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Message-ID: <lsq.1520823972.857925406@decadent.org.uk>
Date: Mon, 12 Mar 2018 03:06:12 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, kernel-hardening@...ts.openwall.com,
torvalds@...ux-foundation.org,
"Elena Reshetova" <elena.reshetova@...el.com>,
"Thomas Gleixner" <tglx@...utronix.de>,
alan@...ux.intel.com,
"Dan Williams" <dan.j.williams@...el.com>,
"David S. Miller" <davem@...emloft.net>,
linux-arch@...r.kernel.org,
"Christian Lamparter" <chunkeey@...il.com>,
linux-wireless@...r.kernel.org, gregkh@...uxfoundation.org,
"Johannes Berg" <johannes@...solutions.net>
Subject: [PATCH 3.16 58/76] nl80211: Sanitize array index in parse_txq_params
3.16.56-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Dan Williams <dan.j.williams@...el.com>
commit 259d8c1e984318497c84eef547bbb6b1d9f4eb05 upstream.
Wireless drivers rely on parse_txq_params to validate that txq_params->ac
is less than NL80211_NUM_ACS by the time the low-level driver's ->conf_tx()
handler is called. Use a new helper, array_index_nospec(), to sanitize
txq_params->ac with respect to speculation. I.e. ensure that any
speculation into ->conf_tx() handlers is done with a value of
txq_params->ac that is within the bounds of [0, NL80211_NUM_ACS).
Reported-by: Christian Lamparter <chunkeey@...il.com>
Reported-by: Elena Reshetova <elena.reshetova@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Johannes Berg <johannes@...solutions.net>
Cc: linux-arch@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com
Cc: gregkh@...uxfoundation.org
Cc: linux-wireless@...r.kernel.org
Cc: torvalds@...ux-foundation.org
Cc: "David S. Miller" <davem@...emloft.net>
Cc: alan@...ux.intel.com
Link: https://lkml.kernel.org/r/151727419584.33451.7700736761686184303.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
net/wireless/nl80211.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -14,6 +14,7 @@
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <linux/netlink.h>
+#include <linux/nospec.h>
#include <linux/etherdevice.h>
#include <net/net_namespace.h>
#include <net/genetlink.h>
@@ -1829,20 +1830,22 @@ static const struct nla_policy txq_param
static int parse_txq_params(struct nlattr *tb[],
struct ieee80211_txq_params *txq_params)
{
+ u8 ac;
+
if (!tb[NL80211_TXQ_ATTR_AC] || !tb[NL80211_TXQ_ATTR_TXOP] ||
!tb[NL80211_TXQ_ATTR_CWMIN] || !tb[NL80211_TXQ_ATTR_CWMAX] ||
!tb[NL80211_TXQ_ATTR_AIFS])
return -EINVAL;
- txq_params->ac = nla_get_u8(tb[NL80211_TXQ_ATTR_AC]);
+ ac = nla_get_u8(tb[NL80211_TXQ_ATTR_AC]);
txq_params->txop = nla_get_u16(tb[NL80211_TXQ_ATTR_TXOP]);
txq_params->cwmin = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMIN]);
txq_params->cwmax = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMAX]);
txq_params->aifs = nla_get_u8(tb[NL80211_TXQ_ATTR_AIFS]);
- if (txq_params->ac >= NL80211_NUM_ACS)
+ if (ac >= NL80211_NUM_ACS)
return -EINVAL;
-
+ txq_params->ac = array_index_nospec(ac, NL80211_NUM_ACS);
return 0;
}
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