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 5062eec673f1..433d2fad1fe6 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 8928edbb94c7..eb0af393e6e2 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 64a62c697313..39a43834cef9 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);