netdev - [PATCH net-next] net: Fix race condition in store_rps

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <1438792767-76704-1-git-send-email-tom@herbertland.com>
Date:	Wed, 5 Aug 2015 09:39:27 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	<davem@...emloft.net>, <netdev@...r.kernel.org>
CC:	<kernel-team@...com>
Subject: [PATCH net-next] net: Fix race condition in store_rps_map

There is a race condition in store_rps_map that allows jump label
count in rps_needed to go below zero. This can happen when
concurrently attempting to set and a clear map.

Scenario:

1. rps_needed count is zero
2. New map is assigned by setting thread, but rps_needed count _not_ yet
   incremented (rps_needed count still zero)
2. Map is cleared by second thread, old_map set to that just assigned
3. Second thread performs static_key_slow_dec, rps_needed count now goes
   negative

Fix is to increment or decrement rps_needed under the spinlock.

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 net/core/net-sysfs.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
index 194c1d0..39ec694 100644
--- a/net/core/net-sysfs.c
+++ b/net/core/net-sysfs.c
@@ -726,14 +726,17 @@ static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 	old_map = rcu_dereference_protected(queue->rps_map,
 					    lockdep_is_held(&rps_map_lock));
 	rcu_assign_pointer(queue->rps_map, map);
-	spin_unlock(&rps_map_lock);
 
 	if (map)
 		static_key_slow_inc(&rps_needed);
-	if (old_map) {
-		kfree_rcu(old_map, rcu);
+	if (old_map)
 		static_key_slow_dec(&rps_needed);
-	}
+
+	spin_unlock(&rps_map_lock);
+
+	if (old_map)
+		kfree_rcu(old_map, rcu);
+
 	free_cpumask_var(mask);
 	return len;
 }
-- 
1.8.5.6

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html