Hello,
I have a problem to use chroot:
I did:
sudo -s
mkdir /f
mkdir /f/bin /f/lib
cp /bin/bash /f/bin

ldd /bin/bash
libncurses.so.5 => /lib/libncurses.so.5 (0x00002b2d9014f000)
libdl.so.2 => /lib/libdl.so.2 (0x00002b2d9039b000)
libc.so.6 => /lib/libc.so.6 (0x00002b2d9059f000)
/lib64/ld-linux-x86-64.so.2 (0x00002b2d8ff31000)

cp /lib/libncurses.so.5 /lib/libdl.so.2 /lib/libc.so.6 /lib/ld-2.6.1.so /f/lib

chroot /f or chroot /f /bin/bash gives:
chroot: cannot run command `/bin/bash': No such file or directory

What is wrong in my approach ?

tia
--
Gérard

What does 'find /f' produce?

--
Neil Watson | Debian Linux
System Administrator | Uptime 2 days
http://watson-wilson.ca


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On Mon, Aug 20, 2007 at 02:01:07PM -0400, Neil Watson wrote:
>From: Neil Watson <debian@watson-wilson.ca>
>To: debian-user@lists.debian.org
>Subject: Re: chroot: cannot run command `/bin/bash': No such file or directory
>X-Spam-Checker-Version: SpamAssassin 3.1.4 (2006-07-26) on murphy.debian.org
>X-Spam-Level:
>X-Spam-Status: No, score=-3.1 required=4.0 tests=AWL,FORGED_RCVD_HELO,
> LDOSUBSCRIBER,SPF_PASS autolearn=ham version=3.1.4
>
> What does 'find /f' produce?
find /f:

/f
/f/bin
/f/bin/bash
/f/lib
/f/lib/libncurses.so.5
/f/lib/ld-2.6.1.so
/f/lib/libdl.so.2
/f/lib/libc.so.6

--
Gérard

On Mon, Aug 20, 2007 at 08:12:24PM +0200, Gerard Robin wrote:
> find /f:
>
>/f
>/f/bin
>/f/bin/bash
>/f/lib
>/f/lib/libncurses.so.5
>/f/lib/ld-2.6.1.so
>/f/lib/libdl.so.2
>/f/lib/libc.so.6

First post:
>ldd /bin/bash
> libncurses.so.5 => /lib/libncurses.so.5 (0x00002b2d9014f000)
> libdl.so.2 => /lib/libdl.so.2 (0x00002b2d9039b000)
> libc.so.6 => /lib/libc.so.6 (0x00002b2d9059f000)
> /lib64/ld-linux-x86-64.so.2 (0x00002b2d8ff31000)

I don't see the last entry in the results of the find command.

--
Neil Watson | Debian Linux
System Administrator | Uptime 2 days
http://watson-wilson.ca


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On Mon, Aug 20, 2007 at 08:40:09PM +0200, Gerard Robin wrote:
>>First post:
>>>ldd /bin/bash
>>> libncurses.so.5 => /lib/libncurses.so.5 (0x00002b2d9014f000)
>>> libdl.so.2 => /lib/libdl.so.2 (0x00002b2d9039b000)
>>> libc.so.6 => /lib/libc.so.6 (0x00002b2d9059f000)
>>> /lib64/ld-linux-x86-64.so.2 (0x00002b2d8ff31000)
>>
>>I don't see the last entry in the results of the find command.
>yes but it's a symbolic link to ld-2.6.1.so:
>
>ls -la /lib64/ld-linux-x86-64.so.2 :
>lrwxrwxrwx 1 root root 11 2007-08-07 23:08 /lib64/ld-linux-x86-64.so.2 ->
>ld-2.6.1.so*

I doubt the process would know that. It may look for the link name and
fail if it is not found. Create the link in your jail and try again.

--
Neil Watson | Debian Linux
System Administrator | Uptime 2 days
http://watson-wilson.ca


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On Mon, Aug 20, 2007 at 02:24:18PM -0400, Neil Watson wrote:
>From: Neil Watson <debian@watson-wilson.ca>
>To: debian-user@lists.debian.org
>Subject: Re: chroot: cannot run command `/bin/bash': No such file or directory
>X-Spam-Checker-Version: SpamAssassin 3.1.4 (2006-07-26) on murphy.debian.org
>X-Spam-Level:
>X-Spam-Status: No, score=-4.3 required=4.0 tests=AWL,BAYES_00,
> FORGED_RCVD_HELO,IMPRONONCABLE_2,LDOSUBSCRIBER,SPF _PASS autolearn=no
> version=3.1.4
>
> On Mon, Aug 20, 2007 at 08:12:24PM +0200, Gerard Robin wrote:
>> find /f:
>>
>> /f
>> /f/bin
>> /f/bin/bash
>> /f/lib
>> /f/lib/libncurses.so.5
>> /f/lib/ld-2.6.1.so
>> /f/lib/libdl.so.2
>> /f/lib/libc.so.6
>
> First post:
>> ldd /bin/bash
>> libncurses.so.5 => /lib/libncurses.so.5 (0x00002b2d9014f000)
>> libdl.so.2 => /lib/libdl.so.2 (0x00002b2d9039b000)
>> libc.so.6 => /lib/libc.so.6 (0x00002b2d9059f000)
>> /lib64/ld-linux-x86-64.so.2 (0x00002b2d8ff31000)
>
> I don't see the last entry in the results of the find command.
yes but it's a symbolic link to ld-2.6.1.so:

ls -la /lib64/ld-linux-x86-64.so.2 :
lrwxrwxrwx 1 root root 11 2007-08-07 23:08 /lib64/ld-linux-x86-64.so.2 -> ld-2.6.1.so*


--
Gérard

On Mon, Aug 20, 2007 at 02:44:31PM -0400, Neil Watson wrote:
>From: Neil Watson <debian@watson-wilson.ca>
>To: debian-user@lists.debian.org
>Subject: Re: chroot: cannot run command `/bin/bash': No such file or directory
>X-Spam-Checker-Version: SpamAssassin 3.1.4 (2006-07-26) on murphy.debian.org
>X-Spam-Level:
>X-Spam-Status: No, score=-3.9 required=4.0 tests=AWL,BAYES_00,
> FORGED_RCVD_HELO,IMPRONONCABLE_1,IMPRONONCABLE_2,L DOSUBSCRIBER,
> MURPHY_WRONG_WORD1,MURPHY_WRONG_WORD2,SPF_PASS autolearn=no
> version=3.1.4
>
> On Mon, Aug 20, 2007 at 08:40:09PM +0200, Gerard Robin wrote:
>>> First post:
>>>> ldd /bin/bash
>>>> libncurses.so.5 => /lib/libncurses.so.5 (0x00002b2d9014f000)
>>>> libdl.so.2 => /lib/libdl.so.2 (0x00002b2d9039b000)
>>>> libc.so.6 => /lib/libc.so.6 (0x00002b2d9059f000)
>>>> /lib64/ld-linux-x86-64.so.2 (0x00002b2d8ff31000)
>>>
>>> I don't see the last entry in the results of the find command.
>> yes but it's a symbolic link to ld-2.6.1.so:
>>
>> ls -la /lib64/ld-linux-x86-64.so.2 :
>> lrwxrwxrwx 1 root root 11 2007-08-07 23:08 /lib64/ld-linux-x86-64.so.2 ->
>> ld-2.6.1.so*
>
> I doubt the process would know that. It may look for the link name and
> fail if it is not found. Create the link in your jail and try again.

ok, now I have:
ls -l /f:
drwxr-xr-x 2 root root 72 2007-08-20 20:10 bin/
drwxr-xr-x 2 root root 216 2007-08-20 22:07 lib/
lrwxrwxrwx 1 root root 6 2007-08-20 22:00 lib64 -> /f/lib/

ls -l /f/lib:
-rwxr-xr-x 1 root root 121K 2007-08-20 15:50 ld-2.6.1.so*
lrwxrwxrwx 1 root root 11 2007-08-20 22:07 ld-linux-x86-64.so.2 -> ld-2.6.1.so*
-rwxr-xr-x 1 root root 1,4M 2007-08-20 15:50 libc.so.6*
-rw-r--r-- 1 root root 15K 2007-08-20 15:50 libdl.so.2
-rw-r--r-- 1 root root 304K 2007-08-20 15:50 libncurses.so.5

and always:

chroot /f:
chroot: cannot run command `/bin/bash': No such file or directory

--
Gérard

On Mon, Aug 20, 2007 at 10:33:20PM +0200, Gerard Robin wrote:
> On Mon, Aug 20, 2007 at 02:44:31PM -0400, Neil Watson wrote:
>> On Mon, Aug 20, 2007 at 08:40:09PM +0200, Gerard Robin wrote:
>>>> First post:
>>>>> ldd /bin/bash
>>>>> libncurses.so.5 => /lib/libncurses.so.5 (0x00002b2d9014f000)
>>>>> libdl.so.2 => /lib/libdl.so.2 (0x00002b2d9039b000)
>>>>> libc.so.6 => /lib/libc.so.6 (0x00002b2d9059f000)
>>>>> /lib64/ld-linux-x86-64.so.2 (0x00002b2d8ff31000)
>>>>
>>>> I don't see the last entry in the results of the find command.
>>> yes but it's a symbolic link to ld-2.6.1.so:
>>>
>>> ls -la /lib64/ld-linux-x86-64.so.2 :
>>> lrwxrwxrwx 1 root root 11 2007-08-07 23:08 /lib64/ld-linux-x86-64.so.2 ->
>>> ld-2.6.1.so*
>>
>> I doubt the process would know that. It may look for the link name and
>> fail if it is not found. Create the link in your jail and try again.
>
> ok, now I have:
> ls -l /f:
> drwxr-xr-x 2 root root 72 2007-08-20 20:10 bin/
> drwxr-xr-x 2 root root 216 2007-08-20 22:07 lib/
> lrwxrwxrwx 1 root root 6 2007-08-20 22:00 lib64 -> /f/lib/

Seems to me that symlink target ought to be lib/ or /lib/, since /f/lib/
won't be visible when you chroot to /f/.

Ken

> ls -l /f/lib:
> -rwxr-xr-x 1 root root 121K 2007-08-20 15:50 ld-2.6.1.so*
> lrwxrwxrwx 1 root root 11 2007-08-20 22:07 ld-linux-x86-64.so.2 ->
> ld-2.6.1.so*
> -rwxr-xr-x 1 root root 1,4M 2007-08-20 15:50 libc.so.6*
> -rw-r--r-- 1 root root 15K 2007-08-20 15:50 libdl.so.2
> -rw-r--r-- 1 root root 304K 2007-08-20 15:50 libncurses.so.5
>
> and always:
>
> chroot /f:
> chroot: cannot run command `/bin/bash': No such file or directory

--
Ken Irving, fnkci+debianuser@uaf.edu


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On Mon, Aug 20, 2007 at 02:19:49PM -0800, Ken Irving wrote:
>From: Ken Irving <fnkci@uaf.edu>
>To: debian-user@lists.debian.org
>Subject: Re: chroot: cannot run command `/bin/bash': No such file or
> directory
>Mail-Followup-To: debian-user@lists.debian.org
>X-Spam-Checker-Version: SpamAssassin 3.1.4 (2006-07-26) on murphy.debian.org
>X-Spam-Level:
>X-Spam-Status: No, score=-5.0 required=4.0 tests=AWL,BAYES_00,IMPRONONCABLE_1,
> IMPRONONCABLE_2,LDOSUBSCRIBER,MURPHY_WRONG_WORD1,M URPHY_WRONG_WORD2
> autolearn=no version=3.1.4
>
>On Mon, Aug 20, 2007 at 10:33:20PM +0200, Gerard Robin wrote:
>> On Mon, Aug 20, 2007 at 02:44:31PM -0400, Neil Watson wrote:
>>> On Mon, Aug 20, 2007 at 08:40:09PM +0200, Gerard Robin wrote:
>>>>> First post:
>>>>>> ldd /bin/bash
>>>>>> libncurses.so.5 => /lib/libncurses.so.5 (0x00002b2d9014f000)
>>>>>> libdl.so.2 => /lib/libdl.so.2 (0x00002b2d9039b000)
>>>>>> libc.so.6 => /lib/libc.so.6 (0x00002b2d9059f000)
>>>>>> /lib64/ld-linux-x86-64.so.2 (0x00002b2d8ff31000)
>>>>>
>>>>> I don't see the last entry in the results of the find command.
>>>> yes but it's a symbolic link to ld-2.6.1.so:
>>>>
>>>> ls -la /lib64/ld-linux-x86-64.so.2 :
>>>> lrwxrwxrwx 1 root root 11 2007-08-07 23:08 /lib64/ld-linux-x86-64.so.2->
>>>> ld-2.6.1.so*
>>>
>>> I doubt the process would know that. It may look for the link name and
>>> fail if it is not found. Create the link in your jail and try again.
>>
>> ok, now I have:
>> ls -l /f:
>> drwxr-xr-x 2 root root 72 2007-08-20 20:10 bin/
>> drwxr-xr-x 2 root root 216 2007-08-20 22:07 lib/
>> lrwxrwxrwx 1 root root 6 2007-08-20 22:00 lib64 -> /f/lib/
>
>Seems to me that symlink target ought to be lib/ or /lib/, since /f/lib/
>won't be visible when you chroot to /f/.
>
>Ken

ok it's fine now, I am an idiot ;-)
Many thanks to you and to Neil.

--
Gérard