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

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Message-ID: <20140708125138.GA4749@infradead.org>
Date:	Tue, 8 Jul 2014 05:51:38 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Meredydd Luff <meredydd@...atehouse.org>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Andy Lutomirski <luto@...capital.net>,
	David Drysdale <drysdale@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	LSM List <linux-security-module@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	James Morris <james.l.morris@...cle.com>,
	Kees Cook <keescook@...omium.org>,
	Linux API <linux-api@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-man@...r.kernel.org
Subject: Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)

On Tue, Jul 08, 2014 at 01:48:27PM +0100, Meredydd Luff wrote:
> How would that work? The directory beneath which openat is looking is
> conveyed in the dfd argument itself. If I'm understanding this right,
> you'd have to pass a different value for "open relative to fd#5" and
> "open relative to fd#5, but beneath it only", which doesn't sound
> hugely elegant to me.

Yeah, it won't work for an explicit directory - I was thinking of
working relative to $CWD.

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