From: Andy Honig Date: Tue, 19 Nov 2013 22:12:18 +0000 (-0800) Subject: KVM: x86: Fix potential divide by 0 in lapic (CVE-2013-6367) X-Git-Tag: v2.6.32.62~9 X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=e3123670efb2e10e536fa7fe752d72a4ca5bce9a;p=unionfs-2.6.39.y.git KVM: x86: Fix potential divide by 0 in lapic (CVE-2013-6367) commit b963a22e6d1a266a67e9eecc88134713fd54775c upstream 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 Cc: stable@vger.kernel.org Signed-off-by: Andrew Honig Signed-off-by: Paolo Bonzini [dannf: backported to Debian's 2.6.32] Signed-off-by: Willy Tarreau --- diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 8dfeaaa7079..b77857fe037 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -519,7 +519,8 @@ static u32 apic_get_tmcct(struct kvm_lapic *apic) ASSERT(apic != NULL); /* if initial count is 0, current count should also be 0 */ - if (apic_get_reg(apic, APIC_TMICT) == 0) + if (apic_get_reg(apic, APIC_TMICT) == 0 || + apic->lapic_timer.period == 0) return 0; remaining = hrtimer_get_remaining(&apic->lapic_timer.timer);