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=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 5A51FC433E0 for ; Mon, 8 Feb 2021 15:52:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4FF364E6E for ; Mon, 8 Feb 2021 15:51:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234119AbhBHPvp (ORCPT ); Mon, 8 Feb 2021 10:51:45 -0500 Received: from mail.kernel.org ([198.145.29.99]:52060 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230231AbhBHPHP (ORCPT ); Mon, 8 Feb 2021 10:07:15 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id DD72264EC3; Mon, 8 Feb 2021 15:05:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612796743; bh=XNB5Kb6a/T3bRSttZEMsuYhm1giFt/X4+p086CTSXrY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nNOr3o9UP05S8ifZZ7nEee7x/kmAD1bbC3tmI9NFncHnDyvUQF2ub0F0pjpcmy2ob 9pnFXJwyWsAoZ+ZM7ul7BPkunbXLpzqNzCz41rZdyhniu2VBKPKS8KuQvqIWZFLgsy CFk+ma5xp1aJBlmD+TePdvK4fQnT16j0SfGL/QCE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Naveen N. Rao" , Ananth N Mavinakayanahalli , Masami Hiramatsu , Wang ShaoBo , Cheng Jian , "Steven Rostedt (VMware)" Subject: [PATCH 4.9 29/43] kretprobe: Avoid re-registration of the same kretprobe earlier Date: Mon, 8 Feb 2021 16:00:55 +0100 Message-Id: <20210208145807.486860064@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210208145806.281758651@linuxfoundation.org> References: <20210208145806.281758651@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wang ShaoBo commit 0188b87899ffc4a1d36a0badbe77d56c92fd91dc upstream. Our system encountered a re-init error when re-registering same kretprobe, where the kretprobe_instance in rp->free_instances is illegally accessed after re-init. Implementation to avoid re-registration has been introduced for kprobe before, but lags for register_kretprobe(). We must check if kprobe has been re-registered before re-initializing kretprobe, otherwise it will destroy the data struct of kretprobe registered, which can lead to memory leak, system crash, also some unexpected behaviors. We use check_kprobe_rereg() to check if kprobe has been re-registered before running register_kretprobe()'s body, for giving a warning message and terminate registration process. Link: https://lkml.kernel.org/r/20210128124427.2031088-1-bobo.shaobowang@huawei.com Cc: stable@vger.kernel.org Fixes: 1f0ab40976460 ("kprobes: Prevent re-registration of the same kprobe") [ The above commit should have been done for kretprobes too ] Acked-by: Naveen N. Rao Acked-by: Ananth N Mavinakayanahalli Acked-by: Masami Hiramatsu Signed-off-by: Wang ShaoBo Signed-off-by: Cheng Jian Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Greg Kroah-Hartman --- kernel/kprobes.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1884,6 +1884,10 @@ int register_kretprobe(struct kretprobe int i; void *addr; + /* If only rp->kp.addr is specified, check reregistering kprobes */ + if (rp->kp.addr && check_kprobe_rereg(&rp->kp)) + return -EINVAL; + if (kretprobe_blacklist_size) { addr = kprobe_addr(&rp->kp); if (IS_ERR(addr))