Unable to chroot

mikedeatworld · 10-23-2006, 02:28 PM

I created a directoy /mnt/knx/master/KNOPPIX

And I what to setup a "jail" like environment, and use chroot. When I run chroot I get this error:

ddevbox:/mnt/knx/source# chroot /mnt/knx/source/KNOPPIX
chroot: cannot run command `/bin/bash': No such file or directory

And ideas?

Mara · 10-23-2006, 03:07 PM

When you're chrooting an user, the whole environment is needed under that dir - basic tools, libraries etc, because chroot makes the normal ones unaccessible. What do you have in the dir you're chrooting to?

mikedeatworld · 10-23-2006, 03:16 PM

I've copied all files from a KNOPPIX CD that a tutorial called for.

I'm on Section 14.

http://www.knoppix.net/wiki/Knoppix_Remastering_Howto

I am using the following wiki @ http://www.knoppix.net/wiki/Knoppix_...or_Remastering

To remaster Knoppix v. 5.0.1

I have setup a Debian Sarge host system where I will do most of the remastering. This system is stable and running fine.

I have followed the instructions without incident up until the point, where I get an error in Section 14.

"# Now you can "chroot" into the copied KNOPPIX"
miked@ddevbox:/mnt/knx/source/KNOPPIX$ is my path

When I run chroot, I get this error:

ddevbox:/mnt/knx/source# chroot /mnt/knx/source/KNOPPIX
chroot: cannot run command `/bin/bash': No such file or directory

To troubleshoot, I followed
http://poornam.com/articles_troubleshooting.php

I have tried to see if my libraries were setup correctly:

Code:

ddevbox:/home# ldd /bin/bash
        libncurses.so.5 => /lib/libncurses.so.5 (0x4002a000)
        libdl.so.2 => /lib/libdl.so.2 (0x4006b000)
        libc.so.6 => /lib/libc.so.6 (0x4006f000)
        /lib/ld-linux.so.2 (0x40000000)
ddevbox:/home#

ddevbox:/# ldd bin/bash
        libncurses.so.5 => /lib/libncurses.so.5 (0x4002a000)
        libdl.so.2 => /lib/libdl.so.2 (0x4006b000)
        libc.so.6 => /lib/libc.so.6 (0x4006f000)
        /lib/ld-linux.so.2 (0x40000000)
ddevbox:/# ls -l lib/libncurses.so.5
lrwxrwxrwx 1 root root 17 Oct 13 09:08 lib/libncurses.so.5 -> libncurses.so.5.5
ddevbox:/# ls -l lib/libdl.so.2
lrwxrwxrwx 1 root root 14 Oct 13 09:08 lib/libdl.so.2 -> libdl-2.3.6.so
ddevbox:/# ls -l lib/ld-linux.so.2
lrwxrwxrwx 1 root root 11 Oct 13 09:08 lib/ld-linux.so.2 -> ld-2.3.6.so
ddevbox:/#

And I checked on bash:

Code:

ddevbox:/# ls -l bin/bash /bin/bash
-rwxr-xr-x 1 root root 676384 Jul  5  2006 /bin/bash
-rwxr-xr-x 1 root root 676384 Jul  5  2006 bin/bash
ddevbox:/#

Its there!?!?

I am not, sure where else to look / troubleshoot this issue.

Maybe step 13. Copy everything necessary files except the ~700 Mb KNOPPIX file failed for me???

I need to figure out what I have not setup! Any help would be great.

mikedeatworld · 10-24-2006, 07:33 AM

any ideas? i've google'd this to death...

SO, MARA, to answer your question, I should have all of the files that the tutorial asked me to copy to that directory.

PatrickNew · 10-24-2006, 10:53 PM

Perhaps I'm confused, but you said you created
/mnt/knx/master/KNOPPIX

but then your error output seems to suggest that you tried to chroot into
/mnt/knx/source/KNOPPIX

was this caused by an innocent typo?

timmeke · 10-25-2006, 06:50 AM

Quote:

Originally Posted by mikedeatworld

I have tried to see if my libraries were setup correctly:

Code:

ddevbox:/home# ldd /bin/bash
        libncurses.so.5 => /lib/libncurses.so.5 (0x4002a000)
        libdl.so.2 => /lib/libdl.so.2 (0x4006b000)
        libc.so.6 => /lib/libc.so.6 (0x4006f000)
        /lib/ld-linux.so.2 (0x40000000)
ddevbox:/home#

ddevbox:/# ldd bin/bash
        libncurses.so.5 => /lib/libncurses.so.5 (0x4002a000)
        libdl.so.2 => /lib/libdl.so.2 (0x4006b000)
        libc.so.6 => /lib/libc.so.6 (0x4006f000)
        /lib/ld-linux.so.2 (0x40000000)
ddevbox:/# ls -l lib/libncurses.so.5
lrwxrwxrwx 1 root root 17 Oct 13 09:08 lib/libncurses.so.5 -> libncurses.so.5.5
ddevbox:/# ls -l lib/libdl.so.2
lrwxrwxrwx 1 root root 14 Oct 13 09:08 lib/libdl.so.2 -> libdl-2.3.6.so
ddevbox:/# ls -l lib/ld-linux.so.2
lrwxrwxrwx 1 root root 11 Oct 13 09:08 lib/ld-linux.so.2 -> ld-2.3.6.so
ddevbox:/#

And I checked on bash:

Code:

ddevbox:/# ls -l bin/bash /bin/bash
-rwxr-xr-x 1 root root 676384 Jul  5  2006 /bin/bash
-rwxr-xr-x 1 root root 676384 Jul  5  2006 bin/bash
ddevbox:/#

I haven't read up on the links you posted, but have you checked that your libs and bash are present both "outside" and "inside" the chroot jail?

The code shown above only shows me that:
1. /bin/bash can be located and ldd'ed from your /home directory (=outside of chroot jail).
2. ldd bin/bash also works from the / dir (also outside the jail, since your chroot failed!).
Both ldd thus are performed on /bin/bash (either via absolute path with current dir = /home and via relative path with current dir = /).

To check if you have bash inside your jail, do the following:

Code:

cd /mnt/knx/source/KNOPPIX #you may need to replace "source" with "master", as posted.
#since /mnt/knx/source/KNOPPIX == / inside your chroot jail, you need to have /bin, /etc, etc 
#defined UNDER it. So now do:
ls bin/bash 
#which is equivalent to "ls /mnt/knx/source/KNOPPIX/bin/bash", as long as you haven't chroot'ed
#successfully.
ldd bin/bash