linux-kernel - Re: [PATCH] io_uring: fix mm use with IORING_OP

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Message-ID: <d9a15d32-a20b-a20f-9ea4-3ac355c15bb2@gmail.com>
Date:   Wed, 5 Feb 2020 19:02:49 +0300
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] io_uring: fix mm use with IORING_OP_{READ,WRITE}

On 05/02/2020 18:54, Jens Axboe wrote:
> On 2/5/20 8:46 AM, Pavel Begunkov wrote:
>> IORING_OP_{READ,WRITE} need mm to access user buffers, hence
>> req->has_user check should go for them as well. Move the corresponding
>> imports past the check.
> 
> I'd need to double check, but I think the has_user check should just go.
> The import checks for access anyway, so we'll -EFAULT there if we
> somehow messed up and didn't acquire the right mm.
> 
It'd be even better. I have plans to remove it, but I was thinking from a
different angle.

-- 
Pavel Begunkov



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