netdev - Re: [PATCH v4 3/4] selftests/bpf: Add tests verifying bpf lsm userns

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Date:   Wed, 3 Aug 2022 00:08:42 +0200
From:   KP Singh <kpsingh@...nel.org>
To:     Frederick Lawler <fred@...udflare.com>
Cc:     revest@...omium.org, jackmanb@...omium.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        jmorris@...ei.org, serge@...lyn.com, paul@...l-moore.com,
        stephen.smalley.work@...il.com, eparis@...isplace.org,
        shuah@...nel.org, brauner@...nel.org, casey@...aufler-ca.com,
        ebiederm@...ssion.com, bpf@...r.kernel.org,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, kernel-team@...udflare.com,
        cgzones@...glemail.com, karl@...badwolfsecurity.com
Subject: Re: [PATCH v4 3/4] selftests/bpf: Add tests verifying bpf lsm
 userns_create hook

On Mon, Aug 1, 2022 at 8:02 PM Frederick Lawler <fred@...udflare.com> wrote:
>
> The LSM hook userns_create was introduced to provide LSM's an
> opportunity to block or allow unprivileged user namespace creation. This
> test serves two purposes: it provides a test eBPF implementation, and
> tests the hook successfully blocks or allows user namespace creation.
>
> This tests 3 cases:
>
>         1. Unattached bpf program does not block unpriv user namespace
>            creation.
>         2. Attached bpf program allows user namespace creation given
>            CAP_SYS_ADMIN privileges.
>         3. Attached bpf program denies user namespace creation for a
>            user without CAP_SYS_ADMIN.
>
> Signed-off-by: Frederick Lawler <fred@...udflare.com>

Looks good to me (Also checked it on vmtest.sh)

Acked-by: KP Singh <kpsingh@...nel.org>