Messages in this thread | ![/](/images/icornerl.gif) | | Date | Sat, 08 Dec 2018 10:32:31 +0000 | From | Marc Zyngier <> | Subject | Re: [PATCH v6 04/13] arm64/kvm: hide ptrauth from guests |
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On Fri, 07 Dec 2018 18:39:22 +0000, Kristina Martsenko <kristina.martsenko@arm.com> wrote: > > From: Mark Rutland <mark.rutland@arm.com> > > In subsequent patches we're going to expose ptrauth to the host kernel > and userspace, but things are a bit trickier for guest kernels. For the > time being, let's hide ptrauth from KVM guests. > > Regardless of how well-behaved the guest kernel is, guest userspace > could attempt to use ptrauth instructions, triggering a trap to EL2, > resulting in noise from kvm_handle_unknown_ec(). So let's write up a > handler for the PAC trap, which silently injects an UNDEF into the > guest, as if the feature were really missing. > > Signed-off-by: Mark Rutland <mark.rutland@arm.com> > Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com> > Reviewed-by: Andrew Jones <drjones@redhat.com> > Reviewed-by: Christoffer Dall <christoffer.dall@arm.com> > Cc: Marc Zyngier <marc.zyngier@arm.com> > Cc: kvmarm@lists.cs.columbia.edu
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
M.
-- Jazz is not dead, it just smell funny.
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