linux-kernel - Re: [PATCH v2 02/13] KVM: x86: Protect kvm_hv_msr_[get|set]_crash

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Message-ID: <CALMp9eQ5S1oD6YtEp-peX+iLRbX5bhRVTrD4DamAsDJtwe7yOA@mail.gmail.com>
Date:   Mon, 6 Jan 2020 12:16:41 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Christian Borntraeger <borntraeger@...ibm.com>
Cc:     Marios Pomonis <pomonis@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Nick Finco <nifi@...gle.com>, Andrew Honig <ahonig@...gle.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2 02/13] KVM: x86: Protect kvm_hv_msr_[get|set]_crash_data()
 from Spectre-v1/L1TF attacks

On Thu, Dec 12, 2019 at 9:47 AM Christian Borntraeger
<borntraeger@...ibm.com> wrote:
>
>
>
> On 12.12.19 18:44, Jim Mattson wrote:
> > On Thu, Dec 12, 2019 at 9:31 AM Christian Borntraeger
> > <borntraeger@...ibm.com> wrote:
> >>
> >>
> >>
> >> On 11.12.19 21:47, Marios Pomonis wrote:
> >>> This fixes Spectre-v1/L1TF vulnerabilities in kvm_hv_msr_get_crash_data()
> >>> and kvm_hv_msr_set_crash_data().
> >>> These functions contain index computations that use the
> >>> (attacker-controlled) MSR number.
> >>>
> >>> Fixes: commit e7d9513b60e8 ("kvm/x86: added hyper-v crash msrs into kvm hyperv context")
> >>>
> >>> Signed-off-by: Nick Finco <nifi@...gle.com>
> >>> Signed-off-by: Marios Pomonis <pomonis@...gle.com>
> >>> Reviewed-by: Andrew Honig <ahonig@...gle.com>
> >>> Cc: stable@...r.kernel.org

Reviewed-by: Jim Mattson <jmattson@...gle.com>