netdev - Re: [PATCH bpf] bpf: net: Set sk_bpf_storage back to NULL for cloned sk

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Date:   Tue, 11 Jun 2019 21:46:28 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        Kernel Team <kernel-team@...com>
Subject: Re: [PATCH bpf] bpf: net: Set sk_bpf_storage back to NULL for cloned sk

On Tue, Jun 11, 2019 at 8:33 PM Martin KaFai Lau <kafai@...com> wrote:
>
> The cloned sk should not carry its parent-listener's sk_bpf_storage.
> This patch fixes it by setting it back to NULL.

Makes sense.

Acked-by: Andrii Nakryiko <andriin@...com>

>
> Fixes: 6ac99e8f23d4 ("bpf: Introduce bpf sk local storage")
> Signed-off-by: Martin KaFai Lau <kafai@...com>
> ---
>  net/core/sock.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/net/core/sock.c b/net/core/sock.c
> index 2b3701958486..d90fd04622e5 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -1850,6 +1850,9 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
>                         goto out;
>                 }
>                 RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL);
> +#ifdef CONFIG_BPF_SYSCALL
> +               RCU_INIT_POINTER(newsk->sk_bpf_storage, NULL);
> +#endif
>
>                 newsk->sk_err      = 0;
>                 newsk->sk_err_soft = 0;
> --
> 2.17.1
>