linux-kernel - Re: [PATCH -v2] x86/retpoline: Ensure default return thunk isn't used at runtime

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Date: Thu, 4 Apr 2024 16:44:00 +0200
From: Borislav Petkov <bp@...en8.de>
To: Klara Modin <klarasmodin@...il.com>
Cc: Josh Poimboeuf <jpoimboe@...nel.org>,
	"Kaplan, David" <David.Kaplan@....com>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-tip-commits@...r.kernel.org" <linux-tip-commits@...r.kernel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	"x86@...nel.org" <x86@...nel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH -v2] x86/retpoline: Ensure default return thunk isn't
 used at runtime

On Thu, Apr 04, 2024 at 12:25:42AM +0200, Klara Modin wrote:
> All the more reason to continue then, even if only for nostalgia ;)

Here's an argument for you: please save the environment by using only
64-bit hw. :-P

> Jokes aside, I do run -next kernels regularly for my daily drivers (which
> are x86_64), but it's honestly not very often I notice bugs there that
> affect me. They have all been pretty minor or very obvious and would
> probably have been caught regardless, but I'll of course still report them.

That's good.

What you could also do is build random configs on linux-next - "make
randconfig" - and see if you catch something weird there. And maybe then
try to boot them in a VM and see what explodes.

In general, testing linux-next is a very good idea because it helps us
catch crap early and fix it before it hits the official releases.

Thx.

-- 
Regards/Gruss,
    Boris.

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