From patchwork Mon Jul 4 09:53:38 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paolo Pisati X-Patchwork-Id: 103061 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from chlorine.canonical.com (chlorine.canonical.com [91.189.94.204]) by ozlabs.org (Postfix) with ESMTP id 4BDCDB6F76 for ; Mon, 4 Jul 2011 19:54:06 +1000 (EST) Received: from localhost ([127.0.0.1] helo=chlorine.canonical.com) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1Qdfqk-00038B-Ja; Mon, 04 Jul 2011 09:53:54 +0000 Received: from adelie.canonical.com ([91.189.90.139]) by chlorine.canonical.com with esmtp (Exim 4.71) (envelope-from ) id 1Qdfqe-00032h-Aa for kernel-team@lists.ubuntu.com; Mon, 04 Jul 2011 09:53:48 +0000 Received: from youngberry.canonical.com ([91.189.89.112]) by adelie.canonical.com with esmtp (Exim 4.71 #1 (Debian)) id 1Qdfqe-0001xV-8e for ; Mon, 04 Jul 2011 09:53:48 +0000 Received: from dynamic-adsl-94-36-146-179.clienti.tiscali.it ([94.36.146.179] helo=canonical.com) by youngberry.canonical.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1Qdfqe-0002vt-3Q for kernel-team@lists.ubuntu.com; Mon, 04 Jul 2011 09:53:48 +0000 From: paolo.pisati@canonical.com To: kernel-team@lists.ubuntu.com Subject: [PATCH 4/6] econet: 4 byte infoleak to the network CVE-2011-1173 Date: Mon, 4 Jul 2011 10:53:38 +0100 Message-Id: <1309773220-2418-5-git-send-email-paolo.pisati@canonical.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1309773220-2418-1-git-send-email-paolo.pisati@canonical.com> References: <1309773220-2418-1-git-send-email-paolo.pisati@canonical.com> X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.13 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: kernel-team-bounces@lists.ubuntu.com Errors-To: kernel-team-bounces@lists.ubuntu.com From: Vasiliy Kulikov BugLink: http://bugs.launchpad.net/bugs/801484 struct aunhdr has 4 padding bytes between 'pad' and 'handle' fields on x86_64. These bytes are not initialized in the variable 'ah' before sending 'ah' to the network. This leads to 4 bytes kernel stack infoleak. This bug was introduced before the git epoch. CVE-2011-1173 Signed-off-by: Vasiliy Kulikov Acked-by: Phil Blundell Signed-off-by: David S. Miller Signed-off-by: Paolo Pisati --- net/econet/af_econet.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/net/econet/af_econet.c b/net/econet/af_econet.c index 59092f4..bda42d3 100644 --- a/net/econet/af_econet.c +++ b/net/econet/af_econet.c @@ -434,10 +434,10 @@ static int econet_sendmsg(struct kiocb *iocb, struct socket *sock, udpdest.sin_addr.s_addr = htonl(network | addr.station); } + memset(&ah, 0, sizeof(ah)); ah.port = port; ah.cb = cb & 0x7f; ah.code = 2; /* magic */ - ah.pad = 0; /* tack our header on the front of the iovec */ size = sizeof(struct aunhdr);