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- From: Ulrich Kuehn <kuehn@goedel.uni-muenster.de>
- Subject: Re: XATTR structure for biosfs entries
- Date: Wed, 10 Nov 1993 13:40:20 +0100
-
- Hi Torsten,
-
- |> > I think the best way to do it would be a new Dcntl on /dev which allows
- |> > the device driver to query the address of its supporting structure in
- |> > the kernel memory...
- |>
- |> Ah, yes, this one doesn't sound bad :-) but just at this moment a more
- |> general problems comes to my mind: If the device driver has full access
- |> to its XATTR field, it can also change its own uid/gid or so. This won't
- |> matter for the built-in ones, but someone _could_ write a driver which
- |> can self-change its uid to superuser... Looks a bit like a security hole :-(
- |>
-
- Well, if you can put your own device driver into the system folder, then
- THAT is a security hole, as a device driver can (in priciple) do anything
- it wants, even change the uid of the current process, and it does not need
- access to its own file uid/gid field. I think this is definitly not a
- security hole.
-
- Regards,
- Ulrich
- --
-
- +---------------+----------------------------+-----------------------+
- | Ulrich Kuehn | Internet: | Life is uncertain -- |
- | Cand.Math.Inf | kuehn@math.uni-muenster.de | eat the dessert first |
- +---------------+----------------------------+-----------------------+
-