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The BPF verifier was recently updated to treat pointers to struct types returned from BPF kfuncs as implicitly trusted by default. Add a new test case to exercise this new implicit trust semantic. The KF_ACQUIRE flag was dropped from the bpf_get_root_mem_cgroup() kfunc because it returns a global pointer to root_mem_cgroup without performing any explicit reference counting. This makes it an ideal candidate to verify the new implicit trusted pointer semantics. Signed-off-by: Matt Bobrowski <mattbobrowski@google.com> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20260113083949.2502978-3-mattbobrowski@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>