linux-kernel - Re: [PATCH] block: Don't allow illegal discard requests

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: <20151104113019.GA24128@infradead.org>
Date:	Wed, 4 Nov 2015 03:30:19 -0800
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.com>
Cc:	axboe@...nel.dk, LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] block: Don't allow illegal discard requests

On Wed, Nov 04, 2015 at 10:18:41AM +0100, Jan Kara wrote:
> Currently blkdev_issue_discard() doesn't check that submitted discard
> request matches granularity required by the underlying device.
> Submitting such requests to the device can have unexpected consequences
> (e.g. brd driver just discards more / less data depending on how exactly
> the request is aligned). So test that submitted discard request has the
> granularity required by the driver.

How is this going to work with stacked drivers?  I think brd needs to
be fixed to take care of the granularity itself, just like we did for
request based drivers.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/