linux-kernel - Re: [PATCH v2 1/1] prctl: add PR_{GET,SET}_KILL_DESCENDANTS_ON

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Message-ID: <20181130112233.GC23670@redhat.com>
Date:   Fri, 30 Nov 2018 12:22:33 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Jürg Billeter <j@...ron.ch>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...nel.org>, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] prctl: add PR_{GET,SET}_KILL_DESCENDANTS_ON_EXIT

On 11/30, Jürg Billeter wrote:
>
> This introduces a new thread group flag that can be set by calling
>
>     prctl(PR_SET_KILL_DESCENDANTS_ON_EXIT, 1, 0, 0, 0)
>
> When a thread group exits with this flag set, it will send SIGKILL to
> all descendant processes.  This can be used to prevent stray child
> processes.

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