linux-kernel - Re: [PATCH 0/2] Introduce CABA helper process tree

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Message-ID: <cb7f3533-a904-ef0f-e3a9-39eed6775aad@virtuozzo.com>
Date:   Fri, 10 Jun 2022 19:38:59 +0300
From:   Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
To:     linux-kernel@...r.kernel.org
Cc:     Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-ia64@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, kernel@...nvz.org
Subject: Re: [PATCH 0/2] Introduce CABA helper process tree

CC: kernel@...nvz.org

On 10.06.2022 19:32, Pavel Tikhomirov wrote:
> Please see "Add CABA tree to task_struct" for deeper explanation, and
> "tests: Add CABA selftest" for a small test and an actual case for which
> we might need CABA.
> 
> Probably the original problem of restoring process tree with complex
> sessions can be resolved by allowing sessions copying, like we do for
> process group, but I'm not sure if that would be too secure to do it,
> and if there would not be another similar resource in future.
> 
> We can use CABA not only for CRIU for restoring processes, in normal
> life when processes detach CABA will help to understand from which place
> in process tree they were originally started from sshd/crond or
> something else.
> 
> Hope my idea is not completely insane =)
> 
> CC: Eric Biederman <ebiederm@...ssion.com>
> CC: Kees Cook <keescook@...omium.org>
> CC: Alexander Viro <viro@...iv.linux.org.uk>
> CC: Ingo Molnar <mingo@...hat.com>
> CC: Peter Zijlstra <peterz@...radead.org>
> CC: Juri Lelli <juri.lelli@...hat.com>
> CC: Vincent Guittot <vincent.guittot@...aro.org>
> CC: Dietmar Eggemann <dietmar.eggemann@....com>
> CC: Steven Rostedt <rostedt@...dmis.org>
> CC: Ben Segall <bsegall@...gle.com>
> CC: Mel Gorman <mgorman@...e.de>
> CC: Daniel Bristot de Oliveira <bristot@...hat.com>
> CC: Valentin Schneider <vschneid@...hat.com>
> CC: Andrew Morton <akpm@...ux-foundation.org>
> CC: linux-ia64@...r.kernel.org
> CC: linux-kernel@...r.kernel.org
> CC: linux-mm@...ck.org
> CC: linux-fsdevel@...r.kernel.org
> 
> Pavel Tikhomirov (2):
>    Add CABA tree to task_struct
>    tests: Add CABA selftest
> 
>   arch/ia64/kernel/mca.c                   |   3 +
>   fs/exec.c                                |   1 +
>   fs/proc/array.c                          |  18 +
>   include/linux/sched.h                    |   7 +
>   init/init_task.c                         |   3 +
>   kernel/exit.c                            |  50 ++-
>   kernel/fork.c                            |   4 +
>   tools/testing/selftests/Makefile         |   1 +
>   tools/testing/selftests/caba/.gitignore  |   1 +
>   tools/testing/selftests/caba/Makefile    |   7 +
>   tools/testing/selftests/caba/caba_test.c | 501 +++++++++++++++++++++++
>   tools/testing/selftests/caba/config      |   1 +
>   12 files changed, 591 insertions(+), 6 deletions(-)
>   create mode 100644 tools/testing/selftests/caba/.gitignore
>   create mode 100644 tools/testing/selftests/caba/Makefile
>   create mode 100644 tools/testing/selftests/caba/caba_test.c
>   create mode 100644 tools/testing/selftests/caba/config
> 

-- 
Best regards, Tikhomirov Pavel
Software Developer, Virtuozzo.