selftests/bpf: Add test for key-less BTF hash map

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Create a hash and an rhash map with btf_key_type_id == 0 and expect
bpf_map_create() to fail with -EINVAL; a positive control with a real
key type confirms the rejection is about the key-less BTF and not some
unrelated failure.

Such a map used to be accepted and then NULL-deref in btf_type_show()
when dumped through bpffs.

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://lore.kernel.org/r/20260901104924.346187-5-jiayuan.chen@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Jiayuan Chen 2026-09-01 18:47:38 +08:00 • committed by Alexei Starovoitov

parent 5403a383f5

commit 6265b44f2c

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tools/testing/selftests/bpf/prog_tests/btf_map_keyless.c

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