[PATCH 0/2][SRU][C] CVE-2019-3887 - Nested KVM host kernel DoS

[Tyler Hicks]

https://people.canonical.com/~ubuntu-security/cve/?cve=CVE-2019-3887

 A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific
 Rregister(MSR) access with nested(=1) virtualization enabled. In that, L1
 guest could access L0's APIC register values via L2 guest, when 'virtualize
 x2APIC mode' is enabled. A guest could use this flaw to potentially crash the
 host kernel resulting in DoS issue.

Trivial backports. Build logs are clean. Smoke tested by booting an L2 nested
guest.

Tyler

Marc Orr (2):
  KVM: x86: nVMX: close leak of L0's x2APIC MSRs (CVE-2019-3887)
  KVM: x86: nVMX: fix x2APIC VTPR read intercept

 arch/x86/kvm/vmx.c | 74 +++++++++++++++++++++++++++++++++---------------------
 1 file changed, 45 insertions(+), 29 deletions(-)

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2.7.4