From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05E19C46471 for ; Tue, 7 Aug 2018 18:55:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BC7262151D for ; Tue, 7 Aug 2018 18:55:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BC7262151D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404421AbeHGVLd (ORCPT ); Tue, 7 Aug 2018 17:11:33 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:33776 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389242AbeHGVLd (ORCPT ); Tue, 7 Aug 2018 17:11:33 -0400 Received: from localhost (unknown [194.244.16.108]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 5F27BD07; Tue, 7 Aug 2018 18:55:49 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "David S. Miller" , Herbert Xu , Steffen Klassert , netdev@vger.kernel.org, Dmitry Safonov Subject: [PATCH 4.4 05/12] netlink: Do not subscribe to non-existent groups Date: Tue, 7 Aug 2018 20:52:09 +0200 Message-Id: <20180807172343.564084407@linuxfoundation.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180807172343.326201671@linuxfoundation.org> References: <20180807172343.326201671@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dmitry Safonov [ Upstream commit 7acf9d4237c46894e0fa0492dd96314a41742e84 ] Make ABI more strict about subscribing to group > ngroups. Code doesn't check for that and it looks bogus. (one can subscribe to non-existing group) Still, it's possible to bind() to all possible groups with (-1) Cc: "David S. Miller" Cc: Herbert Xu Cc: Steffen Klassert Cc: netdev@vger.kernel.org Signed-off-by: Dmitry Safonov Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/netlink/af_netlink.c | 1 + 1 file changed, 1 insertion(+) --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -985,6 +985,7 @@ static int netlink_bind(struct socket *s if (err) return err; } + groups &= (1UL << nlk->ngroups) - 1; bound = nlk->bound; if (bound) {