From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 705D4C43387 for ; Sat, 12 Jan 2019 02:29:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 422B42177B for ; Sat, 12 Jan 2019 02:29:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547260192; bh=Xv5OzXSHjGSc0XjZHsImy5SwDPRNMpFpsQfpnURglKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=oa1Wt56UppE1x6y5TVcAcGJAAQP/TQAwrwDeitDmXFmLDCc2csAi8hBpNfHufpG1U r/1dNh9F776pmrH5R/FnPGe+wKLdK+pTTx77vP0bS/xh0Dk8wSt3iCvluQgGerEDK2 WGY4Voe/QrZsDruzqDKVv/5O4Gn6AYYTQxagY/YY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726635AbfALC3v (ORCPT ); Fri, 11 Jan 2019 21:29:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:48954 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726227AbfALC3u (ORCPT ); Fri, 11 Jan 2019 21:29:50 -0500 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4C315204FD; Sat, 12 Jan 2019 02:29:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547260190; bh=Xv5OzXSHjGSc0XjZHsImy5SwDPRNMpFpsQfpnURglKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PSzyP6CY8ujUfMLwFIjaBHoxlnG7yJt2S2DeFV3vxJTOzvA600s9Sr+kKzMAu4KmZ 6mSsZpBgzsBzHP/SNo4nCb+q/ewp5UwaTUNzIj467jFuPNUUoi+Fa22JEy3vqabf9B cxwJoqo+M84RidfntqqeXTbzu3Bs01y0GJmABsEk= From: Masami Hiramatsu To: Ingo Molnar Cc: Masami Hiramatsu , peterz@infradead.org, Mathieu Desnoyers , linux-kernel , Andrea Righi , Steven Rostedt Subject: [PATCH v2 8/9] kprobes: Prohibit probing on RCU debug routine Date: Sat, 12 Jan 2019 11:29:27 +0900 Message-Id: <154726016731.18060.5873805314873726998.stgit@devbox> X-Mailer: git-send-email 2.13.6 In-Reply-To: <154725993986.18060.2759150647140353514.stgit@devbox> References: <154725993986.18060.2759150647140353514.stgit@devbox> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Since kprobe itself depends on RCU, probing on RCU debug routine can cause recursive breakpoint problem. Prohibit probing on RCU debug routines. int3 ->do_int3() ->ist_enter() ->RCU_LOCKDEP_WARN() ->debug_lockdep_rcu_enabled() -> int3 Signed-off-by: Masami Hiramatsu --- kernel/rcu/update.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 1971869c4072..f4ca36d92138 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -52,6 +52,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS @@ -249,6 +250,7 @@ int notrace debug_lockdep_rcu_enabled(void) current->lockdep_recursion == 0; } EXPORT_SYMBOL_GPL(debug_lockdep_rcu_enabled); +NOKPROBE_SYMBOL(debug_lockdep_rcu_enabled); /** * rcu_read_lock_held() - might we be in RCU read-side critical section?