linux-kernel - Re: [PATCH v3 1/1] x86/boot/compressed: Fix avoiding memmap in physical KASLR

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Message-ID: <CAAi7L5cPEkjXgFF-_dkC=e7WSu9t_n1XmShPv1F=_1LsmWkNkg@mail.gmail.com>
Date: Mon, 8 Dec 2025 14:27:54 +0100
From: Michał Cłapiński <mclapinski@...gle.com>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Ard Biesheuvel <ardb@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, Chris Li <chrisl@...nel.org>, 
	x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, Dan Williams <dan.j.williams@...el.com>, 
	Pasha Tatashin <pasha.tatashin@...een.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/1] x86/boot/compressed: Fix avoiding memmap in
 physical KASLR

On Thu, Nov 6, 2025 at 5:36 PM Dave Hansen <dave.hansen@...el.com> wrote:
>
> On 11/6/25 08:32, Ard Biesheuvel wrote:
> > This looks fine to me, but as I noted before, I'd happily simply
> > disable physical KASLR entirely if 'memmap=' appears at all.
>
> Hey, post the patch and we'll see which one looks better.

Ard's solution [1] hasn't been merged anywhere AFAIK. The bug persists.

Can we merge my solution to fix the issue sooner rather than later?
Merging my code won't prevent Ard's simplification from being merged
in the future if the maintainers so choose.

[1] https://lore.kernel.org/all/20251106173019.1224443-2-ardb+git@google.com/