Commit 64190bde authored by Thomas Hellstrom's avatar Thomas Hellstrom

drm/vmwgfx: Reinstate and tighten security around legacy master model

The following restrictions affect clients connecting using legacy nodes:

*) Masters that have dropped master privilieges are not considered
   authenticated until they regain master privileges.
*) Clients whose master have dropped master privileges block interruptibly on
   ioctls  requiring authentication until their master regains master
   privileges. If their master exits, they are killed.

This is primarily designed to prevent clients authenticated with one master to
access data from clients authenticated with another master.
(Think fast user-switching or data sniffers enabled while X is vt-switched).
Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: default avatarBrian Paul <brianp@vmware.com>
parent 294adf7d
...@@ -982,12 +982,70 @@ static int vmw_driver_open(struct drm_device *dev, struct drm_file *file_priv) ...@@ -982,12 +982,70 @@ static int vmw_driver_open(struct drm_device *dev, struct drm_file *file_priv)
return ret; return ret;
} }
static long vmw_unlocked_ioctl(struct file *filp, unsigned int cmd, static struct vmw_master *vmw_master_check(struct drm_device *dev,
unsigned long arg) struct drm_file *file_priv,
unsigned int flags)
{
int ret;
struct vmw_fpriv *vmw_fp = vmw_fpriv(file_priv);
struct vmw_master *vmaster;
if (file_priv->minor->type != DRM_MINOR_LEGACY ||
!(flags & DRM_AUTH))
return NULL;
ret = mutex_lock_interruptible(&dev->master_mutex);
if (unlikely(ret != 0))
return ERR_PTR(-ERESTARTSYS);
if (file_priv->is_master) {
mutex_unlock(&dev->master_mutex);
return NULL;
}
/*
* Check if we were previously master, but now dropped.
*/
if (vmw_fp->locked_master) {
mutex_unlock(&dev->master_mutex);
DRM_ERROR("Dropped master trying to access ioctl that "
"requires authentication.\n");
return ERR_PTR(-EACCES);
}
mutex_unlock(&dev->master_mutex);
/*
* Taking the drm_global_mutex after the TTM lock might deadlock
*/
if (!(flags & DRM_UNLOCKED)) {
DRM_ERROR("Refusing locked ioctl access.\n");
return ERR_PTR(-EDEADLK);
}
/*
* Take the TTM lock. Possibly sleep waiting for the authenticating
* master to become master again, or for a SIGTERM if the
* authenticating master exits.
*/
vmaster = vmw_master(file_priv->master);
ret = ttm_read_lock(&vmaster->lock, true);
if (unlikely(ret != 0))
vmaster = ERR_PTR(ret);
return vmaster;
}
static long vmw_generic_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg,
long (*ioctl_func)(struct file *, unsigned int,
unsigned long))
{ {
struct drm_file *file_priv = filp->private_data; struct drm_file *file_priv = filp->private_data;
struct drm_device *dev = file_priv->minor->dev; struct drm_device *dev = file_priv->minor->dev;
unsigned int nr = DRM_IOCTL_NR(cmd); unsigned int nr = DRM_IOCTL_NR(cmd);
struct vmw_master *vmaster;
unsigned int flags;
long ret;
/* /*
* Do extra checking on driver private ioctls. * Do extra checking on driver private ioctls.
...@@ -1003,11 +1061,37 @@ static long vmw_unlocked_ioctl(struct file *filp, unsigned int cmd, ...@@ -1003,11 +1061,37 @@ static long vmw_unlocked_ioctl(struct file *filp, unsigned int cmd,
nr - DRM_COMMAND_BASE); nr - DRM_COMMAND_BASE);
return -EINVAL; return -EINVAL;
} }
flags = ioctl->flags;
} else if (!drm_ioctl_flags(nr, &flags))
return -EINVAL;
vmaster = vmw_master_check(dev, file_priv, flags);
if (unlikely(IS_ERR(vmaster))) {
DRM_INFO("IOCTL ERROR %d\n", nr);
return PTR_ERR(vmaster);
} }
return drm_ioctl(filp, cmd, arg); ret = ioctl_func(filp, cmd, arg);
if (vmaster)
ttm_read_unlock(&vmaster->lock);
return ret;
} }
static long vmw_unlocked_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
return vmw_generic_ioctl(filp, cmd, arg, &drm_ioctl);
}
#ifdef CONFIG_COMPAT
static long vmw_compat_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
return vmw_generic_ioctl(filp, cmd, arg, &drm_compat_ioctl);
}
#endif
static void vmw_lastclose(struct drm_device *dev) static void vmw_lastclose(struct drm_device *dev)
{ {
struct drm_crtc *crtc; struct drm_crtc *crtc;
...@@ -1315,7 +1399,7 @@ static const struct file_operations vmwgfx_driver_fops = { ...@@ -1315,7 +1399,7 @@ static const struct file_operations vmwgfx_driver_fops = {
.poll = vmw_fops_poll, .poll = vmw_fops_poll,
.read = vmw_fops_read, .read = vmw_fops_read,
#if defined(CONFIG_COMPAT) #if defined(CONFIG_COMPAT)
.compat_ioctl = drm_compat_ioctl, .compat_ioctl = vmw_compat_ioctl,
#endif #endif
.llseek = noop_llseek, .llseek = noop_llseek,
}; };
......
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