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Add selftests to verify that it is possible to load freplace program from user namespace if BPF token is initialized by bpf_object__prepare before calling bpf_program__set_attach_target. Negative test is added as well. Modified type of the priv_prog to xdp, as kprobe did not work on aarch64 and s390x. Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/bpf/20250317174039.161275-5-mykyta.yatsenko5@gmail.com