From patchwork Mon Apr 25 17:22:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Daniel P. Smith" X-Patchwork-Id: 12826007 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5CC3BC433EF for ; Mon, 25 Apr 2022 17:23:24 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.313193.530684 (Exim 4.92) (envelope-from ) id 1nj2Qb-0002kF-Ro; Mon, 25 Apr 2022 17:23:13 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 313193.530684; Mon, 25 Apr 2022 17:23:13 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nj2Qb-0002k8-Om; Mon, 25 Apr 2022 17:23:13 +0000 Received: by outflank-mailman (input) for mailman id 313193; Mon, 25 Apr 2022 17:23:12 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1nj2Qa-0001m7-DI for xen-devel@lists.xenproject.org; Mon, 25 Apr 2022 17:23:12 +0000 Received: from sender4-of-o51.zoho.com (sender4-of-o51.zoho.com [136.143.188.51]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 60fb6af2-c4bc-11ec-8fc2-03012f2f19d4; Mon, 25 Apr 2022 19:23:11 +0200 (CEST) Received: from sisyou.hme. (static-72-81-132-2.bltmmd.fios.verizon.net [72.81.132.2]) by mx.zohomail.com with SMTPS id 1650907363231921.5550060723041; Mon, 25 Apr 2022 10:22:43 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 60fb6af2-c4bc-11ec-8fc2-03012f2f19d4 ARC-Seal: i=1; a=rsa-sha256; t=1650907366; cv=none; d=zohomail.com; s=zohoarc; b=OlazOEOxrzK71WPG5H8FLehZgfFhBMIxHWiE9u9g3o46mKGyUvf1OYZ4C7hs0IEB5S6PpUO3i61WvUTUyvjGo58jKTc3rheE/Y4NdPwswhSg38qjT7CgcdhelzLcF3acqEclZmDCNmNzzHavdEXZwOWFg0g6MPtBcmU3Dsshw7w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1650907366; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=KWwhu/Y5NhROHWkvOXJZlEXNvPhlxjXhIy0qoopiWYs=; b=eP8FPD14esptgZwJ3FYiRoIlHF4131EjKavFEB7uwscWKHEbjsu8SnT+VD+WIR85CpxZpNJjhIrl0hzsflKTDVaxjBHaWNI+p8D6ovt4fOhjzZ2NsbeBPUNV5cDgnbATOpGAKejblVi3Yfl42BEkDAiQZBtXppYnd9jbW3tDFFE= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=apertussolutions.com; spf=pass smtp.mailfrom=dpsmith@apertussolutions.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1650907366; s=zoho; d=apertussolutions.com; i=dpsmith@apertussolutions.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Date:Message-Id:Message-Id:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Reply-To; bh=KWwhu/Y5NhROHWkvOXJZlEXNvPhlxjXhIy0qoopiWYs=; b=TWDLb6r3vZiKb3mne6i3FruqyO2GfsEabmT2Qurqyhs2Nj+Cv78ZWD/wsiTft9v9 sZBuLEcZHPQ08Dib9X//dotRVKKRPhpxwLDUY2KyPunlAxFm2DlVMIA1L8gHqtYgPLx nmzOOcl60cwrnUaxm9GnDIGWkrMn1LAealv+32n4= From: "Daniel P. Smith" To: xen-devel@lists.xenproject.org, "Daniel P. Smith" Cc: scott.davis@starlab.io, jandryuk@gmail.com, Daniel De Graaf , Wei Liu , Anthony PERARD Subject: [PATCH v4 2/2] flask: implement xsm_set_system_active Date: Mon, 25 Apr 2022 13:22:31 -0400 Message-Id: <20220425172231.27401-3-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220425172231.27401-1-dpsmith@apertussolutions.com> References: <20220425172231.27401-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 X-ZohoMailClient: External This commit implements full support for starting the idle domain privileged by introducing a new flask label xenboot_t which the idle domain is labeled with at creation. It then provides the implementation for the XSM hook xsm_set_system_active to relabel the idle domain to the existing xen_t flask label. In the reference flask policy a new macro, xen_build_domain(target), is introduced for creating policies for dom0less/hyperlaunch allowing the hypervisor to create and assign the necessary resources for domain construction. Signed-off-by: Daniel P. Smith Reviewed-by: Jason Andryuk --- tools/flask/policy/modules/xen.if | 6 ++++++ tools/flask/policy/modules/xen.te | 1 + tools/flask/policy/policy/initial_sids | 1 + xen/xsm/flask/hooks.c | 8 +++++++- xen/xsm/flask/policy/initial_sids | 1 + 5 files changed, 16 insertions(+), 1 deletion(-) diff --git a/tools/flask/policy/modules/xen.if b/tools/flask/policy/modules/xen.if index 5e2aa472b6..4ec676fff1 100644 --- a/tools/flask/policy/modules/xen.if +++ b/tools/flask/policy/modules/xen.if @@ -62,6 +62,12 @@ define(`create_domain_common', ` setparam altp2mhvm altp2mhvm_op dm }; ') +# xen_build_domain(target) +# Allow a domain to be created at boot by the hypervisor +define(`xen_build_domain', ` + allow xenboot_t $1_channel:event create; +') + # create_domain(priv, target) # Allow a domain to be created directly define(`create_domain', ` diff --git a/tools/flask/policy/modules/xen.te b/tools/flask/policy/modules/xen.te index 3dbf93d2b8..de98206fdd 100644 --- a/tools/flask/policy/modules/xen.te +++ b/tools/flask/policy/modules/xen.te @@ -24,6 +24,7 @@ attribute mls_priv; ################################################################################ # The hypervisor itself +type xenboot_t, xen_type, mls_priv; type xen_t, xen_type, mls_priv; # Domain 0 diff --git a/tools/flask/policy/policy/initial_sids b/tools/flask/policy/policy/initial_sids index 6b7b7eff21..ec729d3ba3 100644 --- a/tools/flask/policy/policy/initial_sids +++ b/tools/flask/policy/policy/initial_sids @@ -2,6 +2,7 @@ # objects created before the policy is loaded or for objects that do not have a # label defined in some other manner. +sid xenboot gen_context(system_u:system_r:xenboot_t,s0) sid xen gen_context(system_u:system_r:xen_t,s0) sid dom0 gen_context(system_u:system_r:dom0_t,s0) sid domxen gen_context(system_u:system_r:domxen_t,s0) diff --git a/xen/xsm/flask/hooks.c b/xen/xsm/flask/hooks.c index 8a62de2fd6..92eb12ddb1 100644 --- a/xen/xsm/flask/hooks.c +++ b/xen/xsm/flask/hooks.c @@ -168,7 +168,7 @@ static int cf_check flask_domain_alloc_security(struct domain *d) switch ( d->domain_id ) { case DOMID_IDLE: - dsec->sid = SECINITSID_XEN; + dsec->sid = SECINITSID_XENBOOT; break; case DOMID_XEN: dsec->sid = SECINITSID_DOMXEN; @@ -188,8 +188,12 @@ static int cf_check flask_domain_alloc_security(struct domain *d) static int cf_check flask_set_system_active(void) { + struct domain_security_struct *dsec; struct domain *d = current->domain; + dsec = d->ssid; + ASSERT(dsec->sid == SECINITSID_XENBOOT); + if ( d->domain_id != DOMID_IDLE ) { printk("xsm_set_system_active should only be called by idle domain\n"); @@ -203,6 +207,8 @@ static int cf_check flask_set_system_active(void) */ d->is_privileged = false; + dsec->self_sid = dsec->sid = SECINITSID_XEN; + return 0; } diff --git a/xen/xsm/flask/policy/initial_sids b/xen/xsm/flask/policy/initial_sids index 7eca70d339..e8b55b8368 100644 --- a/xen/xsm/flask/policy/initial_sids +++ b/xen/xsm/flask/policy/initial_sids @@ -3,6 +3,7 @@ # # Define initial security identifiers # +sid xenboot sid xen sid dom0 sid domio