From: Prasad J Pandit <p...@fedoraproject.org> 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 <berra...@redhat.com> Fix-suggested-by: Daniel P. Berrangé <berra...@redhat.com> Signed-off-by: Prasad J Pandit <p...@fedoraproject.org> --- hw/ppc/spapr.c | 79 ++++++++++++++++++++++++++++++++++++++---- include/hw/ppc/spapr.h | 2 ++ 2 files changed, 75 insertions(+), 6 deletions(-) Update v3: move host-serial,host-model options to ppc sPAPR machine -> https://lists.gnu.org/archive/html/qemu-devel/2019-02/msg03182.html diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 0942f35bf8..666e500376 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1249,13 +1249,30 @@ 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); @@ -3138,6 +3155,36 @@ 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); @@ -3183,6 +3230,20 @@ static void spapr_instance_init(Object *obj) object_property_set_description(obj, "ic-mode", "Specifies the interrupt controller mode (xics, xive, dual)", NULL); + + spapr->host_model = 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); + + spapr->host_serial = NULL; + 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) @@ -4080,9 +4141,15 @@ 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; } diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index a947a0a0dc..e004a570d8 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -177,6 +177,8 @@ struct sPAPRMachineState { /*< public >*/ char *kvm_type; + char *host_model; + char *host_serial; const char *icp_type; int32_t irq_map_nr; -- 2.20.1