selftests: Add selftest for disallowing modify_return attachment to freplace

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This adds a selftest that ensures that modify_return tracing programs
cannot be attached to freplace programs. The security_ prefix is added to
the freplace program because that would otherwise let it pass the check for
modify_return.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/160138355713.48470.3811074984255709369.stgit@toke.dk

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Toke Høiland-Jørgensen 2020-09-29 14:45:57 +02:00 • committed by Alexei Starovoitov

parent 17d3f38675

commit bee4b7e626

3 changed files with 71 additions and 1 deletions

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56

tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c

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14

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

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2

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

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