netdev - Re: [PATCH net v2] net/sched: sch_hfsc: upgrade 'rt' to 'sc' when it becomes a inner curve

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Date: Thu, 19 Oct 2023 01:20:24 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Pedro Tammela <pctammela@...atatu.com>
Cc: netdev@...r.kernel.org, jhs@...atatu.com, xiyou.wangcong@...il.com,
 jiri@...nulli.us, davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
 pabeni@...hat.com, ct@...ingcircus.io, markovicbudimir@...il.com
Subject: Re: [PATCH net v2] net/sched: sch_hfsc: upgrade 'rt' to 'sc' when it
 becomes a inner curve

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Tue, 17 Oct 2023 11:36:02 -0300 you wrote:
> Christian Theune says:
>    I upgraded from 6.1.38 to 6.1.55 this morning and it broke my traffic shaping script,
>    leaving me with a non-functional uplink on a remote router.
> 
> A 'rt' curve cannot be used as a inner curve (parent class), but we were
> allowing such configurations since the qdisc was introduced. Such
> configurations would trigger a UAF as Budimir explains:
>    The parent will have vttree_insert() called on it in init_vf(),
>    but will not have vttree_remove() called on it in update_vf()
>    because it does not have the HFSC_FSC flag set.
> 
> [...]

Here is the summary with links:
  - [net,v2] net/sched: sch_hfsc: upgrade 'rt' to 'sc' when it becomes a inner curve
    https://git.kernel.org/netdev/net/c/a13b67c9a015

You are awesome, thank you!
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