selftests/bpf: Add test for showing a void BTF type

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Extend the snprintf_btf test with type_ids from the vmlinux BTF that
used to NULL-deref in the BTF show path: a "const void", checked to
render the "<unsupported kind:0>" placeholder, and a BTF_KIND_VAR,
checked to resolve and render without error.

The program renders from its own buffer and the test picks a VAR whose
resolved type fits it, so the render stays in bounds.

Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Link: https://lore.kernel.org/r/20260901104924.346187-6-jiayuan.chen@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Jiayuan Chen 2026-09-01 18:47:39 +08:00 • committed by Alexei Starovoitov

parent 6265b44f2c

commit 1ae6aa6195

2 changed files with 103 additions and 0 deletions

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79

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

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24

tools/testing/selftests/bpf/progs/snprintf_btf_void.c

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