This is a note to let you know that I've just added the patch titled
inet: fix races in reqsk_queue_hash_req()
to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
inet-fix-races-in-reqsk_queue_hash_req.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Oct 22 17:25:24 PDT 2015
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Sat, 19 Sep 2015 09:48:04 -0700
Subject: inet: fix races in reqsk_queue_hash_req()
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 29c6852602e259d2c1882f320b29d5c3fec0de04 ]
Before allowing lockless LISTEN processing, we need to make
sure to arm the SYN_RECV timer before the req socket is visible
in hash tables.
Also, req->rsk_hash should be written before we set rsk_refcnt
to a non zero value.
Fixes: fa76ce7328b2 ("inet: get rid of central tcp/dccp listener timer")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Ying Cai <ycai@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/inet_connection_sock.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -685,20 +685,20 @@ void reqsk_queue_hash_req(struct request
req->num_timeout = 0;
req->sk = NULL;
+ setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req);
+ mod_timer_pinned(&req->rsk_timer, jiffies + timeout);
+ req->rsk_hash = hash;
+
/* before letting lookups find us, make sure all req fields
* are committed to memory and refcnt initialized.
*/
smp_wmb();
atomic_set(&req->rsk_refcnt, 2);
- setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req);
- req->rsk_hash = hash;
spin_lock(&queue->syn_wait_lock);
req->dl_next = lopt->syn_table[hash];
lopt->syn_table[hash] = req;
spin_unlock(&queue->syn_wait_lock);
-
- mod_timer_pinned(&req->rsk_timer, jiffies + timeout);
}
EXPORT_SYMBOL(reqsk_queue_hash_req);
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-4.2/inet-fix-races-in-reqsk_queue_hash_req.patch
queue-4.2/net-add-pfmemalloc-check-in-sk_add_backlog.patch
queue-4.2/inet-fix-race-in-reqsk_queue_unlink.patch
queue-4.2/net-unix-fix-logic-about-sk_peek_offset.patch
queue-4.2/act_mirred-clear-sender-cpu-before-sending-to-tx.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html