netdev - Re: [PATCH net-next 1/2] net/sched: act_mirred: better wording on protection against excessive stack growth

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Date:   Mon, 23 Jan 2023 14:22:32 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Davide Caratti <dcaratti@...hat.com>
Cc:     jhs@...atatu.com, jiri@...nulli.us, lucien.xin@...il.com,
        netdev@...r.kernel.org, pabeni@...hat.com, wizhao@...hat.com,
        xiyou.wangcong@...il.com
Subject: Re: [PATCH net-next 1/2] net/sched: act_mirred: better wording on
 protection against excessive stack growth

On Fri, Jan 20, 2023 at 06:01:39PM +0100, Davide Caratti wrote:
> with commit e2ca070f89ec ("net: sched: protect against stack overflow in
> TC act_mirred"), act_mirred protected itself against excessive stack growth
> using per_cpu counter of nested calls to tcf_mirred_act(), and capping it
> to MIRRED_RECURSION_LIMIT. However, such protection does not detect
> recursion/loops in case the packet is enqueued to the backlog (for example,
> when the mirred target device has RPS or skb timestamping enabled). Change
> the wording from "recursion" to "nesting" to make it more clear to readers.
> 
> CC: Jamal Hadi Salim <jhs@...atatu.com>
> Signed-off-by: Davide Caratti <dcaratti@...hat.com>

Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>