linux-kernel - Re: [PATCH] signal: Avoid corrupting si_pid and si_uid in do_notify

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Message-ID: <20200421121722.GE6787@redhat.com>
Date:   Tue, 21 Apr 2020 14:17:22 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Linux Containers <containers@...ts.linux-foundation.org>,
        Christof Meerwald <cmeerw@...erw.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] signal: Avoid corrupting si_pid and si_uid in
 do_notify_parent

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.

Oleg.