Re: port-xen/45830 (reading :dev/mem panics an i386 domU)

To: port-xen-maintainer%netbsd.org@localhost,netbsd-bugs%netbsd.org@localhost,gnats-admin%netbsd.org@localhost,bouyer%NetBSD.org@localhost,manu%netbsd.org@localhost
Subject: Re: port-xen/45830 (reading :dev/mem panics an i386 domU)
From: bouyer%NetBSD.org@localhost
Date: Wed, 18 Jan 2012 21:28:03 +0000 (UTC)

Synopsis: reading :dev/mem panics an i386 domU

State-Changed-From-To: open->analyzed
State-Changed-By: bouyer%NetBSD.org@localhost
State-Changed-When: Wed, 18 Jan 2012 21:28:02 +0000
State-Changed-Why:
The problem is in mm_md_physacc(), which checks if the requested PA is in
memory range, and then relies on 
kauth_authorize_machdep(KAUTH_MACHDEP_UNMANAGEDMEM)
which always allows access for root.
I guess that, at last for Xen, there should be extra checks here.

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