linux-kernel - Re: [RFC PATCH V3 1/1] block: reject I/O for same fd if block size changed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210104171141.GB27235@lst.de>
Date:   Mon, 4 Jan 2021 18:11:41 +0100
From:   Christoph Hellwig <hch@....de>
To:     Minwoo Im <minwoo.im.dev@...il.com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>,
        Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
Subject: Re: [RFC PATCH V3 1/1] block: reject I/O for same fd if block size
 changed

On Mon, Jan 04, 2021 at 06:11:08PM +0100, Christoph Hellwig wrote:
> On Mon, Jan 04, 2021 at 10:06:59PM +0900, Minwoo Im wrote:
> > +	if (q->backing_dev_info && q->backing_dev_info->owner &&
> > +			limits->logical_block_size != size) {
> > +		bdev = blkdev_get_no_open(q->backing_dev_info->owner->devt);
> > +		bdev->bd_disk->flags |= GENHD_FL_BLOCK_SIZE_CHANGED;
> > +		blkdev_put_no_open(bdev);
> > +	}
> 
> We really need the backpointer from the queue to the gendisk I've wanted
> to add for a while.  Can we at least restrict this to a live gendisk?

Alternatively we could make this request_queue QUEUE* flag for now.