs (bootbt script)

peyotll said:
I got I/O errors while mounting devpts and sysfs (bootbt script)
Click to expand...
Click to collapse
I had the same errors when i had ubuntu installed/and was trying to do this along side.. what I had to do was factory reset (I did so to get rid of ubuntu, there's probably an easier way) then tried backtrack again with no problem

Agosh13 said:
3.1? maybe you means 3.0.1?
Click to expand...
Click to collapse
Hahahaha...I wish =)
Btw, please let me know if you have any special script/suggestion about this topic. I will update the original one so that everyone can get updated.
I'm trying to get OpenOffice running...sadly the ARM version is not that stable. Anyone has any resource on it?

Works perfectly! Thanks for this!

Thanks very much for this guide!
I'm having a strange issue though, hopefully someone can help. When I press the "m" key, rather than type the letter "m", it opens up the mail icon in the tool bar. Every other letter works fine, and I can't seem to find a way to edit this keyboard shortcut.
Anyone else have this issue, or now how to correct this?

thanks a lot - it will work for me without any error or something else
i use the latest update from acer (A500_1.141.01_EMEA_CUS7)

hmm, is there any trick to log off an turn off the system ? when i exit everthing an try to start again i will only see the backtrack wallpaper...
also i got an error in term-emu when i type in "exit".

I added the OP for how to exit.

Thanks for the guide, I have been waiting for something like this!
koprofile said:
Thanks very much for this guide!
I'm having a strange issue though, hopefully someone can help. When I press the "m" key, rather than type the letter "m", it opens up the mail icon in the tool bar. Every other letter works fine, and I can't seem to find a way to edit this keyboard shortcut.
Anyone else have this issue, or now how to correct this?
Click to expand...
Click to collapse
doble-tap (right click) the mail icon in the tool bar and choose to remove it from panel. It should remove the keyboard shortcut also.
lpachuong said:
Hahahaha...I wish =)
I'm trying to get OpenOffice running...sadly the ARM version is not that stable. Anyone has any resource on it?
Click to expand...
Click to collapse
I tested openoffice 3 and it works like a charm. It is not present in the original backtrack repository, so I had to add another source. I used the Debian repository. From the backtrack terminal I typed:
Code:
add-apt-repository deb *repository address* stable main contrib non-free
apt-get update
apt-get install openoffice.org
You can find the debian mirror for your country at
Code:
debian.org/mirror/list

Thank you very much for this guide.
It works like a charm.
Just one question.
I suppose you use a bluetooth keyboard, because the virtual one doesn't seem to work with Backtrack. But is it possible to use a mouse ? Because my big fingers don't match the tiny icons and menu choices !!!
Thanks again.

p-ille said:
Code:
add-apt-repository deb *repository address* stable main contrib non-free
apt-get update
apt-get install openoffice.org
You can find the debian mirror for your country at
Code:
debian.org/mirror/list
Click to expand...
Click to collapse
Thank you for ur script. I haven't had time to play with it due to exams.Anyway, I added them to the original post so that everyone can find it easier.
Regarding to the keyboard...i tried with usb keyboard and it worked fine. I have a BT keyboard but haven't tried it yet. I don't think the mouse will work bcz it is restricted by the VNCViewer

Hi
Tanks for tour tutorial, but i'm having some issue running backtrack:
Code:
# sh bootbt
Loop device exists
ioctl LOOP_SET_FD failed: Bad file number
mount: No such file or directory
mount: No such file or directory
mount: No such file or directory
net.ipv4.ip_forward = 1
bootbt: cannot create /data/local/mnt/etc/resolv.conf: directory nonexistent
bootbt: cannot create /data/local/mnt/etc/hosts: directory nonexistent
chroot: can't execute '/bin/bash': No such file or directory
Shutting down BackTrack ARM For Xoom
failed.
failed.
failed.
failed.
#
I did check the md5sum of the archive,ok. Busybox ok.
Tanks for your help.

When it asks if you want to create a view only password just type 'n' and hit enter. After you have your password setup for vnc start the server up.
Code:
Code:
startvnc 1280x800
When this happens you will get a message confirming that "New 'X' Desktop is localhost:1" and a bunch of other random stuff below it (it isn't important unless there are errors listed).
Click to expand...
Click to collapse
is it possible to use a different resolution? I tried to use 1280x768 (WXGA read on Wikipedia) but it didn't work.
Hi, Alberto

edit:
Now it works fine! thank you!
Sorry for my first post.
I just realize that I had confused the downloaded archive (.7 z, wich contain all stuff) and the compressed image (. gz), so I did not unpack image before running bootbt.
Unfortunately, the extraction of master archive did not work due to the soft used to extract .7z.
As i mentionned before I've checked the whole archive md5sum but did not check the extracted files.
bt5.img.gz was only 12.59 MB, extracted with androzip. (don't use it, at least for .7z!!)

interesting....
is the wifi adapter working in monitor mode???

[HowTo] homebrew your custom Ubuntu image for Iconia A500

I'm posting this in a new thread as requested...
There is a simple way to preapare a custom Ubuntu image file compiled for ARMEL with only the packages and functionalities you need.
For this procedure you will need
- a linux machine with working ADB (I tried it on a x64 ubuntu machine)
- a rooted Iconia A500 with busybox installed
- a little knowledge about what you're doing, but just a little.
1. Install Rootstock
on your linux machine, open up the terminal and type
Code:
sudo apt-get install rootstock
If you use at least Ubuntu Karmic, it should automatically pull all the dependencies, otherwise you'll have to manually install Qemu and a newer debootstrap.
2. Create the tarball
you're ready to download the packages and prepare the tarball.
Remember: rootstock doesn't automatically include a kernel, so you'll have to manually include it in the package list
Here's the syntax for a basic run (run "man rootstock" for all the parameters):
Code:
sudo rootstock \
--fqdn [COLOR="Red"]<YOUR_CHOSEN_HOSTNAME>[/COLOR] \
--login [COLOR="Red"]<YOUR_CHOSEN_USERNAME>[/COLOR] \
--password [COLOR="Red"]<YOUR_CHOSEN_PASSWORD>[/COLOR] \
--imagesize [COLOR="Red"]<IMAGE_SIZE_IN_GB>[/COLOR]G \
--seed [COLOR="Red"]<LIST_OF_PACKAGES_SEPARATED_BY_COMMAS>[/COLOR]
Here's an example for a 2GB image with OMAP kernel and a complete Kubuntu-desktop distribution:
Code:
sudo rootstock \
--fqdn ubuntu \
--login ubuntu \
--password ubuntu \
--imagesize 2G \
--seed linux-image-omap,kubuntu-desktop
In --seed you can specify whatever package you want. You could start with just the kernel and build-essential, then add whatever you need. A good start could be like this:
Code:
--seed linux-image-omap,build-essential,lxde,tightvncserver,openssh-server
This will give you a running ubuntu with a very light, performance-oriented desktop environment (lxde) with ssh and vnc.
Remember: It's still possible to add new packages with apt-get from chroot whenever you want.
Once you have chosen the packages you want, you just have to press enter and rootstock will automatic download the packages and prepare the tarball.
You'll end up with a file named "armel-rootfs-<TIMESTAMP>.tgz"
3. Prepare the img file
This is very easy and quick:
Code:
dd if=/dev/zero of=arm_ubuntu.img bs=1MB count=0 seek=[COLOR="Red"]<SIZE_IN_MB>[/COLOR]
The seek parameter defines the size in MB of your image. make it as large as you want, it should at least be as big as the size you selected for the tarball (2G in my example).
Remember: 1 GB = 1024 MB
Now we format the image. Since the Iconia supports ext4 file system, we can use it!
Code:
mkfs.ext4 -F arm_ubuntu.img
You may want to pass other flags to define advanced options, labels and reserved blocks, but this is the least you need to make it work.
4. Decompress
Now we have to mount the img file in a loop:
Code:
sudo mount -o loop arm_ubuntu.img /mnt
and decompress the tarball into it.
Code:
sudo tar -C /mnt -zxf armel-rootfs-<TIMESTAMP>.tgz
It's done!
[OPTIONAL]
This is the right time to put custom scripts in /mnt/usr/bin like this one to start the vnc server with the correct geometry for the A500:
Code:
#!/bin/bash
rm -fr /tmp/.X1*
vncserver -geometry 1280x752
NB: the A500 screen is 1280x800, but the honeycomb statusbar (1280x48px) is always on top. To avoid panning to show the ubuntu menu bar, we just subtract those 48 pixels from the ubuntu vertical resolution.
Now we just umount it.
Code:
sudo umount /mnt
5. Load on the tablet and get it running
The script to mount and boot is derived from the one in the Backtrack 5 Thread.
Load the img file on the tablet with
Code:
adb push arm_ubuntu.img /sdcard/ubuntu/arm_ubuntu.img
It will take a loooong time and there's no progress bar, so just have faith.
Next, we prepare the boot script. The only thing you need to do is to put your username in (the one you chose in rootstock).
Code:
perm=$(id|cut -b 5)
if [ "$perm" != "0" ];then echo "This Script Needs Root! Type : su";exit;fi
mount -o remount,rw /dev/block/mmcblk0p5 /system
export kit=/sdcard/ubuntu
export bin=/system/bin
export mnt=/data/local/mnt
mkdir -p $mnt
export PATH=$bin:/usr/bin:/usr/local/bin:/usr/sbin:/bin:/usr/local/sbin:/usr/games:$PATH
export TERM=linux
export USER=[B][COLOR="Red"]<THE_USERNAME_YOU_CHOSE_BEFORE>[/COLOR][/B]
export HOME=/home/$USER
export stor=$mnt/home/$USER/storage
export sdcard=$stor/sdcard
export extsd=$stor/external_sd
export usb=$stor/USB_storage
if [ -b /dev/loop2 ]; then
echo "Loop device exists"
else
busybox mknod /dev/loop2 b 7 0
fi
mount -o loop,rw,noatime -t ext4 $kit/arm_ubuntu.img $mnt
echo "mounting storage devices in $stor..."
mkdir -p $sdcard
mkdir -p $extsd
mkdir -p $usb
busybox mount --bind /mnt/sdcard $sdcard
busybox mount --bind /mnt/external_sd $extsd
busybox mount --bind /mnt/usb_storage $usb
mount -t devpts devpts $mnt/dev/pts
mount -t proc proc $mnt/proc
mount -t sysfs sysfs $mnt/sys
busybox sysctl -w net.ipv4.ip_forward=1
echo "nameserver 8.8.8.8" > $mnt/etc/resolv.conf
echo "127.0.0.1 localhost ubuntu" > $mnt/etc/hosts
busybox chroot $mnt /bin/bash
echo "Shutting down Ubuntu ARM for Iconia A500"
umount $sdcard
umount $extsd
umount $usb
umount $mnt/dev/pts
umount $mnt/proc
umount $mnt/sys
umount $mnt
Once done, we can save the file as startubuntu and adb push it to the tab. (the same folder as the img is fine)
Done! We run it by invoking the startubuntu script from the android terminal emulator (must be in superuser mode)
I hope you found this how-to useful.

And we use this distro via our tablets ssh client?
EDIT: sorry my bad Never read code while tired

Hi,
i am running ubuntu natty.
and i got this error:
...
Setting up wireless-crda (1.13) ...
Setting up linux-image-2.6.38-8-omap (2.6.38-8.42) ...
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.38-8-omap
/bin/df: Warning: cannot read table of mounted file systems: No such file or directory
Not sure if it is fatal. rootstock has created successful the rootfs

reida010 said:
Hi,
i am running ubuntu natty.
and i got this error:
...
Setting up wireless-crda (1.13) ...
Setting up linux-image-2.6.38-8-omap (2.6.38-8.42) ...
Running depmod.
update-initramfs: Generating /boot/initrd.img-2.6.38-8-omap
/bin/df: Warning: cannot read table of mounted file systems: No such file or directory
Not sure if it is fatal. rootstock has created successful the rootfs
Click to expand...
Click to collapse
Same happened to me. Totally not fatal. the tarball is good.
For everyone out there:
I would like your help with testing. I have a crash on start problem with firefox in all the images I tried. Does any of you have the same issue?

Hi,
i get
Code:
Loop device exists
then i did
Code:
echo "$kit/arm_ubuntu.img"
and i get
Code:
/sdcard/ubuntu/arm_ubuntu.img
but then i get
Code:
mount: cannot setup loop device: No such file or directory
any ideas?
Because of firefox.
i read a while ago a tweet about a bug in meego and ubuntu in firefox for arm.
when it is this bug then you should try firefox trunk because it is fixed.
but i cannot refind it :-(
edit:
bugzilla.mozilla.org/show_bug.cgi?id=634594

I was searching for that today, thanks mate. Nice Tutorial =D

reida010 said:
Hi,
but then i get
Code:
mount: cannot setup loop device: No such file or directory
any ideas?
edit:
bugzilla.mozilla.org/show_bug.cgi?id=634594
Click to expand...
Click to collapse
i have the same problem. You should make loop file not in /mnt/sdcard, but in /mnt/external_sd.

Kh_Shad said:
i have the same problem. You should make loop file not in /mnt/sdcard, but in /mnt/external_sd.
Click to expand...
Click to collapse
That would apply only if you put the image file in the external MicroSD, if you have put it in the internal memory (as described in the tutorial) the path is /mnt/sdcard. Also, the speed of the internal memory is better.

Hi,
i found out how i can make it work
but it's strange.
i don't works when i do
Code:
sh ./startubuntu
but with this it works fine:
Code:
/system/bin/sh ./startubuntu
Is this maybe because i didn't use adb.
Someone told me that copy paste might change the permissions (what the ****! really?)
on my tablet startubuntu is not executable.
And it doesn't change anything when i do chmod 755 startubuntu
but after moving it to /system/bin chmod works fine.
After then i can always just run
Code:
su
startubuntu
and ubuntu is up and running.
(many thanks by the way :-D)

Sorry guys, will this method produce a native Ubuntu install similair to how Wubi works? Or is this like the chroot methods were we have to VNC into the distro from within Android?

It is native!!!
but you need vnc to access the xserver
On my n900 i used xephyr but i don't think this is working for android because afaik they don't use X. (n900 is so cool for linux geeks ;-D)
edit:
if you mean with 'native' that it will replace android -> no -> it is a chroot

Yeah that answered my question. Thank you
I'm not going to bother until there is a native distro running with full system resources. I guess with the current bootloader situation that day may never come :-(

It failed in creating the image for me... and it seems like a error in the package linux-image-2.6.38-8-omap
[TRIM]
Need to get 37.4 MB of archives.
After this operation, 98.3 MB of additional disk space will be used.
Get:1 //ports.ubuntu.com/ubuntu-ports/ natty/main wireless-crda armel 1.13 [15.0 kB]
Get:2 //ports.ubuntu.com/ubuntu-ports/ natty/main linux-image-2.6.38-8-omap armel 2.6.38-8.42 [19.8 MB]
Get:3 //ports.ubuntu.com/ubuntu-ports/ natty/main devio armel 1.2-1build1 [16.9 kB]
Get:4 //ports.ubuntu.com/ubuntu-ports/ natty/main flash-kernel armel 2.28ubuntu19 [13.1 kB]
Get:5 //ports.ubuntu.com/ubuntu-ports/ natty/universe kubuntu-mobile armel 1.218 [2720 B]
Get:6 //ports.ubuntu.com/ubuntu-ports/ natty/main linux-firmware all 1.52 [17.5 MB]
Get:7 //ports.ubuntu.com/ubuntu-ports/ natty/main linux-image-omap armel 2.6.38.8.22 [2394 B]
Fetched 37.4 MB in 5min 29s (113 kB/s)
Selecting previously deselected package wireless-crda.
(Reading database ... 9309 files and directories currently installed.)
Unpacking wireless-crda (from .../wireless-crda_1.13_armel.deb) ...
Selecting previously deselected package linux-image-2.6.38-8-omap.
Unpacking linux-image-2.6.38-8-omap (from .../linux-image-2.6.38-8-omap_2.6.38-8.42_armel.deb) ...
Done.
Selecting previously deselected package devio.
Unpacking devio (from .../devio_1.2-1build1_armel.deb) ...
Selecting previously deselected package flash-kernel.
Unpacking flash-kernel (from .../flash-kernel_2.28ubuntu19_armel.deb) ...
Selecting previously deselected package kubuntu-mobile.
Unpacking kubuntu-mobile (from .../kubuntu-mobile_1.218_armel.deb) ...
Selecting previously deselected package linux-firmware.
Unpacking linux-firmware (from .../linux-firmware_1.52_all.deb) ...
Selecting previously deselected package linux-image-omap.
Unpacking linux-image-omap (from .../linux-image-omap_2.6.38.8.22_armel.deb) ...
Setting up wireless-crda (1.13) ...
Setting up linux-image-2.6.38-8-omap (2.6.38-8.42) ...
Running depmod.
Failed to run depmod
dpkg: error processing linux-image-2.6.38-8-omap (--configure):
subprocess installed post-installation script returned error exit status 1
Setting up devio (1.2-1build1) ...
No apport report written because MaxReports is reached already
Setting up flash-kernel (2.28ubuntu19) ...
Setting up kubuntu-mobile (1.218) ...
E: Second stage build in chroot failed !
E: Please see the log to see what went wrong.
Setting up linux-firmware (1.52) ...
I: Cleaning up...
dpkg: dependency problems prevent configuration of linux-image-omap:
linux-image-omap depends on linux-image-2.6.38-8-omap; however:
Package linux-image-2.6.38-8-omap is not configured yet.
dpkg: error processing linux-image-omap (--configure):
dependency problems - leaving unconfigured
No apport report written because MaxReports is reached already
Errors were encountered while processing:
linux-image-2.6.38-8-omap
linux-image-omap
E: Sub-process /usr/bin/dpkg returned an error code (1)
I: Umounting temporary Image

I keep getting a failure also!
Ceck out both of my log files below.

tholmewood said:
Sorry guys, will this method produce a native Ubuntu install similair to how Wubi works? Or is this like the chroot methods were we have to VNC into the distro from within Android?
Click to expand...
Click to collapse
It is a chroot/vnc method, currently the only method available to run linux on this device, because of the locked bootloader... I seriously hope for a chance to dual boot in the future.

i was wondering what packages are needed in order to create an ubuntu netbook Edition? Is the A500 powerful enough for that kind of interface?

Thought you guys might be interested in this post.
http://forum.xda-developers.com/showpost.php?p=15156543&postcount=64
Have fun!

@p-ille
Have you tried firefox daily?
Did it work?

reida010 said:
@p-ille
Have you tried firefox daily?
Did it work?
Click to expand...
Click to collapse
Not really, my job is killing me these days... I'll try it asap!
sent from my Iconia A500

p-ille said:
Not really, my job is killing me these days... I'll try it asap!
sent from my Iconia A500
Click to expand...
Click to collapse
You realize what a pain that tutorial is to follow? Could you please provide a pre built image at least if asking for scripts is probably way too much?

[Guide] Debian on Android (rooted)

Hi, this is a guide to install a Linux image on your rooted Android phone with the debootstrap + chroot method.
In this guide, we'll install a Debian image, but the steps are practically the same, with a few tweaks.
If you need help to install a Linux image, feel free to ask on this thread.
For this guide, all credit goes to them:
http://linux-expert.net/?Trucs_et_astuces___Android___Tutoriel_%3A_Chroot_Debian (in french)
http://forum.xda-developers.com/showthread.php?p=45457799
http://forum.xda-developers.com/showthread.php?t=2312013
http://forum.xda-developers.com/showthread.php?t=631389
http://forum.xda-developers.com/showthread.php?t=1418546
http://forum.xda-developers.com/showpost.php?p=5671794&postcount=124
VNC
________________
I. On your PC
So first, you have to create the .img file that will contain the OS.
In a GNU/Linux environment (PC) and with the root permissions, type these commands:
Code:
# mkdir debian
# dd if=/dev/zero of=wheezy-armhf.img bs=1M count=0 seek=2048
[COLOR="Red"](NOTE: "of=" will be the name of our .img file and "seek=" the size of the file (MB). Here, we create a file named "wheezy-armhf.img" of 2 GB)[/COLOR]
# mkfs.ext4 -F wheezy-armhf.img
# mount -o loop wheezy-armhf.img /debian
Then we have to fill up the filesystem.
Code:
# debootstrap --foreign --arch=armhf wheezy debian/
# umount debian
Finally, move it to your SD Card. In my case, I moved it on /data/local/
II. On your phone
On your phone, in a terminal emulator and with the root permissions, type the following commands:
Code:
# mount -o rw,remount rootfs /
# export LINUXROOT=/linux
(NOTE: here we'll install Debian on the root of the internal memory, in "/", but we can also install Debian on the SD Card or in /data/loca/linux by changing the path after "LINUXROOT=")
# mkdir $LINUXROOT
# busybox mknod /dev/block/loop100 b 7 100
# losetup /dev/block/loop100 /sdcard/wheezy-armhf.img
# mount -t ext4 /dev/block/loop100 $LINUXROOT
# chroot $LINUXROOT /bin/sh
# export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
# /debootstrap/debootstrap --second-stage
The debootstrap's second part should start. Grab a cup of coffee while it's working!
When it's finish, leave the chroot by typing
Code:
# exit
# su
Let's mount the filesystem. We're close!
Code:
# mount -t proc none /proc
# mount -t sysfs none /sys
# mount -o bind /dev /dev
# mount -t devpts none /dev/pts
Now, we have to set the environment variable. Ensure that you have set the correct path of LINUXROOT in case you've chosen another path than /linux.
Code:
# export LINUXROOT=/linux
# export TMPDIR=/tmp
# export USER=root
# export HOME=/root
# export SHELL=/bin/bash
# export TERM=linux
# export LC_ALL=C
# export LANGUAGE=C
# export LANG=C
And finally, chroot.
Code:
# chroot $LINUXROOT /bin/bash
su
Welcome on Debian!
III. DNS and Mirrors
Set a DNS. We'll set the free Google DNS but you can set yours if you want.
Code:
echo -e "domain local\nsearch local\n" >> /etc/resolv.conf
echo -e "# DNS Google\nnameserver 8.8.8.8\nnameserver 8.8.4.4\n" >> /etc/resolv.conf
You can add mirrors to your sources.list if you want. I'm french so I added french mirrors:
Code:
# echo -e "## Debian Wheezy sources.list\n\n" > /etc/apt/sources.list
# echo -e "## Debian.org FR mirror\ndeb http://ftp.fr.debian.org/debian/ wheezy main contrib non-free\ndeb-src http://ftp.fr.debian.org/debian/ wheezy main contrib non-free\n\n" >> /etc/apt/sources.list
# echo -e "## Debian security updates\ndeb http://security.debian.org/ wheezy/updates main contrib non-free\ndeb-src http://security.debian.org/ wheezy/updates main contrib non-free\n >> /etc/apt/sources.list
IV. VNC
To access your Debian in a graphical environment from your PC or your phone, you have to set up a VNC Server and install a Desktop Environment. Let's install VNC and LXDE.
We'll follow the steps described on the LXDE wiki:
Code:
su
# apt-get update
# apt-get install lxde
# apt-get install tightvncserver
Set up the VNC server by typing the following command, which will ask you to set two passwords (let the second password if you want):
Code:
# vncserver
Kill the session:
Code:
# vncserver -kill :1
Go to /root/.vnc/ and edit the xstartup file: comment out #/etc/X11/xsession and add these two lines:
icewm
lxsession
Click to expand...
Click to collapse
To start a VNC session, type "vncserver -geometry x". For the Nexus 4, we would type "vncserver -geometry 1184x768"
To access your Desktop Environment from your phone, download android-vnc-viewer and launch it.
In the password field, type your password. In the address field, type "127.0.0.1", in port type "5901" and select 24-bit color (4bpp).
V. Script
I've made three scripts to mount, launch and unmount Debian. Whenever you reboot your phone, you'll have to mount Debian, set the environment variables and chroot.
VI. Credit
All credit goes to them:
http://linux-expert.net/?Trucs_et_astuces___Android___Tutoriel_%3A_Chroot_Debian (in french)
http://forum.xda-developers.com/showthread.php?t=2312013
http://forum.xda-developers.com/showthread.php?t=631389
http://forum.xda-developers.com/showthread.php?t=1418546
http://forum.xda-developers.com/showpost.php?p=5671794&postcount=124
VNC
Sorry for my bad english, I hope this will help

EDIT: Feel free to correct me!

Hi, I have 2021 updates, if someone interested. Tested with rooted LineageOS 17 (selinux permissive - not sure if required, my ROM is permissive, didn't set it explicitly):
for 32-bit ARM, ext4 created by 64-bit Linux didn't work, obviously there is some 64-bit feature that was not supported at least with my kernel (3.14). I've in the end created the FS on the Android, but using "-O '^64bit'" could be sufficient in the Linux. UPDATE: I've in the end used F2FS instead of EXT4.
above mknod+losetup+mount didn't work for me (neither 'mount -o loop -t ext4 <img>'), I've used 'mount -t ext4 $(losetup -sf /sdcard/stable-armhf.img) $LINUXROOT' in the end (obviously the device name needs to be saved somewhere if one wants to cleanly umount)
there was issue with network access denied even if you are root, see here. I've fixed it by creating the group 'inet/3003' in the chroot and issuing 'newgrp inet' inside it (more details in the link).
Anyways, thanks a lot for the above instructions, it helped me much!