netdev - Re: [PATCH] tipc: fix deadlock during socket release

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-prev] [day] [month] [year] [list]

Date:	Sun, 29 Dec 2013 22:24:35 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ying.xue@...driver.com
Cc:	netdev@...r.kernel.org, jon.maloy@...csson.com,
	Paul.Gortmaker@...driver.com, erik.hugne@...csson.com,
	lars.everbrand@...csson.com, tipc-discussion@...ts.sourceforge.net
Subject: Re: [PATCH] tipc: fix deadlock during socket release

From: Ying Xue <ying.xue@...driver.com>
Date: Fri, 27 Dec 2013 10:18:28 +0800

> A deadlock might occur if name table is withdrawn in socket release
> routine, and while packets are still being received from bearer.
> 
>        CPU0                       CPU1
> T0:   recv_msg()               release()
> T1:   tipc_recv_msg()          tipc_withdraw()
> T2:   [grab node lock]         [grab port lock]
> T3:   tipc_link_wakeup_ports() tipc_nametbl_withdraw()
> T4:   [grab port lock]*        named_cluster_distribute()
> T5:   wakeupdispatch()         tipc_link_send()
> T6:                            [grab node lock]*
> 
> The opposite order of holding port lock and node lock on above two
> different paths may result in a deadlock. If socket lock instead of
> port lock is used to protect port instance in tipc_withdraw(), the
> reverse order of holding port lock and node lock will be eliminated,
> as a result, the deadlock is killed as well.
> 
> Reported-by: Lars Everbrand <lars.everbrand@...csson.com>
> Reviewed-by: Erik Hugne <erik.hugne@...csson.com>
> Signed-off-by: Ying Xue <ying.xue@...driver.com>

Applied, thanks.
--
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