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=-9.1 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 31DC1C282C4 for ; Tue, 12 Feb 2019 16:15:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0207D2184E for ; Tue, 12 Feb 2019 16:15:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549988104; bh=Xv5OzXSHjGSc0XjZHsImy5SwDPRNMpFpsQfpnURglKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JQCZAQT/j9yY5nnyOy/hrbwpvKOxvveun7qDbRmngmdVLhEBX2JpmT6SMnxzc9YMs 4zYWkWu4zFO7kt99h97gpZw0w/Ej0FMtqhWGAtHToSZbWnDFTPAZLNZDYDHk6YMbAK 7zmpoYWKrD9t6Uq/zNjf8QxKPRIGScAREuIbZoNo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730982AbfBLQPB (ORCPT ); Tue, 12 Feb 2019 11:15:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:43348 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730301AbfBLQPA (ORCPT ); Tue, 12 Feb 2019 11:15:00 -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 606EC21773; Tue, 12 Feb 2019 16:14:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549988100; bh=Xv5OzXSHjGSc0XjZHsImy5SwDPRNMpFpsQfpnURglKA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f4ZhZ47R1zi/Iq36B7tHASuS0xrDSB9K2U70RbAb7WkGBcBe4L1IojSf3LsQQ0lWU WL3QAG0MW/GN1X/+U73EmEaK3TwrLQ+g5IMjsS3eftUeXUCkAU1wKA8H/sgRod0u4/ O2ZbLNVaBP7OQ6zNX8c4waAdBUe5MySbsjpM4XmE= From: Masami Hiramatsu To: Ingo Molnar Cc: Masami Hiramatsu , peterz@infradead.org, Mathieu Desnoyers , linux-kernel , Andrea Righi , Steven Rostedt Subject: [PATCH -tip v3 08/10] kprobes: Prohibit probing on RCU debug routine Date: Wed, 13 Feb 2019 01:14:37 +0900 Message-Id: <154998807741.31052.11229157537816341591.stgit@devbox> X-Mailer: git-send-email 2.13.6 In-Reply-To: <154998785011.31052.1475728497912659748.stgit@devbox> References: <154998785011.31052.1475728497912659748.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?