linux-kernel - Re: [PATCH v2 08/13] KVM: x86: Protect MSR-based index computations in pmu.h from Spectre-v1/L1TF attacks

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Message-ID: <CALMp9eQmWB9WZaD=n5rTZEzWkjBx_emTn3zaVxk7YrwBGv2VrQ@mail.gmail.com>
Date:   Mon, 6 Jan 2020 12:18:31 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Marios Pomonis <pomonis@...gle.com>
Cc:     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 08/13] KVM: x86: Protect MSR-based index computations
 in pmu.h from Spectre-v1/L1TF attacks

On Wed, Dec 11, 2019 at 12:49 PM Marios Pomonis <pomonis@...gle.com> wrote:
>
> This fixes a Spectre-v1/L1TF vulnerability in the get_gp_pmc() and
> get_fixed_pmc() functions.
> They both contain index computations based on the (attacker-controlled)
> MSR number.
>
> Fixes: commit 25462f7f5295 ("KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch")
>
> 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>