Fix issue #2834005: Android Settings.Secure bypass

Change-Id: Ic4f14e2ff5c2b4f623405d30389863a9e3e82572

2 files changed, 28 insertions, 0 deletions

diff --git a/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java b/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
index 2b4714d..dab7601 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
@@ -49,6 +49,7 @@ import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException;
 
 import java.io.IOException;
+import java.util.HashSet;
 import java.util.List;
 
 /**
@@ -67,11 +68,29 @@ public class DatabaseHelper extends SQLiteOpenHelper {
 
     private Context mContext;
 
+    private static final HashSet<String> mValidTables = new HashSet<String>();
+
+    static {
+        mValidTables.add("system");
+        mValidTables.add("secure");
+        mValidTables.add("bluetooth_devices");
+        mValidTables.add("bookmarks");
+
+        // These are old.
+        mValidTables.add("favorites");
+        mValidTables.add("gservices");
+        mValidTables.add("old_favorites");
+    }
+
     public DatabaseHelper(Context context) {
         super(context, DATABASE_NAME, null, DATABASE_VERSION);
         mContext = context;
     }
 
+    public static boolean isValidTable(String name) {
+        return mValidTables.contains(name);
+    }
+
     private void createSecureTable(SQLiteDatabase db) {
         db.execSQL("CREATE TABLE secure (" +
                 "_id INTEGER PRIMARY KEY AUTOINCREMENT," +
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
index 1b4ba81..4372cd8 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProvider.java
@@ -83,6 +83,9 @@ public class SettingsProvider extends ContentProvider {
         SqlArguments(Uri url, String where, String[] args) {
             if (url.getPathSegments().size() == 1) {
                 this.table = url.getPathSegments().get(0);
+                if (!DatabaseHelper.isValidTable(this.table)) {
+                    throw new IllegalArgumentException("Bad root path: " + this.table);
+                }
                 this.where = where;
                 this.args = args;
             } else if (url.getPathSegments().size() != 2) {
@@ -91,6 +94,9 @@ public class SettingsProvider extends ContentProvider {
                 throw new UnsupportedOperationException("WHERE clause not supported: " + url);
             } else {
                 this.table = url.getPathSegments().get(0);
+                if (!DatabaseHelper.isValidTable(this.table)) {
+                    throw new IllegalArgumentException("Bad root path: " + this.table);
+                }
                 if ("system".equals(this.table) || "secure".equals(this.table)) {
                     this.where = Settings.NameValueTable.NAME + "=?";
                     this.args = new String[] { url.getPathSegments().get(1) };
@@ -105,6 +111,9 @@ public class SettingsProvider extends ContentProvider {
         SqlArguments(Uri url) {
             if (url.getPathSegments().size() == 1) {
                 this.table = url.getPathSegments().get(0);
+                if (!DatabaseHelper.isValidTable(this.table)) {
+                    throw new IllegalArgumentException("Bad root path: " + this.table);
+                }
                 this.where = null;
                 this.args = null;
             } else {