Merge "Camera: Clear identity before access device policy manager" into main am: 6cc598239e

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2652179

Change-Id: I3784e485d5b11068d167e76b1e96e168157b7b17
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

services/core/java/com/android/server/camera/CameraServiceProxy.java

@@ -595,16 +595,26 @@ public class CameraServiceProxy extends SystemService
 
         @Override
         public boolean isCameraDisabled(int userId) {
-            DevicePolicyManager dpm = mContext.getSystemService(DevicePolicyManager.class);
-            if (dpm == null) {
-                Slog.e(TAG, "Failed to get the device policy manager service");
+            if (Binder.getCallingUid() != Process.CAMERASERVER_UID) {
+                Slog.e(TAG, "Calling UID: " + Binder.getCallingUid()
+                        + " doesn't match expected camera service UID!");
                 return false;
             }
+            final long ident = Binder.clearCallingIdentity();
             try {
-                return dpm.getCameraDisabled(null, userId);
-            } catch (Exception e) {
-                e.printStackTrace();
-                return false;
+                DevicePolicyManager dpm = mContext.getSystemService(DevicePolicyManager.class);
+                if (dpm == null) {
+                    Slog.e(TAG, "Failed to get the device policy manager service");
+                    return false;
+                }
+                try {
+                    return dpm.getCameraDisabled(null, userId);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                    return false;
+                }
+            } finally {
+                Binder.restoreCallingIdentity(ident);
             }
         }
     };