From patchwork Thu Jul 30 19:47:32 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Goyal X-Patchwork-Id: 11693589 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id BB911138C for ; Thu, 30 Jul 2020 19:48:40 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 92A5E20838 for ; Thu, 30 Jul 2020 19:48:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BAaX17ER" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 92A5E20838 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:40200 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k1EXf-0002xD-Rw for patchwork-qemu-devel@patchwork.kernel.org; Thu, 30 Jul 2020 15:48:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60070) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k1EX4-0001jr-7j for qemu-devel@nongnu.org; Thu, 30 Jul 2020 15:48:02 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:49094 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1k1EX1-0006kd-I9 for qemu-devel@nongnu.org; Thu, 30 Jul 2020 15:48:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1596138478; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=DGBjvtXB4L2SI6nM108SphLzu7g5pVlFobBDWdOoClA=; b=BAaX17ER3gYrqDd6J+bEGugFPC53yS3fXOkajF8nzgMOYGXQuELxiu+9Uh0oXQvPwFoKf+ klQzucio3DomHCb4yzoXoyh/k11MZEPeX0MZH4XGepetYGB/D1jbGWcFkClJMBqEM1f26L NEd5g+VlDbyCmUrT85WdPs/tnlaaCRU= 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-400-QIigYv4FNPejSJWl7Kk6MA-1; Thu, 30 Jul 2020 15:47:56 -0400 X-MC-Unique: QIigYv4FNPejSJWl7Kk6MA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 87445101C8A7 for ; Thu, 30 Jul 2020 19:47:55 +0000 (UTC) Received: from horse.redhat.com (ovpn-117-166.rdu2.redhat.com [10.10.117.166]) by smtp.corp.redhat.com (Postfix) with ESMTP id D56FD1C6; Thu, 30 Jul 2020 19:47:49 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 5B80E223D04; Thu, 30 Jul 2020 15:47:48 -0400 (EDT) From: Vivek Goyal To: qemu-devel@nongnu.org Subject: [PATCH v2 1/5] virtiofsd: Add notion of unprivileged mode Date: Thu, 30 Jul 2020 15:47:32 -0400 Message-Id: <20200730194736.173994-2-vgoyal@redhat.com> In-Reply-To: <20200730194736.173994-1-vgoyal@redhat.com> References: <20200730194736.173994-1-vgoyal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.61; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/30 03:41:52 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: , Cc: berrange@redhat.com, vromanso@redhat.com, dwalsh@redhat.com, dgilbert@redhat.com, virtio-fs@redhat.com, stefanha@redhat.com, vgoyal@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" At startup if we are running as non-root user, then internally set unpriviliged mode set. Also add a notion of sandbox NONE and set that internally in unprivileged mode. setting up namespaces and chroot() fails in unpriviliged mode. Signed-off-by: Vivek Goyal --- tools/virtiofsd/passthrough_ll.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c index e2fbc614fd..cd91c4a831 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -147,11 +147,13 @@ enum { enum { SANDBOX_NAMESPACE, SANDBOX_CHROOT, + SANDBOX_NONE, }; struct lo_data { pthread_mutex_t mutex; int sandbox; + bool unprivileged; int debug; int writeback; int flock; @@ -3288,6 +3290,12 @@ int main(int argc, char *argv[]) lo_map_init(&lo.dirp_map); lo_map_init(&lo.fd_map); + if (geteuid() != 0) { + lo.unprivileged = true; + lo.sandbox = SANDBOX_NONE; + fuse_log(FUSE_LOG_DEBUG, "Running in unprivileged passthrough mode.\n"); + } + if (fuse_parse_cmdline(&args, &opts) != 0) { goto err_out1; }