kvm: vmx: Scrub hardware GPRs at VM-exit

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Guest GPR values are live in the hardware GPRs at VM-exit.  Do not
leave any guest values in hardware GPRs after the guest GPR values are
saved to the vcpu_vmx structure.

This is a partial mitigation for CVE 2017-5715 and CVE 2017-5753.
Specifically, it defeats the Project Zero PoC for CVE 2017-5715.

Suggested-by: Eric Northup <digitaleric@google.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Eric Northup <digitaleric@google.com>
Reviewed-by: Benjamin Serebrin <serebrin@google.com>
Reviewed-by: Andrew Honig <ahonig@google.com>
[Paolo: Add AMD bits, Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

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Jim Mattson 2018-01-03 14:31:38 -08:00 • committed by Paolo Bonzini

parent aa12f594f9

commit 0cb5b30698

2 changed files with 32 additions and 1 deletions

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19

arch/x86/kvm/svm.c

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14

arch/x86/kvm/vmx.c

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