From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753911Ab3EGOZF (ORCPT ); Tue, 7 May 2013 10:25:05 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:42072 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932292Ab3EGNke (ORCPT ); Tue, 7 May 2013 09:40:34 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Mathias Krause , Herbert Xu , Luis Henriques Subject: [PATCH 012/118] crypto: algif - suppress sending source address information in recvmsg Date: Tue, 7 May 2013 14:37:38 +0100 Message-Id: <1367933964-1564-13-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1367933964-1564-1-git-send-email-luis.henriques@canonical.com> References: <1367933964-1564-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.5.7.12 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Krause commit 72a763d805a48ac8c0bf48fdb510e84c12de51fe upstream. The current code does not set the msg_namelen member to 0 and therefore makes net/socket.c leak the local sockaddr_storage variable to userland -- 128 bytes of kernel stack memory. Fix that. Signed-off-by: Mathias Krause Signed-off-by: Herbert Xu Signed-off-by: Luis Henriques --- crypto/algif_hash.c | 2 ++ crypto/algif_skcipher.c | 1 + 2 files changed, 3 insertions(+) diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c index ef5356c..0262210 100644 --- a/crypto/algif_hash.c +++ b/crypto/algif_hash.c @@ -161,6 +161,8 @@ static int hash_recvmsg(struct kiocb *unused, struct socket *sock, else if (len < ds) msg->msg_flags |= MSG_TRUNC; + msg->msg_namelen = 0; + lock_sock(sk); if (ctx->more) { ctx->more = 0; diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index 6a6dfc0..a1c4f0a 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -432,6 +432,7 @@ static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock, long copied = 0; lock_sock(sk); + msg->msg_namelen = 0; for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0; iovlen--, iov++) { unsigned long seglen = iov->iov_len; -- 1.8.1.2