[PATCH] tracing/probes: Ensure the uprobe buffer size is bigger than event size
From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Date: 2026-05-11 10:03:56
Also in:
lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
From: Masami Hiramatsu (Google) <mhiramat@kernel.org> Add BUILD_BUG_ON() to ensure the uprobe per-CPU working buffer size is bigger than the event size. Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> --- 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;