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

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Message-ID: <CALCETrUXgkiNf+pCKL5dyAFRbm4dF4R-E=qf6CzpV5pnsdrBkQ@mail.gmail.com>
Date:	Mon, 30 Jun 2014 14:11:49 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	David Drysdale <drysdale@...gle.com>,
	LSM List <linux-security-module@...r.kernel.org>,
	"linux-kernel@...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 <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 1:40 PM, Andi Kleen <andi@...stfloor.org> wrote:
> David Drysdale <drysdale@...gle.com> writes:
>
>> 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 about bind mounts?

What's the problematic scenario?

--Andy
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