linux-kernel - Re: [PATCH v2] kthread: fix use-after-free if kthread fork fails

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Message-ID: <20170510140232.GA7500@redhat.com>
Date:   Wed, 10 May 2017 16:02:33 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Vegard Nossum <vegard.nossum@...cle.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Jamie Iles <jamie.iles@...cle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v2] kthread: fix use-after-free if kthread fork fails

On 05/09, Vegard Nossum wrote:
>
> If a kthread forks (e.g. usermodehelper since commit 1da5c46fa965) but
> fails in copy_process() between calling dup_task_struct() and setting
> p->set_child_tid, then the value of p->set_child_tid will be inherited
> from the parent and get prematurely freed by free_kthread_struct().

Thanks,

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