From: Ian Rogers <irogers@google.com>
Date: Thu, 24 Jul 2025 16:32:42 +0000 (-0700)
Subject: perf build-id: Truncate to avoid overflowing the build_id data
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5a2ceebd8175874ae0e91a304ad6600d82806973;p=users%2Fjedix%2Flinux-maple.git

perf build-id: Truncate to avoid overflowing the build_id data

Warning when the build_id data would be overflowed would lead to
memory corruption, switch to truncation.

Signed-off-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250724163302.596743-3-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---

diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index e763e8d99a436..5bc2040bdd0d9 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -951,7 +951,10 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
 
 void build_id__init(struct build_id *bid, const u8 *data, size_t size)
 {
-	WARN_ON(size > BUILD_ID_SIZE);
+	if (size > BUILD_ID_SIZE) {
+		pr_debug("Truncating build_id size from %zd\n", size);
+		size = BUILD_ID_SIZE;
+	}
 	memcpy(bid->data, data, size);
 	bid->size = size;
 }