linux-kernel - Re: [PATCH v7 1/1] ptrace,syscall_user_dispatch: checkpoint/restore support for SUD

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Message-ID: <20230126191515.GE4069@redhat.com>
Date:   Thu, 26 Jan 2023 20:15:15 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Gregory Price <gourry.memverge@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        avagin@...il.com, peterz@...radead.org, luto@...nel.org,
        krisman@...labora.com, tglx@...utronix.de, corbet@....net,
        shuah@...nel.org, Gregory Price <gregory.price@...verge.com>
Subject: Re: [PATCH v7 1/1] ptrace,syscall_user_dispatch: checkpoint/restore
 support for SUD

On 01/26, Gregory Price wrote:
>
> Implement ptrace getter/setter interface for syscall user dispatch.
>
> These prctl settings are presently write-only, making it impossible to
> implement transparent checkpoint/restore via software like CRIU.
>
> 'on_dispatch' field is not exposed because it is a kernel-internal
> only field that cannot be 'true' when returning to userland.
>
> Signed-off-by: Gregory Price <gregory.price@...verge.com>
> ---
>  .../admin-guide/syscall-user-dispatch.rst     |  5 ++-
>  include/linux/syscall_user_dispatch.h         | 18 +++++++++
>  include/uapi/linux/ptrace.h                   |  9 +++++
>  kernel/entry/syscall_user_dispatch.c          | 39 +++++++++++++++++++
>  kernel/ptrace.c                               |  9 +++++
>  5 files changed, 79 insertions(+), 1 deletion(-)

Reviewed-by: Oleg Nesterov <oleg@...hat.com>