netdev - Re: size overflow in function qdisc_tree_decrease_qlen net/sched/sch

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Message-ID: <CAHA+R7NdbMgfWpdCoP8peXT3zBX1=B_HWhsykjcT3QO=Gk-9aQ@mail.gmail.com>
Date:	Mon, 30 Nov 2015 20:50:29 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Daniele Fucini <dfucini@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	David Miller <davem@...emloft.net>, spender@...ecurity.net,
	pageexec@...email.hu, re.emese@...il.com
Subject: Re: size overflow in function qdisc_tree_decrease_qlen net/sched/sch_api.c

On Mon, Nov 30, 2015 at 5:00 PM, Daniele Fucini <dfucini@...il.com> wrote:
> Hello,
>
> I'm using a Grsecurity patched kernel (version 4.2.6-201511282239) and
> I'm getting system freezes due to PaX detecting a size overflow in
> function qdisc_tree_decrease_qlen net/sched/sch_api.c:769 whenever I use
> Transmission BitTorrent client.
>
> On the Grsecurity forum I was told it's probably an unintended integer
> underflow that I should report upstream.
>
> Here's the relevant log:
> https://gist.github.com/cf54ccbb12ea65e146d4
>

Looks like we miss some sch->q.qlen accounting somewhere...

What is your qdisc setup? Is your fq_codel the default one or you installed it
or some other qdisc somewhere (`tc qdisc show` could tell)?

I will take a deeper look tomorrow, or maybe Jamal could find something
before I wake up. ;)
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