linux-kernel - Re: [PATCH v8 1/1] ptrace,syscall_user_dispatch: checkpoint/restore support for SUD

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Message-ID: <20230131185802.GA7999@redhat.com>
Date:   Tue, 31 Jan 2023 19:58:02 +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 v8 1/1] ptrace,syscall_user_dispatch: checkpoint/restore
 support for SUD

On 01/31, 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>

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