Re: FUSE merging?

[Miklos Szeredi]

> > 
> > 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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