From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753621Ab1GHFUx (ORCPT ); Fri, 8 Jul 2011 01:20:53 -0400 Received: from cantor2.suse.de ([195.135.220.15]:41572 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753063Ab1GHFAp (ORCPT ); Fri, 8 Jul 2011 01:00:45 -0400 X-Mailbox-Line: From gregkh@clark.kroah.org Thu Jul 7 17:16:54 2011 Message-Id: <20110708001653.932502215@clark.kroah.org> User-Agent: quilt/0.48-16.4 Date: Thu, 07 Jul 2011 17:15:44 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Eric Dumazet , Patrick McHardy , "David S. Miller" Subject: [012/107] af_packet: prevent information leak In-Reply-To: <20110708001740.GA14031@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.39-stable review patch. If anyone has any objections, please let us know. ------------------ From: Eric Dumazet [ Upstream commit 13fcb7bd322164c67926ffe272846d4860196dc6 ] In 2.6.27, commit 393e52e33c6c2 (packet: deliver VLAN TCI to userspace) added a small information leak. Add padding field and make sure its zeroed before copy to user. Signed-off-by: Eric Dumazet CC: Patrick McHardy Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/linux/if_packet.h | 2 ++ net/packet/af_packet.c | 2 ++ 2 files changed, 4 insertions(+) --- a/include/linux/if_packet.h +++ b/include/linux/if_packet.h @@ -62,6 +62,7 @@ struct tpacket_auxdata { __u16 tp_mac; __u16 tp_net; __u16 tp_vlan_tci; + __u16 tp_padding; }; /* Rx ring - header status */ @@ -100,6 +101,7 @@ struct tpacket2_hdr { __u32 tp_sec; __u32 tp_nsec; __u16 tp_vlan_tci; + __u16 tp_padding; }; #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll)) --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -799,6 +799,7 @@ static int tpacket_rcv(struct sk_buff *s h.h2->tp_sec = ts.tv_sec; h.h2->tp_nsec = ts.tv_nsec; h.h2->tp_vlan_tci = vlan_tx_tag_get(skb); + h.h2->tp_padding = 0; hdrlen = sizeof(*h.h2); break; default: @@ -1727,6 +1728,7 @@ static int packet_recvmsg(struct kiocb * aux.tp_net = skb_network_offset(skb); aux.tp_vlan_tci = vlan_tx_tag_get(skb); + aux.tp_padding = 0; put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux); }