firejail and gamemoderun

[rusty-snake]

GameMode has a small shell-script gamemoderun in order to make games without GameMode support supporting GameMode. It works by LD_PRELOADing libgamemodeauto.so.0 which of course does not work with firejail. You need to run gamemoderun inside the sandbox or --env=LD_PRELOAD=libgamemodeauto.so.0 to make GameMode work with firejail. In both cases you need to make a few adoptions to the profile.

Using supertuxkart as example, we want to run

firejail --profile=supertuxkart gamemoderun /usr/bin/supertxkart

• We can not put gamemoderun before firejail (as already said).
• We need to specify the profile because firejail can't detect it if we start gamemoderun.
• We must give the absolute path to the game to skip the firecfg symlink.

In order to run the command above, you need to add the following to your supertuxkart.local:

# Required by gamemoderun
noblacklist ${PATH}/bash
private-bin gamemoderun,bash,env
ignore dbus-user none
dbus-user filter
dbus-user.talk com.feralinteractive.GameMode

• noblacklist ${PATH}/bash because of include disable-shell.inc.
• private-bin gamemoderun,bash,env because supertuxkart.profile has private-bin enabled.
• talk access to com.feralinteractive.GameMode is always required, even for a manual LD_PRELOAD.