userns: Convert drm to use kuid and kgid and struct pid where appropriate

Blink Blink this had not been converted to use struct pid ages ago?

- On drm open capture the openers kuid and struct pid.
- On drm close release the kuid and struct pid
- When reporting the uid and pid convert the kuid and struct pid
  into values in the appropriate namespace.

Cc: dri-devel@lists.freedesktop.org
Acked-by: Dave Airlie <airlied@redhat.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

3 files changed, 7 insertions, 5 deletions

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index 5062eec..433d2fa 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -251,7 +251,7 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
 	filp->private_data = priv;
 	priv->filp = filp;
 	priv->uid = current_euid();
-	priv->pid = task_pid_nr(current);
+	priv->pid = get_pid(task_pid(current));
 	priv->minor = idr_find(&drm_minors_idr, minor_id);
 	priv->ioctl_count = 0;
 	/* for compatibility root is always authenticated */
@@ -524,6 +524,7 @@ int drm_release(struct inode *inode, struct file *filp)
 	if (drm_core_check_feature(dev, DRIVER_PRIME))
 		drm_prime_destroy_file_private(&file_priv->prime);
 
+	put_pid(file_priv->pid);
 	kfree(file_priv);
 
 	/* ========================================================
diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c
index 8928edb..eb0af39 100644
--- a/drivers/gpu/drm/drm_info.c
+++ b/drivers/gpu/drm/drm_info.c
@@ -191,8 +191,9 @@ int drm_clients_info(struct seq_file *m, void *data)
 		seq_printf(m, "%c %3d %5d %5d %10u %10lu\n",
 			   priv->authenticated ? 'y' : 'n',
 			   priv->minor->index,
-			   priv->pid,
-			   priv->uid, priv->magic, priv->ioctl_count);
+			   pid_vnr(priv->pid),
+			   from_kuid_munged(seq_user_ns(m), priv->uid),
+			   priv->magic, priv->ioctl_count);
 	}
 	mutex_unlock(&dev->struct_mutex);
 	return 0;
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 64a62c6..39a4383 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -215,8 +215,8 @@ int drm_getclient(struct drm_device *dev, void *data,
 	list_for_each_entry(pt, &dev->filelist, lhead) {
 		if (i++ >= idx) {
 			client->auth = pt->authenticated;
-			client->pid = pt->pid;
-			client->uid = pt->uid;
+			client->pid = pid_vnr(pt->pid);
+			client->uid = from_kuid_munged(current_user_ns(), pt->uid);
 			client->magic = pt->magic;
 			client->iocs = pt->ioctl_count;
 			mutex_unlock(&dev->struct_mutex);