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Modify bounds and union member access in mmap2 build_id synthesis. Bound max_filename_len against the minimum of filename array capacity and the outer union stack layout minus sample ID trailers. This prevents both -E2BIG overruns and _FORTIFY_SOURCE array bounds aborts on strlcpy even if the enclosing union expands. Assisted-by: Antigravity:gemini-3.5-flash Signed-off-by: Ian Rogers <irogers@google.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>