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KVM: x86: Fully initialize 'struct kvm_lapic_irq' in kvm_pv_kick_cpu_op()

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[ Upstream commit 8a414f943f8b5f94bbaafdec863d6f3dbef33f8a ]

'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: a183b638b6 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Vitaly Kuznetsov
2022-07-08 14:51:47 +02:00
committed by Greg Kroah-Hartman
parent c2978d0124
commit eb58fd350a
1 changed files with 10 additions and 8 deletions
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18
arch/x86/kvm/x86.c
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@@ -8142,15 +8142,17 @@ static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
*/ */
static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid) static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
{ {
struct kvm_lapic_irq lapic_irq; /*
* 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.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;
lapic_irq.delivery_mode = APIC_DM_REMRD;
kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL); kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
} }