bpf: selftest: Add ref_tracking verifier test for bpf_skc casting

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The patch tests for:
1. bpf_sk_release() can be called on a tcp_sock btf_id ptr.

2. Ensure the tcp_sock btf_id pointer cannot be used
   after bpf_sk_release().

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Lorenz Bauer <lmb@cloudflare.com>
Link: https://lore.kernel.org/bpf/20200925000421.3857616-1-kafai@fb.com

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Martin KaFai Lau 2020-09-24 17:04:21 -07:00 • committed by Alexei Starovoitov

parent 27e5203bd9

commit 5d13746dd8

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tools/testing/selftests/bpf/verifier/ref_tracking.c

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