Messages in this thread |  | | | From | (Alan Cox) | | Subject | Re: foreign fs security features (was Re: NCPFS overhaul) | | Date | Mon, 6 Apr 1998 00:40:20 +0100 (BST) |
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> 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 :)
[the discovery by creation problem]
A directory fred exists you cannot see
You do
mkdir fred
do you
a) return -EEXIST revealing the invisible space b) create another fred
if b) what does a user with rights to see both now have to watch.
Alan
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