linux-kernel - Re: [PATCH v4] fs: allow protected cross-uid sticky symlinks

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Message-ID: <20100603044231.GB4971@outflux.net>
Date:	Wed, 2 Jun 2010 21:42:31 -0700
From:	Kees Cook <kees.cook@...onical.com>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>, Eric Paris <eparis@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	James Morris <jmorris@...ei.org>, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	David Howells <dhowells@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Tim Gardner <tim.gardner@...onical.com>,
	"Serge E. Hallyn" <serue@...ibm.com>
Subject: Re: [PATCH v4] fs: allow protected cross-uid sticky symlinks

On Thu, Jun 03, 2010 at 09:42:21AM +0800, Dave Young wrote:
> On Thu, Jun 3, 2010 at 9:18 AM, Kees Cook <kees.cook@...onical.com> wrote:
> > On Thu, Jun 03, 2010 at 08:51:28AM +0800, Dave Young wrote:
> >> On Thu, Jun 3, 2010 at 6:23 AM, Kees Cook <kees.cook@...onical.com> wrote:
> >> > v2:
> >> >  - moved sysctl extern into security.h.
> >>
> >> Not in v4?
> >>
> >> > v3:
> >> >  - move into VFS core.
> >> >  - rename sysctl, invert logic.
> >
> > Right, as part of the "move out of security/" the sysctl moved to live in
> > fs/namei.c (and therefore needed an extern in kernel/sysctl.c).
> 
> Then linux/fs.h is the place to go
> sysctl_nr_open_min and sysctl_nr_open_max can go there as well.

Okay, I wasn't sure if that was right or not.  I'll do that for v6, and
send the sysctl_nr_open_* in a separate patch.

Thanks!

-Kees

-- 
Kees Cook
Ubuntu Security Team
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