selftests/bpf: Test module kfunc calls under spin lock

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The verifier uses kfunc registration flags to decide whether a kfunc may
be called while a BPF program holds a bpf_spin_lock.

Mark bpf_testmod_test_mod_kfunc() as KF_SPINLOCK_SAFE and verify that it
can be called while holding a bpf_spin_lock. Also attempt to call the
unmarked bpf_kfunc_trigger_ctx_check() under the lock and verify that the
program is rejected.

Signed-off-by: Kaitao Cheng <chengkaitao@kylinos.cn>
Acked-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/bpf/20260805153340.34776-4-kaitao.cheng@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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Kaitao Cheng 2026-08-05 23:33:40 +08:00 • committed by Kumar Kartikeya Dwivedi

parent 7619a0ee93

commit bca83aa31f

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2

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

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12

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

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

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tools/testing/selftests/bpf/test_kmods/bpf_testmod.c

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