DO NOT MERGE. Grant MMS Uri permissions as the calling UID.

A recent security fix prevents the system UID from handing out Uri
permission grants directly from itself.  Instead, services need to
issue grants as the original calling UID to ensure that the caller
actually has access to the Uris.

Test: builds, boots, send/recv MMS works in primary/secondary users
Bug: 33231106
Change-Id: Ia9fe19843b52977c8a94ee5349b907beda1882fc
(cherry picked from commit 7ff418d9a9afb9ecf42f87fffd3e65477decb55e)

diff --git a/core/java/android/app/ActivityManagerInternal.java b/core/java/android/app/ActivityManagerInternal.java
index 44b564c..da856ae 100644 (file)
--- a/core/java/android/app/ActivityManagerInternal.java
+++ b/core/java/android/app/ActivityManagerInternal.java
@@ -16,6 +16,8 @@
 
 package android.app;
 
+import android.content.Intent;
+
 /**
  * Activity manager local system service interface.
  *
@@ -23,6 +25,13 @@ package android.app;
  */
 public abstract class ActivityManagerInternal {
     /**
+     * Grant Uri permissions from one app to another. This method only extends
+     * permission grants if {@code callingUid} has permission to them.
+     */
+    public abstract void grantUriPermissionFromIntent(int callingUid, String targetPkg,
+            Intent intent, int targetUserId);
+
+    /**
      * Verify that calling app has access to the given provider.
      */
     public abstract String checkContentProviderAccess(String authority, int userId);

diff --git a/services/core/java/com/android/server/MmsServiceBroker.java b/services/core/java/com/android/server/MmsServiceBroker.java
index 0de6a03..469065c 100644 (file)
--- a/services/core/java/com/android/server/MmsServiceBroker.java
+++ b/services/core/java/com/android/server/MmsServiceBroker.java
@@ -17,6 +17,7 @@
 package com.android.server;
 
 import android.Manifest;
+import android.app.ActivityManagerInternal;
 import android.app.AppOpsManager;
 import android.app.PendingIntent;
 import android.content.ComponentName;
@@ -397,13 +398,21 @@ public class MmsServiceBroker extends SystemService {
          */
         private Uri adjustUriForUserAndGrantPermission(Uri contentUri, String action,
                 int permission) {
+            final Intent grantIntent = new Intent();
+            grantIntent.setData(contentUri);
+            grantIntent.setFlags(permission);
+
+            final int callingUid = Binder.getCallingUid();
             final int callingUserId = UserHandle.getCallingUserId();
             if (callingUserId != UserHandle.USER_OWNER) {
                 contentUri = ContentProvider.maybeAddUserId(contentUri, callingUserId);
             }
+
             long token = Binder.clearCallingIdentity();
             try {
-                mContext.grantUriPermission(PHONE_PACKAGE_NAME, contentUri, permission);
+                LocalServices.getService(ActivityManagerInternal.class)
+                        .grantUriPermissionFromIntent(callingUid, PHONE_PACKAGE_NAME,
+                                grantIntent, UserHandle.USER_OWNER);
 
                 // Grant permission for the carrier app.
                 Intent intent = new Intent(action);
@@ -412,7 +421,9 @@ public class MmsServiceBroker extends SystemService {
                 List<String> carrierPackages = telephonyManager.getCarrierPackageNamesForIntent(
                         intent);
                 if (carrierPackages != null && carrierPackages.size() == 1) {
-                    mContext.grantUriPermission(carrierPackages.get(0), contentUri, permission);
+                    LocalServices.getService(ActivityManagerInternal.class)
+                            .grantUriPermissionFromIntent(callingUid, carrierPackages.get(0),
+                                    grantIntent, UserHandle.USER_OWNER);
                 }
             } finally {
                 Binder.restoreCallingIdentity(token);

diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 6bb1ebf..d608f47 100755 (executable)
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -19704,6 +19704,15 @@ public final class ActivityManagerService extends ActivityManagerNative
 
     private final class LocalService extends ActivityManagerInternal {
         @Override
+        public void grantUriPermissionFromIntent(int callingUid, String targetPkg, Intent intent,
+                int targetUserId) {
+            synchronized (ActivityManagerService.this) {
+                ActivityManagerService.this.grantUriPermissionFromIntentLocked(callingUid,
+                        targetPkg, intent, null, targetUserId);
+            }
+        }
+
+        @Override
         public String checkContentProviderAccess(String authority, int userId) {
             return ActivityManagerService.this.checkContentProviderAccess(authority, userId);
         }