linux-kernel - Re: [PATCH bpf-next v1 00/13] MAC and Audit policy using eBPF (KRSI)

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Date:   Thu, 9 Jan 2020 19:23:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     James Morris <jmorris@...ei.org>
Cc:     Stephen Smalley <sds@...ho.nsa.gov>,
        Kees Cook <keescook@...omium.org>,
        KP Singh <kpsingh@...omium.org>,
        Casey Schaufler <casey@...aufler-ca.com>,
        open list <linux-kernel@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, linux-security-module@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Thomas Garnier <thgarnie@...omium.org>,
        Michael Halcrow <mhalcrow@...gle.com>,
        Paul Turner <pjt@...gle.com>,
        Brendan Gregg <brendan.d.gregg@...il.com>,
        Jann Horn <jannh@...gle.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Christian Brauner <christian@...uner.io>,
        Mickaël Salaün <mic@...ikod.net>,
        Florent Revest <revest@...omium.org>,
        Brendan Jackman <jackmanb@...omium.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Andrey Ignatov <rdna@...com>, Joe Stringer <joe@...d.net.nz>,
        Paul Moore <paul@...l-moore.com>
Subject: Re: [PATCH bpf-next v1 00/13] MAC and Audit policy using eBPF (KRSI)

On Fri, Jan 10, 2020 at 05:11:38AM +1100, James Morris wrote:
> On Wed, 8 Jan 2020, Stephen Smalley wrote:
> 
> > The cover letter subject line and the Kconfig help text refer to it as a
> > BPF-based "MAC and Audit policy".  It has an enforce config option that
> > enables the bpf programs to deny access, providing access control. IIRC, in
> > the earlier discussion threads, the BPF maintainers suggested that Smack and
> > other LSMs could be entirely re-implemented via it in the future, and that
> > such an implementation would be more optimal.
> 
> In this case, the eBPF code is similar to a kernel module, rather than a 
> loadable policy file.  It's a loadable mechanism, rather than a policy, in 
> my view.
> 
> This would be similar to the difference between iptables rules and 
> loadable eBPF networking code.  I'd be interested to know how the 
> eBPF networking scenarios are handled wrt kernel ABI.

I already know of some people who pre-compile ebpf programs based on a
number of "supported" kernel versions and then load the needed one at
runtime.

Messy, yes, but you are right, ebpf code is much more similiar to a
kernel module than userspace code at the moment.

thanks,

greg k-h