netdev - Re: Use-after-free in Linux tc subsystem (v6.15)

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Message-ID: <1a169adc-fe99-4058-a6a7-e32bb694e997@mojatatu.com>
Date: Mon, 30 Jun 2025 08:52:22 -0300
From: Victor Nogueira <victor@...atatu.com>
To: Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>
Cc: Mingi Cho <mgcho.minic@...il.com>, security@...nel.org,
 Jiri Pirko <jiri@...nulli.us>,
 Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: Use-after-free in Linux tc subsystem (v6.15)

On 6/30/25 08:06, Jamal Hadi Salim wrote:
> On Sun, Jun 29, 2025 at 5:08 PM Cong Wang <xiyou.wangcong@...il.com> wrote:
>>
>> On Sat, Jun 28, 2025 at 05:26:59PM -0400, Jamal Hadi Salim wrote:
>>> On Thu, Jun 26, 2025 at 1:11 AM Mingi Cho <mgcho.minic@...il.com> wrote:
>>>> Hello,
>>>>
>>>> I think the testcase I reported earlier actually contains two
>>>> different bugs. The first is returning SUCCESS with an empty TBF qdisc
>>>> in tbf_segment, and the second is returning SUCCESS with an empty QFQ
>>>> qdisc in qfq_enqueue.
>>>>
>>>
>>> Please join the list where a more general solution is being discussed here:
>>> https://lore.kernel.org/netdev/aF847kk6H+kr5kIV@pop-os.localdomain/
>>
>> I think that one is different, the one here is related to GSO, the above
>> linked one is not. Let me think about the GSO issue, since I already
>> looked into it before.
> 
> TBH, they all look the same to me - at minimal, they should be tested
> against Lion's patch first. Maybe there's a GSO corner case but wasnt
> clear to me.

I did a quick test of Lion's patch using Mingi's C reproducer.
The patch seems to fix the UAF.

cheers,
Victor