From 670564559ca35b439c8d8861fc399451ddf95137 Mon Sep 17 00:00:00 2001 From: Marios Pomonis Date: Wed, 11 Dec 2019 12:47:45 -0800 Subject: KVM: x86: Protect ioapic_write_indirect() from Spectre-v1/L1TF attacks This fixes a Spectre-v1/L1TF vulnerability in ioapic_write_indirect(). This function contains index computations based on the (attacker-controlled) IOREGSEL register. This patch depends on patch "KVM: x86: Protect ioapic_read_indirect() from Spectre-v1/L1TF attacks". Fixes: 70f93dae32ac ("KVM: Use temporary variable to shorten lines.") Signed-off-by: Nick Finco Signed-off-by: Marios Pomonis Reviewed-by: Andrew Honig Cc: stable@vger.kernel.org Reviewed-by: Jim Mattson Signed-off-by: Paolo Bonzini --- arch/x86/kvm/ioapic.c | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/x86/kvm/ioapic.c') diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c index c5776febb517..26aa22cb9b29 100644 --- a/arch/x86/kvm/ioapic.c +++ b/arch/x86/kvm/ioapic.c @@ -297,6 +297,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) if (index >= IOAPIC_NUM_PINS) return; + index = array_index_nospec(index, IOAPIC_NUM_PINS); e = &ioapic->redirtbl[index]; mask_before = e->fields.mask; /* Preserve read-only fields */ -- cgit v1.2.3