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KVM: x86: Inject #GP if WRMSR sets reserved bits in APIC Self-IPI

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Inject a #GP if the guest attempts to set reserved bits in the x2APIC-only
Self-IPI register.  Bits 7:0 hold the vector, all other bits are reserved.

Reported-by: Marc Orr <marcorr@google.com>
Cc: Ben Gardon <bgardon@google.com>
Cc: Venkatesh Srinivas <venkateshs@chromium.org>
Cc: stable@vger.kernel.org
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20230107011025.565472-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-01-07 01:10:20 +00:00
parent 85e64d09f7
commit ba5838abb0
1 changed files with 7 additions and 3 deletions
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10
arch/x86/kvm/lapic.c
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@ -2324,10 +2324,14 @@ static int kvm_lapic_reg_write(struct kvm_lapic *apic, u32 reg, u32 val)
break;
case APIC_SELF_IPI:
if (apic_x2apic_mode(apic))
kvm_apic_send_ipi(apic, APIC_DEST_SELF | (val & APIC_VECTOR_MASK), 0);
else
/*
* Self-IPI exists only when x2APIC is enabled. Bits 7:0 hold
* the vector, everything else is reserved.
*/
if (!apic_x2apic_mode(apic) || (val & ~APIC_VECTOR_MASK))
ret = 1;
else
kvm_apic_send_ipi(apic, APIC_DEST_SELF | val, 0);
break;
default:
ret = 1;