linux-kernel - Re: [PATCH 1/6] KVM: nSVM: Check the value written to MSR_VM_HSAVE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4318c980-6eff-7b74-ae99-b3210021789d@redhat.com>
Date:   Thu, 8 Jul 2021 19:27:22 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Cathy Avery <cavery@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Michael Roth <mdroth@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] KVM: nSVM: Check the value written to MSR_VM_HSAVE_PA

On 07/07/21 12:28, Maxim Levitsky wrote:
> Minor nitpick: I would have checked the host provided value as well,
> just in case since there is no reason why it won't pass the same check,
> and fail if the value is not aligned.

The reason not to do so is that it would allow a guest running an old 
kernel to defeat live migration.

Paolo

> Other than that:
> Reviewed-by: Maxim Levitsky<mlevitsk@...hat.com>