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Date:   Thu, 26 Oct 2017 15:45:45 +0200
From:   Paolo Bonzini <>
Cc:     Christoffer Dall <>,
        Marc Zyngier <>,
        Christian Borntraeger <>,
        Cornelia Huck <>,
        James Hogan <>,
        Paul Mackerras <>,,
        Kees Cook <>,
        Radim Krčmář <>
Subject: [PATCH v2 0/2] KVM: fixes for the kernel-hardening tree

Four KVM ioctls (KVM_GET/SET_CPUID2 on x86, KVM_GET/SET_ONE_REG on
ARM and s390) directly access the kvm_vcpu_arch struct.  Therefore, the
new usercopy hardening work in linux-next, which forbids copies from and
to slab objects unless they are from kmalloc or explicitly whitelisted,
breaks KVM on those architectures.

The kvm_vcpu_arch struct is embedded in the kvm_vcpu struct and the
corresponding slab cache is allocated by architecture-independent code.
It is enough, for simplicity, to whitelist the whole sub-struct and
only touch one place of the KVM code.  Later, any further restrictions
can be applied in the KVM tree.

Paolo Bonzini (2):
  kvm: whitelist struct kvm_vcpu_arch
  kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl

 arch/x86/kvm/x86.c  | 7 ++++---
 virt/kvm/kvm_main.c | 8 ++++++--
 2 files changed, 10 insertions(+), 5 deletions(-)


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