From patchwork Tue Mar 28 15:54:55 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Durrant X-Patchwork-Id: 9650079 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CD4EE602C8 for ; Tue, 28 Mar 2017 15:57:36 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BEA6324151 for ; Tue, 28 Mar 2017 15:57:36 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B352328414; Tue, 28 Mar 2017 15:57:36 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 08EE424151 for ; Tue, 28 Mar 2017 15:57:36 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cstSY-0007UR-2k; Tue, 28 Mar 2017 15:55:02 +0000 Received: from mail6.bemta3.messagelabs.com ([195.245.230.39]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cstSW-0007Sr-Sc for xen-devel@lists.xenproject.org; Tue, 28 Mar 2017 15:55:00 +0000 Received: from [85.158.137.68] by server-17.bemta-3.messagelabs.com id FF/78-04270-4578AD85; Tue, 28 Mar 2017 15:55:00 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrFLMWRWlGSWpSXmKPExsXitHRDpG5w+60 Ig6OXNSy+b5nM5MDocfjDFZYAxijWzLyk/IoE1ozWR08ZCxYYVyxofcrYwPhFs4uRk0NCwF/i 4/8L7CA2m4COxNSnl1hBbBEBW4n+79+BbC4OZoEWRokTH6YzgiSEBbwk/m9fwgZiswioSjy6M g+smVfATWLJupnsEEPlJM4f/8kMYgsJqEisnzqLDaJGUOLkzCcsIDazgITEwRcvmCcwcs9Ckp qFJLWAkWkVo0ZxalFZapGuobFeUlFmekZJbmJmjq6hgbFebmpxcWJ6ak5iUrFecn7uJkZgODA AwQ7Gbds9DzFKcjApifJ+CLoVIcSXlJ9SmZFYnBFfVJqTWnyIUYaDQ0mCN7ENKCdYlJqeWpGW mQMMTJi0BAePkgjvapA0b3FBYm5xZjpE6hSjLsec2bvfMAmx5OXnpUqJ84aBFAmAFGWU5sGNg EXJJUZZKWFeRqCjhHgKUotyM0tQ5V8xinMwKgnzzgOZwpOZVwK36RXQEUxAR4jbgB1RkoiQkm pgVDuY7Hz5VdK93/76Ve1XXRK5f834Eb5qWji7zFFX3vO3JdUu+bL1X7znJDDz8Nf4cyfauef cVpLn+57B9cCpuPvMg9+KdzpnvFqz31D0hnvUnX+TYpcbCjQ92pconNR2/Oj+EB1dTt3vsdYK l84dC7uddXal8wTJuW12/CY5MQGXb4vV7a+tUGIpzkg01GIuKk4EALBVwHuNAgAA X-Env-Sender: prvs=25381d7d4=Paul.Durrant@citrix.com X-Msg-Ref: server-3.tower-31.messagelabs.com!1490716497!92517541!1 X-Originating-IP: [66.165.176.89] X-SpamReason: No, hits=0.0 required=7.0 tests=sa_preprocessor: VHJ1c3RlZCBJUDogNjYuMTY1LjE3Ni44OSA9PiAyMDMwMDc=\n, received_headers: No Received headers X-StarScan-Received: X-StarScan-Version: 9.2.3; banners=-,-,- X-VirusChecked: Checked Received: (qmail 57155 invoked from network); 28 Mar 2017 15:54:59 -0000 Received: from smtp.citrix.com (HELO SMTP.CITRIX.COM) (66.165.176.89) by server-3.tower-31.messagelabs.com with RC4-SHA encrypted SMTP; 28 Mar 2017 15:54:59 -0000 X-IronPort-AV: E=Sophos;i="5.36,237,1486425600"; d="scan'208";a="416292195" From: Paul Durrant To: , Date: Tue, 28 Mar 2017 16:54:55 +0100 Message-ID: <1490716495-1685-1-git-send-email-paul.durrant@citrix.com> X-Mailer: git-send-email 2.1.4 MIME-Version: 1.0 Cc: Anthony Perard , Paul Durrant , Stefano Stabellini Subject: [Xen-devel] [PATCH v2] xen: additionally restrict xenforeignmemory operations X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Commit f0f272baf3a7 "xen: use libxendevice model to restrict operations" added a command-line option (-xen-domid-restrict) to limit operations using the libxendevicemodel API to a specified domid. The commit also noted that the restriction would be extended to cover operations issued via other xen libraries by subsequent patches. My recent Xen patch [1] added a call to the xenforeignmemory API to allow it to be restricted. This patch now makes use of that new call when the -xen-domid-restrict option is passed. [1] http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=5823d6eb Signed-off-by: Paul Durrant Reviewed-by: Stefano Stabellini --- Cc: Stefano Stabellini Cc: Anthony Perard v2: - Use Stefano's re-arrangement --- include/hw/xen/xen_common.h | 134 ++++++++++++++++++++++++++------------------ 1 file changed, 78 insertions(+), 56 deletions(-) diff --git a/include/hw/xen/xen_common.h b/include/hw/xen/xen_common.h index 4f3bd35..624fb86 100644 --- a/include/hw/xen/xen_common.h +++ b/include/hw/xen/xen_common.h @@ -27,6 +27,58 @@ extern xc_interface *xen_xc; * We don't support Xen prior to 4.2.0. */ +/* Xen 4.2 through 4.6 */ +#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701 + +typedef xc_interface xenforeignmemory_handle; +typedef xc_evtchn xenevtchn_handle; +typedef xc_gnttab xengnttab_handle; + +#define xenevtchn_open(l, f) xc_evtchn_open(l, f); +#define xenevtchn_close(h) xc_evtchn_close(h) +#define xenevtchn_fd(h) xc_evtchn_fd(h) +#define xenevtchn_pending(h) xc_evtchn_pending(h) +#define xenevtchn_notify(h, p) xc_evtchn_notify(h, p) +#define xenevtchn_bind_interdomain(h, d, p) xc_evtchn_bind_interdomain(h, d, p) +#define xenevtchn_unmask(h, p) xc_evtchn_unmask(h, p) +#define xenevtchn_unbind(h, p) xc_evtchn_unbind(h, p) + +#define xengnttab_open(l, f) xc_gnttab_open(l, f) +#define xengnttab_close(h) xc_gnttab_close(h) +#define xengnttab_set_max_grants(h, n) xc_gnttab_set_max_grants(h, n) +#define xengnttab_map_grant_ref(h, d, r, p) xc_gnttab_map_grant_ref(h, d, r, p) +#define xengnttab_unmap(h, a, n) xc_gnttab_munmap(h, a, n) +#define xengnttab_map_grant_refs(h, c, d, r, p) \ + xc_gnttab_map_grant_refs(h, c, d, r, p) +#define xengnttab_map_domain_grant_refs(h, c, d, r, p) \ + xc_gnttab_map_domain_grant_refs(h, c, d, r, p) + +#define xenforeignmemory_open(l, f) xen_xc +#define xenforeignmemory_close(h) + +static inline void *xenforeignmemory_map(xc_interface *h, uint32_t dom, + int prot, size_t pages, + const xen_pfn_t arr[/*pages*/], + int err[/*pages*/]) +{ + if (err) + return xc_map_foreign_bulk(h, dom, prot, arr, err, pages); + else + return xc_map_foreign_pages(h, dom, prot, arr, pages); +} + +#define xenforeignmemory_unmap(h, p, s) munmap(p, s * XC_PAGE_SIZE) + +#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */ + +#include +#include +#include + +#endif + +extern xenforeignmemory_handle *xen_fmem; + #if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40900 typedef xc_interface xendevicemodel_handle; @@ -159,6 +211,13 @@ static inline int xendevicemodel_restrict( return -1; } +static inline int xenforeignmemory_restrict( + xenforeignmemory_handle *fmem, domid_t domid) +{ + errno = ENOTTY; + return -1; +} + #else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40900 */ #include @@ -215,69 +274,32 @@ static inline int xen_modified_memory(domid_t domid, uint64_t first_pfn, static inline int xen_restrict(domid_t domid) { - int rc = xendevicemodel_restrict(xen_dmod, domid); + int rc; - trace_xen_domid_restrict(errno); + /* Attempt to restrict devicemodel operations */ + rc = xendevicemodel_restrict(xen_dmod, domid); + trace_xen_domid_restrict(rc ? errno : 0); - if (errno == ENOTTY) { - return 0; + if (rc < 0) { + /* + * If errno is ENOTTY then restriction is not implemented so + * there's no point in trying to restrict other types of + * operation, but it should not be treated as a failure. + */ + if (errno == ENOTTY) { + return 0; + } + + return rc; } - return rc; -} - -/* Xen 4.2 through 4.6 */ -#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701 - -typedef xc_interface xenforeignmemory_handle; -typedef xc_evtchn xenevtchn_handle; -typedef xc_gnttab xengnttab_handle; - -#define xenevtchn_open(l, f) xc_evtchn_open(l, f); -#define xenevtchn_close(h) xc_evtchn_close(h) -#define xenevtchn_fd(h) xc_evtchn_fd(h) -#define xenevtchn_pending(h) xc_evtchn_pending(h) -#define xenevtchn_notify(h, p) xc_evtchn_notify(h, p) -#define xenevtchn_bind_interdomain(h, d, p) xc_evtchn_bind_interdomain(h, d, p) -#define xenevtchn_unmask(h, p) xc_evtchn_unmask(h, p) -#define xenevtchn_unbind(h, p) xc_evtchn_unbind(h, p) - -#define xengnttab_open(l, f) xc_gnttab_open(l, f) -#define xengnttab_close(h) xc_gnttab_close(h) -#define xengnttab_set_max_grants(h, n) xc_gnttab_set_max_grants(h, n) -#define xengnttab_map_grant_ref(h, d, r, p) xc_gnttab_map_grant_ref(h, d, r, p) -#define xengnttab_unmap(h, a, n) xc_gnttab_munmap(h, a, n) -#define xengnttab_map_grant_refs(h, c, d, r, p) \ - xc_gnttab_map_grant_refs(h, c, d, r, p) -#define xengnttab_map_domain_grant_refs(h, c, d, r, p) \ - xc_gnttab_map_domain_grant_refs(h, c, d, r, p) - -#define xenforeignmemory_open(l, f) xen_xc -#define xenforeignmemory_close(h) + /* Restrict foreignmemory operations */ + rc = xenforeignmemory_restrict(xen_fmem, domid); + trace_xen_domid_restrict(rc ? errno : 0); -static inline void *xenforeignmemory_map(xc_interface *h, uint32_t dom, - int prot, size_t pages, - const xen_pfn_t arr[/*pages*/], - int err[/*pages*/]) -{ - if (err) - return xc_map_foreign_bulk(h, dom, prot, arr, err, pages); - else - return xc_map_foreign_pages(h, dom, prot, arr, pages); + return rc; } -#define xenforeignmemory_unmap(h, p, s) munmap(p, s * XC_PAGE_SIZE) - -#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */ - -#include -#include -#include - -#endif - -extern xenforeignmemory_handle *xen_fmem; - void destroy_hvm_domain(bool reboot); /* shutdown/destroy current domain because of an error */