Enlarge offset check value in bpf_skb_load_bytes #2855
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…d_bytes 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: 05c74e5 ("bpf: add bpf_skb_load_bytes helper") Signed-off-by: Liu Jian <liujian56@huawei.com> Acked-by: Song Liu <songliubraving@fb.com>
Use bpf_prog_test_run_opts to test the skb_load_bytes function. Tests the behavior when offset is greater than INT_MAX or a normal value. Signed-off-by: Liu Jian <liujian56@huawei.com>
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Pull request for series with
subject: Enlarge offset check value in bpf_skb_load_bytes
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=631069