Re: 回复: [PATCH] io-wq: Fix UAF when wakeup wqe in hash waitqueue

From: Pavel Begunkov
Date: Mon May 24 2021 - 06:19:11 EST

On 5/24/21 10:19 AM, Zhang, Qiang wrote:
> On Mon, 24 May 2021 15:18:44 +0800
>> From: Zqiang <qiang.zhang@xxxxxxxxxxxxx>
>> The syzbot report a UAF when iou-wrk accessing wqe of the hash
>> waitqueue. in the case of sharing a hash waitqueue between two
>> io-wq, when one of the io-wq is destroyed, all iou-wrk in this
>> io-wq are awakened, all wqe belonging to this io-wq are removed
>> from hash waitqueue, after that, all iou-wrk belonging to this
>> io-wq begin running, suppose following scenarios, wqe[0] and wqe[1]
>> belong to this io-wq, and these work has same hash value.

Zhang, btw check your mail encoding, should some plain unicode

Pavel Begunkov