From 27ead906ee01d9c502da1b305da95b4c8ecebc92 Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Mon, 18 Feb 2019 23:43:49 +0530
Subject: [PATCH] ppc: add host-serial and host-model machine attributes
 (CVE-2019-8934)
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On ppc hosts, hypervisor shares following system attributes

  - /proc/device-tree/system-id
  - /proc/device-tree/model

with a guest. This could lead to information leakage and misuse.[*]
Add machine attributes to control such system information exposure
to a guest.

[*] https://wiki.openstack.org/wiki/OSSN/OSSN-0028

Reported-by: Daniel P. Berrangé <berrange@redhat.com>
Fix-suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Message-Id: <20190218181349.23885-1-ppandit@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
(cherry picked from commit 27461d69a0f108dea756419251acc3ea65198f1b)
[LM: BSC#1126455 CVE-2019-03812]
Signed-off-by: Lin Ma <lma@suse.com>
---
 hw/ppc/spapr.c         | 75 ++++++++++++++++++++++++++++++++++++++----
 include/hw/ppc/spapr.h |  2 ++
 2 files changed, 71 insertions(+), 6 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index bda3854e2b..f6fb9bab3a 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -946,13 +946,30 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
      * Add info to guest to indentify which host is it being run on
      * and what is the uuid of the guest
      */
-    if (kvmppc_get_host_model(&buf)) {
-        _FDT(fdt_setprop_string(fdt, 0, "host-model", buf));
-        g_free(buf);
+    if (spapr->host_model && !g_str_equal(spapr->host_model, "none")) {
+        if (g_str_equal(spapr->host_model, "passthrough")) {
+            /* -M host-model=passthrough */
+            if (kvmppc_get_host_model(&buf)) {
+                _FDT(fdt_setprop_string(fdt, 0, "host-model", buf));
+                g_free(buf);
+            }
+        } else {
+            /* -M host-model=<user-string> */
+            _FDT(fdt_setprop_string(fdt, 0, "host-model", spapr->host_model));
+        }
     }
-    if (kvmppc_get_host_serial(&buf)) {
-        _FDT(fdt_setprop_string(fdt, 0, "host-serial", buf));
-        g_free(buf);
+
+    if (spapr->host_serial && !g_str_equal(spapr->host_serial, "none")) {
+        if (g_str_equal(spapr->host_serial, "passthrough")) {
+            /* -M host-serial=passthrough */
+            if (kvmppc_get_host_serial(&buf)) {
+                _FDT(fdt_setprop_string(fdt, 0, "host-serial", buf));
+                g_free(buf);
+            }
+        } else {
+            /* -M host-serial=<user-string> */
+            _FDT(fdt_setprop_string(fdt, 0, "host-serial", spapr->host_serial));
+        }
     }
 
     buf = qemu_uuid_unparse_strdup(&qemu_uuid);
@@ -2406,6 +2423,36 @@ static void spapr_set_modern_hotplug_events(Object *obj, bool value,
     spapr->use_hotplug_event_source = value;
 }
 
+static char *spapr_get_host_model(Object *obj, Error **errp)
+{
+    sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
+
+    return g_strdup(spapr->host_model);
+}
+
+static void spapr_set_host_model(Object *obj, const char *value, Error **errp)
+{
+    sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
+
+    g_free(spapr->host_model);
+    spapr->host_model = g_strdup(value);
+}
+
+static char *spapr_get_host_serial(Object *obj, Error **errp)
+{
+    sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
+
+    return g_strdup(spapr->host_serial);
+}
+
+static void spapr_set_host_serial(Object *obj, const char *value, Error **errp)
+{
+    sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
+
+    g_free(spapr->host_serial);
+    spapr->host_serial = g_strdup(value);
+}
+
 static void spapr_machine_initfn(Object *obj)
 {
     sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
@@ -2426,6 +2473,17 @@ static void spapr_machine_initfn(Object *obj)
                                     " place of standard EPOW events when possible"
                                     " (required for memory hot-unplug support)",
                                     NULL);
+
+    object_property_add_str(obj, "host-model",
+        spapr_get_host_model, spapr_set_host_model,
+        &error_abort);
+    object_property_set_description(obj, "host-model",
+        "Set host's model-id to use - none|passthrough|string", &error_abort);
+    object_property_add_str(obj, "host-serial",
+        spapr_get_host_serial, spapr_set_host_serial,
+        &error_abort);
+    object_property_set_description(obj, "host-serial",
+        "Set host's system-id to use - none|passthrough|string", &error_abort);
 }
 
 static void spapr_machine_finalizefn(Object *obj)
@@ -3203,7 +3261,12 @@ static void spapr_machine_2_8_instance_options(MachineState *machine)
 
 static void spapr_machine_2_8_class_options(MachineClass *mc)
 {
+    static GlobalProperty compat[] = {
+        { TYPE_SPAPR_MACHINE, "host-model", "passthrough" },
+        { TYPE_SPAPR_MACHINE, "host-serial", "passthrough" },
+    };
     spapr_machine_2_9_class_options(mc);
+    compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));
     SET_MACHINE_COMPAT(mc, SPAPR_COMPAT_2_8);
     mc->numa_mem_align_shift = 23;
 }
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 808aac8703..cce72143ec 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -95,6 +95,8 @@ struct sPAPRMachineState {
     char *kvm_type;
     MemoryHotplugState hotplug_memory;
 
+    char *host_model;
+    char *host_serial;
     uint32_t nr_servers;
     ICPState *icps;
 };
