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

[Pavel Tikhomirov]

CC: kernel@xxxxxxxxxx

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@xxxxxxxxxxxx>
> CC: Kees Cook <keescook@xxxxxxxxxxxx>
> CC: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
> CC: Ingo Molnar <mingo@xxxxxxxxxx>
> CC: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> CC: Juri Lelli <juri.lelli@xxxxxxxxxx>
> CC: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
> CC: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
> CC: Steven Rostedt <rostedt@xxxxxxxxxxx>
> CC: Ben Segall <bsegall@xxxxxxxxxx>
> CC: Mel Gorman <mgorman@xxxxxxx>
> CC: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
> CC: Valentin Schneider <vschneid@xxxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: linux-ia64@xxxxxxxxxxxxxxx
> CC: linux-kernel@xxxxxxxxxxxxxxx
> CC: linux-mm@xxxxxxxxx
> CC: linux-fsdevel@xxxxxxxxxxxxxxx
>
> 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.