linux-kernel - Re: RFC: permit link(2) to work across --bind mounts ?

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Message-ID: <47694A75.5000705@rtr.ca>
Date:	Wed, 19 Dec 2007 11:44:37 -0500
From:	Mark Lord <lkml@....ca>
To:	Al Viro <viro@....linux.org.uk>
Cc:	Bodo Eggert <7eggert@....de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: RFC: permit link(2)  to work across --bind mounts ?

Al Viro wrote:
> On Wed, Dec 19, 2007 at 02:43:26PM +0100, Bodo Eggert wrote:
> 
>> Since nobody knows about this "security boundary" and everybody knows about
>> the annoying "can't link across bind-mountpoints bug",
> 
> ... how about teaching people to RTFM?  Starting, perhaps, with man 2 link?
..

Mmm.. that's a programmers' man page, not a user/admin page.
Something in mv(1) would be very useful to have.

And perhaps a mount flag to select desired behaviour,
since virtually everyone expects it to "just work" that way,
and it doesn't.

I'll happily generate a patch if we can agree on the correctness
of the sample patch I posted earlier, plus a suitable mount flag name.

Cheers
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