linux-kernel - Re: [Patch v3 00/13] Provide process property based options to enable Spectre v2 userspace-userspace protection

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Message-ID: <20181019075740.GY3121@hirez.programming.kicks-ass.net>
Date:   Fri, 19 Oct 2018 09:57:40 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Andi Kleen <ak@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Casey Schaufler <casey.schaufler@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Jon Masters <jcm@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org
Subject: Re: [Patch v3 00/13] Provide process property based options to
 enable Spectre v2 userspace-userspace protection

On Wed, Oct 17, 2018 at 10:59:28AM -0700, Tim Chen wrote:
> Application to application exploit is in general difficult due to address
> space layout randomization in applications and the need to know an

Does the BTB attack on KASLR not work for userspace?