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authorThomas Hellstrom <thellstrom@vmware.com>2015-12-02 09:24:46 -0800
committerDave Airlie <airlied@redhat.com>2015-12-04 12:28:14 +1000
commita0af2e538c80f3e47f1d6ddf120a153ad909e8ad (patch)
tree056678eb2ff49c0d8e489f34995d7089e5b134bb /drivers/gpu
parentf46e699cb6f44e79f3df33966c239ab1f4da5778 (diff)
downloadlinux-a0af2e538c80f3e47f1d6ddf120a153ad909e8ad.tar.bz2
drm: Fix an unwanted master inheritance v2
A client calling drmSetMaster() using a file descriptor that was opened when another client was master would inherit the latter client's master object and all its authenticated clients. This is unwanted behaviour, and when this happens, instead allocate a brand new master object for the client calling drmSetMaster(). Fixes a BUG() throw in vmw_master_set(). Cc: <stable@vger.kernel.org> Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/drm_drv.c5
-rw-r--r--drivers/gpu/drm/drm_fops.c84
2 files changed, 61 insertions, 28 deletions
diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 9362609df38a..7dd6728dd092 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -160,6 +160,11 @@ int drm_setmaster_ioctl(struct drm_device *dev, void *data,
goto out_unlock;
}
+ if (!file_priv->allowed_master) {
+ ret = drm_new_set_master(dev, file_priv);
+ goto out_unlock;
+ }
+
file_priv->minor->master = drm_master_get(file_priv->master);
file_priv->is_master = 1;
if (dev->driver->master_set) {
diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index c59ce4d0ef75..6b5625e66119 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -126,6 +126,60 @@ static int drm_cpu_valid(void)
}
/**
+ * drm_new_set_master - Allocate a new master object and become master for the
+ * associated master realm.
+ *
+ * @dev: The associated device.
+ * @fpriv: File private identifying the client.
+ *
+ * This function must be called with dev::struct_mutex held.
+ * Returns negative error code on failure. Zero on success.
+ */
+int drm_new_set_master(struct drm_device *dev, struct drm_file *fpriv)
+{
+ struct drm_master *old_master;
+ int ret;
+
+ lockdep_assert_held_once(&dev->master_mutex);
+
+ /* create a new master */
+ fpriv->minor->master = drm_master_create(fpriv->minor);
+ if (!fpriv->minor->master)
+ return -ENOMEM;
+
+ /* take another reference for the copy in the local file priv */
+ old_master = fpriv->master;
+ fpriv->master = drm_master_get(fpriv->minor->master);
+
+ if (dev->driver->master_create) {
+ ret = dev->driver->master_create(dev, fpriv->master);
+ if (ret)
+ goto out_err;
+ }
+ if (dev->driver->master_set) {
+ ret = dev->driver->master_set(dev, fpriv, true);
+ if (ret)
+ goto out_err;
+ }
+
+ fpriv->is_master = 1;
+ fpriv->allowed_master = 1;
+ fpriv->authenticated = 1;
+ if (old_master)
+ drm_master_put(&old_master);
+
+ return 0;
+
+out_err:
+ /* drop both references and restore old master on failure */
+ drm_master_put(&fpriv->minor->master);
+ drm_master_put(&fpriv->master);
+ fpriv->master = old_master;
+
+ return ret;
+}
+
+/**
* Called whenever a process opens /dev/drm.
*
* \param filp file pointer.
@@ -189,35 +243,9 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
mutex_lock(&dev->master_mutex);
if (drm_is_primary_client(priv) && !priv->minor->master) {
/* create a new master */
- priv->minor->master = drm_master_create(priv->minor);
- if (!priv->minor->master) {
- ret = -ENOMEM;
+ ret = drm_new_set_master(dev, priv);
+ if (ret)
goto out_close;
- }
-
- priv->is_master = 1;
- /* take another reference for the copy in the local file priv */
- priv->master = drm_master_get(priv->minor->master);
- priv->authenticated = 1;
-
- if (dev->driver->master_create) {
- ret = dev->driver->master_create(dev, priv->master);
- if (ret) {
- /* drop both references if this fails */
- drm_master_put(&priv->minor->master);
- drm_master_put(&priv->master);
- goto out_close;
- }
- }
- if (dev->driver->master_set) {
- ret = dev->driver->master_set(dev, priv, true);
- if (ret) {
- /* drop both references if this fails */
- drm_master_put(&priv->minor->master);
- drm_master_put(&priv->master);
- goto out_close;
- }
- }
} else if (drm_is_primary_client(priv)) {
/* get a reference to the master */
priv->master = drm_master_get(priv->minor->master);