Re: [PATCH] io_uring: fix mm use with IORING_OP_{READ,WRITE}

[Pavel Begunkov]

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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