linux-kernel - Re: [PATCH v2] block: silently forbid sending any ioctl to a partition

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Date:   Wed, 10 Jan 2018 08:54:33 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>, hch@...radead.org
Subject: Re: [PATCH v2] block: silently forbid sending any ioctl to a
 partition

On Wed, Jan 10, 2018 at 04:54:52PM +0100, Paolo Bonzini wrote:
> After the first few months, the message has not led to many bug reports.
> It's been almost five years now, and in practice the main source of
> it seems to be MTIOCGET that someone is using to detect tape devices.
> While we could whitelist it just like CDROM_GET_CAPABILITY, this patch
> just removes the message altogether.
> 
> The patch also removes the "safe but not very useful" ioctl whitelist,
> as suggested by Christoph.  I doubt anything is using most of those
> ioctls _in general_, let alone on a partition.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>

Nice, thanks!

Reviewed-by: Christoph Hellwig <hch@....de>