linux-kernel - Re: [PATCHv4 RESEND 0/3] syscalls,x86: Add execveat() system call

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Date:	Thu, 5 Jun 2014 10:14:52 -0700
From:	Kees Cook <keescook@...omium.org>
To:	David Drysdale <drysdale@...gle.com>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Meredydd Luff <meredydd@...atehouse.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	"x86@...nel.org" <x86@...nel.org>, linux-arch@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCHv4 RESEND 0/3] syscalls,x86: Add execveat() system call

On Thu, Jun 5, 2014 at 6:40 AM, David Drysdale <drysdale@...gle.com> wrote:
> Resending, adding cc:linux-api.
>
> Also, it may help to add a little more background -- this patch is
> needed as a (small) part of implementing Capsicum in the Linux kernel.
>
> Capsicum is a security framework that has been present in FreeBSD since
> version 9.0 (Jan 2012), and is based on concepts from object-capability
> security [1].
>
> One of the features of Capsicum is capability mode, which locks down
> access to global namespaces such as the filesystem hierarchy.  In
> capability mode, /proc is thus inaccessible and so fexecve(3) doesn't
> work -- hence the need for a kernel-space alternative.
>
> [1] http://www.cl.cam.ac.uk/research/security/capsicum/papers/2010usenix-security-capsicum-website.pdf

Thanks for reposting!

I think it'd be quite helpful to have this available for very tightly
confined sandboxes. And in a larger sense, Capsicum itself is an
interesting way to do programmatic isolation.

-Kees

-- 
Kees Cook
Chrome OS Security
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