selftests/bpf: Add verifier tests for bpf_lookup_*_key() and bpf_key_put()
Add verifier tests for bpf_lookup_*_key() and bpf_key_put(), to ensure that acquired key references stored in the bpf_key structure are released, that a non-NULL bpf_key pointer is passed to bpf_key_put(), and that key references are not leaked. Also, slightly modify test_verifier.c, to find the BTF ID of the attach point for the LSM program type (currently, it is done only for TRACING). Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20220920075951.929132-11-roberto.sassu@huaweicloud.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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