selftests/bpf: Add BTF fixup for __naked subprog parameter names

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When __naked subprogs are used in verifier tests, clang drops
parameter names from their BTF FUNC_PROTO entries. This prevents
the verifier from resolving stack argument slots by name.

Add a __btf_func_path(path) annotation that points to a separate
BTF file containing properly-named FUNC entries. The test_loader
matches FUNC entries by name, detects anonymous parameters, and
replaces the FUNC_PROTO with a new one that carries parameter
names from the custom file while preserving the original type IDs.

The custom BTF file also serves as btf_custom_path for kfunc
resolution when no separate btf_custom_path is specified.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260513045138.2398886-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Yonghong Song 2026-05-12 21:51:38 -07:00 • committed by Alexei Starovoitov

parent 9f42204c62

commit 5b31de8892

2 changed files with 136 additions and 1 deletions

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tools/testing/selftests/bpf/progs/bpf_misc.h

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136

tools/testing/selftests/bpf/test_loader.c

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