Re: linux-stable-5.10-y CVE-2022-1508 of io_uring module

[Jens Axboe]

On 5/6/22 9:57 AM, Pavel Begunkov wrote:
> On 5/6/22 03:16, Jens Axboe wrote:
>> On 5/5/22 8:11 AM, Guo Xuenan wrote:
>>> Hi, Pavel & Jens
>>>
>>> CVE-2022-1508[1] contains an patch[2] of io_uring. As Jones reported,
>>> it is not enough only apply [2] to stable-5.10.
>>> Io_uring is very valuable and active module of linux kernel.
>>> I've tried to apply these two patches[3] [4] to my local 5.10 code, I
>>> found my understanding of io_uring is not enough to resolve all conflicts.
>>>
>>> Since 5.10 is an important stable branch of linux, we would appreciate
>>> your help in solving this problem.
>>
>> Yes, this really needs to get buttoned up for 5.10. I seem to recall
>> there was a reproducer for this that was somewhat saner than the
>> syzbot one (which doesn't do anything for me). Pavel, do you have one?
> 
> No, it was the only repro and was triggering the problem
> just fine back then

I modified it a bit and I can now trigger it.

-- 
Jens Axboe