From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Oli Lan <olilan@google.com>
Date: Fri, 25 Mar 2022 10:02:41 +0000
Subject: [PATCH] RESTRICT AUTOMERGE Prevent non-admin users from deleting
 system apps.

This addresses a security issue where the guest user can remove updates
for system apps.

With this CL, attempts to uninstall/downgrade system apps will fail if
attempted by a non-admin user.

This is a backport of ag/17352264.

Bug: 170646036
Test: manual, try uninstalling system app update as guest
Change-Id: I5bbaaf83d035c500bfc02ff4b9b0e7fb1e7c2feb
Merged-In: I4e959e296cca9bbdfc8fccc5e5e0e654ca524165
(cherry picked from commit a7621e0ce00f1d140b375518e26cf75693314203)
Merged-In: I5bbaaf83d035c500bfc02ff4b9b0e7fb1e7c2feb
---
 .../com/android/server/pm/PackageManagerService.java   | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/services/core/java/com/android/server/pm/PackageManagerService.java b/services/core/java/com/android/server/pm/PackageManagerService.java
index c0845d07d753..235e7d19d8f1 100644
--- a/services/core/java/com/android/server/pm/PackageManagerService.java
+++ b/services/core/java/com/android/server/pm/PackageManagerService.java
@@ -19837,6 +19837,16 @@ public class PackageManagerService extends IPackageManager.Stub
                 return PackageManager.DELETE_FAILED_INTERNAL_ERROR;
             }
 
+            if (isSystemApp(uninstalledPs)) {
+                UserInfo userInfo = sUserManager.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;
+                }
+            }
+
             // Static shared libs can be declared by any package, so let us not
             // allow removing a package if it provides a lib others depend on.
             pkg = mPackages.get(packageName);
