From: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>
To: "Jérémy Jean" <Jeremy.Jean@oss.cyber.gouv.fr>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Kumar Kartikeya Dwivedi" <memxor@gmail.com>
Cc: <bpf@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<stable@vger.kernel.org>
Subject: Re: [PATCH] bpf: netns: require CAP_NET_ADMIN for link targets
Date: Mon, 02 Nov 2026 22:08:44 +0000 [thread overview]
Message-ID: <DML2GFI6LWXU.3ODKDXNQDBYYA@gmail.com> (raw)
In-Reply-To: <20261102202922.2515317-2-Jeremy.Jean@oss.cyber.gouv.fr>
On Mon, Nov 02, 2026 at 12:29 PM Jérémy Jean <Jeremy.Jean@oss.cyber.gouv.fr> wrote:
> BPF tokens allow a process to load BPF programs using CAP_NET_ADMIN in
> a userns, however, netns_bpf_link_create() does not check for
> CAP_NET_ADMIN in the target netns. Consequently, a token can be used
> to attach a BPF program to a netns it does not control.
That's not a gap. The prog FD and the netns FD are the permission.
pw-bot: cr
next prev parent reply other threads:[~2026-11-02 22:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-02 20:29 Jérémy Jean
2026-11-02 20:53 ` bot+bpf-ci
2026-11-02 22:08 ` Alexei Starovoitov [this message]
2026-11-02 22:35 ` Jérémy Jean
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