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 5D75DC43381 for ; Wed, 27 Mar 2019 18:22:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24DBD2087C for ; Wed, 27 Mar 2019 18:22:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553710925; bh=840THv+UwAh/DMlXBEC9mMy5QzhoIUtVLdHZt6lu8Ug=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FrlWY8Ep9a/n8bRQHbMnlVre3W5V7xvRDo3O+lroOCupOzfwBttWFG7jOaVx5yQqN 5zLTbhCjXbv1KzR3kJfo92SmVPJj12bEBUnhptn4UpufQjRt6HDxfo+iJjrE0FNE3d z4iB2flxTQ9hgI2uJ13+sw7QpZJ9B+YGjzYbFovQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403814AbfC0SWD (ORCPT ); Wed, 27 Mar 2019 14:22:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:40050 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403811AbfC0SWD (ORCPT ); Wed, 27 Mar 2019 14:22:03 -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 420BD20643; Wed, 27 Mar 2019 18:22:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1553710922; bh=840THv+UwAh/DMlXBEC9mMy5QzhoIUtVLdHZt6lu8Ug=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PzvMTef8yhpm/6Fg2eVWDLO8tTwKE36onGHrT6kNgNdukhsEExLTVDGq+6akckae8 cmvCKGrLxuv4Wvu7GQvKnKtN2kG96z7LN22MSO91ni7LW9qcnRxGrDMd0Fyy62pSnQ pPODTkKRWlh+s2xp5bzPdTsUQXjReF7gVXm7/89Q= 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 4.9 48/87] kprobes: Prohibit probing on bsearch() Date: Wed, 27 Mar 2019 14:20:01 -0400 Message-Id: <20190327182040.17444-48-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190327182040.17444-1-sashal@kernel.org> References: <20190327182040.17444-1-sashal@kernel.org> MIME-Version: 1.0 X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 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