[LightDM] Setting environment variables the correct way for lightdm/XFCE4

[OmegaPhil]

I currently need to set LD_PRELOAD systemwide in order to work around an
aufs kernel memory allocation problem - '/etc/environment' LD_PRELOAD is
obeyed by shells launched outside a GUI, however anything launched
through lightdm doesn't get this. I can add the export to '~/.bashrc',
however I need it also present for any GUI program launched from the X
session.

Fiddling with '/etc/profile.d/' scripts and adding it to lightdm's
init.d script didn't work, looking through lightdm's source (e.g.
seat.c) suggests it gets stripped unless LIGHTDM_TEST_ROOT is set,
however setting this in '/etc/environment' or in the init.d script still
doesn't cause LD_PRELOAD to be honoured.

The only thing that 'works' is adding the exports to
'/etc/xdg/xfce4/xinitrc', just above the '# run xfce4-session if
installed' block.

Is there a recommended way (other than this) for a sysadmin to set
LD_PRELOAD that is respected by lightdm/XFCE4/etc?

Thanks for any help

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