From patchwork Thu May 20 09:23:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445267 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=-19.1 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, 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 4405FC43461 for ; Thu, 20 May 2021 11:21:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1F25B6135A for ; Thu, 20 May 2021 11:21:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241183AbhETLWa (ORCPT ); Thu, 20 May 2021 07:22:30 -0400 Received: from mail.kernel.org ([198.145.29.99]:43412 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239705AbhETLUZ (ORCPT ); Thu, 20 May 2021 07:20:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0BB1E6142D; Thu, 20 May 2021 10:11:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621505463; bh=T3kO8RrvNCX8As7P6Z7PFwvA19Yoow54UYuEWBXkQOg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=STXTmyX2mJp309H7cWYCw2MXtA77wVbQl2mFO5sOxAKZ823W44UPOQL8+g0DszGMw jRnzAiAvDuJcAXOv3DqhzGlEDeOejE1xhk6Bihe+ueH0C/EkFoA9BbuCaAX9E8ShpF ddBWRtnqgash6uNxJ0sIxucMku9ZfCOwA8HWkd+8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miklos Szeredi , Sasha Levin Subject: [PATCH 4.4 145/190] cuse: prevent clone Date: Thu, 20 May 2021 11:23:29 +0200 Message-Id: <20210520092106.980683842@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092102.149300807@linuxfoundation.org> References: <20210520092102.149300807@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Miklos Szeredi [ Upstream commit 8217673d07256b22881127bf50dce874d0e51653 ] For cloned connections cuse_channel_release() will be called more than once, resulting in use after free. Prevent device cloning for CUSE, which does not make sense at this point, and highly unlikely to be used in real life. Signed-off-by: Miklos Szeredi Signed-off-by: Sasha Levin --- fs/fuse/cuse.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c index d9aba9700726..b83367300f48 100644 --- a/fs/fuse/cuse.c +++ b/fs/fuse/cuse.c @@ -616,6 +616,8 @@ static int __init cuse_init(void) cuse_channel_fops.owner = THIS_MODULE; cuse_channel_fops.open = cuse_channel_open; cuse_channel_fops.release = cuse_channel_release; + /* CUSE is not prepared for FUSE_DEV_IOC_CLONE */ + cuse_channel_fops.unlocked_ioctl = NULL; cuse_class = class_create(THIS_MODULE, "cuse"); if (IS_ERR(cuse_class))