From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0B0BB43D51D; Tue, 21 Jul 2026 22:25:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672704; cv=none; b=bkcOHQjtwxt3NvfD9D82jCuZLe09pAPGJ7x3Dhpf2f5iEUsjLUn/DnN5bKNNT0GM3BJGNwNSOAwGtauVtL8lTMdfMltlu5Dv12kHGc7kTS1+PDTfKZR8mXPMbZA7WvA80vR1XIdNlq8LBgewGl9YKmxVrHO0zxWyxmEJdDFi6yE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672704; c=relaxed/simple; bh=6uv2eImwawh53nGO4YWtdR5rlDDYaI2otxx/oHo4iV8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CNNTp8Y5NTzpnLkTAnvhJkb2Vw3rMrQ99MbiYYEr80ECSnj30yTQN7jdn8UHIIQ2IyYZozHtm/4GA49M2Cyc0tIWgZ4JG6whoSxa1cVdQacFD53k4xwFCmabbZQvR2ARBIggE79T2hX1CCCb4pIzrhzTp60gF+iDuvC8UJ4QclY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MYhiuM2u; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="MYhiuM2u" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 980881F000E9; Tue, 21 Jul 2026 22:25:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672702; bh=lwDDsow8bArKaCxRYTakVxyaB232mM+7g6vVSXm/mBM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MYhiuM2u44VUZLOKxbViMue3XRFyubS5Pix3oet1XQnTfwKHwVqaOdAysyF6+QuLV 7N5UqImLMrzXVLZefpswmcgSs8XsuyrF+9j8IZH2w1MD23bcI8pS7xAgX+BHmZDJ2v RzfazVQa4q31/naqbYtcqrbm9oeMnfYin3F1VL+w= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiao Liang , Maoyi Xie , Kuniyuki Iwashima , Jakub Kicinski Subject: [PATCH 5.15 682/843] net: ip_vti: require CAP_NET_ADMIN in the device netns for changelink Date: Tue, 21 Jul 2026 17:25:17 +0200 Message-ID: <20260721152421.397103931@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Maoyi Xie commit 95cceadbfd52d7239bd730afdda0655287d77425 upstream. vti_changelink() operates on at most two netns, dev_net(dev) and the tunnel link netns t->net. They differ once the device is created in or moved to a netns other than the one the request runs in. The rtnl changelink path checks CAP_NET_ADMIN only against dev_net(dev), so a caller privileged there but not in t->net can rewrite a tunnel that lives in t->net. Gate vti_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed. Reported-by: Xiao Liang Closes: https://lore.kernel.org/netdev/CABAhCOSzP1vaThGV35_VnsRCb=87_CPjPVsTHbq905k8A+BuUg@mail.gmail.com/ Fixes: 895de9a3488a ("vti4: Enable namespace changing") Cc: stable@vger.kernel.org Signed-off-by: Maoyi Xie Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20260612085941.3158249-4-maoyixie.tju@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/ipv4/ip_vti.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/ipv4/ip_vti.c +++ b/net/ipv4/ip_vti.c @@ -579,6 +579,9 @@ static int vti_changelink(struct net_dev __u32 fwmark = t->fwmark; struct ip_tunnel_parm p; + if (!rtnl_dev_link_net_capable(dev, t->net)) + return -EPERM; + vti_netlink_parms(data, &p, &fwmark); return ip_tunnel_changelink(dev, tb, &p, fwmark); }