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Date: Fri, 15 Jan 2016 08:45:57 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Hannes Frederic Sowa <hannes@...essinduktion.org> 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 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)) {
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