linux-kernel - Re: [PATCH v7 17/22] selftests/liveupdate: Add kexec-based selftest for

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

Message-ID: <aSPtPuBUcVT5Rifl@kernel.org>
Date: Mon, 24 Nov 2025 07:29:34 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: pratyush@...nel.org, jasonmiu@...gle.com, graf@...zon.com,
	dmatlack@...gle.com, rientjes@...gle.com, corbet@....net,
	rdunlap@...radead.org, ilpo.jarvinen@...ux.intel.com,
	kanie@...ux.alibaba.com, ojeda@...nel.org, aliceryhl@...gle.com,
	masahiroy@...nel.org, akpm@...ux-foundation.org, tj@...nel.org,
	yoann.congal@...le.fr, mmaurer@...gle.com, roman.gushchin@...ux.dev,
	chenridong@...wei.com, axboe@...nel.dk, mark.rutland@....com,
	jannh@...gle.com, vincent.guittot@...aro.org, hannes@...xchg.org,
	dan.j.williams@...el.com, david@...hat.com,
	joel.granados@...nel.org, rostedt@...dmis.org,
	anna.schumaker@...cle.com, song@...nel.org, linux@...ssschuh.net,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-mm@...ck.org, gregkh@...uxfoundation.org, tglx@...utronix.de,
	mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
	x86@...nel.org, hpa@...or.com, rafael@...nel.org, dakr@...nel.org,
	bartosz.golaszewski@...aro.org, cw00.choi@...sung.com,
	myungjoo.ham@...sung.com, yesanishhere@...il.com,
	Jonathan.Cameron@...wei.com, quic_zijuhu@...cinc.com,
	aleksander.lobakin@...el.com, ira.weiny@...el.com,
	andriy.shevchenko@...ux.intel.com, leon@...nel.org, lukas@...ner.de,
	bhelgaas@...gle.com, wagi@...nel.org, djeffery@...hat.com,
	stuart.w.hayes@...il.com, ptyadav@...zon.de, lennart@...ttering.net,
	brauner@...nel.org, linux-api@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, saeedm@...dia.com,
	ajayachandra@...dia.com, jgg@...dia.com, parav@...dia.com,
	leonro@...dia.com, witu@...dia.com, hughd@...gle.com,
	skhawaja@...gle.com, chrisl@...nel.org
Subject: Re: [PATCH v7 17/22] selftests/liveupdate: Add kexec-based selftest
 for

On Sat, Nov 22, 2025 at 05:23:44PM -0500, Pasha Tatashin wrote:
> Subject: selftests/liveupdate: Add kexec-based selftest for

                                                         ^ for what? ;-)

> Introduce a kexec-based selftest, luo_kexec_simple, to validate the
> end-to-end lifecycle of a Live Update Orchestrator (LUO) session across
> a reboot.
> 
> While existing tests verify the uAPI in a pre-reboot context, this test
> ensures that the core functionality—preserving state via Kexec Handover
> and restoring it in a new kernel—works as expected.
> 
> The test operates in two stages, managing its state across the reboot by
> preserving a dedicated "state session" containing a memfd. This
> mechanism dogfoods the LUO feature itself for state tracking, making the
> test self-contained.
> 
> The test validates the following sequence:
> 
> Stage 1 (Pre-kexec):
>  - Creates a test session (test-session).
>  - Creates and preserves a memfd with a known data pattern into the test
>    session.
>  - Creates the state-tracking session to signal progression to Stage 2.
>  - Executes a kexec reboot via a helper script.
> 
> Stage 2 (Post-kexec):
>  - Retrieves the state-tracking session to confirm it is in the
>    post-reboot stage.
>  - Retrieves the preserved test session.
>  - Restores the memfd from the test session and verifies its contents
>    match the original data pattern written in Stage 1.
>  - Finalizes both the test and state sessions to ensure a clean
>    teardown.
> 
> The test relies on a helper script (do_kexec.sh) to perform the reboot
> and a shared utility library (luo_test_utils.c) for common LUO
> operations, keeping the main test logic clean and focused.
> 
> Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
> Reviewed-by: Zhu Yanjun <yanjun.zhu@...ux.dev>

Reviewed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>

> ---
>  tools/testing/selftests/liveupdate/Makefile   |   6 +
>  .../testing/selftests/liveupdate/do_kexec.sh  |  16 ++
>  .../selftests/liveupdate/luo_kexec_simple.c   |  89 ++++++
>  .../selftests/liveupdate/luo_test_utils.c     | 266 ++++++++++++++++++
>  .../selftests/liveupdate/luo_test_utils.h     |  44 +++
>  5 files changed, 421 insertions(+)
>  create mode 100755 tools/testing/selftests/liveupdate/do_kexec.sh
>  create mode 100644 tools/testing/selftests/liveupdate/luo_kexec_simple.c
>  create mode 100644 tools/testing/selftests/liveupdate/luo_test_utils.c
>  create mode 100644 tools/testing/selftests/liveupdate/luo_test_utils.h

-- 
Sincerely yours,
Mike.