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SubjectRe: Low Latency Patch
Date
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Robert Dinse <nanook@eskimo.com> said:
> On 2 Jul 2000, Yoann Vandoorselaere wrote:
> > Non executable stack doesn't help preventing stack overflow,
> > that was said thousand of time.

> It's said erroneously, because you go from a problem of having to guess
> within a page to having to be exact.

So what? Just find out what distribution somebody is running, and check
with that. Sure, it's a bit harder to do, but if you get it right for
current Red Hat, Debian, and SuSE, you've got almost all.


[...]

> The patch also provides restrictions on links in a +t directory, it
> also prevents users from making hard links to files they don't own. This
> breaks a number of race exploits, like the old passwd race, amoung other
> things.
>
> There are some restrictions on writes to FIFO's in +t directories
> unless the FIFO is owned by the user or the FIFO is opened without the
> O_CREAT flag.

All this breaks POSIX (and many legitimate uses) big time.

> There is the ability to restrict access to proc, for applications where
> you do not want one user from watching another, ps only shows a users own
> processes, etc.

That sounds reasonable.
--
Horst von Brand vonbrand@sleipnir.valparaiso.cl
Casilla 9G, Vin~a del Mar, Chile +56 32 672616

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