linux-kernel - Re: [PATCH v1] liveupdate: separate memfd support into LIVEUPDATE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CA+CK2bA6qr8C-EtpprDZKZP9-VJyoOdZ4XHndd+GcQ66OqBVbg@mail.gmail.com>
Date: Tue, 30 Dec 2025 09:54:14 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Pratyush Yadav <pratyush@...nel.org>
Cc: akpm@...ux-foundation.org, rppt@...nel.org, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org
Subject: Re: [PATCH v1] liveupdate: separate memfd support into LIVEUPDATE_MEMFD

On Mon, Dec 29, 2025 at 3:52 PM Pratyush Yadav <pratyush@...nel.org> wrote:
>
> Hi Pasha,
>
> On Tue, Dec 23 2025, Pasha Tatashin wrote:
>
> > Decouple memfd preservation support from the core Live Update
> > Orchestrator configuration.
> >
> > Previously, enabling CONFIG_LIVEUPDATE forced a dependency on
> > CONFIG_SHMEM and unconditionally compiled memfd_luo.o. However, Live
> > Update may be used for purposes that do not require memfd-backed memory
> > preservation.
>
> I initially didn't add a new config mainly because there was no other
> user of LUO. So disabling LIVEUPDATE_MEMFD makes LUO entirely useless.
>
> Anyway, we will eventually get other subsystems and this config will
> start making sense then. Might as well do it now.
>
> >
> > Introduce CONFIG_LIVEUPDATE_MEMFD to gate memfd_luo.o. This moves the
> > SHMEM and MEMFD_CREATE dependencies to the specific feature that needs
> > them, allowing the base LIVEUPDATE option to be selected independently
> > of shared memory support.
> >
> > Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> > ---
> >  kernel/liveupdate/Kconfig | 16 +++++++++++++++-
> >  mm/Makefile               |  2 +-
>
> I think you should also update tools/testing/selftests/liveupdate/config
> to enable this config.

Done

>
> With that,
>
> Reviewed-by: Pratyush Yadav <pratyush@...nel.org>

Thanks.

Pasha