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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