Commit b963a22e authored Nov 19, 2013 by Andy Honig Committed by Paolo Bonzini Dec 12, 2013

KVM: x86: Fix potential divide by 0 in lapic (CVE-2013-6367)



Under guest controllable circumstances apic_get_tmcct will execute a
divide by zero and cause a crash.  If the guest cpuid support
tsc deadline timers and performs the following sequence of requests
the host will crash.
- Set the mode to periodic
- Set the TMICT to 0
- Set the mode bits to 11 (neither periodic, nor one shot, nor tsc deadline)
- Set the TMICT to non-zero.
Then the lapic_timer.period will be 0, but the TMICT will not be.  If the
guest then reads from the TMCCT then the host will perform a divide by 0.

This patch ensures that if the lapic_timer.period is 0, then the division
does not occur.

Reported-by: Andrew Honig <ahonig@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Andrew Honig <ahonig@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 338c7dba

arch/x86/kvm/lapic.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -841,7 +841,8 @@ static u32 apic_get_tmcct(struct kvm_lapic *apic)
		ASSERT(apic != NULL);

		/* if initial count is 0, current count should also be 0 */
		if (kvm_apic_get_reg(apic, APIC_TMICT) == 0)
		if (kvm_apic_get_reg(apic, APIC_TMICT) == 0 \|\|
		apic->lapic_timer.period == 0)
		return 0;

		remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);

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