Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753338AbcDZST0 (ORCPT ); Tue, 26 Apr 2016 14:19:26 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:56613 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753316AbcDZSTX (ORCPT ); Tue, 26 Apr 2016 14:19:23 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Mathias Krause , "Eric W . Biederman" , Pavel Emelyanov , "David S . Miller" , Kamal Mostafa Subject: [PATCH 4.2.y-ckt 81/93] packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface Date: Tue, 26 Apr 2016 11:17:21 -0700 Message-Id: <1461694653-29506-82-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1461694653-29506-1-git-send-email-kamal@canonical.com> References: <1461694653-29506-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 4.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1409 Lines: 39 4.2.8-ckt9 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Mathias Krause commit 309cf37fe2a781279b7675d4bb7173198e532867 upstream. Because we miss to wipe the remainder of i->addr[] in packet_mc_add(), pdiag_put_mclist() leaks uninitialized heap bytes via the PACKET_DIAG_MCLIST netlink attribute. Fix this by explicitly memset(0)ing the remaining bytes in i->addr[]. Fixes: eea68e2f1a00 ("packet: Report socket mclist info via diag module") Signed-off-by: Mathias Krause Cc: Eric W. Biederman Cc: Pavel Emelyanov Acked-by: Pavel Emelyanov Signed-off-by: David S. Miller Signed-off-by: Kamal Mostafa --- net/packet/af_packet.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 05a425b..5484016 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -3309,6 +3309,7 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq) i->ifindex = mreq->mr_ifindex; i->alen = mreq->mr_alen; memcpy(i->addr, mreq->mr_address, i->alen); + memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen); i->count = 1; i->next = po->mclist; po->mclist = i; -- 2.7.4