From patchwork Tue Jun 29 08:19:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Carpenter X-Patchwork-Id: 12349481 X-Patchwork-Delegate: kuba@kernel.org 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=-15.9 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY autolearn=unavailable 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 978C8C11F66 for ; Tue, 29 Jun 2021 08:20:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 77D2C61D6E for ; Tue, 29 Jun 2021 08:20:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232390AbhF2IWz (ORCPT ); Tue, 29 Jun 2021 04:22:55 -0400 Received: from mx0a-00069f02.pphosted.com ([205.220.165.32]:16776 "EHLO mx0a-00069f02.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232308AbhF2IWx (ORCPT ); Tue, 29 Jun 2021 04:22:53 -0400 Received: from pps.filterd (m0246629.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 15T8IBad021323; Tue, 29 Jun 2021 08:19:56 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=date : from : to : cc : subject : message-id : mime-version : content-type; s=corp-2020-01-29; bh=T73nHEN9/0mVEhiMXnpbAfPJaE649Q3WTjYrbNLmFeQ=; b=OhPq+zQpxXOIvUrY41dzimBGGE1tPa5Es7YKyHueUDd73owzmALSI1p0bEY0RDmAQjkJ LSRoWYEW3a1KIIvwuSkiWhfETJKH8ZmLXb+tRLn235odHGv8QPH61kzb51D61Hm7tlJg RxVYMVy0akjTLeEADeChlc6UZBIDmiJe4VebIZWQVZNYmcIwif42Cpvmfb7KKETQCKeB Tk5LuXl3mFw25dAPZ1aVcgo3y4s7unNQD3BpnOaNnt5BRLjp04JWMFto7QjOHXOnIbon NUTuneRFVdes8D4FqdOPbs1cU3U6mO2Cxmco5X2uQoBQ0FV/gNL/sacVh1BJ9dh5aj1J 0g== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by mx0b-00069f02.pphosted.com with ESMTP id 39f6pqawv7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 29 Jun 2021 08:19:56 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 15T8G2wX165599; Tue, 29 Jun 2021 08:19:55 GMT Received: from pps.reinject (localhost [127.0.0.1]) by aserp3030.oracle.com with ESMTP id 39dt9e9tm4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 29 Jun 2021 08:19:55 +0000 Received: from aserp3030.oracle.com (aserp3030.oracle.com [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 15T8JthL175286; Tue, 29 Jun 2021 08:19:55 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 39dt9e9tk5-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 29 Jun 2021 08:19:55 +0000 Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 15T8JqiN023507; Tue, 29 Jun 2021 08:19:52 GMT Received: from mwanda (/102.222.70.252) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 29 Jun 2021 01:19:52 -0700 Date: Tue, 29 Jun 2021 11:19:44 +0300 From: Dan Carpenter To: Vlad Yasevich , Xin Long Cc: Neil Horman , Marcelo Ricardo Leitner , "David S. Miller" , Jakub Kicinski , linux-sctp@vger.kernel.org, netdev@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH net] sctp: prevent info leak in sctp_make_heartbeat() Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Mailer: git-send-email haha only kidding X-Proofpoint-GUID: FF0gmXRVk0hhoiqxMpJ7aKd-AqjutkXi X-Proofpoint-ORIG-GUID: FF0gmXRVk0hhoiqxMpJ7aKd-AqjutkXi Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org The "hbinfo" struct has a 4 byte hole at the end so we have to zero it out to prevent stack information from being disclosed. Fixes: fe59379b9ab7 ("sctp: do the basic send and recv for PLPMTUD probe") Signed-off-by: Dan Carpenter --- Btw = {} is the newest way to initialize holes. In the past we have debated whether = {} will *always* zero out struct holes and it wasn't clear from the C standard. But it turns out that "= {}" is not part of the standard but is instead a GCC extension and it does clear the holes. In GCC (not the C standard) then = {0}; is also supposed to initialize holes in there was a bug in one version where it didn't. So that's nice, because adding memset()s to zero everywhere was ugly. net/sctp/sm_make_chunk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index 587fb3cb88e2..3a290f620e96 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -1162,7 +1162,7 @@ struct sctp_chunk *sctp_make_new_encap_port(const struct sctp_association *asoc, struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc, const struct sctp_transport *transport) { - struct sctp_sender_hb_info hbinfo; + struct sctp_sender_hb_info hbinfo = {}; struct sctp_chunk *retval; retval = sctp_make_control(asoc, SCTP_CID_HEARTBEAT, 0,