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: <86cy3x9fkj.fsf@kernel.org>
Date: Mon, 29 Dec 2025 21:51:56 +0100
From: Pratyush Yadav <pratyush@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: akpm@...ux-foundation.org,  rppt@...nel.org,
  linux-kernel@...r.kernel.org,  linux-mm@...ck.org,  pratyush@...nel.org
Subject: Re: [PATCH v1] liveupdate: separate memfd support into
 LIVEUPDATE_MEMFD

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.

With that,

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

>  2 files changed, 16 insertions(+), 2 deletions(-)
>
[...]

-- 
Regards,
Pratyush Yadav