diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/xen/evtchn.c | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c index f4edd6df3df2..7efd1cb9bb40 100644 --- a/drivers/xen/evtchn.c +++ b/drivers/xen/evtchn.c @@ -73,8 +73,12 @@ struct per_user_data { 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 @@ static long evtchn_ioctl(struct file *file, 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 @@ static long evtchn_ioctl(struct file *file, 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 @@ static long evtchn_ioctl(struct file *file, 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 @@ static long evtchn_ioctl(struct file *file, 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 @@ static int evtchn_open(struct inode *inode, struct file *filp) 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); |