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=-5.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,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 E9127C48BEA for ; Mon, 24 Jun 2019 10:12:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B83C92146F for ; Mon, 24 Jun 2019 10:12:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561371138; bh=8J2ek7vj1Ztw0cwOVrjW589wi/e/fWDGfafVoe4r+Zc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ygc/kaleGEJ0cQKCiMzoyoKf+pd70q7ABFJOv+x6ez4Pfd/LCQ525QqE5ovzTkLf9 bojafXkMoUjNf6zsD5gpif+KbCnBNOMtQddCTBg1oAv+3Nf8LfA5u7uhQZvfyr22w9 fbgmcoVEjgL7Rj3oO+LqRfI4qg2MaE5gbufOC9Fw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729600AbfFXKGH (ORCPT ); Mon, 24 Jun 2019 06:06:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:38176 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729423AbfFXKGE (ORCPT ); Mon, 24 Jun 2019 06:06:04 -0400 Received: from localhost (f4.8f.5177.ip4.static.sl-reverse.com [119.81.143.244]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B6A12208E3; Mon, 24 Jun 2019 10:06:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1561370763; bh=8J2ek7vj1Ztw0cwOVrjW589wi/e/fWDGfafVoe4r+Zc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cSmGjZs7kzLGqIQ6RATf54nmqgamuQY+jExBBN1fWA7AjPyQfX1XhUuHB341o7XlU huxHf9i5x6vVv4JqGxuMaDKbOGKm34DiBMMo5HAgXQyGhezb8pIurPWIiV+H5W4O6i fWxjabBVin4Dc0HkfpdfMYlvcMitFVUjZha7pKmA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marcel Holtmann , Johan Hedberg Subject: [PATCH 4.19 81/90] Bluetooth: Align minimum encryption key size for LE and BR/EDR connections Date: Mon, 24 Jun 2019 17:57:11 +0800 Message-Id: <20190624092319.233578744@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190624092313.788773607@linuxfoundation.org> References: <20190624092313.788773607@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marcel Holtmann commit d5bb334a8e171b262e48f378bd2096c0ea458265 upstream. The minimum encryption key size for LE connections is 56 bits and to align LE with BR/EDR, enforce 56 bits of minimum encryption key size for BR/EDR connections as well. Signed-off-by: Marcel Holtmann Signed-off-by: Johan Hedberg Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- include/net/bluetooth/hci_core.h | 3 +++ net/bluetooth/hci_conn.c | 8 ++++++++ 2 files changed, 11 insertions(+) --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -182,6 +182,9 @@ struct adv_info { #define HCI_MAX_SHORT_NAME_LENGTH 10 +/* Min encryption key size to match with SMP */ +#define HCI_MIN_ENC_KEY_SIZE 7 + /* Default LE RPA expiry time, 15 minutes */ #define HCI_DEFAULT_RPA_TIMEOUT (15 * 60) --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -1276,6 +1276,14 @@ int hci_conn_check_link_mode(struct hci_ !test_bit(HCI_CONN_ENCRYPT, &conn->flags)) return 0; + /* The minimum encryption key size needs to be enforced by the + * host stack before establishing any L2CAP connections. The + * specification in theory allows a minimum of 1, but to align + * BR/EDR and LE transports, a minimum of 7 is chosen. + */ + if (conn->enc_key_size < HCI_MIN_ENC_KEY_SIZE) + return 0; + return 1; }