linux-kernel - Re: [PATCH v5 14/20] x86/bugs: Add attack vector controls for BHI

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Message-ID: <20250703100155.GAaGZVEwI9BWv9Cwjs@fat_crate.local>
Date: Thu, 3 Jul 2025 12:01:55 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Kaplan, David" <David.Kaplan@....com>
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 14/20] x86/bugs: Add attack vector controls for BHI

On Wed, Jul 02, 2025 at 06:24:31PM +0000, Kaplan, David wrote:
> So probably the right answer here is to split this up.  I'll change the
> patch to just use the existing mitigations and structure it like your
> snippet above.  If someone wants to add a new user->kernel only option for
> BHI, that can be done in a separate patch later.  There's actually probably
> several other mitigations that could similarly be split up based on attack
> vector (e.g. have separate controls for VERW in various places), if we
> wanted to have more mitigation options based on attack vectors (instead of
> just a simple on/off).

Yeah, the thought that our mitigations are not really consistent wrt vectors
did cross my mind. We should definitely keep this in mind and perhaps
restructure them into a common pattern later, if it turns beneficial.

Thx.

-- 
Regards/Gruss,
    Boris.

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