linux-kernel - Re: [RFC/RFT PATCH 01/19] x86/idt: Move idt_table to __ro_after

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Message-ID: <CAMj1kXEVEbZGaVKdLp-95ffFv_cy181sB791LJYptkL+ap3VhQ@mail.gmail.com>
Date: Thu, 22 Jan 2026 15:09:19 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Kees Cook <kees@...nel.org>, 
	Uros Bizjak <ubizjak@...il.com>, Brian Gerst <brgerst@...il.com>, linux-hardening@...r.kernel.org
Subject: Re: [RFC/RFT PATCH 01/19] x86/idt: Move idt_table to __ro_after_init section

On Thu, 22 Jan 2026 at 14:58, Borislav Petkov <bp@...en8.de> wrote:
>
> On Thu, Jan 22, 2026 at 02:48:14PM +0100, Ard Biesheuvel wrote:
> > That is because the init region is between .data and .bss, which are
> > not 2M aligned, and so freeing/remapping the init region breaks the
> > hugepage mapping of the region between them. This is addressed in
> > patch #3.
>
> Ok, I'll continue looking but this commit message should not mislead in
> stating that it prevents the "breaking up large page mappings."

It does. It just doesn't prevent if from happening for other reasons.

> I'll fix it up
> if I end up picking up this or you fix it up in your next revision please.
>

Ack.