mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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86 lines
4.3 KiB
Diff
86 lines
4.3 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Edgar Wang <edgarwang@google.com>
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Date: Thu, 6 Jan 2022 20:53:48 +0800
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Subject: [PATCH] Fix bypass CALL_PRIVILEGED permission in
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AppRestrictionsFragment
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In onReceive of AppRestrictionsFragment.java, there is a possible way to
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start a phone call without permissions due to a confused deputy.
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This could lead to local escalation of privilege with no additional
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execution privileges needed.
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We should not allow the restrictionsIntent to startActivity simply
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because it resolves to multiple activities.
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Instead, we should call resolveActivity and check the result's package
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name is same as current package name, then it is safe to startActivity.
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Bug: 200688991
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Test: manual verify
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Change-Id: Iaa2d3a9497c3266babe0789961befc9776a4db7a
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Merged-In: Iaa2d3a9497c3266babe0789961befc9776a4db7a
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(cherry picked from commit 359512cd9553c940af3c9045b856647b7529731a)
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(cherry picked from commit f57d75f127fe96e91250585208a339763f1a2253)
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Merged-In: Iaa2d3a9497c3266babe0789961befc9776a4db7a
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---
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.../users/AppRestrictionsFragment.java | 24 +++++++++++++------
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1 file changed, 17 insertions(+), 7 deletions(-)
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diff --git a/src/com/android/settings/users/AppRestrictionsFragment.java b/src/com/android/settings/users/AppRestrictionsFragment.java
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index d487c70c66..10d714401e 100644
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--- a/src/com/android/settings/users/AppRestrictionsFragment.java
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+++ b/src/com/android/settings/users/AppRestrictionsFragment.java
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@@ -17,6 +17,7 @@
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package com.android.settings.users;
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import android.app.Activity;
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+import android.content.ActivityNotFoundException;
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import android.content.BroadcastReceiver;
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import android.content.Context;
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import android.content.Intent;
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@@ -44,6 +45,7 @@ import android.support.v7.preference.Preference.OnPreferenceChangeListener;
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import android.support.v7.preference.Preference.OnPreferenceClickListener;
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import android.support.v7.preference.PreferenceGroup;
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import android.support.v7.preference.PreferenceViewHolder;
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+import android.util.EventLog;
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import android.util.Log;
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import android.view.View;
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import android.view.View.OnClickListener;
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@@ -634,7 +636,15 @@ public class AppRestrictionsFragment extends SettingsPreferenceFragment implemen
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} else if (restrictionsIntent != null) {
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preference.setRestrictions(restrictions);
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if (invokeIfCustom && AppRestrictionsFragment.this.isResumed()) {
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- assertSafeToStartCustomActivity(restrictionsIntent);
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+ try {
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+ assertSafeToStartCustomActivity(restrictionsIntent);
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+ } catch (ActivityNotFoundException | SecurityException e) {
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+ // return without startActivity
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+ Log.e(TAG, "Cannot start restrictionsIntent " + e);
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+ EventLog.writeEvent(0x534e4554, "200688991", -1 /* UID */, "");
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+ return;
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+ }
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+
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int requestCode = generateCustomActivityRequestCode(
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RestrictionsResultReceiver.this.preference);
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AppRestrictionsFragment.this.startActivityForResult(
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@@ -648,14 +658,14 @@ public class AppRestrictionsFragment extends SettingsPreferenceFragment implemen
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if (intent.getPackage() != null && intent.getPackage().equals(packageName)) {
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return;
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}
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- // Activity can be started if intent resolves to multiple activities
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- List<ResolveInfo> resolveInfos = AppRestrictionsFragment.this.mPackageManager
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- .queryIntentActivities(intent, 0 /* no flags */);
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- if (resolveInfos.size() != 1) {
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- return;
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+ ResolveInfo resolveInfo = mPackageManager.resolveActivity(
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+ intent, PackageManager.MATCH_DEFAULT_ONLY);
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+
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+ if (resolveInfo == null) {
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+ throw new ActivityNotFoundException("No result for resolving " + intent);
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}
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// Prevent potential privilege escalation
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- ActivityInfo activityInfo = resolveInfos.get(0).activityInfo;
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+ ActivityInfo activityInfo = resolveInfo.activityInfo;
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if (!packageName.equals(activityInfo.packageName)) {
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throw new SecurityException("Application " + packageName
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+ " is not allowed to start activity " + intent);
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