Messages in this thread | | | Date | Thu, 20 Dec 2007 21:55:55 +0100 (CET) | From | Bodo Eggert <> | Subject | Re: RFC: permit link(2) to work across --bind mounts ? |
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On Wed, 19 Dec 2007, 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?
What about reading POSIX which says
1264 [EXDEV] 1265 Improper link. A link to a file on another file system was attempted.
So if the link creates a file on NOT another filesystem (which is the point of bind mounts), it should NOT return EXDEV.
Having an artificial boundary between different views to a fs may happen to be a security feature if used with care, but most users do expect the opposite and wonder why mv is needlessly slow. I'm not even sure if defaulting to having a barrier is sane at all, but if people confuse filesystems and mountpoints^W^W^W^Wuse this feature, they will depend on this feature not changing:-)
-- "It is generally inadvisable to eject directly over the area you just bombed." -U.S. Air Force Manual
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