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

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Subject: Re: [PATCH bpf-next] net: Use skb->len to check the validity of the parameters in bpf_skb_load_bytes
From: Martin KaFai Lau <kafai@xxxxxx>
Date: Tue, 15 Mar 2022 12:58:22 -0700
Cc: ast@xxxxxxxxxx, daniel@xxxxxxxxxxxxx, andrii@xxxxxxxxxx, songliubraving@xxxxxx, yhs@xxxxxx, john.fastabend@xxxxxxxxx, kpsingh@xxxxxxxxxx, davem@xxxxxxxxxxxxx, kuba@xxxxxxxxxx, sdf@xxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, bpf@xxxxxxxxxxxxxxx
In-reply-to: <20220315123916.110409-1-liujian56@huawei.com>

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 ?

Follow-Ups:
- RE: [PATCH bpf-next] net: Use skb->len to check the validity of the parameters in bpf_skb_load_bytes
  - From: liujian (CE)

References:
- [PATCH bpf-next] net: Use skb->len to check the validity of the parameters in bpf_skb_load_bytes
  - From: Liu Jian

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