bpf: Enforce 'return 0' in BTF-enabled raw_tp programs
The return value of raw_tp programs is ignored by __bpf_trace_run() that calls them. The verifier also allows any value to be returned. For BTF-enabled raw_tp lets enforce 'return 0', so that return value can be used for something in the future. Signed-off-by:Alexei Starovoitov <ast@kernel.org> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Acked-by:
Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20191029032426.1206762-1-ast@kernel.org
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a566e35f
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