Re: [PATCH 1/3] KVM: x86: work around infinite loop in microcode when #AC is delivered

From: Venkatesh Srinivas
Date: Tue Nov 10 2015 - 19:39:47 EST

On Tue, Nov 10, 2015 at 01:22:52PM +0100, Paolo Bonzini wrote:
> From: Eric Northup <digitaleric@xxxxxxxxxx>
> It was found that a guest can DoS a host by triggering an infinite
> stream of "alignment check" (#AC) exceptions. This causes the
> microcode to enter an infinite loop where the core never receives
> another interrupt. The host kernel panics pretty quickly due to the
> effects (CVE-2015-5307).
> Signed-off-by: Eric Northup <digitaleric@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>

Tested-by: Venkatesh Srinivas <venkateshs@xxxxxxxxxx>

-- vs;
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