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Mon, 02 Nov 2026 14:08:45 -0800 (PST) Received: from localhost ([153.61.198.249]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b07c666cdcsm986281a91.11.2026.11.02.14.08.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Nov 2026 14:08:45 -0800 (PST) Content-Type: text/plain; charset=UTF-8 Date: Mon, 02 Nov 2026 22:08:44 +0000 Message-Id: Cc: , , Subject: Re: [PATCH] bpf: netns: require CAP_NET_ADMIN for link targets From: "Alexei Starovoitov" To: =?utf-8?q?J=C3=A9r=C3=A9my_Jean?= , "Daniel Borkmann" , "Andrii Nakryiko" , "Eduard Zingerman" , "Kumar Kartikeya Dwivedi" In-Reply-To: <20261102202922.2515317-2-Jeremy.Jean@oss.cyber.gouv.fr> References: <20261102202922.2515317-2-Jeremy.Jean@oss.cyber.gouv.fr> Content-Transfer-Encoding: 8bit X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Mon, Nov 02, 2026 at 12:29 PM Jérémy Jean 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