Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932878Ab3D2THx (ORCPT ); Mon, 29 Apr 2013 15:07:53 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:32812 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759977Ab3D2TDd (ORCPT ); Mon, 29 Apr 2013 15:03:33 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mathias Krause , Ralf Baechle , "David S. Miller" Subject: [ 18/30] ax25: fix info leak via msg_name in ax25_recvmsg() Date: Mon, 29 Apr 2013 12:02:42 -0700 Message-Id: <20130429184357.353789210@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.rc1.5.g7e0651a In-Reply-To: <20130429184355.299556377@linuxfoundation.org> References: <20130429184355.299556377@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1572 Lines: 45 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Krause [ Upstream commit ef3313e84acbf349caecae942ab3ab731471f1a1 ] When msg_namelen is non-zero the sockaddr info gets filled out, as requested, but the code fails to initialize the padding bytes of struct sockaddr_ax25 inserted by the compiler for alignment. Additionally the msg_namelen value is updated to sizeof(struct full_sockaddr_ax25) but is not always filled up to this size. Both issues lead to the fact that the code will leak uninitialized kernel stack bytes in net/socket.c. Fix both issues by initializing the memory with memset(0). Signed-off-by: Mathias Krause Cc: Ralf Baechle Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ax25/af_ax25.c | 1 + 1 file changed, 1 insertion(+) --- a/net/ax25/af_ax25.c +++ b/net/ax25/af_ax25.c @@ -1641,6 +1641,7 @@ static int ax25_recvmsg(struct kiocb *io ax25_address src; const unsigned char *mac = skb_mac_header(skb); + memset(sax, 0, sizeof(struct full_sockaddr_ax25)); ax25_addr_parse(mac + 1, skb->data - mac - 1, &src, NULL, &digi, NULL, NULL); sax->sax25_family = AF_AX25; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/