linux-kernel - Re: [PATCH] rv: Fix boot failure when kernel lockdown is active

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Message-ID: <e7ed86066c53078ca55c1ec5c47da7b57cf2ffdf.camel@redhat.com>
Date: Fri, 19 Sep 2025 10:52:32 +0200
From: Gabriele Monaco <gmonaco@...hat.com>
To: Tomas Glozar <tglozar@...hat.com>
Cc: Nam Cao <namcao@...utronix.de>, linux-trace-kernel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, nicolas.bouchinet@....cyber.gouv.fr, Xiu
 Jianfeng	 <xiujianfeng@...weicloud.com>, rostedt@...dmis.org,
 mhiramat@...nel.org
Subject: Re: [PATCH] rv: Fix boot failure when kernel lockdown is active

On Thu, 2025-09-18 at 11:48 +0200, Tomas Glozar wrote:
> čt 18. 9. 2025 v 10:36 odesílatel Gabriele Monaco <gmonaco@...hat.com> napsal:
> > 
> > Yeah totally, I have the feeling that with the kernel there's no such a
> > thing as a "theoretical bug", kinda like a good consequence of Murphy's
> > Law.
> 
> My understanding of "theoretical bug" is that it's code that is
> semantically equivalent to a bug-free code, but becomes buggy after
> doing an "innocent" change. The bug might be more or less
> "theoretical" based on how "innocent" that change is. Of course, in a
> codebase of the size of a Linux kernel, this tends to happen quite
> often, and is not always possible to get rid of completely...

Yeah good point, we are getting philosophical here :) . This wasn't a
theoretical bug then, just something you don't think will really happen (a
failure creating a sysfs directory) ... until it happens.

The fact there is a way to make that function fail on-demand (kernel lockdown),
makes it just more "real". Moral of the story, better get the compiler check
things for you (lock guards).

Anyway the fix is now upstream.

Gabriele