From: David Miller <davem@davemloft.net>
To: eric.dumazet@gmail.com
Cc: kdakhane@gmail.com, netdev@vger.kernel.org,
netfilter@vger.kernel.org, zbr@ioremap.net
Subject: Re: [PATCH 2/2] tcp: Fix a connect() race with timewait sockets
Date: Tue, 08 Dec 2009 20:19:00 -0800 (PST) [thread overview]
Message-ID: <20091208.201900.109640288.davem@davemloft.net> (raw)
In-Reply-To: <4B1912FE.9020600@gmail.com>
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 04 Dec 2009 14:47:42 +0100
> When we find a timewait connection in __inet_hash_connect() and reuse
> it for a new connection request, we have a race window, releasing bind
> list lock and reacquiring it in __inet_twsk_kill() to remove timewait
> socket from list.
>
> Another thread might find the timewait socket we already chose, leading to
> list corruption and crashes.
>
> Fix is to remove timewait socket from bind list before releasing the bind lock.
>
> Note: This problem happens if sysctl_tcp_tw_reuse is set.
>
> Reported-by: kapil dakhane <kdakhane@gmail.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Applied and queued up for -stable, thanks!
prev parent reply other threads:[~2009-12-09 4:19 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-01 2:02 soft lockup in inet_csk_get_port kapil dakhane
2009-12-01 6:10 ` Eric Dumazet
2009-12-01 15:00 ` [PATCH] tcp: Fix a connect() race with timewait sockets Eric Dumazet
2009-12-02 8:59 ` David Miller
2009-12-02 9:23 ` Eric Dumazet
2009-12-02 10:33 ` Eric Dumazet
2009-12-02 11:32 ` Evgeniy Polyakov
2009-12-02 19:18 ` kapil dakhane
2009-12-03 2:43 ` kapil dakhane
2009-12-03 10:49 ` [PATCH] tcp: fix a timewait refcnt race Eric Dumazet
2009-12-04 0:19 ` David Miller
2009-12-04 3:20 ` kapil dakhane
2009-12-04 6:29 ` Eric Dumazet
2009-12-04 6:39 ` David Miller
2009-12-02 15:08 ` [PATCH net-next-2.6] tcp: connect() race with timewait reuse Eric Dumazet
2009-12-02 22:15 ` Evgeniy Polyakov
2009-12-03 6:44 ` Eric Dumazet
2009-12-03 8:31 ` Eric Dumazet
2009-12-03 23:22 ` Evgeniy Polyakov
2009-12-04 0:18 ` David Miller
2009-12-02 16:05 ` [PATCH] tcp: Fix a connect() race with timewait sockets Ashwani Wason
2009-12-03 6:38 ` David Miller
2009-12-04 13:45 ` [PATCH 0/2] tcp: Fix connect() races " Eric Dumazet
2009-12-04 13:46 ` [PATCH 1/2] tcp: Fix a connect() race " Eric Dumazet
2009-12-05 21:21 ` Evgeniy Polyakov
2009-12-07 9:59 ` [PATCH] tcp: documents timewait refcnt tricks Eric Dumazet
2009-12-07 16:06 ` Randy Dunlap
2009-12-09 4:20 ` David Miller
2009-12-09 4:18 ` [PATCH 1/2] tcp: Fix a connect() race with timewait sockets David Miller
2009-12-04 13:47 ` [PATCH 2/2] " Eric Dumazet
2009-12-09 4:19 ` David Miller [this message]
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