[PATCH 4.9 046/116] KVM: x86: Protect kvm_lapic_reg_write() from Spectre-v1/L1TF attacks

From: Greg Kroah-Hartman
Date: Thu Feb 13 2020 - 11:05:29 EST


From: Marios Pomonis <pomonis@xxxxxxxxxx>

commit 4bf79cb089f6b1c6c632492c0271054ce52ad766 upstream.

This fixes a Spectre-v1/L1TF vulnerability in kvm_lapic_reg_write().
This function contains index computations based on the
(attacker-controlled) MSR number.

Fixes: 0105d1a52640 ("KVM: x2apic interface to lapic")

Signed-off-by: Nick Finco <nifi@xxxxxxxxxx>
Signed-off-by: Marios Pomonis <pomonis@xxxxxxxxxx>
Reviewed-by: Andrew Honig <ahonig@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/x86/kvm/lapic.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -28,6 +28,7 @@
#include <linux/export.h>
#include <linux/math64.h>
#include <linux/slab.h>
+#include <linux/nospec.h>
#include <asm/processor.h>
#include <asm/msr.h>
#include <asm/page.h>
@@ -1587,15 +1588,20 @@ int kvm_lapic_reg_write(struct kvm_lapic
case APIC_LVTTHMR:
case APIC_LVTPC:
case APIC_LVT1:
- case APIC_LVTERR:
+ case APIC_LVTERR: {
/* TODO: Check vector */
+ size_t size;
+ u32 index;
+
if (!kvm_apic_sw_enabled(apic))
val |= APIC_LVT_MASKED;
-
- val &= apic_lvt_mask[(reg - APIC_LVTT) >> 4];
+ size = ARRAY_SIZE(apic_lvt_mask);
+ index = array_index_nospec(
+ (reg - APIC_LVTT) >> 4, size);
+ val &= apic_lvt_mask[index];
kvm_lapic_set_reg(apic, reg, val);
-
break;
+ }

case APIC_LVTT:
if (!kvm_apic_sw_enabled(apic))