From: Jens Axboe <[email protected]>
To: Palash Oswal <[email protected]>, [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 07:37:54 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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.
--
Jens Axboe
next prev parent reply other threads:[~2021-04-27 13:37 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 [this message]
2021-04-27 17:00 ` Pavel Begunkov
2021-04-27 17:00 ` Jens Axboe
2021-04-27 17:04 ` Pavel Begunkov
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