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From: "Mickaël Salaün" <mic@digikod.net>
To: Jann Horn <jann@thejh.net>
Cc: linux-kernel@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Daniel Mack <daniel@zonque.org>,
	David Drysdale <drysdale@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	"Eric W . Biederman" <ebiederm@xmission.com>,
	James Morris <james.l.morris@oracle.com>,
	Kees Cook <keescook@chromium.org>, Paul Moore <pmoore@redhat.com>,
	Sargun Dhillon <sargun@sargun.me>,
	"Serge E . Hallyn" <serge@hallyn.com>, Tejun Heo <tj@kernel.org>,
	Thomas Graf <tgraf@suug.ch>, Will Drewry <wad@chromium.org>,
	kernel-hardening@lists.openwall.com, linux-api@vger.kernel.org,
	linux-security-module@vger.kernel.org, netdev@vger.kernel.org,
	cgroups@vger.kernel.org
Subject: Re: [RFC v4 00/18] Landlock LSM: Unprivileged sandboxing
Date: Wed, 26 Oct 2016 19:24:31 +0200
Message-ID: <5810E6CF.1080406@digikod.net> (raw)
In-Reply-To: <5810E04D.9020300@digikod.net>

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On 26/10/2016 18:56, Mickaël Salaün wrote:
> 
> On 26/10/2016 16:52, Jann Horn wrote:
>> On Wed, Oct 26, 2016 at 08:56:36AM +0200, Mickaël Salaün wrote:
>>> The loaded Landlock eBPF programs can be triggered by a seccomp filter
>>> returning RET_LANDLOCK. In addition, a cookie (16-bit value) can be passed from
>>> a seccomp filter to eBPF programs. This allow flexible security policies
>>> between seccomp and Landlock.
>>
>> Is this still up to date, or was that removed in v3?
>>
> 
> I forgot to remove this part. In this v4 series, as describe in the
> (small) patch 11/18, a Landlock rule cannot be triggered by a seccomp
> filter. So there is no more RET_LANDLOCK nor cookie.
> 

Here is an up-to-date version:

# Use case scenario

First, a process needs to create a new dedicated eBPF map containing handles.
This handles are references to system resources (e.g. file or directory). They
are grouped in one or multiple maps to be efficiently managed and checked in
batches. This kind of map can be passed to Landlock eBPF functions to compare,
for example, with a file access request.

First, a task need to create or receive a Landlock rule. This rule is a
dedicated eBPF program tied to one of the Landlock hooks, which are a subset of
LSM hooks. Once loaded, a Landlock rule can be enforced through the seccomp(2)
syscall for the current thread and its (future) children, like a seccomp
filter.

Another way to enforce a Landlock security policy is to attach Landlock rules
to a cgroup. All the processes in this cgroup will then be subject to this
policy.

A triggered Landlock eBPF program can allow or deny an access, according to
its subtype (i.e. LSM hook), thanks to errno return values.



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  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-26  6:56 Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 01/18] landlock: Add Kconfig Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 02/18] bpf: Move u64_to_ptr() to BPF headers and inline it Mickaël Salaün
2016-10-26  7:19   ` Arnd Bergmann
2016-10-26 13:52     ` [kernel-hardening] " David Sterba
2016-10-26  6:56 ` [RFC v4 03/18] bpf,landlock: Add a new arraymap type to deal with (Landlock) handles Mickaël Salaün
2016-10-26 19:01   ` [kernel-hardening] " Jann Horn
2016-10-26 20:03     ` Mickaël Salaün
2016-10-26 20:16       ` Jann Horn
2016-10-26  6:56 ` [RFC v4 04/18] bpf,landlock: Add eBPF program subtype and is_valid_subtype() verifier Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 05/18] bpf,landlock: Define an eBPF program type for Landlock Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 06/18] fs: Constify path_is_under()'s arguments Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 07/18] landlock: Add LSM hooks Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 08/18] landlock: Handle file comparisons Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 09/18] landlock: Add manager functions Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 10/18] seccomp: Split put_seccomp_filter() with put_seccomp() Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 11/18] seccomp,landlock: Handle Landlock hooks per process hierarchy Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 12/18] bpf: Cosmetic change for bpf_prog_attach() Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 13/18] bpf/cgroup: Replace struct bpf_prog with struct bpf_object Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 14/18] bpf/cgroup: Make cgroup_bpf_update() return an error code Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 15/18] bpf/cgroup: Move capability check Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 16/18] bpf/cgroup,landlock: Handle Landlock hooks per cgroup Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 17/18] landlock: Add update and debug access flags Mickaël Salaün
2016-10-26  6:56 ` [RFC v4 18/18] samples/landlock: Add sandbox example Mickaël Salaün
2016-10-26 14:52 ` [RFC v4 00/18] Landlock LSM: Unprivileged sandboxing Jann Horn
2016-10-26 16:56   ` Mickaël Salaün
2016-10-26 17:24     ` Mickaël Salaün [this message]
2016-11-13 14:23 ` Mickaël Salaün
2016-11-14 10:35   ` Sargun Dhillon
2016-11-14 20:51     ` Mickaël Salaün
2016-11-13 17:38 Alexei Starovoitov

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