selftests/bpf: Add a test for ptr_to_map_value on stack for helper access
Change bpf_iter_task.c such that pointer to map_value may appear on the stack for bpf_seq_printf() to access. Without previous verifier patch, the bpf_iter test will fail. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20201210013350.943985-1-yhs@fb.com
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