netdev - Re: [PATCH bpf 1/2] net: Enlarge offset check value from 0xffff to INT_MAX in bpf_skb_load

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Message-ID: <34CE6275-8394-4ACD-A914-DFDB51A65EF0@fb.com>
Date:   Mon, 11 Apr 2022 16:29:00 +0000
From:   Song Liu <songliubraving@...com>
To:     Liu Jian <liujian56@...wei.com>
CC:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <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 1/2] net: Enlarge offset check value from 0xffff to
 INT_MAX in bpf_skb_load_bytes



> On Apr 11, 2022, at 6:02 AM, Liu Jian <liujian56@...wei.com> wrote:
> 
> The data length of skb frags + frag_list may be greater than 0xffff,
> and skb_header_pointer can not handle negative offset and negative len.
> So here INT_MAX is used to check the validity of offset and len.
> Add the same change to the related function skb_store_bytes.
> 
> Fixes: 05c74e5e53f6 ("bpf: add bpf_skb_load_bytes helper")
> Signed-off-by: Liu Jian <liujian56@...wei.com>

Acked-by: Song Liu <songliubraving@...com>