From: "liujian (CE)" <liujian56@huawei.com>
To: Martin KaFai Lau <kafai@fb.com>
Cc: "ast@kernel.org" <ast@kernel.org>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"andrii@kernel.org" <andrii@kernel.org>,
"songliubraving@fb.com" <songliubraving@fb.com>,
"yhs@fb.com" <yhs@fb.com>,
"john.fastabend@gmail.com" <john.fastabend@gmail.com>,
"kpsingh@kernel.org" <kpsingh@kernel.org>,
"davem@davemloft.net" <davem@davemloft.net>,
"kuba@kernel.org" <kuba@kernel.org>,
"sdf@google.com" <sdf@google.com>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"bpf@vger.kernel.org" <bpf@vger.kernel.org>
Subject: RE: [PATCH bpf-next] net: Use skb->len to check the validity of the parameters in bpf_skb_load_bytes
Date: Wed, 16 Mar 2022 01:09:56 +0000 [thread overview]
Message-ID: <4f937ace70a3458580c6242fa68ea549@huawei.com> (raw)
In-Reply-To: <20220315195822.sonic5avyizrufsv@kafai-mbp.dhcp.thefacebook.com>
> -----Original Message-----
> From: Martin KaFai Lau [mailto:kafai@fb.com]
> Sent: Wednesday, March 16, 2022 3:58 AM
> To: liujian (CE) <liujian56@huawei.com>
> Cc: ast@kernel.org; daniel@iogearbox.net; andrii@kernel.org;
> songliubraving@fb.com; yhs@fb.com; john.fastabend@gmail.com;
> kpsingh@kernel.org; davem@davemloft.net; kuba@kernel.org;
> sdf@google.com; netdev@vger.kernel.org; bpf@vger.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.
next prev parent reply other threads:[~2022-03-16 1:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-15 12:39 [PATCH bpf-next] net: Use skb->len to check the validity of the parameters in bpf_skb_load_bytes Liu Jian
2022-03-15 19:58 ` Martin KaFai Lau
2022-03-16 1:09 ` liujian (CE) [this message]
2022-03-16 4:00 ` John Fastabend
2022-03-16 13:08 ` liujian (CE)
2022-03-16 15:09 ` Stanislav Fomichev
2022-03-17 14:08 ` liujian (CE)
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