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Date:   Thu, 21 Apr 2022 12:02:25 +0200
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Khazhismel Kumykov <khazhy@google.com>
Cc:     stable@vger.kernel.org, Bart Van Assche <bvanassche@acm.org>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH] block/compat_ioctl: fix range check in BLKGETSIZE
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References: <20220419191239.588421-1-khazhy@google.com>
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On Tue, Apr 19, 2022 at 12:12:39PM -0700, Khazhismel Kumykov wrote:
> [ Upstream commit ccf16413e520164eb718cf8b22a30438da80ff23 ]
> 
> kernel ulong and compat_ulong_t may not be same width. Use type directly
> to eliminate mismatches.
> 
> This would result in truncation rather than EFBIG for 32bit mode for
> large disks.
> 
> Reviewed-by: Bart Van Assche <bvanassche@acm.org>
> Signed-off-by: Khazhismel Kumykov <khazhy@google.com>
> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
> Link: https://lore.kernel.org/r/20220414224056.2875681-1-khazhy@google.com
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> [compat_ioctl is it's own file in 5.4-stable and earlier]
> ---
> 
> The original commit should apply to the newer stables

It does not, it only applied to 5.17.y.

Please provide working backports for all of the others.

> this should apply
> to all the older stables.

I'll wait for the 5.10.y and 5.15.y backport first before applying this
one.

thanks,

greg k-h