linux-kernel - Re: [PATCH 0/4] KVM: x86: fix bugs reported by Dan Carpenter

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Date:   Thu, 18 May 2017 21:25:07 +0200
From:   Radim Krčmář <rkrcmar@...hat.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH 0/4] KVM: x86: fix bugs reported by Dan Carpenter

2017-05-18 20:52+0200, Paolo Bonzini:
> On 18/05/2017 19:37, Radim Krčmář wrote:
> > It would be possible to make reproducers for the first three patches,
> > but they happen under circumstances too remote from normal use, so I
> > didn't test them like that. :)
> > 
> > 
> > Radim Krčmář (4):
> >   KVM: nVMX: fix nested_vmx_check_vmptr failure paths under debugging
> >   KVM: x86: zero base3 of unusable segments
> >   KVM: x86/vPMU: fix undefined shift in intel_pmu_refresh()
> >   KVM: x86: prevent uninitialized variable warning in check_svme()
> > 
> >  arch/x86/kvm/emulate.c   |  2 +-
> >  arch/x86/kvm/pmu_intel.c |  2 +-
> >  arch/x86/kvm/vmx.c       | 31 ++++++++++++++++++-------------
> >  arch/x86/kvm/x86.c       |  2 ++
> >  4 files changed, 22 insertions(+), 15 deletions(-)
> > 
> 
> Patch 1 is ugly, but I don't have any better idea.

I agree.  Adding another argument was clearly worse, but I almost chose
to keep the skip in nested_vmx_check_vmptr() and return it +1, to signal
an error, and then subtract 1 before returning from the exit handler.

> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>

Thanks.