linux-kernel - Re: [PATCH] loop: fix to a race condition due to the early registration of device

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Date:   Tue, 8 Aug 2017 15:00:47 -0700
From:   Omar Sandoval <osandov@...ndov.com>
To:     Anton Volkov <avolkov@...ras.ru>
Cc:     tom.leiming@...il.com, axboe@...com, osandov@...com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        ldv-project@...uxtesting.org, khoroshilov@...ras.ru
Subject: Re: [PATCH] loop: fix to a race condition due to the early
 registration of device

On Mon, Aug 07, 2017 at 03:37:50PM +0300, Anton Volkov wrote:
> The early device registration made possible a race leading to allocations
> of disks with wrong minors.
> 
> This patch moves the device registration further down the loop_init
> function to make the race infeasible.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Anton Volkov <avolkov@...ras.ru>
> Reviewed-by: Ming Lei <ming.lei@...hat.com>

Hi, Anton,

Were you able to reproduce this issue or was it purely theoretical? If
the former, it'd be nice if you could add a test case to blktests [1].

1: https://github.com/osandov/blktests

Thanks!
Omar