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Re: some questions
On Sat, Jan 07, 2006 at 11:54:55AM +0100, Manuel Bouyer wrote:
> On Sat, Jan 07, 2006 at 08:59:38AM +0100, Pavel Cahyna wrote:
> > On Sat, Jan 07, 2006 at 05:44:50AM +0100, Manuel Bouyer wrote:
> > > On Sat, Jan 07, 2006 at 01:14:49AM +0100, Pavel Cahyna wrote:
> > > > Why?
> > > >
> > > > if you have root in a domU, you don't need a kernel bug to use DMA,
> > > > which
> > > > opens the door to dom0.
> > >
> > > How do you get access to the DMA register if you don't take control over
> > > the kernel ?
> > i386_iopl ?
> i386_iopl(l, args, retval)
> if (securelevel > 1)
Securelevel > 1? That test should be securelevel >= 1. It's a serious
bug if it's not.
Thor Lancelot Simon
"We cannot usually in social life pursue a single value or a single moral
aim, untroubled by the need to compromise with others." - H.L.A. Hart
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