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 DFA3845DF4D; Tue, 21 Jul 2026 22:23:46 +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=1784672628; cv=none; b=YXGlCY/FpN131J+Ck80vVfKhmXow83BjbOh0+F1CR+58/jLVSA5BYagzOBnzmro1IlhkUdVDzINefLs92SZZRNeTn8ybi94/ySxOypgwfBzoHdQxgzubh00rXuxdfsC9on2NGuqOtr9EhMOSYpfA9fHtgQEbH3E5jOFZNi2pLHM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672628; c=relaxed/simple; bh=0oMIkbR5nEwK/Gn8lmFFINu6NGk5VDYXtalXh5lja38=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OraU8Hp0jkRG5khDe4Azclr/nkr6mNe7M91f0iNJYSqZjrZDJqJMV7gh/VOqJrG2yIU3u2sXnK6Y2hiwqgfTvXXcYkRnTFxmByv3FDxxrR1ucxnlQBWYBx+jJC9A4PNEj6eGvUwfc4vy0gtJxSfN1TwC8sVipCgDzzzFmZwFNu8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ptCAyneb; 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="ptCAyneb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4BC161F000E9; Tue, 21 Jul 2026 22:23:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672626; bh=lX5mkJ9xitZPsJDcE/IXnPZEYDS5EeR4+Ez+aXb4Dmw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ptCAynebmpuzTLIDobb7DDjNzimjXcgfb8iHbekHHkJvv/VEeO/k0vpvsX/fdf8CH JLHqUpTg26FSzqXFDim5jdn8Pjd83EM5dQ/52AFsUMY1TXDhx89J5vslWqp6QloErX rsqWL7P06HdzbrwujR5VNjGohEG4mtyYipFIqjCk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Maoyi Xie , Nicolas Dichtel , Kuniyuki Iwashima , Jakub Kicinski Subject: [PATCH 5.15 679/843] net: sit: require CAP_NET_ADMIN in the device netns for changelink Date: Tue, 21 Jul 2026 17:25:14 +0200 Message-ID: <20260721152421.331776361@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 27ccb68e7cccead5d8c611665a45d23032d468b3 upstream. ipip6_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 ipip6_changelink() on rtnl_dev_link_net_capable() at its top, before any attribute is parsed. sit was the one tunnel type not covered by the recent series that added this check to the other changelink() handlers. Fixes: 5e6700b3bf98 ("sit: add support of x-netns") Link: https://lore.kernel.org/netdev/20260612085941.3158249-1-maoyixie.tju@gmail.com/ Cc: stable@vger.kernel.org Signed-off-by: Maoyi Xie Reviewed-by: Nicolas Dichtel Reviewed-by: Kuniyuki Iwashima Link: https://patch.msgid.link/20260618070817.3378283-1-maoyixie.tju@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/ipv6/sit.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -1679,6 +1679,9 @@ static int ipip6_changelink(struct net_d __u32 fwmark = t->fwmark; int err; + if (!rtnl_dev_link_net_capable(dev, net)) + return -EPERM; + if (dev == sitn->fb_tunnel_dev) return -EINVAL;