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authorVitaly Kuznetsov <vkuznets@redhat.com>2022-07-08 15:51:47 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2022-07-14 19:09:43 +0300
commit8a414f943f8b5f94bbaafdec863d6f3dbef33f8a (patch)
treeb2bcebf8ef4caeae36d129e65d10fad4a646f041 /arch
parentcca3f3381bef16ae04933cc3ff480952f7ae298f (diff)
downloadlinux-8a414f943f8b5f94bbaafdec863d6f3dbef33f8a.tar.xz
KVM: x86: Fully initialize 'struct kvm_lapic_irq' in kvm_pv_kick_cpu_op()
'vector' and 'trig_mode' fields of 'struct kvm_lapic_irq' are left uninitialized in kvm_pv_kick_cpu_op(). While these fields are normally not needed for APIC_DM_REMRD, they're still referenced by __apic_accept_irq() for trace_kvm_apic_accept_irq(). Fully initialize the structure to avoid consuming random stack memory. Fixes: a183b638b61c ("KVM: x86: make apic_accept_irq tracepoint more generic") Reported-by: syzbot+d6caa905917d353f0d07@syzkaller.appspotmail.com Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220708125147.593975-1-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/x86.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0c3e85e8fce9..143e37298d8a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9143,15 +9143,17 @@ static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
*/
static void kvm_pv_kick_cpu_op(struct kvm *kvm, int apicid)
{
- struct kvm_lapic_irq lapic_irq;
-
- lapic_irq.shorthand = APIC_DEST_NOSHORT;
- lapic_irq.dest_mode = APIC_DEST_PHYSICAL;
- lapic_irq.level = 0;
- lapic_irq.dest_id = apicid;
- lapic_irq.msi_redir_hint = false;
+ /*
+ * All other fields are unused for APIC_DM_REMRD, but may be consumed by
+ * common code, e.g. for tracing. Defer initialization to the compiler.
+ */
+ struct kvm_lapic_irq lapic_irq = {
+ .delivery_mode = APIC_DM_REMRD,
+ .dest_mode = APIC_DEST_PHYSICAL,
+ .shorthand = APIC_DEST_NOSHORT,
+ .dest_id = apicid,
+ };
- lapic_irq.delivery_mode = APIC_DM_REMRD;
kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
}