perf synthetic-events: Fix stack buffer overflow and bounds in cgroup synthesis

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Fix a pre-existing stack buffer overflow bug in
perf_event__synthesize_cgroup() where an in-place null padding loop wrote
bytes past the end of the cgrp_root stack array buffer during cgroup tree
traversal. Eliminate in-place path mutation, use PERF_ALIGN for path_len,
clamp raw_path_len to prevent sample ID header trailer overruns, and use
strlcpy with combined zero padding for alignment and sample ID headers.

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 16:52:52 -07:00 • committed by Namhyung Kim

parent 505a498a37

commit 093f58e60e

1 changed files with 13 additions and 6 deletions

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tools/perf/util/synthetic-events.c

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