Re: user flags in public temp space (was Re: chflags() [heads up

[Adam.Morris () ONYX NET (Adam Morris)]

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On 06-Aug-99 Darren Reed wrote:
> If you're designing a software package, want to use temporary files and
> directories but you need the names to be the same every time, where do
> you put them ?  Are you required to use open(O_CREAT|O_EXCL) for files
> in /tmp ?  Apart from the ability to exchange files between users with
> /tmp, having private /tmp's for each uid using the system (with a non-
> world writeable /tmp) has a lot of merit which I hope someone will someday
> properly explore - i.e. there exist programming languages in which the
> buffer overflow is a non-event, now we need an operating system design
> where the /tmp file race-condition is a non-event.

We already have something like that...

The CMW machines (Compartmentalised Mode Workstation) has the concept of "multi
level directories"  These include such things as /tmp.  When you are operating
at level "Top Secret" you have what appears to be a different /tmp from when
you are operating at level "unclassified".  As far as I can tell, it does
actually keep the files in different directories.  I haven't really poked
around at the raw disk level on one of these beasts though (which requires
special privileges) so I can't guarantee it.  You can definitely have two
different files in different level /tmp directories with the same name.

Adam.

- ----------------------------------
If this message isn't signed, it probably isn't me.
Adam Morris - Systems Engineer - Onyx Internet

There's no real need to do housework -- after four years it doesn't get
any worse.

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