netdev - Re: [PATCH bpf-next] net: Use skb->len to check the validity of the parameters in bpf_skb_load

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Message-ID: <20220315195822.sonic5avyizrufsv@kafai-mbp.dhcp.thefacebook.com>
Date:   Tue, 15 Mar 2022 12:58:22 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Liu Jian <liujian56@...wei.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, davem@...emloft.net, kuba@...nel.org,
        sdf@...gle.com, netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH bpf-next] net: Use skb->len to check the validity of the
 parameters in bpf_skb_load_bytes

On Tue, Mar 15, 2022 at 08:39:16PM +0800, Liu Jian wrote:
> The data length of skb frags + frag_list may be greater than 0xffff,
> so here use skb->len to check the validity of the parameters.
What is the use case that needs to look beyond 0xffff ?