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

[Kees Cook]

On Thu, Jun 5, 2014 at 6:40 AM, David Drysdale <drysdale@xxxxxxxxxx> 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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