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Message-ID: <FD5C91B5-8E07-4CB0-A08B-5E0D1E2A3B04@oracle.com>
Date: Tue, 13 Apr 2021 14:09:29 +0000
From: Haakon Bugge <haakon.bugge@...cle.com>
To: Jason Gunthorpe <jgg@...pe.ca>
CC: Hao Sun <sunhao.th@...il.com>,
"dledford@...hat.com" <dledford@...hat.com>,
OFED mailing list <linux-rdma@...r.kernel.org>,
"leon@...nel.org" <leon@...nel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: KASAN: use-after-free Read in cma_cancel_operation, rdma_listen
> On 13 Apr 2021, at 15:44, Jason Gunthorpe <jgg@...pe.ca> wrote:
>
> On Tue, Apr 13, 2021 at 09:42:43PM +0800, Hao Sun wrote:
>> Jason Gunthorpe <jgg@...pe.ca> 于2021年4月13日周二 下午9:34写道:
>>>
>>> On Tue, Apr 13, 2021 at 11:36:41AM +0800, Hao Sun wrote:
>>>> Hi
>>>>
>>>> When using Healer(https://github.com/SunHao-0/healer/tree/dev) to fuzz
>>>> the Linux kernel, I found two use-after-free bugs which have been
>>>> reported a long time ago by Syzbot.
>>>> Although the corresponding patches have been merged into upstream,
>>>> these two bugs can still be triggered easily.
>>>> The original information about Syzbot report can be found here:
>>>> https://syzkaller.appspot.com/bug?id=8dc0bcd9dd6ec915ba10b3354740eb420884acaa
>>>> https://syzkaller.appspot.com/bug?id=95f89b8fb9fdc42e28ad586e657fea074e4e719b
>>>
>>> Then why hasn't syzbot seen this in a year's time? Seems strange
>>>
>>
>> Seems strange to me too, but the fact is that the reproduction program
>> in attachment can trigger these two bugs quickly.
>
> Do you have this in the C format?
How can a commit changing arch m68k provoke a bug when running on x86_64?
Håkon
>
> Jason
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