Linux namespaces and seccomp-bpf sandbox
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Vincent43 spotify.profile: remove /sys from blacklist
Blacklisting whole /sys is too restrictive, it may break various graphics stacks, see #2080
Latest commit 516f8d0 Aug 14, 2018
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contrib Replace all possible HTTP links with HTTPS Aug 8, 2018
etc-fixes expand seccomp macros in seccomp.drop line - macros not supported in … May 14, 2018
etc spotify.profile: remove /sys from blacklist Aug 14, 2018
platform Replace all possible HTTP links with HTTPS Aug 8, 2018
src Add profile for electrum Aug 13, 2018
test release 0.9.56~rc1 testing Aug 11, 2018
.gitignore .gitignore update Apr 16, 2018
.travis.yml Fix travis May 25, 2018 Add more necessary info in new issue template Mar 7, 2018
COPYING Baseline firejail 0.9.28 Aug 8, 2015 evaluate UID_MIN/GID_MID at runtime, remove compile time evaluation - f… Jun 4, 2018
README Merges Aug 12, 2018 Add profile for electrum Aug 13, 2018
RELNOTES Add profile for electrum Aug 13, 2018
configure release 0.9.56~rc1 testing Aug 11, 2018 release 0.9.56~rc1 testing Aug 11, 2018
dummy.c support Spectre mitigation patch for gcc compiler Mar 23, 2018 testing Apr 1, 2018 merged building on systems without bash from manevich Feb 14, 2016 line counter Jul 27, 2018 strip trailing whitespace May 24, 2017 Fix lintian May 25, 2018 workaround for systems where common UNIX utilities are symlinks to bu… Aug 8, 2016 merged building on systems without bash from manevich Feb 14, 2016 mkuid: fall back to default values if no UID_MIN / GID_MIN found Apr 19, 2018
video.png new video demo Feb 19, 2018


Build Status

Firejail is a SUID sandbox program that reduces the risk of security breaches by restricting the running environment of untrusted applications using Linux namespaces, seccomp-bpf and Linux capabilities. It allows a process and all its descendants to have their own private view of the globally shared kernel resources, such as the network stack, process table, mount table. Firejail can work in a SELinux or AppArmor environment, and it is integrated with Linux Control Groups.

Written in C with virtually no dependencies, the software runs on any Linux computer with a 3.x kernel version or newer. It can sandbox any type of processes: servers, graphical applications, and even user login sessions. The software includes sandbox profiles for a number of more common Linux programs, such as Mozilla Firefox, Chromium, VLC, Transmission etc.

The sandbox is lightweight, the overhead is low. There are no complicated configuration files to edit, no socket connections open, no daemons running in the background. All security features are implemented directly in Linux kernel and available on any Linux computer.

Firejail Firefox Demo

Project webpage:

Download and Installation:




Travis-CI status:

Compile and install

$ git clone
$ cd firejail
$ ./configure && make && sudo make install-strip

On Debian/Ubuntu you will need to install git and a compiler:

$ sudo apt-get install git build-essential

Running the sandbox

To start the sandbox, prefix your command with “firejail”:

$ firejail firefox            # starting Mozilla Firefox
$ firejail transmission-gtk   # starting Transmission BitTorrent
$ firejail vlc                # starting VideoLAN Client
$ sudo firejail /etc/init.d/nginx start

Run "firejail --list" in a terminal to list all active sandboxes. Example:

$ firejail --list
1617:netblue:/usr/bin/firejail /usr/bin/firefox-esr
7719:netblue:/usr/bin/firejail /usr/bin/transmission-qt
7779:netblue:/usr/bin/firejail /usr/bin/galculator
7874:netblue:/usr/bin/firejail /usr/bin/vlc --started-from-file file:///home/netblue/firejail-whitelist.mp4
7916:netblue:firejail --list

Desktop integration

Integrate your sandbox into your desktop by running the following two commands:

$ firecfg --fix-sound
$ sudo firecfg

The first command solves some shared memory/PID namespace bugs in PulseAudio software prior to version 9. The second command integrates Firejail into your desktop. You would need to logout and login back to apply PulseAudio changes.

Start your programs the way you are used to: desktop manager menus, file manager, desktop launchers. The integration applies to any program supported by default by Firejail. There are about 250 default applications in current Firejail version, and the number goes up with every new release. We keep the application list in /usr/lib/firejail/firecfg.config file.

Security profiles

Most Firejail command line options can be passed to the sandbox using profile files. You can find the profiles for all supported applications in /etc/firejail directory.

If you keep additional Firejail security profiles in a public repository, please give us a link:

Use this issue to request new profiles: #1139

We also keep a list of profile fixes for previous released versions in etc-fixes directory .

Current development version: 0.9.55

New commands:

      (wireless support for --net)
              Enable a new network namespace and connect it to this  ethernet
              interface  using  the  standard  Linux  macvlan|ipvaln  driver.
              Unless specified  with  option  --ip  and  --defaultgw,  an  IP
              address and a default gateway will be assigned automatically to
              the sandbox. The  IP  address  is  verified  using  ARP  before
              assignment.  The  address  configured as default gateway is the
              default gateway of the host. Up to four --net  options  can  be
              specified.   Support  for ipvlan driver was introduced in Linux
              kernel 3.19.

              $ firejail --net=eth0 --ip= --dns= firefox
              $ firejail --net=wlan0 firefox

       (tunneling support)
              Enable a new network namespace and connect it to this  ethernet
              tap  interface  using the standard Linux macvlan driver. If the
              tap interface is not configured, the sandbox will  not  try  to
              configure  the  interface inside the sandbox.  Please use --ip,
              --netmask and --defaultgw to specify the configuration.

              $ firejail --net=tap0 --ip=  --netmask=
              --defaultgw= firefox

              Use this option when you want to assign an IP address in a  new
              namespace  and  the  parent interface specified by --net is not
              configured. An IP address and  a  default  gateway  address
              also  have  to be added. By default the new namespace interface
              comes without IP address and default gateway configured.  Exam‐

              $ sudo /sbin/brctl addbr br0
              $ sudo /sbin/ifconfig br0 up
              $     firejail     --ip=     --netmask=

              /dev/shm directory is untouched (even with --private-dev)

              $ firejail --keep-dev-shm --private-dev

              Disable U2F devices.

              $ firejail --nou2f

               Mount an empty temporary filesystem on top of the .cache
               directory in user home. All modifications are discarded
               when the sandbox is closed.

              $ firejail --private-cache

New profiles

Microsoft Office Online, riot-desktop, gnome-mpv, snox, gradio, standardnotes-desktop, shellcheck, patch, flameshot, rview, rvim, vimcat, vimdiff, vimpager, vimtutor, xxd, Beaker, electrum