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=-9.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 C8393C43468 for ; Sat, 19 Sep 2020 04:20:25 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4D5B0221EC for ; Sat, 19 Sep 2020 04:20:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="EggG7EyV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4D5B0221EC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 420496B006E; Sat, 19 Sep 2020 00:20:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 35AED6B0070; Sat, 19 Sep 2020 00:20:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1845F6B0071; Sat, 19 Sep 2020 00:20:24 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0163.hostedemail.com [216.40.44.163]) by kanga.kvack.org (Postfix) with ESMTP id 027486B006E for ; Sat, 19 Sep 2020 00:20:23 -0400 (EDT) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id C02C08249980 for ; Sat, 19 Sep 2020 04:20:23 +0000 (UTC) X-FDA: 77278509126.16.mouth62_0303a7d27130 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin16.hostedemail.com (Postfix) with ESMTP id 933A91012089D for ; Sat, 19 Sep 2020 04:20:23 +0000 (UTC) X-HE-Tag: mouth62_0303a7d27130 X-Filterd-Recvd-Size: 3652 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf26.hostedemail.com (Postfix) with ESMTP for ; Sat, 19 Sep 2020 04:20:23 +0000 (UTC) Received: from localhost.localdomain (c-71-198-47-131.hsd1.ca.comcast.net [71.198.47.131]) (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 0BA2220874; Sat, 19 Sep 2020 04:20:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600489222; bh=T16eJfOJMoalDgg9KcTh1y7MMH+8BiJwclfD9iF64J8=; h=Date:From:To:Subject:In-Reply-To:From; b=EggG7EyVJfkMA1ZJBnajXUYRSiukAvNJrve9kosRdMd+ZkF2mkKUWSDMhgNj2VRf1 jedAosI1ey2E1AxpjYh2+p14mj4dFEtXC4dcIl9K34aEStz+AX6+Wm9MuSWxrCtc4Y FQz/GZbGplrzD2MnzP8XzMeTKti0eUqv49zlXEZ0= Date: Fri, 18 Sep 2020 21:20:21 -0700 From: Andrew Morton To: akpm@linux-foundation.org, anil.s.keshavamurthy@intel.com, davem@davemloft.net, linux-mm@kvack.org, mhiramat@kernel.org, mm-commits@vger.kernel.org, naveen.n.rao@linux.ibm.com, rostedt@goodmis.org, songliubraving@fb.com, songmuchun@bytedance.com, stable@vger.kernel.org, torvalds@linux-foundation.org, zhouchengming@bytedance.com Subject: [patch 08/15] kprobes: fix kill kprobe which has been marked as gone Message-ID: <20200919042021.X10NZatlE%akpm@linux-foundation.org> In-Reply-To: <20200918211925.7e97f0ef63d92f5cfe5ccbc5@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Muchun Song Subject: kprobes: fix kill kprobe which has been marked as gone If a kprobe is marked as gone, we should not kill it again. Otherwise, we can disarm the kprobe more than once. In that case, the statistics of kprobe_ftrace_enabled can unbalance which can lead to that kprobe do not work. Link: https://lkml.kernel.org/r/20200822030055.32383-1-songmuchun@bytedance.com Fixes: e8386a0cb22f ("kprobes: support probing module __exit function") Signed-off-by: Muchun Song Co-developed-by: Chengming Zhou Signed-off-by: Chengming Zhou Acked-by: Masami Hiramatsu Cc: "Naveen N . Rao" Cc: Anil S Keshavamurthy Cc: David S. Miller Cc: Song Liu Cc: Steven Rostedt Cc: Signed-off-by: Andrew Morton --- kernel/kprobes.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/kernel/kprobes.c~kprobes-fix-kill-kprobe-which-has-been-marked-as-gone +++ a/kernel/kprobes.c @@ -2140,6 +2140,9 @@ static void kill_kprobe(struct kprobe *p lockdep_assert_held(&kprobe_mutex); + if (WARN_ON_ONCE(kprobe_gone(p))) + return; + p->flags |= KPROBE_FLAG_GONE; if (kprobe_aggrprobe(p)) { /* @@ -2419,7 +2422,10 @@ static int kprobes_module_callback(struc mutex_lock(&kprobe_mutex); for (i = 0; i < KPROBE_TABLE_SIZE; i++) { head = &kprobe_table[i]; - hlist_for_each_entry(p, head, hlist) + hlist_for_each_entry(p, head, hlist) { + if (kprobe_gone(p)) + continue; + if (within_module_init((unsigned long)p->addr, mod) || (checkcore && within_module_core((unsigned long)p->addr, mod))) { @@ -2436,6 +2442,7 @@ static int kprobes_module_callback(struc */ kill_kprobe(p); } + } } if (val == MODULE_STATE_GOING) remove_module_kprobe_blacklist(mod); _