linux-kernel - Re: [RFC net] net: skbuff: fix stack variable out of bounds access

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Message-ID: <CA+FuTScvHD4fTfhzd42hPk_bLPUk0GtbVtq-TZ0=RQerztipBQ@mail.gmail.com>
Date:   Tue, 23 Mar 2021 13:14:51 -0400
From:   Willem de Bruijn <willemdebruijn.kernel@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexander Lobakin <alobakin@...me>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Guillaume Nault <gnault@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [RFC net] net: skbuff: fix stack variable out of bounds access

On Tue, Mar 23, 2021 at 12:30 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> On Tue, Mar 23, 2021 at 3:42 PM Willem de Bruijn
> <willemdebruijn.kernel@...il.com> wrote:
> >
> > On Tue, Mar 23, 2021 at 8:52 AM Arnd Bergmann <arnd@...nel.org> wrote:
> > >>
> > A similar fix already landed in 5.12-rc3: commit b228c9b05876 ("net:
> > expand textsearch ts_state to fit skb_seq_state"). That fix landed in
> > 5.12-rc3.
>
> Ah nice, even the same BUILD_BUG_ON() ;-)

Indeed :) Sorry that your work ended up essentially reproducing that.

> Too bad it had to be found through runtime testing when it could have been
> found by the compiler warning.

Definitely useful. Had I enabled it, it would have saved me a lot of debug time.