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From: ebiederm@xmission.com (Eric W. Biederman)
To: Christof Meerwald <cmeerw@cmeerw.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: SIGCHLD signal sometimes sent with si_pid==0 (Linux 5.6.5)
Date: Tue, 21 Apr 2020 09:59:39 -0500	[thread overview]
Message-ID: <87v9ls51gk.fsf@x220.int.ebiederm.org> (raw)
In-Reply-To: <20200419201336.GI22017@edge.cmeerw.net> (Christof Meerwald's message of "Sun, 19 Apr 2020 22:13:36 +0200")

Christof Meerwald <cmeerw@cmeerw.org> writes:

> Hi,
>
> this is probably related to commit
> 7a0cf094944e2540758b7f957eb6846d5126f535 (signal: Correct namespace
> fixups of si_pid and si_uid).
>
> With a 5.6.5 kernel I am seeing SIGCHLD signals that don't include a
> properly set si_pid field - this seems to happen for multi-threaded
> child processes.

Christof I want to say very good spotting and reporting of this issue.

Thank you.
Eric

      parent reply	other threads:[~2020-04-21 15:02 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-19 20:13 SIGCHLD signal sometimes sent with si_pid==0 (Linux 5.6.5) Christof Meerwald
2020-04-20 17:05 ` [PATCH] signal: Avoid corrupting si_pid and si_uid in do_notify_parent Eric W. Biederman
2020-04-21  8:30   ` Christian Brauner
2020-04-21  9:28     ` Oleg Nesterov
2020-04-21 10:21       ` Christian Brauner
2020-04-21 11:11         ` Oleg Nesterov
2020-04-21 11:26           ` Christian Brauner
2020-04-21 12:17             ` Oleg Nesterov
2020-04-21 12:59               ` Christian Brauner
2020-04-21 13:42                 ` Eric W. Biederman
2020-04-21 11:28           ` Oleg Nesterov
2020-04-21 11:38             ` Christian Brauner
2020-04-21 10:28     ` Christian Brauner
2020-04-21 14:57     ` Eric W. Biederman
2020-04-21 15:08       ` Christian Brauner
2020-04-21  9:04   ` Oleg Nesterov
2020-04-21 10:19     ` [PATCH] remove the no longer needed pid_alive() check in __task_pid_nr_ns() Oleg Nesterov
2020-04-21 10:50       ` Christian Brauner
2020-04-21 15:05       ` Eric W. Biederman
2020-04-24 18:05         ` Oleg Nesterov
2020-04-24 19:54           ` Eric W. Biederman
2020-04-21 14:59 ` Eric W. Biederman [this message]

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