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Date: Fri, 22 Feb 2019 11:09:22 +1100
From: Russell Currey <ruscur@...sell.cc>
To: Kees Cook <keescook@...omium.org>
Cc: PowerPC <linuxppc-dev@...ts.ozlabs.org>, Michael Ellerman
<mpe@...erman.id.au>, Nick Piggin <npiggin@...il.com>, Christophe Leroy
<christophe.leroy@....fr>, Kernel Hardening
<kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 0/7] Kernel Userspace Protection for radix
On Thu, 2019-02-21 at 08:07 -0800, Kees Cook wrote:
> On Thu, Feb 21, 2019 at 1:36 AM Russell Currey <ruscur@...sell.cc>
> wrote:
> > The first three patches of these series are from Christophe's work
> > and are
> > the bare minimum framework needed to implement the support for
> > radix.
> >
> > In patch 3, I have removed from Christophe's patch my
> > implementation of
> > the 64-bit exception handling code, since we don't have an answer
> > for
> > making nested exceptions work yet. This is mentioned in the final
> > KUAP
> > patch. Regardless, this is still a significant security
> > improvement
> > and greatly narrows the attack surface.
>
> Nice! Am I understanding correctly that with this series powerpc9 and
> later, using radix, will pass the lkdtm tests for KUAP and KUEP (i.e.
> EXEC_USERSPACE and ACCESS_USERSPACE)?
Yes! We've had execution prevention for a while on radix (which is
default on POWER9) since 3b10d0095a1e, the only functional thing this
series does is allow disabling it with nosmep. This series adds access
prevention.
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