linux-kernel - Re: [PATCH linux-next] mqueue: fix IPC namespace use-after-free

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Date:   Tue, 19 Dec 2017 18:02:56 +0100
From:   Giuseppe Scrivano <gscrivan@...hat.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, alexander.deucher@....com,
        Mark Brown <broonie@...nel.org>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        David Miller <davem@...emloft.net>, deepa.kernel@...il.com,
        Greg KH <gregkh@...uxfoundation.org>,
        luc.vanoostenryck@...il.com, lucien xin <lucien.xin@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Neil Horman <nhorman@...driver.com>,
        syzkaller-bugs@...glegroups.com,
        Vladislav Yasevich <vyasevich@...il.com>
Subject: Re: [PATCH linux-next] mqueue: fix IPC namespace use-after-free

Dmitry Vyukov <dvyukov@...gle.com> writes:

>> Unrelated issue, but register_filesystem() should be the last thing
>> module_init() of a filesystem driver does.  It's a separate story,
>> in any case...
>
> Giuseppe, what report is this?
> If there is a reproducer, you can ask syzbot to test a patch.

I have tried locally the reproducer and the issue seems fixed both in
Al's patch and in my version.

In any case, the original issue was:

https://groups.google.com/forum/#!msg/syzkaller-bugs/1XBaqnPSXzs/VF-eCSPuCQAJ

Thanks,
Giuseppe