Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <20191211204753.242298-1-pomonis@google.com> <20191211204753.242298-8-pomonis@google.com>
In-Reply-To: <20191211204753.242298-8-pomonis@google.com>
From:   Jim Mattson <jmattson@google.com>
Date:   Mon, 6 Jan 2020 12:18:11 -0800
Message-ID: <CALMp9eSvJYzuYmn6sUo5zNGLAmA=d_Pu4DcmCQTMAFCP_dBHsg@mail.gmail.com>
Subject: Re: [PATCH v2 07/13] KVM: x86: Protect MSR-based index computations
 in fixed_msr_to_seg_unit() from Spectre-v1/L1TF attacks
To:     Marios Pomonis <pomonis@google.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Sean Christopherson <sean.j.christopherson@intel.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Joerg Roedel <joro@8bytes.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        kvm list <kvm@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Nick Finco <nifi@google.com>, Andrew Honig <ahonig@google.com>,
        stable@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Dec 11, 2019 at 12:48 PM Marios Pomonis <pomonis@google.com> wrote:
>
> This fixes a Spectre-v1/L1TF vulnerability in fixed_msr_to_seg_unit().
> This function contains index computations based on the
> (attacker-controlled) MSR number.
>
> Fixes: commit de9aef5e1ad6 ("KVM: MTRR: introduce fixed_mtrr_segment table")
>
> Signed-off-by: Nick Finco <nifi@google.com>
> Signed-off-by: Marios Pomonis <pomonis@google.com>
> Reviewed-by: Andrew Honig <ahonig@google.com>
> Cc: stable@vger.kernel.org

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