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

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Message-ID: <20191230150424.GB70684@google.com>
Date:   Mon, 30 Dec 2019 16:04:24 +0100
From:   KP Singh <kpsingh@...omium.org>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     KP Singh <kpsingh@...omium.org>,
        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>,
        James Morris <jmorris@...ei.org>,
        Kees Cook <keescook@...omium.org>,
        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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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>
Subject: Re: [PATCH bpf-next v1 00/13] MAC and Audit policy using eBPF (KRSI)

On 23-Dec 22:51, Andrii Nakryiko wrote:
> On Fri, Dec 20, 2019 at 7:42 AM KP Singh <kpsingh@...omium.org> wrote:
> >
> > From: KP Singh <kpsingh@...gle.com>
> >
> > This patch series is a continuation of the KRSI RFC
> > (https://lore.kernel.org/bpf/20190910115527.5235-1-kpsingh@chromium.org/)
> >
> 
> [...]
> 
> > # Usage Examples
> >
> > A simple example and some documentation is included in the patchset.
> >
> > In order to better illustrate the capabilities of the framework some
> > more advanced prototype code has also been published separately:
> >
> > * Logging execution events (including environment variables and arguments):
> > https://github.com/sinkap/linux-krsi/blob/patch/v1/examples/samples/bpf/lsm_audit_env.c
> > * Detecting deletion of running executables:
> > https://github.com/sinkap/linux-krsi/blob/patch/v1/examples/samples/bpf/lsm_detect_exec_unlink.c
> > * Detection of writes to /proc/<pid>/mem:
> > https://github.com/sinkap/linux-krsi/blob/patch/v1/examples/samples/bpf/lsm_audit_env.c
> 
> Are you planning on submitting these examples for inclusion into
> samples/bpf or selftests/bpf? It would be great to have more examples
> and we can review and suggest nicer ways to go about writing them
> (e.g., BPF skeleton and global data Alexei mentioned earlier).

Eventually, yes and in selftest/bpf.

But these examples depend on using security blobs and some non-atomic
calls in the BPF helpers which are not handled as a part of the
initial patch-set.

Once we have the initial framework finalized, I will update the
examples and the helpers they are based on and send these separate
patch-sets on the list for review.

- KP

> 
> >
> > We have updated Google's internal telemetry infrastructure and have
> > started deploying this LSM on our Linux Workstations. This gives us more
> > confidence in the real-world applications of such a system.
> >
> > KP Singh (13):
> >   bpf: Refactor BPF_EVENT context macros to its own header.
> >   bpf: lsm: Add a skeleton and config options
> >   bpf: lsm: Introduce types for eBPF based LSM
> >   bpf: lsm: Allow btf_id based attachment for LSM hooks
> >   tools/libbpf: Add support in libbpf for BPF_PROG_TYPE_LSM
> >   bpf: lsm: Init Hooks and create files in securityfs
> >   bpf: lsm: Implement attach, detach and execution.
> >   bpf: lsm: Show attached program names in hook read handler.
> >   bpf: lsm: Add a helper function bpf_lsm_event_output
> >   bpf: lsm: Handle attachment of the same program
> >   tools/libbpf: Add bpf_program__attach_lsm
> >   bpf: lsm: Add selftests for BPF_PROG_TYPE_LSM
> >   bpf: lsm: Add Documentation
> >
> 
> [...]