selftests/bpf: add a test for overlapping packet range checks
add simple C test case for llvm and verifier range check fix from commit b1977682 ("bpf: improve verifier packet range checks") Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Acked-by: NDaniel Borkmann <daniel@iogearbox.net> Acked-by: NMartin KaFai Lau <kafai@fb.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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