Security issues with abstract namespace sockets

[Matt McCutchen]

On Wed, 2011-01-05 at 15:25 -0500, Adam Jackson wrote:
> On Wed, 2011-01-05 at 13:38 -0500, Matt McCutchen wrote:
> > The
> > more significant DoS condition is another user taking the name you want,
> > which can happen in the abstract namespace but not in a directory only
> > you can write.
> 
> I don't have any of those.  If the X server is running as root (like in
> the gdm case) then I can put the socket wherever I want.  If it's Xvfb,
> then where do I put this directory?  $HOME ?  Nope, might not be
> there.  /tmp/$USER ?  Won't work if someone else mkdir'd /tmp/ajax
> before I did.

What about the XDG_RUNTIME_DIR (/var/run/user/$USER) from systemd?

-- 
Matt