linux-kernel - Re: Commit d5fd456c88aba4fcf77d35fe38024a8d5c814686 - "loopdev: use LOOP_CONFIG ioctl" broke loop on x86-64 w/ 32 bit userspace

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Date:   Wed, 28 Jul 2021 11:14:05 +0200
From:   Karel Zak <kzak@...hat.com>
To:     Krzysztof Olędzki <ole@....pl>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Sinan Kaya <sinan.kaya@...rosoft.com>,
        util-linux@...r.kernel.org, linux-block@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Commit d5fd456c88aba4fcf77d35fe38024a8d5c814686 - "loopdev: use
 LOOP_CONFIG ioctl" broke loop on x86-64 w/ 32 bit userspace

On Tue, Jul 27, 2021 at 10:46:06PM -0700, Krzysztof Olędzki wrote:
> So, to confirm - checking for both EINVAL and ENOTTY after LOOP_CONFIGURE is
> the proper way of taking care this?
> 
> https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/tree/lib/loopdev.c?id=d4423cce9b9001c9de7ebc6f64f6cc2bb854944c#n1362

We need both to make losetup/mount robust for already released kernels.
Fixed: https://github.com/karelzak/util-linux/commit/583990d25b5d65a9a9771a39d112de0ee16a1f3a

Thanks for your report!

 Karel

-- 
 Karel Zak  <kzak@...hat.com>
 http://karelzak.blogspot.com