linux-kernel - Re: [PATCH 01/11] fs: add O_BENEATH

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Message-ID: <20140708120331.GA30459@infradead.org>
Date:	Tue, 8 Jul 2014 05:03:31 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	David Drysdale <drysdale@...gle.com>
Cc:	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Meredydd Luff <meredydd@...atehouse.org>,
	Kees Cook <keescook@...omium.org>,
	James Morris <james.l.morris@...cle.com>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)

On Mon, Jun 30, 2014 at 11:28:01AM +0100, David Drysdale wrote:
> Add a new O_BENEATH_ONLY flag for openat(2) which restricts the
> provided path, rejecting (with -EACCES) paths that are not beneath
> the provided dfd.  In particular, reject:
>  - paths that contain .. components
>  - paths that begin with /
>  - symlinks that have paths as above.


How is this implemented in FreeBSD?  I can't find any references to
O_BENEATH_ONLY except for your patchset.
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