> >
> > Here's a description of a theoretical DoS scenario:
> >
> > http://marc.theaimsgroup.com/?l=linux-fsdevel&m=111522019516694&w=2
>
> So the open() hangs indefinately. but what if blackhat tries to install
> a package from a no longer existing server on /net or via NFS?
>
> A user supplied pathname is not to be trusted by any setuid (or full
> root) program.
If /net won't detect a dead server within a timeout, I think it can be
considered broken.
> Another example: I'm not sure if there are still /dev/tty devices which
> may block indefinately upon open() but:
>
> - I have yet to see a setuid program which always uses O_NONBLOCK
> when opening user supplied pathnames.
> - one cannot stat() and then open() because that gives a race.
Is "being already broken" an excuse for preventing future breakage,
when these are fixed?
Miklos
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