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In veristat tests replace direct read() calls with calls to read_output() utility function, which: - guarantees that the input buffer is zero terminated; - asserts that read operation succeeded. Signed-off-by: Eduard Zingerman <eddyz87@gmail.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260811-veristat-filter-fix-v2-3-6c234c4cd6ef@gmail.com