A chroot on Unix operating systems is an operation that changes the apparent root directory for the current running process and its children. A program that is run in such a modified environment cannot name (and therefore normally not access) files outside the designated directory tree.

learn more… | top users | synonyms

5
votes
2answers
502 views

How to prevent schroot from overridding passwd file and others files already present on the chrooted system?

When I had to repair my Debian system, I tried to use schroot due the convenience of not having to mount bind several partitions. But, contrary to my expectations, schroot decided to override my ...
3
votes
1answer
927 views

Error message: unknown user 'geoclue' in statoverride file

I obtained a strange error message inside a chroot: unknown user 'geoclue' in statoverride file when running apt-get install or apt-get upgrade. I use schroot to enter this chroot. I found that I ...
2
votes
1answer
346 views

Define custom login shell in schroot

According to the schroot man page: schroot allows the user to run a command or a login shell in a chroot environment. If no command is specified, a login shell will be started in the user's ...
1
vote
1answer
175 views

Can't losetup anything on armhf NAS

I'm pretty new to linux and chrooted my NAS with armhf architecture and tried looping device: losetup -f losetup: Could not find any loop device. Maybe this kernel does not know about the loop ...
1
vote
1answer
2k views

Using bash environment from an external OS partition

I have an external partition, /dev/sda, which contains an Ubuntu OS. The root is located in /dev/sda2. I would like to access commands from this OS partition. I have tried doing the following steps:...
6
votes
1answer
636 views

Real chroot on a systemd machine

I'm trying to get used to systemd, because it seems to be the way that Debian is going. I want to run Xorg in a chroot on hardware, rather than using networking (which seems to be the canonical way ...
4
votes
1answer
213 views

Automate chroot into broken system

Every time you have to mount a system with a live-boot-CD and chroot into the system to repair grub, you have to type so many lines to mount into the right partition: fdisk -l find the right ...
2
votes
0answers
419 views

How to use chroot'd desktop environment on Android with external display, mouse and keyboard?

I have a chroot'd Arch Linux environment set up on my Android phone (a OnePlus One) and I would like to connect it to a monitor (directly or with use of some sort of passthrough/adapter eg. Raspberry ...
1
vote
1answer
372 views

chroot for sftp user

I followed multiple guides on the internet on how to restrict a user so that he cannot change/see files outside of his home directory. So I created a user, let's call him john and I also created a ...
1
vote
1answer
4k views

How can I chroot into a live filesystem.squashfs Linux distribution?

I would like to chroot into a Live USB Linux distro, if such thing is possible. I don't know if there is a generic method, so I will detail my specific test. I am testing Kali Linux v1.0.5 Live USB ...
1
vote
1answer
75 views

Deterministic method to find out whether some other process is in a chroot jail and where?

NOTE: I'm familiar with this U&L Q&A titled: How do I tell I'm running in a chroot? that sounds similar to what I'm asking, but there's a subtle difference to what I'm looking for. That ...
5
votes
2answers
3k views

How to use/test pivot_root?

I want to test the pivot_root command which moves the root file system of the current process to the directory put_old and makes new_root the new root file system. But I always get the following ...
0
votes
1answer
242 views

How can I convert a chroot into a GRUB2 bootable ISO image?

Say I have a chroot containing what will be a working Linux system, and some additional init scripts to mount an overlay filesystem (e.g. AUFS) over it. I've also generated a GRUB2 boot menu. What ...
3
votes
1answer
621 views

chroot into a sshfs folder

I am trying to chroot into a sshfs-mounted directory: mkdir remoteroot sshfs remote:/ remoteroot/ sudo chroot remoteroot/ but I get chroot: cannot change root directory to remoteroot/: Permission ...
0
votes
0answers
70 views

Are system calls available in a chroot environment?

I'm experiencing a lot of compilation errors regarding missing system calls (e.g. error: '__NR_name_to_handle_at' undeclared (first use in this function)) with different projects (ganesha 2.1.0 (https:...
4
votes
2answers
528 views

Could you explain this “chroot” /tmp directory creation?

In the following linked article they explain how to create a "chroot" /tmp directory. I'm a bit confused by what they did. Could someone explain what the following commands are doing? Noexec and /tmp ...
1
vote
1answer
323 views

Limit access on external drive mounted and used by sftp

I've got a unix user "popolo" who is chrooted in /srv/ftp/ and I mount my two external drives by /etc/fstab in /srv/ftp so I have /srv/stp/dude and /srv/ftp/sweet. Popolo has access to those drives ...
2
votes
1answer
437 views

How does chroot's use of qemu for cross compile environments work?

To be able to do cross compiling there's a trick where you copy a static qemu binary into your <different-arch-root-to-be>/usr/bin and when you chroot into that filesystem, which has non-native ...
3
votes
2answers
553 views

How can I force chrooted programs to use a virtual ethernet device?

First off, this is not for security reasons, or for use in a production environment. It's because I want to mess around with different configuration management systems on relatively low-spec ...
2
votes
1answer
2k views

Why does chroot get ENOENT on an existing file?

;TL-DR - Answer: because the dynamic linker ld-linux-x86-64.so.2 was missing. I have mounted a squashfs (shouldn't matter) filesystem -ro,loop at /mnt/foo. It contains among other things the ...
2
votes
1answer
11k views

Chroot in to reinstall Grub2 reinstall, mnt/ is empty

I have a common problem: I installed Fedora 18 on my PC that has Windows on it. When I start the PC I don't get asked which system I want to boot, Windows is chosen always. So I found out that I ...
1
vote
1answer
86 views

ARM cross compilation package not found

I'm trying for arm cross compilation on my i386 machine using sysroot and chroot.I want to set environment variables like PKG_CONFIG_PATH to sysroot.Right now my code is not compiling because it is ...
3
votes
1answer
714 views

How to build gcc inside a Debian chroot?

I used debootstrap to set up a minimal Debian system (x86): debootstrap wheezy /var/chroot http://ftp.debian.org/debian/ Then I entered the chroot and installed some packages: apt-get install ...
4
votes
2answers
823 views

chroot jail that can access the filesystem

chroot jails seem to be simply a different world, with no interaction with the actual filesystem. Thus, the entire environment has to be replicated inside the chroot, which would mean making a full ...
4
votes
0answers
201 views

Unable to view mounted directories in a chroot [closed]

Here is a quick description of what I have done: I have a chrooted user (username: clientdev) which I have jailed inside their home directory. This chroot directory is /home/clientdev/ which is ...
3
votes
0answers
606 views

Running (X) Xfce4 in Debian chroot

I was trying to start Xfce4 in a chroot. The problem is that Xfce4 starts, shows default the UI but the USB keyboard and mouse are not working. My chroot script: #!/bin/bash mount --bind /dev /srv/...
2
votes
1answer
609 views

where does Cron look for the default mail binary?

I have setup Cron Jobs to run inside a Chroot Environment, depending on the User/Group; I have noticed that these cron jobs, running inside the chroot environment, fail to send any mail. Log files ...
2
votes
1answer
195 views

How do I limit local user file system access? What is the best method?

I have a Linux installation with a default user and an admin user (and root). On startup, the default user is automatically logged in and a particular application is launched. My intention is to ...
2
votes
2answers
1k views

How to create an environment for libraries and binaries?

I have a tool that cannot be run under my Desktop Linux. So I'd like to make a folder that contains all its requirements, and run it in the folder. Virtual machine or container is not a solution here ...
0
votes
1answer
768 views

Can I use a shell or python script to execute commands in a chroot?

I need: to make a shellscript which can chroot into a linux environment and run a command there. I am using: arch-chroot (on the arch linux livecd)
5
votes
1answer
466 views

Backtrace of “git clone” running inside qemu-user-emulation based arm-chroot

I'm running a wheezy:armhf chroot using qemu user emulation on my jessie:x86_64 system. Somehow, a git clone on a particular private repository will hang inside the chroot, while succeed natively. ...
7
votes
2answers
850 views

replicate and isolating user environments on the fly

I will be using Ubuntu Linux for this project. For training of a particular application at a conference I need: To have each student be able to ssh into the same user account on a server Upon each ...
8
votes
2answers
60k views

chroot: failed to run command ‘/bin/bash’: No such file or directory [duplicate]

When I run the chroot command an error is given: failed to run command ‘/bin/bash’: No such file or directory
3
votes
2answers
5k views

Chroot SFTP users who require access to multiple directories under same parent folder

I have a RHEL 6 server with a /Documents directory, and it has child directories 1 2 3 4 5.... right under the /Documents directory. Is it possible to create an SFTP chroot jail that only gives a ...
1
vote
1answer
37 views

How to correct error where 2 out of 3 users on chrooted network cannot gain write access?

I have an SFTP server running on Debian. The directory is chrooted and is set up with privileges as such: /sftp/+---testagent2----writespace 750 | 755 755 +---testagent3----...
1
vote
1answer
376 views

Different fakechroot behavior on Fedora and Ubuntu

Consider the following directory tree (mychroot): mychroot/ ├── proc │   └── cpuinfo └── usr └── bin └── ls On Fedora 20: $ fakechroot chroot ./mychroot/ /usr/bin/ls proc cpuinfo ...
6
votes
3answers
539 views

Why are web servers traditionally started as superuser?

Thinking about a future web server setup, it struck me that for some reason web servers usually start as root and then drop certain rights (setuid) for the worker processes. In addition there is often ...
2
votes
1answer
1k views

Create ssh user which can only access home directory [duplicate]

I read documentation on the internet on how to create a new user with SSH access. I figured it out and to create a user is quite simple. The next step I want to take is to jail this ssh server to the ...
3
votes
2answers
260 views

Denying “/opt/” access for SFTP Users other than particular dir

This is my first (newbie) post here in unix stackexchange. I want to use my WebServer (Debian) as SFTPServer giving access to particular employees. The dir structure is as follows under root: /...
2
votes
1answer
164 views

Unable to connect after ChrootDirectory within sshd_config

After adding the following to my sshd_config file... Match user myuser ChrootDirectory /var/www/html X11Forwarding no AllowTcpForwarding no ForceCommand internal-sftp I am unable to ...
1
vote
1answer
1k views

Run Java in a chrooted jail

I'm on a CentOS 6.5 machine with Plesk Panel which I used to create a chrooted environment for a user who can access it via ssh. I'm not a big expert but somehow I managed to let him use some basic ...
1
vote
1answer
192 views

Correlation between CHROOT and Crouton - -

I am trying to understand what purpose/function of CHROOT and how using it with Crouton will allow you to use certain Linux distros and libs. Does CHROOT essentially create some kind of a "pseudo-...
1
vote
2answers
87 views

Automated test for install script

I'm writing an install script for an appliance that modifies system config files under /etc (amongst other things). How can I test this script non-destructively? Ideally I would like to run the ...
3
votes
1answer
2k views

How to properly use Gentoo Linux as a supplement to an existing distribution?

While I originally wanted to entirely replace the Linux distribution my NAS uses, I meanwhile came to the conclusion that it would be better to leave the existing system as unmodified as possible and ...
2
votes
1answer
821 views

How to copy a debootstrap (chroot) directory to another computer?

I created an installation of Debian in a subdirectory using debootstrap on computer A. Now I would like to transfer this installation to computer B which has a local connection but no global internet ...
3
votes
3answers
4k views

Allow User To Access Other User's Home Directory

I have a Fedora server. I would create an SFTP user account which is allowed to access other user's home dir. Is it possible? For example user1 -> /home/user1 user2 -> /home/user1 user2 can ...
2
votes
3answers
2k views

HowTo Chroot to BSD

I recently tried FreeBSD [9.2]. I installed it but as i found out it doesn't install any bootloader by default. So now i want to find out HOW it is possible to chroot to the installed BSD via a ...
2
votes
2answers
1k views

Pivot root between two Linux installations

I have two Linux distributions installed (Debian and Ubuntu). Each with its own usr, swap, and whatever. Both are completely independent, each in its partition. According to the man pages, I could ...
2
votes
1answer
914 views

vsftpd does not allow chrooted users write to directory

I installed vsftpd on ubuntu 12.04 and chrooted local users, in order not to let them see the other parts of system. but when a local user wants to login into ftp it gives out this error: 500 OOPS: ...
18
votes
2answers
6k views

What to use to harden Linux box? Apparmor, SELinux, grsecurity, SMACK, chroot?

I am planning to go back to Linux as a Desktop machine. I would like to make it more secure. And try a few hardening techniques, especially since I plan to get my own server. What would be a good, ...