fstat triggered INVARIANTS panic in memrw()

[Poul-Henning Kamp]

In message <200501280254.j0S2sMJH050277 at blue.mwk.domain>, "Mark W. Krentel" writes:
>I've looked a little deeper into Kris's fstat panic.
>Turns out there are bugs in three places.
>
>(1) fstat(1) sometimes calls kvm_read() with a ridiculously out-of-
>bounds value for nbytes.

The only real problem here is that fstat(1) uses kvm in the first place.
The necessary information should be exported via sysctls.

No program used as part of regular system operation should use kvm.

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