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bpf: selftests: Add selftests for module kfunc support

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This adds selftests that tests the success and failure path for modules
kfuncs (in presence of invalid kfunc calls) for both libbpf and
gen_loader. It also adds a prog_test kfunc_btf_id_list so that we can
add module BTF ID set from bpf_testmod.

This also introduces  a couple of test cases to verifier selftests for
validating whether we get an error or not depending on if invalid kfunc
call remains after elimination of unreachable instructions.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211002011757.311265-10-memxor@gmail.com
This commit is contained in:
Kumar Kartikeya Dwivedi 2021-10-02 06:47:57 +05:30 • committed by Alexei Starovoitov
parent 18f4fccbf3
commit c48e51c8b0
9 changed files with 132 additions and 31 deletions
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include/linux/btf.h
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@ -275,5 +275,6 @@ static inline bool bpf_check_mod_kfunc_call(struct kfunc_btf_id_list *klist,
THIS_MODULE }
extern struct kfunc_btf_id_list bpf_tcp_ca_kfunc_list;
extern struct kfunc_btf_id_list prog_test_kfunc_list;
#endif