xen/evtchn: add IOCTL_EVTCHN_RESTRICT
IOCTL_EVTCHN_RESTRICT limits the file descriptor to being able to bind
to interdomain event channels from a specific domain. Event channels
that are already bound continue to work for sending and receiving
notifications.
This is useful as part of deprivileging a user space PV backend or
device model (QEMU). e.g., Once the device model as bound to the
ioreq server event channels it can restrict the file handle so an
exploited DM cannot use it to create or bind to arbitrary event
channels.
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index f4edd6d..7efd1cb 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -73,8 +73,12 @@
wait_queue_head_t evtchn_wait;
struct fasync_struct *evtchn_async_queue;
const char *name;
+
+ domid_t restrict_domid;
};
+#define UNRESTRICTED_DOMID ((domid_t)-1)
+
struct user_evtchn {
struct rb_node node;
struct per_user_data *user;
@@ -443,6 +447,10 @@
struct ioctl_evtchn_bind_virq bind;
struct evtchn_bind_virq bind_virq;
+ rc = -EACCES;
+ if (u->restrict_domid != UNRESTRICTED_DOMID)
+ break;
+
rc = -EFAULT;
if (copy_from_user(&bind, uarg, sizeof(bind)))
break;
@@ -468,6 +476,11 @@
if (copy_from_user(&bind, uarg, sizeof(bind)))
break;
+ rc = -EACCES;
+ if (u->restrict_domid != UNRESTRICTED_DOMID &&
+ u->restrict_domid != bind.remote_domain)
+ break;
+
bind_interdomain.remote_dom = bind.remote_domain;
bind_interdomain.remote_port = bind.remote_port;
rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
@@ -485,6 +498,10 @@
struct ioctl_evtchn_bind_unbound_port bind;
struct evtchn_alloc_unbound alloc_unbound;
+ rc = -EACCES;
+ if (u->restrict_domid != UNRESTRICTED_DOMID)
+ break;
+
rc = -EFAULT;
if (copy_from_user(&bind, uarg, sizeof(bind)))
break;
@@ -553,6 +570,27 @@
break;
}
+ case IOCTL_EVTCHN_RESTRICT_DOMID: {
+ struct ioctl_evtchn_restrict_domid ierd;
+
+ rc = -EACCES;
+ if (u->restrict_domid != UNRESTRICTED_DOMID)
+ break;
+
+ rc = -EFAULT;
+ if (copy_from_user(&ierd, uarg, sizeof(ierd)))
+ break;
+
+ rc = -EINVAL;
+ if (ierd.domid == 0 || ierd.domid >= DOMID_FIRST_RESERVED)
+ break;
+
+ u->restrict_domid = ierd.domid;
+ rc = 0;
+
+ break;
+ }
+
default:
rc = -ENOSYS;
break;
@@ -601,6 +639,8 @@
mutex_init(&u->ring_cons_mutex);
spin_lock_init(&u->ring_prod_lock);
+ u->restrict_domid = UNRESTRICTED_DOMID;
+
filp->private_data = u;
return nonseekable_open(inode, filp);
diff --git a/include/uapi/xen/evtchn.h b/include/uapi/xen/evtchn.h
index 14e833ee4..cb4aa4b 100644
--- a/include/uapi/xen/evtchn.h
+++ b/include/uapi/xen/evtchn.h
@@ -85,4 +85,19 @@
#define IOCTL_EVTCHN_RESET \
_IOC(_IOC_NONE, 'E', 5, 0)
+/*
+ * Restrict this file descriptor so that it can only be used to bind
+ * new interdomain events from one domain.
+ *
+ * Once a file descriptor has been restricted it cannot be
+ * de-restricted, and must be closed and re-opened. Event channels
+ * which were bound before restricting remain bound afterwards, and
+ * can be notified as usual.
+ */
+#define IOCTL_EVTCHN_RESTRICT_DOMID \
+ _IOC(_IOC_NONE, 'E', 6, sizeof(struct ioctl_evtchn_restrict_domid))
+struct ioctl_evtchn_restrict_domid {
+ domid_t domid;
+};
+
#endif /* __LINUX_PUBLIC_EVTCHN_H__ */