netdev - Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root

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Message-ID: <20120810192628.79a34d28@pyramind.ukuu.org.uk>
Date:	Fri, 10 Aug 2012 19:26:28 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	Trond.Myklebust@...app.com, davem@...emloft.net,
	linux-nfs@...r.kernel.org, eric.dumazet@...il.com,
	xemul@...allels.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, bfields@...ldses.org,
	viro@...iv.linux.org.uk, tim.c.chen@...ux.intel.com,
	devel@...nvz.org
Subject: Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified
 root

> On that whole subject...
> 
> Do we need a Unix domain socket equivalent to openat()?

I don't think so. The name is just a file system indexing trick, it's not
really the socket proper. It's little more than "ascii string with
permissions attached" - indeed we also support an abstract name space
which for a lot of uses is actually more convenient.

AF_UNIX between roots raises some interesting semantic questions when you
begin passing file descriptors down them as well.

Alan
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