From: Venkatesh Srinivas <venkateshs@chromium.org>
To: kvm@vger.kernel.org
Cc: seanjc@google.com, marcorr@google.com, venkateshs@chromium.org
Subject: [PATCH v2 2/2] KVM: Inject #GP on invalid writes to x2APIC registers
Date: Wed, 25 May 2022 17:39:33 +0000 [thread overview]
Message-ID: <20220525173933.1611076-2-venkateshs@chromium.org> (raw)
In-Reply-To: <20220525173933.1611076-1-venkateshs@chromium.org>
From: Marc Orr <marcorr@google.com>
From: Venkatesh Srinivas <venkateshs@chromium.org>
The upper bytes of any x2APIC register are reserved. Inject a #GP
into the guest if any of these reserved bits are set.
Signed-off-by: Marc Orr <marcorr@google.com>
Signed-off-by: Venkatesh Srinivas <venkateshs@chromium.org>
---
arch/x86/kvm/lapic.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 6f8522e8c492..617e4936c5cc 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2907,6 +2907,8 @@ int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
if (!lapic_in_kernel(vcpu) || !apic_x2apic_mode(apic))
return 1;
+ else if (data >> 32)
+ return 1;
return kvm_lapic_msr_write(apic, reg, data);
}
--
2.36.1.124.g0e6072fb45-goog
next prev parent reply other threads:[~2022-05-25 17:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-25 17:39 [PATCH v2 1/2] KVM: Inject #GP on invalid write to APIC_SELF_IPI register Venkatesh Srinivas
2022-05-25 17:39 ` Venkatesh Srinivas [this message]
2022-05-25 18:30 ` [PATCH v2 2/2] KVM: Inject #GP on invalid writes to x2APIC registers Sean Christopherson
2022-05-25 18:42 ` [PATCH v2 1/2] KVM: Inject #GP on invalid write to APIC_SELF_IPI register Sean Christopherson
2022-09-14 21:46 ` Jim Mattson
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