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[80.230.35.22]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47d7f6ef885sm284657415e9.9.2026.01.10.22.43.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jan 2026 22:43:41 -0800 (PST) Date: Sun, 11 Jan 2026 01:43:37 -0500 From: "Michael S. Tsirkin" To: Bobby Eshleman Cc: Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Stefan Hajnoczi , Jason Wang , Eugenio =?iso-8859-1?Q?P=E9rez?= , Xuan Zhuo , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Bryan Tan , Vishnu Dasa , Broadcom internal kernel review list , Shuah Khan , Long Li , linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, netdev@vger.kernel.org, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kselftest@vger.kernel.org, berrange@redhat.com, Sargun Dhillon , Bobby Eshleman Subject: Re: [PATCH RFC net-next v13 02/13] vsock: add netns to vsock core Message-ID: <20260111013536-mutt-send-email-mst@kernel.org> References: <20251223-vsock-vmtest-v13-0-9d6db8e7c80b@meta.com> <20251223-vsock-vmtest-v13-2-9d6db8e7c80b@meta.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251223-vsock-vmtest-v13-2-9d6db8e7c80b@meta.com> On Tue, Dec 23, 2025 at 04:28:36PM -0800, Bobby Eshleman wrote: > From: Bobby Eshleman > > Add netns logic to vsock core. Additionally, modify transport hook > prototypes to be used by later transport-specific patches (e.g., > *_seqpacket_allow()). > > Namespaces are supported primarily by changing socket lookup functions > (e.g., vsock_find_connected_socket()) to take into account the socket > namespace and the namespace mode before considering a candidate socket a > "match". > > This patch also introduces the sysctl /proc/sys/net/vsock/ns_mode to > report the mode and /proc/sys/net/vsock/child_ns_mode to set the mode > for new namespaces. > > Add netns functionality (initialization, passing to transports, procfs, > etc...) to the af_vsock socket layer. Later patches that add netns > support to transports depend on this patch. > > dgram_allow(), stream_allow(), and seqpacket_allow() callbacks are > modified to take a vsk in order to perform logic on namespace modes. In > future patches, the net will also be used for socket > lookups in these functions. > > Signed-off-by: Bobby Eshleman ... > static int __vsock_bind_connectible(struct vsock_sock *vsk, > struct sockaddr_vm *addr) > { > + struct net *net = sock_net(sk_vsock(vsk)); > static u32 port; > struct sockaddr_vm new_addr; > Hmm this static port gives me pause. So some port number info leaks between namespaces. I am not saying it's a big security issue and yet ... people expect isolation. -- MST