From: Daniel Borkmann <daniel@iogearbox.net>
To: Paul Moore <paul@paul-moore.com>, Christian Brauner <brauner@kernel.org>
Cc: Frederick Lawler <fred@cloudflare.com>,
Casey Schaufler <casey@schaufler-ca.com>,
kpsingh@kernel.org, revest@chromium.org, jackmanb@chromium.org,
ast@kernel.org, andrii@kernel.org, kafai@fb.com,
songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com,
jmorris@namei.org, serge@hallyn.com, bpf@vger.kernel.org,
linux-security-module@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel-team@cloudflare.com
Subject: Re: [PATCH 0/2] Introduce security_create_user_ns()
Date: Tue, 28 Jun 2022 00:15:22 +0200 [thread overview]
Message-ID: <6a8fba0a-c9c9-61ba-793a-c2e0c2924f88@iogearbox.net> (raw)
In-Reply-To: <CAHC9VhSQH9tE-NgU6Q-GLqSy7R6FVjSbp4Tc4gVTbjZCqAWy5Q@mail.gmail.com>
On 6/27/22 11:56 PM, Paul Moore wrote:
> On Mon, Jun 27, 2022 at 8:11 AM Christian Brauner <brauner@kernel.org> wrote:
>> On Thu, Jun 23, 2022 at 11:21:37PM -0400, Paul Moore wrote:
>
> ...
>
>>> This is one of the reasons why I usually like to see at least one LSM
>>> implementation to go along with every new/modified hook. The
>>> implementation forces you to think about what information is necessary
>>> to perform a basic access control decision; sometimes it isn't always
>>> obvious until you have to write the access control :)
>>
>> I spoke to Frederick at length during LSS and as I've been given to
>> understand there's a eBPF program that would immediately use this new
>> hook. Now I don't want to get into the whole "Is the eBPF LSM hook
>> infrastructure an LSM" but I think we can let this count as a legitimate
>> first user of this hook/code.
>
> Yes, for the most part I don't really worry about the "is a BPF LSM a
> LSM?" question, it's generally not important for most discussions.
> However, there is an issue unique to the BPF LSMs which I think is
> relevant here: there is no hook implementation code living under
> security/. While I talked about a hook implementation being helpful
> to verify the hook prototype, it is also helpful in providing an
> in-tree example for other LSMs; unfortunately we don't get that same
> example value when the initial hook implementation is a BPF LSM.
I would argue that such a patch series must come together with a BPF
selftest which then i) contains an in-tree usage example, ii) adds BPF
CI test coverage. Shipping with a BPF selftest at least would be the
usual expectation.
Thanks,
Daniel
next prev parent reply other threads:[~2022-06-27 22:15 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-21 23:39 [PATCH 0/2] Introduce security_create_user_ns() Frederick Lawler
2022-06-21 23:39 ` [PATCH 1/2] security, lsm: " Frederick Lawler
2022-06-21 23:39 ` [PATCH 2/2] bpf-lsm: Make bpf_lsm_create_user_ns() sleepable Frederick Lawler
2022-06-22 0:19 ` [PATCH 0/2] Introduce security_create_user_ns() Casey Schaufler
2022-06-22 14:24 ` Frederick Lawler
2022-06-22 15:26 ` Casey Schaufler
2022-06-22 15:26 ` Casey Schaufler
2022-06-24 3:21 ` Paul Moore
2022-06-27 12:11 ` Christian Brauner
2022-06-27 15:51 ` Frederick Lawler
2022-06-27 15:56 ` Christian Brauner
2022-06-27 17:24 ` Casey Schaufler
2022-06-27 22:13 ` Paul Moore
2022-06-27 21:56 ` Paul Moore
2022-06-27 22:15 ` Daniel Borkmann [this message]
2022-06-27 22:27 ` KP Singh
2022-06-27 22:27 ` Paul Moore
2022-06-27 23:18 ` Casey Schaufler
2022-06-28 15:14 ` Frederick Lawler
2022-06-28 16:02 ` Casey Schaufler
2022-06-28 16:12 ` KP Singh
2022-06-28 16:44 ` Frederick Lawler
2022-06-28 15:11 ` Frederick Lawler
2022-06-28 15:13 ` Paul Moore
2022-06-30 18:28 ` Eric W. Biederman
2022-07-01 3:47 ` Frederick Lawler
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