linux-kernel - Re: [PATCH v12 00/18] Enable FSGSBASE instructions

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Message-ID: <067d58cf-3828-5b94-0f78-682ba2670739@intel.com>
Date:   Fri, 22 May 2020 13:55:56 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Don Porter <porter@...unc.edu>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Andi Kleen <ak@...ux.intel.com>, Sasha Levin <sashal@...nel.org>,
        linux-kernel@...r.kernel.org, bp@...en8.de, luto@...nel.org,
        hpa@...or.com, tony.luck@...el.com, ravi.v.shankar@...el.com,
        chang.seok.bae@...el.com
Subject: Re: [PATCH v12 00/18] Enable FSGSBASE instructions

On 5/22/20 1:14 PM, Don Porter wrote:
> I wanted to clarify that we never intended the Graphene kernel module
> you mention for production use, as well as to comment in support of this
> patch.

Could you also clarify: Did you know that the FSGSBASE kernel module
introduced a root vulnerability?  Where did it come from in the first place?