linux-kernel - Re: net/rds: use-after-free in inet

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Message-ID: <CACT4Y+YFMORo6YJBG_wOCFPK4dHHzQ_fBp650-E3REH8SdwpAQ@mail.gmail.com>
Date:   Tue, 28 Feb 2017 18:45:42 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Sowmini Varadhan <sowmini.varadhan@...cle.com>
Cc:     santosh.shilimkar@...cle.com, David Miller <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>, linux-rdma@...r.kernel.org,
        rds-devel@....oracle.com, LKML <linux-kernel@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/rds: use-after-free in inet_create

On Tue, Feb 28, 2017 at 6:33 PM, Sowmini Varadhan
<sowmini.varadhan@...cle.com> wrote:
> On (02/28/17 17:51), Dmitry Vyukov wrote:
>> Searching other crashes for "net/rds" I found 2 more crashes that may
>> be related. They suggest that the delayed works are not properly
>> stopped when the socket is destroyed. That would explain how
>> rds_connect_worker accesses freed net, right?
>
> yes, I think we may want to explicitly cancel this workq.. this
> in rds_conn_destroy().
>
> I'm trying to build/sanity-test (if lucky, reproduce the bug)
> as I send this out.. let me get back to you..
>
> If I have a patch against net-next, would you be willing/able to
> try it out? given that this does not show up on demand, I'm not
> sure how we can check that "the fix worked"..


Yes, I can now apply custom patches to the bots. However, it fired
only 3 times, so it will give weak signal. But at least it will test
that the patch does not cause other bad things.