linux-kernel - Re: [PATCH] KVM: x86/xen: Fix bug in kvm_xen_vcpu_set

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Date:   Fri, 29 Jul 2022 18:29:07 -0500
From:   Coleman Dietsch <dietschc@....edu>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     kvm@...r.kernel.org, x86@...nel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        syzbot+e54f930ed78eb0f85281@...kaller.appspotmail.com,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Pavel Skripkin <paskripkin@...il.com>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] KVM: x86/xen: Fix bug in kvm_xen_vcpu_set_attr()

On Fri, Jul 29, 2022 at 09:41:02AM +0200, Greg KH wrote:
> On Thu, Jul 28, 2022 at 02:47:37PM -0500, Coleman Dietsch wrote:
> > This crash appears to be happening when vcpu->arch.xen.timer is already set and kvm_xen_init_timer(vcpu) is called.
> 
> What does "this crash" refer to ?
> 
> > 
> > During testing with the syzbot reproducer code it seemed apparent that the else if statement in the KVM_XEN_VCPU_ATTR_TYPE_TIMER switch case was not being reached, which is where the kvm_xen_stop_timer(vcpu) call is located.
> 
> Please properly wrap your kernel changelog at 72 columns.
> 
> Didn't checkpatch.pl complain about this?
> 

I believe I made the mistake of editing the patch file directly so it was
on me for forgetting to run checkpatch.pl manually.

> thanks,
> 
> greg k-h

Thanks for the feedback Greg, I believe I have (at least these) issues
resolved in the next version of the patch.