From patchwork Fri Jan 12 00:47:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 10160267 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2344560327 for ; Fri, 12 Jan 2018 11:30:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0FF6C207A7 for ; Fri, 12 Jan 2018 11:30:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 03DEB285A5; Fri, 12 Jan 2018 11:30:49 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id F20C5207A7 for ; Fri, 12 Jan 2018 11:30:47 +0000 (UTC) Received: (qmail 21851 invoked by uid 550); 12 Jan 2018 11:29:22 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Delivered-To: moderator for kernel-hardening@lists.openwall.com Received: (qmail 25754 invoked from network); 12 Jan 2018 00:56:13 -0000 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,346,1511856000"; d="scan'208";a="9503188" From: Dan Williams To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, kernel-hardening@lists.openwall.com, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Elena Reshetova , Christian Lamparter , tglx@linutronix.de, torvalds@linux-foundation.org, akpm@linux-foundation.org, Kalle Valo , alan@linux.intel.com Date: Thu, 11 Jan 2018 16:47:46 -0800 Message-ID: <151571806633.27429.1504260808341642890.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <151571798296.27429.7166552848688034184.stgit@dwillia2-desk3.amr.corp.intel.com> References: <151571798296.27429.7166552848688034184.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.17.1-9-g687f MIME-Version: 1.0 Subject: [kernel-hardening] [PATCH v2 15/19] carl9170: prevent bounds-check bypass via speculative execution X-Virus-Scanned: ClamAV using ClamSMTP Static analysis reports that 'queue' may be a user controlled value that is used as a data dependency to read from the 'ar9170_qmap' array. In order to avoid potential leaks of kernel memory values, block speculative execution of the instruction stream that could issue reads based on an invalid result of 'ar9170_qmap[queue]'. In this case the value of 'ar9170_qmap[queue]' is immediately reused as an index to the 'ar->edcf' array. Based on an original patch by Elena Reshetova. Cc: Christian Lamparter Cc: Kalle Valo Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Elena Reshetova Signed-off-by: Dan Williams --- drivers/net/wireless/ath/carl9170/main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c index 988c8857d78c..0acfa8c22b7d 100644 --- a/drivers/net/wireless/ath/carl9170/main.c +++ b/drivers/net/wireless/ath/carl9170/main.c @@ -41,6 +41,7 @@ #include #include #include +#include #include #include #include "hw.h" @@ -1384,11 +1385,13 @@ static int carl9170_op_conf_tx(struct ieee80211_hw *hw, const struct ieee80211_tx_queue_params *param) { struct ar9170 *ar = hw->priv; + const u8 *elem; int ret; mutex_lock(&ar->mutex); - if (queue < ar->hw->queues) { - memcpy(&ar->edcf[ar9170_qmap[queue]], param, sizeof(*param)); + elem = array_ptr(ar9170_qmap, queue, ar->hw->queues); + if (elem) { + memcpy(&ar->edcf[*elem], param, sizeof(*param)); ret = carl9170_set_qos(ar); } else { ret = -EINVAL;