From: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: [PATCH] tracing/probes: Ensure the uprobe buffer size is bigger than event size
Date: Mon, 11 May 2026 19:03:52 +0900 [thread overview]
Message-ID: <177849383209.8038.1902170479780501237.stgit@devnote2> (raw)
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;
reply other threads:[~2026-05-11 10:03 UTC|newest]
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