From patchwork Mon May 17 13:59:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 440785 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 101AEC43460 for ; Mon, 17 May 2021 15:04:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EA224610E9 for ; Mon, 17 May 2021 15:04:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239830AbhEQPGM (ORCPT ); Mon, 17 May 2021 11:06:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:34942 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242634AbhEQPEL (ORCPT ); Mon, 17 May 2021 11:04:11 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DD7A861A25; Mon, 17 May 2021 14:28:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621261695; bh=YETmwC0vmkJEnYjZRQtB8GtVeKH+RSjRHV996b86cVk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TAIKzFoNFOvybyZ8ssZVoMkIoi3dEvDaXHrSi2SXqmm6RQ3V5F7yOV7zGt1GCVZyx m/fHDIzxh/UKT17HLgrr1SrEMIszvnkwkgfLi4/ICVG3tS2n+IvLnG0/LOH36ABck1 raEUSWcQ62yz4/m7+jnkNWabIbGdHAwsLnHhW704= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Miklos Szeredi , Sasha Levin Subject: [PATCH 5.10 053/289] cuse: prevent clone Date: Mon, 17 May 2021 15:59:38 +0200 Message-Id: <20210517140306.987100175@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140305.140529752@linuxfoundation.org> References: <20210517140305.140529752@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 45082269e698..a37528b51798 100644 --- a/fs/fuse/cuse.c +++ b/fs/fuse/cuse.c @@ -627,6 +627,8 @@ 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))