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If the bpf program contains out of bound access w.r.t. a particular map key/value size, the verification will be still okay, e.g., it will be accepted by verifier. But it will be rejected during link_create time. A test is added here to ensure link_create failure did happen if out of bound access happened. $ ./test_progs -n 4 ... #4/23 rdonly-buf-out-of-bound:OK ... Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200723184124.591700-1-yhs@fb.com