diff mbox

[5/6] drm: Check mode object lease status in all master ioctl paths [v2]

Message ID 20171005061310.29919-6-keithp@keithp.com
State New, archived
Headers show

Commit Message

Keith Packard Oct. 5, 2017, 6:13 a.m. UTC
Attempts to modify un-leased objects are rejected with an error.
Information returned about unleased objects is modified to make them
appear unusable and/or disconnected.

Changes for v2 as suggested by Daniel Vetter <daniel.vetter@ffwll.ch>:

With the change in the __drm_mode_object_find API to pass the
file_priv along, we can now centralize most of the lease-based access
checks in that function.

A few places skip that API and require in-line checks.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 drivers/gpu/drm/drm_auth.c        |  2 +-
 drivers/gpu/drm/drm_connector.c   |  5 +++--
 drivers/gpu/drm/drm_encoder.c     |  8 +++++---
 drivers/gpu/drm/drm_mode_config.c | 32 +++++++++++++++++++-------------
 drivers/gpu/drm/drm_mode_object.c | 22 ++++++++++++++++++++++
 drivers/gpu/drm/drm_plane.c       |  8 +++++---
 drivers/gpu/drm/drm_vblank.c      | 18 ++++++++++++++++--
 7 files changed, 71 insertions(+), 24 deletions(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
index 541177c71d51..bab26b477738 100644
--- a/drivers/gpu/drm/drm_auth.c
+++ b/drivers/gpu/drm/drm_auth.c
@@ -310,7 +310,7 @@  void drm_master_release(struct drm_file *file_priv)
  */
 bool drm_is_current_master(struct drm_file *fpriv)
 {
-	return fpriv->is_master && fpriv->master == fpriv->minor->dev->master;
+	return fpriv->is_master && drm_lease_owner(fpriv->master) == fpriv->minor->dev->master;
 }
 EXPORT_SYMBOL(drm_is_current_master);
 
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index f8feb2bf142a..65ecdd954a69 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1294,7 +1294,8 @@  int drm_mode_getconnector(struct drm_device *dev, void *data,
 		return -ENOENT;
 
 	for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
-		if (connector->encoder_ids[i] != 0)
+		if (connector->encoder_ids[i] != 0 &&
+		    drm_lease_held(file_priv, connector->encoder_ids[i]))
 			encoders_count++;
 
 	if ((out_resp->count_encoders >= encoders_count) && encoders_count) {
@@ -1361,7 +1362,7 @@  int drm_mode_getconnector(struct drm_device *dev, void *data,
 
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 	encoder = drm_connector_get_encoder(connector);
-	if (encoder)
+	if (encoder && drm_lease_held(file_priv, encoder->base.id))
 		out_resp->encoder_id = encoder->base.id;
 	else
 		out_resp->encoder_id = 0;
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index 43f644844b83..6ad6416f2ede 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -226,7 +226,7 @@  int drm_mode_getencoder(struct drm_device *dev, void *data,
 
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 	crtc = drm_encoder_get_crtc(encoder);
-	if (crtc)
+	if (crtc && drm_lease_held(file_priv, crtc->base.id))
 		enc_resp->crtc_id = crtc->base.id;
 	else
 		enc_resp->crtc_id = 0;
@@ -234,8 +234,10 @@  int drm_mode_getencoder(struct drm_device *dev, void *data,
 
 	enc_resp->encoder_type = encoder->encoder_type;
 	enc_resp->encoder_id = encoder->base.id;
-	enc_resp->possible_crtcs = encoder->possible_crtcs;
-	enc_resp->possible_clones = encoder->possible_clones;
+	enc_resp->possible_crtcs = drm_lease_filter_crtcs(file_priv,
+							  encoder->possible_crtcs);
+	enc_resp->possible_clones = drm_lease_filter_encoders(file_priv,
+							      encoder->possible_clones);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c
index d9862259a2a7..f7ceee2ae340 100644
--- a/drivers/gpu/drm/drm_mode_config.c
+++ b/drivers/gpu/drm/drm_mode_config.c
@@ -122,20 +122,24 @@  int drm_mode_getresources(struct drm_device *dev, void *data,
 	count = 0;
 	crtc_id = u64_to_user_ptr(card_res->crtc_id_ptr);
 	drm_for_each_crtc(crtc, dev) {
-		if (count < card_res->count_crtcs &&
-		    put_user(crtc->base.id, crtc_id + count))
-			return -EFAULT;
-		count++;
+		if (drm_lease_held(file_priv, crtc->base.id)) {
+			if (count < card_res->count_crtcs &&
+			    put_user(crtc->base.id, crtc_id + count))
+				return -EFAULT;
+			count++;
+		}
 	}
 	card_res->count_crtcs = count;
 
 	count = 0;
 	encoder_id = u64_to_user_ptr(card_res->encoder_id_ptr);
 	drm_for_each_encoder(encoder, dev) {
-		if (count < card_res->count_encoders &&
-		    put_user(encoder->base.id, encoder_id + count))
-			return -EFAULT;
-		count++;
+		if (drm_lease_held(file_priv, encoder->base.id)) {
+			if (count < card_res->count_encoders &&
+			    put_user(encoder->base.id, encoder_id + count))
+				return -EFAULT;
+			count++;
+		}
 	}
 	card_res->count_encoders = count;
 
@@ -143,12 +147,14 @@  int drm_mode_getresources(struct drm_device *dev, void *data,
 	count = 0;
 	connector_id = u64_to_user_ptr(card_res->connector_id_ptr);
 	drm_for_each_connector_iter(connector, &conn_iter) {
-		if (count < card_res->count_connectors &&
-		    put_user(connector->base.id, connector_id + count)) {
-			drm_connector_list_iter_end(&conn_iter);
-			return -EFAULT;
+		if (drm_lease_held(file_priv, connector->base.id)) {
+			if (count < card_res->count_connectors &&
+			    put_user(connector->base.id, connector_id + count)) {
+				drm_connector_list_iter_end(&conn_iter);
+				return -EFAULT;
+			}
+			count++;
 		}
-		count++;
 	}
 	card_res->count_connectors = count;
 	drm_connector_list_iter_end(&conn_iter);
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
index ccc3a35d2de2..dbc280ddef9b 100644
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -104,6 +104,25 @@  void drm_mode_object_unregister(struct drm_device *dev,
 	mutex_unlock(&dev->mode_config.idr_mutex);
 }
 
+/**
+ * drm_lease_required - check types which must be leased to be used
+ * @type: type of object
+ *
+ * Returns whether the provided type of drm_mode_object must
+ * be owned or leased to be used by a process.
+ */
+static bool drm_lease_required(uint32_t type)
+{
+	switch(type) {
+	case DRM_MODE_OBJECT_CRTC:
+	case DRM_MODE_OBJECT_CONNECTOR:
+	case DRM_MODE_OBJECT_ENCODER:
+		return true;
+	default:
+		return false;
+	}
+}
+
 struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
 					       struct drm_file *file_priv,
 					       uint32_t id, uint32_t type)
@@ -117,6 +136,9 @@  struct drm_mode_object *__drm_mode_object_find(struct drm_device *dev,
 	if (obj && obj->id != id)
 		obj = NULL;
 
+	if (obj && drm_lease_required(obj->type) && !_drm_lease_held(file_priv, obj->id))
+		obj = NULL;
+
 	if (obj && obj->free_cb) {
 		if (!kref_get_unless_zero(&obj->refcount))
 			obj = NULL;
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 462c244498e2..9a7306a912b6 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -400,9 +400,9 @@  int drm_mode_getplane(struct drm_device *dev, void *data,
 		return -ENOENT;
 
 	drm_modeset_lock(&plane->mutex, NULL);
-	if (plane->state && plane->state->crtc)
+	if (plane->state && plane->state->crtc && drm_lease_held(file_priv, plane->state->crtc->base.id))
 		plane_resp->crtc_id = plane->state->crtc->base.id;
-	else if (!plane->state && plane->crtc)
+	else if (!plane->state && plane->crtc && drm_lease_held(file_priv, plane->crtc->base.id))
 		plane_resp->crtc_id = plane->crtc->base.id;
 	else
 		plane_resp->crtc_id = 0;
@@ -416,7 +416,9 @@  int drm_mode_getplane(struct drm_device *dev, void *data,
 	drm_modeset_unlock(&plane->mutex);
 
 	plane_resp->plane_id = plane->base.id;
-	plane_resp->possible_crtcs = plane->possible_crtcs;
+	plane_resp->possible_crtcs = drm_lease_filter_crtcs(file_priv,
+							    plane->possible_crtcs);
+
 	plane_resp->gamma_size = 0;
 
 	/*
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index 70f2b9593edc..47d5cfa0c167 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -1401,9 +1401,11 @@  static bool drm_wait_vblank_is_query(union drm_wait_vblank *vblwait)
 int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
 			  struct drm_file *file_priv)
 {
+	struct drm_crtc *crtc;
 	struct drm_vblank_crtc *vblank;
 	union drm_wait_vblank *vblwait = data;
 	int ret;
+	unsigned int pipe_index;
 	unsigned int flags, seq, pipe, high_pipe;
 
 	if (!dev->irq_enabled)
@@ -1425,9 +1427,21 @@  int drm_wait_vblank_ioctl(struct drm_device *dev, void *data,
 	flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK;
 	high_pipe = (vblwait->request.type & _DRM_VBLANK_HIGH_CRTC_MASK);
 	if (high_pipe)
-		pipe = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
+		pipe_index = high_pipe >> _DRM_VBLANK_HIGH_CRTC_SHIFT;
 	else
-		pipe = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
+		pipe_index = flags & _DRM_VBLANK_SECONDARY ? 1 : 0;
+
+	/* Convert lease-relative crtc index into global crtc index */
+	pipe = 0;
+	drm_for_each_crtc(crtc, dev) {
+		if (drm_lease_held(file_priv, crtc->base.id)) {
+			if (pipe_index == 0)
+				break;
+			pipe_index--;
+		}
+		pipe++;
+	}
+
 	if (pipe >= dev->num_crtcs)
 		return -EINVAL;