linux-kernel - [PATCH 09/18] p54: prevent bounds-check bypass via speculative execution

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Message-ID: <151520104323.32271.6614158873750932410.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Fri, 05 Jan 2018 17:10:43 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, peterz@...radead.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Elena Reshetova <elena.reshetova@...el.com>,
        gregkh@...uxfoundation.org,
        Christian Lamparter <chunkeey@...glemail.com>,
        tglx@...utronix.de, torvalds@...ux-foundation.org,
        Kalle Valo <kvalo@...eaurora.org>, alan@...ux.intel.com
Subject: [PATCH 09/18] p54: prevent bounds-check bypass via speculative
 execution

Static analysis reports that 'queue' may be a user controlled value that
is used as a data dependency to read from the 'priv->qos_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 result of 'priv->qos_params[queue]'.

Based on an original patch by Elena Reshetova.

Cc: Christian Lamparter <chunkeey@...glemail.com>
Cc: Kalle Valo <kvalo@...eaurora.org>
Cc: linux-wireless@...r.kernel.org
Cc: netdev@...r.kernel.org
Signed-off-by: Elena Reshetova <elena.reshetova@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 drivers/net/wireless/intersil/p54/main.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/intersil/p54/main.c b/drivers/net/wireless/intersil/p54/main.c
index ab6d39e12069..85c9cbee35fc 100644
--- a/drivers/net/wireless/intersil/p54/main.c
+++ b/drivers/net/wireless/intersil/p54/main.c
@@ -20,6 +20,7 @@
 #include <linux/firmware.h>
 #include <linux/etherdevice.h>
 #include <linux/module.h>
+#include <linux/compiler.h>
 
 #include <net/mac80211.h>
 
@@ -411,12 +412,13 @@ static int p54_conf_tx(struct ieee80211_hw *dev,
 		       const struct ieee80211_tx_queue_params *params)
 {
 	struct p54_common *priv = dev->priv;
+	struct p54_edcf_queue_param *p54_q;
 	int ret;
 
 	mutex_lock(&priv->conf_mutex);
-	if (queue < dev->queues) {
-		P54_SET_QUEUE(priv->qos_params[queue], params->aifs,
-			params->cw_min, params->cw_max, params->txop);
+	if ((p54_q = nospec_array_ptr(priv->qos_params, queue, dev->queues))) {
+		P54_SET_QUEUE(p54_q[0], params->aifs, params->cw_min,
+				params->cw_max, params->txop);
 		ret = p54_set_edcf(priv);
 	} else
 		ret = -EINVAL;