netdev - Re: [PATCH net 1/1] net/sched: taprio: Check if socket flags are valid

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Date:   Fri, 18 Mar 2022 18:11:33 -0700
From:   Vinicius Costa Gomes <vinicius.gomes@...el.com>
To:     Benedikt Spranger <b.spranger@...utronix.de>,
        netdev@...r.kernel.org
Cc:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net 1/1] net/sched: taprio: Check if socket flags are valid

Benedikt Spranger <b.spranger@...utronix.de> writes:

> A user may set the SO_TXTIME socket option to ensure a packet is send
> at a given time. The taprio scheduler has to confirm, that it is allowed
> to send a packet at that given time, by a check against the packet time
> schedule. The scheduler drop the packet, if the gates are closed at the
> given send time.
>
> The check, if SO_TXTIME is set, may fail since sk_flags are part of an
> union and the union is used otherwise. This happen, if a socket is not
> a full socket, like a request socket for example.
>
> Add a check to verify, if the union is used for sk_flags.
>
> Fixes: 4cfd5779bd6e ("taprio: Add support for txtime-assist mode")
> Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
> Reviewed-by: Kurt Kanzenbach <kurt@...utronix.de>
> ---

>  net/sched/sch_taprio.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
> index 1ce6416b4810..86911a61e739 100644
> --- a/net/sched/sch_taprio.c
> +++ b/net/sched/sch_taprio.c
> @@ -419,7 +419,8 @@ static int taprio_enqueue_one(struct sk_buff *skb, struct Qdisc *sch,
>  {
>  	struct taprio_sched *q = qdisc_priv(sch);
>  
> -	if (skb->sk && sock_flag(skb->sk, SOCK_TXTIME)) {
> +	/* sk_flags are only save to use on full sockets. */


A very minor nitpick: it should have been "safe to use".

Apart from that,

Acked-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>

> +	if (skb->sk && sk_fullsock(skb->sk) && sock_flag(skb->sk, SOCK_TXTIME)) {
>  		if (!is_valid_interval(skb, sch))
>  			return qdisc_drop(skb, sch, to_free);
>  	} else if (TXTIME_ASSIST_IS_ENABLED(q->flags)) {
> -- 
> 2.20.1
>


Cheers,
-- 
Vinicius