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Wed, 29 Jul 2020 22:14:37 +0000 (UTC) Received: from horse.redhat.com (ovpn-116-149.rdu2.redhat.com [10.10.116.149]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3F007712FF; Wed, 29 Jul 2020 22:14:32 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id C2020223D04; Wed, 29 Jul 2020 18:14:31 -0400 (EDT) From: Vivek Goyal To: qemu-devel@nongnu.org Subject: [PATCH 1/5] virtiofsd: Add notion of unprivileged mode Date: Wed, 29 Jul 2020 18:14:06 -0400 Message-Id: <20200729221410.147556-2-vgoyal@redhat.com> In-Reply-To: <20200729221410.147556-1-vgoyal@redhat.com> References: <20200729221410.147556-1-vgoyal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=vgoyal@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/29 09:27:47 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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, dgilbert@redhat.com, virtio-fs@redhat.com, stefanha@redhat.com, vgoyal@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" At startup if we are running as non-root user, then internall set unpriviliged mode set. Also add a notion of sandbox NONE and set that internally in unprivileged mode. setting up namespaces and chroot() fails when one does not have privileges. 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; }