linux-kernel - Re: [PATCH v4 net 0/6] net/sched: Fixes for sch_ingress and sch

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Date:   Tue, 23 May 2023 13:17:02 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Cc:     Peilin Ye <peilin.ye@...edance.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        John Fastabend <john.fastabend@...il.com>,
        Vlad Buslov <vladbu@...lanox.com>,
        Pedro Tammela <pctammela@...atatu.com>,
        Hillf Danton <hdanton@...a.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Cong Wang <cong.wang@...edance.com>
Subject: Re: [PATCH v4 net 0/6] net/sched: Fixes for sch_ingress and
 sch_clsact

On Tue, May 23, 2023 at 12:12:39AM -0700, Peilin Ye wrote:
> [1,2/6]: ingress and clsact Qdiscs should only be created under ffff:fff1
>   [3/6]: Under ffff:fff1, only create ingress and clsact Qdiscs (for now,
>          at least)
>   [4/6]: After creating ingress and clsact Qdiscs under ffff:fff1, do not
>          graft them again to anywhere else (e.g. as the inner Qdisc of a
>          TBF Qdisc)
>   [5/6]: Prepare for [6/6], do not reuse that for-loop in qdisc_graft()
>          for ingress and clsact Qdiscs
>   [6/6]: Fix use-after-free [a] in mini_qdisc_pair_swap()

In v5, I'll improve [6/6] according to Vlad's suggestion [a], and fix
[1,2/6] according to Pedro's report [b].

[a] https://lore.kernel.org/r/87sfbnxhg7.fsf@nvidia.com/
[b] https://lore.kernel.org/r/e462a91e-8bea-8b72-481c-4a36699e4149@mojatatu.com/

Thanks,
Peilin Ye