netdev - Re: [PATCH 5.4 096/156] net: sched: sch: Bounds check priority

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Date:   Tue, 21 Feb 2023 10:12:16 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, patches@...ts.linux.dev,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        Simon Horman <simon.horman@...igine.com>,
        Cong Wang <cong.wang@...edance.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.4 096/156] net: sched: sch: Bounds check priority

On Tue, 2023-02-21 at 09:41 +0100, Greg Kroah-Hartman wrote:
> On Tue, Feb 21, 2023 at 08:45:18AM +0100, Paolo Abeni wrote:
> > Hello,
> > 
> > On Mon, 2023-02-20 at 14:35 +0100, Greg Kroah-Hartman wrote:
> > > From: Kees Cook <keescook@...omium.org>
> > > 
> > > [ Upstream commit de5ca4c3852f896cacac2bf259597aab5e17d9e3 ]
> > > 
> > > Nothing was explicitly bounds checking the priority index used to access
> > > clpriop[]. WARN and bail out early if it's pathological. Seen with GCC 13:
> > > 
> > > ../net/sched/sch_htb.c: In function 'htb_activate_prios':
> > > ../net/sched/sch_htb.c:437:44: warning: array subscript [0, 31] is outside array bounds of 'struct htb_prio[8]' [-Warray-bounds=]
> > >   437 |                         if (p->inner.clprio[prio].feed.rb_node)
> > >       |                             ~~~~~~~~~~~~~~~^~~~~~
> > > ../net/sched/sch_htb.c:131:41: note: while referencing 'clprio'
> > >   131 |                         struct htb_prio clprio[TC_HTB_NUMPRIO];
> > >       |                                         ^~~~~~
> > > 
> > > Cc: Jamal Hadi Salim <jhs@...atatu.com>
> > > Cc: Cong Wang <xiyou.wangcong@...il.com>
> > > Cc: Jiri Pirko <jiri@...nulli.us>
> > > Cc: "David S. Miller" <davem@...emloft.net>
> > > Cc: Eric Dumazet <edumazet@...gle.com>
> > > Cc: Jakub Kicinski <kuba@...nel.org>
> > > Cc: Paolo Abeni <pabeni@...hat.com>
> > > Cc: netdev@...r.kernel.org
> > > Signed-off-by: Kees Cook <keescook@...omium.org>
> > > Reviewed-by: Simon Horman <simon.horman@...igine.com>
> > > Reviewed-by: Cong Wang <cong.wang@...edance.com>
> > > Link: https://lore.kernel.org/r/20230127224036.never.561-kees@kernel.org
> > > Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> > > Signed-off-by: Sasha Levin <sashal@...nel.org>
> > 
> > This one has a follow-up which I don't see among the patches reaching
> > the netdev ML:
> > 
> > commit 9cec2aaffe969f2a3e18b5ec105fc20bb908e475
> > Author: Dan Carpenter <error27@...il.com>
> > Date:   Mon Feb 6 16:18:32 2023 +0300
> > 
> >     net: sched: sch: Fix off by one in htb_activate_prios()
> 
> This too is in the queue for 5.4 and newer kernels, are you sure you
> didn't miss that in this series?

I missed it, sorry. I checked only my inbox and netdev, and it was not
there, but I see it in the stable queue.

Sorry for the noise,

Paolo