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

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Message-ID: <CALCETrU=HLmw9n-DxPkFV1xP5wtzQ7-YF3-uao6YiGZODA9kdw@mail.gmail.com>
Date:	Mon, 30 Jun 2014 07:49:41 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	David Drysdale <drysdale@...gle.com>
Cc:	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>,
	Meredydd Luff <meredydd@...atehouse.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/11] fs: add O_BENEATH_ONLY flag to openat(2)

On Jun 30, 2014 3:36 AM, "David Drysdale" <drysdale@...gle.com> 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.

I like this a lot.  However, I think I'd like it even better if it
were AT_BENEATH_ONLY so that it could be added to the rest of the *at
family.

--Andy
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