resolve_btfids: Enforce consistent kfunc flags across BTF ID sets

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A kfunc may be listed in several BTF ID sets, which is expected
because different kfuncs are available to BPF programs depending on
their type.

However kfunc flags across different BTF ID sets must be consistent [1].
The flags should be considered a part of the kfunc declaration,
because they influence its BTF representation and verifier handling.

Enforce the kfunc flag consistency in resolve_btifds by hard failing
on error and blocking kernel (or module) build.

[1] https://lore.kernel.org/bpf/9b2196dd-443b-4632-ae11-030cdbdc59b4@linux.dev/

Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260722233518.778854-9-ihor.solodrai@linux.dev

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Ihor Solodrai 2026-07-22 16:35:18 -07:00 • committed by Andrii Nakryiko

parent f9f60d41ba

commit 140a3479ef

1 changed files with 13 additions and 4 deletions

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tools/bpf/resolve_btfids/main.c

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