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Add selftest cases that validate bpftool's expected behavior when accessing maps protected from modification via security_bpf_map. The test includes a BPF program attached to security_bpf_map with two maps: - A protected map that only allows read-only access - An unprotected map that allows full access The test script attaches the BPF program to security_bpf_map and verifies that for the bpftool map command: - Read access works on both maps - Write access fails on the protected map - Write access succeeds on the unprotected map - These behaviors remain consistent when the maps are pinned Signed-off-by: Slava Imameev <slava.imameev@crowdstrike.com> Reviewed-by: Quentin Monnet <qmo@kernel.org> Link: https://lore.kernel.org/r/20250620151812.13952-2-slava.imameev@crowdstrike.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>