netdev - Re: [PATCH net v3] ovs: limit ovs recursions in ovs_execute

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Message-ID: <5699239E.9020706@stressinduktion.org>
Date:	Fri, 15 Jan 2016 17:51:42 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, dev@...nvswitch.org,
	Pravin Shelar <pshelar@....org>,
	Simon Horman <simon.horman@...ronome.com>
Subject: Re: [PATCH net v3] ovs: limit ovs recursions in ovs_execute_actions
 to not corrupt stack

On 15.01.2016 17:45, Eric Dumazet wrote:
> On Fri, 2016-01-15 at 15:33 +0100, Hannes Frederic Sowa wrote:
>> It was seen that defective configurations of openvswitch could overwrite
>> the STACK_END_MAGIC and cause a hard crash of the kernel because of too
>> many recursions within ovs.
>
> ...
>
>> +
>> +	preempt_disable();
>> +	level = __this_cpu_inc_return(exec_actions_level);
>> +	if (level > ovs_recursion_limit) {
>
> if (unlikely(level > ovs_recursion_limit)) {
>

Thanks, I added it!

Bye,
Hannes