netdev - Re: [PATCH net-next] net: Fix incorrect address comparison when searching for a bind2 bucket

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Message-ID: <CANn89iJt4JjfmauHGrxeKGjY84Z1Gt1Feao6NwU9AFfSQRW9eg@mail.gmail.com>
Date:   Tue, 27 Sep 2022 22:07:08 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
Cc:     netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        kernel-team <kernel-team@...com>,
        Paolo Abeni <pabeni@...hat.com>,
        Joanne Koong <joannelkoong@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Martin KaFai Lau <martin.lau@...nel.org>
Subject: Re: [PATCH net-next] net: Fix incorrect address comparison when
 searching for a bind2 bucket

On Tue, Sep 27, 2022 at 9:46 PM Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>
> On 9/27/22 8:49 PM, Eric Dumazet wrote:
> > On Mon, Sep 26, 2022 at 5:25 PM Martin KaFai Lau <kafai@...com> wrote:
> >>
> >> From: Martin KaFai Lau <martin.lau@...nel.org>
> >>
> >> The v6_rcv_saddr and rcv_saddr are inside a union in the
> >> 'struct inet_bind2_bucket'.  When searching a bucket by following the
> >> bhash2 hashtable chain, eg. inet_bind2_bucket_match, it is only using
> >> the sk->sk_family and there is no way to check if the inet_bind2_bucket
> >> has a v6 or v4 address in the union.  This leads to an uninit-value
> >> KMSAN report in [0] and also potentially incorrect matches.
> >
> > I do not see the KMSAN report, is it missing from this changelog ?
>
> My bad. Forgot to paste the link in the commit message.  It is here:
>
> https://lore.kernel.org/netdev/CAG_fn=Ud3zSW7AZWXc+asfMhZVL5ETnvuY44Pmyv4NPv-ijN-A@mail.gmail.com/

I see, thanks.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>