On 05/ 8/14 06:55 AM, Pavel Krc wrote:
Hi all,

I've been using chrooted Debian (and other distros) for years, but there's one 
thing that baffled me many times. While many users seek help trying to make 
chrooted X programs work (mostly due to missing DISPLAY=... or xauth problems), 
I cannot find a reason why this works for me when it clearly shouldn't. I'm 
running XOrg outside the chroot, which listens only on a socket 
/tmp/.X11-unix/X0 and no TCP port, as usual. When preparing the chroot, I don't 
bind /tmp to new root - I mount a new tmpfs, so chrooted /tmp is empty 
(checked). Therefore, the X clients should have no way of connecting the 
server, yet they work without any problems. I have studied source codes of Xlib 
and XCB and found only the expected behavior of trying 
/tmp/.X11-unix/X{display} and tcp port 6000 + {display} (which is closed). Any 
ideas how this works or where I should continue my search?

Xorg also listens on abstract-namespace sockets by default on modern
Linux distros.

--
        -Alan Coopersmith-              alan.coopersm...@oracle.com
         Oracle Solaris Engineering - http://blogs.oracle.com/alanc


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