From: ebiederm@xmission.com (Eric W. Biederman)
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
Linux Containers <containers@lists.linux-foundation.org>,
Christof Meerwald <cmeerw@cmeerw.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] signal: Avoid corrupting si_pid and si_uid in do_notify_parent
Date: Tue, 21 Apr 2020 08:42:47 -0500 [thread overview]
Message-ID: <874ktd6jl4.fsf@x220.int.ebiederm.org> (raw)
In-Reply-To: <20200421125908.ls5nwgkl4q7hjoov@wittgenstein> (Christian Brauner's message of "Tue, 21 Apr 2020 14:59:08 +0200")
Christian Brauner <christian.brauner@ubuntu.com> writes:
> On Tue, Apr 21, 2020 at 02:17:22PM +0200, Oleg Nesterov wrote:
>> On 04/21, Christian Brauner wrote:
>> >
>> > process B setnses into
>> > <pidnsC> which is a sibling pid namespace,
>>
>> please see pidns_install(), it verifies that
>>
>> * Only allow entering the current active pid namespace
>> * or a child of the current active pid namespace.
>
> I forgot about that.
>
> Though, don't we have the same problem in:
>
> static void do_notify_parent_cldstop(struct task_struct *tsk,
> bool for_ptracer, int why)
>
> at least for the for_ptrace is false case?
The same problem does not exist with do_notify_parent_cldstop because
do_notify_parent_cldstop is always called from current (there is
one case of current->group_leader but that is close enough calculations
made against current are true).
However because do_notify_parent_cldstop calculates si_pid and si_uid of
the target parent process I think we can still get the wrong si_uid.
So it probably makes sense to generalize the fixup code in send_signal
and make do_notify_parent_cldstop just generate ids in the current
namespace and let the fixup code do it's job.
Eric
next prev parent reply other threads:[~2020-04-21 13:45 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 [this message]
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 ` SIGCHLD signal sometimes sent with si_pid==0 (Linux 5.6.5) Eric W. Biederman
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