From 4304c8165281fe730b6861d37a30b567d3c57832 Mon Sep 17 00:00:00 2001 From: "Masami Hiramatsu (Google)" Date: Mon, 1 Jun 2026 23:35:21 +0900 Subject: [PATCH] tracing/probes: Ensure the uprobe buffer size is bigger than event size Add BUILD_BUG_ON() to ensure the uprobe per-CPU working buffer size is bigger than the event size. Link: https://lore.kernel.org/all/177849383209.8038.1902170479780501237.stgit@devnote2/ Signed-off-by: Masami Hiramatsu (Google) --- kernel/trace/trace_uprobe.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 2cabf8a23ec5..c5ee7920dec6 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -979,6 +979,7 @@ static struct uprobe_cpu_buffer *prepare_uprobe_buffer(struct trace_uprobe *tu, ucb = uprobe_buffer_get(); ucb->dsize = tu->tp.size + dsize; + BUILD_BUG_ON(MAX_UCB_BUFFER_SIZE < MAX_PROBE_EVENT_SIZE); if (WARN_ON_ONCE(ucb->dsize > MAX_UCB_BUFFER_SIZE)) { ucb->dsize = MAX_UCB_BUFFER_SIZE; dsize = MAX_UCB_BUFFER_SIZE - tu->tp.size;