From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, Palash Oswal <[email protected]>
Cc: [email protected], [email protected],
[email protected], [email protected],
[email protected],
[email protected], [email protected]
Subject: Re: [PATCH 5.13] io_uring: Check current->io_uring in io_uring_cancel_sqpoll
Date: Tue, 27 Apr 2021 18:04:11 +0100 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
On 4/27/21 6:00 PM, Jens Axboe wrote:
> On 4/27/21 11:00 AM, Pavel Begunkov wrote:
>> On 4/27/21 2:37 PM, Jens Axboe wrote:
>>> On 4/27/21 6:51 AM, Palash Oswal wrote:
>>>> syzkaller identified KASAN: null-ptr-deref Write in
>>>> io_uring_cancel_sqpoll on v5.12
>>>>
>>>> io_uring_cancel_sqpoll is called by io_sq_thread before calling
>>>> io_uring_alloc_task_context. This leads to current->io_uring being
>>>> NULL. io_uring_cancel_sqpoll should not have to deal with threads
>>>> where current->io_uring is NULL.
>>>>
>>>> In order to cast a wider safety net, perform input sanitisation
>>>> directly in io_uring_cancel_sqpoll and return for NULL value of
>>>> current->io_uring.
>>>
>>> Thanks applied - I augmented the commit message a bit.
>>
>> btw, does it fixes the replied before syz report? Should
>> syz fix or tag it if so.
>> Reported-by: [email protected]
>
> That tag was already there.
Oh, right, missed it
--
Pavel Begunkov
prev parent reply other threads:[~2021-04-27 17:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-26 9:33 KASAN: null-ptr-deref Write in io_uring_cancel_sqpoll syzbot
[not found] ` <[email protected]>
2021-04-27 6:29 ` Dmitry Vyukov
2021-04-27 7:05 ` Palash Oswal
2021-04-27 8:37 ` Pavel Begunkov
2021-04-27 10:39 ` Palash Oswal
2021-04-27 11:20 ` Pavel Begunkov
2021-04-27 12:51 ` [PATCH 5.13] io_uring: Check current->io_uring " Palash Oswal
2021-04-27 13:08 ` Pavel Begunkov
2021-04-27 13:37 ` Jens Axboe
2021-04-27 17:00 ` Pavel Begunkov
2021-04-27 17:00 ` Jens Axboe
2021-04-27 17:04 ` Pavel Begunkov [this message]
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