Messages in this thread | | | From | Paul Rusty Russell <> | Subject | Re: foreign fs security features (was Re: NCPFS overhaul) | Date | Tue, 07 Apr 1998 13:32:56 +0930 |
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In message <m0yLz1Q-000aOcC@the-village.bc.nu> you write: > > The "per-user hidden file" concept is very important. > > The UFS filesystem is going to need it for Digital Unix > > filesystems with multi-level secure directories enabled. > > Novell Netware support needs it. I'd guess most "Trusted *" > > systems have the concept. > > Its actually something thats quite hard to do right because of the > discovery by creation problem. That requires two people have different > files with the same name. Then a third person who can see both comes > along - what do they see. And more interestingly what the hell goes in > the dcache :)
Consider them as separate mounts which happen to have the same mount point. There exists no user who can see both of them. Then perhaps offer access through /proc/<pid>/mounts, or allow root to mount (somewhere else) the same point with a specific uid if that is really desired. (mount -t hidefs -o fixeduid=100 /mnt/tmp-100). Add an automounter to the mix and it could be quite nice.
Rusty. -- .sig lost in the mail.
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