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 1382AC43381 for ; Wed, 27 Mar 2019 18:06:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0CF8217D9 for ; Wed, 27 Mar 2019 18:06:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553710006; bh=fRRvlS6BSlWJEOgJ6mK/HtJMXrjrzPEBnyi5d58cgt8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xiVNIOI32O7cNtPKMQaAfWwezTur9c0CX6jD0OW0P/gV9KpSrRaspi9CCdySNddiO 9tMlJPElzXC26HN99jv7skJ0TrXKQDQLcaTGyoSZks8sn9rR6UezzDXhAz37EF5BgD ZIFoz7fNWIjRBGRvcLRHPG/N1bOiovCkc1tSlHrA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388011AbfC0SGp (ORCPT ); Wed, 27 Mar 2019 14:06:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:48348 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387990AbfC0SGk (ORCPT ); Wed, 27 Mar 2019 14:06:40 -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 336942063F; Wed, 27 Mar 2019 18:06:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553709999; bh=fRRvlS6BSlWJEOgJ6mK/HtJMXrjrzPEBnyi5d58cgt8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GnZRYx3WPYpJh+9tj0hJrDwu5WzibX0Bzb/am21zGiDMAJTUxLxdkj0JFLZI9Kgax g8IbSlGVfZtJsPTkr3DbWim3FawGtcK7hrMSxZU/MDNhgy12aat4MhrHqPbXQOOwF7 9SjYj4ELJzDe7JzKCR1nqDtEtewVDiJNn0AwOT4U= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Andrea Righi , Alexander Shishkin , Arnaldo Carvalho de Melo , Jiri Olsa , Linus Torvalds , Mathieu Desnoyers , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH AUTOSEL 5.0 150/262] kprobes: Prohibit probing on bsearch() Date: Wed, 27 Mar 2019 14:00:05 -0400 Message-Id: <20190327180158.10245-150-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190327180158.10245-1-sashal@kernel.org> References: <20190327180158.10245-1-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: Andrea Righi [ Upstream commit 02106f883cd745523f7766d90a739f983f19e650 ] Since kprobe breakpoing handler is using bsearch(), probing on this routine can cause recursive breakpoint problem. int3 ->do_int3() ->ftrace_int3_handler() ->ftrace_location() ->ftrace_location_range() ->bsearch() -> int3 Prohibit probing on bsearch(). Signed-off-by: Andrea Righi Acked-by: Masami Hiramatsu Cc: Alexander Shishkin 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/154998813406.31052.8791425358974650922.stgit@devbox Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- lib/bsearch.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/bsearch.c b/lib/bsearch.c index 18b445b010c3..82512fe7b33c 100644 --- a/lib/bsearch.c +++ b/lib/bsearch.c @@ -11,6 +11,7 @@ #include #include +#include /* * bsearch - binary search an array of elements @@ -53,3 +54,4 @@ void *bsearch(const void *key, const void *base, size_t num, size_t size, return NULL; } EXPORT_SYMBOL(bsearch); +NOKPROBE_SYMBOL(bsearch); -- 2.19.1