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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 79B1DC282CE for ; Wed, 24 Apr 2019 17:17:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4857C21905 for ; Wed, 24 Apr 2019 17:17:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126254; bh=QspD3OEHvahxz8M5azcgKQFBPNYfoaRr3RMuD42XjzU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=IxNacX0xuwQu0E+U5BDlJE2vru/ut6pvqaZDwlY7CEyAopN1HoDqZQi9QlKFKIyRJ nQ3arKjfSyLMMALQN9wz7wVl/MQQNYuJBJTzzUK04E1kD2mZnR+B92uYLnPcbrT4/B BQHQOhvOW6PiC0GIdNkzJIUVIujToJHc8CjEdLz4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388656AbfDXRRd (ORCPT ); Wed, 24 Apr 2019 13:17:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:42436 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388647AbfDXRRb (ORCPT ); Wed, 24 Apr 2019 13:17:31 -0400 Received: from localhost (62-193-50-229.as16211.net [62.193.50.229]) (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 5695121907; Wed, 24 Apr 2019 17:17:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556126250; bh=QspD3OEHvahxz8M5azcgKQFBPNYfoaRr3RMuD42XjzU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x4GID430EUHlrHW57UUY/pl5mXgB0nmUfMnhoMHJPWAqKpDJS6nZGpB6xMbTkyB0b mnXp6njuFAsWCmriPbHo7ejgZLTV6QlBcszSTTwi3iM3XeMunzx/Q+9iSTBHT2UEon nOUdQwlHfGajbdXXrPcyLBqVI710bnB5JpfITPKk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Andrea Righi , Masami Hiramatsu , Alexander Shishkin , Arnaldo Carvalho de Melo , Jiri Olsa , Linus Torvalds , Mathieu Desnoyers , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 4.4 043/168] kprobes: Prohibit probing on bsearch() Date: Wed, 24 Apr 2019 19:08:07 +0200 Message-Id: <20190424170926.351880840@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190424170923.452349382@linuxfoundation.org> References: <20190424170923.452349382@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ 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 e33c179089db..d50048446b77 100644 --- a/lib/bsearch.c +++ b/lib/bsearch.c @@ -11,6 +11,7 @@ #include #include +#include /* * bsearch - binary search an array of elements @@ -51,3 +52,4 @@ 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