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Message-ID: <356ba1b6-7979-a767-2501-0a96b653c860@huawei.com>
Date: Wed, 18 May 2022 08:39:16 +0800
From: QiuLaibin <qiulaibin@...wei.com>
To: Jens Axboe <axboe@...nel.dk>
CC: <tj@...nel.org>, <cgroups@...r.kernel.org>,
<linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Ming Lei <ming.lei@...hat.com>
Subject: Re: [PATCH -next v2] blk-throttle: Set BIO_THROTTLED when bio has
been throttled
friendly ping....
在 2022/3/2 21:51, Ming Lei 写道:
> On Tue, Mar 01, 2022 at 08:39:19PM +0800, Laibin Qiu wrote:
>> 1.In current process, all bio will set the BIO_THROTTLED flag
>> after __blk_throtl_bio().
>>
>> 2.If bio needs to be throttled, it will start the timer and
>> stop submit bio directly. Bio will submit in
>> blk_throtl_dispatch_work_fn() when the timer expires.But in
>> the current process, if bio is throttled. The BIO_THROTTLED
>> will be set to bio after timer start. If the bio has been
>> completed, it may cause use-after-free blow.
>>
>> BUG: KASAN: use-after-free in blk_throtl_bio+0x12f0/0x2c70
>> Read of size 2 at addr ffff88801b8902d4 by task fio/26380
>
> After the queue lock is released, the bio can be dispatched & completed,
> so it shouldn't be touched after lock release:
>
> Reviewed-by: Ming Lei <ming.lei@...hat.com>
>
> Thanks,
> Ming
>
> .
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