From: Florian Weimer <fweimer@redhat.com>
To: "Jürg Billeter" <j@bitron.ch>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Eric Biederman <ebiederm@xmission.com>,
Kees Cook <keescook@chromium.org>,
Andy Lutomirski <luto@kernel.org>,
linux-api@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/1] prctl: add PR_{GET,SET}_KILL_DESCENDANTS_ON_EXIT
Date: Fri, 30 Nov 2018 14:40:14 +0100 [thread overview]
Message-ID: <87bm66u1j5.fsf@oldenburg.str.redhat.com> (raw)
In-Reply-To: <20181130080004.23635-2-j@bitron.ch> (=?utf-8?Q?=22J=C3=BCrg?= Billeter"'s message of "Fri, 30 Nov 2018 08:00:04 +0000")
* Jürg Billeter:
> 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.
>
> This flag is cleared on privilege gaining execve(2) to ensure an
> unprivileged process cannot get a privileged process to send SIGKILL.
So this is inherited across regular execve? I'm not sure that's a good
idea.
> Descendants that are orphaned and reparented to an ancestor of the
> current process before the current process exits, will not be killed.
> PR_SET_CHILD_SUBREAPER can be used to contain orphaned processes.
For double- or triple-forking daemons, the reparenting will be racy, if
I understand things correctly.
Thanks,
Florian
next prev parent reply other threads:[~2018-11-30 13:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-27 22:54 [PATCH 0/1] Add prctl to kill descendants on exit Jürg Billeter
2018-11-27 22:54 ` [PATCH] prctl: add PR_{GET,SET}_KILL_DESCENDANTS_ON_EXIT Jürg Billeter
2018-11-28 14:42 ` Oleg Nesterov
2018-11-28 15:23 ` Eric W. Biederman
2018-11-29 12:34 ` Oleg Nesterov
2018-11-29 15:41 ` Jürg Billeter
2018-11-30 10:33 ` Oleg Nesterov
2018-12-01 4:28 ` Kees Cook
2018-11-30 8:00 ` [PATCH v2 0/1] Add prctl to kill descendants on exit Jürg Billeter
2018-11-30 8:00 ` [PATCH v2 1/1] prctl: add PR_{GET,SET}_KILL_DESCENDANTS_ON_EXIT Jürg Billeter
2018-11-30 11:22 ` Oleg Nesterov
2018-11-30 13:40 ` Florian Weimer [this message]
2018-12-01 10:39 ` Jürg Billeter
2018-12-01 12:28 ` Florian Weimer
2018-12-01 13:57 ` Jürg Billeter
2018-12-06 15:54 ` [PATCH v2 0/1] Add prctl to kill descendants on exit Jürg Billeter
2019-01-18 13:11 ` [RESEND PATCH " Jürg Billeter
2019-01-18 13:11 ` [RESEND PATCH v2 1/1] prctl: add PR_{GET,SET}_KILL_DESCENDANTS_ON_EXIT Jürg Billeter
2019-01-29 1:23 ` Andrew Morton
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