linux-kernel - Re: [PATCH 0/3] Add O_DENY* flags to fcntl and cifs

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Message-ID: <20121210164116.GC13327@fieldses.org>
Date:	Mon, 10 Dec 2012 11:41:16 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Pavel Shilovsky <piastry@...rsoft.ru>
Cc:	Christoph Hellwig <hch@...radead.org>, linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	wine-devel@...ehq.org, linux-nfs@...r.kernel.org
Subject: Re: [PATCH 0/3] Add O_DENY* flags to fcntl and cifs

On Sat, Dec 08, 2012 at 12:43:14AM +0400, Pavel Shilovsky wrote:
> The problem is the possibility of denial-of-service attacks here. We
> can try to prevent them by:
> 1) specifying an extra security bit on the file that indicates that
> share flags are accepted (like we have for mandatory locks now) and
> setting it for neccessary files only, or
> 2) adding a special mount option (but it it probably makes sense if
> we decided to add this support for CIFS and NFS only).

In the case of knfsd and samba exporting a common filesystem, you'd also
want to be able to enforce it on the exported filesystem.

--b.
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