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Now that bpf_map_lookup_elem() is white-listed for SOCKMAP/SOCKHASH, replace the tests which check that verifier prevents lookup on these map types with ones that ensure that lookup operation is permitted, but only with a release of acquired socket reference. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: John Fastabend <john.fastabend@gmail.com> Link: https://lore.kernel.org/bpf/20200429181154.479310-3-jakub@cloudflare.com