selftests/bpf: Reject non-percpu values in percpu kptr fields

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Add verifier coverage for the two ways a non-percpu pointer can be stored
in a __percpu_kptr field: a program-BTF local allocation returned by
bpf_obj_new(), and a referenced kernel-BTF task_struct pointer.

Without the verifier fix, both programs are unexpectedly accepted and the
negative tests fail. Requiring MEM_PERCPU makes both programs fail
verification with the expected invalid-kptr diagnostic.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Kumar Kartikeya Dwivedi 2026-09-04 10:43:15 +02:00 • committed by Alexei Starovoitov

parent 048029ba1c

commit 17487b31f4

1 changed files with 59 additions and 0 deletions

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

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