From: Giuseppe Scrivano <gscrivan@redhat.com>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, alexander.deucher@amd.com,
        Mark Brown <broonie@kernel.org>,
        Chris Wilson <chris@chris-wilson.co.uk>,
        David Miller <davem@davemloft.net>, deepa.kernel@gmail.com,
        Greg KH <gregkh@linuxfoundation.org>, luc.vanoostenryck@gmail.com,
        lucien xin <lucien.xin@gmail.com>, Ingo Molnar <mingo@kernel.org>,
        Neil Horman <nhorman@tuxdriver.com>, syzkaller-bugs@googlegroups.com,
        Vladislav Yasevich <vyasevich@gmail.com>
Subject: Re: [PATCH linux-next] mqueue: fix IPC namespace use-after-free
References: <20171219101440.19736-1-gscrivan@redhat.com>
        <20171219114819.GQ21978@ZenIV.linux.org.uk>
        <20171219153225.GA14771@ZenIV.linux.org.uk>
        <20171219154400.GS21978@ZenIV.linux.org.uk>
        <CACT4Y+b6=5zJX-N6byM-xBr75Pn8wr556jtBjtMsi88NQ8pFiQ@mail.gmail.com>
Date: Tue, 19 Dec 2017 18:02:56 +0100
In-Reply-To: <CACT4Y+b6=5zJX-N6byM-xBr75Pn8wr556jtBjtMsi88NQ8pFiQ@mail.gmail.com>
        (Dmitry Vyukov's message of "Tue, 19 Dec 2017 17:31:48 +0100")
Message-ID: <87zi6efy67.fsf@redhat.com>
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Dmitry Vyukov <dvyukov@google.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