linux-kernel - Re: [patch V2 27/28] x86/speculation: Add seccomp Spectre v2 user space protection mode

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Message-ID: <2272cd70-e7e7-871a-7579-208073b6ca85@intel.com>
Date:   Tue, 4 Dec 2018 10:45:07 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jiri Kosina <jkosina@...e.cz>,
        Tom Lendacky <thomas.lendacky@....com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.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>,
        Waiman Long <longman9394@...il.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Dave Stewart <david.c.stewart@...el.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [patch V2 27/28] x86/speculation: Add seccomp Spectre v2 user
 space protection mode

>  static const char * const spectre_v2_user_strings[] = {
>  	[SPECTRE_V2_USER_NONE]		= "User space: Vulnerable",
>  	[SPECTRE_V2_USER_STRICT]	= "User space: Mitigation: STIBP protection",
>  	[SPECTRE_V2_USER_PRCTL]		= "User space: Mitigation: STIBP via prctl",
> +	[SPECTRE_V2_USER_SECCOMP]	= "User space: Mitigation: STIBP via seccomp and prctl",
>  };

Since there's some heartburn about the STIBP naming, should we make this
more generic?  Maybe something like "SMT hardening", so it says:

	"User space: Mitigation: SMT hardening via prctl"

or,

 	"User space: Mitigation: maybe go slow on indirect branches via prctl"

if we're trying be more precise on the effects. :)