Return-path: Received: from mga05.intel.com ([192.55.52.43]:34303 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753439AbeAFBTI (ORCPT ); Fri, 5 Jan 2018 20:19:08 -0500 Subject: [PATCH 11/18] cw1200: prevent bounds-check bypass via speculative execution From: Dan Williams To: linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, peterz@infradead.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, Elena Reshetova , Solomon Peachy , gregkh@linuxfoundation.org, tglx@linutronix.de, torvalds@linux-foundation.org, Kalle Valo , alan@linux.intel.com Date: Fri, 05 Jan 2018 17:10:53 -0800 Message-ID: <151520105352.32271.1167586482542492342.stgit@dwillia2-desk3.amr.corp.intel.com> (sfid-20180106_022139_404502_2FEE2EA3) In-Reply-To: <151520099201.32271.4677179499894422956.stgit@dwillia2-desk3.amr.corp.intel.com> References: <151520099201.32271.4677179499894422956.stgit@dwillia2-desk3.amr.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-wireless-owner@vger.kernel.org List-ID: Static analysis reports that 'queue' may be a user controlled value that is used as a data dependency to read 'txq_params' from the 'priv->tx_queue_params.params' 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 value of 'txq_params'. In this case 'txq_params' is referenced later in the function. Based on an original patch by Elena Reshetova. Cc: Solomon Peachy 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/st/cw1200/sta.c | 10 ++++++---- drivers/net/wireless/st/cw1200/wsm.h | 4 +--- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/net/wireless/st/cw1200/sta.c b/drivers/net/wireless/st/cw1200/sta.c index 38678e9a0562..886942617f14 100644 --- a/drivers/net/wireless/st/cw1200/sta.c +++ b/drivers/net/wireless/st/cw1200/sta.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "cw1200.h" #include "sta.h" @@ -612,18 +613,19 @@ int cw1200_conf_tx(struct ieee80211_hw *dev, struct ieee80211_vif *vif, u16 queue, const struct ieee80211_tx_queue_params *params) { struct cw1200_common *priv = dev->priv; + struct wsm_set_tx_queue_params *txq_params; int ret = 0; /* To prevent re-applying PM request OID again and again*/ bool old_uapsd_flags; mutex_lock(&priv->conf_mutex); - if (queue < dev->queues) { + if ((txq_params = nospec_array_ptr(priv->tx_queue_params.params, + queue, dev->queues))) { old_uapsd_flags = le16_to_cpu(priv->uapsd_info.uapsd_flags); - WSM_TX_QUEUE_SET(&priv->tx_queue_params, queue, 0, 0, 0); - ret = wsm_set_tx_queue_params(priv, - &priv->tx_queue_params.params[queue], queue); + WSM_TX_QUEUE_SET(txq_params, 0, 0, 0); + ret = wsm_set_tx_queue_params(priv, txq_params, queue); if (ret) { ret = -EINVAL; goto out; diff --git a/drivers/net/wireless/st/cw1200/wsm.h b/drivers/net/wireless/st/cw1200/wsm.h index 48086e849515..8c8d9191e233 100644 --- a/drivers/net/wireless/st/cw1200/wsm.h +++ b/drivers/net/wireless/st/cw1200/wsm.h @@ -1099,10 +1099,8 @@ struct wsm_tx_queue_params { }; -#define WSM_TX_QUEUE_SET(queue_params, queue, ack_policy, allowed_time,\ - max_life_time) \ +#define WSM_TX_QUEUE_SET(p, ack_policy, allowed_time, max_life_time) \ do { \ - struct wsm_set_tx_queue_params *p = &(queue_params)->params[queue]; \ p->ackPolicy = (ack_policy); \ p->allowedMediumTime = (allowed_time); \ p->maxTransmitLifetime = (max_life_time); \