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=1576172444; cv=none; d=zohomail.com; s=zohoarc; b=TZkYBPeC9okgLRLGli+owWQZSPhm91UFCdrV1Pa1C+YaKnEfX+I7upqY8y2b0dQen3FlehJVPCRYN0PY96cHH9Grlbv2YEttA9s/wFwxolwIlY+UmLhB7BlUXU++6ZW2FhKxvRz4kNNOpF0vfe+b7O8CrEAqIFSBfrKPqP0vQcM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1576172444; 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=X6205B7Ic1h/LCC3M1Bz1czJphWfOokfK6qODd4QtJo=; b=eIE0D5T+44Bp1klCkIlpeja6lEBb88nxphmHCbKobIZtdeYJ2uLZXodxi6pdHTcrRNy1xA3qlI7i/dw7pv39sQhI4AKYp4ub/pPyc11ZmOeEC5pv8Ie9OZn8wrKiAV44/nJ0c21GC45/WeNrCKZ88G4U7PAHCHvSlUuEhR8GxbI= 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 1576172444823792.893870090123; Thu, 12 Dec 2019 09:40:44 -0800 (PST) Received: from localhost ([::1]:34828 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifSSB-0002C6-ES for importer@patchew.org; Thu, 12 Dec 2019 12:40:43 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:57535) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRWL-0006rY-UY for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:58 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ifRWK-0003Vz-NS for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:57 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:47584 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ifRWK-0003V7-IZ for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:40:56 -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-113-lfUnXGkyPkyoUvmFduIngg-1; Thu, 12 Dec 2019 11:40:54 -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 99E6D189CD02 for ; Thu, 12 Dec 2019 16:40:53 +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 9083960BE1; Thu, 12 Dec 2019 16:40:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576168856; 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=X6205B7Ic1h/LCC3M1Bz1czJphWfOokfK6qODd4QtJo=; b=Bl0CyXtsVloKAu9rXwJSSXsrKjsJFuL84atgUU9HK3QoATrT58CfwQ3+5EfPj3IpZy4pix 1mN2qbf7aTCyB9ozSVA5kBMdYFJjvJzEC6wXfClK2YMzGwssDfu1xLV+xD+fCDfCDz0iVM nGGm2vX3T1hGvsVuuqlb7LRCHxoQh0g= From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 070/104] virtiofsd: fail when parent inode isn't known in lo_do_lookup() Date: Thu, 12 Dec 2019 16:38:30 +0000 Message-Id: <20191212163904.159893-71-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: lfUnXGkyPkyoUvmFduIngg-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: 207.211.31.81 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: Miklos Szeredi The Linux file handle APIs (struct export_operations) can access inodes that are not attached to parents because path name traversal is not performed. Refuse if there is no parent in lo_do_lookup(). Also clean up lo_do_lookup() while we're here. Signed-off-by: Miklos Szeredi Signed-off-by: Stefan Hajnoczi --- tools/virtiofsd/passthrough_ll.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough= _ll.c index 1618db5a92..ef8b88e3d1 100644 --- a/tools/virtiofsd/passthrough_ll.c +++ b/tools/virtiofsd/passthrough_ll.c @@ -778,6 +778,15 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t par= ent, const char *name, struct lo_data *lo =3D lo_data(req); struct lo_inode *inode, *dir =3D lo_inode(req, parent); =20 + /* + * name_to_handle_at() and open_by_handle_at() can reach here with fuse + * mount point in guest, but we don't have its inode info in the + * ino_map. + */ + if (!dir) { + return ENOENT; + } + memset(e, 0, sizeof(*e)); e->attr_timeout =3D lo->timeout; e->entry_timeout =3D lo->timeout; @@ -787,7 +796,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t pare= nt, const char *name, name =3D "."; } =20 - newfd =3D openat(lo_fd(req, parent), name, O_PATH | O_NOFOLLOW); + newfd =3D openat(dir->fd, name, O_PATH | O_NOFOLLOW); if (newfd =3D=3D -1) { goto out_err; } @@ -797,7 +806,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t pare= nt, const char *name, goto out_err; } =20 - inode =3D lo_find(lo_data(req), &e->attr); + inode =3D lo_find(lo, &e->attr); if (inode) { close(newfd); newfd =3D -1; @@ -813,6 +822,7 @@ static int lo_do_lookup(fuse_req_t req, fuse_ino_t pare= nt, const char *name, inode->is_symlink =3D S_ISLNK(e->attr.st_mode); inode->refcount =3D 1; inode->fd =3D newfd; + newfd =3D -1; inode->ino =3D e->attr.st_ino; inode->dev =3D e->attr.st_dev; =20 --=20 2.23.0