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Doruk Tan Ozturk says: ==================== vxlan, geneve: require CAP_NET_ADMIN in the device netns for changelink The recent series "require CAP_NET_ADMIN in the device netns for changelink" (8165f7ff57d9..27ccb68e7ccc) added rtnl_dev_link_net_capable() and gated the eight IP tunnel drivers (ip_gre, ipip, ip_vti, ip6_tunnel, ip6_gre, ip6_vti, sit, xfrm_interface). VXLAN and GENEVE share the exact same shape but were not covered: both store the underlay netns sticky at newlink (vxlan->net / geneve->net) and their changelink() operates on that netns, while the generic RTM_NEWLINK path only checks CAP_NET_ADMIN against dev_net(dev). Once such a device is created in or moved to another netns, a caller privileged in dev_net(dev) but not in the underlay netns can reconfigure the tunnel'"'"'s underlay. This completes that series for the two UDP tunnel drivers that were left out. Same helper, same placement (top of changelink, before any attribute is parsed). Verified on next-20260714 in QEMU with CONFIG_VXLAN=y + CONFIG_USER_NS=y: an unprivileged user namespace holding CAP_NET_ADMIN only in a child netns issues an IFLA_INFO_DATA changelink on a vxlan device whose underlay lives in init_net. Before: returns 0 (reconfigures the init_net underlay). After: returns -EPERM. ==================== Link: https://patch.msgid.link/20260716203500.70573-1-doruk@0sec.ai Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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