From: Eric Dumazet <eric.dumazet@gmail.com>
To: Daniele Fucini <dfucini@gmail.com>
Cc: Cong Wang <cwang@twopensource.com>,
netdev <netdev@vger.kernel.org>,
Jamal Hadi Salim <jhs@mojatatu.com>,
David Miller <davem@davemloft.net>,
spender@grsecurity.net, pageexec@freemail.hu, re.emese@gmail.com
Subject: Re: size overflow in function qdisc_tree_decrease_qlen net/sched/sch_api.c
Date: Tue, 01 Dec 2015 06:06:47 -0800 [thread overview]
Message-ID: <1448978807.25582.19.camel@edumazet-glaptop2.roam.corp.google.com> (raw)
In-Reply-To: <20151201111943.GA4036@Fux-PC>
On Tue, 2015-12-01 at 12:19 +0100, Daniele Fucini wrote:
> Thanks for the reply. Here's the output of `tc qdisc show`:
> https://gist.github.com/1847102c8fe08f63e9e7
>
> Daniele
>
>
> On Mon, Nov 30, 2015 at 08:50:29PM -0800, Cong Wang wrote:
> > On Mon, Nov 30, 2015 at 5:00 PM, Daniele Fucini <dfucini@gmail.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. ;)
Hmm... I do not think we ever took care of MQ in
qdisc_tree_decrease_qlen()
next prev parent reply other threads:[~2015-12-01 14:06 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-01 1:00 size overflow in function qdisc_tree_decrease_qlen net/sched/sch_api.c Daniele Fucini
2015-12-01 4:50 ` Cong Wang
2015-12-01 11:19 ` Daniele Fucini
2015-12-01 14:06 ` Eric Dumazet [this message]
2015-12-01 14:10 ` Eric Dumazet
2015-12-01 16:13 ` PaX Team
2015-12-01 16:34 ` Eric Dumazet
2015-12-01 18:43 ` Cong Wang
2015-12-01 19:09 ` Eric Dumazet
2015-12-01 19:17 ` Cong Wang
2015-12-01 20:06 ` Eric Dumazet
2015-12-01 22:33 ` Eric Dumazet
2015-12-01 22:47 ` Cong Wang
2015-12-01 23:10 ` Eric Dumazet
2015-12-02 4:08 ` [PATCH net] net_sched: fix qdisc_tree_decrease_qlen() races Eric Dumazet
2015-12-03 19:59 ` David Miller
2015-12-01 22:40 ` size overflow in function qdisc_tree_decrease_qlen net/sched/sch_api.c Cong Wang
2015-12-01 14:15 ` Eric Dumazet
2015-12-01 19:13 ` Daniele Fucini
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