netdev - Re: [PATCH 1/2] netfilter: xtables: fix reentrancy

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Message-ID: <4D8611EB.1080404@trash.net>
Date:	Sun, 20 Mar 2011 15:40:43 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>, netdev <netdev@...r.kernel.org>,
	Jan Engelhardt <jengelh@...ozas.de>
Subject: Re: [PATCH 1/2] netfilter: xtables: fix reentrancy

Am 18.03.2011 18:05, schrieb Eric Dumazet:
> commit f3c5c1bfd4308 (make ip_tables reentrant) introduced a race in
> handling the stackptr restore, at the end of ipt_do_table()
> 
> We should do it before the call to xt_info_rdunlock_bh(), or we allow
> cpu preemption and another cpu overwrites stackptr of original one.
> 
> A second fix is to change the underflow test to check the origptr value
> instead of 0 to detect underflow, or else we allow a jump from different
> hooks.

Applied, thanks Eric.
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