From nobody Mon Feb 9 08:59:32 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1576170566; cv=none; d=zohomail.com; s=zohoarc; b=HvUTS7c935FS9M3PD9HecAo98r71E97gW0lzMXK8J36u71b1EH7omo73BznKW/qy+liM47dsh0nK9cbU9hTHFDOwr49aCAK9iFHzR4n3+ovQA8fKGthExivTEDZrgFWfb1z6h2QjcvwbgLWexPId1HDJq0c2R/CMCHo3LlaKWkI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1576170566; h=Content-Type:Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=2pPkcTDbg2Ft/Kd4Nxw37J0s4UnWXFLsrevFA2xZOfQ=; b=ORCMwaHnntuNcd64yZtVapXZf7tMtwZVA19ZGVcGv3XYKCFF3fm9zio4zZaMD8ib4STUv1xG2hQMfVDaf+kE1ZXgVhNXrlDEgaqyY+ELGR32ukuy6e9TjEJCV6CSWjI5WwWE6HU7BIIxtfSTl/fay+o2UlCVWLqGuOS+Y6PB0g0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1576170566563752.2846938356048; Thu, 12 Dec 2019 09:09:26 -0800 (PST) Received: from localhost ([::1]:34440 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRxt-0004gI-2k for importer@patchew.org; Thu, 12 Dec 2019 12:09:25 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51240) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRVn-0005yO-Qs for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:25 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ifRVl-0002Pt-UU for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:23 -0500 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:28783 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ifRVl-0002P3-Ny for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:21 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-226-2Lt50MTqPN6cOSZZ-gbE7Q-1; Thu, 12 Dec 2019 11:40:19 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4F574107ACC4 for ; Thu, 12 Dec 2019 16:40:18 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-116-226.ams2.redhat.com [10.36.116.226]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B0E660BE1; Thu, 12 Dec 2019 16:40:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576168821; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2pPkcTDbg2Ft/Kd4Nxw37J0s4UnWXFLsrevFA2xZOfQ=; b=FJMWhpbiwDAUPzZ7wJNOKNzyUYmbSa4WFEN0wSB5l6SCT7rYr1VmfRWtAv7K17RvHVGHrL tvnwGHJ1golo9dkkeI8qtRAKR7FCtPiAgmt98XYteu5JNV66P806b09dAc6Yo99mT8AphR sA2t7KoTBPeeDnjpaerfWTyko/nW5b4= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 044/104] virtiofsd: prevent ".." escape in lo_do_lookup() Date: Thu, 12 Dec 2019 16:38:04 +0000 Message-Id: <20191212163904.159893-45-dgilbert@redhat.com> In-Reply-To: <20191212163904.159893-1-dgilbert@redhat.com> References: <20191212163904.159893-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: 2Lt50MTqPN6cOSZZ-gbE7Q-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi Signed-off-by: Stefan Hajnoczi --- tools/virtiofsd/passthrough_ll.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index 84e9d8916f..cf5b43531a 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -624,12 +624,17 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t pa= rent, const char *name, int res; int saverr; struct lo_data *lo =3D lo_data(req); - struct lo_inode *inode; + struct lo_inode *inode, *dir =3D lo_inode(req, parent); =20 memset(e, 0, sizeof(*e)); e->attr_timeout =3D lo->timeout; e->entry_timeout =3D lo->timeout; =20 + /* Do not allow escaping root directory */ + if (dir =3D=3D &lo->root && strcmp(name, "..") =3D=3D 0) { + name =3D "."; + } + newfd =3D openat(lo_fd(req, parent), name, O_PATH | O_NOFOLLOW); if (newfd =3D=3D -1) { goto out_err; --=20 2.23.0