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

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Message-ID: <CAK8P3a2r+wjJH3NsHf8XDBRhkbyc_HAbNtizO3L-Us+8_JC2bw@mail.gmail.com>
Date:   Tue, 23 Mar 2021 17:29:12 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     "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 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() ;-)

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

       Arnd