commit fe9a53bc45fd0124a876dc0a49680aaf86641d3e
author Jeff Sharkey <jsharkey@android.com> Fri Mar 31 14:08:23 2017 -0600
committer Jeff Sharkey <jsharkey@android.com> Sun Apr 02 22:29:07 2017 -0600
tree 56d1ea4b6f0fe98fa628a72f197cefa0fbabcb22
parent 21a5edcc24cbca1ae3f0855d71737b22ab81ad6d

Consistent dump() permission checking.

This change introduces new methods on DumpUtils that can check if the
caller has DUMP and/or PACKAGE_USAGE_STATS access.  It then moves all
existing dump() methods to use these checks so that we emit
consistent error messages.

Test: cts-tradefed run commandAndExit cts-dev -m CtsSecurityTestCases -t android.security.cts.ServicePermissionsTest
Bug: 32806790
Change-Id: Iaff6b9506818ee082b1e169c89ebe1001b3bfeca

services/core/java/com/android/server/media/MediaSessionService.java

diff --git a/services/core/java/com/android/server/media/MediaSessionService.java b/services/core/java/com/android/server/media/MediaSessionService.java
index 4bf9d8f..64ab848 100644
--- a/services/core/java/com/android/server/media/MediaSessionService.java
+++ b/services/core/java/com/android/server/media/MediaSessionService.java
@@ -71,6 +71,7 @@
 import android.view.KeyEvent;
 import android.view.ViewConfiguration;
 
+import com.android.internal.util.DumpUtils;
 import com.android.server.LocalServices;
 import com.android.server.SystemService;
 import com.android.server.Watchdog;
@@ -1283,13 +1284,7 @@
 
         @Override
         public void dump(FileDescriptor fd, final PrintWriter pw, String[] args) {
-            if (getContext().checkCallingOrSelfPermission(Manifest.permission.DUMP)
-                    != PackageManager.PERMISSION_GRANTED) {
-                pw.println("Permission Denial: can't dump MediaSessionService from from pid="
-                        + Binder.getCallingPid()
-                        + ", uid=" + Binder.getCallingUid());
-                return;
-            }
+            if (!DumpUtils.checkDumpPermission(getContext(), TAG, pw)) return;
 
             pw.println("MEDIA SESSION SERVICE (dumpsys media_session)");
             pw.println();