DivestOS/Patches/LineageOS-14.1/android_frameworks_base/364029-backport.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jing Ji <jji@google.com>
Date: Tue, 25 Oct 2022 22:39:52 -0700
Subject: [PATCH] DO NOT MERGE: ActivityManager#killBackgroundProcesses can
kill caller's own app only
unless it's a system app.
Bug: 239423414
Bug: 223376078
Test: atest CtsAppTestCases:ActivityManagerTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:8b382775b258220466a977453905797521e159de)
Merged-In: Iac6baa889965b8ffecd9a43179a4c96632ad1d02
Change-Id: Iac6baa889965b8ffecd9a43179a4c96632ad1d02
---
core/java/android/app/ActivityManager.java | 3 ++
core/res/AndroidManifest.xml | 6 +++-
.../server/am/ActivityManagerService.java | 32 +++++++++++++++++--
3 files changed, 38 insertions(+), 3 deletions(-)
diff --git a/core/java/android/app/ActivityManager.java b/core/java/android/app/ActivityManager.java
index da7d711194de..9f6e25c74386 100644
--- a/core/java/android/app/ActivityManager.java
+++ b/core/java/android/app/ActivityManager.java
@@ -3160,6 +3160,9 @@ public class ActivityManager {
* processes to reclaim memory; the system will take care of restarting
* these processes in the future as needed.
*
+ * <p class="note">Third party applications can only use this API to kill their own processes.
+ * </p>
+ *
* <p>You must hold the permission
* {@link android.Manifest.permission#KILL_BACKGROUND_PROCESSES} to be able to
* call this method.
diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 0f224dae3337..ef6ce2503061 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1741,7 +1741,11 @@
android:protectionLevel="normal" />
<!-- Allows an application to call
- {@link android.app.ActivityManager#killBackgroundProcesses}.
+ {@link android.app.ActivityManager#killBackgroundProcesses}.
+
+ <p class="note">Third party applications can only use this API to kill their own
+ processes.</p>
+
<p>Protection level: normal
-->
<permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index 8f26804d51bd..a96ad5e24399 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -5819,8 +5819,20 @@ public final class ActivityManagerService extends ActivityManagerNative
Slog.w(TAG, msg);
throw new SecurityException(msg);
}
+ final int callingUid = Binder.getCallingUid();
+ final int callingPid = Binder.getCallingPid();
+ final int callingAppId = UserHandle.getAppId(callingUid);
- userId = mUserController.handleIncomingUser(Binder.getCallingPid(), Binder.getCallingUid(),
+ ProcessRecord proc;
+ synchronized (mPidsSelfLocked) {
+ proc = mPidsSelfLocked.get(callingPid);
+ }
+ final boolean hasKillAllPermission = PERMISSION_GRANTED == checkPermission(
+ android.Manifest.permission.FORCE_STOP_PACKAGES, callingPid, callingUid)
+ || (UserHandle.getAppId(callingUid) > 0 && UserHandle.getAppId(callingUid) < Process.FIRST_APPLICATION_UID)
+ || (proc != null && proc.info.isSystemApp());
+
+ userId = mUserController.handleIncomingUser(callingPid, callingUid,
userId, true, ALLOW_FULL_ONLY, "killBackgroundProcesses", null);
long callingId = Binder.clearCallingIdentity();
try {
@@ -5832,7 +5844,7 @@ public final class ActivityManagerService extends ActivityManagerNative
pm.getPackageUid(packageName, MATCH_DEBUG_TRIAGED_MISSING, userId));
} catch (RemoteException e) {
}
- if (appId == -1) {
+ if (appId == -1 || (!hasKillAllPermission && appId != callingAppId)) {
Slog.w(TAG, "Invalid packageName: " + packageName);
return;
}
@@ -5912,6 +5924,22 @@ public final class ActivityManagerService extends ActivityManagerNative
throw new SecurityException(msg);
}
+ final int callingUid = Binder.getCallingUid();
+ final int callingPid = Binder.getCallingPid();
+
+ ProcessRecord proc;
+ synchronized (mPidsSelfLocked) {
+ proc = mPidsSelfLocked.get(callingPid);
+ }
+ if (callingUid >= Process.FIRST_APPLICATION_UID
+ && (proc == null || !proc.info.isSystemApp())) {
+ final String msg = "Permission Denial: killAllBackgroundProcesses() from pid="
+ + callingPid + ", uid=" + callingUid + " is not allowed";
+ Slog.w(TAG, msg);
+ // Silently return to avoid existing apps from crashing.
+ return;
+ }
+
final long callingId = Binder.clearCallingIdentity();
try {
synchronized (this) {