selftests/bpf: Test bpf_refcount_acquire of node obtained via direct ld

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This patch demonstrates that verifier changes earlier in this series
result in bpf_refcount_acquire(mapval->stashed_kptr) passing
verification. The added test additionally validates that stashing a kptr
in mapval and - in a separate BPF program - refcount_acquiring the kptr
without unstashing works as expected at runtime.

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/r/20231107085639.3016113-7-davemarchevsky@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Dave Marchevsky 2023-11-07 00:56:39 -08:00 • committed by Alexei Starovoitov

parent 1b12171533

commit e9ed8df718

2 changed files with 104 additions and 0 deletions

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33

tools/testing/selftests/bpf/prog_tests/local_kptr_stash.c

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71

tools/testing/selftests/bpf/progs/local_kptr_stash.c

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