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 98F5FC282C4 for ; Tue, 12 Feb 2019 16:15:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 598EF2184E for ; Tue, 12 Feb 2019 16:15:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549988159; bh=DYYuFTFbws882p5tVP8bYyLy2Iu9FrDbZAXtF45aXSM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vKG61FlqXZJjvuJKg85ZMntbSpvNf4BXnnLvqwy3uE2rrcCvKt3zM7WdXkE/NQumb r45jnxaWIJxwXdKCGQDLLx8aPYdi9hTudKsw5Z3VgTmV3A6KRQ7/N01P2IIcZArb3E Tr0uFbR6i4GJea39wJSyACKQYM15wWZ6i6jKTR2A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731032AbfBLQP5 (ORCPT ); Tue, 12 Feb 2019 11:15:57 -0500 Received: from mail.kernel.org ([198.145.29.99]:45202 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728869AbfBLQP5 (ORCPT ); Tue, 12 Feb 2019 11:15:57 -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 162FE21773; Tue, 12 Feb 2019 16:15:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549988157; bh=DYYuFTFbws882p5tVP8bYyLy2Iu9FrDbZAXtF45aXSM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RFt1SS6vRamDdRG55Io9eT0q1xQO2pHfkP3vzTC7Mt5hwWp4O/ORVfunbCsDP5i0o sdS02sQK8RRcxUvyK1kVFXFwKMlSfrQlf+aapBTdWRM68EyLZqbi55WgieWdqzqhAf OiMP1UKzsCXY91ELl6cyTIk4yAkhv7cSFN80WJL4= From: Masami Hiramatsu To: Ingo Molnar Cc: Masami Hiramatsu , peterz@infradead.org, Mathieu Desnoyers , linux-kernel , Andrea Righi , Steven Rostedt Subject: [PATCH -tip v3 10/10] kprobes: Prohibit probing on bsearch() Date: Wed, 13 Feb 2019 01:15:34 +0900 Message-Id: <154998813406.31052.8791425358974650922.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 From: Andrea Righi 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 --- 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);