linux-kernel - Re: [PATCH 13/15] x86/fsgsbase/64: With FSGSBASE, compare GS bases on paranoid

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Message-ID: <09869EF2-48CC-4C66-A762-94C0C2B798E1@intel.com>
Date:   Tue, 20 Mar 2018 17:03:46 +0000
From:   "Bae, Chang Seok" <chang.seok.bae@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
CC:     X86 ML <x86@...nel.org>, Andi Kleen <ak@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Metzger, Markus T" <markus.t.metzger@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH 13/15] x86/fsgsbase/64: With FSGSBASE, compare GS bases
 on paranoid_entry

On 3/20/18, 07:58, "Andy Lutomirski" <luto@...nel.org> wrote:
> The original version of these patches (mine and Andi’s) didn’t have
>  this comparison, didn’t need RDMSR, and didn’t allow malicious user
To be clear, RDMSR is not needed (with FSGSBASE)