linux-kernel - Re: KASAN: use-after-free Read in rds_find

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Date:   Wed, 14 Feb 2018 09:58:53 -0800
From:   Santosh Shilimkar <santosh.shilimkar@...cle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+93a5839deb355537440f@...kaller.appspotmail.com>,
        linux-rdma@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, rds-devel@....oracle.com
Subject: Re: KASAN: use-after-free Read in rds_find_bound

On 2/14/2018 9:52 AM, Dmitry Vyukov wrote:
> On Wed, Feb 14, 2018 at 6:35 PM, Santosh Shilimkar
> <santosh.shilimkar@...cle.com> wrote:
>>>>> Hi Santosh,
>>>>>
>>>>> What is that fix? You forgot to provide any link/reference. I also
>>>>> don't see any patches from you at around that date...
>>>>>
>>>> Fix [1] was later not added since there was a still a race. Wanted to
>>>> see if the issue re-appears after recent netns fix [2].
>>>
>>>
>>>
>>> We will not see if the bug re-appears or not until this bug is closed.
>>> Please see this recent discussion about another rds bug:
>>> https://groups.google.com/d/msg/syzkaller-bugs/3XjmOzr5jRU/g7pXIsY1BgAJ
>>> In the current state syzbot will never report bugs in these functions
>>> again.
>>>
>> OK. Can you close that one then in that case ?
> 
> Anybody can do this:
>
I see.

> #syz fix: rds: tcp: use rds_destroy_pending() to synchronize
> netns/module teardown and rds connection/workq management
> 
> syzbot provides full self-service, see first email and in particular this:
> https://github.com/google/syzkaller/blob/master/docs/syzbot.md#communication-with-syzbot
> 
ok will have a look.

Regards,
Santosh