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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>
This commit is contained in:
Prasad J Pandit 2019-02-18 23:43:49 +05:30 committed by David Gibson
parent 6eebe6dccb
commit 27461d69a0
2 changed files with 72 additions and 6 deletions
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64
hw/ppc/spapr.c
View File

@ -1247,14 +1247,31 @@ 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 (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 (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);
@ -3144,6 +3161,36 @@ static void spapr_set_ic_mode(Object *obj, const char *value, Error **errp)
}
}
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_instance_init(Object *obj)
{
sPAPRMachineState *spapr = SPAPR_MACHINE(obj);
@ -3189,6 +3236,17 @@ static void spapr_instance_init(Object *obj)
object_property_set_description(obj, "ic-mode",
"Specifies the interrupt controller mode (xics, xive, dual)",
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)
@ -4086,9 +4144,15 @@ DEFINE_SPAPR_MACHINE(4_0, "4.0", true);
static void spapr_machine_3_1_class_options(MachineClass *mc)
{
sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(mc);
static GlobalProperty compat[] = {
{ TYPE_SPAPR_MACHINE, "host-model", "passthrough" },
{ TYPE_SPAPR_MACHINE, "host-serial", "passthrough" },
};
spapr_machine_4_0_class_options(mc);
compat_props_add(mc->compat_props, hw_compat_3_1, hw_compat_3_1_len);
compat_props_add(mc->compat_props, compat, G_N_ELEMENTS(compat));
mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("power8_v2.0");
smc->update_dt_enabled = false;
}

2
include/hw/ppc/spapr.h
View File

@ -177,6 +177,8 @@ struct sPAPRMachineState {
/*< public >*/
char *kvm_type;
char *host_model;
char *host_serial;
int32_t irq_map_nr;
unsigned long *irq_map;