perf synthetic-events: Fix bounds and union member access in mmap2 build_id synthesis

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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>

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Ian Rogers 2026-07-21 16:52:54 -07:00 • committed by Namhyung Kim

parent b97c535768

commit 006a6f0f6e

1 changed files with 12 additions and 8 deletions

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tools/perf/util/synthetic-events.c

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