KVM: x86: Protect exit_reason from being used in Spectre-v1/L1TF attacks

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This fixes a Spectre-v1/L1TF vulnerability in vmx_handle_exit().
While exit_reason is set by the hardware and therefore should not be
attacker-influenced, an unknown exit_reason could potentially be used to
perform such an attack.

Fixes: 55d2375e58 ("KVM: nVMX: Move nested code to dedicated files")

Signed-off-by: Marios Pomonis <pomonis@google.com>
Signed-off-by: Nick Finco <nifi@google.com>
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Andrew Honig <ahonig@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Marios Pomonis 2019-12-11 12:47:51 -08:00 • committed by Paolo Bonzini

parent 125ffc5e0a

commit c926f2f723

1 changed files with 32 additions and 25 deletions

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arch/x86/kvm/vmx/vmx.c

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