linux-kernel - Re: [PATCH v2] KVM: x86: Fully initialize 'struct kvm_lapic_irq' in kvm_pv_kick_cpu

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Message-ID: <87let3ptlt.fsf@redhat.com>
Date:   Fri, 08 Jul 2022 16:27:42 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     linux-hyperv@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v2] KVM: x86: Fully initialize 'struct kvm_lapic_irq' in
 kvm_pv_kick_cpu_op()

Vitaly Kuznetsov <vkuznets@...hat.com> writes:

> '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@...kaller.appspotmail.com
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>

The patch was sent to linux-hyperv@ by mistake, my apologies.

-- 
Vitaly