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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-03-25 14:21:38 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-03-29 13:21:21 -0400 |
| commit | 7ec37d1cbe17d8189d9562178d8b29167fe1c31a (patch) | |
| tree | 0109bfd3ab51fd0b929481f3ea8c45aa76ae1e18 /arch | |
| parent | cde363ab7ca7aea7a853851cd6a6745a9e1aaf5e (diff) | |
| download | linux-stable-7ec37d1cbe17d8189d9562178d8b29167fe1c31a.tar.gz linux-stable-7ec37d1cbe17d8189d9562178d8b29167fe1c31a.tar.bz2 linux-stable-7ec37d1cbe17d8189d9562178d8b29167fe1c31a.zip | |
KVM: x86: Check lapic_in_kernel() before attempting to set a SynIC irq
When KVM_CAP_HYPERV_SYNIC{,2} is activated, KVM already checks for
irqchip_in_kernel() so normally SynIC irqs should never be set. It is,
however, possible for a misbehaving VMM to write to SYNIC/STIMER MSRs
causing erroneous behavior.
The immediate issue being fixed is that kvm_irq_delivery_to_apic()
(kvm_irq_delivery_to_apic_fast()) crashes when called with
'irq.shorthand = APIC_DEST_SELF' and 'src == NULL'.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220325132140.25650-2-vkuznets@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/hyperv.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index a32f54ab84a2..f715b5a2b0e4 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -449,6 +449,9 @@ static int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint) struct kvm_lapic_irq irq; int ret, vector; + if (KVM_BUG_ON(!lapic_in_kernel(vcpu), vcpu->kvm)) + return -EINVAL; + if (sint >= ARRAY_SIZE(synic->sint)) return -EINVAL; |