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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 5D2B6C432C0 for ; Fri, 22 Nov 2019 10:32:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 340D720714 for ; Fri, 22 Nov 2019 10:32:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574418763; bh=k+zAYsoWvMmMxQVYUXNHmoxyfXwgy1E1ib5zhobtrJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FXqxew8B0Gd3AenM1map3vBZIp4duZ2yVUTNX0+9GAlHEdtkixCtXYemSOpQlcKeb 8p+ZsmAeADZ4pBuuAL/9qk0I4c5Fl2MSSLVVhlHqh98EcxSgX6upzNEXUMdcPs15h+ Hcff9bXL9TKgfhTuNmo6bZh/LACKSeaGrMTDyuoE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727762AbfKVKcm (ORCPT ); Fri, 22 Nov 2019 05:32:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:54374 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727747AbfKVKck (ORCPT ); Fri, 22 Nov 2019 05:32:40 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 42F382071C; Fri, 22 Nov 2019 10:32:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574418759; bh=k+zAYsoWvMmMxQVYUXNHmoxyfXwgy1E1ib5zhobtrJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vp+nEF8QmZlj0X9NbNef3h2GWJUH6jRZuo7j/8FTfOpMT1UWJ6KubW/WLFpbEUBDC bqO8ao/eP5O5r6DWcUFdKeE6gauSotmBMC5LjjmhHbp7KtzWPQlQMcrXgn/WpzwPqd abOLBNJoaC6HrnGhkzpsO9St0Cdx/JBaEowmNFkw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Masami Hiramatsu , Anil S Keshavamurthy , "David S . Miller" , Linus Torvalds , "Naveen N . Rao" , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 4.4 043/159] kprobes: Dont call BUG_ON() if there is a kprobe in use on free list Date: Fri, 22 Nov 2019 11:27:14 +0100 Message-Id: <20191122100737.054664317@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191122100704.194776704@linuxfoundation.org> References: <20191122100704.194776704@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 From: Masami Hiramatsu [ Upstream commit cbdd96f5586151e48317d90a403941ec23f12660 ] Instead of calling BUG_ON(), if we find a kprobe in use on free kprobe list, just remove it from the list and keep it on kprobe hash list as same as other in-use kprobes. Signed-off-by: Masami Hiramatsu Cc: Anil S Keshavamurthy Cc: David S . Miller Cc: Linus Torvalds Cc: Naveen N . Rao Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/153666126882.21306.10738207224288507996.stgit@devbox Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- kernel/kprobes.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/kernel/kprobes.c b/kernel/kprobes.c index fdde50d39a46d..f59f49bc2a5d5 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -514,8 +514,14 @@ static void do_free_cleaned_kprobes(void) struct optimized_kprobe *op, *tmp; list_for_each_entry_safe(op, tmp, &freeing_list, list) { - BUG_ON(!kprobe_unused(&op->kp)); list_del_init(&op->list); + if (WARN_ON_ONCE(!kprobe_unused(&op->kp))) { + /* + * This must not happen, but if there is a kprobe + * still in use, keep it on kprobes hash list. + */ + continue; + } free_aggr_kprobe(&op->kp); } } -- 2.20.1