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

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Message-ID: <20151111003939.GA31855@google.com>
Date:	Tue, 10 Nov 2015 16:39:39 -0800
From:	Venkatesh Srinivas <venkateshs@...gle.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	digitaleric@...gle.com, stable@...r.kernel.org
Subject: Re: [PATCH 1/3] KVM: x86: work around infinite loop in microcode
 when #AC is delivered

On Tue, Nov 10, 2015 at 01:22:52PM +0100, Paolo Bonzini wrote:
> From: Eric Northup <digitaleric@...gle.com>
> 
> 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@...gle.com>
> Cc: stable@...r.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Tested-by: Venkatesh Srinivas <venkateshs@...gle.com>

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