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List:       freedesktop-xorg
Subject:    Re: How do chrooted X clients connect to server?
From:       Alan Coopersmith <alan.coopersmith () oracle ! com>
Date:       2014-05-08 15:17:23
Message-ID: 536BA003.3060000 () oracle ! com
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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.coopersmith@oracle.com
	 Oracle Solaris Engineering - http://blogs.oracle.com/alanc
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