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=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, URIBL_BLOCKED,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 DA69DC43381 for ; Wed, 27 Mar 2019 19:03:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AA3F9206B7 for ; Wed, 27 Mar 2019 19:03:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553713393; bh=4m2YY3kKOHnRfOoNKZbWa4BUpwdbHMSSTVOkdf7tzZg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=UcELu8E6An41pvYaDBKEcqI7IDHe6MxpFuVysJr5FOXsEVCKj4jkpGbN76JfNgIIY kBJZc8C44VROMdkMt0ieJ1Z+gIEUlBJ5xYLUwQ1QDk2rdcWSzFq5GdGmtIxjy1x/Fi H1pNfc5vC6MUKZzZnGynSCZ0JF3Kvfz/HJnwrce4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389964AbfC0TDM (ORCPT ); Wed, 27 Mar 2019 15:03:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:56140 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389137AbfC0SN1 (ORCPT ); Wed, 27 Mar 2019 14:13:27 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C4E9E2054F; Wed, 27 Mar 2019 18:13:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553710407; bh=4m2YY3kKOHnRfOoNKZbWa4BUpwdbHMSSTVOkdf7tzZg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gJX3DWaNUDTyblx68s3xTkkVLV6C146zjVpk+T3EbOZBT93muqrUDDwgPLv+Z5AJg gDC9DFq+5XmsCtQQwL5smIcgskPX1JFECrVA+iYxz0wfadPjDVG8LIB7s/rTD+f9EY EIWLlbIQTwlbbPAF/413WbAcBjg7PUILap6ysBFU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Masami Hiramatsu , Alexander Shishkin , Andrea Righi , Arnaldo Carvalho de Melo , Jiri Olsa , Linus Torvalds , Mathieu Desnoyers , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL 4.19 105/192] kprobes: Prohibit probing on RCU debug routine Date: Wed, 27 Mar 2019 14:08:57 -0400 Message-Id: <20190327181025.13507-105-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190327181025.13507-1-sashal@kernel.org> References: <20190327181025.13507-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu [ Upstream commit a39f15b9644fac3f950f522c39e667c3af25c588 ] Since kprobe itself depends on RCU, probing on RCU debug routine can cause recursive breakpoint bugs. Prohibit probing on RCU debug routines. int3 ->do_int3() ->ist_enter() ->RCU_LOCKDEP_WARN() ->debug_lockdep_rcu_enabled() -> int3 Signed-off-by: Masami Hiramatsu Cc: Alexander Shishkin Cc: Andrea Righi Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/154998807741.31052.11229157537816341591.stgit@devbox Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/rcu/update.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c index 39cb23d22109..81688a133552 100644 --- a/kernel/rcu/update.c +++ b/kernel/rcu/update.c @@ -52,6 +52,7 @@ #include #include #include +#include #define CREATE_TRACE_POINTS @@ -253,6 +254,7 @@ 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? -- 2.19.1