From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF62D3242B2; Mon, 11 May 2026 10:03:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778493836; cv=none; b=AX7tTLX3VeVsD7mNwy5Wvhhro0sXzcXdlMxxmpINPwY1fbw9Vo0NhSwFIrF1Ud4ZcjAxIrT/tKEbMaJ6grWQZl2wwPtDGF/onJGfFJG6zIVkMHPEKuyRwRrHFb8xql/790sUQs0PdsqspgT3EXUfJXkT6An/f7jkkWYSjessFe0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778493836; c=relaxed/simple; bh=XmvQcE042Vhn0lpzYlIh9f2Zy0a0UeeqjxWYlJC+skM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=ZiNKApnNCcExgSZaCn0ikFanSPdzH4hRYMQc0kvRBa9Ja1F1cccfMFMhmp660Qc+58lA7eBH2t4YkyWxQdYot/fghgasUr/8UMbOlS8q8/mMGcOv2jBkLy7FVtE04ucQLJZxJNyLANcKjkoY2lZZNF0PJFBsbdkfJi0ICUD8vrY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=T0t5PrkP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="T0t5PrkP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A6D1C2BCB0; Mon, 11 May 2026 10:03:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778493835; bh=XmvQcE042Vhn0lpzYlIh9f2Zy0a0UeeqjxWYlJC+skM=; h=From:To:Cc:Subject:Date:From; b=T0t5PrkPVIlGBuNL++lSkza+N5BgGVPB9lTG3PLEiudYr1W1M1MpRfxuPwEkNHCC/ qPnQ10vg3oPi/Ta4kEWxjfwLWKTo/RoyLyFOFs5D0EazvC0neJBA1hNimCOMlYeUG/ Gn2Z0Wnlh9sj/+LG+wWsFyUL92nyBQI5aaELt2uskg+iPYm8ntfI5aXPHN40Jr/QU7 RKeH9s/pFQjPlFIrDoF9Ob8JMTHpcbqpi7qRg1D5hKiSbMcaV4KGCKPugDJ9jCSSqW plhE+3k1X14nMqhRIs1Mqq35jjXFHZcV2DivtiXT1YQDjjZgVJFajCEsMjkpF+Ke2T /ZMwus9j7cH/Q== From: "Masami Hiramatsu (Google)" To: Steven Rostedt , Masami Hiramatsu Cc: Mathieu Desnoyers , 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 Message-ID: <177849383209.8038.1902170479780501237.stgit@devnote2> X-Mailer: git-send-email 2.43.0 User-Agent: StGit/0.19 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: Masami Hiramatsu (Google) 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) --- 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;