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CVE-2013-6367 kvm: division by 0 in apic_get_tmcct (rhbz 1032207 1042081)

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Josh Boyer 2013-12-12 16:06:22 -05:00
parent 04739196f3
commit 69ee1b7392
2 changed files with 111 additions and 0 deletions
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102
KVM-x86-Fix-potential-divide-by-0-in-lapic.patch Normal file
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@ -0,0 +1,102 @@
Bugzilla: 1042081
Upstream-status: 3.13 and sent for stable
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From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: gleb@redhat.com, kvm@vger.kernel.org, pmatouse@redhat.com,
Andy Honig <ahonig@google.com>, stable@vger.kernel.org
Subject: [PATCH] KVM: x86: Fix potential divide by 0 in lapic (CVE-2013-6367)
Date: Thu, 12 Dec 2013 21:36:52 +0100
Message-Id: <1386880614-23300-2-git-send-email-pbonzini@redhat.com>
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From: Andy Honig <ahonig@google.com>
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>
---
arch/x86/kvm/lapic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 5439117d5c4c..89b52ec7d09c 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -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);
--
1.8.3.1
--
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9
kernel.spec
View File

@ -714,6 +714,9 @@ Patch25170: 0001-drm-radeon-dpm-Fix-hwmon-crash.patch
#rhbz 1030802
Patch25171: elantech-Properly-differentiate-between-clickpads-an.patch
#CVE-2013-6367 rhbz 1032207 1042081
Patch25172: KVM-x86-Fix-potential-divide-by-0-in-lapic.patch
# END OF PATCH DEFINITIONS
%endif
@ -1394,6 +1397,9 @@ ApplyPatch 0001-drm-radeon-dpm-Fix-hwmon-crash.patch
#rhbz 1030802
ApplyPatch elantech-Properly-differentiate-between-clickpads-an.patch
#CVE-2013-6367 rhbz 1032207 1042081
ApplyPatch KVM-x86-Fix-potential-divide-by-0-in-lapic.patch
# END OF PATCH APPLICATIONS
%endif
@ -2206,6 +2212,9 @@ fi
# ||----w |
# || ||
%changelog
* Thu Dec 12 2013 Josh Boyer <jwboyer@fedoraproject.org>
- CVE-2013-6367 kvm: division by 0 in apic_get_tmcct (rhbz 1032207 1042081)
* Wed Dec 11 2013 Josh Boyer <jwboyer@fedoraproject.org> - 3.13.0-0.rc3.git2.1
- Linux v3.13-rc3-174-g9538e10