selftests/bpf: Test returning referenced kptr from struct_ops programs

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Test struct_ops programs returning referenced kptr. When the return type
of a struct_ops operator is pointer to struct, the verifier should
only allow programs that return a scalar NULL or a non-local kptr with the
correct type in its unmodified form.

Signed-off-by: Amery Hung <amery.hung@bytedance.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20250217190640.1748177-6-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Amery Hung 2025-02-17 11:06:40 -08:00 • committed by Alexei Starovoitov

parent 8d9f547f74

commit af17bad9fb

8 changed files with 173 additions and 0 deletions

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16

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

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30

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

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

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

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

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

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

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4

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

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