Merge "Prevent non-admin users from deleting system apps." into rvc-dev am: 71fad59e5e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19570390

Change-Id: I2bbb9bdd9f662be36a205565450282429fb58c82
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

services/core/java/com/android/server/pm/PackageManagerService.java

@@ -18568,6 +18568,17 @@ public class PackageManagerService extends IPackageManager.Stub
                 return PackageManager.DELETE_FAILED_INTERNAL_ERROR;
             }
 
+            if (isSystemApp(uninstalledPs)
+                    && (deleteFlags & PackageManager.DELETE_SYSTEM_APP) == 0) {
+                UserInfo userInfo = mUserManager.getUserInfo(userId);
+                if (userInfo == null || !userInfo.isAdmin()) {
+                    Slog.w(TAG, "Not removing package " + packageName
+                            + " as only admin user may downgrade system apps");
+                    EventLog.writeEvent(0x534e4554, "170646036", -1, packageName);
+                    return PackageManager.DELETE_FAILED_USER_RESTRICTED;
+                }
+            }
+
             disabledSystemPs = mSettings.getDisabledSystemPkgLPr(packageName);
             // Save the enabled state before we delete the package. When deleting a stub
             // application we always set the enabled state to 'disabled'.