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

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Date:   Wed, 16 Mar 2022 01:09:56 +0000
From:   "liujian (CE)" <liujian56@...wei.com>
To:     Martin KaFai Lau <kafai@...com>
CC:     "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "songliubraving@...com" <songliubraving@...com>,
        "yhs@...com" <yhs@...com>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "kpsingh@...nel.org" <kpsingh@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "sdf@...gle.com" <sdf@...gle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...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



> -----Original Message-----
> From: Martin KaFai Lau [mailto:kafai@...com]
> Sent: Wednesday, March 16, 2022 3:58 AM
> To: liujian (CE) <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 ?
I use sockmap with strparser, the stm->strp.offset (the begin of one application layer protocol message) maybe beyond 0xffff, but i need load the message head to do something.