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

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Date:	Tue, 8 Jul 2014 14:04:45 +0100
From:	Meredydd Luff <meredydd@...atehouse.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	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 <linux-man@...r.kernel.org>
Subject: Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)

On 8 July 2014 13:51, Christoph Hellwig <hch@...radead.org> wrote:
> Yeah, it won't work for an explicit directory - I was thinking of
> working relative to $CWD.

I think that would sacrifice far too much flexibility. Even without
Capsicum, it would be worthwhile to be able to wire up a static
seccomp-bpf filter to enforce constraints such as "you can open files
under fd#5 for reading, but you can only write to files under fd#6,
and you can't do any global lookups."

Meredydd
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