linux-kernel - Re: [PATCH 0/3] KVM: Fix for a mostly benign gpc WARN

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Message-ID: <ZhR74WgWxO4MQcbl@google.com>
Date: Mon, 8 Apr 2024 16:21:05 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: David Woodhouse <dwmw2@...radead.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzbot+106a4f72b0474e1d1b33@...kaller.appspotmail.com, 
	Paul Durrant <paul@....org>
Subject: Re: [PATCH 0/3] KVM: Fix for a mostly benign gpc WARN

On Fri, Mar 22, 2024, David Woodhouse wrote:
> On Tue, 2024-03-19 at 17:15 -0700, Sean Christopherson wrote:
> > Fix a bug found by syzkaller, thanks to a new WARN sanity check, where KVM
> > marks a gfn_to_pfn_cache as active without actually setting gpc->gpa or any
> > other metadata.  On top, harden against _directly_ setting gpc->gpa to KVM's
> > magic INVALID_GPA, which would also fail the sanity check.
> > 
> > Sean Christopherson (3):
> >   KVM: Add helpers to consolidate gfn_to_pfn_cache's page split check
> >   KVM: Check validity of offset+length of gfn_to_pfn_cache prior to
> >     activation
> >   KVM: Explicitly disallow activatating a gfn_to_pfn_cache with
> >     INVALID_GPA
> 
> It looks like these conflict with
> https://lore.kernel.org/kvm/20240227115648.3104-9-dwmw2@infradead.org/
> 
> Want to arrange them to come after it?

Very belated, yes.  Though by the time you read this, they should be in
kvm-x86/next.