bpf: Selftests, verifier case for non null pointer map value branch

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When we have pointer type that is known to be non-null we only follow
the non-null branch. This adds tests to cover the map_value pointer
returned from a map lookup. To force an error if both branches are
followed we do an ALU op on R10.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/159009168650.6313.7434084136067263554.stgit@john-Precision-5820-Tower

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John Fastabend 2020-05-21 13:08:06 -07:00 • committed by Alexei Starovoitov

parent c72b5cbb09

commit f9b16ec0ee

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tools/testing/selftests/bpf/verifier/value_or_null.c

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